Display device

Abstract

A display device with a touch detection function that can be manufactured while suppressing price increases. The display device includes: a pixel array; a plurality of drive electrodes; a plurality of detection electrodes; first and second drive wiring lines, each facing one end and the other end of the plurality of drive electrodes and supplying an AC voltage thereto; first and second reference voltage wiring lines, each facing one end and the other end of the plurality of drive electrodes and supplying a first reference voltage thereto, wherein the first reference voltage wiring line is farther from the one end of the plurality of drive electrodes than the first drive wiring line, and the second reference voltage wiring line is farther from the other end of the plurality of drive electrodes than the second drive wiring line; a plurality of first switch circuits, each coupling one end of the drive electrodes to one of the first drive wiring line and the first reference voltage wiring line; and a plurality of second switch circuits, each coupling the other end of the drive electrodes to one of the second drive wiring line and the second reference voltage wiring line.

Description

[0001] This application is a divisional application of a patent application filed on March 9, 2017, with application number 201710140517.4 and invention name “Display Device”, all contents of which are incorporated herein by reference. Technical Field

[0002] The present invention relates to a display device, and in particular to a display device with a touch detection function capable of detecting an external approaching object. Background Art

[0003] In recent years, touch detection devices, called touch panels, that can detect external objects approaching have attracted attention. Touch panels are often combined with display devices, such as mounted on liquid crystal display devices or integrated with liquid crystal display devices, to provide display devices with touch detection capabilities.

[0004] There are touch panels that can be used as an external proximity object, such as a pen. The ability to use a pen allows for input such as specifying a small area or handwriting. Various technologies exist for detecting touches using a pen. One such technology is electromagnetic induction. Electromagnetic induction can achieve high precision and high pen pressure detection accuracy, and can also detect hovering after an external proximity object has left the touch panel surface. Therefore, electromagnetic induction is a leading technology for detecting touches using a pen.

[0005] In addition, there are touch panels that can be used as external proximity objects. By being able to use fingers, there is no need to prepare a pen, etc., which makes it simple. For example, various button images are displayed on a display device with a touch detection function, and the touch panel detects that a finger is approaching the button image. In this way, the touch panel can be used as a substitute for conventional mechanical buttons. Since such a display device with a touch detection function does not necessarily require an information input unit such as a keyboard or mouse, there is a trend of expanding its use in portable information terminals such as mobile phones in addition to computers.

[0006] There are various technologies for detecting finger touches. For example, there are optical, resistive, and capacitive methods. Capacitive methods are used in portable information terminals and other applications due to their relatively simple structure and low power consumption.

[0007] Although a touch panel that can be used with a finger is convenient, it is not easy to designate a small area with a finger, for example. Therefore, a touch panel that can be used with both a pen and a finger is desired.

[0008] For example, Patent Documents 1 to 3 describe touch detection technologies using electromagnetic induction.

[0009] Prior art literature

[0010] Patent Literature

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

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

[0013] Patent Document 3: Japanese Patent Application Laid-Open No. 2006-163745. Summary of the Invention

[0014] A display device includes: a pixel arrangement having a plurality of pixels arranged in a matrix; a plurality of drive wirings, which are arranged in the pixel arrangement to extend in a first direction respectively; and a plurality of detection wirings, which are arranged in the pixel arrangement to extend in a second direction intersecting the first direction. When detecting an external approaching object, a magnetic field drive signal that periodically changes is supplied to a first area in a first drive wiring among the plurality of drive wirings, and a reference signal is supplied to a second area extending in the first direction relative to the first area, thereby generating a magnetic field corresponding to the magnetic field drive signal in the first drive wiring. Based on the magnetic field generated in the first drive wiring, the magnetic field generated by the external approaching object is detected by the plurality of detection wirings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an explanatory diagram showing the relationship between an electronic device having a display device with a touch detection function and a pen.

[0016] Figure 2 (A) and (B) are explanatory diagrams showing the principle of the electromagnetic induction method.

[0017] Figure 3 (A) and (B) are waveform diagrams showing the principle of the electromagnetic induction method.

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

[0019] Figure 5 (A) to (C) are explanatory diagrams showing the principle of the electrostatic capacitance method.

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

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

[0022] Figure 8This is a block diagram showing the configuration of a display device according to the first embodiment.

[0023] Figure 9 It is a plan view showing the configuration of a module of the display device according to the first embodiment.

[0024] Figure 10 It is a plan view showing the structure of a display panel of the display device according to the first embodiment.

[0025] Figure 11 It is a cross-sectional view showing the structure of the display device according to the first embodiment.

[0026] Figure 12 This is a circuit diagram showing a circuit configuration of a display panel of a display device according to the first embodiment.

[0027] Figure 13 (A) and (B) are explanatory diagrams showing a touch detection operation of the display device according to the first embodiment.

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

[0029] Figure 15 (A) to (C) are waveform diagrams showing waveforms during the magnetic field generation period of the display device according to the first embodiment.

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

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

[0032] Figure 18 1 is a schematic plan view illustrating an electric field touch detection operation of the display device according to the first embodiment.

[0033] Figure 19 It is a plan view schematically showing the configuration of the display device according to the first embodiment.

[0034] Figure 20 It is a perspective view schematically showing the configuration of the display device according to the first embodiment.

[0035] Figure 21 It is a perspective view schematically showing the configuration of a display device according to a modification of the first embodiment.

[0036] Figure 22 It is a plan view showing the configuration of a display device according to the second embodiment.

[0037] Figure 23 It is a plan view showing the operation of the display device according to the second embodiment.

[0038] Figure 24 It is a plan view showing the operation of the display device according to the second embodiment.

[0039] Figure 25 (A) to (I) are timing charts showing the operation of the display device according to the third embodiment.

[0040] Figure 26 (A) to (F) are timing charts showing the operation of the display device according to the third embodiment.

[0041] Figure 27 This is a circuit diagram showing the configuration of a detection circuit of a display device according to a third embodiment.

[0042] Figure 28 It is a plan view showing the structure of a display device according to a fourth embodiment.

[0043] Figure 29 This is a circuit diagram illustrating the principle of touch detection in the display device according to the fourth embodiment.

[0044] Figure 30 It is a plan view showing the configuration of a display device according to a modified example of the fourth embodiment.

[0045] Figure 31 It is a schematic plan view showing the configuration of a display device according to the fifth embodiment.

[0046] Figure 32 This is a circuit diagram showing the configuration of a selection drive circuit in a display device according to a fifth embodiment.

[0047] Figure 33 This is a circuit diagram showing the configuration of a selection drive circuit in a display device according to a modification of the fifth embodiment.

[0048] Figure 34 It is a schematic plan view showing the configuration of a display device according to a sixth embodiment.

[0049] Figure 35 This is a circuit diagram showing the configuration of a selective connection circuit in a display device according to a sixth embodiment.

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

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

[0052] Figure 38 It is a plan view showing the configuration of a display device according to a modified example of the fourth embodiment.

[0053] Figure 39 It is a plan view showing the configuration of a display device according to a modified example of the fourth embodiment.

[0054] Figure 40 It is a plan view showing the configuration of a display device according to a modified example of the fourth embodiment. DETAILED DESCRIPTION

[0055] The following describes various embodiments of the present invention with reference to the accompanying drawings. It should be noted that the disclosure is ultimately merely an example, and appropriate modifications within the scope of the invention that are readily conceivable to a person skilled in the art are naturally within the scope of the present invention. Furthermore, in order to clarify the description, the drawings sometimes schematically illustrate the width, thickness, shape, etc. of various parts compared to actual embodiments. These are merely examples and are not intended to limit the interpretation of the present invention.

[0056] In addition, in this specification and each figure, the same reference numerals are given to the same parts as those described in the drawings that have already appeared, and their detailed description may be appropriately omitted.

[0057] In the following description, a liquid crystal display device with a touch detection function is used as an example of a display device with a touch detection function. However, this is not limited to this 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. With the latter method, it is also possible to install a battery in the pen, thereby increasing the miniaturization and / or shape freedom of the pen.

[0058] One electromagnetic induction method involves installing a coil and a battery in a pen to generate a magnetic field, and then detecting the magnetic field energy in a touch panel. In this case, a sensor plate is required in the touch panel to receive the magnetic field energy. Alternatively, a coil and a capacitor are installed in the pen to generate a magnetic field in the touch panel, and the capacitor in the pen accumulates the magnetic field energy, which is then detected by the touch panel. In this method, a sensor plate is required in the touch panel to generate the magnetic field and receive the magnetic field energy from the pen.

[0059] Regardless of which electromagnetic induction method is used, in order to realize a display device with a touch detection function, it is necessary to add a sensor board that receives electromagnetic energy, and the price (production cost) increases.

[0060] Furthermore, the electrostatic capacitance method for detecting touches with a finger also requires a sensor plate to detect changes in capacitance. Therefore, implementing a display device with a touch detection function requires additional sensor plates, which increases the price.

[0061] To detect both pen touch and finger touch, separate sensor plates are required, further increasing the price. For example, one approach could be to combine a portion of the sensor plate used for electromagnetic induction with a portion of the sensor plate used for electrostatic capacitance, thereby suppressing price increases. However, combining these two components requires control for switching between the two, making the control more complex. Furthermore, the number of control circuits required increases, becoming a limitation in suppressing price increases.

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

[0063] A display device according to one embodiment of the present invention includes: a pixel arrangement having a plurality of pixels arranged in a matrix; a plurality of drive wirings, in the pixel arrangement, configured to extend in a first direction respectively; and a plurality of detection wirings, in the pixel arrangement, configured to extend in a second direction intersecting the first direction. Here, when detecting an external approaching object, a first drive wiring among the plurality of drive wirings supplies a periodically changing magnetic field drive signal to a first region and supplies a reference signal to a second region extending in the first direction relative to the first region. Thus, 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 is close to the first drive wiring. The magnetic field generated by the external approaching object is detected by the plurality of detection wirings.

[0064] To generate a magnetic field, it is considered possible to electrically connect, for example, two drive wirings extending in a first direction to form a coil. In this case, it is necessary to control the connection between the two drive wirings. In contrast, in a display device according to one embodiment, it is not necessary to control the connection between the drive wirings, making control easier. In addition, the increase in control circuitry can be suppressed. As a result, it is possible to suppress price increases for display devices with touch detection functions.

[0065] Furthermore, in a display device according to one embodiment of the present invention, the plurality of drive wirings includes a second drive wiring arranged proximate to a first drive wiring, and the second drive wiring includes a first region proximate to the first region and a second region proximate to the second region. When detecting an external approaching object, a reference signal is supplied to the first region of the second drive wiring, and a magnetic field drive signal is supplied to the second region of the second drive wiring. In this case, the magnetic field generated by the first drive wiring and the magnetic field generated by the second drive wiring overlap in the region between the first and second drive wirings. This can enhance the generated magnetic field.

[0066] Moreover, a display device according to one embodiment of the present invention includes a plurality of drive wirings arranged parallel to each other between the first and second sides in a display area having a first side and a second side opposite to each other, and is a display device that detects an external object approaching the display area. The display device includes a first drive circuit connected to the end of each of the plurality of drive wirings on one side, and a second drive circuit connected to the end of each of the plurality of drive wirings on the other side. Here, the first drive circuit supplies a magnetic field drive signal to the end of one side of the first drive wiring arranged close to the first side, and the second drive circuit supplies a reference signal to the end of the other side of the first drive wiring. At this time, the first drive circuit supplies a reference signal to the end of one side of the second drive wiring arranged closer to the second side than the first drive wiring and arranged with a third drive wiring between the first drive wiring and the first drive wiring, and the second drive circuit supplies a magnetic field drive signal to the end of the other side of the second drive wiring.

