Apparatus for detecting position of object, integrated circuit, and method for using same

Abstract

The invention provides a device for detecting the position of an object, an integrated circuit, and a method for using the same. An apparatus for detecting a position of an object includes: a plurality of drive electrodes; a plurality of detection electrodes; a first drive wiring facing one end of the plurality of drive electrodes; a first reference wiring facing the other end of the plurality of drive electrodes; and a switching control circuit that, when detecting the approach of the outside of the object, connects one end of an (n + 1)-th first drive electrode to the first drive wiring and the other end to the first reference wiring at a first timing, and connects the other end of the (n + 1)-th first drive electrode to the second reference wiring at a second timing, and connects the other end of the (n + 1)-th first drive electrode to the second reference wiring at a third timing. At a second timing following the first timing, one end portion of an (n + 2)-th second drive electrode adjacent to the (n + 1)-th first drive electrode is connected to the first drive wiring, and the other end portion is connected to the first reference wiring, and n is a natural number.

Description

[0001] This application is a divisional application of the patent application No. 202110454230.5 with a title of "Display device" and a filing date of March 9, 2017, which is a divisional application of the patent application No. 201710140517.4 with a title of "Display device" and a filing date of March 9, 2017, which is a divisional application of the patent application No. 201710140517.4 with a title of "Display device" and a filing date of March 9, 2017. TECHNICAL FIELD

[0002] The present application relates to a display device, and particularly relates to a display device with a touch detection function capable of detecting an external approaching object. BACKGROUND

[0003] In recent years, a touch detection device capable of detecting an external approaching object, which is called a so-called touch panel, has been attracting attention. The touch panel is provided in combination with a display device, for example, a liquid crystal display device, or integrated into the liquid crystal display device, as a display device with a touch detection function.

[0004] There is a touch panel capable of using a pen as an external approaching object. By being capable of using a pen, it is possible to perform input such as designating a small area or handwriting. There are various technologies for detecting a pen touch. As one of the various technologies, there is an electromagnetic induction method. The electromagnetic induction method is dominant as a technology for detecting a pen touch because it is capable of achieving high precision, high pen pressure detection precision, and also capable of achieving a hovering detection function after the external approaching object is separated from the surface of the touch panel.

[0005] In addition, there is a touch panel capable of using a finger as an external approaching object. By being capable of using a finger, it is not necessary to prepare a pen or the like, and thus it becomes convenient. For example, various button images or the like are displayed on a display device with a touch detection function, and a finger approaching the button image is detected by the touch panel. Thus, it is possible to use the touch panel as a substitute for a conventional mechanical button. Such a display device with a touch detection function has a tendency to be used more widely even in a portable information terminal such as a cellular phone, in addition to a computer, because it does not necessarily require a unit for information input such as a keyboard or a mouse.

[0006] There are various technologies for detecting a finger touch. For example, there are an optical type, a resistive type, and an electrostatic capacity method. Among them, the electrostatic capacity method is used for a portable information terminal or the like because it has a relatively simple configuration and low power consumption.

[0007] The touch panel capable of using a finger, although convenient, is not easy to designate a small area with a finger, for example. Therefore, a touch panel capable of using both a pen and a finger is desired.

[0008] For example, technologies using touch detection of an electromagnetic induction system are described in Patent Documents 1 to 3.

[0009] Prior Art Documents

[0010] Patent Documents

[0011] Patent Document 1: Japanese Patent Application Laid-Open (JP A) No. 10-49301

[0012] Patent Document 2: Japanese Patent Application Laid-Open (JP A) No. 2005-352572

[0013] Patent Document 3: Japanese Patent Application Laid-Open (JP A) No. 2006-163745 SUMMARY

[0014] A display device includes a pixel array having a plurality of pixels arranged in a matrix, a plurality of drive lines arranged to extend in a first direction in the pixel array, respectively, and a plurality of detection lines arranged to extend in a second direction intersecting the first direction in the pixel array, when an external approaching object is detected, in a first drive line among the plurality of drive lines, a magnetic field corresponding to a magnetic field drive signal periodically changing is generated by supplying the magnetic field drive signal to a first region and a reference signal to a second region extending in the first direction with respect to the first region, and a magnetic field generated by the external approaching object is detected by the plurality of detection lines based on the magnetic field generated in the first drive line. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 (A) and (B) of FIG. 1 are explanatory diagrams showing a relationship between an electronic device having a display device with a touch detection function and a pen.

[0016] Figure 2 (A) and (B) of FIG. 2 are explanatory diagrams showing a principle of an electromagnetic induction system.

[0017] Figure 3 (A) and (B) of FIG. 3 are waveform diagrams showing a principle of an electromagnetic induction system.

[0018] Figure 4 (A) and (B) of FIG. 4 are top view and cross-sectional view schematically showing a configuration of a display device according to an embodiment.

[0019] Figure 5 (A) to (C) of FIG. 5 are explanatory diagrams showing a principle of an electrostatic capacity system.

[0020] Figure 6 (A) and (B) of FIG. 6 are cross-sectional views showing a schematic cross section of a display device.

[0021] Figure 7 is a plan view showing a magnetic field generating coil and a magnetic field detecting coil.

[0022] Figure 8 is a block diagram showing the configuration of the display device according to Embodiment 1.

[0023] Figure 9 is a plan view showing the configuration of a module of the display device according to Embodiment 1.

[0024] Figure 10 is a plan view showing the configuration of a display panel of the display device according to Embodiment 1.

[0025] Figure 11 is a sectional view showing the configuration of the display device according to Embodiment 1.

[0026] Figure 12 is a circuit diagram showing the circuit configuration of the display panel of the display device according to Embodiment 1.

[0027] Figure 13 (A) and (B) of FIG. 7 are explanatory diagrams showing the touch detection operation of the display device according to Embodiment 1.

[0028] Figure 14 is a block diagram showing the configuration of a selection drive circuit of the display device according to Embodiment 1.

[0029] Figure 15 (A) to (C) of FIG. 8 are waveform diagrams showing waveforms during the magnetic field generation of the display device according to Embodiment 1.

[0030] Figure 16 is a schematic plan view showing the magnetic field touch detection operation of the display device according to Embodiment 1.

[0031] Figure 17 is a schematic plan view showing the magnetic field touch detection operation of the display device according to Embodiment 1.

[0032] Figure 18 is a schematic plan view showing the electric field touch detection operation of the display device according to Embodiment 1.

[0033] Figure 19 is a schematic plan view showing the configuration of the display device according to Embodiment 1.

[0034] Figure 20 is a schematic perspective view showing the configuration of the display device according to Embodiment 1.

[0035] Figure 21is a perspective view schematically showing a configuration of a display device according to a modification of Embodiment 1.

[0036] Figure 22 is a plan view showing a configuration of a display device according to Embodiment 2.

[0037] Figure 23 is a plan view showing an operation of a display device according to Embodiment 2.

[0038] Figure 24 is a plan view showing an operation of a display device according to Embodiment 2.

[0039] Figure 25 (A) to (I) of FIG. 10 are timing charts showing an operation of a display device according to Embodiment 3.

[0040] Figure 26 (A) to (F) of FIG. 11 are timing charts showing an operation of a display device according to Embodiment 3.

[0041] Figure 27 is a circuit diagram showing a configuration of a detection circuit of a display device according to Embodiment 3.

[0042] Figure 28 is a plan view showing a configuration of a display device according to Embodiment 4.

[0043] Figure 29 is a circuit diagram showing a principle of touch detection in a display device according to Embodiment 4.

[0044] Figure 30 is a plan view showing a configuration of a display device according to a modification of Embodiment 4.

[0045] Figure 31 is a schematic plan view showing a configuration of a display device according to Embodiment 5.

[0046] Figure 32 is a circuit diagram showing a configuration of a selection drive circuit in a display device according to Embodiment 5.

[0047] Figure 33 is a circuit diagram showing a configuration of a selection drive circuit in a display device according to a modification of Embodiment 5.

[0048] Figure 34 is a schematic plan view showing a configuration of a display device according to Embodiment 6.

[0049] Figure 35 is a circuit diagram showing a configuration of a selection connection circuit in a display device according to Embodiment 6.

[0050] Figure 36 is a block diagram showing the configuration of a display device researched by the present inventors.

[0051] Figure 37 is a block diagram showing the configuration of a display device researched by the present inventors.

[0052] Figure 38 is a plan view showing the configuration of a display device according to a modification of Embodiment Four.

[0053] Figure 39 is a plan view showing the configuration of a display device according to a modification of Embodiment Four.

[0054] Figure 40 is a plan view showing the configuration of a display device according to a modification of Embodiment Four. DETAILED DESCRIPTION

[0055] Hereinafter, each embodiment of the present application will be described with reference to the drawings. Note that the disclosed examples are merely one example, and appropriate modifications that can be easily conceived by those skilled in the art within the scope of the present application are naturally included in the scope of the present application. In addition, the drawings are sometimes schematically shown in width, thickness, shape, and the like of each portion compared to actual modes in order to make the explanation more clear, and these are merely one example and not intended to limit the explanation of the present application.

[0056] In addition, in the present specification and each drawing, the same symbol is attached to the same portion as that described in the already appeared drawing, and detailed explanation thereof is sometimes appropriately omitted.

[0057] In the following explanation, as a display device with a touch detection function, a liquid crystal display device with a touch detection function is described as an example. However, it is not limited thereto, and can also be applied to an OLED display device with a touch detection function. In addition, as an electromagnetic induction method, two methods are described as examples, however, here, the latter method is described. For the latter method, a battery can not be installed in the pen, and thus the miniaturization and / or degree of freedom in shape of the pen can be improved.

[0058] As an electromagnetic induction method, there is a method in which a coil and a battery are installed in the pen, a magnetic field is generated in the pen, and a sensor board that receives the magnetic field energy is necessary in the touch panel. In addition, there is a method in which a coil and a capacitor are installed in the pen, a magnetic field is generated in the touch panel, and the capacitor installed in the pen accumulates the magnetic field energy, and is detected by the touch panel. In the case of this method, a sensor board that generates a magnetic field in the touch panel and receives the magnetic field energy from the pen is necessary.

[0059] Regardless of which electromagnetic induction method, in order to realize a display device with touch detection function, a sensor plate that receives electromagnetic energy needs to be added, and the price (production cost) rises.

[0060] In addition, in the electrostatic capacitance method that detects touch by a finger, a sensor plate that detects changes in capacitance is also needed. Therefore, in order to realize a display device with touch detection function, a sensor plate needs to be added, and the price rises.

[0061] In order to be able to detect both touch by a pen and touch by a finger, a sensor plate needs to be added for each, and the price further rises. For example, consider suppressing the rise in price by using a part of the sensor plate used in the electromagnetic induction method and a part of the sensor plate used in the electrostatic capacitance method in common. However, in the case of being used in common, control for switching the common part is required, and the control becomes complicated. In addition, a control circuit for the control is added, and becomes a limitation in suppressing the rise in price.

[0062] An object of the present application is to provide a display device with touch detection function that can be manufactured while suppressing the rise in price.

[0063] A display device according to an embodiment of the present application includes a pixel arrangement having a plurality of pixels arranged in a matrix, a plurality of drive wirings arranged to extend in a first direction in the pixel arrangement, respectively, and a plurality of detection wirings arranged to extend in a second direction intersecting the first direction in the pixel arrangement. When an external approaching object is detected, in a first drive wiring of the plurality of drive wirings, a magnetic field drive signal that periodically changes is supplied to a first region, and a reference signal is supplied to a second region extending in the first direction with respect to the first region. As a result, a magnetic field corresponding to the magnetic field drive signal is generated in the first drive wiring. The magnetic field generated by the external approaching object changes depending on whether the external approaching object approaches the first drive wiring. The magnetic field generated by the external approaching object is detected by the plurality of detection wirings.

[0064] In order to generate a magnetic field, consider electrically connecting between, for example, two drive wirings extending in the first direction, respectively, to constitute a coil. In this case, control of the connection between the two drive wirings is required. In contrast, in the display device according to the embodiment, control of the connection between the drive wirings is not required, and the control becomes easy. In addition, the increase in the control circuit can be suppressed. As a result, the rise in price of the display device with touch detection function can be suppressed.

[0065] In addition, in the display device according to an embodiment of the present application, the plurality of drive wirings include a second drive wiring disposed near the first drive wiring, and the second drive wiring includes a first region near the first region and a second region near the second region. In this case, when an external approaching object is detected, a reference signal is supplied to the first region in the second drive wiring, and a magnetic field drive signal is supplied to the second region in the second drive wiring. In this case, the magnetic field generated in the first drive wiring and the magnetic field generated in the second drive wiring overlap in a region between the first drive wiring and the second drive wiring. Thus, the generated magnetic field can be intensified.

[0066] Further, the display device according to an embodiment of the present application includes a plurality of drive wirings disposed in parallel with each other between a first side and a second side of a display region having the first side and the second side opposite to each other, and is a display device that detects an external approaching object approaching the display region. The display device includes a first drive circuit connected to one end portion of each of the plurality of drive wirings, and a second drive circuit connected to the other end portion of each of the plurality of drive wirings. In this case, the first drive circuit supplies a magnetic field drive signal to the one end portion of the first drive wiring disposed near the first side, and the second drive circuit supplies a reference signal to the other end portion of the first drive wiring. At this time, the first drive circuit supplies a reference signal to the one end portion of the second drive wiring disposed nearer to the second side than the first drive wiring and disposed so as to be separated from the first drive wiring by a third drive wiring, and the second drive circuit supplies a magnetic field drive signal to the other end portion of the second drive wiring.

[0067] By supplying the magnetic field drive signal and the reference signal to the first drive wiring and the second drive wiring, a strong magnetic field is generated between the first drive wiring and the second drive wiring, and is applied to the external approaching object.

[0068] By the first drive circuit and the second drive circuit supplying the magnetic field drive signal and the reference signal to the drive wiring selected from the plurality of drive wirings in such a manner that the drive wiring corresponding to the first drive wiring and the second drive wiring, respectively, moves from the first side to the second side, detection of the external approaching object approaching the display region is performed during display of one frame in the display region.

[0069] Thus, it is possible to prevent control from becoming complicated and to detect the external approaching object approaching the display region.

[0070] (Embodiment 1)

[0071] The liquid crystal display device with touch detection function (hereinafter also referred to simply as display device) according to Embodiment 1 has both a function of touch detection using an electromagnetic induction method and a function of touch detection using an electrostatic capacity method. That is, detection using a pen touch and detection using a finger touch can be performed. First, the principles of the electromagnetic induction method and the electrostatic capacity method will be described.

[0072] <Basic principle of electromagnetic induction method>

[0073] Figure 1 is an explanatory diagram schematically showing the relationship between an electronic device having a display device and a pen. Also, Figure 2 and Figure 3 are explanatory diagrams schematically showing the basic principle of the electromagnetic induction method.

[0074] In Figure 1 , the electronic device has a display device 1 housed in a metal case, a light guide plate, a sensor board, and a magnetic sheet. In the example shown in the diagram, between the display device 1 and the metal case, a sensor board is installed. In this sensor board, a plurality of coils are provided, but in Figure 1 , one of the coils is schematically shown as a sensor board inner coil (hereinafter also referred to simply as coil) L2.

[0075] Also, in the pen corresponding to an external approaching object, a coil and a capacity element are built in. In Figure 1 , the capacity element is omitted, but the coil built in the pen is schematically shown as a pen inner coil (hereinafter also referred to simply as coil) LI. The coil LI and the coil L2 are coupled by a magnetic field.

[0076] Note that, regarding the display device 1, in order to schematically show its configuration, in Figure 1 , a TFT glass substrate, a color filter, and a CF glass substrate included in the display device 1 are depicted. In the TFT glass substrate, although not shown, a plurality of layers are formed. The color filter is formed in the CF glass substrate, and between the color filter and the TFT glass substrate, a liquid crystal layer, not shown, is interposed. Also, the light guide plate is fixed by a fixing portion so as to be sandwiched between the display device 1 and the sensor board.

[0077] By the pen approaching (including contact) the electronic device, the coil LI approaches the coil L2. Thereby, magnetic field coupling between the coil LI and the coil L2 is generated, and it is detected that the pen has approached.

[0078] The detection will be described using Figure 2 and Figure 3 Figure 2 (A) of shows a state in which the coil L2 generates a magnetic field, Figure 2 ​(A) indicates a state in which the coil Ll generates a magnetic field.

[0079] In Figure 2 the coil Ll in the pen is connected in parallel with a capacitor element (hereinafter, also referred to simply as a capacitor element) C in the pen, and constitutes a resonance circuit. The coil L2 in the sensor board is indicated taking a coil of a single winding as an example, and has a pair of terminals. In the detection using the pen (at the time of touch detection), one terminal PT of the coil L2 is connected to the output of the transmission amplifier AP1 for a predetermined time, and after the predetermined time, is connected to the input of the reception amplifier AP2 for a predetermined time. In addition, the other terminal of the coil L2 in the sensor board is connected to the ground voltage Vss at the time of touch detection.

[0080] Figure 3 is a waveform chart indicating the operation at the time of touch detection. Figure 3 the horizontal axis indicates time, Figure 3 (A) of indicates a waveform of the output of the transmission amplifier AP1, Figure 3 (B) of indicates a waveform of the output of the reception amplifier AP2.

[0081] When the one terminal PT of the coil L2 is connected to the output of the transmission amplifier AP1, a transmission signal IN that periodically changes is supplied to the input of the transmission amplifier AP1. Due to this, the transmission amplifier AP1 supplies a drive signal that periodically changes, as shown in Figure 3 (A) of indicates a waveform of the output of the transmission amplifier AP1, Figure 2 (A) of indicates a waveform of the output of the transmission amplifier AP1,

[0082] The magnetic lines of force are generated with the winding of the coil L2 as the center, and thus the magnetic field on the inner side of the coil L2 becomes strong. If the coil Ll approaches the coil L2, for example, as shown in Figure 2 (A) of indicates a waveform of the output of the transmission amplifier AP1,

[0083] After the predetermined time, the terminal PT of one side of the coil L2 is connected to the input of the reception amplifier AP2 for the predetermined time (magnetic field detection period or current detection period) TDT. In the magnetic field detection period TDT, if the capacitance element C is charged in the previous magnetic field generation period TGT, the coil Ll generates a magnetic field by the charge charged in the capacitance element C. In Figure 2 (B) of FIG. 10, the magnetic flux of the coil Ll generated by the charge charged in the capacitance element C is shown as

[0084] In the touch detection, that is, in the magnetic field generation period TGT and the magnetic field detection period TDT, if the coil Ll in the pen approaches the coil L2 in the sensor board, the capacitance element C is charged in the magnetic field generation period TGT, and the magnetic flux of the coil Ll reaches the coil L2 in the magnetic field detection period TDT. Since the resonance circuit is constituted by the coil Ll and the capacitance element C, the magnetic field generated by the coil Ll changes according to the time constant of the resonance circuit. The magnetic field generated by the coil Ll changes, and thus an induced voltage is generated in the coil L2. By the induced voltage, a signal changes in the terminal PT of one side of the coil L2. The change of the signal is input to the reception amplifier AP2 as a detection signal in the magnetic field detection period TDT, amplified, and output from the reception amplifier AP2 as a sensor signal OUT.

[0085] On the other hand, in the touch detection, if the coil Ll in the pen approaches the coil L2 in the sensor board, the capacitance element C is not charged or the amount of the charge charged is small in the magnetic field generation period TGT. As a result, in the magnetic field detection period TDT, the magnetic flux of the magnetic field generated by the coil Ll cannot reach the coil L2. Therefore, in the magnetic field detection period TDT, the detection signal in the terminal PT of one side of the coil L2 does not change.

[0086] In Figure 3 , the state of the approach of the coil Ll in the pen to the coil L2 in the sensor board and the state of the non-approach of the coil Ll in the pen to the coil L2 in the sensor board are shown. That is, in Figure 3 , on the left side, the state of the non-approach of the coil Ll to the coil L2 is shown, and on the right side, the state of the approach of the coil Ll to the coil L2 is shown. Therefore, in Figure 3 (B) of FIG. 10, in the magnetic field detection period TDT shown on the left side, the detection signal does not change, and in the magnetic field detection period TDT shown on the right side, the detection signal changes. By determining the case where the detection signal changes as the presence of the pen and determining the case where the detection signal does not change as the absence of the pen, it is possible to detect the touch by the pen.

[0087] In Figure 3The value indicates whether a pen is present or absent. However, since the value of the detection signal changes based on the distance between coil L1 and coil L2, it is also possible to determine the distance between the pen and the sensor board or the pen pressure.

[0088] <Basic Principles of Electrostatic Capacitive Method>

[0089] Next, the basic principle of the electrostatic capacitance method will be explained. Here, we will use it in… Figure 1 The signal wiring formed in the display device 1 shown is used as an example to illustrate the detection of touch by a finger. Specifically, the case where a capacitive sensor board is integrated with the display device will be explained. First, regarding... Figure 1 The configuration of the display device 1 shown will be described in more detail. Figure 4 This is a schematic diagram illustrating the configuration of display device 1. Here, Figure 4 (A) is a schematic top view showing the plane of display device 1. Figure 4 (B) is a cross-sectional view schematically showing the cross-section of display device 1.

[0090] exist Figure 4 In (A), TL(0) to TL(p) represent driving electrodes formed by a layer of the first main surface TSF1 formed on the TFT glass substrate TGB (first substrate). Additionally, RL(0) to RL(p) represent detection electrodes formed by a layer of the first main surface CSF1 formed on the CF glass substrate CGB (second substrate). The TFT glass substrate TGB includes a first main surface TSF1 and a second main surface TSF2 opposite to the first main surface TSF1. Figure 4 (B)). Multiple layers are formed in the first main surface TSF1 of the TFT glass substrate TGB, but... Figure 4 In the text, only the layers constituting the driving electrodes TL(0) to TL(p) are represented.

[0091] The CF glass substrate CGB also includes a first main surface CSF1 and a second main surface CSF2 opposite to the first main surface CSF1. Figure 4 (B)). In Figure 4 In the diagram, only the layers forming the detection electrodes RL(0) to RL(p) disposed on the first main surface CSF1 are depicted. For ease of understanding, in Figure 4 In (A), it is depicted in a manner that separates the TFT glass substrate TGB and the CF glass substrate CGB, specifically, as follows Figure 4 As shown in (B), the first main surface TSF1 of the TFT glass substrate TGB (first substrate) and the second main surface CSF2 of the CF glass substrate CGB (second substrate) are opposite each other across a liquid crystal layer.

[0092] between the first main surface TSFl of the TFT glass substrate TGB and the second main surface CSF2 of the CF glass substrate CGB, but in Figure 4 , only the driving electrodes TL(0) to TL(n+2), the liquid crystal layer, and the color filter are shown as being interposed between the first main surface TSFl and the second main surface CSF2. In addition, in the first main surface CSFl of the CF glass substrate CGB, as shown in (A) of Figure 4 , a plurality of detection electrodes RL(0) to RL(p) and a polarizing plate are arranged. In (B) of Figure 4 , only the detection electrode RL(n) among the plurality of detection electrodes RL(0) to RL(p) is shown as an example of the detection electrode.

[0093] In the present specification, as shown in (B) of Figure 4 , a state when viewed from the first main surfaces CSFl and TSFl of the CF glass substrate CGB and the TFT glass substrate TGB is explained as a plan view. That is, the plan view is a state when viewed from the first main surfaces CSFl and TSFl of the CF glass substrate CGB and the TFT glass substrate TGB. Therefore, although it is described that the detection electrodes and the polarizing plate are arranged on the first main surface CSFl side of the CF glass substrate CGB, if the direction of view is changed, for example, the detection electrodes and the polarizing plate become arranged on the right side, the left side, or the lower side of the CF glass substrate CGB. In (B) of Figure 4 , 13 denotes an amplification circuit connected to the detection electrode RL(n).

[0094] When viewed from the first main surfaces CSFl and TSFl as a plan view, as shown in (A) of Figure 4 , in the first main surface TSFl of the TFT glass substrate TGB, the driving electrodes TL(0) to TL(p) extend in the row direction (lateral direction) and are arranged in parallel in the column direction (vertical direction). In addition, as shown in (A) of Figure 4 , in the first main surface CSFl of the CF glass substrate CGB, the detection electrodes RL(0) to RL(p) extend in the column direction (vertical direction) and are arranged in parallel in the row direction (lateral direction).

[0095] As shown in (B) of Figure 4 , the CF glass substrate CGB, the liquid crystal layer, and the like are interposed between the driving electrodes TL(0) to TL(p) and the detection electrodes RL(0) to RL(p). Therefore, the driving electrodes TL(0) to TL(p) and the detection electrodes RL(0) to RL(p) cross each other when viewed as a plan view, but are electrically separated from each other. Since there is a capacitance between the driving electrodes and the detection electrodes, in Figure 4In (B) of FIG. 1, the capacitance is shown by a broken line as a capacitance element. Note that the drive electrodes TL(0) to TL(p) are separated from each other, and the detection electrodes RL(0) to RL(p) are separated from each other.

[0096] For the drive electrodes TL(0) to TL(p), a drive signal for display (display drive signal) is supplied when display is performed, and a drive signal for touch detection is supplied when touch with a finger is detected.

[0097] In this embodiment mode 1, touch with a finger is detected using an electric field, and touch with a pen is detected using a magnetic field (see Figure 1 Figure 2 and Figure 3 ). Thus, in this specification, detection of touch using a magnetic field is referred to as magnetic field touch detection, and detection of touch using an electric field is referred to as electric field touch detection. In the following, it is described that, for the drive electrodes TL(0) to TL(p), a drive signal for touch detection is also supplied when magnetic field touch detection is performed. Thus, for the drive electrodes TL(0) to TL(p), corresponding drive signals are supplied when display is performed, when electric field touch detection is performed, and when magnetic field touch detection is performed. That is, the drive electrodes TL(0) to TL(p) are commonly used (dual use) when display is performed, when electric field touch detection is performed, and when magnetic field touch detection is performed. When viewed from the standpoint of being commonly used, the drive electrodes TL(0) to TL(p) can each be regarded as a common electrode.

[0098] During electric field touch detection, a drive signal Tx for an electric field is supplied to the drive electrodes TL(0) to TL(p). To a drive electrode selected in a manner to detect touch, a signal in which a voltage periodically changes is supplied as the drive signal Tx, and to a drive electrode which becomes non-selected in a manner not to detect touch, a predetermined fixed voltage is supplied as the drive signal Tx. During electric field touch detection, the drive electrodes TL(0) to TL(p) are sequentially selected, for example, in this order. In Figure 4 In (A) of FIG. 1, a state in which a signal in which a voltage periodically changes is supplied as a drive signal Tx(2) to the drive electrode TL(2) is shown, for example, the drive electrodes are sequentially selected from the drive electrode TL(0) toward TL(p), and a drive signal in which a voltage periodically changes is supplied.

[0099] In contrast, during display, a predetermined fixed voltage or a voltage corresponding to image information to be displayed is supplied to the drive electrodes TL(0) to TL(p) as a display drive signal.

[0100] Next, the basic principle of the electrostatic capacitance method is described using Figure 5 . In Figure 5 ​In this case, TL(0) ~ TL(p) are Figure 4 the driving electrodes, and RL(0) ~ RL(p) are Figure 4 the detection electrodes. In Figure 5 (A) of FIG. 1, the driving electrodes TL(0) ~ TL(p) are respectively extended in the row direction and are arranged in parallel in the column direction. In addition, the detection electrodes RL(0) ~ RL(p) are respectively extended in the column direction in a manner that intersects the driving electrodes TL(0) ~ TL(p) and are arranged in parallel in the row direction. As shown in Figure 4 (B) of FIG. 1, a liquid crystal layer or the like is arranged between the detection electrodes RL(0) ~ RL(p) and the driving electrodes TL(0) ~ TL(p) so that a gap is generated between the detection electrodes RL(0) ~ RL(p) and the driving electrodes TL(0) ~ TL(p).

[0101] In Figure 5 (A) of FIG. 1, 12-0 ~ 12-p respectively schematically represent unit driving electrode drivers. In this figure, from the unit driving electrode drivers 12-0 ~ 12-p, the driving signals Tx(0) ~ Tx(p) are output. In addition, 13-0 ~ 13-p respectively schematically represent unit amplification circuits. In Figure 5 (A) of FIG. 1, the pulse signal surrounded by the solid line o represents the waveform of the driving signal Tx supplied to the selected driving electrode. As the external approaching object, in this figure, a finger is shown as FG.