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

[0068] A magnetic field drive signal and a reference signal are supplied to a drive wiring selected from a plurality of drive wirings by a first drive circuit and a second drive circuit in such a manner that drive wirings corresponding to the first drive wiring and the second drive wiring, respectively, are moved from a first side to a second side, thereby detecting an external object approaching the display area during a display period of one frame in the display area.

[0069] This makes it possible to detect an external object approaching the display area while preventing control from becoming complicated.

[0070] (Implementation Method 1)

[0071] The liquid crystal display device with a touch detection function (hereinafter referred to as the display device) according to the first embodiment has both electromagnetic induction and electrostatic capacitance touch detection functions. Specifically, it can detect touches using a pen and touches using a finger. First, the principles of electromagnetic induction and electrostatic capacitance are explained.

[0072] <Basic Principle of Electromagnetic Induction>

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

[0074] exist Figure 1 In the example shown in the figure, the electronic device has a display device 1 housed in a metal cover, a light guide plate, a sensor plate, and a magnetic sheet. In the example shown in the figure, the sensor plate is installed between the display device 1 and the metal cover. The sensor plate is provided with a plurality of coils, but Figure 1 In the figure, one of the coils is schematically represented as the sensor board coil (hereinafter also referred to as coil) L2.

[0075] In addition, the pen, which is equivalent to the external proximity object, has a built-in coil and capacitor element. Figure 1 In FIG, the capacitive element is omitted, but the coil built into the pen is schematically shown as the internal pen coil (hereinafter also simply referred to as the coil) L1. The coil L1 and the coil L2 are coupled by a magnetic field.

[0076] It should be noted that, regarding the display device 1, in order to schematically show its structure, Figure 1 The TFT glass substrate, color filter, and CF glass substrate included in display device 1 are depicted in FIG. The TFT glass substrate, although not shown, is formed with multiple layers. A color filter is formed on the CF glass substrate, and a liquid crystal layer (not shown) is interposed between the color filter and the TFT glass substrate. Furthermore, the light guide plate is secured by a fixing portion so as to be sandwiched between display device 1 and the sensor panel.

[0077] When the pen approaches (including touches) the electronic device, the coil L1 approaches the coil L2, thereby generating magnetic field coupling between the coil L1 and the coil L2, and detecting the approach of the pen.

[0078] use Figure 2 and Figure 3 This test will be described. Figure 2 (A) indicates the state where coil L2 generates a magnetic field. Figure 2(B) shows the state where the coil L1 generates a magnetic field.

[0079] exist Figure 2 In the example, coil L1 within the pen is connected in parallel to a capacitive element (hereinafter referred to as the capacitive element) C within the pen, forming a resonant circuit. Coil L2 within the sensor plate is shown as an example of a primary winding coil and has a pair of terminals. When detecting a touch with a pen (during touch detection), terminal PT of coil L2 is connected to the output of transmitting amplifier AP1 for a predetermined time. After the predetermined time, it is connected to the input of receiving amplifier AP2 for a predetermined time. Furthermore, during touch detection, the other terminal of coil L2 within the sensor plate is connected to ground voltage Vss.

[0080] Figure 3 This is a waveform diagram showing the action during touch detection. Figure 3 The horizontal axis represents time, Figure 3 (A) represents the waveform of the output of the transmitting amplifier AP1, Figure 3 (B) shows the waveform of the output of the receiving amplifier AP2.

[0081] When the terminal PT of the coil L2 is connected to the output of the transmission amplifier AP1, a periodically changing transmission signal IN is supplied to the input of the transmission amplifier AP1. Figure 3 As shown in (A), a periodically changing drive signal is supplied to one terminal of the coil L2 for a predetermined time (magnetic field generation period) TGT. Thus, the coil L2 generates a magnetic field. Figure 2 In (A), the magnetic lines of force at this time are expressed as

[0082] magnetic lines of force Since the magnetic field is generated around the winding of coil L2, the magnetic field inside coil L2 becomes stronger. Figure 2 As shown in (A), the central axis LO of coil L1 is inside coil L2, and the magnetic field lines of coil L2 reach coil L1. That is, coil L1 is placed in the magnetic field generated by coil L2, and coils L1 and L2 are coupled by the magnetic field. Coil L2 is driven by the drive signal The changes in the current L2 and L1 generate a periodically changing magnetic field. Therefore, due to the mutual induction between coil L2 and coil L1, an induced voltage is generated in coil L1. The induced voltage generated by coil L1 charges capacitor C.

[0083] After a predetermined time, the terminal PT of the coil L2 is connected to the input of the receiving amplifier AP2 for a predetermined time (magnetic field detection period or current detection period) TDT. During the magnetic field detection period TDT, if the capacitor C is charged during the previous magnetic field generation period TGT, the coil L1 generates a magnetic field by the charge charged in the capacitor C. Figure 2 In (B), the magnetic lines of force of the coil L1 generated by the charge stored in the capacitor element C are expressed as

[0084] During touch detection, that is, during the magnetic field generation period TGT and the magnetic field detection period TDT, if the pen coil L1 approaches the sensor plate coil L2, the capacitor C is charged during the magnetic field generation period TGT, and the magnetic field lines of the coil L1 are The magnetic field generated by coil L1 changes according to the time constant of the resonant circuit. The change in the magnetic field generated by coil L1 generates an induced voltage in coil L2. This induced voltage causes a signal change at one terminal PT of coil L2. This signal change is used as a detection signal. During the magnetic field detection period TDT, the signal is input to the receiving amplifier AP2 and amplified, and then output from the receiving amplifier AP2 as the sensor signal OUT.

[0085] On the other hand, during touch detection, if the pen coil L1 approaches the sensor plate coil L2, the capacitive element C is not charged during the magnetic field generation period TGT, or the amount of charge is reduced. As a result, during the magnetic field detection period TDT, the magnetic field lines generated by the coil L1 are Therefore, during the magnetic field detection period TDT, the detection signal at one terminal PT of the coil L2 No change.

[0086] exist Figure 3 In FIG, two states are shown: when the pen coil L1 is close to the sensor plate coil L2 and when it is not close to the sensor plate coil L2. Figure 3 In the figure, the left side shows the state when coil L1 is not close to coil L2, and the right side shows the state when coil L1 is close to coil L2. Figure 3 In (B), during the magnetic field detection period TDT shown on the left, the detection signal No change, in the magnetic field detection period TDT shown on the right, the detection signal By changing the detection signal The change is judged as a pen, and the detection signal If there is no change, it is determined that there is no pen, and touch with a pen can be detected.

[0087] exist Figure 3 In the figure, it indicates whether there is a pen or not. However, due to the distance between coil L1 and coil L2, the detection signal The value of can also be used to determine the distance between the pen and the sensor plate or the pen pressure.

[0088] <Basic Principle of Capacitive Method>

[0089] Next, the basic principle of the electrostatic capacitance method is explained. Figure 1 The following describes an example of detecting a touch by a finger using a signal wiring formed in the display device 1 shown in FIG. That is, the following describes a case where a capacitance sensor panel is integrated with a display device. Figure 1 The configuration of the display device 1 shown will be described in more detail. Figure 4 Schematically shows the structure of the display device 1. Figure 4 (A) is a top view schematically showing the plane of the display device 1. Figure 4 (B) is a cross-sectional view schematically showing a cross section of the display device 1 .

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

[0091] The CF glass substrate CGB also includes a first main surface CSF1 and a second main surface CSF2 ( Figure 4 (B)). Figure 4 In FIG, only the layers forming the detection electrodes RL(0) to RL(p) arranged on the first main surface CSF1 are depicted. Figure 4 In (A), the TFT glass substrate TGB and the CF glass substrate CGB are separated. Specifically, Figure 4As shown in FIG. 1 (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 arranged to face each other with a liquid crystal layer (layer) interposed therebetween.

[0092] Between the first main surface TSF1 of the TFT glass substrate TGB and the second main surface CSF2 of the CF glass substrate CGB, there are a plurality of layers and a liquid crystal layer. Figure 4 In FIG, only the driving electrodes TL(0) to TL(n+2), the liquid crystal layer, and the color filter are separated between the first main surface TSF1 and the second main surface CSF2. Figure 4 As shown in (A), a plurality of detection electrodes RL(0) to RL(p) and polarizing plates are arranged. Figure 4 In (B), 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 this manual, if Figure 4 As shown in (B), the display device 1 will be described as being viewed from the side of the first main surfaces CSF1 and TSF1 of the CF glass substrate CGB and the TFT glass substrate TGB as viewed from above. That is, the view from above is the state when viewed from the side of the first main surfaces CSF1 and TSF1 of the CF glass substrate CGB and the TFT glass substrate TGB. Therefore, although it is described that the detection electrode and the polarizing plate are arranged on the side of the first main surface CSF1 of the CF glass substrate CGB, if the direction of observation is changed, for example, the detection electrode and the polarizing plate are arranged on the right side, left side or bottom side of the CF glass substrate CGB. Figure 4 In (B), 13 denotes an amplifier circuit connected to the detection electrode RL(n).

[0094] When viewed from the first main surface CSF1 and TSF1, Figure 4 As shown in (A), on the first main surface TSF1 of the TFT glass substrate TGB, the driving electrodes TL(0) to TL(p) extend in the row direction (horizontal direction) and are arranged in parallel in the column direction (vertical direction). Figure 4 As shown in FIG. 2(A), on the first main surface CSF1 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] like Figure 4As shown in (B), the CF glass substrate CGB, the liquid crystal layer, etc. 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 from above, but are electrically separated from each other. Since there is capacitance between the driving electrodes and the detection electrodes, Figure 4 In (B), the capacitance is shown as a capacitance element by a dotted line. It should be noted that the driving electrodes TL(0) to TL(p) are separated from each other, and the detection electrodes RL(0) to RL(p) are also separated from each other.

[0096] The driving electrodes TL( 0 ) to TL(p) are supplied with a driving signal for display (display driving signal) when display is performed, and are supplied with a driving signal for touch detection when a touch is detected using a finger.

[0097] In the first embodiment, the electric field is used to detect the touch by the finger, and the magnetic field is used (see Figure 1 、 Figure 2 and Figure 3 ) is used to detect touch using a pen. Therefore, in this specification, the detection of touch using a magnetic field is referred to as magnetic field touch detection, and the detection of touch using an electric field is referred to as electric field touch detection. As will be explained later, for the driving electrodes TL(0) to TL(p), a driving signal for touch detection is also supplied during magnetic field touch detection. Therefore, when displaying, electric field touch detection, and magnetic field touch detection are performed, corresponding driving signals are supplied to the driving electrodes TL(0) to TL(p), respectively. That is, when displaying, electric field touch detection, and magnetic field touch detection are performed, the driving electrodes TL(0) to TL(p) are used in common (used in combination). When viewed from the perspective of being used in common, the driving electrodes TL(0) to TL(p) can be regarded as common electrodes, respectively.

[0098] During the electric field touch detection period, the driving electrodes TL(0) to TL(p) are supplied with a driving signal Tx for the electric field. To the driving electrodes selected in a manner to detect a touch, a signal whose voltage periodically changes is supplied as the driving signal Tx, and to the driving electrodes that are not selected in a manner not to detect a touch, a predetermined fixed voltage, for example, is supplied as the driving signal Tx. During the electric field touch detection period, the driving electrodes TL(0) to TL(p) are sequentially selected, for example, in this order. Figure 4 (A) shows a state in which a signal whose voltage periodically changes is supplied to the driving electrode TL(2) as the driving signal Tx(2). For example, the driving electrodes are selected in sequence from the driving electrode TL(0) toward TL(p), and a driving signal whose voltage periodically changes is supplied.

[0099] In contrast, during the display period, 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, use Figure 5 , the basic principle of the electrostatic capacitance method is explained. Figure 5 In the equation, TL(0)~TL(p) are Figure 4 The driving electrodes RL(0) to RL(p) are shown in FIG. Figure 4 The detection electrodes are shown. Figure 5 In (A), the driving electrodes TL(0) to TL(p) extend in the row direction and are arranged in parallel in the column direction. In addition, the detection electrodes RL(0) to RL(p) extend in the column direction in a manner intersecting with the driving electrodes TL(0) to TL(p) and are arranged in parallel in the row direction. Figure 4 As shown in (B), a liquid crystal layer is arranged between the detection electrodes RL(0)~R(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] exist Figure 5 In (A), 12-0 to 12-p schematically represent unit drive electrode drivers. In this figure, drive signals Tx(0) to Tx(p) are output from unit drive electrode drivers 12-0 to 12-p. In addition, 13-0 to 13-p schematically represent unit amplifier circuits. Figure 5 In (A), the pulse signal enclosed by a solid circle represents the waveform of the drive signal Tx supplied to the selected drive electrode. In this figure, a finger is shown as FG as an external proximity object.

[0102] exist Figure 5 In the example of (A), the unit driving electrode driver 12-2 supplies a pulse signal 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), Figure 5 As shown in (B), 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) close to 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) decreases. As a result, the amount of charge between the driving electrode TL(2) and the detection electrode RL(n) decreases. As a result, Figure 5As shown in (C), the amount of charge generated in response to the supply of the drive signal Tx(2) decreases by ΔQ when the finger FG is touching compared to when it is not touching. The difference in charge amount is represented as a voltage difference in the detection signal Rx(n), which is supplied to the unit amplifier circuit 13-n and amplified.

[0103] It should be noted that in Figure 5 In (C), the horizontal axis represents time and the vertical axis represents the amount of charge. In response to the rising edge of the driving signal Tx(2), the amount of charge increases (increases toward the upper side in the figure), and in response to the falling edge of the voltage of the driving signal Tx(2), the amount of charge increases (increases toward the lower side in the figure). At this time, the amount of charge increased varies depending on whether there is a touch of the finger FG. In addition, in this figure, after the amount of charge increases toward the upper side and before it increases toward the lower side, the amount of charge is reset. Similarly, after the amount of charge increases toward the lower side and before it increases toward the upper side, the amount of charge is reset. In this way, the amount of charge varies up and down based on the reset amount of charge. In other words, a signal change occurs in the detection electrode RL(n) according to the touch.

[0104] The drive electrodes TL(0) to TL(p) are sequentially selected, and drive signals Tx(0) to Tx(p) are supplied as pulse signals to the selected drive electrodes. Consequently, detection signals Rx(0) to Rx(p) having voltage values corresponding to whether the finger FG touches a position near each intersection are output from the multiple detection electrodes RL(0) to RL(p) that intersect the selected drive electrodes. At the point where a difference ΔQ occurs in the amount of charge, the detection signals Rx(0) to Rx(p) are sampled and converted into digital signals using an analog-to-digital converter. By processing the converted digital signals, the coordinates of the touched position can be extracted.

[0105] <Integrated Structure of Display Device and Sensor Panel Coil>

[0106] The present inventors have considered that Figure 1 As shown in the figure, the display device 1 and the sensor board are prepared separately. Since the sensor board is expensive, the electronic device becomes expensive. Therefore, the inventors considered forming the coil L2 ( Figure 1 ), and integrate the display device and the sensor board.

[0107] Figure 6 1 is a cross-sectional view schematically showing a cross section of the display device 1 in which the sensor plate is integrated as a sensor layer (layer). Figure 6 and Figure 1 Similar, so the main points of difference are explained. Figure 1In the embodiment, a sensor plate may be prepared independently of the display device 1 and provided between the light guide plate and the magnetic sheet. Figure 6 In (A), a sensor layer is formed on a CF glass substrate CGB. Figure 6 In (B), the sensor layer is formed on the TFT glass substrate TGB. Thus, since the sensor layer corresponding to the sensor plate is provided in the display device 1, it is possible to suppress price increases.

[0108] As in Figure 2 and Figure 3 As explained in the text, during the magnetic field generation period TGT, the sensor board coil L2 generates a magnetic field, and during the magnetic field detection period TDT, the sensor board coil L2 detects the magnetic field generated by the pen coil L1. In other words, the sensor board coil L2 is used for both magnetic field generation and magnetic field detection. Figure 6 In (A), the coil L2 is formed by the layers formed on the CF glass substrate CGB. Figure 6 In (B), the coil L2 is formed by the layers formed on the TFT glass substrate TGB.

[0109] However, it is also possible to separately configure a coil for generating a magnetic field during the magnetic field generation period TGT and a coil for detecting a magnetic field during the magnetic field detection period TDT. Figure 6 The sensor layer shown in (B) constitutes a coil that generates a magnetic field (hereinafter also referred to as a magnetic field generating coil), Figure 6 The sensor layer shown in (A) constitutes a coil for detecting a magnetic field (hereinafter also referred to as a magnetic field detection coil). In addition, in the TFT glass substrate TGB, there are multiple layers that can be used as sensor layers. Therefore, it is also possible to Figure 6 The sensor layer shown in (B) constitutes a magnetic field generating coil and a magnetic field detecting coil respectively.

[0110] Figure 7 An example of a case where a magnetic field generating coil and a magnetic field detecting coil are separately constituted is shown. Figure 7 In FIG, it is shown that the magnetic field generating coil and the magnetic field detecting coil are formed by the layers formed on the TFT glass substrate TGB. Figure 7 In , CX(n) to CX(n+2) represent, for example, magnetic field generating coils, and CY(n) to CY(n+2) represent magnetic field detecting coils. Figure 7 in Figure 4The driving electrodes TL(0) to TL(p) described in the figure are used as a layer constituting a magnetic field generating coil, and the signal lines SL(0) to SL(p) that transmit image information are used as a layer constituting a magnetic field detecting coil. As will be described later, the signal lines SL(0) to SL(p) are formed of a layer formed on the TFT glass substrate TGB, similarly to the driving electrodes TL(0) to TL(p). Figure 7 , extending in the longitudinal direction and arranged in parallel in the transverse direction.

[0111] like Figure 4 and Figure 7 As shown, the driving electrodes TL(0) to TL(p) extend in parallel with each other in the horizontal direction. Figure 7 As shown, one end of each of the drive electrodes TL(n+1) and TL(n+2) is electrically connected to one end of each of the drive electrodes TL(n+6) and TL(n+7), and the other end of each of the drive electrodes TL(n) to TL(n+2) is electrically connected to the other end of each of the drive electrodes TL(n+6) to TL(n+8). This allows the formation of a tertiary winding coil CX(n) with the drive electrodes TL(n) to TL(n+2) and TL(n+6) to TL(n+8). Similarly, by electrically connecting predetermined drive electrodes during the magnetic field generation period TGT, tertiary winding coils CX(n+1) and CX(n+2) can be formed.

[0112] Similarly, during the magnetic field detection period TDT, one end of each of the signal lines SL(n+1) and SL(n+2) is electrically connected to one end of each of the signal lines SL(n+6) and SL(n+7), and the other end of each of the signal lines SL(n) to SL(n+2) is electrically connected to the other end of each of the signal lines SL(n+6) to SL(n+8). This allows the formation of a tertiary winding coil CY(n) with the signal lines SL(n) to SL(n+2) and SL(n+6) to SL(n+8). Similarly, by electrically connecting predetermined signal lines during the magnetic field detection period TDT, tertiary winding coils CY(n+1) and CY(n+2), etc., can be formed.

[0113] The coils CX(n) to CX(n+2) and the coils CY(n) to CY(n+2) cross each other in an electrically isolated state. For example, one end of the driving electrode TL(n) constituting the coil CX(n) corresponds to Figure 2 The terminal PT shown is supplied with power from the Figure 1The output of the transmission amplifier AP1 shown in FIG. 1 supplies the ground voltage Vss to the other end of the driving electrode TL(n+8). Figure 2 As described in (A), a magnetic field is generated in the coil CX(n). The magnetic field generated in the coil CX(n) generates a magnetic field in the capacitive element C( Figure 2 ) accumulates charge in it.

[0114] During the magnetic field detection period TDT, the predetermined signal lines are electrically connected to form coils CY(n) to CY(n+2). The charge accumulated in the capacitive element C inside the pen causes the coil L1 ( Figure 1 ) generates a magnetic field. This magnetic field is detected by coils CY(n) to CY(n+2). This makes it possible to detect whether the pen is approaching, the area it is approaching, and the distance from the pen.

[0115] <Technical Issues with Magnetic Field Generating Coils>

[0116] In the electromagnetic induction method, the present inventors studied the configuration of a display device using a magnetic field generating coil before the present invention. Figure 36 and Figure 37 This is a block diagram showing the structure of a display device previously studied by the present inventor. Figure 7 Similarly, the case of using driving electrodes will be described.

[0117] exist Figure 36 and Figure 37 In , TL(n) to TL(n+5) represent driving electrodes. In addition, USR(n) to USR(n+5) and USL(n) to USL(n+5) represent unit driving circuits. Figure 36 and Figure 37 In the figure, VCOM represents a voltage wiring for supplying a ground voltage Vss, TSV represents a signal wiring for supplying a drive signal TSVCOM whose voltage periodically changes, and CNR and CNL represent signal wirings for connecting drive electrodes during the magnetic field generation period TGT.

[0118] In these figures, SL11 to SL13, SL21 to SL23, SL31 to SL33, SL41 to SL43, SL51 to SL53, and SL61 to SL63 represent switches. Switches SL11 to SL13 form a first switch group corresponding to drive electrode TL(n). Similarly, switches SL21 to SL23 form a first switch group corresponding to drive electrode TL(n+1), switches SL31 to SL33 form a first switch group corresponding to drive electrode TL(n+2), and switches SL41 to SL43 form a first switch group corresponding to drive electrode TL(n+3). Furthermore, switches SL51 to SL53 form a first switch group corresponding to drive electrode TL(n+4), and switches SL61 to SL63 form a first switch group corresponding to drive electrode TL(n+5).

[0119] Among the switches that make up the first switch group, SL11, SL21, SL31, SL41, SL51, and SL61 serve as first switches, each connected to the signal line TSV and one end of the corresponding drive electrode. Furthermore, among the switches that make up the first switch group, SL12, SL22, SL32, SL42, SL52, and SL62 serve as second switches, each connected to the voltage line VCOM and one end of the corresponding drive electrode. Furthermore, among the switches that make up the first switch group, SL13, SL23, SL33, SL43, SL53, and SL63 serve as third switches, each connected to the signal line CNL and one end of the corresponding drive electrode.