[0102] In Figure 5 the example of (A) of FIG. 1, the pulse signal is supplied from the unit driving electrode driver 12-2 to the driving electrode TL(2) as the driving signal Tx(2). By supplying the driving signal Tx(2) as the pulse signal to the driving electrode TL(2), as shown in Figure 5 (B) of FIG. 1, an electric field is generated between the driving electrode TL(2) and the intersecting detection electrode RL(n). At this time, if the finger FG touches the position of the driving electrode TL(2) that approaches the liquid crystal panel, an electric field is also generated between the finger FG and the driving electrode TL(2), and the electric field generated between the driving electrode TL(2) and the detection electrode RL(n) is reduced. Due to this, the amount of electric charge between the driving electrode TL(2) and the detection electrode RL(n) is reduced. As a result, as shown in Figure 5 (C) of FIG. 1, the amount of electric charge generated in response to the supply of the driving signal Tx(2) is reduced by ΔQ when the finger FG touches. The difference in the amount of electric charge is represented as a difference in voltage in the detection signal Rx(n), which is supplied to the unit amplification circuit 13-n and is amplified.

[0103] Note that, in Figure 5In (C) of FIG. 9, the horizontal axis represents time, and the vertical axis represents the amount of electric charge. In response to the rising edge of the drive signal Tx(2), the amount of electric charge increases (increases toward the upper side in the figure), and in response to the falling edge of the voltage of the drive signal Tx(2), the amount of electric charge increases (increases toward the lower side in the figure). At this time, the increased amount of electric charge varies depending on the presence or absence of the touch of the finger FG. In addition, in this figure, the reset is performed after the increase of the amount of electric charge toward the upper side and before the increase toward the lower side, and similarly, the reset of the amount of electric charge is performed after the increase of the amount of electric charge toward the lower side and before the increase toward the upper side. In this way, the amount of electric charge varies up and down based on the reset amount of electric charge. In other words, a signal change occurs in the detection electrode RL(n) in accordance with the touch.

[0104] The drive electrodes TL(0) to TL(p) are sequentially selected, and the drive signals Tx(0) to Tx(p) as pulse signals are supplied to the selected drive electrodes, whereby the detection signals Rx(0) to Rx(p) having voltage values corresponding to whether the finger FG touches the positions close to the respective intersecting portions are respectively output from the plurality of detection electrodes RL(0) to RL(p) intersecting the selected drive electrodes. At the time when the difference AQ occurs in the amount of electric charge, the detection signals Rx(0) to Rx(p) are respectively sampled, and converted into digital signals using an analog / digital conversion section. By performing signal processing on the converted digital signals, it is possible to extract the coordinates of the touched position.

[0105] <Display device and integrated configuration of coil in sensor board>

[0106] The present inventors have considered that in the case where the display device 1 and the sensor board are prepared separately as shown in Figure 1 , the sensor board is expensive, and thus the electronic device becomes expensive. Therefore, the present inventors have considered that the coil L2 (which constitutes the sensor board) is formed by a layer of the display device 1, and the display device and the sensor board are integrated. Figure 1

[0107] Figure 6 is a cross-sectional view showing the display device 1 after the sensor board is integrated as a sensor layer (layer). Figure 6 is similar to Figure 1 , and thus only the difference points will be mainly described. In Figure 1 , the sensor board can also be prepared independently of the display device 1, and the sensor board is provided between the light guide plate and the magnetic sheet. In contrast to this, in Figure 6 (A), the sensor layer is formed in the CF glass substrate CGB. In addition, in Figure 6 (B), the sensor layer is formed in the TFT glass substrate TGB. Thus, since the sensor layer corresponding to the sensor board is provided in the display device 1, it is possible to suppress the increase in price. ​

[0108] As explained in Figure 2 and Figure 3 , the coil L2 in the sensor plate generates a magnetic field during the magnetic field generation period TGT, and detects a magnetic field generated by the coil LI in the pen during the magnetic field detection period TDT. That is, the coil L2 in the sensor plate serves both for the generation of a magnetic field and for the detection of a magnetic field. In the case of such dual use, in (A) of Figure 6 , the coil L2 is constituted by a layer formed in the CF glass substrate CGB. Similarly, in (B) of Figure 6 , the coil L2 is constituted by a layer formed in the TFT glass substrate TGB.

[0109] However, it is also possible to separately constitute a coil that generates a magnetic field during the magnetic field generation period TGT, and a coil that detects a magnetic field during the magnetic field detection period TDT. In this case, for example, it is possible to constitute a coil that generates a magnetic field (hereinafter also referred to as a magnetic field generation coil) by the sensor layer shown in (B) of Figure 6 , and to constitute a coil that detects a magnetic field (hereinafter also referred to as a magnetic field detection coil) by the sensor layer shown in (A) of Figure 6 . Also in the TFT glass substrate TGB, there are a plurality of layers that can be used as sensor layers. Therefore, it is also possible to separately constitute a magnetic field generation coil and a magnetic field detection coil by the sensor layers shown in (B) of Figure 6 .

[0110] Figure 7 Examples in which a magnetic field generation coil and a magnetic field detection coil are separately constituted are shown in Figure 7 . In Figure 7 , CX(n) to CX(n+2) represent, for example, a magnetic field generation coil, and CY(n) to CY(n+2) represent a magnetic field detection coil. In Figure 7 , the drive electrodes TL(0) to TL(p) explained in Figure 4 are used as layers that constitute a magnetic field generation coil, and the signal lines SL(0) to SL(p) that transfer image information are used as layers that constitute a magnetic field detection coil. With respect to the signal lines SL(0) to SL(p), as explained later, layers formed in the TFT glass substrate TGB are used, as with the drive electrodes TL(0) to TL(p), and in Figure 7 , are arranged in parallel in the lateral direction.

[0111] As shown in Figure 4 and Figure 7 , the drive electrodes TL(0) to TL(p) extend in parallel with each other in the lateral direction. During the magnetic field generation period TGT, as shown in Figure 7As shown, the end portion of one side of each of the drive electrodes TL(n+1), TL(n+2) and the end portion of one side of each of the drive electrodes TL(n+6), TL(n+7) are electrically connected, and the end portion of the other side of each of the drive electrodes TL(n) to TL(n+2) and the end portion of the other side of each of the drive electrodes TL(n+6) to TL(n+8) are electrically connected. Thus, the coil CX(n) of the third winding in which the drive electrodes TL(n) to TL(n+2) and TL(n+6) to TL(n+8) are wound can be formed. Similarly, by electrically connecting predetermined drive electrodes during the magnetic field generation period TGT, the coils CX(n+1), CX(n+2) and the like of the third winding can be constituted.

[0112] Similarly, during the magnetic field detection period TDT, the end portion of one side of each of the signal lines SL(n+1), SL(n+2) and the end portion of one side of each of the signal lines SL(n+6), SL(n+7) are electrically connected, and the end portion of the other side of each of the signal lines SL(n) to SL(n+2) and the end portion of the other side of each of the signal lines SL(n+6) to SL(n+8) are electrically connected. Thus, the coil CY(n) of the third winding in which the signal lines SL(n) to SL(n+2) and SL(n+6) to SL(n+8) are wound can be formed. Similarly, by electrically connecting predetermined signal lines during the magnetic field detection period TDT, the coils CY(n+1), CY(n+2) and the like of the third winding can be constituted.

[0113] The coils CX(n) to CX(n+2) and the coils CY(n) to CY(n+2) cross in a state of being electrically separated. For example, the end portion of one side of the drive electrode TL(n) constituting the coil CX(n) corresponds to Figure 2 The terminal PT shown is supplied with an output from the Figure 1 transmission amplifier API during the magnetic field generation period TGT, and the end portion of the other side of the drive electrode TL(n+8) is supplied with a ground voltage Vss. Thus, as described in (A) of Figure 2 , a magnetic field is generated in the coil CX(n). By the magnetic field generated in the coil CX(n), an electric charge is accumulated in the capacitor element C( Figure 2 ) in the pen.

[0114] During the magnetic field detection period TDT, predetermined signal lines are electrically connected, and the coils CY(n) to CY(n+2) are formed. By the electric charge accumulated in the capacitor element C in the pen, a magnetic field is generated in the coil L1( Figure 1 ). By the coils CY(n) to CY(n+2), the generated magnetic field is detected. Thus, whether the pen is close, the area to which the pen is close, and the distance from the pen can be detected.

[0115] <Technical problem of magnetic field generating coil>

[0116] In the electromagnetic induction method, the present inventors have studied the configuration of a display device using a magnetic field generating coil before the present invention. Figure 36 and Figure 37 is a block diagram showing the configuration of a display device that the present inventors have studied before. Here, as the magnetic field generating coil, the same as Figure 7 is explained.

[0117] In Figure 36 and Figure 37 , TL(n) ~ TL(n+5) represent the drive electrodes. In addition, USR(n) ~ USR(n+5) and USL(n) ~ USL(n+5) represent the unit drive circuits, respectively. In Figure 36 and Figure 37 , VCOM represents a voltage wiring that supplies a ground voltage Vss, TSV represents a signal wiring that supplies a drive signal TSVCOM that periodically changes in voltage, and CNR and CNL represent signal wirings that connect between the drive electrodes in a magnetic field generation period TGT.

[0118] In these diagrams, SL11 ~ SL13, SL21 ~ SL23, SL31 ~ SL33, SL41 ~ SL43, SL51 ~ SL53, and SL61 ~ SL63 represent switches. The switches SL11 ~ SL13 form a first switch group that corresponds to the drive electrode TL(n). Similarly, the switches SL21 ~ SL23 form a first switch group that corresponds to the drive electrode TL(n+1), the switches SL31 ~ SL33 form a first switch group that corresponds to the drive electrode TL(n+2), and the switches SL41 ~ SL43 form a first switch group that corresponds to the drive electrode TL(n+3). In addition, the switches SL51 ~ SL53 form a first switch group that corresponds to the drive electrode TL(n+4), and the switches SL61 ~ SL63 form a first switch group that corresponds to the drive electrode TL(n+5).

[0119] Among the switches constituting the first switch group, SL11, SL21, SL31, SL41, SL51, and SL61 become first switches, and each of the first switches is connected to an end portion of one side of the signal line TSV and the corresponding drive electrode. In addition, among the switches constituting the first switch group, SL12, SL22, SL32, SL42, SL52, and SL62 become second switches, and each of the second switches is connected to an end portion of one side of the voltage line VCOM and the corresponding drive electrode. Furthermore, among the switches constituting the first switch group, SL13, SL23, SL33, SL43, SL53, and SL63 become third switches, and each of the third switches is connected to an end portion of one side of the signal line CNL and the corresponding drive electrode.

[0120] In Figure 36 and Figure 37 , SR11 to SR13, SR21 to SR23, SR31 to SR33, SR41 to SR43, SR51 to SR53, and SR61 to SR63 also indicate switches. The switches SR11 to SR13 constitute a second switch group, and correspond to the drive electrode TL(n). Similarly, the switches SR21 to SR23 constitute a second switch group, and correspond to the drive electrode TL(n+1), the switches SR31 to SR33 constitute a second switch group, and correspond to the drive electrode TL(n+2), and the switches SR41 to SR43 constitute a second switch group, and correspond to the drive electrode TL(n+3). In addition, the switches SR51 to SR53 constitute a second switch group, and correspond to the drive electrode TL(n+4), and the switches SR61 to SR63 constitute a second switch group, and correspond to the drive electrode TL(n+5).

[0121] Here, among the switches constituting the second switch group, SR11, SR21, SR31, SR41, SR51, and SR61 also become first switches, and each of the first switches is connected to an end portion of the other side of the signal line TSV and the corresponding drive electrode. In addition, among the second switch group, SR12, SR22, SR32, SR42, SR52, and SR62 become second switches, and each of the second switches is connected to an end portion of the other side of the voltage line VCOM and the corresponding drive electrode. Furthermore, among the second switch group, SR13, SR23, SR33, SR43, SR53, and SR63 become third switches, and each of the third switches is connected to an end portion of one side of the signal line CNL and the corresponding drive electrode.

[0122] Each of the unit drive circuits USL(n) to USL(n+5) corresponds to each of the drive electrodes TL(n) to TL(n+5), and each of the unit drive circuits USR(n) to USR(n+5) also corresponds to each of the drive electrodes TL(n) to TL(n+5). Each of the unit drive circuits USL(n) to USL(n+5) and USR(n) to USR(n+5) controls the first and second switch groups so that a magnetic field and an electric field are generated in the corresponding drive electrode when a magnetic field touch detection and an electric field touch detection are performed.

[0123] That is, in the case where a magnetic field is generated in the corresponding drive electrode, the first and second switch groups are controlled in a manner that two drive electrodes across the corresponding drive electrode are selected. A coil is formed by the two selected drive electrodes, and the corresponding drive electrode is disposed inside the coil. As a result, a strong magnetic field is generated in the region of the corresponding drive electrode. On the other hand, in the case where an electric field is generated in the corresponding drive electrode, the first and second switch groups are controlled in a manner that the corresponding drive electrode is selected.

[0124] <<Magnetic field touch detection>>

[0125] If the operation is described by taking the case where a magnetic field is generated in the region of the drive electrode TL(n+2) when a magnetic field touch detection is performed as an example, the following is described. The drive electrodes across the drive electrode TL(n+2) are the drive electrodes TL(n+1) and TL(n+3). The unit drive circuits USL(n+2) and USR(n+2) corresponding to the drive electrode TL(n+2) control the first switch groups (SL21, SL22, SL23), (SL41, SL42, SL43) and the second switch groups (SR21, SR22, SR23), (SR41, SR42, SR43) corresponding to the drive electrodes TL(n+1), TL(n+3), respectively, across the drive electrode TL(n+2).

[0126] That is, the unit drive circuit USL(n+2) makes the first switch SL21 and the second switch SL42 in the first switch groups (SL21, SL22, SL23), (SL41, SL42, SL43) be in an on state (conductive state), and makes the remaining switches be in an off state (non-conductive state). In addition, the unit drive circuit USR(n+2) makes the third switches SR23, SR43 in the second switch groups (SR21, SR22, SR23), (SR41, SR42, SR43) be in an on state (conductive state), and makes the remaining switches be in an off state (non-conductive state).

[0127] As a result, as shown in FIG. 6, a magnetic field is generated in the region of the drive electrode TL(n+2). In addition, a magnetic field is also generated in the regions of the drive electrodes TL(n+1) and TL(n+3) across the drive electrode TL(n+2). Figure 36As shown, the end portion of one side of the drive electrode TL(n+1) is connected to the signal wiring TSV via the first switch SL21, and the end portion of the other side of the drive electrode TL(n+1) is connected to the signal wiring CNR via the third switch SR23. Further, the end portion of one side of the drive electrode TL(n+3) is connected to the voltage wiring VCOM via the second switch SL42, and the end portion of the other side of the drive electrode TL(n+3) is connected to the signal wiring CNR via the third switch SR43. As a result, the end portions of the other sides of the drive electrodes TL(n+1) and TL(n+3) which are arranged in parallel with the drive electrode TL(n+2) therebetween are electrically connected by the signal wiring CNR, thereby forming a coil with the drive electrode TL(n+2) as the inner side.

[0128] In the case of magnetic field touch detection, during the magnetic field generation period TGT, the ground voltage Vss is supplied to the voltage wiring VCOM, and the drive signal TSVCOM whose voltage periodically changes is supplied to the signal wiring TSV. Therefore, the drive signal TSVCOM is supplied to the end portion of one side of the drive electrode TL(n+1) as the magnetic field drive signal via the first switch SL21, and the ground voltage Vss is supplied to the end portion of one side of the drive electrode TL(n+3) via the second switch SL42. Thus, a magnetic field is generated by the magnetic field generation coil composed of the drive electrodes TL(n+1), TL(n+3), and a strong magnetic field is formed in the drive electrode TL(n+2).

[0129] In Figure 36 , the arrows I1, I2 indicate the currents flowing in the drive electrodes TL(n+1), TL(n+3) by the drive signal TSVCOM and the directions thereof. The drive electrode TL(n+1) generates a magnetic field in the direction shown by the arrow dotted line by the current I1 flowing therein. The direction of the current I2 flowing in the drive electrode TL(n+3) is opposite to that of the current I1, and thus the drive electrode TL(n+3) generates a magnetic field in the direction shown by the arrow dotted line. In the drive electrode TL(n+2), a strong magnetic field is generated by overlapping the magnetic field generated by the drive electrode TL(n+1) and the magnetic field generated by the drive electrode TL(n+3).

[0130] Note that the first, second, and third switches in the first switch groups (SL21, SL22, SL23), (SL41, SL42, SL43) and the second switch groups (SR21, SR22, SR23), (SR41, SR42, SR43) other than the above-described first switch groups and the second switch groups are brought to the open state by the unit drive circuits other than the above-described unit drive circuits USL(n+2), USR(n+2).

[0131] The unit drive circuits USL(n) to USL(n+5) are connected in series, including a function as a shift register. Similarly, the USR(n) to USR(n+5) are also connected in series, including a function as a shift register. For example, selection information that selects a drive electrode that generates a magnetic field is set in the unit drive circuits USL(n), USR(n), and the selection information is sequentially shifted toward the unit drive circuits USL(n+5), USR(n+5). The unit drive circuits to which the selection information arrives control the first switch group and the second switch group as described above, in a manner that generates a magnetic field in the corresponding drive electrode. That is, Figure 36 A state in which the selection information has arrived at the unit drive circuits USL(n+2), USR(n+2) is shown in FIG. 17.

[0132] A state in which the selection information has arrived at the unit drive circuits USL(n+3), USR(n+3) by the shift operation is shown in FIG. 18. The operation when the selection information has arrived at the unit drive circuits USL(n+3), USR(n+3) is the same as the operation described in FIG. 16, and the description is omitted. Figure 37 Figure 36

[0133] In this way, the drive electrode that generates a strong magnetic field is also sequentially switched (moved) by the shift of the selection information.

[0134] <<Electric field touch detection>>

[0135] Next, the operation in the case of electric field touch detection will be described. Here, the drive electrode TL(n+2) will be described as an example.

[0136] In the case of electric field touch detection, the unit drive circuits USL(n+2), USR(n+2) control the first switch group and the second switch group differently from the case of magnetic field touch detection. That is, the first switch group (SL31, SL32, SL33) and the second switch group (SR31, SR32, SR33) connected to the drive electrode TL(n+2) corresponding to the unit drive circuits USL(n+2), USR(n+2) are controlled. In this case, the first switch SL31 in the first switch group (SL31, SL32, SL33) and the first switch SR31 in the second switch group (SR31, SR32, SR33) are made to be in an on state, and the second switch SL32, SR32 and the third switch SL33, SR33 are made to be in an off state.

[0137] ​​In the electric field touch detection, the signal wiring TSV is also supplied with a drive signal TSVCOM which periodically changes in voltage. Therefore, to the drive electrode TL(n+2), from both end portions thereof, the drive signal TSVCOM is supplied via the first switches SL31, SR31 as an electric field drive signal. At this time, the first switches, the second switches and the third switches in the remaining first switch group and the second switch group become in an off state. Therefore, the drive electrodes TL(n) to TL(n+1) and TL(n+3) to TL(n+5) become in a floating state.

[0138] If the selection information is moved from the unit drive circuits USL(n+2), USR(n+2) to the unit drive circuits USL(n+3), USR(n+3) by the shift operation, the unit drive circuits USL(n+3), USR(n+3) control the first switch group and the second switch group connected to the corresponding drive electrode TL(n+3) in the same manner as described above. Thereby, to the drive electrode TL(n+3), the drive signal TSVCOM is supplied as an electric field drive signal.

[0139] <<Technical Problem>>

[0140] In the case of the magnetic field touch detection, in order to form the magnetic field generating coil, as described above, it is required to connect between the plurality of drive electrodes arranged in parallel to each other via the signal wiring (CNR, CNL) and the third switch. Further, in this case, the switch group connected to the drive electrode which is different from the drive electrode arranged in the region where the strong magnetic field is generated is controlled. On the other hand, in the case of the electric field touch detection, the switch group connected to the drive electrode arranged in the region where the electric field is generated is controlled. Therefore, a technical problem that the control becomes complicated arises. Further, a technical problem that the occupied area of the drive circuit (control circuit) which performs the control also becomes large arises.

[0141] <Overall Configuration of Display Device>

[0142] Figure 8 is a block diagram showing the configuration of the display device 1 according to Embodiment 1. Here, although not particularly limited, the case where the display device 1 is a liquid crystal display device is exemplified and described. In Figure 8 the display device 1 includes a display panel (liquid crystal panel) 2, a signal line selector 3, a display control device 4, a gate driver 5 and a touch control device 6. Further, the display device 1 includes selection drive circuits (first drive circuit, second drive circuit) SSR, SSL, a switching adjustment circuit SCX and an amplification circuit AMP. As to these devices and circuits included in the display device 1, detailed description will be given later, and thus the overall outline is described here.

[0143] The display panel 2 is used in the rear surface Figure 12 An explanation will be given of a pixel array LCD having a plurality of pixels arranged in a matrix. In the pixel array LCD, a plurality of signal lines, a plurality of drive electrodes, and a plurality of scan lines are arranged. Here, the signal lines are arranged in respective columns of the pixel array LCD, the drive electrodes are arranged in rows of the pixel array LCD, and the plurality of scan lines are arranged in respective rows of the pixel array LCD. As described in Figure 8 , the signal lines extend in the longitudinal direction (column direction) and are arranged in parallel in the lateral direction (row direction). In addition, the drive electrodes extend in the lateral direction and are arranged in parallel in the longitudinal direction. Furthermore, the scan lines extend in the lateral direction and are arranged in parallel in the longitudinal direction. In this case, the pixels are arranged in portions where the signal lines and the scan lines cross. During a display period (display period), the pixels are selected by the signal lines and the scan lines, and to the selected pixels, a voltage of the signal line at that time and a voltage of the drive electrode (display drive signal) are applied, and the selected pixels perform display in accordance with a voltage difference between the signal line and the drive electrode.

[0144] The display control device 4 includes a control circuit D-CNT and a signal line driver D-DRV. The control circuit D-CNT receives a timing signal supplied to an external terminal Tt and image information supplied to an input terminal Ti, forms an image signal Sn in accordance with the image information supplied to the input terminal Ti, and supplies the image signal Sn to the signal line driver D-DRV. The signal line driver D-DRV supplies the supplied image signal Sn to the signal line selector 3 in accordance with time division multiplexing at a display period. In addition, the control circuit D-CNT receives a timing signal supplied to the external terminal Tt and a control signal SW from the touch control device 6, and forms various control signals. As the control signals formed by the control circuit D-CNT, there are a selection signal SEL1, SEL2, a synchronization signal TSHD, a clock signal CLK, a magnetic field enable signal SC_EN, an electric field enable signal TC_EN, a drive signal TSVCOM, a control signal Y-CNT related to touch detection, a clock signal CLK, and the like, which are supplied to the signal line selector 3.

[0145] Among the signals formed by the control circuit D-CNT, the magnetic field enable signal SC_EN is an enable signal indicating that magnetic field touch detection is performed, and the electric field enable signal TC_EN is an enable signal indicating that electric field touch detection is performed. In addition, the synchronization signal TSHD is a synchronization signal that identifies a period (display period) during which display is performed in the display panel 2 and a period (touch detection period) during which touch detection (magnetic field touch detection and electric field touch detection) is performed. The drive signal TSVCOM is a signal whose voltage periodically changes at the touch detection period, and is supplied to the drive electrode as a magnetic field drive signal or an electric field drive signal.

[0146] The signal line driver D-DRV supplies the image signal Sn to the signal line selector 3 in a time-division multiplexed manner in accordance with the selection signals SELl, SEL2 during the display period. The signal line selector 3 is connected to the plurality of signal lines provided in the display panel 2, and supplies the supplied image signal to the appropriate signal line in accordance with the selection signals SELl, SEL2 during the display period. The gate driver 5 forms the scan line signals VsO ~ Vsp in accordance with the timing signals from the control circuit D-CNT during the display period, and supplies them to the scan lines in the display panel 2. In the display period, the pixels connected to the scan lines to which the high-level scan line signals are supplied are selected, and the selected pixels perform display in accordance with the image signal supplied to the signal line at that time, thereby performing display.

[0147] The touch control device 6 includes a detection circuit DET that receives the sensing signals S(O) ~ S(P), a processing circuit PRS that processes the detection signal DET-D from the detection circuit DET to extract the coordinates of the touched position, and a control circuit T-CNT. The control circuit T-CNT receives the synchronization signal TSHD, the magnetic field enable signal SC_EN, and the electric field enable signal TC_EN from the display control device 4, and controls them in such a manner that the touch control device 6 acts in synchronization with the display control device 4.

[0148] That is, the control circuit T-CNT controls the detection circuit DET and the processing circuit PRS to act in accordance with the synchronization signal TSHD, the magnetic field enable signal SC_EN, and the electric field enable signal TC_EN when touch detection is indicated. In addition, the control circuit T-CNT receives the detection signal from the detection circuit DET, forms the control signal SW, and supplies it to the control circuit D-CNT. The processing circuit PRS outputs the extracted coordinates as coordinate information from the external terminal To.

[0149] The display panel 2 has edges 2-U, 2-D parallel to the rows of the pixel array LCD, and edges 2-R, 2-L parallel to the columns of the pixel array LCD. Here, the edges 2-U and 2-D are edges opposite to each other, and are arranged so that the plurality of drive electrodes and the plurality of scan lines in the pixel array LCD are sandwiched between the edges 2-U and 2-D. In addition, the edges 2-R and 2-L are also edges opposite to each other, and are arranged so that the plurality of signal lines in the pixel array LCD are sandwiched between the edges 2-R and 2-L.

[0150] The selection drive circuit SSR is arranged along the edge 2-R of the display panel 2, and the selection drive circuit SSL is arranged along the edge 2-L of the display panel 2. The selection drive circuit SSR is combined with the plurality of drive electrodes arranged in the display panel 2 on the edge 2-R side of the display panel 2, and the selection drive circuit SSL is combined with the plurality of drive electrodes arranged in the display panel 2 on the edge 2-L side of the display panel 2. That is, the selection drive circuits SSR and SSL are connected to the drive electrodes arranged in the display panel 2 outside the display panel 2.

[0151] The selection drive circuit SSR includes a drive circuit SR-R and a selection circuit SR-C. The drive circuit SR-R includes a shift register having a plurality of shift stages, and selection information SEI is set in the shift register by a control signal Y-CNT. The set selection information SEI is sequentially shifted in synchronization with a clock signal CLK.

[0152] In a case where the magnetic field touch detection is designated by the magnetic field enable signal SC EN, the drive circuit SR-R forms and outputs selection signals in accordance with the selection information stored in the shift register. Although not particularly limited, in this embodiment, the drive circuit SR-R forms two selection signals in accordance with the selection information if the magnetic field touch detection is designated. On the other hand, even in a case where the electric field touch detection is designated by the electric field enable signal TC EN, the drive circuit SR-R forms and outputs selection signals in accordance with the selection information stored in the shift register. Although not particularly limited, in this embodiment, the drive circuit SR-R forms one selection signal in accordance with the selection information if the electric field touch detection is designated.

[0153] The selection circuit SR-C receives the selection signals from the drive circuit SR-R, and connects the drive electrodes designated by the selection signals to a signal line (magnetic field drive signal line) TSV and a voltage line (reference signal line) VCOM. That is, when the magnetic field touch detection, the drive electrodes designated by the selection signal of one of the two selection signals are connected to the signal line TSV, and the drive electrodes designated by the selection signal of the other are connected to the voltage line VCOM. On the other hand, when the electric field touch detection, the drive electrodes designated by the selection signal are connected to the signal line TSV.

[0154] In this embodiment, when the magnetic field touch detection is specified by the magnetic field touch detection enable signal SC EN, the drive signal TSV COM is supplied to the signal line TSV. In addition, when the magnetic field touch detection and the electric field touch detection are specified by the magnetic field touch detection enable signal SC EN and the electric field touch detection enable signal TC EN, the drive signal TSV COM is supplied to the signal line TSV. Thus, when the magnetic field touch detection is specified by the magnetic field touch detection enable signal SC EN, the drive signal TSV COM is supplied to the drive electrode specified by the selection signal of one of the two selection signals via the selection circuit SR-C as the magnetic field drive signal. At this time, the ground voltage Vss is supplied to the drive electrode specified by the selection signal of the other selection signal via the selection circuit SR-C.

[0155] In addition, when the electric field touch detection is specified by the electric field touch detection enable signal TC EN, the drive signal TSV COM is supplied to the drive electrode specified by the selection signal via the selection circuit SR-C as the electric field drive signal.

[0156] The selection drive circuit SSL has the same configuration as the selection drive circuit SSR. That is, the selection drive circuit SSL includes a drive circuit SL-R and a selection circuit SL-C. The drive circuit SL-R includes a shift register having a plurality of shift stages, and selection information SEI is set in the shift register in accordance with a control signal Y-CNT. The set selection information is sequentially shifted in synchronization with a clock signal CLK.

[0157] In the case where the magnetic field touch detection is specified by the magnetic field touch detection enable signal SC EN, the drive circuit SL-R forms and outputs the selection signal in accordance with the selection information stored in the shift register. The drive circuit SL-R forms two selection signals in accordance with the selection information if the magnetic field touch detection is specified. On the other hand, even in the case where the electric field touch detection is specified by the electric field touch detection enable signal TC EN, the drive circuit SL-R forms and outputs the selection signal in accordance with the selection information stored in the shift register. However, the drive circuit SL-R forms one selection signal in accordance with the selection information if the electric field touch detection is specified.

[0158] The selection circuit SL-C receives the selection signal from the drive circuit SL-R, and connects the drive electrode specified by the selection signal to the signal line TSV and the voltage line VCOM. That is, when the magnetic field touch detection is specified, the drive electrode specified by the selection signal of one of the two selection signals is connected to the voltage line VCOM, and the drive electrode specified by the selection signal of the other selection signal is connected to the signal line TSV. On the other hand, when the electric field touch detection is specified, the drive electrode specified by the selection signal of one selection signal is connected to the signal line TSV.

[0159] Thus, when magnetic field touch detection is performed, a ground voltage Vss is supplied to the drive electrode specified by one of the two selection signals via the selection circuit SL-C. At this time, a drive signal TSVCOM is supplied to the drive electrode specified by the other selection signal via the selection circuit SL-C as a magnetic field drive signal.

[0160] In addition, when electric field touch detection is performed, a drive signal TSVCOM is supplied to the drive electrode specified by the selection signal via the selection circuit SL-C as an electric field drive signal.

[0161] The selection drive circuit SSR and the selection drive circuit SSL operate in synchronization with each other. Although not particularly limited, in this embodiment, the selection drive circuit SSR and the selection drive circuit SSL operate in synchronization by supplying the same clock signal CLK to the selection drive circuit SSR and the selection drive circuit SSL and supplying the same control signal Y-CNT to the selection drive circuit SSR and the selection drive circuit SSL.

[0162] When magnetic field touch detection is performed, the drive electrode specified by the selection information in the selection drive circuit SSR is the same as the drive electrode specified by the selection information in the selection drive circuit SSL. In other words, when magnetic field touch detection is performed, two drive electrodes among the plurality of drive electrodes are respectively specified by the selection drive circuit SSR and the selection drive circuit SSL. In this case, in the selection circuit SR-C, the drive electrode connected to the voltage line VCOM is connected to the signal line TSV in the selection circuit SL-C. In addition, in the selection circuit SR-C, the drive electrode connected to the signal line TSV is connected to the voltage line VCOM in the selection circuit SL-C.

[0163] Thus, in the two specified drive electrodes, currents corresponding to voltage changes of the magnetic field drive signal (drive signal TSVCOM) respectively flow, and magnetic fields are generated in the respective drive electrodes. In addition, the directions of the currents flowing are opposite to each other, and thus the magnetic fields respectively formed are superimposed in the region sandwiched by the two drive electrodes, thereby becoming a strong magnetic field.

[0164] In addition, when electric field touch detection is performed, the same drive electrode is respectively connected to the signal line TSV in the selection circuit SR-C and the selection circuit SL-C. Thus, with respect to the specified drive electrode, an electric field drive signal (drive signal TSVCOM) is supplied from both end portions thereof, and an electric field corresponding to voltage changes of the electric field drive signal is generated.

[0165] Along the edge 2-U of the display panel 2, a switching adjustment circuit SCX is arranged, and on the edge 2-U side, the switching adjustment circuit SCX is combined with the plurality of signal lines arranged in the display panel 2. That is, the switching adjustment circuit SCX is connected to the plurality of signal lines outside the display panel 2. Further, the amplification circuit AMP is combined with the plurality of signal lines arranged in the display panel 2 via the signal line selector 3 arranged along the edge 2-D of the display panel 2.

[0166] When the magnetic field touch detection is designated by the magnetic field enabling signal SC_EN, the switching adjustment circuit SCX electrically connects between predetermined signal lines arranged in the display panel 2. Thereby, since the signal lines arranged in parallel with each other are connected on the edge 2-U side, the coils of the primary winding of the winding formed of the signal lines are pluralized. The end portions of the respective coils are connected to the amplification circuit AMP via the signal line selector 3 on the edge 2-D side. The coils of the primary winding function as magnetic field detection coils. That is, in the magnetic field detection period TDT( Figure 2 ), a signal change is generated in the magnetic field detection coils formed of the signal lines according to the magnetic field generated by the pen. The signal change is amplified by the amplification circuit AMP and output as the sensing signals S(O) to S(P) to the detection circuit DET.

[0167] Further, when the electric field touch detection, the signal lines are not connected by the switching adjustment circuit SCX, and thus the amplification circuit AMP amplifies the signal change of the signal line according to the change by the touch with the finger, and thereby supplies the sensing signals S(O) to S(P) to the detection circuit DET.

[0168] The detection circuit processes the supplied sensing signals S(O) to S(P) and supplies to the processing circuit PRS. Thereby, when the magnetic field touch detection, the processing circuit PRS outputs the touch with the pen, the touched coordinate, the pen pressure, and the like from the external terminal To. Further, when the electric field touch detection, the processing circuit PRS outputs the touch with the finger, the touched coordinate, and the like from the external terminal To.

[0169] Here, the case where the magnetic field detection coils are the primary winding is described, but not limited thereto, and by providing the same function as the switching adjustment circuit SCX in the amplification circuit AMP, the signal lines of three or more can be connected in series, and the coils of the winding of 1.5 or more times can be formed.

[0170] <Module configuration of display device 1>

[0171] Figure 9 is a schematic plan view showing the entire configuration of the module 900 in which the display device 1 is mounted. Although it is a schematic view, the module 900 is configured by the display device 1, the module 900 is mounted on a housing 901, and the housing 901 is provided with a display portion 902 in which the display device 1 is arranged. Figure 9is depicted in combination with an actual configuration. In this figure, 901 denotes a region in the TFT glass substrate TGB indicated in Figure 4 , 902 denotes a region having the TFT glass substrate TGB and the CF glass substrate CGB indicated in Figure 4 . In the module 900, the TFT glass substrate TGB is integrated. That is, in the region 901 and the region 902, the TFT glass substrate TGB is common, and in the region 902, as shown in Figure 4 , the CF glass substrate CGB or the like is further formed on the upper surface of the TFT glass substrate TGB.

[0172] In Figure 9 , 900-U denotes a short side of the module 900, and 900-D is a side of the module 900, which denotes a short side opposite to the short side 900-U. In addition, 900-L denotes a long side of the module 900, and 900-R is a side of the module 900, which denotes a long side opposite to the long side 900-L.

[0173] In the region 902, and in a region between the side 2-L of the display panel 2 and the long side 900-L of the module 900, the gate driver 5 and the selection drive circuit SSL indicated in Figure 8 are disposed. In addition, in a region between the side 2-R of the display panel 2 and the long side 900-R of the module 900, the selection drive circuit SSR indicated in Figure 8 is disposed. In a region between the side 2-U of the display panel 2 and the short side 900-U of the module 900, the switching adjustment circuit SCX indicated in Figure 8 is disposed.

[0174] In addition, in a region between the side 2-D of the display panel 2 and the short side 900-D of the module 900, the signal line selector 3, the amplification circuit AMP, and the drive semiconductor device DDIC shown in Figure 8 are disposed.

[0175] In this embodiment mode, Figure 8 the signal line driver D-DRV and the control circuit D-CNT shown in Figure 8 are built in one semiconductor device. In this specification, this one semiconductor device is indicated as a drive semiconductor device DDIC. In addition, the touch control device 6 shown in

[0176] is also built in one semiconductor device. In this specification, in order to distinguish from the drive semiconductor device DDIC, the semiconductor device in which the touch control device 6 is built in is also referred to as a touch semiconductor device 6. Of course, the drive semiconductor device DDIC and the touch semiconductor device 6 can also be each composed of a plurality of semiconductor devices. In addition, the amplification circuit AMP can also be built in, for example, the drive semiconductor device DDIC.In this first embodiment, the amplifier circuit AMP is disposed in region 901 and is constructed using wiring and components formed in the TFT glass substrate TGB in region 901. The components include, for example, thin-film transistors (hereinafter also referred to as TFT transistors). Furthermore, when viewed from above, a driving semiconductor device DDIC is mounted on the TFT glass substrate to cover the amplifier circuit AMP. This prevents the lower bezel of the display panel 2 from becoming too large.

[0177] In addition, components constituting the selection drive circuit SSL, SSR, and switching adjustment circuit SCX are also formed on the TFT glass substrate TGB in region 902.

[0178] exist Figure 9 In this text, FB1 and FB2 represent flexible cables. While not specifically limited, flexible cable FB1 includes a touch semiconductor device 6, and flexible cable FB2 includes a connector CN. (The remaining text appears to be incomplete and requires further context.) Figure 8 The sensing signals S(0) to S(p) described herein are supplied to the touch semiconductor device 6 from the amplifier circuit AMP via the connector CN. Furthermore, signal transmission and reception occur between the touch semiconductor device 6 and the driving semiconductor device DDIC via the connector CN. Figure 9 In the example of the transmitted and received signals, the synchronization signal TSHD is depicted.

[0179] In the display panel 2, as described above, there is a pixel arrangement having multiple pixels arranged in a matrix. The pixel arrangement includes multiple driving electrodes TL(0) to TL(p) arranged along the rows of the arrangement, scan lines GL(0) to GL(p), and multiple signal lines SL(0) to SL(p) arranged along the columns of the arrangement. Figure 9 In the example, two driving electrodes TL(n) and TL(m) and two signal wirings SL(k) and SL(n) are represented. It should be noted that in... Figure 9 In this diagram, the scan lines are omitted. Pixels are positioned at the intersections of signal lines SL(0) to SL(p) and scan lines or drive electrodes TL(0) to TL(p). Figure 9 The R, G, and B symbols shown on the four sides of the display panel 2 represent pixels corresponding to the three primary colors.

[0180] Figure 10 This is a top view showing the relationship between the driving electrodes and signal lines included in the display panel 2. The display panel 2 includes driving electrodes TL(0) to TL(p) and signal lines SL(0) to SL(p), but... Figure 10 In this example, these driving electrodes and a portion of the signal lines are exemplified as driving electrodes TL(n-6) to TL(n+9) and signal lines SL(n-6) to SL(n+9). It should be noted that in...Figure 10 The scan lines are omitted in the text.

[0181] If Figure 10 The driving electrodes TL(n-6) to TL(n+9) shown are used as examples to illustrate the driving electrodes. Each driving electrode includes a first electrode and a plurality of second electrodes connected to the first electrode. Here, the first electrode is, for example, a transparent electrode, and the second electrodes are electrodes with a lower thin-film resistivity than the first electrode. Figure 10 In the diagram, one of the multiple second electrodes included in each driving electrode is represented as the auxiliary electrode SM. It should be noted that, to avoid complicating the figures, in... Figure 10 In the figure, only the auxiliary electrodes included in the driving electrodes TL(n-6) and TL(n+9) are marked with the reference numeral SM.

[0182] The auxiliary electrode SM extends in the row direction, similar to the first electrode (transparent electrode) constituting the driving electrode, and is electrically connected to the first electrode. This reduces the combined resistance (impedance) of the driving electrode, including the first electrode and the auxiliary electrode (second electrode). In this specification, unless otherwise specified, the first electrode (transparent electrode) and the second electrode (auxiliary electrode SM) connected to it are collectively referred to as the driving electrode.

[0183] <Display Panel Structure>

[0184] Figure 11 This is a cross-sectional view showing the configuration of the display panel 2 included in the display device 1 according to Embodiment 1. When viewed from the perspective of display, the area of ​​the display panel 2 (first area) is the active area (activated area), the display area where display is performed. In contrast, the area outside the display panel 2 (second area) is the non-display area, which can be considered as the inactive area (inactive area) or peripheral area. If... Figure 9 For example, the active area is the area surrounded by edges 2-U, 2-D, 2-R, and 2-L of the display panel 2.

[0185] Figure 11 express Figure 9 The A-A' section of the display panel 2 is shown. In this first embodiment, for color display, three pixels corresponding to each of the three primary colors R (red), G (green), and B (blue) are used to display one color pixel. That is, it can be considered that one color pixel is composed of three sub-pixels. In this case, during display, the signal line that transmits the color image signal is composed of three signal lines. Figure 11 In order to illustrate the specific structure of the display panel 2, an example of color display is shown.

[0186] In explanationFigure 11 Previously, the reference numerals of the signal lines used in Figure 11 will be described. The signal lines SL(0) to SL(p) respectively indicate signal lines that transfer color image signals during the display period. Each signal line has three signal lines that transfer image signals to three sub-pixels. In Figure 11 , the English alphabets of the corresponding sub-pixels are noted after the reference numerals of the signal lines to distinguish the three signal lines. If an example is taken of the signal line SL(n), the signal line SL(n) has the signal lines SL(n)R, SL(n)G, and SL(n)B. Here, the English alphabet R noted after the reference numeral SL(n) indicates a signal line that transfers an image signal to a sub-pixel corresponding to the red (R) of the three primary colors during the display period, the English alphabet G noted after the reference numeral SL(n) indicates a signal line that transfers an image signal to a sub-pixel corresponding to the green (G) of the three primary colors, and the English alphabet B noted after the reference numeral SL(n) indicates a signal line that transfers an image signal to a sub-pixel corresponding to the blue (B) of the three primary colors.

[0187] In Figure 11 , 1100 indicates a TFT glass substrate (TGB in Figure 4 ). In the TFT glass substrate 1100, a first wiring layer (metal wiring layer) 1101 is formed. The scan line GL(n) is constituted by the wiring formed in the first wiring layer 1101. On the first wiring layer 1101, an insulating layer 1102 is formed, and on the insulating layer 1102, a second wiring layer (metal wiring layer) 1103 is formed. The signal lines SL(n)R, SL(n)G, SL(n)B, the signal lines SL(n+1)R, SL(n+1)G, SL(n+1)B, and the signal lines SL(n+2)R, SL(n+2)G are constituted by the wiring formed in the second wiring layer 1103. In this drawing, in order to indicate that these signal lines are constituted by the second wiring layer 1103, the reference numeral 1103 indicating the second wiring layer is written in [] after the reference numerals of the signal lines. For example, the signal line SL(n)G is indicated as SL(n)G

[1103] .

[0188] An insulating layer 1104 is formed on the second wiring layer 1103, and a third wiring layer (metal wiring layer) 1105 is formed on the insulating layer 1104. The drive electrode TL(n) and the auxiliary electrode SM are constituted by the wiring formed in the third wiring layer 1105. Here, the drive electrode TL(n) is a transparent electrode (first electrode). In addition, the auxiliary electrode SM (second electrode) is formed to have a lower resistance value than the drive electrode TL(n) and is electrically connected to the drive electrode TL(n). The resistance value of the drive electrode TL(n) as a transparent electrode is relatively high, but by electrically connecting the auxiliary electrode SM to the drive electrode TL(n), the resultant resistance can be reduced. Here, the reference numeral

[1105] attached to the drive electrode and the auxiliary electrode also indicates that they are constituted by the third wiring layer 1105.

[0189] An insulating layer 1106 is formed on the third wiring layer 1105, and a pixel electrode LDP is formed on the upper surface of the insulating layer 1106. Figure 11 Here, CR, CB, and CG are color filters. The color filters CR (red), CG (green), and CB (blue) are separated from the insulating layer 1106 by a liquid crystal layer 1107. Here, the pixel electrode LDP is provided at the intersection of the scan line and the signal line, and the color filter CR, CG, or CB corresponding to each pixel electrode LDP is provided above each pixel electrode LDP. A black matrix BM is provided between the color filters CR, CG, and CB.

[0190] In addition, in Figure 11 , the color filters CR, CG, and CB are omitted, and as shown in Figure 4 and Figure 6 , a CF glass substrate CGB is formed on the color filters CR, CG, and CB. Furthermore, as shown in Figure 4 , detection electrodes RL(0) to RL(p) and a polarizing plate are formed on the CF glass substrate CGB.

[0191] <Pixel Arrangement>

[0192] Next, the circuit configuration of the display panel 2 will be described. Figure 12 is a circuit diagram showing the circuit configuration of the display panel 2 shown in Figure 8 and Figure 9 . Even in Figure 12 , the same reference numerals as in Figure 11The same display form indicates the signal line. In this drawing, a plurality of SPix indicated by a single-dot chain line respectively indicates a liquid crystal display element (sub-pixel). The sub-pixels SPix are arranged in a matrix form in the display panel 2, and constitute a liquid crystal element array (pixel array) LCD. The pixel array LCD includes a plurality of scan lines GL(0) to GL(p) arranged in each row and extending in the row direction, and signal lines SL(0)R, SL(0)G, SL(0)B to SL(p)R, SL(p)G, SL(p)B arranged in each column and extending in the column direction. Further, the pixel array LCD has drive electrodes TL(0) to TL(p) arranged in each row and extending in the row direction.

[0193] In Figure 12 , only a portion of the pixel array relating to the scan lines GL(n-1) to GL(n+1), the signal lines SL(n)R, SL(n)G, SL(n)B to SL(n+1)R, SL(n+1)G, SL(n+1)B, and the drive electrodes TL(n-1) to TL(n+1) is indicated. In Figure 12 , the drive electrodes TL(n-1) to TL(n+1) are indicated as being arranged in each row for ease of explanation, but one drive electrode can be arranged for a plurality of rows.

[0194] Each sub-pixel SPix arranged at the intersection of the row and the column of the pixel array LCD includes a TFT transistor Tr formed in the TFT glass substrate 1100, and a liquid crystal element LC having one terminal connected to the source of the TFT transistor Tr. In the pixel array LCD, the gate of the TFT transistor Tr of a plurality of sub-pixels SPix arranged in the same row is connected to the scan line arranged in the same row, and the drain of the TFT transistor Tr of a plurality of sub-pixels SPix arranged in the same column is connected to the signal line arranged in the same column. In other words, a plurality of sub-pixels SPix are arranged in a matrix form, in each row, a scan line is arranged, and a plurality of sub-pixels SPix arranged in the corresponding row are connected to the scan line. Further, in each column, a signal line is arranged, and the sub-pixels SPix arranged in the corresponding column are connected to the signal line. Further, the other terminal of the liquid crystal element LC of a plurality of sub-pixels SPix arranged in the same row is connected to the drive electrode arranged in the row.

[0195] If the Figure 12To illustrate with the example shown, in this diagram, the gates of the TFT transistors Tr of each of the multiple sub-pixels SPix arranged in the top row are connected to the scan line GL(n-1) arranged in the top row. Furthermore, in this diagram, the drains of the TFT transistors Tr of each of the multiple sub-pixels SPix arranged in the leftmost column are connected to the signal line SL(n)R arranged in the leftmost column. Moreover, the other end of the liquid crystal element LC of each of the multiple sub-pixels SPix arranged in the top row is... Figure 12 In the middle, it is connected to the drive electrode TL(n-1) configured in the top row.

[0196] As described above, each sub-pixel SPix corresponds to one of the three primary colors. Therefore, the three primary colors R, G, and B are formed by three sub-pixels SPix. Figure 12 In the same row, three consecutively arranged sub-pixels SPix form a color pixel Pix, which represents color. That is, in Figure 12 In this design, the sub-pixel SPix denoted as 1200R becomes the R (red) sub-pixel SPix(R), the sub-pixel SPix denoted as 1200G becomes the G (green) sub-pixel SPix(G), and the sub-pixel SPix denoted as 1200B becomes the B (blue) sub-pixel SPix(B). Therefore, in the sub-pixel SPix(R) denoted as 1200R, a red color filter CR is provided as a color filter; in the sub-pixel SPix(G) denoted as 1200G, a green color filter CG is provided as a color filter; and in the sub-pixel SPix(B) denoted as 1200B, a blue color filter CB is provided as a color filter.

[0197] In addition, the signal line selector 3 supplies the image signal corresponding to R (red) in the signal representing a pixel to the signal line SL(n)R, the signal line selector 3 supplies the image signal corresponding to G (green) to the signal line SL(n)G, and the signal line selector 3 supplies the image signal corresponding to B (blue) to the signal line SL(n)B.

[0198] Although not specifically restricted, the TFT transistor Tr in each sub-pixel SPix is ​​an N-channel TFT transistor. For scan lines GL(0) to GL(p), from the gate driver 5 ( Figure 8 and Figure 9), a pulse-shaped scan line signal which becomes a high level in accordance with the order, for example, is supplied. That is, in the pixel array LCD, from the scan line GL(0) arranged in the upper stage row toward the scan line GL(p) arranged in the lower stage row, the voltage of the scan line becomes a high level in order. Thereby, in the pixel array LCD, from the sub-pixel SPix arranged in the upper stage row toward the sub-pixel SPix arranged in the lower stage row, the TFT transistor Tr in the sub-pixel SPix becomes an on (conducting) state in order.

[0199] By the TFT transistor Tr becoming an on state, the image signal supplied at this time to the signal line is supplied to the liquid crystal element LC via the on state TFT transistor. In the liquid crystal element LC, from the voltage difference between the voltage of the display drive signal supplied to the drive electrode TL(0) ~ TL(p) and the voltage of the supplied image signal, the electric field changes, and the modulation of the light which transmits through the liquid crystal element LC changes. Thereby, in synchronization with the scan line signal supplied to the scan line GL(0) ~ GL(p), the color image corresponding to the image signal supplied to the signal line SL(0)R, SL(0)G, SL(n)B ~ SL(p)R, SL(p)G, SL(p)B is displayed in the display panel 2.

[0200] The plurality of sub-pixels SPix can be considered as each having a selection terminal and a pair of terminals. In this case, the gate of the TFT transistor Tr constituting the sub-pixel SPix is the selection terminal of the sub-pixel SPix, the drain of the TFT transistor Tr is one of the pair of terminals, and the other terminal of the liquid crystal element LC is the other terminal of the sub-pixel SPix.

[0201] Here, if the configuration of the display panel 2 shown in Figure 8 and Figure 9 is described, and the correspondence to the circuit diagram shown in Figure 12 is described, the following is described.

[0202] The pixel array LCD has a pair of edges substantially parallel to the rows arranged thereby, and a pair of edges substantially parallel to the columns arranged thereby. The pair of edges parallel to the rows of the pixel array LCD is a first edge, a second edge corresponding to the short edges 2-U, 2-D of the display panel 2 shown in Figure 8 and Figure 9 , and the pair of edges parallel to the columns of the pixel LCD is a third edge, a fourth edge corresponding to the long edges 2-L, 2-R of the display panel 2.

[0203] In the pixel array LCD, along the second edge of the pair of edges parallel to the rows, that is, the one short edge 2-D of the display panel 2, as shown in Figure 9As shown, a signal selector 3, an amplifier AMP, and a semiconductor device for driving DDIC are arranged. In the pixel array LCD, in the second side (short side 2-D of the liquid crystal panel 2), via the signal line selector 3, the signal lines SL(0)R, SL(0)G, SL(0)B ~ SL(p)R, SL(p)G, SL(p)B are supplied with the image signals from the semiconductor device for driving DDIC.

[0204] In addition, along the first side of the pixel array LCD, that is, the other side (short side 2-U) of the display panel 2, as shown in Figure 9 A switching adjustment circuit SCX is arranged.

[0205] In the pixel array LCD, along the third side of the pair of sides parallel to the columns (third side, fourth side), that is, the long side 2-L of the display panel 2, a gate driver 5 and a selection drive circuit SSL are arranged. In the pixel array LCD, in the third side, the scan lines GL(0) ~ GL(p) are supplied with the scan line signals from the gate driver 5. In Figure 9 In the pixel array LCD, along the third side of the pair of sides parallel to the columns (third side, fourth side), that is, the long side 2-L of the display panel 2, a gate driver 5 and a selection drive circuit SSL are arranged. In the pixel array LCD, in the third side, the scan lines GL(0) ~ GL(p) are supplied with the scan line signals from the gate driver 5. In

[0206] Along the fourth side of the pixel array LCD, that is, the long side 2-R of the display panel 2, as shown in Figure 9 A selection drive circuit SSR is arranged. In the display period, in the fourth side, the display drive signals are supplied from the selection drive circuit SSR to the common electrode. On the other hand, in the magnetic field touch detection or the electric field touch detection, similarly to the selection drive circuit SSL described above, from the fourth side side, the magnetic field drive signals or the electric field drive signals are also supplied to the designated drive electrodes.

[0207] Although the pixel arrangement LCD in which color display is performed in the display panel 2 is specifically described, it can also be considered that the pixel arrangement LCD is configured by a plurality of color pixels Pix (pixels) each composed of three sub-pixels SPix. In this case, the pixel arrangement LCD is configured by arranging a plurality of pixels Pix in a matrix. In each row of the pixel arrangement LCD composed of the pixels Pix, a corresponding scan line GL(0) to GL(p) and a corresponding drive electrode TL(0) to TL(p) are arranged, and in each column, a signal line SL(0) to SL(p) is arranged.

[0208] In this case, the three sub-pixels SPix are considered as one pixel Pix, and the pixel Pix is considered to have the same configuration as the sub-pixel SPix. In each of the pixels Pix arranged in a matrix in the pixel arrangement LCD, a selection terminal is connected to the scan line GL(0) to GL(p) arranged in the same row as the pixel Pix, one terminal of the pixel Pix is connected to the signal line SL(0) to SL(p) arranged in the same column, and the other terminal of the pixel Pix is connected to the drive electrode TL(0) to TL(p) arranged in the same column. Of course, one drive electrode can correspond to a plurality of rows of the pixel arrangement LCD. In this case, the other terminal of the pixel Pix arranged in a plurality of rows is connected to a common drive electrode.

[0209] Thus, even in the case where the pixel arrangement LCD is considered to be composed of a plurality of pixels Pix, Figure 8 and Figure 9 the configuration of the display panel 2 shown in Figure 12 corresponds to the circuit diagram shown in

[0210] The number of sub-pixels SPix constituting one color pixel Pix is three, but is not limited thereto, and for example, a sub-pixel of an arbitrary color or a plurality of colors in addition to the above-described R, G, B, or a complementary color (cyan (C), magenta (M), yellow (Y)) of the above-described R, G, and B can be added to constitute one color pixel.

[0211] <Selection Drive Circuit>

[0212] Next, the configuration and operation of the selection drive circuit SSL, SSR in the display device 1 according to Embodiment 1 will be described with reference to Figures 13-18

[0213] <<Outline of Operation of Selection Drive Circuit>>

[0214] ​To facilitate understanding of the selection of the drive circuit, a summary of the operation will first be provided. In Implementation Method 1, the drive circuit SSR is selected as follows: Figure 8 As shown, the system includes a drive circuit SR-R and a selection circuit SR-C. During the magnetic field generation period TGT in magnetic field touch detection, the drive circuit SR-R generates a selection signal specifying the drive electrode that generates the strong magnetic field. Additionally, during electric field touch detection, the drive circuit SR-R generates a selection signal specifying the drive electrode that generates the electric field. During the magnetic field generation period TGT, the selection circuit SR-C connects the drive electrode, which is clamped to the selected drive electrode, to the signal wiring TSV and the voltage wiring VCOM, in a manner that generates the magnetic field in the drive electrode specified by the selection signal. Furthermore, during electric field touch detection, the selection circuit SR-C connects to the signal wiring TSV via the drive electrode specified by the selection signal.

[0215] The driving circuit SR-R includes multiple unit driving circuits USR(0) to USR(p), each with a shift segment. These unit driving circuits USR(0) to USR(p) are connected in series to form a shift register. During magnetic field touch detection and electric field touch detection, the selection information specifying the selected driving electrode is moved in the shift register composed of multiple unit driving circuits, thereby generating a selection signal for sequentially specifying the driving electrode in the driving circuit SR-R.

[0216] The selection drive circuit SSL, like the selection drive circuit SSR, includes a drive circuit SL-R and a selection circuit SL-C. The drive circuit SL-R, like the drive circuit SR-R, includes multiple unit drive circuits USL(0) to USL(p). It operates in the same manner as the drive circuit SR-R. Furthermore, the selection circuit SL-C operates in the same manner as the selection circuit SR-C.

[0217] Figure 13 This is an explanatory diagram illustrating the touch detection operation in the display device 1 according to Embodiment 1. Figure 13 (A) indicates that the touch detection action is an electric field touch detection. Figure 13 (B) indicates that the touch detection action is a magnetic field touch detection case. To illustrate the action summary, in Figure 13 In the figure, the unit drive circuit USR(n) among the multiple unit drive circuits USR(0) to USR(p) constituting the drive circuit SR-R and the unit drive circuit USL(n) among the multiple unit drive circuits USL(0) to USL(p) constituting the drive circuit SL-R are depicted, and the selection circuits SR-C and SL-C are omitted.

[0218] Each of the unit drive circuits USR(0) to USR(p) and USL(0) to USL(p) corresponds to each of the drive electrodes TL(0) to TL(p) arranged in parallel with each other, but the unit drive circuits and the drive electrodes can not correspond one to one. That is, a plurality of drive electrodes arranged adjacent to each other can correspond to a unit drive circuit. In Figure 13 , an example in which six drive electrodes correspond to a unit drive circuit is shown. That is, six drive electrodes TL(n)-l to TL(n)-6 arranged adjacent to each other are regarded as one drive electrode TL(n) and correspond to the unit drive circuits USR(n) and USL(n).