[0120] exist Figure 36 and Figure 37 In the diagram, SR11 to SR13, SR21 to SR23, SR31 to SR33, SR41 to SR43, SR51 to SR53, and SR61 to SR63 also represent switches. Switches SR11 to SR13 form a second switch group corresponding to drive electrode TL(n). Similarly, switches SR21 to SR23 form a second switch group corresponding to drive electrode TL(n+1), switches SR31 to SR33 form a second switch group corresponding to drive electrode TL(n+2), and switches SR41 to SR43 form a second switch group corresponding to drive electrode TL(n+3). Furthermore, switches SR51 to SR53 form a second switch group corresponding to drive electrode TL(n+4), and switches SR61 to SR63 form a second switch group corresponding to drive electrode TL(n+5).

[0121] Here, SR11, SR21, SR31, SR41, SR51, and SR61, among the switches making up the second switch group, also serve as first switches. Each first switch is connected to the signal line TSV and the other end of the corresponding drive electrode. Furthermore, SR12, SR22, SR32, SR42, SR52, and SR62, among the switches making up the second switch group, serve as second switches. Each second switch is connected to the voltage line VCOM and the other end of the corresponding drive electrode. Furthermore, SR13, SR23, SR33, SR43, SR53, and SR63, among the switches making up the second switch group, serve as third switches. Each third switch is connected to the signal line CNL and one end of the corresponding drive electrode.

[0122] Each unit drive circuit USL(n) to USL(n+5) corresponds to a respective drive electrode TL(n) to TL(n+5), and each unit drive circuit USR(n) to USR(n+5) also corresponds to a respective drive electrode TL(n) to TL(n+5). During magnetic field touch detection and electric field touch detection, each unit drive circuit USL(n) to USL(n+5) and USR(n) to USR(n+5) controls the first switch group and the second switch group to generate a magnetic field and an electric field in the corresponding drive electrodes.

[0123] That is, when a magnetic field is generated in the corresponding drive electrode, the first and second switch groups are controlled by selecting two drive electrodes arranged so as to be separated from the corresponding drive electrode. A coil is formed by the two selected drive electrodes, and the corresponding drive electrode is arranged on the inner side of the coil. As a result, a strong magnetic field is generated in the area of the corresponding drive electrode. On the other hand, when an electric field is generated in the corresponding drive electrode, the first and second switch groups are controlled by selecting the corresponding drive electrode.

[0124] <<Magnetic Field Touch Detection>>

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

[0126] Specifically, unit drive circuit USL(n+2) turns on the first switch SL21 and the second switch SL42 of the first switch group (SL21, SL22, SL23) and (SL41, SL42, SL43), and turns off the remaining switches. Furthermore, unit drive circuit USR(n+2) turns on the third switches SR23 and SR43 of the second switch group (SR21, SR22, SR23) and (SR41, SR42, SR43), and turns off the remaining switches.

[0127] Therefore, if Figure 36 As shown, one end of drive electrode TL(n+1) is connected to signal wiring TSV via first switch SL21, while the other end of drive electrode TL(n+1) is connected to signal wiring CNR via third switch SR23. Furthermore, one end of drive electrode TL(n+3) is connected to voltage wiring VCOM via second switch SL42, while the other end of drive electrode TL(n+3) is connected to signal wiring CNR via third switch SR43. As a result, the other ends of drive electrodes TL(n+1) and TL(n+3), arranged in parallel with drive electrode TL(n+2) sandwiched between them, are electrically connected via signal wiring CNR, forming a coil with drive electrode TL(n+2) positioned inside.

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

[0129] exist Figure 36 In FIG. 1 , arrows I1 and I2 represent the currents flowing through the driving electrodes TL(n+1) and TL(n+3) by the driving signal TSVCOM, and the directions thereof. The driving electrode TL(n+1) generates the current I1 by flowing through the driving electrode TL(n+1). The direction of the current I2 flowing in the driving electrode TL(n+3) is opposite to the direction of the current I1, so the driving electrode TL(n+3) generates the magnetic field indicated by the dotted arrow. The magnetic field in the direction shown is: At the driving electrode TL(n+2), the magnetic field generated by the driving electrode TL(n+1) and the magnetic field generated by the driving electrode TL(n+3) overlap to generate a strong magnetic field.

[0130] It should be noted that, except for the above-mentioned first switch group (SL21, SL22, SL23), (SL41, SL42, SL43) and the second switch group (SR21, SR22, SR23), (SR41, SR42, SR43), the first switch, second switch and third switch in the first switch group and the second switch group are turned off by unit drive circuits other than the above-mentioned unit drive circuits USL(n+2) and USR(n+2).

[0131] The unit drive circuits USL(n) to USL(n+5) are connected in series and function as a shift register. Similarly, USR(n) to USR(n+5) are also connected in series and function as a shift register. For example, selection information for selecting the drive electrode that generates a magnetic field is set in the unit drive circuits USL(n) and USR(n), and the selection information is sequentially shifted toward the unit drive circuits USL(n+5) and USR(n+5). As described above, the unit drive circuit to which the selection information reaches controls the first switch group and the second switch group so as to generate a magnetic field in the corresponding drive electrode. That is, Figure 36 This shows the state when the selection information reaches the unit drive circuits USL(n+2) and USR(n+2).

[0132] By the shift operation, the state when the selection information reaches the unit drive circuit USL(n+3) and USR(n+3) is Figure 37 The action when the selection information reaches the unit drive circuit USL(n+3) and USR(n+3) is the same as that in Figure 36 The actions described in are the same, so the description is omitted.

[0133] As the selection information shifts in this manner, the drive electrodes that generate the strong magnetic field are also switched (moved) in sequence.

[0134] <<Electric Field Touch Detection>>

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

[0136] In electric-field touch detection, unit drive circuits USL(n+2) and USR(n+2) control a first switch group and a second switch group, which differ from those used in magnetic-field touch detection. Specifically, they control the first switch group (SL31, SL32, SL33) and the second switch group (SR31, SR32, SR33) connected to drive electrode TL(n+2) corresponding to unit drive circuits USL(n+2) and USR(n+2). 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 turned on, while the second switches SL32, SR32 and the third switches SL33, SR33 are turned off.

[0137] During electric field touch detection, a drive signal TSVCOM with a periodically changing voltage is also supplied to the signal wiring TSV. Therefore, the drive signal TSVCOM is supplied to the drive electrode TL(n+2) from both ends via the first switches SL31 and SR31 as an electric field drive signal. At this time, the first, second, and third switches in the remaining first and second switch groups are turned off. As a result, the drive electrodes TL(n) to TL(n+1) and TL(n+3) to TL(n+5) are in a floating state.

[0138] When the selection information is shifted from unit drive circuits USL(n+2) and USR(n+2) to unit drive circuits USL(n+3) and USR(n+3), the unit drive circuits USL(n+3) and USR(n+3) control the first and second switch groups connected to the corresponding drive electrode TL(n+3) in the same manner as described above. Consequently, the drive signal TSVCOM is supplied to the drive electrode TL(n+3) as an electric field drive signal.

[0139] <<Technical Issues>>

[0140] In the case of magnetic field touch detection, in order to form a magnetic field generating coil, as mentioned above, it is required to connect multiple drive electrodes arranged in parallel with each other through signal wiring (CNR, CNL) and a third switch. In addition, in this case, the switch group connected to the drive electrode is controlled, and the drive electrode is a drive electrode different from the drive electrode arranged in the area where a strong magnetic field is generated. On the other hand, in the case of electric field touch detection, the switch group connected to the drive electrode is controlled, and the drive electrode is arranged in the area where an electric field is generated. Therefore, a technical problem such as the control becomes complicated is generated. Moreover, a technical problem such as the area occupied by the drive circuit (control circuit) for control is also increased.

[0141] <Overall Configuration of Display Device>

[0142] Figure 8 1 is a block diagram showing the configuration of a display device 1 according to Embodiment 1. Although not particularly limited, the following description will be given taking as an example a case where the display device 1 is a liquid crystal display device. Figure 8 In the embodiment, 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. Furthermore, the display device 1 includes selection drive circuits (first drive circuit and second drive circuit) SSR and SSL, a switching adjustment circuit SCX, and an amplifier circuit AMP. These devices and circuits included in the display device 1 will be described in detail later, so an overview will be provided here.

[0143] Display Panel 2 is used at the back Figure 12 For example, a pixel array LCD is provided in which a plurality of pixels are 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 provided. Here, the signal lines are provided in respective columns of the pixel array LCD, the drive electrodes are provided in respective rows of the pixel array LCD, and the plurality of scan lines are provided in respective rows of the pixel array LCD. Figure 8 As described in the specification, the signal wiring extends in the longitudinal direction (column direction) and is arranged in parallel in the transverse direction (row direction). In addition, the drive electrode extends in the transverse direction and is arranged in parallel in the longitudinal direction. Moreover, the scan line extends in the transverse direction and is arranged in parallel in the longitudinal direction. In this case, the pixel is arranged in the portion where the signal line and the scan line intersect. During the display period (display period), the pixel is selected through the signal line and the scan line, and the voltage of the signal line at this time and the voltage of the drive electrode (display drive signal) are applied to the selected pixel, and the selected pixel is displayed according to the 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, generates an image signal Sn based on the image information supplied to the input terminal Ti, and supplies it to the signal line driver D-DRV. During the display period, the signal line driver D-DRV time-division-multiplexes the supplied image signal Sn and supplies it to the signal line selector 3. Furthermore, the control circuit D-CNT receives a timing signal supplied to an external terminal Tt and a control signal SW from the touch control device 6 to generate various control signals. The control signals generated by the control circuit D-CNT include the select signals SEL1 and SEL2 supplied to the signal line selector 3, the synchronization signal TSHD, the clock signal CLK, the magnetic field enable signal SC_EN, the electric field enable signal TC_EN, the drive signal TSVCOM, the control signal Y-CNT related to touch detection, and the clock signal CLK.

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

[0146] During the display period, the signal line driver D-DRV supplies image signals Sn to the signal line selector 3 in a time-division multiplexed manner based on selection signals SEL1 and SEL2. The signal line selector 3 is connected to multiple signal lines arranged in the display panel 2 and, during the display period, supplies the supplied image signals to the appropriate signal lines based on selection signals SEL1 and SEL2. During the display period, the gate driver 5 generates scan line signals Vs0 to Vsp based on timing signals from the control circuit D-CNT and supplies them to the scan lines within the display panel 2. During the display period, the gate driver 5 selects pixels connected to scan lines supplied with high-level scan line signals. The selected pixels display according to the image signals supplied to the signal lines at that time, thereby displaying.

[0147] The touch control device 6 includes a detection circuit DET that receives sensor signals S(0) to S(p), a processing circuit PRS that processes a detection signal DET-D from the detection circuit DET to extract the coordinates of the touched location, and a control circuit T-CNT. The control circuit T-CNT receives a synchronization signal TSHD, a magnetic field enable signal SC_EN, and an electric field enable signal TC_EN from the display control device 4, and controls the touch control device 6 so that it operates synchronously with the display control device 4.