[0219] In the electric field touch detection, if the unit drive circuits USR(n) and USL(n) form a selection signal that specifies the corresponding drive electrode TL(n), one end of the specified drive electrode TL(n), that is, one end of each of the six drive electrodes TL(n)-l to TL(n)-6 is connected to the signal wiring TSV on the side of the edge 2-L( Figure 8 , Figure 9 ). Further, the other end of the specified drive electrode TL(n), that is, the other end of each of the six drive electrodes TL(n)-l to TL(n)-6 is connected to the signal wiring TSV on the side of the edge 2-R( Figure 8 , Figure 9 ). When the electric field touch detection, the drive signal TSVCOM that periodically changes in voltage is supplied to the signal wiring TSV, and thus the drive signal TSVCOM is supplied to both ends of the drive electrode TL(n), that is, both ends of the six drive electrodes TL(n)-l to TL(n)-6 as an electric field drive signal. As a result, an electric field is generated in accordance with the electric field drive signal (the drive signal TSVCOM).

[0220] On the other hand, in the magnetic field generation period TGT of the magnetic field touch detection, if the unit drive circuits USR(n) and USL(n) form a selection signal that specifies the corresponding drive electrode TL(n), the drive electrodes TL(n-l) and TL(n+l) arranged so as to sandwich the specified drive electrode TL(n), that is, the six drive electrodes TL(n)-l to TL(n)-6 are connected to the signal wiring TSV and the voltage wiring VCOM. The drive electrode TL(n-l) is constituted by the six drive electrodes TL(n-l)-l to TL(n-l)-6, and the drive electrode TL(n+l) is also constituted by the six drive electrodes TL(n+l)-l to TL(n+l)-6. In Figure 13In this context, only the driving electrodes TL(n-1)-5, TL(n-1)-6, TL(n+1)-1, and TL(n+1)-2 are represented, while the remaining driving electrodes TL(n-1)-1 to TL(n-1)-4 and TL(n+1)-3 to TL(n+1)-6 are omitted.

[0221] If we Figure 13 Taking the driving electrodes TL(n-1)-5, TL(n-1)-6, TL(n+1)-1, and TL(n+1)-2 as examples, one end of each of the driving electrodes TL(n-1)-5 and TL(n-1)-6 is on side 2-L and connected to the signal wiring TSV. Similarly, one end of each of the driving electrodes TL(n+1)-1 and TL(n+1)-2 is on side 2-L and connected to the voltage wiring VCOM. At this time, the other end of each of the driving electrodes TL(n-1)-5 and TL(n-1)-6 is on side 2-R and connected to the voltage wiring VCOM, and the other end of each of the driving electrodes TL(n+1)-1 and TL(n+1)-2 is on side 2-R and connected to the signal wiring TSV. Similarly, one end of each of the drive electrodes TL(n-1)-1 to TL(n-1)-4 (not shown) is also on side 2-L and connected to the signal wiring TSV, while the other end of each is on side 2-R and connected to the voltage wiring VCOM. Additionally, one end of each of the drive electrodes TL(n+1)-3 to TL(n+1)-6 (not shown) is on side 2-L and connected to the voltage wiring VCOM, while the other end of each is on side 2-R and connected to the signal wiring TSV.

[0222] During the magnetic field generation period TGT of magnetic field touch detection, a periodically varying drive signal TSVCOM is supplied to the signal wiring TSV, and a ground voltage Vss is supplied to the voltage wiring VCOM. Therefore, as Figure 13 As shown, in the drive electrodes TL(n-1) and TL(n+1) arranged apart from the designated drive electrode TL(n), a current represented by arrow I1 flows through drive electrode TL(n-1), and in drive electrode TL(n+1), a current I2 flows in the opposite direction to current I1, as indicated by arrow. That is, in the drive electrodes TL(n-1) and TL(n+1) arranged apart from the designated drive electrode TL(n), currents flow in opposite directions according to the voltage change of the magnetic field drive signal (drive signal TSVCOM). Therefore, in the region where drive electrode TL(n) is arranged, the magnetic field generated in drive electrode TL(n-1) and the magnetic field generated in drive electrode TL(n+1) are superimposed, generating a strong magnetic field.

[0223] In addition,Figure 13 In the example shown, the six drive electrodes TL(n-1)-1 to TL(n-1)-6 are bundled to become the drive electrode TL(n-1), and the magnetic field generated in the drive electrode TL(n-1) becomes strong. Similarly, the six drive electrodes TL(n+1)-1 to TL(n+1)-6 are bundled to become the drive electrode TL(n+1), and the magnetic field generated in the drive electrode TL(n+1) becomes strong. As a result, the superimposed magnetic field can be further strengthened.

[0224] Thus, even if the drive electrode TL(n-1) and the drive electrode TL(n+1) that are arranged in parallel with each other are not connected in series to form a coil, a strong magnetic field can be generated. As a result, control becomes easy, and an increase in the occupied area of the control circuit can be suppressed.

[0225] <<Configuration of selection drive circuit>>

[0226] Figure 14 is a block diagram showing the configuration of the selection drive circuit SSL and the selection drive circuit SSR according to Embodiment 1. The selection drive circuit SSL and the selection drive circuit SSR have similar configurations to each other. First, the configuration of the selection drive circuit SSL will be described, and regarding the selection drive circuit SSR, mainly the points of difference from the selection drive circuit SSL will be described.

[0227] The selection drive circuit SSL includes a drive circuit SL-R and a selection circuit SL-C, as shown in Figure 8 . The drive circuit SL-R includes a plurality of unit drive circuits USL(0) to USL(p) corresponding to the drive electrodes TL(0) to TL(p), respectively, and the selection circuit SL-C includes a plurality of third switches and fourth switches corresponding to the drive electrodes TL(0) to TL(p), respectively, and a switch control circuit SWL. In Figure 14 , the drive electrodes TL(n) to TL(n+5) among the drive electrodes TL(0) to TL(p) are shown, and the portion of the selection drive circuit SSL corresponding to these drive electrodes TL(n) to TL(n+5) is shown. Hereinafter, the selection drive circuit SSL will be described taking the portion corresponding to the drive electrodes TL(n) to TL(n+5) as an example.

[0228] In Figure 14In the figure, USL(n)~USL(n+5) are unit drive circuits corresponding to the drive electrodes TL(n)~TL(n+5). The unit drive circuits USL(n)~USL(n+5) each include a shift section. The shift sections of the unit drive circuits USL(n)~USL(n+5) are connected in series to form a shift register. During the magnetic field generation period TGT and during the electric field touch detection period, a selection information SEI is supplied to the unit drive circuit USL(n) from the unit drive circuit USL(n) of the front section of the unit drive circuits USL(n)~USL(n+5) (not shown). The selection information SEI is shifted in the shift register formed by the shift sections of the unit drive circuits USL(n)~USL(n+5) in synchronization with a clock signal CLK, and moves from the unit drive circuit USL(n) toward the unit drive circuit USL(n+5). Further, when the selection information SEI moves, a selection signal is outputted from the unit drive circuits USL(n)~USL(n+5) to the switch control circuit SWL, respectively.

[0229] The switch control circuit SWL receives the selection signal from the unit drive circuits USL(n)~USL(n+5), the magnetic field enable signal SC_EN, and the electric field enable signal TC_EN, and forms a first drive signal for switching control of the third switches STLn~STLn+5 and a second drive signal for switching control of the fourth switches SVLn~SVLn+5.

[0230] The third switches STLn~STLn+5 and the fourth switches SVLn~SVLn+5 each correspond to the drive electrodes TL(n)~TL(n+5) respectively. For example, the third switch STLn and the fourth switch SVLn correspond to the drive electrode TL(n), and the third switch STLn+5 and the fourth switch SVLn+5 correspond to the drive electrode TL(n+5). The remaining third switches and fourth switches each also correspond to the drive electrodes one-to-one in the same manner.

[0231] The third switches STLn to STLn+5 are connected between the signal line TSV and one end of the corresponding drive electrode TL(n) to TL(n+5) on the side 2-L of the display panel 2, and are switched by the first drive signal. Further, the fourth switches SVLn to SVLn+5 are connected between the voltage line VCOM and one end of the corresponding drive electrode TL(n) to TL(n+5) on the side 2-L of the display panel 2, and are switched by the second drive signal. If the third switches STLn, STLn+5 and the fourth switches SVLn, SVLn+5 are exemplified, the third switch STLn is connected between the signal line TSV and one end of the drive electrode TL(n) on the side 2-L, and the fourth switch SVLn is connected between the voltage line VCOM and one end of the drive electrode TL(n) on the side 2-L. Further, the third switch STLn+5 is connected between the signal line TSV and one end of the drive electrode TL(n+5) on the side 2-L, and the fourth switch SVLn+5 is connected between the voltage line VCOM and one end of the drive electrode TL(n+5) on the side 2-L. The remaining third switches and fourth switches are the same.

[0232] In this embodiment, the third switches STLn to STLn+5, the fourth switches SVLn to SVLn+5, and the switch control circuit SWL constitute a selection circuit SL-C as shown in FIG. 6. Figure 8

[0233] In the selection drive circuit SSR, USR(n) to USR(n+5) are unit drive circuits corresponding to the unit drive circuits USL(n) to USL(n+5) described above, and SWR is a switch control circuit corresponding to the switch control circuit SWL described above. Further, STRn to STRn+5 are fifth switches corresponding to the third switches STLn to STLn+5 described above, and SVRn to SVRn+5 are sixth switches corresponding to the fourth switches SVLn to SVLn+5 described above.

[0234] ​The shift section in the unit drive circuit USR(n) ~ USR(n+5) is connected in series, and the selection information SEI is moved from the unit drive circuit USR(n) toward USR(n+5) in synchronization with the clock signal CLK. At the time of the movement, the selection information SEI stored in the unit drive circuits USR(n) ~ USR(n+5) is outputted to the switch control circuit SWR as the selection signal of the unit drive circuits USR(n) ~ USR(n+5). The switch control circuit SWR receives the selection signal from the unit drive circuits USR(n) ~ USR(n+5), the magnetic field enable signal SC_EN, and the electric field enable signal TC_EN, and forms a third drive signal for switching control of the fifth switches STRn ~ STRn+5 and a fourth drive signal for switching control of the sixth switches SVLn ~ SVLn+5.

[0235] The drive circuit SR-R composed of the unit drive circuits USR(n) ~ USR(n+5) and the selection circuit SR-C composed of the fifth switches, the sixth switches, and the switch control circuit SWR are arranged along the side 2-R of the display panel 2 as shown in FIG. 6. Therefore, the fifth switches STRn ~ STRn+5 are connected between the signal wiring TSV and the other end of the corresponding drive electrode TL(n) ~ TL(n+5), respectively, on the side 2-R. Further, the sixth switches SVRn ~ SVRn+5 are connected between the voltage wiring VCOM and the other end of the corresponding drive electrode TL(n) ~ TL(n+5), respectively, on the side 2-R. Figure 8

[0236] If the fifth switches STRn, STRn+5 and the sixth switches SVRn, SVRn+5 are exemplified, the fifth switch STRn is connected between the signal wiring TSV and the other end of the drive electrode TL(n) on the side 2-R, and the sixth switch SVRn is connected between the voltage wiring VCOM and the other end of the drive electrode TL(n) on the side 2-R. Further, the fifth switch STRn+5 is connected between the signal wiring TSV and the other end of the drive electrode TL(n+5) on the side 2-R, and the sixth switch SVRn+5 is connected between the voltage wiring VCOM and the other end of the drive electrode TL(n+5) on the side 2-R. The same applies to the remaining fifth switches and the sixth switches.

[0237] In the magnetic field touch detection, the periodically varying drive signal TSVCOM is supplied to the signal wiring TSV during the magnetic field generation period TGT. Further, at this time, the ground voltage Vss is supplied to the voltage wiring VCOM. Figure 15 ​is a waveform chart showing waveforms of voltages supplied to the signal wiring TSV and the voltage wiring VCOM in the TGT during the magnetic field generation. In Figure 15 the horizontal axis represents time t, and the vertical axis represents voltage. Figure 15 (A) of FIG. 10 shows a waveform of the drive signal TSVCOM supplied to the signal wiring TSV disposed in the selection circuit SL-C, Figure 15 (B) of FIG. 10 shows a waveform of the drive signal TSVCOM supplied to the signal wiring TSV disposed in the selection circuit SR-C. In addition, Figure 15 (C) of FIG. 10 shows a voltage waveform of the voltage wiring VCOM disposed in the selection circuits SL-C, SR-C.

[0238] As shown in Figure 15 the drive signal TSVCOM supplied to the selection circuit SL-C and the drive signal TSVCOM supplied to the selection circuit SR-C are synchronized with each other, and each voltage value periodically changes between the ground voltage Vss and a predetermined voltage (first voltage) Vp. In contrast, the ground voltage Vss is supplied to the voltage wiring VCOM.

[0239] When the electric field touch detection, as shown in Figure 15 (A) and (B) of FIG. 11, a drive signal synchronized with each other is also supplied to the signal wiring TSV disposed in the selection circuit SL-C and the signal wiring TSV disposed in the selection circuit SR-C. Although not particularly limited, the predetermined voltage Vp in the drive signal TSVCOM is different between the magnetic field generation period TGT and the electric field touch detection. In addition, Figure 15 the period of the drive signal TSVCOM shown in (A) and (B) of FIG. 11 is also different between the magnetic field generation period TGT and the electric field touch detection period. Of course, the predetermined voltage Vp and the period are not limited thereto, and can be the same.

[0240] The switch control circuits SWL, SWR perform different actions in a case where the magnetic field touch detection is designated by the magnetic field enable signal SC_EN and in a case where the electric field touch detection is designated by the electric field enable signal TC_EN. Using Figure 16 and Figure 17 the action in the case where the magnetic field touch detection is designated is described using Figure 18 the action in the case where the electric field touch detection is designated is described.

[0241] <<Action of Magnetic Field Generation>>

[0242] Figure 16 and Figure 17 are schematic plan views showing the action in the case where the magnetic field touch detection is designated.

[0243] The switch control circuit SWL controls the third switch and the fourth switch in such a manner that the two driving electrodes, which are arranged in a manner that they are across the driving electrodes corresponding to the unit drive circuit outputting the selection signal indicating selection, are connected to the signal wiring TSV and the voltage wiring VCOM, in a case where the selection signal supplied from the unit drive circuit indicates selection. Although not particularly limited, in this Embodiment 1, the switch control circuit SWL controls the third switch so that the driving electrode close to the side 2-U among the two driving electrodes is connected to the signal wiring TSV, and the switch control circuit SWL controls the fourth switch so that the driving electrode close to the side 2-D is connected to the voltage wiring VCOM.

[0244] The switch control circuit SWR also controls the sixth switch and the fifth switch in such a manner that the two driving electrodes, which are arranged in a manner that they are across the driving electrodes corresponding to the unit drive circuit outputting the selection signal indicating selection, are connected to the voltage wiring VCOM and the signal wiring TSV, in a case where the selection signal supplied from the unit drive circuit indicates selection. In this Embodiment 1, the switch control circuit SWR controls the sixth switch so that the driving electrode close to the side 2-U among the two driving electrodes is connected to the voltage wiring VCOM, and the switch control circuit SWL controls the fifth switch so that the driving electrode close to the side 2-D is connected to the signal wiring TSV.

[0245] The shift register constituted by the unit drive circuits USL(n) to USL(n+5) and the shift register constituted by the unit drive circuits USR(n) to USR(n+5) act in synchronization with each other. Therefore, in the driving electrode whose one end is connected to the signal wiring TSV by the switch control circuit SWL, the other end is connected to the voltage wiring VCOM by the switch control circuit SWR. Also, in the driving electrode whose other end is connected to the signal wiring TSV by the switch control circuit SWR, the one end is connected to the voltage wiring VCOM by the switch control circuit SWL.

[0246] In Figure 15In this case, the state when the unit drive circuit USL(n+2) and the unit drive circuit USR(n+2) output the selection signal indicating the selection is indicated. The drive electrode corresponding to the unit drive circuit USL(n+2), USR(n+2) is the drive electrode TL(n+2), and thus the two drive electrodes arranged across the drive electrode TL(n+2) become the drive electrode TL(n+1) and the drive electrode TL(n+3). The switch control circuit SWL brings the third switch STLn+1 into the on state by the first drive signal to connect the end portion of the drive electrode TL(n+1) arranged in the vicinity of the side 2-U to the signal wiring TSV. At this time, the switch control circuit SWL brings the fourth switch SVLn+3 into the on state by the second drive signal to connect the end portion of the drive electrode TL(n+3) arranged in the vicinity of the side 2-D to the voltage wiring VCOM.

[0247] In addition, at this time, the switch control circuit SWL controls by the first drive signal to bring the remaining third switches STLn, STLn+2 to STLn+5 other than the third switch STLn+1 into the off state. Similarly, the switch control circuit SWL controls by the second drive signal to bring the remaining fourth switches SVLn to SVLn+2, SVLn+4 to SVLn+5 other than the fourth switch SVLn+3 into the off state.

[0248] On the other hand, the switch control circuit SWR brings the sixth switch SVRn+1 into the on state by the fourth drive signal in such a manner that the other end portion of the drive electrode TL(n+1) of the two drive electrodes arranged in the vicinity of the side 2-U is connected to the voltage wiring VCOM. At this time, the switch control circuit SWR brings the fifth switch STRn+3 into the on state by the third drive signal in such a manner that the other end portion of the drive electrode TL(n+3) arranged in the vicinity of the side 2-D is connected to the signal wiring TSV.

[0249] In addition, at this time, the switch control circuit SWR controls by the third drive signal to bring the remaining fifth switches STRn to STRn+2, STRn+4 to STRn+5 other than the fifth switch STRn+3 into the off state. Similarly, the switch control circuit SWR controls by the fourth drive signal to bring the remaining sixth switches SVRn, SVRn+2 to SVRn+5 other than the sixth switch SVRn+1 into the off state.

[0250] Thus, one end of the drive electrode TL(n+1) of one of the two drive electrodes arranged so as to sandwich the drive electrode TL(n+2) is connected to the signal wiring TSV, and the other end is connected to the voltage wiring VCOM. At this time, in the other drive electrode TL(n+3), one end is connected to the voltage wiring VCOM, and the other end is connected to the signal wiring TSV. As shown in FIG. 10, by supplying the drive signal TSVCOM, in which the voltage value periodically changes, to the signal wiring TSV, and supplying the ground voltage Vss to the voltage wiring VCOM, in the drive electrode TL(n+1), the current I1, which is indicated by an arrow, flows. Figure 16 Figure 17 In the drive electrode TL(n+3), the current I2, which is indicated by an arrow, flows.

[0251] By flowing the current I1, in the drive electrode TL(n+1), the magnetic field H1, which is indicated by a dotted arrow, is generated. On the other hand, by flowing the current I2, which is in the opposite direction to the current I1, in the drive electrode TL(n+3), in the drive electrode TL(n+3), the magnetic field H2, which is indicated by a dotted arrow, is generated. The drive electrode TL(n+2) is sandwiched between the drive electrodes TL(n+1) and TL(n+3), and thus in the region of this drive electrode TL(n+2), the magnetic field H1 and the magnetic field H2 overlap, and thus a strong magnetic field is generated. At this time, the drive electrodes TL(n), TL(n+2), TL(n+4), and TL(n+5), other than the drive electrodes TL(n+1) and TL(n+3), are in a floating state, respectively.

[0252] The selection information SEI, which indicates the selection, is changed by the shift clock CLK, and thus is moved from the unit drive circuits USL(n+2), USR(n+2) to the unit drive circuits USL(n+3), USR(n+3). By this movement, the region from which the strong magnetic field is generated is moved from the drive electrode TL(n+2) to the region of the drive electrode TL(n+3). Figure 17 The state in which the strong magnetic field is generated in the drive electrode TL(n+3) is indicated.

[0253] ​The selection information SEI is moved to the unit drive circuits USL(n+3), USR(n+3) by the change of the clock signal CLK, thereby indicating the selection. The drive electrodes corresponding to the unit drive circuits USL(n+3), USR(n+3) are the drive electrodes TL(n+3). Therefore, the switch control circuits SWL, SWR connect the drive electrodes TL(n+2) disposed closer to the side 2-U than the drive electrodes TL(n+3) to the signal wiring TSV and the voltage wiring VCOM. Also at this time, the switch control circuits SWL, SWR connect the drive electrodes TL(n+4) disposed closer to the side 2-D than the drive electrodes TL(n+3) to the voltage wiring VCOM and the signal wiring TSV. That is, the switch control circuit SWL makes the third switch STLn+2 an on state by the first drive signal, makes the fourth switch SVLn+4 an on state by the second drive signal, and makes the remaining third and fourth switches off states. Also, the switch control circuit SWR makes the fifth switch SVRn+2 an on state by the third drive signal, makes the sixth switch STRn+4 an on state by the fourth drive signal, and makes the remaining fifth and sixth switches off states.

[0254] As a result, one end of the drive electrode TL(n+2) is connected to the signal wiring TSV via the third switch STLn+2, and the other end is connected to the voltage wiring VCOM via the fifth switch SVRn+2. At this time, one end of the drive electrode TL(n+4) is connected to the voltage wiring VCOM via the fourth switch SVLn+4, and the other end is connected to the signal wiring TSV via the sixth switch SVRn+2. If the drive signal TSVCOM is supplied to the signal wiring TSV, and the ground voltage Vss is supplied to the voltage wiring VCOMDC, then in the drive electrode TL(n+2), a current I1 flows in the direction indicated by the arrow, and in the drive electrode TL(n+4), a current I2 flows in the direction indicated by the arrow. Figure 18

[0255] By the flow of the currents I1, I2, in the drive electrode TL(n+2), a magnetic field as indicated by the dotted arrow is generated, and in the drive electrode TL(n+4), a magnetic field as indicated by the dotted arrow is generated. In the region of the drive electrode TL(n+3), the magnetic field and the magnetic field overlap, thereby generating a strong magnetic field. Also at this time, the drive electrodes TL(n), TL(n+1), TL(n+3), and TL(n+5) other than the drive electrodes TL(n+2) and TL(n+4) become floating states, respectively.

[0256] ​As described above, the selection information SEI indicating the selection is moved from the unit drive circuits USL(n), USR(n) to the unit drive circuits USL(n+5), USR(n+5), so that the magnetic field is sequentially generated from the side 2-U toward the side 2-D. In this case, even if the magnetic field generating coil is not constituted by connecting the drive electrodes, a strong magnetic field can be generated.

[0257] <<Action of electric field generation>>

[0258] In a case where the electric field touch detection is instructed by the electric field enable signal TC_EN, the switch control circuits SWL, SWR control the third switches and the fifth switches in a manner that the drive electrodes corresponding to the unit drive circuits outputting the selection signal indicating the selection are connected to the signal wiring TSV when the selection signal indicating the selection is supplied from the unit drive circuits. In order to generate the electric field, unlike the magnetic field generation, the direct current does not need to flow in the drive electrodes, and therefore the switch control circuits SWL, SWR make the fourth switches and the sixth switches into the open state.

[0259] Figures 15-18 is a schematic plan view indicating the action in a case where the electric field touch detection is instructed. In this figure, a state when the unit drive circuits USL(n+2), USR(n+2) output the selection signal indicating the selection is indicated.

[0260] In the switch control circuit SWL, if the selection signal indicating the selection is supplied from the unit drive circuit USL(n+2), the third switch STLn+2 connected between the end portion on one side of the drive electrode TL(n+2) corresponding to this unit drive circuit USL(n+2) and the signal wiring TSV is made into the on state by the first drive signal. In addition, the switch control circuit SWL at this time controls by the first drive signal in a manner that the other third switches STLn to STLn+1 and STLn+3 to STLn+5 other than the third switch STLn+2 are made into the open state.

[0261] In the switch control circuit SWR, if the selection signal indicating the selection is supplied from the unit drive circuit USR(n+2), the fifth switch STRn+2 connected between the end portion on the other side of the drive electrode TL(n+2) corresponding to this unit drive circuit USR(n+2) and the signal wiring TSV is made into the on state by the third drive signal. In addition, the switch control circuit SWR at this time controls by the third drive signal in a manner that the other fifth switches STRn to STRn+1 and STRn+3 to STRn+5 other than the fifth switch STRn+2 are made into the open state.

[0262] The switch control circuits SWL, SWR make the fourth switch and the sixth switch, except for the fourth switch SVLn+2 and the sixth switch SVRn+2 connected to the drive electrode TL(n+2) generating the electric field, into the on state by the second drive signal and the fourth drive signal.

[0263] When the electric field touch is detected, the drive signal TSVCOM, in which the voltage is periodically changed, is also supplied to the signal wiring TSV. Therefore, the drive signal TSVCOM is supplied to one end portion of the drive electrode TL(n+2) via the third switch STLn+2, and the drive signal TSVCOM is supplied to the other end portion of the drive electrode TL(n+2) via the fifth switch STRn+2. As a result, the drive signal TSVCOM is supplied to the drive electrode TL(n+2) from both end portions thereof, and the electric field according to the drive signal TSVCOM is generated in the drive electrode TL(n+2).

[0264] The selection information SEI indicating the selection is moved from the unit drive circuits USL(n+2), USR(n+2) to the unit drive circuits USL(n+3), USR(n+3) by changing the clock signal CLK. Thereby, the switch control circuit SWL makes the third switch STLn+3 into the on state, and the switch control circuit SWR makes the fifth switch STRn+3 into the on state. At this time, the third switches except for the third switch STLn+3 and the fifth switches except for the fifth switch STRn+3 are made into the off state. Thereby, in the drive electrode TL(n+3) disposed next to the drive electrode TL(n+2), the electric field corresponding to the drive signal TSVCOM is generated.

[0265] As described above, by changing the clock signal CLK, the electric field is sequentially generated from the drive electrode disposed on the side 2-U toward the drive electrode disposed on the side 2-D.

[0266] In the above-described Figure 13 , an example in which one third switch, one fourth switch, one fifth switch, and one sixth switch are connected to one drive electrode, respectively, is shown, but the present application is not limited thereto. For example, as shown in Figure 16 , one third switch, one fourth switch, one fifth switch, and one sixth switch can be connected to six (or more) drive electrodes disposed adjacent to each other, respectively.

[0267] Further, the third switch, the fourth switch, the fifth switch, and the sixth switch connected to the drive electrodes adjacent to each other can be substantially simultaneously switched by the selection information from the same unit drive circuit. For example, in Figure 36In this circuit, based on the selection signal from the unit drive circuit USL(n+2), the third switch STLn connected to the drive electrode TL(n) and the third switch STLn+1 connected to the drive electrode TL(n+1) can be essentially turned on simultaneously. Similarly, based on the selection signal from the unit drive circuit USR(n+2), the sixth switch SVRn connected to the drive electrode TL(n) and the sixth switch SVRn+1 connected to the drive electrode TL(n+1) can be essentially turned on simultaneously. This allows the drive electrodes TL(n) and TL(n+1) to be bundled together, generating a magnetic field and strengthening the resulting magnetic field.

[0268] When driving electrodes TL(n) and TL(n+1) are bundled together, driving electrodes TL(n+3) and TL(n+4) are also bundled together, thereby further strengthening the magnetic field generated in the region of driving electrode TL(n+2). In this case, the configuration of bundling driving electrodes TL(n+3) and TL(n+4) is the same as the configuration of bundling driving electrodes TL(n) and TL(n+1).

[0269] For example, it can target in Figure 37 and Figure 19 The configuration shown in the diagram, in the configuration of Embodiment 1, reduces the number of switches. Therefore, control becomes easier, and the increase in occupied area can be suppressed.

[0270] <Composition of the switching adjustment circuit>

[0271] Figure 19 This is a top view showing the configuration of the display device 1 according to Embodiment 1. Figures 14 to 17 In the middle, it indicates the state during magnetic field touch detection. For example, in... Figure 1 The text explains that in magnetic field touch detection, a magnetic field is generated using a driving electrode during the TGT (Touch Geometric Detection) phase. For example, in... Figure 2 and Figure 1 The explanation states that, depending on whether the pen is close, the amount of charge charged in the capacitor element C inside the pen changes due to the magnetic field generated during the magnetic field generation period (TGT). During the magnetic field detection period (TDT), the magnetic field generated by the coil L1 inside the pen is detected by the amount of charge accumulated in the capacitor element C inside the pen.

[0272] exist Figure 2 and Figures 14 to 17 In this example, the case where the magnetic field generating coil and the magnetic field detection coil are constructed using the same coil is described. In contrast, in embodiment one, as in... Figure 19 The explanation states that during the magnetic field generation period, the TGT generates a magnetic field without using a coil (magnetic field generating coil), and detects the magnetic field from the pen through a magnetic field detection coil.

[0273] In Embodiment One, signal lines are used, and during the magnetic field detection period TDT, magnetic field detection coils are formed.

[0274] In Figure 19 , during the magnetic field generation period TGT, drive electrodes for generating a magnetic field are omitted, and during the magnetic field detection period TDT, only signal lines constituting magnetic field detection coils are depicted. During the magnetic field detection period TDT, the signal lines are used to detect a magnetic field, and thus can be considered as detection electrodes. In this case, during the magnetic field generation period TGT, the signal lines are not used to detect a magnetic field, and thus can be considered as non-detection electrodes. Figure 19 In , only detection electrodes are described.