[0148] Specifically, when the synchronization signal TSHD, the magnetic field enable signal SC_EN, and the electric field enable signal TC_EN indicate touch detection, the control circuit T-CNT controls the detection circuit DET and the processing circuit PRS to operate. Furthermore, the control circuit T-CNT receives the detection signal from the detection circuit DET, generates 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 sides 2-U and 2-D parallel to the rows of the pixel array LCD, and sides 2-R and 2-L parallel to the columns of the pixel array LCD. Side 2-U and side 2-D are opposite sides, and are arranged so that the plurality of drive electrodes and the plurality of scan lines of the pixel array LCD are sandwiched between them. Furthermore, side 2-R and side 2-L are also opposite sides, and are arranged so that the plurality of signal lines of the pixel array LCD are sandwiched between them.

[0150] The selection drive circuit SSR is arranged along the side 2-R of the display panel 2, and the selection drive circuit SSL is arranged along the side 2-L of the display panel 2. The selection drive circuit SSR is coupled to a plurality of drive electrodes arranged in the display panel 2 on the side 2-R of the display panel 2, and the selection drive circuit SSL is coupled to a plurality of drive electrodes arranged in the display panel 2 on the side 2-L of the display panel 2. In other words, the selection drive circuits SSR and SSL are external to the display panel 2 and connected to the drive electrodes arranged in the display panel 2.

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

[0152] When magnetic field touch detection is specified by the magnetic field enable signal SC_EN, the drive circuit SR-R generates and outputs a selection signal based on the selection information stored in the shift register. Although not specifically limited, in this first embodiment, if magnetic field touch detection is specified, the drive circuit SR-R generates two selection signals based on the selection information. On the other hand, even if electric field touch detection is specified by the electric field enable signal TC_EN, the drive circuit SR-R generates and outputs a selection signal based on the selection information stored in the shift register. Although not specifically limited, in this first embodiment, if electric field touch detection is specified, the drive circuit SR-R generates a single selection signal based on the selection information.

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

[0154] In this first embodiment, during magnetic field touch detection, ground voltage Vss is supplied to voltage wiring VCOM. Furthermore, during magnetic field and electric field touch detection, a drive signal TSVCOM, whose voltage periodically varies, is supplied to signal wiring TSV. Therefore, during magnetic field touch detection, drive signal TSVOM is supplied as a magnetic field drive signal via selection circuit SR-C to the drive electrode specified by one of the two selection signals. Meanwhile, ground voltage Vss is supplied to the drive electrode specified by the other selection signal via selection circuit SR-C.

[0155] Furthermore, during electric field touch detection, the drive signal TSVCOM is supplied as an electric field drive signal to the drive electrode designated by the selection signal via the selection circuit SR-C.

[0156] The selection drive circuit SSL has the same configuration as the selection drive circuit SSR. Specifically, 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 multiple shift stages. Selective information SEI is set in the shift register in response to the control signal Y-CNT. The set selective information is sequentially shifted in synchronization with the clock signal CLK.

[0157] When magnetic field touch detection is specified by the magnetic field enable signal SC_EN, the drive circuit SL-R generates and outputs a selection signal based on the selection information stored in the shift register. If magnetic field touch detection is specified, the drive circuit SL-R generates two selection signals based on the selection information. On the other hand, even when electric field touch detection is specified by the electric field enable signal TC_EN, the drive circuit SL-R generates and outputs a selection signal based on the selection information stored in the shift register. However, if electric field touch detection is specified, the drive circuit SR-R generates a single selection signal based on the selection information.

[0158] The selection circuit SL-C receives a selection signal from the drive circuit SL-R and connects the drive electrodes specified by the selection signal to the signal wiring TSV and the voltage wiring VCOM. Specifically, during magnetic field touch detection, the drive electrodes specified by one of the two selection signals are connected to the voltage wiring VCOM, while the drive electrodes specified by the other selection signal are connected to the signal wiring TSV. On the other hand, during electric field touch detection, the drive electrodes specified by one of the selection signals are connected to the signal wiring TSV.

[0159] Thus, during magnetic field touch detection, the ground voltage Vss is supplied to the drive electrode specified by one of the two selection signals via the selection circuit SL-C. Meanwhile, the drive signal TSVOM is supplied as a magnetic field drive signal to the drive electrode specified by the other selection signal via the selection circuit SL-C.

[0160] Furthermore, during electric field touch detection, the drive signal TSVCOM is supplied as an electric field drive signal to the drive electrode specified by the selection signal via the selection circuit SL-C.

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

[0162] During magnetic field touch detection, the drive electrodes specified by the selection information in the selection drive circuit SSR are the same as the drive electrodes specified by the selection information in the selection drive circuit SSL. In other words, during magnetic field touch detection, the selection drive circuits SSR and SSL each specify two drive electrodes from the plurality of drive electrodes. In this case, the drive electrodes connected to the voltage line VCOM in the selection circuit SR-C are connected to the signal line TSV in the selection circuit SL-C. Furthermore, the drive electrodes connected to the signal line TSV in the selection circuit SR-C are connected to the voltage line VCOM in the selection circuit SL-C.

[0163] As a result, currents corresponding to the voltage changes of the magnetic field drive signal (drive signal TSVCOM) flow through each of the two designated drive electrodes, generating magnetic fields in each drive electrode. Furthermore, the directions of the flowing currents are diametrically opposed, so the magnetic fields generated in the area sandwiched between the two drive electrodes overlap, resulting in a strong magnetic field.

[0164] Furthermore, during electric field touch detection, the same drive electrode is connected to the signal wiring TSV in both the selection circuits SR-C and SL-C. Therefore, an electric field drive signal (drive signal TSVCOM) is supplied from both ends of the designated drive electrode, generating an electric field corresponding to the voltage change of the electric field drive signal.

[0165] A switching adjustment circuit SCX is arranged along side 2-U of the display panel 2. On the side of side 2-U, the switching adjustment circuit SCX is coupled to a plurality of signal lines arranged in the display panel 2. In other words, the switching adjustment circuit SCX is connected to the plurality of signal lines outside the display panel 2. Furthermore, the amplifier circuit AMP is coupled to the plurality of signal lines arranged in the display panel 2 via a signal line selector 3 arranged along side 2-D of the display panel 2.

[0166] When magnetic field touch detection is specified by the magnetic field enable signal SC_EN, the switching adjustment circuit SCX electrically connects the predetermined signal lines arranged on the display panel 2. Thus, since the signal lines arranged in parallel to each other are connected on the side 2-U, the signal lines are formed into a plurality of coils of the primary winding of the winding. The ends of each of the plurality of coils are on the side 2-D and are connected to the amplifier circuit AMP via the signal line selector 3. The coil of the primary winding functions as a magnetic field detection coil. That is, during the magnetic field detection period TDT( Figure 2 ), the magnetic field generated by the pen generates a signal change in the magnetic field detection coil formed by the signal line. This signal change is supplied to the amplifier circuit AMP for amplification, and is output as sensor signals S(0) to S(p), which are then supplied to the detection circuit DET.

[0167] In addition, during electric field touch detection, the signal lines are not connected through the switching adjustment circuit SCX, so the amplifier circuit AMP amplifies the signal changes of the signal lines that change according to the presence or absence of finger touch, and supplies them as sensing signals S(0)~S(p) to the detection circuit DET.

[0168] The detection circuit processes the supplied sensor signals S(0) to S(p) and supplies them to the processing circuit PRS. Thus, when performing magnetic field touch detection, the processing circuit PRS determines whether a pen touch is present, the touched coordinates, and the pen pressure, and outputs these signals from the external terminal To. Furthermore, when performing electric field touch detection, the processing circuit PRS determines whether a finger touch is present, the touched coordinates, and outputs these signals from the external terminal To.

[0169] Here, the case where the magnetic field detection coil is a primary winding is described, but it is not limited to this. By providing the same function as the switching adjustment circuit SCX in the amplifier circuit AMP, three or more signal lines can be connected in series to form a coil with 1.5 or more windings.

[0170] <Module Configuration of Display Device 1>

[0171] Figure 9 1 is a schematic top view showing the overall structure of the module 900 in which the display device 1 is mounted. Figure 9 In this figure, 901 represents the actual configuration. Figure 4 The area in the TFT glass substrate TGB shown in FIG. 902 represents the area having Figure 4 The regions of the TFT glass substrate TGB and the CF glass substrate CGB are shown in FIG. In module 900, the TFT glass substrate TGB is integrated. That is, the TFT glass substrate TGB is common in regions 901 and 902. In region 902, as shown in FIG. Figure 4 As shown, a CF glass substrate CGB and the like are also formed on the upper surface of the TFT glass substrate TGB.

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

[0173] In the area 902, between the side 2-L of the display panel 2 and the long side 900-L of the module 900, there is a Figure 8The gate driver 5 and the selection drive circuit SSL shown in FIG. In addition, in the area between the side 2-R of the display panel 2 and the long side 900-R of the module 900, there is configured Figure 8 The selection drive circuit SSR shown in FIG. 1 is configured in the area between the side 2-U of the display panel 2 and the short side 900-U of the module 900. Figure 8 The switching adjustment circuit SCX represented in .

[0174] In addition, the area between the side 2-D of the display panel 2 and the short side 900-D of the module 900 is configured with Figure 8 The signal line selector 3, the amplifier circuit AMP and the driving semiconductor device DDIC are shown.

[0175] In this first embodiment, Figure 8 The signal line driver D-DRV and the control circuit D-CNT shown are built into one semiconductor device. In this specification, the one semiconductor device is represented as a driving semiconductor device DDIC. Figure 8 The touch control device 6 shown is also built into a single semiconductor device. In this specification, to distinguish it from the driving semiconductor device DDIC, the semiconductor device incorporating the touch control device 6 is also referred to as the touch semiconductor device 6. Of course, the driving semiconductor device DDIC and the touch semiconductor device 6 can each be composed of multiple semiconductor devices. Furthermore, for example, the driving semiconductor device DDIC can also include an amplifier circuit AMP.

[0176] In this first embodiment, the amplifier circuit AMP is disposed in region 901 and is constructed using wiring and components formed on the TFT glass substrate TGB in region 901. These components are, for example, thin-film transistors (hereinafter also referred to as TFT transistors). Furthermore, the driving semiconductor device DDIC is mounted on the TFT glass substrate so as to cover the amplifier circuit AMP when viewed from above. This prevents the lower frame of the display panel 2 from becoming larger.

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

[0178] exist Figure 9 In FIG, FB1 and FB2 represent flexible cables. Although not particularly limited, the touch semiconductor device 6 is installed in the flexible cable FB1, and the connector CN is installed in the flexible cable FB2. Figure 8The sensing signals S(0) to S(p) described in the above are supplied from the amplifier circuit AMP to the touch semiconductor device 6 via the connector CN. Furthermore, signals are sent and received between the touch semiconductor device 6 and the driving semiconductor device DDIC via the connector CN. Figure 9 , the synchronization signal TSHD is depicted as an example of the signal to be transmitted and received.