[0275] Figure 19 In Figure 10 , SL(0) to SL(p) indicate signal lines. The signal lines SL(0) to SL(p) cross the drive electrodes TL(0) to TL(p) as indicated in Figure 19 . That is, between the edge 2-R and the edge 2-L of the display panel 2, the signal lines SL(0) to SL(p) are arranged in parallel with each other.

[0276] Although not particularly limited, in this Embodiment One, along the edge 2-L of the display panel 2, a magnetic field signal line SL(dL) is arranged, and along the edge 2-R of the display panel 2, a magnetic field signal line SL(dR) is arranged. That is, a magnetic field signal line SL(dR) (second signal line) is arranged outside the active area of the display panel 2 and along the edge 2-R in a manner parallel to the signal lines SL(0) to SL(p) (first signal lines), and a magnetic field signal line SL(dL) (second signal line) is arranged outside the active area of the display panel 2 and along the edge 2-R in a manner parallel to the signal lines SL(0) to SL(p). This magnetic field signal line SL(dR), SL(dL) is outside the active area of the display panel 2, and thus does not contribute to display, but is used for magnetic field touch detection.

[0277] In Embodiment One, a switching adjustment circuit SCX is arranged along the edge 2-U of the display panel 2. In Figure 19 , the upper side indicates the edge 2-U side of the display panel 2, and the lower side indicates the edge 2-D side of the display panel 2. The switching adjustment circuit SCX includes seventh switches j00, j01 and eighth switches k00 to kp.

[0278] Although not particularly limited, the signal lines SL(0) to SL(p) are arranged in the order from the edge 2-L toward the edge 2-R of the display panel 2. In this embodiment one, during the magnetic field detection period TDT, the signal lines arranged with two signal lines in the middle are connected by the eighth switches k00 to kp. If, for example, Figure 19 the eighth switch k00 is connected between the end of the signal line SL(1) and the end of the signal line SL(4), and the eighth switch k01 is connected between the end of the signal line SL(3) and the end of the signal line SL(6). In addition, the eighth switch kn-1 is connected between the end of the signal line SL(n-2) and the end of the signal line SL(n+1), the eighth switch kn is connected between the end of the signal line SL(n) and the end of the signal line SL(n+3), and the eighth switch kn+1 is connected between the end of the signal line SL(n+2) and the end of the signal line SL(n+5).

[0279] Furthermore, the eighth switch kp-1 is connected between the end of the signal line SL(p-6) and the end of the signal line SL(p-3), and the eighth switch kp is connected between the end of the signal line SL(p-4) and the end of the signal line SL(p-1).

[0280] The seventh switch j00 is connected between the end of the magnetic field signal line SL(dL) and the end of the signal line SL(2), and the seventh switch j01 is connected between the end of the magnetic field signal line SL(dR) and the end of the signal line SL(p-2).

[0281] The seventh switches j00, j01 and the eighth switches k00 to kp are each switched by the magnetic field enable signal SC_EN. In this embodiment one, the seventh switches j00, j01 and the eighth switches k00 to kp are in the on state when the magnetic field enable signal SC_EN designates the magnetic field touch detection, and are in the off state otherwise.

[0282] As a result, when the magnetic field touch detection, the signal lines arranged with two signal lines in the middle are electrically connected. If, for example, Figure 19For example, the signal line SL(l) and the signal line SL(4) are connected by the eighth switch kOO across the signal lines SL(2) and SL(3). Similarly, the signal line SL(3) and the signal line SL(6) are connected by the eighth switch kOl across the signal lines SL(4), SL(5), the signal line SL(n-2) and the signal line SL(n+1) are connected by the eighth switch kn-1 across the signal lines SL(n-1), SL(n), the signal line SL(n) and the signal line SL(n+3) are connected by the eighth switch kn across the signal lines SL(n+1), SL(n+2), and the signal line SL(n+2) and the signal line SL(n+5) are connected by the eighth switch kn+1 across the signal lines SL(n+3), SL(n+4).

[0283] Further, the signal line SL(p-6) and the signal line SL(p-3) are connected by the eighth switch kp-1 across the signal lines SL(p-5), SL(p-4), and the signal line SL(p-4) and the signal line SL(p-2) are connected by the eighth switch kp across the signal lines SL(p-3), SL(p-2).

[0284] In this embodiment, further, the signal line SL(dL) and the signal line SL(2) are connected by the seventh switch jOO across the signal lines SL(0), SL(l), and the signal line SL(dR) and the signal line SL(p-2) are connected by the seventh switch jOl across the signal lines SL(p-1), SL(p).

[0285] Thus, during the magnetic field detection period TDT, a magnetic field detection coil is formed by any of a plurality of the signal lines SL(0) to SL(p). In this embodiment, near the edges 2-R and 2-L of the display panel 2, a magnetic field detection coil can also be formed during the magnetic field detection period TDT. That is, the signal lines SL(0), SL(l) disposed near the edge 2-L of the display panel 2 can be formed as a magnetic field detection coil with the signal line SL(dL) and the signal line SL(2) as windings. Similarly, the signal lines SL(p-1), SL(p) disposed near the edge 2-R of the display panel 2 can be formed as a magnetic field detection coil with the signal line SL(dR) and the signal line SL(p-2) as windings. Thus, even in the case where the pen approaches near the edges 2-R and 2-L, detection is possible. Further, in this embodiment, as shown from the above, the magnetic field detection coil formed by the signal lines SL(0) to SL(l) and the signal lines SL(p-1) to SL(p) is formed so as to overlap the magnetic field detection coil formed by the signal lines SL(2) to SL(5) and the signal lines SL(p-2) to SL(p+1). Figure 8 It is understood that the magnetic field detection coils formed overlap each other. Thus, detection leakage can be prevented.

[0286] The widths d8, d10 of the signal lines SL (dR), SL (dL) for the magnetic field are narrower than the widths d9, d10 of the signal lines SL (0) - SL (p). Thus, the frame can be prevented from becoming large.

[0287] During the magnetic field detection period TDT, the one end of the pair of terminals of each magnetic field detection coil formed by the signal lines is supplied with the ground voltage Vss, and the other end is connected to the amplification circuit AMP as explained in Figure 19 . If an example is explained using Figure 14 , the ends of the signal lines SL (n-2), SL (n), SL (n+2) are connected to the amplification circuit AMP. If the magnetic field from the pen reaches the magnetic field detection coil formed by the signal lines, an induced voltage is generated in the magnetic field detection coil, and the input signal of the amplification circuit AMP changes. The amplification circuit AMP amplifies the change of the input signal and outputs it as the sensor signals S (0) - S (p).

[0288] On the other hand, in the electric field touch detection, the seventh switches j00, j01 and the eighth switches k00 - kp are in the off state. When the electric field touch detection, as explained in Figure 18 and Figure 20 , the driving electrodes generate the electric field. Depending on whether the finger touches or not, the electric field in the signal lines changes, and the change is transmitted to the amplification circuit AMP, amplified, and output as the sensor signals S (0) - S (p).

[0289] In Embodiment 1, an example in which the signal lines SL (dR), SL (dL) for the magnetic field, which are formed when the magnetic field detection coil is formed, are provided along both sides of the display panel 2, but of course, they can be provided on one side.

[0290] Figure 20 is a perspective view schematically showing the configuration of the display device 1 according to Embodiment 1. In the drawing, the driving electrodes TL (0) - TL (p), the signal lines SL (0) - SL (p), the eighth switches k00 - kp, the driving semiconductor device DDIC, the selection driving circuits SSR, SSL, and the gate driver 5 are shown. They are formed in the TFT glass substrate TGB. Thus, it can also be considered that in Figure 20 , the display device 1 mounted in the module is shown. In addition, in Figure 19 , the pen including the coil L1 is also shown.

[0291] Along edge 900-R of the module, a selection drive circuit SSR is arranged, and along edge 900-L, a selection drive circuit SSL and a gate driver 5 are arranged. Signal lines SL(0) to SL(p) are arranged parallel to each other between the selection drive circuit SSL and the selection drive circuit SSR. An eighth switch k00 to kp is arranged along edge 900-U of the module. The drive electrodes TL(0) to TL(p) are configured to be orthogonal to and parallel to the signal lines SL(0) to SL(p).

[0292] The eighth switch k00~kp is as follows Figure 20 The instructions state that during touch detection, the signal lines are connected. Figure 19 Along the edge 900-D of the module, a ninth switch 100-1p formed in the TFT glass substrate TGB is disposed.

[0293] The ninth switches l00-lp are divided into two groups. The ninth switches in the first group are connected to the signal line that should be supplied with ground voltage Vss during the magnetic field detection (TDT) period, for example... Figure 19 The signal lines SL(2), SL(n+3), SL(p-1), etc., shown, are connected to the voltage wiring VL3 at their respective ends, and are in the ON state during TDT (Time-to-Delay) magnetic field detection. Additionally, the twelfth switch of the second group is connected to the signal line that changes the signal in the output coil during TDT, for example... Figure 20 The ends of the signal lines SL(1), SL(n), SL(p-4), etc., shown are connected to the corresponding signal wiring LL7. Figure 8 In the figure, as an example, the ninth switches (second group) connected to the end of signal line SL(0), the ninth switches (second group) connected to the end of signal line SL(n), the ninth switches (first group) connected to the end of signal line SL(n+3), and the ninth switches (first group) connected to the end of signal line L(p) are labeled with reference numerals l00, ln, ln+3, and lp. The signal wiring LL7 is represented as a wiring, but includes the number of signal wirings corresponding to the ninth switches of the second group. During magnetic field detection, the ninth switches of the second group are also turned on. Thus, the signals generated in each coil are transmitted to the corresponding signal wiring LL7, amplified by the amplifier circuit AMP, and supplied as sensing signals S(0) to S(p) to the touch detection semiconductor device 6 ( Figure 8 ).

[0294] When the electric field touch detection is performed, the ninth switch of the second group also becomes closed, supplying the signal change in the signal line to the amplifier circuit AMP for amplification, which serves as the sensing signal S(0)~S(p) and is supplied to the touch detection semiconductor device 6( Figure 20 ).

[0295] In this first embodiment, the ninth switches 100 to 1p are formed in the TFT glass substrate, and a driving semiconductor device DDIC is disposed thereon, covering the ninth switches 100 to 1p. This suppresses bezel expansion.

[0296] Although not specifically restricted, the signal wiring TSV and the voltage wiring VCOM extend along the module's edges 900-R and 900-L. During the magnetic field generation TGT, the signal wiring TSV is supplied with the drive signal TSVCOM, and the voltage wiring VCOM is supplied with the ground voltage Vss. Additionally, during electric field touch detection, the signal wiring TSV is supplied with the drive signal TSVCOM.

[0297] During the magnetic field generation period TGT of the magnetic field touch detection, by selecting the drive circuits SSL and SSR, a current I1 flows in the direction indicated by the arrow in the drive electrodes TL(n-1) and TL(n). Simultaneously, by selecting the drive circuits SSL and SSR, a current I2 flows in the direction indicated by the arrow in the drive electrodes TL(n+3) and TL(n+4). Thus, by periodically changing the drive signal TSVCOM, periodically changing magnetic fields are generated in the drive electrodes TL(n-1), TL(n), TL(n+3), and TL(n+4). Figure 20 In the diagram, the generated magnetic field is schematically represented by dashed lines. In the region between the driving electrodes TL(n-1) and TL(n+1) sandwiched by the driving electrodes TL(n-1), TL(n), TL(n+3), and TL(n+4), a superimposed magnetic field and a strong magnetic field are generated.

[0298] If a pen is present near the region generating a strong magnetic field, the coils L1 inside the pen will induce a voltage through mutual induction. This induced voltage will charge the capacitor C (not shown) inside the pen's PN.

[0299] The charge in the capacitor element C generates a magnetic field in the internal coil L1 during magnetic field detection (TDT). Figure 19 In the diagram, the magnetic field lines at this point are represented as...

[0300] During TDT (Time-to-Device Transmission) in magnetic field detection, such as in Figure 20In the eighth switch k00 to kp becomes an on state. By this, a plurality of coils that make the signal lines SL(0) to SL(p) into a winding are formed. By the effect of the mutual induction of the coils that make the signal lines into a winding and the in-pen coil LI, an induced voltage is generated in the coils that make the signal lines into a winding, and the signal in the signal lines is transmitted to the ninth switch of the second group. By making the ninth switch of the second group into an on state, the output from the amplification circuit AMP is output as a sensing signal S(0) to S(p). In Figure 21 In the eighth switch k00 to kp becomes an on state. By this, a plurality of coils that make the signal lines SL(0) to SL(p) into a winding are formed. By the effect of the mutual induction of the coils that make the signal lines into a winding and the in-pen coil LI, an induced voltage is generated in the coils that make the signal lines into a winding, and the signal in the signal lines is transmitted to the ninth switch of the second group. By making the ninth switch of the second group into an on state, the output from the amplification circuit AMP is output as a sensing signal S(0) to S(p). In

[0301] The case where the magnetic field signal lines SL(dL), SL(dR) are arranged outside the active area of the display panel 2 is described, but is not limited thereto. For example, the magnetic field signal lines SL(dL) and / or SL(dR) can be arranged in the active area of the display panel 2 along the edges 2-L and 2-R, respectively. In this case, by making the width d10 of the arranged magnetic field signal lines SL(dL) and / or SL(dR) narrower than the width d11 of the signal lines, the narrowing of the display area can be reduced.

[0302] <Modified Example>

[0303] Figure 21 is a perspective view schematically showing a display device 1 according to a modified example of Embodiment 1. Figure 20 is similar to Figure 20 , and thus mainly the points of difference from Figure 20 will be described. In the display device 1 shown in Figure 20 , when magnetic field touch detection is performed, the signal lines SL(0) to SL(p) form magnetic field detection coils. In addition, when electric field touch detection is performed, the signal lines SL(0) to SL(p) are also used to detect changes in the electric field. In contrast, in the modified example, the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB are used to form magnetic field detection coils when magnetic field touch detection is performed. In addition, even when electric field touch detection is performed, the detection electrodes RL(0) to RL(p) are used to detect changes in the electric field. That is, instead of the signal lines SL(0) to SL(p) shown in Figure 4 , the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB are used when magnetic field touch detection and electric field touch detection are performed.

[0304] The detection electrodes RL(0) to RL(p) are as shown in Figure 21The detection electrodes RL(0) - RL(p) are formed on the main surface CSF1 of the CF glass substrate CGB. Thus, the detection electrodes RL(0) - RL(p) are formed on the drive electrodes TL(0) - TL(p) with the liquid crystal layer, the color filter, and the CF glass substrate CGB interposed therebetween. When viewed from the side of the main surface CSF1 of the CF glass substrate CGB, the drive detection electrodes RL(0) - RL(p) are arranged in parallel to each other and orthogonal to the electrodes TL(0) - TL(p).

[0305] In Figure 20 , the one end portions of the detection electrodes RL(0) - RL(p) are connected to each other at predetermined intervals. In this modification, the one end portions of the detection electrodes RL(0) - RL(p) are connected to each other at intervals in which two detection electrodes are interposed therebetween, as in the signal lines SL(0) - SL(p) shown in Figure 21 . The connection between the detection electrodes is achieved by signal wiring formed in the CF glass substrate CGB. In Figure 21 , for the sake of easy understanding of the drawings, only the detection electrodes RL(0) - RL(p) among the detection electrodes RL(0) - RL(6), RL(n), RL(n+3), and RL(p-3) - RL(p) are labeled with reference numerals. If an example is described with Figure 21 as an example, the one end portions of the detection electrodes RL(1) and RL(4) are connected to each other on the side of the edge 900-U of the module. In addition, the one end portions of the detection electrodes RL(3) and RL(6) are connected to each other. Note that the one end portion of the detection electrode RL(2) is connected to the one end portion of the detection electrode RL(0) closest to the edge 900-L of the module with one detection electrode TL(1) interposed therebetween. As for the one end portions of the other detection electrodes, the one end portions of the detection electrodes are connected to each other with two detection electrodes interposed therebetween, except for the detection electrode RL(p-3).

[0306] The other end portions of the detection electrodes RL(0) - RL(p) are connected to the ninth switches lOO - lp formed in the TFT glass substrate TGB. In Figure 20 , in order to show the connection of the detection electrodes RL(0) - RL(p) and the ninth switches lOO - lp, the ninth switches lOO - lp are depicted on the CF glass substrate CGB, but as in Figure 20 , the ninth switches lOO - lp are formed in the TFT glass substrate TGB. Further, the ninth switches lOO - lp are covered by the drive semiconductor device DDIC, as in the example shown in Figure 21 . In Figure 21 , the drive semiconductor device DDIC is shown by a broken line in the TFT glass substrate TGB.

[0307] Figure 20 The ninth switches lOO-lp shown are configured by the first group and the second group. During the magnetic field detection period TDT, the ninth switches of the first group become the on state, so that the ends of the magnetic field detection coil formed by the detection electrodes RL(0)-RL(p) are supplied with the ground voltage Vss, and the ninth switches of the second group become the on state, so that the ends of the magnetic field detection coil are connected to the amplification circuit AMP. Figure 20

[0308] In this modification, also during the magnetic field generation period TGT, the ninth switches lOO-lp shown are configured by the first group and the second group. During the magnetic field detection period TDT, the ninth switches of the first group become the on state, so that the ends of the magnetic field detection coil formed by the detection electrodes RL(0)-RL(p) are supplied with the ground voltage Vss, and the ninth switches of the second group become the on state, so that the ends of the magnetic field detection coil are connected to the amplification circuit AMP. Figure 20 Similarly, a magnetic field is generated by the drive electrodes TL(0)-TL(p). If a magnetic field is generated by the pen according to the generated magnetic field during the magnetic field detection period TDT, the magnetic field is detected by the magnetic field detection coil formed by the detection electrodes RL(0)-RL(p), and is output from the amplification circuit AMP as the sensor signals S(0)-S(p). Therefore, when the drive electrodes from which the magnetic field is generated are driven, the detection electrodes from which the magnetic field is detected are determined, so that the coordinates touched by the pen can be determined.

[0309] When the electric field touch detection is performed, the ninth switches lOO-lp shown are configured by the first group and the second group. During the electric field detection period TET, the ninth switches of the first group become the on state, so that the ends of the electric field detection coil formed by the detection electrodes RL(0)-RL(p) are supplied with the ground voltage Vss, and the ninth switches of the second group become the on state, so that the ends of the electric field detection coil are connected to the amplification circuit AMP. Figure 19 Similarly, an electric field is generated by the drive electrodes TL(0)-TL(p), and the change in the electric field generated by whether or not a finger touches is transmitted to the amplification circuit AMP by the detection electrodes RL(0)-RL(p) as the sensor signals S(0)-S(p).

[0310] The signal lines SL(0)-SL(p) are used to transmit image information during the display period, so that it is required that they are electrically separated from each other during the display period. Therefore, in the display device 1 shown in Figure 20 and Figure 21 In the display device 1 shown, the seventh and eighth switches are provided. In contrast, in the modification shown, the magnetic field touch detection and the electric field touch detection are performed using the detection electrodes RL(0)-RL(p) instead of the signal lines SL(0)-SL(p). Therefore, in order to perform the magnetic field touch detection, the seventh and eighth switches can not be provided, and the increase in the occupied area can be suppressed. Figure 22 In the first embodiment, the magnetic field generation coil is not required to be formed, so that the control becomes easy, and the increase in the occupied area of the control circuit can be suppressed.

[0311] (Second Embodiment)

[0312]

[0313] Figure 22 is a plan view showing the configuration of the display device 1 according to the second embodiment. In the display device 1 shown, the magnetic field generation coil is not formed, and the magnetic field generation period TGT is not provided. In the display device 1 shown, the magnetic field detection period TDT is provided. Figure 22 ​​In FIG. 6, only the portion related to the display panel 2 explained in Embodiment 1 is shown, and the other portions are omitted.

[0314] In Figure 22 In FIG. 6, TL(0) to TL(p) represent the driving electrodes arranged in parallel with each other between the edge 2-U and the edge 2-D of the display panel 2. In addition, TL(dLU) represents a dummy driving electrode for magnetic field generation arranged along the edge 2-U in the region outside the display panel 2 (inactive region), and TL(dLD) represents a dummy driving electrode for magnetic field generation arranged along the edge 2-D in the region outside the display panel 2 (inactive region). The dummy driving electrode for magnetic field generation is arranged in the outside region of the display panel 2, and is therefore also referred to as an outside region driving electrode hereinafter.

[0315] In addition, in Figure 14 In FIG. 6, USL(0) to USL(p) and USR(0) to USR(p) represent the unit driving circuits, respectively. As explained in Figure 16 、 Figure 17 and Figure 23 , the unit driving circuits USL(0) to USL(p) are arranged along the edge 2-L of the display panel 2, respectively, corresponding to the driving electrodes TL(0) to TL(p). In addition, the unit driving circuits USR(0) to USR(p) are arranged along the edge 2-R of the display panel 2, respectively, corresponding to the driving electrodes TL(0) to TL(p).

[0316] As explained in Embodiment 1, in the magnetic field generation period TGT, the driving signal TSVCOM is supplied to two driving electrodes arranged in such a manner as to sandwich the driving electrode corresponding to the unit driving circuit outputting the selection signal selected as the output. For example, if the unit driving circuits USL(2) and USR(2) output the selection signal selected as the output in the magnetic field generation period TGT, the driving signal TSVCOM is supplied to the driving electrodes TL(1) and TL(3) arranged in such a manner as to sandwich the driving electrode TL(2) corresponding to these unit driving circuits USL(2) and USR(2). That is, the driving signal TSVCOM is supplied from the edge 2-L side for one end portion of the driving electrode TL(1), and the ground voltage Vss is supplied from the edge 2-R side for the other end portion of the driving electrode TL(1). At this time, the driving signal TSVCOM is supplied from the edge 2-R side for the other end portion of the driving electrode TL(3), and the ground voltage Vss is supplied from the edge 2-L side for one end portion of the driving electrode TL(3). As a result, in the selected driving electrode TL(2), the magnetic field generated in the driving electrode TL(1) and the magnetic field generated in the driving electrode TL(3) are superimposed, and a strong magnetic field is generated.

[0317] In this case, when the drive electrode TL(0) disposed near the edge 2-U of the display panel 2 is selected, the drive electrodes near the drive electrode TL(0) become only the drive electrode TL(l). Therefore, the magnetic field generated in the drive electrode TL(0) becomes weak when the drive electrode TL(0) is selected. Similarly, when the drive electrode TL(p) disposed near the edge 2-D of the display panel 2 is selected, the drive electrodes near the drive electrode TL(p) become only the drive electrode TL(p-l). Therefore, the magnetic field generated in the drive electrode TL(p) becomes weak when the drive electrode TL(p) is selected.

[0318] In this embodiment two, the external area drive electrode TL(dLU) is disposed on the opposite side of the drive electrode TL(0) across the edge 2-U, and the external area drive electrode TL(dLD) is disposed on the opposite side of the drive electrode TL(p) across the edge 2-D.

[0319] When the magnetic field is generated in the drive electrode TL(0), the magnetic field is generated in the drive electrode TL(l) and the external area drive electrode TL(dLU) disposed across the drive electrode TL(0), respectively. Also, when the magnetic field is generated in the drive electrode TL(p), the magnetic field is generated in the drive electrode TL(p-l) and the external area drive electrode TL(dLD) disposed across the drive electrode TL(p), respectively. Thus, it is possible to prevent the detection accuracy of the pen from being reduced in the regions near the edges 2-U, 2-D of the display panel 2.

[0320] Note that the external area drive electrodes TL(dLU), TL(dLD) are used only for generating the magnetic field, and therefore the line widths dLU, dLD can be narrower than the line width dd of the drive electrodes TL(0) to TL(p).

[0321] Figure 8 is a plan view showing the case where the magnetic field is generated in the drive electrode TL(0). In the magnetic field generation period TGT, when the selection signal indicating the selection is output from the unit drive circuits USL(0), USR(0) corresponding to the drive electrode TL(0), the selection circuit SL-C is constituted in such a manner that the drive signal TSVCOM is supplied to the edge 2-L side of the end portion of one side of the external area drive electrode TL(dLU) and the ground voltage Vss is supplied to the edge 2-L side of the end portion of one side of the drive electrode TL(l) in response to the selection signal from the unit drive circuit USL(0). Figure 14 and Figure 8Additionally, in response to the selection signal from the unit drive circuit USR(0) at this time, a ground voltage Vss is supplied to the other end of the external region drive electrode TL(dLU) on the side 2-R, and a drive signal TSVCOM is supplied to the other end of the drive electrode TL(1) on the side 2-R, thereby constructing the selection circuit SR-C( Figure 14 and Figure 24 ).

[0322] Therefore, when the driving electrode TL(0) is selected and positioned closest to edge 2-U, a magnetic field is generated in the driving electrode TL(1) by the current I2 flowing through the arrow. Additionally, a magnetic field is generated in the outer region driving electrode TL(dLU) by the current I1 flowing through the arrow. The magnetic field generated by the driving electrode TL(1) and the magnetic field generated by the outer region driving electrode TL(dLU) overlap in the region of the driving electrode TL(0), thus generating a strong magnetic field in the region of the driving electrode TL(0).

[0323] Figure 8 This is a top view showing the generation of a magnetic field in the driving electrode TL(p). During the magnetic field generation period TGT, when the unit driving circuits USL(p) and USR(p) corresponding to the driving electrode TL(p) output selection signals indicating selection, in response to the selection signal from the unit driving circuit USL(p), the selection circuit SL-C is configured such that a ground voltage Vss is supplied to one end of the external region driving electrode TL(dLU) on the side 2-L, and a driving signal TSVCOM is supplied to one end of the driving electrode TL(p-1) on the side 2-L. Figure 14 as well as Figure 8 Additionally, in response to the selection signal from the unit drive circuit USR(p) at this time, a drive signal TSVCOM is supplied to the other end of the external region drive electrode TL(dLU) on the side 2-R, and a ground voltage Vss is supplied to the other end of the drive electrode TL(p-1) on the side 2-R, thereby constructing the selection circuit SR-C. Figure 14 as well as Figures 22 to 24 ).

[0324] Therefore, when the driving electrode TL(0) is selected and positioned closest to edge 2-D, a magnetic field is generated in the driving electrode TL(p-1) by the current I1 flowing through the arrow. Additionally, a magnetic field is generated in the outer region driving electrode TL(dLD) by the current I2 flowing through the arrow. In the region of the driving electrode TL(p), the magnetic field generated by the driving electrode TL(p-1) and the magnetic field generated by the outer region driving electrode TL(dLD) overlap, resulting in a strong magnetic field in the region of the driving electrode TL(p).

[0325] In the magnetic field generation period TGT, two drive electrodes arranged in a manner so as to sandwich the unit drive circuit corresponding to the selection signal of the output display are supplied with the drive signal TSVCOM and the ground voltage Vss, but the example is not limited thereto. For example, two drive electrodes arranged in a manner so as to sandwich the unit selection circuit corresponding to the region where the strong magnetic field is generated can be selected by the corresponding unit selection circuit. In this case, as shown in FIG. 8, the unit drive circuit USL(dU) and the unit drive circuit USR(dU) are arranged in both end portions of the outer region drive electrode TL(dLU), and the unit drive circuit USL(dD) and the unit drive circuit USR(dD) are arranged in both end portions of the outer region drive electrode TL(dLD). Figure 8

[0326] In this case, in the magnetic field generation period TGT, two of the unit drive circuits USL(0) to USL(p), USL(dL), and USL(dD) arranged in a manner so as to sandwich the unit drive circuit corresponding to the drive electrode where the strong magnetic field is generated output the selection signal of the output display. Similarly, two of the unit drive circuits USR(0) to USR(p), USR(dL), and USR(dD) arranged in a manner so as to sandwich the unit drive circuit corresponding to the drive electrode where the strong magnetic field is generated output the selection signal of the output display.

[0327] For example, in the case where the strong magnetic field is generated in the region of the drive electrode TL(2), the unit drive circuit USL(1) and the unit drive circuit USL(3) arranged in a manner so as to sandwich the unit selection circuit USL(2) output the selection signal of the output display. The selection circuit SL-C( Figure 14 , Figure 8 ) supplies the drive signal TSVCOM to one end portion of the drive electrode TL(1) corresponding to the unit selection circuit USL(1) and the ground voltage Vss to one end portion of the drive electrode TL(3) corresponding to the unit selection circuit USL(3) in accordance with the selection signals from the unit selection circuits USL(1) and USL(3).

[0328] At this time, the unit drive circuit USR(1) and the unit drive circuit USR(3) arranged in a manner so as to sandwich the unit selection circuit USR(2) corresponding to the drive electrode TL(2) output the selection signal of the output display. The selection circuit SR-C( Figure 14 , Figure 23 ​) According to the selection signals from the unit selection circuits USR(1), USR(3), a ground voltage Vss is supplied to the end portion of the other side of the drive electrode TL(1) corresponding to the unit selection circuit USR(1), and a drive signal TSVCOM is supplied to the end portion of the other side of the drive electrode TL(3) corresponding to the unit selection circuit USR(3). Thus, in the region of the drive electrode TL(2), the magnetic field generated by the drive electrode TL(1) and the magnetic field generated by the drive electrode TL(3) are superimposed.

[0329] In the case where a strong magnetic field is generated in the drive electrode TL(0), Figure 23 The unit drive circuits USL(dU), USR(dU), USL(1), and USR(1) shown output selection signals indicating selection. In response thereto, the selection circuit SL-C supplies a drive signal TSVCOM to the end portion of one side of the external region drive electrode TL(dLU) and a ground voltage Vss to the end portion of one side of the drive electrode TL(1). In addition, the selection circuit SR-C supplies a ground voltage Vss to the end portion of the other side of the external region drive electrode TL(dLU) and a drive signal TSVCOM to the end portion of the other side of the drive electrode TL(1). Thus, in the region of the drive electrode TL(0), Figure 24 In the region of the drive electrode TL(0), the currents I1, I2 indicated by arrows flow, thereby generating a magnetic field, and a strong magnetic field can be generated.

[0330] In addition, in the case where a strong magnetic field is generated in the drive electrode TL(p), Figure 24 The unit drive circuits USL(dD), USR(dD), USL(p-1), and USR(p-1) shown output selection signals indicating selection. In response thereto, the selection circuit SL-C supplies a ground voltage Vss to the end portion of one side of the external region drive electrode TL(dLD) and a drive signal TSVCOM to the end portion of one side of the drive electrode TL(p-1). In addition, the selection circuit SR-C supplies a drive signal TSVCOM to the end portion of the other side of the external region drive electrode TL(dLU) and a ground voltage Vss to the end portion of the other side of the drive electrode TL(p-1). Thus, in the region of the drive electrode TL(p), Figure 8 In the region of the drive electrode TL(p), the currents I1, I2 indicated by arrows flow, thereby generating a magnetic field, and a strong magnetic field can be generated.

[0331] Of course, the external region drive electrode can be provided only on one side of the display panel 2.

[0332] In Embodiment Two, it is possible to reduce the region in which the detection accuracy is reduced in the region in which display is performed (the region of the display panel 2).

[0333] (Embodiment Three)

[0334] In the display device 1, display is performed in the display panel 2, and detection of whether or not an external approaching object such as a pen or a finger touches an area within the display panel 2 or the like is performed. In this Embodiment Three, in the display panel 2, detection of whether or not an external approaching object touches an area within the display panel 2 or the like is performed by executing a plurality of stages of detection steps during one frame period in which display is performed. Here, an example in which detection of a touch by an external approaching object is performed by executing two stages of detection steps during one frame period will be described.

[0335] The two stages of detection steps include a first stage of detection step, and a second stage of detection step executed after the first stage of detection step. In the first stage of detection step, detection of whether or not an object such as a pen, which is an external approaching object, can be detected by magnetic field touch detection, touches an area of the display panel 2 is roughly performed. In the first stage of detection step, in a case where it is detected that a pen, which is an external approaching object, touches an area of the display panel 2, magnetic field touch detection of a coordinate, a distance, or the like touched is finely performed. On the other hand, in a case where it is not detected that a pen touches in the first stage of detection step, electric field touch detection is performed. This finely performed magnetic field touch detection or electric field touch detection becomes the second stage of detection step. Thus, in one frame period in which display is performed, it is possible to detect a touch regardless of which of a pen and a finger touches an area within the display panel 2.

[0336] Although not particularly limited, the two stages of detection steps are realized by the touch detection semiconductor device 6 (T-CNT) and the drive semiconductor device DDIC (D-CNT). Figure 8 ) and the drive semiconductor device DDIC ( Figure 13 ). That is, the control circuit T-CNT within the touch detection semiconductor device 6 divides one frame period into a first period and a second period following the first period, and in the first period, indicates magnetic field touch detection by a magnetic field enable signal SC_EN. In addition, in the first period, selection drive circuits SSL and SSR are controlled by a control signal Y-CNT in a manner that magnetic field touch detection is roughly performed. From the touch detection semiconductor device 6, whether or not a touch by a pen is detected is notified to the control circuit D-CNT within the drive semiconductor device DDIC by a control signal SW in the first period. In the first period, selection drive circuits SSL and SSR are controlled by a control signal Y-CNT in a manner that magnetic field touch detection is roughly performed.

[0337] In the magnetic field touch detection in the first-stage detection step, in a case where the touch of the pen is detected, the control circuit D-CNT in the drive semiconductor device DDIC also indicates the magnetic field touch detection by the magnetic field enable signal SC_EN in the second period. In this case, in the second period, the selection of the drive circuits SSL and SSR is controlled by the control signal Y-CNT so that the magnetic field touch detection is performed in detail. Thus, in the second period, the touch by the pen is detected.

[0338] On the other hand, in the magnetic field touch detection in the first-stage detection step, in a case where the touch of the pen is not detected, the control circuit D-CNT in the drive semiconductor device DDIC indicates the electric field touch detection by the electric field enable signal TC_EN in the second period. Thus, in the second period, the electric field touch detection is performed and the touch by the finger is detected.

[0339] The example in which the drive semiconductor device DDIC performs the two-stage detection step according to the control signal SW from the touch detection semiconductor device 6 has been described, but is not limited thereto. For example, the touch detection semiconductor device 6 can perform the control of the two-stage detection step and output the magnetic field enable signal SC_EN, the electric field enable signal TC_EN, and the like from the drive semiconductor device DDIC by the control signal SW.

[0340] The difference between the rough magnetic field touch detection and the detailed magnetic field touch detection is the difference in the number of drive electrodes that are separated by the drive electrodes to which the drive signal is supplied at the magnetic field generation period TGT. That is, the number of drive electrodes that are separated by the drive electrodes to which the drive signal is supplied at the magnetic field generation period TGT is larger in the case of the rough magnetic field touch detection than in the case of the detailed magnetic field touch detection. For example, in the case of the rough magnetic field touch detection, the drive signal TSVCOM is supplied to a pair of drive electrodes that are separated by 32 drive electrodes in the middle, as described in Embodiments 1 and 2. In contrast, in the case of the detailed magnetic field touch detection, the drive signal TSVCOM is supplied to a pair of drive electrodes that are separated by less than 32 drive electrodes and equal to or more than 1 drive electrode in the middle, as described in Embodiments 1 and 2.

[0341] If the number of driving electrodes supplied with the drive signal TSVCOM is the same in both coarse and fine magnetic field touch detection, then in coarse magnetic field touch detection, pen touches across the entire area of ​​the display panel 2 can be detected in a short time. On the other hand, in fine magnetic field touch detection, the distance between the pair of driving electrodes supplied with the drive signal becomes shorter, thus generating a strong magnetic field and improving detection accuracy. In both the first and second periods, when performing magnetic field touch detection, the first period can be considered the coarse magnetic field touch detection period, and the second period can be considered the fine magnetic field touch detection period.

[0342] Alternatively, in coarse touch detection, the number of driving electrodes supplied with driving signals can be increased to enhance the generated magnetic field. For example, this can be achieved by... Figure 25 As explained in (B), a pair of drive electrodes supplied with the drive signal TSVCOM are respectively made into a bundle composed of multiple drive electrodes.

[0343] In the first period, if no pen touch is detected, in the second period, electric field touch detection is performed in a manner that detects finger touch. Therefore, finger touch can also be detected.

[0344] In the first and second periods, touch detection is performed on the entire area of ​​the display panel 2, respectively. Therefore, it can also be considered that touch detection is performed twice on the entire area of ​​the display panel 2 within one frame. Under this observation, the first touch detection is magnetic field touch detection, and the second touch detection is either magnetic field touch detection or electric field touch detection.

[0345] Figure 25 This is a timing diagram illustrating the operation of the display device 1 according to Embodiment 3. Figure 25 In the diagram, the horizontal axis represents time t. Figure 25 (A) is a timing diagram representing the frame signal F. The driving semiconductor device DDIC displays on the display panel 2 according to the frame signal F. That is, the driving semiconductor device DDIC displays the entire area of ​​the display panel 2 during one period TF of the frame signal F. In other words, one frame is displayed during one frame period (TF).

[0346] Figure 25 (B) is a timing diagram representing the 1-period (1-frame period) TF of the periodic frame signal F. Figure 25 In (B), TF1 represents the first period that begins in response to the frame signal F, and TF2 represents the second period that follows the first period TF1. During display on display device 1, the process repeats... Figure 25The frame period TF is shown in (B), so the first periods TF1 and TF2 are also generated alternately according to this order.

[0347] Figure 25 (C) is a timing diagram schematically representing the display period and the touch detection period. Figure 25 In (C), the periods DPS1 to DPSp, filled with slashes, represent the display periods respectively. It should be noted that in... Figure 25 In (C), to avoid complicating the accompanying drawings, only DPS1, DPS2, DPSn to DPSn+2, and DPSp are labeled with reference numerals regarding the display period. During the display periods DPS1 to DPSp, image information is supplied to the signal lines from the driving semiconductor device DDIC, and the scan lines become high-level, thereby displaying the image information on the display panel 2. Display is performed separately during the display periods DPS1 to DPSp, thus displaying one frame of data.

[0348] exist Figure 25 In (C), CSS11 to CSS1p and CSS21 to CSS2p represent touch detection periods. Here, CSS11 to CSS1p represent the touch detection periods implemented in the first period TF1, and CSS21 to CSS2p represent the touch detection periods implemented in the second period TF2. During the touch detection periods CSS11 to CSS1p, coarse magnetic field touch detection is performed, and during the touch detection periods CSS11 to CSS1p, magnetic field touch detection is performed, thereby detecting pen touches across the entire area of ​​the display panel 2.

[0349] During touch detection, detailed magnetic field touch detection or electric field touch detection is performed in CSS21 to CSS2p respectively. Touch detection is performed in CSS21 to CSS2p respectively, thereby detecting touches made using a pen or finger across the entire area of ​​the display panel 2.

[0350] During touch detection periods CSS11 to CSS1p, coarse magnetic field touch detection is performed, thus enabling touch detection of the entire area of ​​display panel 2 with fewer iterations. Therefore, touch detection of the entire area is completed by time tp, before the completion of a single frame display. This ensures that touch detection of the entire display panel 2 is performed before the completion of a single frame display. Consequently, from time tp, touch detection of the entire area is performed again during touch detection periods CSS21 to CSS2p.

[0351] Figure 25 (D)~ Figure 8of (I) is a timing chart showing the drive signals TSVCOM supplied to the drive electrodes TL(n) ~ TL(n+5) arranged in the display panel 2.

[0352] The drive signals TL(n) ~ TL(n+5) are supplied from the selection drive circuits SSL and SSR shown in Figure 25 Figure 25 of (D) ~ Figure 22 In (I) of the same drawing, the left side shows the drive signals supplied to the drive electrodes TL(n) ~ TL(n+5) during the touch detection period CSS12, and the right side shows the drive signals supplied to the drive electrodes TL(n) ~ TL(n+5) during the touch detection period CSS24.

[0353] In the touch detection period CSS12, for example, the drive signal TSVCOM is supplied from the selection drive circuit SSL to one end portion of the drive electrode TL(n), and the ground voltage Vss is supplied to one end portion of the drive electrode TL(n+5). At this time, the ground voltage Vss is supplied from the selection drive circuit SSR to the other end portion of the drive electrode TL(n), and the drive signal TSVCOM is supplied to the other end portion of the drive electrode TL(n+5). Thus, magnetic fields are generated in the drive electrodes TL(n) and TL(n+5), respectively. The generated magnetic fields are overlapped in the regions of the drive electrodes TL(n+1) ~ TL(n+4) sandwiched by the drive electrodes TL(n) and TL(n+5).

[0354] On the other hand, in the touch detection period CSS24, for example, the drive signal TSVCOM is supplied from the selection drive circuit SSL to one end portion of the drive electrode TL(n), and the ground voltage Vss is supplied to one end portion of the drive electrode TL(n+2). At this time, the ground voltage Vss is supplied from the selection drive circuit SSR to the other end portion of the drive electrode TL(n), and the drive signal TSVCOM is supplied to the other end portion of the drive electrode TL(n+2). Thus, magnetic fields are generated in the drive electrodes TL(n) and TL(n+2), respectively. The generated magnetic fields are overlapped in the region of the drive electrode TL(n+1) separated by the drive electrodes TL(n) and TL(n+2). The distance between the drive electrodes supplied with the drive signal TSVCOM is shortened only by the drive electrode TL(n+1), and thus the magnetic field resulting from the overlapping of the magnetic fields is strengthened. As a result, the detection accuracy can be improved.

[0355] ​Alternatively, during touch detection (CSS12), the drive signal TSVCOM can be supplied from the select drive circuit SSL to the drive electrodes TL(n) and TL(n+1), and from the select drive circuit SSR to the drive electrodes TL(n+4) and TL(n+5). That is, during coarse magnetic field touch detection, two (or more) drive electrodes can be bundled together and the drive signal TSVCOM supplied. This strengthens the generated magnetic field during coarse magnetic field touch detection, improving detection accuracy.

[0356] An example of performing magnetic field touch detection during touch detection periods CSS21 to CSS2p has been described. However, if no pen touch is detected during the first period TF1, electric field touch detection is performed during touch detection periods CSS21 to CSS2p. Therefore, it is possible to detect whether a finger is touching the screen in the entire area of ​​the display panel 2 during the second period TF2.

[0357] For example, the switch control circuits SWL and SWR can be controlled by a switching control signal based on the control signal Y-CNT, thereby enabling switching between coarse and fine magnetic field touch detection via the control signal Y-CNT. When the switching control signal indicates coarse magnetic field touch detection, if the switch control circuits SWL and SWR supply a drive signal TSVCOM and a ground voltage Vss to a pair of drive electrodes configured such that they are separated by a drive electrode corresponding to the unit drive circuit that outputs the selection signal, and by an adjacent drive electrode separated by that drive electrode, coarse magnetic field touch detection can be performed.

[0358] In addition, such as Figure 26 As shown, when the unit drive circuit and the drive electrode correspond respectively, by changing the timing of supplying the selection information SEI, which represents the selection, to the shift register composed of the unit drive circuit, it is possible to switch between coarse magnetic field touch detection and fine magnetic field touch detection.

[0359] <Magnetic field touch detection action>

[0360] Figure 25 This is a timing diagram showing the relationship between the touch detection period and the display period. For example... Figure 26 As shown, touch detection periods CSS11–CSS1p, CSS21–CSS2p and display periods DPS1–DPSp are generated alternately. Figure 26 In the example, it indicates that the display period will occur after the touch detection period. Additionally, in... Figure 26In this diagram, to centrally represent the touch detection periods CSS11~CSS1p and CSS21~CSS2p, the touch detection periods are represented by the appendix CSS. Similarly, to centrally represent the display periods DPS1~DPSp, the display periods are represented by the appendix DP. Furthermore, in... Figure 26 The text indicates the case where magnetic field touch detection is performed within the CSS during touch detection. It should be noted that... Figure 26 In the diagram, the horizontal axis also represents time t.

[0361] Figure 8 (A) is a schematic timing diagram illustrating the configuration of magnetic field touch detection performed during the touch detection period (CSS). The touch detection period includes the magnetic field generation period (TGT), the magnetic field detection period (TDT), and the pre-charge period (RST). During the pre-charge period (RST), the voltages of the drive electrodes TL(0) to TL(p), signal lines SL(0) to SL(p), etc., are pre-charged to predetermined values ​​in preparation for the subsequent display period (DPS).

[0362] As explained above, the magnetic field generation period (TGT) is the period during which the magnetic field is generated, and the magnetic field detection period (TDT) is the period during which the magnetic field from the pen is detected by the magnetic field detection coil. Figure 26 The control circuit D-CNT shown enables the magnetic field enable signal SC_EN during touch detection in CSS, as follows: Figure 26 As shown in (C), the level changes from high to low. This specifies magnetic field touch detection. Additionally, the control circuit D-CNT, during the magnetic field generation period TGT, as shown... Figure 26 As shown in (B), the drive signal TSVCOM is changed periodically. Thus, as described above, the drive signal TSVCOM is supplied to a pair of drive electrodes arranged between the drive electrodes, generating a magnetic field corresponding to the change of the drive signal TSVCOM, and the magnetic fields overlap in the region of the drive electrodes sandwiched between the pair of drive electrodes.

[0363] The magnetic field generated during the magnetic field generation period (TGT) charges the capacitive elements inside the pen. If the pen touches the screen, during the magnetic field detection period (TDT), the magnetic field generated by the pen is detected by the magnetic field detection coil, and a detection signal corresponding to the detected magnetic field is output from the magnetic field detection coil. Additionally, during the display period (DPS), the control circuit (D-CNT)... Figure 27 As shown in (B), the drive signal TSVCOM is set to a predetermined voltage, and the magnetic field enable signal SC_EN is set to a high level.

[0364] Next, use Figure 8 This illustrates an example of a detection circuit that determines whether a pen is being touched based on a detection signal from a magnetic field detection coil. Figure 26In the example shown, a detection circuit for detecting touch is constructed using an amplifier circuit AMP and a touch semiconductor device 6. However, here, an example using a microcontroller MCU is presented.

[0365] Figure 26 (D)~ Figure 27 (F) is used to explain Figure 27 The timing diagram of the detection circuit shown is shown. Therefore, in the... Figure 26 In explaining the structure and operation of the detection circuit shown, refer to... Figure 26 (D)~ Figure 27 (F).

[0366] exist Figure 19 In this context, MPX is a multiplexer (selector) comprising multiple switches SWA0 to SWAp. During the magnetic field detection TDT, as described in Embodiment 1, magnetic field detection coils CY(0) to CY(p) are constructed via signal lines SL(0) to SL(p) or detection electrodes RL(0) to RL(p). One end of each of these magnetic field detection coils is connected to one end of the corresponding switch SWA0 to SWAp, and the other end of each is connected to the ground voltage Vss. For example, via... Figure 26 The magnetic field detection coil CY(0), formed by connecting two parallel signal lines, has one end connected to one end of switch SWA0, and the other end connected to the ground voltage Vss. Similarly, the remaining magnetic field detection coils CY(1) to CY(p) are connected between one end of the corresponding switches SWA1 to SWAp and the ground voltage Vss.

[0367] Additionally, the other end of each of switches SWA0 to SWAp is connected to node nA. Regarding switches SWA0 to SWAp, during the magnetic field detection time (TDT), one of them is selected to be in the ON state. This selection is performed by the microcontroller (MCU). That is, a selection signal from the MCU selects one of switches SWA0 to SWAp to be in the ON state. Figure 26 (D) represents the waveform of the selection signal SC_SEL that turns one of the switches SWA0 to SWAp on. ​ In (D), the selection signal SC_SEL changes from high level to low level, thus turning the switch on.

[0368] During the magnetic field detection period TDT, one of the switches SWA0 to SWAp becomes an on state, thereby transferring a detection signal in the magnetic field detection coil to the node nA. The detection signal in the node nA is supplied to a gain circuit, and amplified by the gain circuit. The amplified detection signal is supplied to a filter circuit for removing noise, and the output of the filter circuit is rectified by a rectifier circuit, and supplied to an integration circuit. The output of the integration circuit is supplied to the microcontroller MCU.

[0369] Although not shown, the microcontroller MCU has an analog / digital conversion circuit, a clock signal generation circuit, a nonvolatile memory in which a program is stored, and a processing unit which operates in accordance with the program stored in the nonvolatile memory. The output from the above-described integration circuit is supplied to the analog / digital conversion circuit via a terminal ADC of the microcontroller MCU, and converted into a digital signal. The digital signal obtained by the conversion is processed by the processing unit, and it is determined whether the pen is close to one of the coils CY(0) to CY(p).

[0370] The processing unit in the microcontroller MCU forms a control signal in accordance with the program. As the control signal, there are a selection signal for selectively turning on the switches SWA0 to SWAp, an enable signal EN, and a reset signal rst. In addition, a clock signal MCLK which periodically changes in voltage is generated by the clock signal generation circuit in the microcontroller MCU.

[0371] The clock signal MCLK is supplied to a buffer circuit BF. The buffer circuit BF is controlled by the enable signal EN. When the enable signal EN is at a high level, the clock signal MCLK is supplied to the node nA via a resistor Rll. On the other hand, when the enable signal EN is at a low level, the output of the buffer circuit BF becomes a high impedance state (Hi-Z).

[0372] The gain circuit has resistors R8 to R10, an operational amplifier OP4, and a capacitor element CP3 for DC cut. The detection signal is supplied to the noninverting input (+) of the operational amplifier OP4, the inverting input (-) of the operational amplifier OP4 is connected to a ground voltage Vss via a resistor R9, and to the output of the operational amplifier OP4 via a resistor R8.

[0373] The filter circuit has resistors R4 to R7, a capacitor element CP2, and an operational amplifier OP3. The noninverting input (+) of the operational amplifier OP3 is connected to the ground voltage Vss via a resistor R7, and is supplied with the output signal from the gain circuit via the capacitor element CP2. In addition, the inverting input (-) of the operational amplifier OP3 is connected to the ground voltage Vss via a resistor R6, and to the output of the operational amplifier via a resistor R5. Furthermore, the output of the operational amplifier OP3 is connected to the input of the filter circuit via a resistor R4.

[0374] The rectification circuit has resistors R1 to R3, an operational amplifier OP2, and a diode D. The noninverting input (+) of the operational amplifier is connected to the ground voltage Vs via the resistor R3, and the inverting input (-) of the operational amplifier OP2 is supplied with the output from the filter circuit via the resistor R2. Further, the output of the rectification circuit is supplied via the resistor R1. The output of the operational amplifier OP2 is output via the diode D.

[0375] The integration circuit has a capacitor element CP1, a switch SWAA which receives a reset signal rst as a switch control signal, and an operational amplifier OP1. The noninverting input (+) of the operational amplifier is connected to the ground voltage Vss, and the inverting input (-) is connected to the output of the integration circuit via the capacitor element CP1. Further, the switch SWAA is connected between the output and the input of the integration circuit.

[0376] In Figure 26 , at time t0, the reset signal rst becomes low. Due to this, the switch SWAA becomes in an off state, and the reset is released. At this time, the microcontroller MCU makes the enable signal EN high. Due to this, the clock signal CLK is supplied from the buffer circuit BF to the node nA via the resistor R11.

[0377] The clock signal CLK supplied to the node nA is also supplied to the gain circuit. The output OUT1 of the gain circuit varies according to the voltage variation of the clock signal MCLK, and thus varies as shown in (E) of Figure 26 . The output OUT1 of the gain circuit is supplied to the rectification circuit via the filter circuit, and the rectified output is supplied to the integration circuit. In time t0 to time tl, the voltage of the node nA varies periodically, but there is no variation on the envelope, and thus the output of the integration circuit becomes a certain value.

[0378] At time tl, the microcontroller MCU makes the enable signal EN low. Due to this, the node nA becomes in a high impedance state (Hi-Z). Further, at time tl, the switch SWA3 corresponding to the coil CY(3), for example, becomes in an on state by the selection signal SC_SEL Figure 26 (D). Due to this, one end of the coil CY(3) becomes in a state of being connected to the node nA.

[0379] At this time, since there is a pen in the vicinity of the coil CY(3), an induced voltage is generated in the coil in the pen by the magnetic field generated in the magnetic field generation period TGT from time t0 to t2, and the capacitor element C Figure 2 is charged.

[0380] At time t1, the coil L1 inside the pen generates a magnetic field based on the amount of charge charged in the capacitor element C. The change in the magnetic field generated by the coil L1 induces a voltage in the coil CY(3).

[0381] As a result, the output OUT1 of the gain circuit is as follows: Figure 26 As shown in (E), the voltage decays while oscillating. That is, the voltage decays along the envelope. The output OUT1 of the gain circuit decays while oscillating from time t1, therefore the output OUT2 of the integrator circuit is as follows. Figure 26 The value (F) gradually increases. The microcontroller MCU determines the presence of a pen by converting the output OUT2 of the integrating circuit into a digital signal. At this time, the microcontroller MCU selects the on switch among the switches SWA0 to SWAp via the selection signal SC_SEL, thus knowing the position of the selected magnetic field generating coil. Therefore, based on the value of the converted digital signal and the known position of the magnetic field detection coil, it can determine the location of the pen, i.e., the touched position, and the pen pressure. By repeating the above actions, it can determine whether a pen is present and the pen pressure.

[0382] exist Figure 27 In the detection circuit shown, multiple magnetic field detection coils CY(0)~CY(p) can share a gain circuit, a filter circuit, a rectifier circuit, and an integrator circuit, which can suppress the increase in the area occupied by the detection circuit.

[0383] (Implementation Method 4)

[0384] Figure 28 This is a top view showing the configuration of the display device 1 according to Embodiment 4. Figure 28 The image shows a schematic top view of display panel 2.

[0385] exist Figure 28 In the figure, Tx1-1 to TxN-M represent driving electrodes (detection electrodes) arranged in a dot matrix in the display panel 2. These dot matrix driving electrodes can detect, for example, changes in charge, such as whether a finger is touching the screen. In this figure, driving electrodes arranged in a dot matrix configuration, arranged in 5 rows and 5 columns, are shown as an example. Additionally, SDL(1) to SDL(m) represent detection signal lines, and GL(1) to GL(n) represent scan lines. In the display panel 2, detection signal lines SDL(1) to SDL(m) are arranged parallel to signal lines SL(0) to SL(p) (not shown). For example, if referring to… Figure 10To describe it, the signal lines SL(n-6) to SL(n+9) extend in the column direction and are arranged in parallel in the row direction, but the detection signal lines SDL(1) to SDL(m) are similar to these signal lines SL(0) to SL(p), extending in the column direction and arranged in parallel in the row direction.

[0386] The driving electrodes Tx1-1 to TxN-M, arranged in a dot matrix, are connected one-to-one with the corresponding detection signal lines SDL(1) to SDL(m). For example, the driving electrodes Tx1-1, Tx1-2, Tx1-3, Tx1-17, and Tx1-M arranged in the first row of the dot matrix are connected one-to-one with the corresponding detection signal lines SDL(1), SDL(n+1), SDL(2n+1), SDL(k+1), and SDL(mn). In addition, the driving electrodes TxN-1, TxN-2, TxN-3, TxN-17, and TxN-M arranged in the Nth row of the dot matrix are connected one-to-one with the corresponding detection signal lines SDL(n), SDL(2n), SDL(3n), SDL(k+n), and SDL(m).

[0387] In this fourth embodiment, touch by finger is detected by detecting changes in the signals in each of the detection signal lines SDL(1) to SDL(m). In this case, each detection signal line corresponds one-to-one with a drive electrode, so the position of the touch can be determined by detecting changes in the signals in the detection signal lines SDL(1) to SDL(m).

[0388] Figure 29 This is a circuit diagram illustrating the principle of touch detection using drive electrodes Tx1-1 to TxN-M arranged in a dot matrix configuration. Here, we will use drive electrodes TxN-M as an example for explanation. Figure 29 In the diagram, OP5 represents an operational amplifier, CP5 represents a capacitor, and SWD1 to SWD3 represent switches.

[0389] A parasitic capacitance C2 exists between the driving electrode TxN-M and the ground voltage Vss. First, switch SWD3 is turned on, while switches SWD1 and SWD2 are turned off. As a result, the charge accumulated in capacitor CP5 is discharged through switch SWD3. Next, switch SWD3 is turned off, while switch SWD1 is turned on. At this point, if a finger touches the driving electrode TxN-M, charge is also added to the capacitance between the finger and the electrode.

[0390] Next, switch SWD1 is turned off and switch SWD2 is turned on. By utilizing the feedback from capacitor CP5, the two inputs of operational amplifier OP5 are hypothetically made to have the same potential (at...). Figure 29The charge accumulated in the driving electrode TxN-M is transferred to the capacitor element CP5 because the ground voltage Vss is zero. Therefore, if a finger touches the driving electrode TxN-M, more charge moves to the capacitor element CP5. As a result, the absolute value of the voltage output from the operational amplifier OP5 becomes larger. The voltage (signal) output from the operational amplifier OP5 changes depending on whether a finger touches the driving electrode TxN-M. The presence or absence of finger touch is detected by this signal change. That is, the signal output from the operational amplifier OP5 becomes the sensing signal S.

[0391] Thus, by detecting changes in the signals in each of the driving electrodes Tx1-1 to TxN-M, it is possible to detect touch using a finger. Figure 29 In the detection method shown, switch SWD1 is turned on, a drive signal is supplied to the drive electrode (e.g., TxN-M), and the touch of a finger is detected by detecting changes in the signal in the same drive electrode TxN-M. That is, the touch of a finger is detected based on the signal change in the drive electrode to which the drive signal has been supplied. Therefore, this is a so-called electrostatic capacitance self-detection method.