[0179] As described above, the display panel 2 has a pixel arrangement in which a plurality of pixels are arranged in a matrix. The pixel arrangement includes a plurality of drive electrodes TL(0) to TL(p) and scanning lines GL(0) to GL(p) arranged along the rows of the arrangement, and a plurality of signal lines SL(0) to SL(p) arranged along the columns of the arrangement. Figure 9 In FIG, two driving electrodes TL(n), TL(m) and two signal wirings SL(k), SL(n) are shown as an example. Figure 9 In the figure, the scanning lines are omitted. Pixels are arranged at the intersections of the signal lines SL(0) to SL(p) and the scanning lines or the driving electrodes TL(0) to TL(p). Figure 9 R, G, and B indicated on the four sides of the display panel 2 show pixels corresponding to the three primary colors.

[0180] Figure 10 1 is a top view showing the relationship between the driving electrodes and the signal lines included in the display panel 2. The display panel 2 includes the driving electrodes TL(0) to TL(p) and the signal lines SL(0) to SL(p). Figure 10 In FIG, a portion of these driving electrodes and signal lines are exemplified as driving electrodes TL(n-6) to TL(n+9) and signal lines SL(n-6) to SL(n+9). Figure 10 In the figure, scan lines are omitted.

[0181] If Figure 10 The driving electrodes TL(n-6) to TL(n+9) are shown as examples to explain 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 electrode is an electrode with a lower sheet resistance than the first electrode. Figure 10 In FIG, one of the plurality of second electrodes included in each driving electrode is represented as an auxiliary electrode SM. It should be noted that, in order to avoid the complexity of the drawings, Figure 10 In FIG. 5 , only the auxiliary electrodes included in the driving electrodes TL(n−6) and TL(n+9) are denoted by the reference symbol SM.

[0182] Similar to the first electrodes (transparent electrodes) that constitute the drive electrodes, the auxiliary electrodes SM extend in the row direction of the arrangement and are electrically connected to the first electrodes. This reduces the combined resistance (impedance) of the drive electrodes, which include the first electrodes and the auxiliary electrodes (second electrodes). In this specification, unless otherwise specified, the first electrodes (transparent electrodes) and the second electrodes (auxiliary electrodes SM) connected to the first electrodes are collectively referred to as the drive electrodes.

[0183] <Display Panel Structure>

[0184] Figure 11 This is a cross-sectional view showing the structure of the display panel 2 included in the display device 1 involved in the first embodiment. When viewed from the perspective of display, the area (first area) of the display panel 2 is the active area (active area), which is the display area for display. In contrast, the area outside the display panel 2 (second area) is the area where no display is performed and can be regarded as the inactive area (inactive area) or the peripheral area. If Figure 9 For the purpose of explanation, the active area is an area surrounded by the sides 2 -U, 2 -D, 2 -R and 2 -L of the display panel 2 .

[0185] Figure 11 express Figure 9 AA' section of the display panel 2 shown in FIG. In this first embodiment, in order to perform color display, three pixels corresponding to the three primary colors of 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 the display period, the signal line that transmits the color image signal is composed of three signal lines. Figure 11 In order to show the specific structure of the display panel 2, an example of color display is shown.

[0186] In the description Figure 11 Before, Figure 11 The reference numerals of the signal lines used in the description are explained. The signal lines SL(0) to SL(p) represent signal lines that transmit color image signals during the display period. Each signal line has three signal lines that transmit image signals to three sub-pixels. Figure 11In the figure, the English letters of the corresponding sub-pixels are marked after the reference numerals of the signal lines to distinguish the three signal lines. If the signal line SL(n) is taken as an example, the signal line SL(n) includes signal lines SL(n)R, SL(n)G, and SL(n)B. Here, the English letter R marked after the reference numeral SL(n) indicates that during the display period, the signal line that transmits the image signal to the sub-pixel corresponding to the red (R) primary color, the English letter G marked after the reference numeral SL(n) indicates that the signal line that transmits the image signal to the sub-pixel corresponding to the green (G) primary color, and the English letter B marked after the reference numeral SL(n) indicates that the signal line that transmits the image signal to the sub-pixel corresponding to the blue (B) primary color.

[0187] exist Figure 11 In the figure, 1100 represents a TFT glass substrate (in Figure 4 TGB in the TFT glass substrate 1100). A first wiring layer (metal wiring layer) 1101 is formed on the TFT glass substrate 1100. The scanning line GL(n) is formed by the wiring formed in the first wiring layer 1101. An insulating layer 1102 is formed on the first wiring layer 1101, and a second wiring layer (metal wiring layer) 1103 is formed on the insulating layer 1102. 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 formed by the wiring formed in the second wiring layer 1103. In this figure, to indicate that these signal lines are formed by the second wiring layer 1103, the reference numeral 1103 representing the second wiring layer is recorded in brackets after the reference numerals of the signal lines. For example, the signal line SL(n)G is represented 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 driving electrode TL(n) and the auxiliary electrode SM are formed by the wiring formed in the third wiring layer 1105. Here, the driving 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 driving electrode TL(n) and is electrically connected to the driving electrode TL(n). The resistance value of the driving electrode TL(n) as a transparent electrode is relatively high, but by electrically connecting the auxiliary electrode SM to the driving electrode TL(n), the combined resistance can be reduced. Here, the reference numerals

[1105] marked on the driving electrode and the auxiliary electrode also indicate that they are formed 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 In the figure, CR, CB, and CG are color filters. A liquid crystal layer 1107 is interposed between the color filters CR (red), CG (green), and CB (blue) and the insulating layer 1106. Pixel electrodes LDP are provided at the intersections of scan lines and signal lines. A corresponding color filter CR, CG, or CB is provided above each pixel electrode LDP. A black matrix BM is provided between the color filters CR, CG, and CB.

[0190] In addition, Figure 11 Omitted in, on the color filters CR, CG, CB, such as Figure 4 as well as Figure 6 As shown in FIG. 1 , a CF glass substrate CGB is formed. Moreover, on the CF glass substrate CGB, as shown in FIG. Figure 4 As shown, detection electrodes RL(0) to RL(p) and a polarizing plate are formed.

[0191] <Pixel Arrangement>

[0192] Next, the circuit configuration of the display panel 2 will be described. Figure 12 Yes Figure 8 and Figure 9 The circuit diagram of the display panel 2 is shown. Figure 12 In Chinese, it is also used with Figure 11 The same display format represents the signal line. In this figure, a plurality of SPix represented by a single dot-dashed line each represents a liquid crystal display element (sub-pixel). The sub-pixels SPix are arranged in a matrix in the display panel 2 to form a liquid crystal element arrangement (pixel arrangement) LCD. The pixel arrangement LCD includes a plurality of scanning 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. In addition, the pixel arrangement LCD has driving electrodes TL(0) to TL(p) arranged in each row and extending in the row direction.

[0193] exist Figure 12 In FIG, only the portion of the pixel arrangement related to the scanning 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 driving electrodes TL(n-1) to TL(n+1) is shown. Figure 12 In FIG. 1 , for ease of explanation, the driving electrodes TL(n−1) to TL(n+1) are shown as being arranged in each row, but one driving electrode may be arranged for a plurality of rows.

[0194] Each subpixel SPix arranged at the intersection of rows and columns in a pixel-arranged LCD includes a TFT transistor Tr formed on a TFT glass substrate 1100 and a liquid crystal element LC, one terminal of which is connected to the source of the TFT transistor Tr. In the pixel-arranged LCD, the gates of the TFT transistors Tr in the subpixels SPix arranged in the same row are connected to a scan line arranged in the same row, and the drains of the TFT transistors Tr in the subpixels SPix arranged in the same column are connected to a signal line arranged in the same column. In other words, the subpixels SPix are arranged in a matrix, with scan lines arranged in each row, and the subpixels SPix arranged in the corresponding row are connected to the scan lines. Furthermore, signal lines are arranged in each column, and the subpixels SPix arranged in the corresponding column are connected to the signal lines. Furthermore, the other ends of the liquid crystal elements LC in the subpixels SPix arranged in the same row are connected to the drive electrodes arranged in the row.

[0195] If Figure 12 , in the figure, the gate of the TFT transistor Tr of each of the plurality of sub-pixels SPix arranged in the uppermost row is connected to the scanning line GL(n-1) arranged in the uppermost row. In addition, in the figure, the drain of the TFT transistor Tr of each of the plurality of sub-pixels SPix arranged in the leftmost column is 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 plurality of sub-pixels SPix arranged in the uppermost row is connected to the scanning line GL(n-1) arranged in the uppermost row. Figure 12 In the embodiment, it is connected to the driving electrode TL(n-1) arranged in the uppermost row.

[0196] As described above, one sub-pixel SPix corresponds to one of the three primary colors. Therefore, the three primary colors of R, G, and B are formed by three sub-pixels SPix. Figure 12 In the same row, three sub-pixels SPix are arranged continuously to form a color pixel Pix, and color is expressed in the pixel Pix. Figure 12 In the image, the sub-pixel SPix indicated by 1200R becomes the R (red) sub-pixel SPix(R), the sub-pixel SPix indicated by 1200G becomes the G (green) sub-pixel SPix(G), and the sub-pixel SPix indicated by 1200B becomes the B (blue) sub-pixel SPix(B). To this end, a red color filter CR is provided as a color filter in the sub-pixel SPix(R) indicated by 1200R, a green color filter CG is provided as a color filter in the sub-pixel SPix(G) indicated by 1200G, and a blue color filter CB is provided as a color filter in the sub-pixel SPix(B) indicated by 1200B.

[0197] In addition, an image signal corresponding to R (red) among the signals representing one pixel is supplied from the signal line selector 3 to the signal line SL(n)R, an image signal corresponding to G (green) is supplied from the signal line selector 3 to the signal line SL(n)G, and an image signal corresponding to B (blue) is supplied from the signal line selector 3 to the signal line SL(n)B.

[0198] Although not particularly limited, the TFT transistor Tr in each sub-pixel SPix is an N-channel TFT transistor. Figure 8 and Figure 9 ), supplying pulsed scan line signals that sequentially become high levels according to this order. Specifically, in the pixel array LCD, the voltages of the scan lines sequentially become high levels, from the scan line GL(0) arranged in the upper row toward the scan line GL(p) arranged in the lower row. Consequently, in the pixel array LCD, the TFT transistors Tr in the sub-pixels SPix arranged in the upper row toward the sub-pixels SPix arranged in the lower row are sequentially turned on (conducting).

[0199] When the TFT transistor Tr is turned on, the image signal supplied to the signal line is supplied to the liquid crystal element LC via the on-state TFT transistor. In the liquid crystal element LC, the electric field changes depending on the voltage difference between the display drive signal supplied to the drive electrodes TL(0) to TL(p) and the voltage of the supplied image signal, and the modulation of the light passing through the liquid crystal element LC changes. As a result, a color image corresponding to the image signal supplied to the signal lines SL(0)R, SL(0)G, SL(n)B to SL(p)R, SL(p)G, and SL(p)B is displayed on the display panel 2 in synchronization with the scan line signal supplied to the scan lines GL(0) to GL(p).

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

[0201] Here, if the description Figure 8 and Figure 9 The configuration of the display panel 2 shown, and Figure 12 The correspondence between the shown and the circuit diagram is as follows.

[0202] The pixel arrangement LCD has a pair of sides substantially parallel to the rows in which the pixels are arranged, and a pair of sides substantially parallel to the columns in which the pixels are arranged. Figure 8 and Figure 9 The short sides 2-U and 2-D of the display panel 2 shown correspond to the first and second sides, and a pair of sides parallel to the columns of the pixel LCD are the third and fourth sides corresponding to the long sides 2-L and 2-R of the display panel 2.

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

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

[0205] In a pixel array LCD, a gate driver 5 and a selection drive circuit SSL are arranged along the third side of a pair of sides (third side and fourth side) parallel to the columns, i.e., the long side 2-L of the display panel 2. In a pixel array LCD, a scanning line signal from the gate driver 5 is supplied to the scanning lines GL(0) to GL(p) on the third side. Figure 9 In the embodiment, a gate driver 5 is arranged along the long side 2-L of the display panel 2, but the gate driver 5 can also be divided into two, one along the long side 2-L (the third side of the pixel arrangement LCD) and the other along the long side 2-R (the fourth side of the pixel arrangement LCD). In addition, in the pixel arrangement LCD, during the display period, a display drive signal is supplied to the drive electrode on the third side from the selection drive circuit SSL. Moreover, during the magnetic field generation period TGT of the magnetic field touch detection, or during the electric field touch detection, a magnetic field drive signal or an electric field drive signal is supplied to the designated drive electrode on the third side from the selection drive circuit SSL.

[0206] Along the fourth side of the pixel arrangement LCD, that is, the long side 2-R of the display panel 2, as shown in FIG. Figure 9As shown, a selection drive circuit SSR is provided. During the display period, a display drive signal is supplied from the selection drive circuit SSR to the common electrode on this fourth side. Meanwhile, during magnetic field touch detection or electric field touch detection, a magnetic field drive signal or electric field drive signal is supplied from this fourth side to the designated drive electrode, similar to the selection drive circuit SSL described above.

[0207] While a pixel array LCD is specifically described for color display in the display panel 2, it can also be considered that a pixel array LCD is formed by a plurality of color pixels Pix (pixels), each composed of three sub-pixels SPix. In this case, the plurality of pixels Pix are arranged in a matrix to form a pixel array LCD. In each row of the pixel array LCD formed by the pixels Pix, corresponding scanning lines GL(0) to GL(p) and corresponding drive electrodes TL(0) to TL(p) are arranged, and in each column, signal lines SL(0) to SL(p) are arranged.

[0208] In this case, the three sub-pixels SPix are regarded as one pixel Pix, and the pixel Pix is regarded as having the same structure as the sub-pixel SPix. The selection terminals of the pixels Pix arranged in a matrix in the pixel arrangement LCD are connected to the scanning lines GL(0) to GL(p) arranged in the same row as the pixel Pix, one terminal of each pixel Pix is connected to the signal lines SL(0) to SL(p) arranged in the same column, and the other terminal of each pixel Pix is connected to the driving electrodes TL(0) to TL(p) arranged in the same column. Of course, one driving electrode can also correspond to multiple rows of the pixel arrangement LCD. In this case, the other terminals of the pixels Pix arranged in multiple rows are connected to a common driving electrode.

[0209] Thus, even when it is considered that the pixel arrangement LCD is composed of a plurality of pixels Pix, Figure 8 and Figure 9 The configuration of the display panel 2 shown in FIG. Figure 12 The correspondence of the circuit diagram shown is the same as that described previously.

[0210] The case where the number of sub-pixels SPix constituting a color pixel Pix is three has been described, but this is not limited to this. For example, in addition to the above-mentioned R, G, and B, a color pixel can also be constituted by sub-pixels of any one or more colors of white (W), yellow (Y), or the complementary colors of the above-mentioned R, G, and B (cyan (C), magenta (M), yellow (Y)).

[0211] <Selecting a drive circuit>

[0212] Next, use Figures 13 to 18 , the configuration and operation of the selection drive circuits SSL and SSR in the display device 1 according to the first embodiment will be described.

[0213] <<Overview of Operation of Selecting a Drive Circuit>>

[0214] In order to make the selection drive circuit easier to understand, first, the operation overview is described. In the first embodiment, the selection drive circuit SSR is as follows. Figure 8 As shown, it includes a drive circuit SR-R and a selection circuit SR-C. During the magnetic field generation period TGT of magnetic field touch detection, the drive circuit SR-R generates a selection signal that specifies the drive electrode that generates a strong magnetic field. In addition, during electric field touch detection, the drive circuit SR-R generates a selection signal that specifies the drive electrode that generates an electric field. During the magnetic field generation period TGT, the selection circuit SR-C connects the drive electrodes sandwiching the designated drive electrodes to the signal wiring TSV and the voltage wiring VCOM in such a manner that a magnetic field is generated in the drive electrodes designated by the selection signal. In addition, during electric field touch detection, the selection circuit SR-C connects the drive electrodes designated by the selection signal to the signal wiring TSV.

[0215] The drive circuit SR-R includes a plurality of unit drive circuits USR(0) to USR(p), each having a shift segment. These unit drive 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, selection information specifying the selected drive electrodes is shifted through the shift register formed by the plurality of unit drive circuits, thereby generating a selection signal for sequentially specifying the drive electrodes in the drive circuit SR-R.

[0216] Like the selection drive circuit SSR, the selection drive circuit SSL also includes a drive circuit SL-R and a selection circuit SL-C. Like the drive circuit SR-R, the drive circuit SL-R includes a plurality of 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 It is an explanatory diagram showing a touch detection operation in the display device 1 according to the first embodiment. Figure 13 (A) indicates that the touch detection operation is electric field touch detection. Figure 13 (B) shows the case where the touch detection operation is magnetic field touch detection. Figure 13In 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 do not necessarily correspond one to one. In other words, a plurality of drive electrodes arranged adjacent to each other may correspond to the unit drive circuits. Figure 13 , an example is shown in which six driving electrodes correspond to a unit driving circuit. That is, the six driving electrodes TL(n)-1 to TL(n)-6 arranged adjacent to each other are regarded as one driving electrode TL(n) and correspond to the unit driving circuits USR(n) and USL(n).

[0219] In electric field touch detection, if the unit drive circuits USR(n) and USL(n) generate a selection signal for specifying the corresponding drive electrode TL(n), then the designated drive electrode TL(n), i.e., the six drive electrodes TL(n)-1 to TL(n)-6, each of which has one end on the side 2-L( Figure 8 、 Figure 9 ) side, and is connected to the signal wiring TSV. In addition, the other end of each of the designated driving electrodes TL(n), that is, the six driving electrodes TL(n)-1 to TL(n)-6, is connected to the signal wiring TSV on the side 2-R( Figure 8 、 Figure 9 ) side, connected to the signal wiring TSV. During electric field touch detection, a drive signal TSVCOM with a periodically varying voltage is supplied to the signal wiring TSV. Consequently, the drive signal TSVCOM is supplied as an electric field drive signal to both ends of the drive electrode TL(n), that is, the six drive electrodes TL(n)-1 to TL(n)-6. As a result, an electric field is generated based on the electric field drive signal (drive signal TSVCOM).

[0220] On the other hand, during 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-1) and TL(n+1) configured in a manner of clamping the specified drive electrode TL(n), that is, the six drive electrodes TL(n)-1 to TL(n)-6, are connected to the signal wiring TSV and the voltage wiring VCOM. The drive electrode TL(n-1) is composed of six drive electrodes TL(n-1)-1 to TL(n-1)-6, and the drive electrode TL(n+1) is also composed of six drive electrodes TL(n+1)-1 to TL(n+1)-6. Figure 13 In the figure, only driving electrodes TL(n-1)-5, TL(n-1)-6, TL(n+1)-1 and TL(n+1)-2 are shown, and 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 Figure 13 The driving electrodes TL(n-1)-5, TL(n-1)-6, TL(n+1)-1, and TL(n+1)-2 shown are used as examples for explanation. The end of each of the driving electrodes TL(n-1)-5 and TL(n-1)-6 is on the side of the edge 2-L and is connected to the signal wiring TSV. In addition, the end of each of the driving electrodes TL(n+1)-1 and TL(n+1)-2 is on the side of the edge 2-L and is 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 the side of the edge 2-R and is 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 the side of the edge 2-R and is connected to the signal wiring TSV. Similarly, each of the unillustrated drive electrodes TL(n-1)-1 to TL(n-1)-4 has one end connected to the signal wiring TSV on the side of side 2-L, and the other end connected to the voltage wiring VCOM on the side of side 2-R. Furthermore, each of the unillustrated drive electrodes TL(n+1)-3 to TL(n+1)-6 has one end connected to the voltage wiring VCOM on the side of side 2-L, and the other end connected to the signal wiring TSV on the side of side 2-R.

[0222] During the magnetic field generation period TGT of the magnetic field touch detection, the signal wiring TSV is supplied with a driving signal TSVCOM whose voltage changes periodically, and the voltage wiring VCOM is supplied with a ground voltage Vss. Figure 13As shown, of the drive electrodes TL(n-1) and TL(n+1) arranged across the designated drive electrode TL(n), a current indicated by arrow I1 flows through the drive electrode TL(n-1). As indicated by the arrow, a current I2 flows in the opposite direction of current I1 through the drive electrode TL(n+1). In other words, currents flow in opposite directions through the drive electrodes TL(n-1) and TL(n+1) arranged across the designated drive electrode TL(n) in response to voltage changes in the magnetic field drive signal (drive signal TSVCOM). Consequently, in the region where the drive electrode TL(n) is arranged, the magnetic field generated by the drive electrode TL(n-1) and the magnetic field generated by the drive electrode TL(n+1) overlap, 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 together to form drive electrode TL(n-1), strengthening the magnetic field generated at drive electrode TL(n-1). Similarly, the six drive electrodes TL(n+1)-1 to TL(n+1)-6 are bundled together to form drive electrode TL(n+1), further strengthening the magnetic field generated at drive electrode TL(n+1). As a result, the superimposed magnetic fields can be further strengthened.

[0224] This makes it possible to generate a strong magnetic field even without connecting the parallel drive electrodes TL(n-1) and TL(n+1) in series to form a coil. This facilitates control and reduces the area occupied by the control circuit.

[0225] <<Selecting the Drive Circuit Configuration>>

[0226] Figure 14 This is a block diagram showing the configuration of the selection drive circuit SSL and SSR according to Embodiment 1. The selection drive circuit SSL and the selection drive circuit SSR have similar configurations. First, the configuration of the selection drive circuit SSL will be described. The differences between the selection drive circuit SSR and the selection drive circuit SSL will be mainly described.

[0227] Select the drive circuit SSL as Figure 8 As shown, it includes a driving circuit SL-R and a selection circuit SL-C. The driving circuit SL-R includes a plurality of unit driving circuits USL(0) to USL(p) corresponding to the driving electrodes TL(0) to TL(p), and the selection circuit SL-C includes a plurality of third switches and fourth switches corresponding to the driving electrodes TL(0) to TL(p), and a switch control circuit SWL. Figure 14, driving electrodes TL(n) to TL(n+5) of driving electrodes TL(0) to TL(p) are shown, and the portion of the selection driving circuit SSL corresponding to these driving electrodes TL(n) to TL(n+5) is shown. The following description of the selection driving circuit SSL uses the portion corresponding to driving electrodes TL(n) to TL(n+5) as an example.