[0392] Scan lines GL(1) to GL(n) are configured to be orthogonal to detection signal lines SDL(1) to SDL(m) and signal lines SL(1) to SL(m) (not shown). In this fourth embodiment, when magnetic field touch detection is performed, the scan lines GL(1) to GL(n) are used as signal wiring to generate a magnetic field. That is, during the magnetic field generation period TGT, the scan lines GL(1) to GL(n) are used as the drive electrodes TL(0) to TL(p) described in the first embodiment. Although not particularly limited, multiple scan lines can be bundled together and used as a single drive electrode. Figure 28 In the example shown, 20 scan lines form a bundle. That is, scan lines GL(1) to GL(20) form a bundle, scan lines GL(21) to GL(40) form a bundle, scan lines GL(41) to GL(60) form a bundle, scan lines GL(61) to GL(80) form a bundle, and scan lines GL(n-19) to GL(n) form a bundle.

[0393] During the magnetic field generation period TGT, a drive signal is supplied to the bundled scan lines in the same manner as in Embodiment 1. For example, a drive signal TSVCOM is supplied from the side 2-L of the display panel 2 to the end of one of the bundled scan lines GL(1) to GL(20), and a ground voltage Vss is supplied from the side 2-R of the display panel 2 to the other end. At this time, for example, a ground voltage Vss is supplied from the side 2-L of the display panel 2 to the end of one of the bundled scan lines GL(41) to GL(60), and a drive signal TSVCOM is supplied from the side 2-R of the display panel 2 to the other end. As a result, magnetic fields are generated in the bundle of scan lines GL(1) to GL(20) and the bundle of scan lines GL(41) to GL(60), and the magnetic fields overlap in the region of scan lines GL(21) to GL(40).

[0394] In this fourth embodiment, driving electrodes Tx1-1 to TxN-M and detection signal lines SDL(1) to SDL(m) are formed in the TFT glass substrate TGB, and a magnetic field detection coil is constructed using detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB. The magnetic field detection coil constructed using the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB is as follows: Figure 21 The description is omitted here. In Embodiment 4, finger touch is detected by driving electrodes formed in the TFT glass substrate TGB and arranged in a dot matrix. Therefore, it is not necessary to use the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB for detecting finger touch, so the detection electrodes RL(0) to RL(p) can be fixed in a shape suitable for detecting magnetic fields (e.g., a coil shape).

[0395] Furthermore, in Embodiment 4, multiple scan lines are bundled together, thus reducing the combined resistance of the scan lines during TGT (Time To Gain) of magnetic field generation and enhancing the generated magnetic field.

[0396] <Variation Example 1>

[0397] exist Figure 28 The description explains that the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB are used for magnetic field detection. In this modified example, the... Figure 28 The detection electrodes TX1-1 to TxN-M shown are used for magnetic field detection. Therefore, in the CF glass substrate CGB, there is no need to configure detection electrodes RL(0) to RL(p) for magnetic field detection, which can be manufactured inexpensively.

[0398] <Variation Example 2>

[0399] Figure 38is a plan view showing the configuration of the display device 1 according to Modification 2 of Embodiment 4. In Figure 38 , a schematic plan view of the display panel 2 is shown. Figure 38 is similar to Figure 28 , and thus only the points of difference will be described here.

[0400] In Modification 2 shown in Figure 38 , the detection signal lines SDL(1)P to SDL(m)P and the paired detection signal lines SDL(1) to SDL(m) extend in parallel. In Figure 28 , in order to avoid the drawing becoming complex, only the detection signal lines paired with the detection signal lines SDL(1), SDL(2), and SDL(n) are labeled with the reference numerals SDL(1)P, SDL(2)P, and SDL(n)P, and the reference numerals of the other detection signal lines are omitted.

[0401] Here, in Figure 38 , the case of the 1 column (driving electrodes Tx1-1 to TxN-1) disposed at the leftmost side will be described, but the same applies to the other columns. The detection signal line SDL(1) and the detection electrode SDL(1)P extend in parallel, and are connected to the driving electrode Tx1-1. The detection signal line SDL(2) and the detection electrode SDL(2)P also extend in parallel, and are connected to the driving electrode Tx2-1. Subsequently, in the same manner, the detection signal line SDL(n) and the detection electrode SDL(n)P extend in parallel, and are connected to the driving electrode TxN-1.

[0402] When magnetic field touch detection is performed, magnetic field detection coils are formed by the paired detection signal lines extending in parallel. For example, a magnetic field detection coil is formed by the paired detection signal lines SDL(1) and SDL(1)P, a magnetic field detection coil is formed by the paired detection signal lines SDL(2) and SDL(2)P, and a magnetic field detection coil is formed by the paired detection signal lines SDL(n) and SDL(n)P. In this case, the change in signal of one of the paired detection signal lines, for example, the detection signal lines SDL(1), SDL(2), and SDL(n), is output as a sensing signal S. At this time, the other of the paired detection signal lines, the detection signal lines SDL(1)P, SDL(2)P, and SDL(n)P, are supplied with a ground voltage Vss, respectively.

[0403] In the detection signal lines SDL(1) to SDL(m) and SDL(1)P to SDL(m)P, magnetic field detection coils are formed, respectively, and thus it is not necessary to dispose detection electrodes for magnetic field detection in the CF glass substrate CGB, and thus the display device 1 can be manufactured inexpensively. In addition, it is possible to perform magnetic field touch detection in the same manner as in Figure 28The same as the case described above, electric field touch detection is performed.

[0404] In addition, only the detection signal lines of a specific pair among the pairs of detection signal lines arranged in the 1st column (drive electrodes Tx1-1 to TxN-1) can be used to detect a magnetic field when magnetic field touch detection is performed. As the detection signal lines of the specific pair, the detection signal lines SDL(1), SDL(1)P shown in the drawing correspond. The detection signal lines SDL(1), SDL(1)P are connected to the drive electrode Tx1-1 arranged in the 1st row, so the number of orthogonal scan lines increases, and the range that can be detected when magnetic field touch detection is performed widens, so it is suitable for use in magnetic field touch detection. In the other columns of the dot matrix, the same as above, the detection signal lines of the pair among the pairs of detection signal lines included in each column that are connected to the drive electrodes Tx1-2 to Tx1-M arranged in the 1st row are used as magnetic field detection coils when magnetic field touch detection is performed. Figure 38

[0405] <Modification Example Three>

[0406] Figure 39 is a plan view showing the configuration of the display device 1 according to Modification Example Three of Embodiment Four. In Figure 39 , a schematic plan view of the display panel 2 is shown. Figure 39 is similar to Figure 28 , so only the points of difference will be described here.

[0407] In Figure 28 , the detection signal lines extend to the regions connected to the corresponding drive electrodes. In this Modification Example Three, the detection signal lines SDL(1) to SDL(m) each extend across the display panel 2. For example, they are arranged so as to extend from the edge 2-D to the edge 2-U of the display panel 2. Here, the 1st column (drive electrodes Tx1-1 to TxN-1) of the dot matrix will be described as an example, but the same applies to the other columns.

[0408] The detection signal line SDL(1) extends from the edge 2-D to the edge 2-U, and in the middle it is connected to the drive electrode Tx1-1. The detection signal line SDL(2) also extends from the edge 2-D to the edge 2-U, and in the middle it is connected to the drive electrode Tx2-1. In the same way, the detection signal line SDL(n) also extends from the edge 2-D to the edge 2-U, and in the middle it is connected to the drive electrode TxN-1.

[0409] On the edge 2-U side, switches SDS are connected between predetermined detection signal lines. In Figure 39 , only the switches SDS connected between the detection signal lines SDL(1) and SDL(2), and the switches SDS connected to the detection signal lines SDL(3) and SDL(n) are shown.​

[0410] When the magnetic field touch detection, the switch SDS and Figure 19 the eighth switch k00~kp shown is similarly turned on. Thus, connecting between a plurality of detection signal lines. In Figure 39 the example, the detection signal line SDL(1) and SDL(2) are connected on the side 2-U. Thus, when the magnetic field touch detection, by the detection signal line SDL(1), SDL(2), forming a magnetic field detection coil. At this time, for example, the detection signal line SDL(2), supply ground voltage Vss, the signal in the detection signal line SDL(1) as a sensor signal S output changes.

[0411] Thus, using the detection signal line SDL(1) ~ SDL(m) to form a magnetic field detection coil, therefore need not be configured in the CF glass substrate CGB for magnetic field detection detection electrode, therefore can be manufactured at a low cost. In addition, can be with the case described in Figure 28 the same, the electric field touch detection.

[0412] In Figure 39 described an example using adjacent detection signal line SDL(1), SDL(2) to form a magnetic field detection coil, but not limited to this. That is, also can be configured in the manner of detection signal line with detection signal line in the middle of the connection between the detection signal line by the switch, to make the formation of each other overlapping magnetic field detection coil. In addition, can not be a single winding, but 1.5 winding or more.

[0413] <Variant four>

[0414] Figure 30 is a top view showing the configuration of the display device 1 according to the fourth variant of the embodiment. Figure 30 Similar to Figure 28 , thus here mainly explain the difference. In Figure 30 , SL(0) ~ SL(p) represents a signal line. As explained in Figure 28 , the detection signal line SDL(1) ~ SDL(m) in the display panel 2, with the signal line SL(0) ~ SL(p) is configured in parallel.

[0415] In this variant, the signal line SL(0) ~ SL(p) used as a signal line to generate a magnetic field. Although not particularly limited, in this variant, a plurality of signal lines in a bundle, during the magnetic field generation TGT, is supplied with a drive signal TSVCOM. If with Figure 30For an example, during the magnetic field generation period TGT, the signal lines SL(0) to SL(19) are bundled, the signal lines SL(20) to SL(39) are bundled, and the signal lines SL(40) to SL(59) are bundled. Further, the signal lines SL(k) to SL(k+19) are bundled, and the signal lines SL(p-19) to SL(p) are bundled.

[0416] During the magnetic field generation period TGT, a drive signal is supplied to the bundled signal lines. For example, with respect to one end portion of the bundled signal lines SL(0) to SL(19), a drive signal TSVCOM is supplied on the side 2-U of the display panel 2, and a ground voltage Vss is supplied to the other end portion on the side 2-D of the display panel 2. At this time, for example, with respect to one end portion of the bundled signal lines SL(40) to SL(59), a ground voltage Vss is supplied on the side 2-U of the display panel 2, and a drive signal TSVCOM is supplied to the other end portion on the side 2-D of the display panel 2. Thus, during the magnetic field generation period TGT, a magnetic field which is superimposed is formed in the region of the signal lines SL(20) to SL(39).

[0417] In the case of this modification example, the magnetic field detection coil is constituted by the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB, for example. In the case where the magnetic field detection coil is formed by the detection electrodes RL(0) to RL(p), the detection electrodes RL(0) to RL(p) are formed to be orthogonal to the signal lines SL(0) to SL(p) and parallel to each other, and are connected between predetermined detection electrodes, as shown in FIG. 12, for example. Figure 21 The magnetic field detection coil can also be formed by the scan lines GL(0) to GL(p).

[0418] Further, the magnetic field can also be detected by the detection electrodes Tx1-1 to TxN-M. If the magnetic field is detected by the detection electrodes Tx1-1 to TxN-M, it is not necessary to provide the detection electrodes for the magnetic field detection in the CF glass substrate CGB, for example, and it is possible to manufacture at a low cost.

[0419] <Modification Example Five>

[0420] Figure 40 is a plan view showing the configuration of the display device 1 according to Modification Example Five of Embodiment Four. Figure 40 Similar to Figure 30 , the main points of difference will be mainly described here. In this Modification Example Five, the detection signal lines SDL(1)L to SDL(m)L which extend in parallel to the detection signal lines SDL(1) to SDL(m), respectively, are provided. In Figure 40In the present embodiment, in order to avoid the drawing becoming complicated, only with respect to the detection signal lines arranged in the drive electrodes Tx1-1 to TxN-1 of the first column, reference signs SDL(1)L, SDL(2)L, and SDL(n)L are marked.

[0421] Here, the first column of drive electrodes is taken as an example for explanation, but the same applies to the other columns. The detection signal line SDL(1)L extends in parallel with the detection signal line SDL(1), and the detection signal line SDL(1) and the detection signal line SDL(1)L are connected in a manner that forms a loop LPP in the region of the drive electrode Tx1-1 that connects the detection signal line SDL(1). Also, the detection signal line SDL(2)L extends in parallel with the detection signal line SDL(2), and the detection signal line SDL(2) and the detection signal line SDL(2)L are connected in a manner that forms a loop LPP in the region of the drive electrode Tx2-1 that connects the detection signal line SDL(2). Hereafter, in the same manner, the detection signal line SDL(n)L extends in parallel with the detection signal line SDL(n), and the detection signal line SDL(n) and the detection signal line SDL(n)L are connected in a manner that forms a loop LPP in the region of the drive electrode TxN-1 that connects the detection signal line SDL(n).

[0422] The loop LPP is formed, for example, by the detection signals that connect to each other being bent and connected when viewed in plan.

[0423] In this modification example five, the loop LPP functions as a magnetic field detection coil. That is, when magnetic field touch detection is performed, the signal change in the detection signal line of one of the detection signal lines that connect to each other becomes the sensing signal S, and the other detection signal line is supplied with the ground voltage Vss. Thus, if the vicinity of the drive electrode is touched by the pen, a signal change occurs in the detection signal line that forms the loop LPP in the region of the drive electrode by the magnetic field from the pen, and it is possible to calculate the touch by the pen and the coordinates.

[0424] For example, in the case where the detection signal lines SDL(1)L, SDL(2)L to SDL(n)L are respectively set as the other detection signal line of the detection signal line that forms the loop, the ground voltage Vss is supplied to these detection signal lines SDL(1)L, SDL(2)L to SDL(n)L. At this time, the signal change in the detection signal lines SDL(1), SDL(2) to SDL(n) that become the one detection signal line of the detection signal line that forms the loop is detected as the sensing signal S. Thus, it is possible to detect which part of the first column is touched by the pen, and it is possible to detect which row (which region of the drive electrodes Tx1-1 to TxN-1) is touched in the first column.

[0425] In this modification five, the detection signal line is also used as the magnetic field detection coil, so that inexpensive manufacturing is possible. In addition, electric field touch detection can be performed similarly to the modification four. Moreover, the detection signal line can be shared in the magnetic field detection and the electric field detection, so that the price of the display device capable of magnetic field touch detection and electric field touch detection can be suppressed from rising.

[0426] (Modification five)

[0427] In the modifications one to four, mainly the case where the signal lines SL(0) to SL(p) orthogonal to the signal wiring are used in the display panel 2, and the magnetic field is generated at the magnetic field generation period TGT, has been described. In this modification five, the case where the signal wiring arranged in parallel to the signal lines SL(0) to SL(p) is used in the display panel 2, and the magnetic field is generated at the magnetic field generation period TGT, is described. Here, the case where the driving electrodes are used as the signal wiring arranged in parallel to the signal lines SL(0) to SL(p) is described.

[0428] Figure 31 is a schematic plan view showing the configuration of the display device 1 according to the modification five. In Figure 31 , the portion related to the display panel 2 is shown. In the display panel 2, a plurality of signal lines SL(0) to SL(p), a plurality of scan lines GL(0) to GL(p), and a plurality of driving electrodes TL(0) to TL(p), and the like are arranged, but in Figure 31 , the display panel 2 in which the signal lines SL(0) to SL(7), the scan lines GL(0) to GL(3), and the driving electrodes TL(0) to TL(7) are arranged is shown for easy description. The signal lines SL(0) to SL(7) are arranged in parallel in the row direction in the display panel 2. In this modification five, the driving electrodes TL(0) to TL(7) to which the driving signal is supplied are arranged in parallel to the signal lines SL(0) to SL(7) at the magnetic field generation period TGT. That is, the driving electrodes TL(0) to TL(7) are also arranged in parallel in the row direction in the display panel 2.

[0429] The scan lines GL(0) to GL(3) extend in the row direction and are arranged in parallel in the column direction in the display panel 2. In this Embodiment 5, although not particularly limited, the gate driver 5-1 and the gate driver 5-2 are arranged along the side 2-L and the side 2-R of the display panel 2, respectively. The scan lines GL(0) to GL(3) are connected to the gate driver 5-1 on the side 2-L and are connected to the gate driver 5-2 on the side 2-R. In the display panel 2, when display is performed, the gate driver 5-1 supplies a scan line signal of, for example, a high level to the scan line GL(0), and at the next timing, the gate driver 5-2 supplies a scan line signal of a high level to the next scan line GL(1). That is, to the scan lines GL(0) to GL(3), a scan line signal of a high level is alternately supplied from the gate drivers 5-1 and 5-2. Thus, it is possible to prevent the frame from becoming large.

[0430] In Figure 31 , 3 denotes a signal line selector. In Figure 8 and the like, the signal line selector 3 is described, and thus the description thereof is omitted. In the drawing, SCW-D and SCW-U denote connection circuits that electrically connect the signal lines SL(0) to SL(7) and the common electrodes TL(0) to TL(7) that overlap when viewed from above at the time of touch detection. That is, at the time of touch detection, the connection circuit SCW-D connects the common electrode TL(0) and the signal line SL(0) on the side 2-D, and the connection circuit SCW-U connects the common electrode TL(0) and the signal line SL(0) on the side 2-U. Similarly, at the time of touch detection, the common electrode TL(1) and the signal line SL(1) are connected by the connection circuits SCW-D and SCW-U. The remaining common electrodes and signal lines are also similarly electrically connected at the time of touch detection. Thus, at the time of touch detection, the common electrodes and the signal lines that overlap when viewed from above are connected in parallel, and it is possible to reduce the resultant resistance.

[0431] In Figure 31 , SU-R and SD-R denote drive circuits, and SU-C and SD-C denote selection circuits. As with Embodiment 1, the selection drive circuit (first drive circuit or second drive circuit) SSU is configured by the drive circuit SU-R and the selection circuit SU-C, and the selection drive circuit (second drive circuit or first drive circuit) SSD is configured by the drive circuit SD-R and the selection circuit SD-C. The selection drive circuit SSU is arranged along the side 2-U of the display panel 2, and the selection drive circuit SSD is arranged along the side 2-D of the display panel 2.

[0432] During the magnetic field generation period TGT of the magnetic field touch detection, the selection drive circuit SSU supplies a drive signal to one of the selected pair of drive electrodes from the side 2-U and supplies a ground voltage Vss to the other drive electrode. In addition, the selection drive circuit SSD supplies the ground voltage Vss to the other drive electrode of the selected pair of drive electrodes from the side 2-D and supplies a drive signal to one of the drive electrodes. Thus, during the magnetic field generation period TGT, a strong magnetic field is generated between the selected pair of drive electrodes.

[0433] In Figure 31 , VCOM denotes a voltage line to which a predetermined voltage VCOMDC is supplied. In addition, TPL denotes a voltage line to which a ground voltage Vss is supplied, and TPH denotes a voltage line to which a predetermined voltage (for example, a voltage Vp as shown in FIG. 6) is supplied. The selection drive circuits SSU and SSD are connected to the drive electrodes from which the voltage line TPL is selected in order to supply the ground voltage Vss to the selected drive electrodes. In addition, the selection drive circuits SSU and SSD are connected to the drive electrodes from which the voltage line TPH is selected in order to supply a drive signal to the selected drive electrodes. Figure 15

[0434] The magnetic field detection coil is constituted by, for example, the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB. In the case of this Embodiment 5, the detection electrodes RL(0) to RL(p) are arranged in parallel in the column direction in the display panel 2 in the same manner as the scan lines in the row direction. In addition, during the magnetic field detection period TDT, predetermined detection electrodes are connected in a manner that the magnetic field detection coil is formed. In addition, the magnetic field detection coil can be formed by the scan lines GL(0) to GL(3).

[0435] In this Embodiment 5, the selection drive circuit SSD supplies a drive signal to the selected drive electrodes when the electric field touch detection is performed. Thus, an electric field is generated in the selected drive electrodes. In this case, for example, the change in the electric field is detected by the detection electrodes RL(0) to RL(p) or the scan lines GL(0) to GL(3) formed in the CF glass substrate CGB.

[0436] Note that, although not particularly limited, the gate drivers 5-1 and 5-2 have a function of making the scan lines GL(0) to GL(3) floating, for example, during the magnetic field generation period TGT.

[0437] <Configuration of selection drive circuit>

[0438] Figure 32 ​is a circuit diagram showing the configuration of the selection drive circuit SSU, SSD involved in Embodiment Five. Figure 32 is a schematic diagram, but is depicted in combination with the actual configuration. In this diagram, the portions of the selection drive circuit SSU, SSD corresponding to the drive electrodes TL(0) to TL(6) are shown. Figure 31

[0439] As shown in Figure 31 , the selection drive circuit SSU is arranged along the edge 2-U of the display panel 2, and the selection drive circuit SSD is arranged along the edge 2-D of the display panel 2. The drive circuits SU-R within the selection drive circuit SSU include unit drive circuits USU(0) to USU(6) corresponding to the drive electrodes TL(0) to TL(6), respectively, arranged along the edge 2-U. Likewise, the drive circuits SD-R within the selection drive circuit SSD include unit drive circuits USD(0) to USD(6) corresponding to the drive electrodes TL(0) to TL(6), respectively, arranged along the edge 2-D.

[0440] In this Embodiment Five, the voltage wirings TPL and TPH are arranged so as to surround the display panel 2. If an example is described using the module shown in Figure 9 , the voltage wirings TPL and TPH are arranged so as to pass through the areas between the edge 2-L of the display panel 2 and the edge 900-L of the module 900, between the edge 2-U of the display panel 2 and the edge 900-U of the module 900, between the edge 2-R of the display panel 2 and the edge 900-R of the module 900, and between the edge 2-D of the display panel 2 and the edge 900-D of the module 900. That is, the voltage wirings TPL and TPH are arranged in the upper and lower and left and right frame portions of the module 900. On the other hand, the voltage wiring VCOM is arranged in the area between the edge 2-D of the display panel 2 and the edge 900-D of the module 900.

[0441] The selection circuits SU-C within the selection drive circuit SSU in this Embodiment Five include unit selection circuits UUC(0) to UUC(6) corresponding to the unit drive circuits USU(0) to USU(6), respectively. The unit selection circuits UUC(0) to UUC(6) each include a tenth switch USW1 and an eleventh switch USW2. In each of the unit selection circuits UUC(0) to UUC(6), the tenth switch USW1 is connected between the voltage wiring TPH and the end portion of one side of the corresponding drive electrode, and is switched on and off by a selection signal from the corresponding unit drive circuit, and the eleventh switch USW2 is connected between the voltage wiring TPL and the end portion of one side of the corresponding drive electrode, and is switched on and off by a selection signal from the corresponding unit drive circuit. ​

[0442] That is, in the unit selection circuit UUC(0), the tenth switch USWl is connected between the end portion of one side of the voltage line TPH and the drive electrode TL(0), and is switched controlled by the selection signal ClO from the unit selection circuit USU(0). Also, in the unit selection circuit UUC(0), the eleventh switch USW2 is connected between the end portion of one side of the voltage line TPL and the drive electrode TL(0), and is switched controlled by the selection signal C20 from the unit selection circuit USU(0). In the unit selection circuit UUC(l), the tenth switch USWl, the eleventh switch USW2 are connected between the end portion of one side of the voltage lines TPH, TPL and the drive electrode TL(l), and are switched controlled by the selection signals Cll, C21 from the unit selection circuit USU(l). In the unit selection circuit UUC(2), the tenth switch USWl, the eleventh switch USW2 are connected between the end portion of one side of the voltage lines TPH, TPL and the drive electrode TL(2), and are switched controlled by the selection signals C12, C22 from the unit selection circuit USU(2).

[0443] Likewise, in the unit selection circuit UUC(3), the tenth switch USWl, the eleventh switch USW2 are connected between the end portion of one side of the voltage lines TPH, TPL and the drive electrode TL(3), and are switched controlled by the selection signals C13, C23 from the unit selection circuit USU(3), in the unit selection circuit UUC(4), the tenth switch USWl, the eleventh switch USW2 are connected between the end portion of one side of the voltage lines TPH, TPL and the drive electrode TL(4), and are switched controlled by the selection signals C14, C24 from the unit selection circuit USU(4). In the unit selection circuit UUC(5), the tenth switch USWl, the eleventh switch USW2 are connected between the end portion of one side of the voltage lines TPH, TPL and the drive electrode TL(5), and are switched controlled by the selection signals C15, C25 from the unit selection circuit USU(5), in the unit selection circuit UUC(6), the tenth switch USWl, the eleventh switch USW2 are connected between the end portion of one side of the voltage lines TPH, TPL and the drive electrode TL(6), and are switched controlled by the selection signals C16, C26 from the unit selection circuit USU(6).

[0444] The drive circuit SD-R in the drive selection circuit SSD also includes unit drive circuits USD(0) to USD(6) corresponding to the drive electrodes TL(0) to TL(6), respectively. Further, the selection circuit SD-L includes unit selection circuits UDC(0) to UDC(6) corresponding to the drive electrodes and the unit drive circuits, respectively. The unit selection circuits UDC(0) to UDC(6) each include a twelfth switch USW3, a thirteenth switch USW4, and a fourteenth switch USW5 that are switched on and off by a control signal from the corresponding unit selection circuit. Here, the twelfth switch USW3 is connected between the other end of the corresponding drive electrode and the voltage line VCOM, the thirteenth switch USW4 is connected between the other end of the corresponding drive electrode and the voltage line TPL, and the fourteenth switch USW5 is connected between the other end of the corresponding drive electrode and the voltage line TPH.

[0445] That is, in the unit selection circuit UDC(0), the twelfth switch USW3 is connected between the other end of the drive electrode TL(0) and the voltage line VCOM, the thirteenth switch USW4 is connected between the other end of the drive electrode TL(0) and the voltage line TPL, and the fourteenth switch USW5 is connected between the other end of the drive electrode TL(0) and the voltage line TPH. Further, the twelfth switch USW3 in the unit selection circuit UDC(0) is switched on and off by a selection signal S30 from the unit drive circuit USD(0), the thirteenth switch USW4 is switched on and off by a selection signal S40 from the unit drive circuit USD(0), and the fourteenth switch USW5 is switched on and off by a selection signal S40 from the unit drive circuit USD(0).

[0446] Further, in the unit selection circuit UDC(1), the twelfth switch USW3, the thirteenth switch USW4, and the fourteenth switch USW5 are connected to the other end of the drive electrode TL(1) and the voltage lines VCOM, TPL, and TPH, and are switched on and off by selection signals S31, S41 from the unit drive circuit USD(1). In the unit selection circuit UDC(2), the twelfth switch USW3, the thirteenth switch USW4, and the fourteenth switch USW5 are connected to the other end of the drive electrode TL(2) and the voltage lines VCOM, TPL, and TPH, and are switched on and off by selection signals S32, S42 from the unit drive circuit USD(2). In the unit selection circuit UDC(3), the twelfth switch USW3, the thirteenth switch USW4, and the fourteenth switch USW5 are connected to the other end of the drive electrode TL(3) and the voltage lines VCOM, TPL, and TPH, and are switched on and off by selection signals S33, S43 from the unit drive circuit USD(3).

[0447] Similarly, in the unit selection circuit UDC(4), the twelfth switch USW3, the thirteenth switch USW4, and the fourteenth switch USW5 are connected to the other end of the drive electrode TL(4) and the voltage lines VCOM, TPL, and TPH, and are switched by the selection signals S34, S44 from the unit drive circuit USD(4). In the unit selection circuit UDC(5), the twelfth switch USW3, the thirteenth switch USW4, and the fourteenth switch USW5 are connected to the other end of the drive electrode TL(5) and the voltage lines VCOM, TPL, and TPH, and are switched by the selection signals S35, S45 from the unit drive circuit USD(5). In the unit selection circuit UDC(6), the twelfth switch USW3, the thirteenth switch USW4, and the fourteenth switch USW5 are connected to the other end of the drive electrode TL(6) and the voltage lines VCOM, TPL, and TPH, and are switched by the selection signals S36, S46 from the unit drive circuit USD(6).

[0448] In order to avoid the complexity of the drawings, in each of the unit selection circuits UDC(0) to UDC(6), the thirteenth switch USW4 and the fourteenth switch USW5 are shown as being switched by one selection signal (for example, the selection signal S40), but the thirteenth switch USW4 and the fourteenth switch USW5 are switched by the corresponding unit drive circuits, respectively.

[0449] In this embodiment five, during the magnetic field generation period TGT, the drive signal is supplied to the drive electrode corresponding to the selected unit drive circuit, as in the case described in Figure 22 Similarly to the case described in the embodiment four, the drive signal or the ground voltage Vss is supplied to the drive electrode corresponding to the selected unit drive circuit. In this case, the drive signal corresponds to the predetermined voltage in the voltage line TPH, and the supply of the predetermined voltage in the voltage line TPH corresponds to the supply of the drive signal.

[0450] The unit drive circuits USU(0) to USU(6) each include a shift stage, and the shift stages are connected in series in this order. Similarly, the unit drive circuits USD(0) to USD(6) each include a shift stage, and the shift stages are connected in series in this order. For example, in the unit drive circuits USU(0), USU(1), USD(0), and USD(1), the selection information SEI indicating the selection is shifted in order toward the unit drive circuits USU(6) and USD(6) in synchronization with a clock signal not shown.

[0451] For example, if selection information SEI indicating selection is set in the unit drive circuits USU(0), USU(l), USD(0), and USD(l), at the time of magnetic field generation TGT, the unit drive circuit USU(0) causes the eleventh switch USW2 in the unit selection circuit UUC(0) to be in the on state by the selection signal S20, and causes the tenth switch USWl to be in the off state by the selection signal SlO. At this time, the unit drive circuit USU(l) causes the tenth switch USWl in the unit selection circuit UUC(l) to be in the on state by the selection signal Sl l, and causes the eleventh switch USW2 to be in the off state by the selection signal S21.

[0452] In addition, at this time, the unit drive circuit USD(0) causes the fourteenth switch USW5 to be in the on state and the thirteenth switch USW4 to be in the off state by the selection signal S40. In addition, the unit drive circuit USD(0) causes the twelfth switch USW3 to be in the off state by the selection signal S30. Also, at this time, the unit drive circuit USD(l) causes the thirteenth switch USW4 to be in the on state and the fourteenth switch USW5 to be in the off state by the selection signal S41. In addition, the unit drive circuit USD(l) causes the twelfth switch USW3 to be in the off state by the selection signal S30.

[0453] As a result, the one end portion of the drive electrode TL(0) is connected to the voltage wiring TPL via the eleventh switch USW2 in the unit selection circuit UUC(0), and the other end portion of the drive electrode TL(l) is connected to the voltage wiring TPL via the thirteenth switch USW4 in the unit selection circuit UDC(l). At this time, the other end portion of the drive electrode TL(0) is connected to the voltage wiring TPH via the fourteenth switch USW5 in the unit selection circuit UDC(0), and the one end portion of the drive electrode TL(l) is connected to the voltage wiring TPH via the tenth switch USWl in the unit selection circuit UUC(l). As a result, the one end portion of the drive electrode TL(0) and the other end portion of the drive electrode TL(l) are supplied with the ground voltage Vss, and the other end portion of the drive electrode TL(0) and the one end portion of the drive electrode TL(l) are supplied with a predetermined voltage as a drive signal.

[0454] By the predetermined voltage, a current flowing in the drive electrode TL(0) in a direction from the other end portion toward the one end portion (in the drawing, a direction toward the upper side), and a current flowing in the drive electrode TL(l) in a direction from the one end portion toward the other end portion (in the drawing, a direction toward the lower side) are caused to flow, a magnetic field is generated in each of the drive electrodes TL(0) and TL(l), and the magnetic fields overlap in the region sandwiched between the drive electrodes TL(0) and TL(l).

[0455] Note that at this time, the unit drive circuits USU(2) to USU(6) make the tenth and eleventh switches USWl and USW2 in the respective unit selection circuits UUC(2) to UUC(6) become open states by the selection signals S12 to S16 and S22 to S26. Also, at this time, the unit drive circuits USD(2) to USD(6) make the twelfth, thirteenth, and fourteenth switches USW4, USW4, and USW5 in the respective unit selection circuits UDC(2) to UDC(6) become open states by the selection signals S32 to S36 and S42 to S46. As a result, the drive electrodes TL(2) to TL(6) become high-impedance states.

[0456] If the clock signal changes and the selection information SEI moves to the unit drive circuits USU(l), USU(2), UDC(l), and UDC(2), the unit drive circuit USU(l) makes the tenth switch USWl in the unit selection circuit UUC(l) become an open state and the eleventh switch USW2 become a closed state by the selection signals SIl, S21. At this time, the unit drive circuit USU(2) makes the tenth switch USWl in the unit selection circuit UUC(2) become a closed state and the eleventh switch USW2 become an open state by the selection signals SIl, S21. Also, the unit selection circuit USD(l) makes the fourteenth switch USW5 in the unit selection circuit UDC(l) become a closed state and the twelfth and thirteenth switches USW3 and USW4 become open states by the selection signals S31, S41. Also, the unit selection circuit USD(2) makes the thirteenth switch USW4 in the unit selection circuit UDC(2) become a closed state and the twelfth and fourteenth switches USW3 and USW5 become open states by the selection signals S32, S42.

[0457] As a result, in the drive electrode TL(l), a current flows from the other end portion toward the one end portion thereof, and in the drive electrode TL(2), a current flows from the one end portion toward the other end portion thereof. By this current, magnetic fields are generated in the drive electrodes TL(l) and TL(2), and the magnetic fields are superimposed. At this time, the tenth to fourteenth switches in the respective unit selection circuits UUC(O), UUC(3) to UUC(6) and UDC(O), UDC(3) to UDC(6) become open states, and the drive electrodes TL(O), TL(3) to TL(6) become high-impedance states.

[0458] Subsequently, in synchronization with the clock signal, the selection information SEI is moved toward the unit drive circuits USU(6), USD(6), and the magnetic field is generated in sequence. That is, the magnetic field is generated in the drive electrodes TL(2) and TL(3), in the next timing, the magnetic field is generated in the drive electrodes TL(3) and TL(4), in further next timing, the magnetic field is generated in the drive electrodes TL(4) and TL(5), and next, the magnetic field is generated in the drive electrodes TL(5) and TL(6).

[0459] The direction of the current flowing in the drive electrodes is not limited to the above-described direction. For example, in the case where the magnetic field is generated in the drive electrodes TL(0) and TL(1), the current can flow in the drive electrode TL(0) in the direction from one end toward the other end, and the current can flow in the drive electrode TL(1) from the other end toward the one end. That is, the direction of the current can be made to be exactly opposite between a pair of drive electrodes arranged adjacently.

[0460] The example in which the drive electrodes arranged adjacently to each other are used has been described, but the present application is not limited thereto. For example, the magnetic field can be generated by the drive electrodes arranged in such a manner that one or a plurality of drive electrodes are sandwiched. For example, the selection information SEI indicating the selection can be set in the unit drive circuits USU(0), USC(2), USD(0), and USD(2). Thereby, the magnetic field is generated in a pair of drive electrodes TL(0), TL(2) arranged in such a manner that the drive electrode TL(1) is sandwiched. Subsequently, the selection information SEI is shifted in synchronization with the change of the clock signal, and thereby the magnetic field is generated in the drive electrodes arranged in such a manner that one drive electrode is sandwiched in sequence.

[0461] When the electric field touch detection is performed, the unit drive circuits USU(0) to USU(6) make the tenth switch USWl and the eleventh switch USW2 in the corresponding unit selection circuit UUC(0) to UUC(6) into the open state by the selection signals SlO to S16, S20 to S26, respectively. On the other hand, in the unit drive circuits USD(0) to USD(6), the selection information SEI is moved in sequence. For example, if the selection information SEI is set in the unit drive circuit USD(0), the unit drive circuit USD(0) makes the twelfth switch USW3 into the closed state by the selection signal S30. Thereby, the drive electrode TL(0) is connected to the voltage wiring VCOM via the twelfth switch USW3. In this Embodiment 5, the control circuit D-CNT( Figure 8 ) supplies the electric field drive signal in which the voltage periodically changes to the voltage wiring VCOM in the case of the electric field touch detection. Thereby, when the electric field touch detection is performed, the drive electrode TL(0) generates the electric field in accordance with the electric field drive signal.

[0462] Note that at this time, the thirteenth switch USW4 and the fourteenth switch USW5 in the unit selection circuit UDC(0) become the open state. Also, the twelfth switch USW3, the thirteenth switch USW4, and the fourteenth switch USW5 in each of the remaining unit selection circuits USD(1) to USD(6) also become the open state.

[0463] The electric field is sequentially generated from the drive electrode TL(2) toward TL(6) by moving the selection information SEI from the unit drive circuit USD(0) toward USD(6).

[0464] The example in which the voltage periodic electric field drive signal is supplied to the voltage wiring VCOM at the time of electric field touch detection is described, but is not limited thereto. For example, instead of making the twelfth switch USW3 into the on state by the selection signal S30, the thirteenth switch USW4 and the fourteenth switch USW5 can be made into the on / off state complementarily by the selection signal S40. The drive electrode TL(0) is alternately connected to the voltage wirings TPH and TPL by the thirteenth switch USW4 and the fourteenth switch USW5 being made into the on / off state complementarily. As a result, a voltage that changes over time is supplied to the drive electrode TL(0), and an electric field that changes with time can be generated.

[0465] When magnetic field touch detection is performed, the magnetic field detection coil can be formed by the detection electrodes RL(0) to RL(p) or the scan lines GL(0) to GL(p) as in the case described in Embodiment Four. Also, when electric field touch detection is performed, for example, the scan line can be used as a detection electrode that detects a change in electric charge amount.

[0466] <Modification Example>

[0467] Figure 33 is a circuit diagram showing the configuration of the selection drive circuits SSU, SSD according to the modification example of Embodiment Five. Figure 33 is a schematic diagram, but is drawn in conformity with the actual configuration. Figure 33 is similar to Figure 32 , and thus, here, only the points of difference will be described.

[0468] In the configuration shown in Figure 32 , the voltage wirings TPL, TPH are disposed so as to surround the display panel 2. In contrast, in the modification example shown in Figure 33 , the voltage wirings TPL, TPH are disposed so as to surround the module 900( Figure 9A voltage wiring TPL is arranged in the area between edge 900-L of display panel 2 and edge 900-R of module 900, and a voltage wiring TPH is arranged in the area between edge 2-L of display panel 2 and edge 900-R of module 900. In other words, a voltage wiring TPH is arranged in the area between edge 2-L of display panel 2 and edge 900-R of module 900. Figure 9 In the area between edge 900-L of the display panel 2, no voltage wiring TPH is configured, and in the area between edge 2-R of the display panel 2 and module 900 ( Figure 9 In the area between the 900-R edges, no voltage wiring TPL is configured. That is, on the left and right edges, only one of voltage wiring TPH and TPL is configured.

[0469] In this modified example, voltage wiring TPL and TPH are also arranged in the region between edge 2-U of display panel 2 and edge 900-U of module 900, and voltage wiring TPL and TPH are also arranged in the region between edge 2-D of display panel 2 and edge 900-D of module 900. Furthermore, the voltage wiring TPL arranged in the region between edge 2-U and edge 900-U is connected to the voltage wiring TPL arranged in the region between edge 2-L and edge 900-L via the voltage wiring TPL arranged in the region between edge 2-D and edge 900-D. Moreover, the voltage wiring TPH arranged in the region between edge 2-U and edge 900-U is connected to the voltage wiring TPR arranged in the region between edge 2-D and edge 900-D via the voltage wiring TPR arranged in the region between edge 2-R and edge 900-R.

[0470] Therefore, while suppressing the increase in bezel size, it is possible to supply ground voltage Vss and a predetermined voltage to the selection drive circuit SSU arranged along edge 2-U of the display panel 2 and the selection drive circuit SSD arranged along edge 2-D of the display panel 2.

[0471] (Implementation Method Six)

[0472] Figure 34 This is a schematic top view showing the configuration of the display device 1 according to Embodiment Six. Although it is a schematic diagram, Figure 34 It is also described in conjunction with the actual configuration. In the display device 1 according to this embodiment six, similarly to embodiment five, the situation of generating a magnetic field during the magnetic field generation period TGT is also described using a drive electrode arranged parallel to the signal lines SL(0) to SL(p).

[0473] exist Figure 34 In, with Figure 31 Similarly, this indicates the portion involved in display panel 2. Figure 34 and Figure 31 Similarly, therefore, this section will mainly focus on explaining the differences.Figure 31 In this embodiment, by the selection drive circuit SSU including the drive circuit SU-R and the selection circuit SU-C, a predetermined voltage and the ground voltage Vss as a drive signal are supplied to the pair of drive electrodes during the magnetic field generation period TGT, thereby generating a magnetic field. Therefore, the voltage wiring TPL and the voltage wiring TPH are arranged along the edge 2-U of the display panel 2, and the ground voltage Vss and the predetermined voltage are supplied to the selection circuit SU-C.

[0474] In this embodiment six, the selection drive circuit SSU-S is also arranged along the edge 2-U of the display panel 2. The selection drive circuit SSU-S involved in this embodiment six includes the drive circuit SU-R and the selection connection circuit SU-S. The selection connection circuit SU-S is different from the selection circuit SU-C explained in the embodiment five, and connects between the signal wiring arranged in parallel with the signal lines SL(0) ~ SL(p) to form a magnetic field generation coil during the magnetic field generation period TGT. Here, as the signal wiring arranged in parallel with the signal lines SL(0) ~ SL(p), the voltage wiring arranged along the drive electrodes and the edges 2-L, 2-R of the display panel 2 is equivalent.

[0475] In the case of focusing on the voltage wiring TPH arranged between the edge 2-L of the display panel 2 and the edge 900-L of the module 900, and the voltage wiring TPL arranged between the edge 2-R of the display panel 2 and the edge 900-R of the module 900, in the embodiment five, the predetermined voltage and the ground voltage Vss are supplied to the selection circuit SU-C. In contrast to this, in this embodiment six, although not particularly limited, the voltage wiring TPL, TPH arranged along the edges 2-L, 2-R of the display panel 2 is also used as a winding of the magnetic field generation coil.

[0476] <Configuration of selection connection circuit>

[0477] Figure 35 is a circuit diagram showing the configuration of the selection drive circuit SSU-S involved in the embodiment six. Figure 35 is a schematic diagram, but is drawn in conformity with the actual arrangement. In Figure 35 , the selection drive circuit SSD and the drive electrodes TL(0) ~ TL(6) are the same as Figure 32 , and therefore the explanation is omitted.

[0478] The drive circuit SU-R is the same as Figure 32Likewise, a plurality of unit drive circuits USU(0) to USU(6) are included. The unit drive circuits USU(0) to USU(6) each include a shift section. The shift sections of the unit drive circuits USU(0) to USU(6) are connected in series, and selection information SEI set in the unit drive circuit USU(0) is moved toward the unit drive circuit USU(6) in synchronization with a clock signal not shown. The unit drive circuits USU(0) to USU(6) output selection signals S50 to S56 indicating selection by the selection information SEI indicating selection being set respectively. For example, in the unit drive circuit USU(3), if the selection information SEI indicating selection is supplied from the unit drive circuit USU(2) of the preceding section and moved, a selection signal S53 indicating selection is output.

[0479] The selection connection circuit SU-S includes fifteenth switches USW6(0) to USW6(6) corresponding to the unit drive circuits USU(0) to USU(6) respectively. The fifteenth switches USW6(0) to USW6(6) are connected between the drive electrodes TL(0) to TL(6), a voltage line TL(TPH) arranged along the edge 2-L of the display panel 2, and a voltage line TL(TPL) arranged along the edge 2-R of the display panel 2, in a manner in which one drive electrode is interposed therebetween. In the Figure 35 The voltage line TL(TPH) indicates a region in the voltage line TPH arranged along the edge 2-L of the display panel 2, and the voltage line TL(TPL) indicates a region in the voltage line TPL arranged along the edge 2-R of the display panel 2. The voltage lines TL(TPH) and TL(TPL) are arranged along the edges 2-L and 2-R of the display panel 2, and thus are parallel to the drive electrodes TL(0) to TL(6).

[0480] The fifteenth switch USW6(0) is connected between the voltage line TL (TPH) and one end of the drive electrode TL(1), is switched controlled by the selection signal S50 from the unit drive circuit USU(0), the fifteenth switch USW6(1) is connected between one end of the drive electrode TL(0) and the drive electrode TL(2) respectively, is switched controlled by the selection signal S51 from the unit drive circuit USU(1), the fifteenth switch USW6(2) is connected between one end of the drive electrode TL(1) and the drive electrode TL(3) respectively, is switched controlled by the selection signal S52 from the unit drive circuit USU(2). In addition, the fifteenth switch USW6(3) is connected between one end of the drive electrode TL(2) and the drive electrode TL(4) respectively, is switched controlled by the selection signal S53 from the unit drive circuit USU(3), the fifteenth switch USW6(4) is connected between one end of the drive electrode TL(3) and the drive electrode TL(5) respectively, is switched controlled by the selection signal S54 from the unit drive circuit USU(4).

[0481] Likewise, the fifteenth switch USW6(5) is connected between one end of the drive electrode TL(4) and the drive electrode TL(6) respectively, is switched controlled by the selection signal S55 from the unit drive circuit USU(5), the fifteenth switch USW6(6) is connected between one end of the drive electrode TL(5) and the voltage line TL (TPL), is switched controlled by the selection signal S56 from the unit drive circuit USU(6).

[0482] In this embodiment six, in the magnetic field generation period TGT, when the unit drive circuit USU(0) outputs the selection signal S50 indicating selection, the unit drive circuit USD(1) outputs the selection signal S41 which makes the thirteenth switch USW4 in the unit selection circuit UDC(1) to be in the on state, and makes the fourteenth switch USW5 to be in the off state. By the selection signal S50, the fifteenth switch USW6(0) is in the on state, therefore the voltage line TL (TPH) and the drive electrode TL(1) arranged in parallel with each other are connected in series. As a result, the magnetic field generation coil is formed which makes the voltage line TL (TPH) and the drive electrode TL(1) to be windings. Magnetic fields are respectively generated in the voltage line TL (TPH) and the drive electrode TL(1) by the current flowing through the voltage line TL (TPH) and the drive electrode TL(1) connected in series. In the region of the drive electrode TL(0) sandwiched between the voltage line TL (TPH) and the drive electrode TL(1), the generated magnetic fields are overlapped, and a strong magnetic field is generated.

[0483] Next, if the selection information SEI indicating the selection moves to the unit drive circuit USU(1), the fifteenth switch USW6(1) becomes the on state by the selection signal S51. At this time, the unit drive circuit USD(0) outputs the selection signal S40 which makes the fourteenth switch USW5 in the unit selection circuit UDC(0) become the on state and makes the thirteenth switch USW4 become the off state. In addition, the unit selection circuit UDC(2) outputs the selection signal S42 which makes the thirteenth switch USW4 in the unit selection circuit UDC(2) become the on state and makes the fourteenth switch USW5 become the off state. The fifteenth switch USW6(1) becomes the on state, so the drive electrodes TL(0) and TL(2) arranged in parallel with each other are connected in series, forming a magnetic field generating coil which makes these drive electrodes become windings. In addition, since a current flows through the drive electrodes TL(0), TL(2) connected in series, a magnetic field is generated, and the generated magnetic field is superimposed in the region of the drive electrode TL(1).

[0484] After that, similarly, in turn, the fifteenth switch becomes the on state, the two drive electrodes are connected in series between them, and a current flows through the drive electrodes connected in series, thereby generating a strong magnetic field. In addition, when the fifteenth switch USW6(6) becomes the on state by the selection signal S56 from the unit drive circuit USU(6), a magnetic field generating coil which makes the drive electrode TL(5) and the voltage wiring TL(TPL) become windings is formed. In this case, a strong magnetic field is generated in the region of the drive electrode TL(6).

[0485] In Figure 35 the above, a case in which one drive electrode is interposed has been described, but it is not limited thereto. For example, two or more drive electrodes can be interposed, and a drive electrode can not be interposed. For example, in the case in which two drive electrodes are interposed, the fifteenth switch USW6(0) is connected between the voltage wiring TL(TPH) and the drive electrode TL(2), and the fifteenth switch USW6(1) is connected between the drive electrode TL(0) and the drive electrode TL(3). On the other hand, in the case in which no electrode is interposed, the fifteenth switch USW6(0) is connected between the voltage wiring TL(TPH) and the drive electrode TL(0), and the fifteenth switch USW6(1) is connected between the drive electrode TL(0) and the drive electrode TL(1).

[0486] The magnetic field detection coil and the electric field detection electrode can be the same as in Embodiment Five. In addition, the electric field touch detection can be implemented similarly to Embodiment Five.

[0487] In this sixth embodiment, voltage wiring TL(TPH) and TL(TPL) arranged along the edge of the display panel 2 on the outside of the display panel 2 are also used as windings for the magnetic field generating coil. Therefore, pen touch can be detected even in the portion of the display panel 2 near edges 2-L and 2-R. Of course, only one voltage wiring can be used as the winding for the magnetic field generating coil, or both voltage wiring TL(TPH) and TL(TPL) can be used as windings for the magnetic field generating coil. Furthermore, in Figure 35 The example given is a magnetic field generating coil with a single winding, but the magnetic field generating coil can also be a winding with 1.5 or more windings.

[0488] In this specification, the drive wiring that generates the magnetic field during the magnetic field generation period (TGT), such as a drive electrode, signal line, or scan line, has a pair of ends. The other end (or one end) of this pair of ends is located opposite the other end (or the other end) in the extension direction of the drive wiring. During magnetic field generation, a drive signal is supplied to one end (or the other end), and a ground voltage Vss, serving as a reference signal, is supplied to the other end (or the other end). If the one end and the other end are considered as a first region and a second region of the drive wiring, it can be understood that during the magnetic field generation period (TGT), a drive signal is supplied to the first region (or the second region), and a reference signal is supplied to the second region (or the first region).

[0489] If we take implementation method one... Figure 8 For example, during the magnetic field generation period TGT, the driving wiring that generates the magnetic field consists of driving electrodes TL(0) to TL(p) extending in the row direction, and a first region (second region) exists in the direction in which the second region (first region) extends in the row direction. Alternatively, if multiple driving electrodes TL(0) to TL(p) are considered as multiple driving wirings, during the magnetic field generation period TGT, one of the driving electrodes selected by the selection signal from the unit driving circuit can be considered as the first driving wiring, and the other driving electrode as the second driving wiring. In this case, the ends (e.g., the first regions) of each of the first and second driving wirings are located on the same side (e.g., side 2-L) of the display panel 2, and the ends (second regions) of the other side are located on the same side (side 2-R) of the display panel 2. Therefore, the first regions (ends of one side) of each of the first and second driving wirings are close to each other, and the second regions (ends of the other side) of each of the first and second driving wirings are close to each other.

[0490] Additionally, during the magnetic field generation period in the TGT, more than one drive wire is sandwiched between the selected pair of drive wires (in...Figure 8 In the case where the drive electrodes TL(0) to TL(p) are regarded as the drive lines, the signal lines SL(0) to SL(p) extending in the column direction in a manner crossing the drive electrodes TL(0) to TL(p) can be regarded as the detection lines. Of course, the detection lines are not limited to the signal lines SL(0) to SL(p), and can be the scan lines GL(0) to GL(p) or the detection electrodes RL(0) to RL(p). Figure 8 In the case where the drive electrodes TL(0) to TL(p) are regarded as the drive lines, the signal lines SL(0) to SL(p) extending in the column direction in a manner crossing the drive electrodes TL(0) to TL(p) can be regarded as the detection lines. Of course, the detection lines are not limited to the signal lines SL(0) to SL(p), and can be the scan lines GL(0) to GL(p) or the detection electrodes RL(0) to RL(p).

[0491] Those skilled in the art will appreciate that various modifications and changes can be made within the scope of the present application, and it is understood that such modifications and changes are to be included within the scope of the present application.

[0492] For example, the modes obtained by appropriately adding, deleting, or changing the design of the components of each of the above-described embodiments by those skilled in the art, or the modes obtained by adding, omitting, or changing the conditions of the processes, as long as the modes include the gist of the present application, are included in the scope of the present application.

[0493] For example, in the embodiments, the case where the common electrodes TL(0) to TL(p) and the signal lines SL(0) to SL(p) extend in the column direction and are arranged in the row direction is described, but the row direction and the column direction vary depending on the viewing angle. The case where the common electrodes TL(0) to TL(p) and the signal lines SL(0) to SL(p) extend in the row direction and are arranged in the column direction is also included in the scope of the present application by changing the viewing angle. In addition, "parallel" used in the present specification means extending without intersecting from one end to the other end. Therefore, even if one of the lines is set in a state where a part or the entire line is inclined with respect to the other line, as long as the lines do not cross from one end to the other end, the state is regarded as "parallel" in the present specification. In addition, in the present specification, "crossing" means intersecting from one end to the other end. Figure 18 In the present embodiment, an example in which, when electric field touch detection is performed, the drive electrodes other than the drive electrode generating the electric field are connected to the voltage line VCOM is described, but the present application is not limited thereto, and the drive electrodes other than the drive electrode generating the electric field can be in a floating state.

[0494] Explanation of Reference Numerals

[0495] 1: display device with touch function; 2: display panel; 3: signal line selector; 4: display control device; 5: gate driver; 6: touch control device; RL(0)~RL(p): detection electrode; TL(0)~TL(p): driving electrode; GL(0)~GL(p): scan line; SL(0)~SL(p): signal line; SSL, SSR, SSU, SSD, SSU-S: selection driving circuit; SL-R, SR-R, SU-R, SD-R: driving circuit; SL-C, SR-C, SU-C, SD-C: selection circuit; SU-S: selection connection circuit; SDC: selection driving circuit; USL(0)~USL(p), USR(0)~USR(p), USU(0)~USU(p), USD(0)~USD(p): unit driving circuit; TPL, TPH, VCOM: voltage wiring; TSV: signal wiring.

Claims

1. A device for detecting the position of an object, wherein, include: Multiple driving electrodes, each extending in a first direction, are arranged in a second direction intersecting the first direction in a detection region for detecting externally approaching objects; Multiple detection electrodes, each extending in a second direction, are arranged in the first direction within the detection region; The first driving wiring is oriented towards one end of the plurality of driving electrodes; The first reference wiring is opposite to the other end of the plurality of driving electrodes; as well as Switch control circuit, When the switch control circuit detects the external proximity of the object, Under the first timing condition, one end of the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring. In the second timing immediately following the first timing, one end of the (n+2)th second driving electrode adjacent to the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring, where n is a natural number.

2. The apparatus according to claim 1, wherein, For a continuously arranged drive electrode, current is supplied in the same direction by shifting it one by one at a first timing and a second timing.

3. The apparatus according to claim 2, wherein, The driving electrode driven under the second timing condition will not be driven under the first timing condition.

4. The apparatus according to claim 1, wherein, The first drive wiring and the first reference wiring extend in the second direction.

5. The apparatus according to claim 1, wherein, Also includes: A second drive wiring that supplies the drive signal is different from the first drive wiring; and A second reference wiring that supplies the reference signal is different from the first reference wiring.

6. The apparatus according to claim 5, wherein, When the switch control circuit detects the external proximity of the object, Under the first timing, the other end of the (n+k)th second driving electrode is connected to the second driving wiring, and the first end is connected to the second reference wiring. In the second timing immediately following the first timing, the other end of the (n+k+1)th second driving wiring adjacent to the (n+k)th second driving electrode is connected to the second driving wiring, and the first end is connected to the second reference wiring, where k is a natural number greater than or equal to 1.

7. An integrated circuit used by a device for detecting the position of an object, wherein, The device includes: Multiple driving electrodes, each extending in a first direction, are arranged in a second direction intersecting the first direction in a detection region for detecting externally approaching objects; Multiple detection electrodes, each extending in a second direction, are arranged in the first direction within the detection region; A first driving wiring is oriented toward one end of the plurality of driving electrodes; and The first reference wiring is aligned with the other end of the plurality of driving electrodes. When the integrated circuit detects the external proximity of the object, Under the first timing condition, one end of the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring. In the second timing immediately following the first timing, one end of the (n+2)th second driving wiring adjacent to the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring, where n is a natural number.

8. A method using an integrated circuit, wherein the method is used by an integrated circuit in a device for detecting the position of an object, wherein, The device includes: Multiple driving electrodes, each extending in a first direction, are arranged in a second direction intersecting the first direction in a detection region for detecting externally approaching objects; Multiple detection electrodes, each extending in a second direction, are arranged in the first direction within the detection region; A first driving wiring is oriented toward one end of the plurality of driving electrodes; and The first reference wiring is aligned with the other end of the plurality of driving electrodes. When detecting the external proximity of the object. Under the first timing condition, one end of the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring. In the second timing immediately following the first timing, one end of the (n+2)th second driving wiring adjacent to the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring, where n is a natural number.

9. A device for detecting the position of an object, comprising: Multiple driving electrodes, each extending in a first direction, are arranged in a detection region for detecting external objects approaching in a second direction intersecting the first direction; Multiple detection electrodes, each extending in the second direction and arranged in the detection region in the first direction; A first driving wiring extends in the second direction and faces one end of the plurality of driving electrodes; A second driving wiring extends in the second direction and faces the other end of the plurality of driving electrodes; A first reference wiring extends in the second direction and faces the other end of the plurality of driving electrodes; as well as A second reference wiring extends in the second direction and faces one end of the plurality of driving electrodes. When the external proximity of the object is detected. Under the first timing condition, one end of the (n+1)th first driving electrode is connected to the first driving wiring and the other end is connected to the first reference wiring. Under the second timing, one end of the (n+2)th second driving wiring adjacent to the (n+1)th first driving electrode is connected to the first driving wiring and the other end is connected to the first reference wiring.

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