[0228] In Figure 14 In the figure, USL(n) to USL(n+5) are unit drive circuits corresponding to the drive electrodes TL(n) to TL(n+5). The unit drive circuits USL(n) to USL(n+5) each include a shift segment. The shift segments of each unit drive circuit USL(n) to USL(n+5) are connected in series to form a shift register. During the magnetic field generation period TGT and the electric field touch detection period, selection information SEI is supplied to the unit drive circuit USL(n) from the unit drive circuit USL (not shown) preceding the unit drive circuit USL(n). In synchronization with the clock signal CLK, the selection information SEI is shifted in the shift register formed by the shift segments of the unit drive circuits USL(n) to USL(n+5), moving from the unit drive circuit USL(n) to the unit drive circuit USL(n+5). When the selection information SEI shifts, the unit drive circuits USL(n) to USL(n+5) each output a selection signal to the switch control circuit SWL.

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

[0230] The third switches STLn to STLn+5 and the fourth switches SVLn to SVLn+5 each correspond to drive electrodes TL(n) to TL(n+5). For example, the third switch STLn and the fourth switch SVLn correspond to drive electrode TL(n), while the third switch STLn+5 and the fourth switch SVLn+5 correspond to drive electrode TL(n+5). The remaining third and fourth switches also have a one-to-one correspondence with the drive electrodes.

[0231] The third switches STLn through STLn+5 are each connected between the signal wiring TSV and one end of the corresponding drive electrodes TL(n) through TL(n+5) on the side 2-L of the display panel 2 and are controlled by a first drive signal. Furthermore, the fourth switches SVLn through SVLn+5 are each connected between the voltage wiring VCOM and one end of the corresponding drive electrodes TL(n) through TL(n+5) on the side 2-L of the display panel 2 and are controlled by a second drive signal. For purposes of illustration, the third switches STLn and STLn+5 and the fourth switches SVLn and SVLn+5 are connected between the signal wiring 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 wiring VCOM and one end of the drive electrode TL(n) on the side 2-L. Furthermore, 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 same applies to the remaining third and fourth switches.

[0232] In the first embodiment, the third switches STLn to STLn+5, the fourth switches SVLn to SVLn+5, and the switch control circuit SWL constitute a Figure 8 The selection circuit SL-C is shown.

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

[0234] The shift stages within unit drive circuits USR(n) to USR(n+5) are connected in series, and selection information SEI shifts from unit drive circuit USR(n) to USR(n+5) in synchronization with the clock signal CLK. During this shift, the selection information SEI stored in unit drive circuits USR(n) to USR(n+5) is output to the switch control circuit SWR as the select signal for unit drive circuits USR(n) to USR(n+5). The switch control circuit SWR receives the select signals from the unit drive circuits USR(n) to USR(n+5), the magnetic field enable signal SC_EN, and the electric field enable signal TC_EN to generate a third drive signal for switching control of the fifth switches STRn to STRn+5 and a fourth drive signal for switching control of the sixth switches SVLn to SVLn+5.

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

[0236] Taking the fifth switches STRn and STRn+5 and the sixth switches SVRn and SVRn+5 as examples, 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. Furthermore, 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 and sixth switches.

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

[0238] like Figure 15 As shown, 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 their respective voltage values periodically vary between the ground voltage Vss and a predetermined voltage (first voltage) Vp. Meanwhile, the ground voltage Vss is supplied to the voltage wiring VCOM.

[0239] When electric field touch detection is used, Figure 15 As shown in (A) and (B), drive signals synchronized with each other are also supplied to the signal wiring TSV configured in the selection circuit SL-C and the signal wiring TSV configured in the selection circuit SR-C. Although not particularly limited, the predetermined voltage Vp in the drive signal TSVCOM is different during the magnetic field generation period TGT and during the electric field touch detection. In addition, Figure 15 The periods of the drive signal TSVCOM shown in (A) and (B) are also different during the magnetic field generation period TGT and the electric field touch detection period. Of course, the predetermined voltage Vp and period are not limited to these, and may be the same.

[0240] The switch control circuits SWL and SWR perform different operations when magnetic field touch detection is specified by the magnetic field enable signal SC_EN and when electric field touch detection is specified by the electric field enable signal TC_EN. Figure 16 and Figure 17 , describes the operation when magnetic field touch detection is specified, using Figure 18 , the operation when electric field touch detection is specified is described.

[0241] <<Actions generated by magnetic fields>>

[0242] Figure 16 and Figure 17 It is a schematic plan view showing an operation when magnetic field touch detection is designated.

[0243] When a selection signal supplied from a unit drive circuit indicates selection, the switch control circuit SWL controls the third switch and the fourth switch so that two drive electrodes, arranged with the drive electrode corresponding to the unit drive circuit outputting the selection signal indicating selection interposed therebetween, are connected to the signal wiring TSV and the voltage wiring VCOM. Although not particularly limited, in this first embodiment, the switch control circuit SWL controls the third switch so that the drive electrode closest to the side 2-U of the two drive electrodes is connected to the signal wiring TSV, and the switch control circuit SWL controls the fourth switch so that the drive electrode closest to the side 2-D is connected to the voltage wiring VCOM.

[0244] Similarly, when the select signal supplied from the unit drive circuit indicates selection, the switch control circuit SWR controls the sixth switch and the fifth switch so that the two drive electrodes, which are arranged so as to sandwich the drive electrode corresponding to the unit drive circuit outputting the select signal indicating selection, are connected to the voltage wiring VCOM and the signal wiring TSV. In this first embodiment, the switch control circuit SWR controls the sixth switch so that the drive electrode closest to the side 2-U of the two drive electrodes is connected to the voltage wiring VCOM, and the switch control circuit SWL controls the fifth switch so that the drive electrode closest to the side 2-D is connected to the signal wiring TSV.

[0245] The shift register formed by the unit drive circuits USL(n) to USL(n+5) and the shift register formed by the unit drive circuits USR(n) to USR(n+5) operate in synchronization with each other. Therefore, a drive electrode having one end connected to the signal line TSV via the switch control circuit SWL has its other end connected to the voltage line VCOM via the switch control circuit SWR. Furthermore, a drive electrode having its other end connected to the signal line TSV via the switch control circuit SWR has one end connected to the voltage line VCOM via the switch control circuit SWL.

[0246] exist Figure 16, represents the state when the unit drive circuits USL(n+2) and USR(n+2) output selection signals indicating selection. The drive electrode corresponding to the unit drive circuits USL(n+2) and USR(n+2) is drive electrode TL(n+2). Therefore, the two drive electrodes arranged so as to sandwich this drive electrode TL(n+2) become drive electrode TL(n+1) and drive electrode TL(n+3). The switch control circuit SWL turns on the third switch STLn+1 using a first drive signal, thereby connecting one end of the drive electrode TL(n+1) located near the side 2-U to the signal wiring TSV. At this time, the switch control circuit SWL turns on the fourth switch SVLn+3 using a second drive signal, thereby connecting one end of the drive electrode TL(n+3) located near the side 2-D to the voltage wiring VCOM.

[0247] At this time, the switch control circuit SWL is controlled by the first drive signal so that the remaining third switches STLn, STLn+2 to STLn+5, excluding the third switch STLn+1, are turned off. Similarly, the switch control circuit SWL is controlled by the second drive signal so that the remaining fourth switches SVLn to SVLn+2, SVLn+4 to SVLn+5, excluding the fourth switch SVLn+3, are turned off.

[0248] On the other hand, the switch control circuit SWR turns on the sixth switch SVRn+1 using the fourth drive signal so that the other end of the drive electrode TL(n+1) located near the side 2-U, of the two drive electrodes, is connected to the voltage wiring VCOM. At this time, the switch control circuit SWR turns on the fifth switch STRn+3 using the third drive signal so that the other end of the drive electrode TL(n+3) located near the side 2-D is connected to the signal wiring TSV.

[0249] At this time, the switch control circuit SWR is controlled by the third drive signal so that the remaining fifth switches STRn to STRn+2 and STRn+4 to STRn+5, excluding the fifth switch STRn+3, are turned off. Similarly, the switch control circuit SWR is controlled by the fourth drive signal so that the remaining sixth switches SVRn, SVRn+2 to SVRn+5, excluding the sixth switch SVRn+1, are turned off.

[0250] Thus, one end of the driving electrode TL(n+1), one of the two driving electrodes arranged so as to sandwich the driving electrode TL(n+2), is connected to the signal wiring TSV, and the other end thereof is connected to the voltage wiring VCOM. At this time, one end of the other driving electrode TL(n+3) is connected to the voltage wiring VCOM, and the other end thereof is connected to the signal wiring TSV. Figure 15 As shown, by supplying a driving signal TSVCOM whose voltage value changes periodically to the signal wiring TSV and supplying a ground voltage Vss to the voltage wiring VCOM, a current flows through the driving electrode TL(n+1). Figure 16 A current I1 as indicated by an arrow in FIG. 1 and a current I2 as indicated by an arrow flow through the driving electrode TL(n+3) .

[0251] When the current I1 flows, a magnetic field indicated by a dotted arrow line is generated in the driving electrode TL(n+1). On the other hand, when the current I2 flows in the opposite direction to the current I1 in the driving electrode TL(n+3), a magnetic field indicated by the dotted arrow line is generated in the driving electrode TL(n+3). The driving electrode TL(n+2) is sandwiched between the driving electrodes TL(n+1) and TL(n+3), so a magnetic field is superimposed in the region of the driving electrode TL(n+2). and magnetic field In addition, at this time, the driving electrodes TL(n), TL(n+2), TL(n+4), and TL(n+5) other than the driving electrodes TL(n+1) and TL(n+3) are in a floating state.

[0252] The selection information SEI indicating selection changes with the shift clock CLK, thereby shifting from the unit drive circuits USL(n+2) and USR(n+2) to the unit drive circuits USL(n+3) and USR(n+3). This shift causes the region where a strong magnetic field is generated to shift from the region of the drive electrode TL(n+2) to the region of the drive electrode TL(n+3). Figure 17 This shows a state where a strong magnetic field is generated in the driving electrode TL(n+3).

[0253] As the clock signal CLK changes, the selection information SEI indicating the selection is transferred to the unit drive circuits USL(n+3) and USR(n+3). The drive electrode corresponding to the unit drive circuits USL(n+3) and USR(n+3) is the drive electrode TL(n+3). Therefore, the switch control circuits SWL and SWR connect the drive electrode TL(n+2), which is arranged closer to the side 2-U than the drive electrode TL(n+3), to the signal wiring TSV and the voltage wiring VCOM. In addition, at this time, the switch control circuits SWL and SWR connect the drive electrode TL(n+4), which is arranged closer to the side 2-D than the drive electrode TL(n+3), to the voltage wiring VCOM and the signal wiring TSV. That is, the switch control circuit SWL turns on the third switch STLn+2 through the first drive signal, turns on the fourth switch SVLn+4 through the second drive signal, and turns off the remaining third and fourth switches. Furthermore, the switch control circuit SWR turns on the fifth switch SVRn+2 by the third drive signal, turns on the sixth switch STRn+4 by the fourth drive signal, and turns off the remaining fifth and sixth switches.

[0254] As a result, one end of the driving 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 driving 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 driving signal TSVCOM is supplied to the signal wiring TSV and the ground voltage Vss is supplied to the voltage wiring VCOMDC, then in the driving electrode TL(n+2), Figure 17 A current I1 flows in the direction indicated by the arrow in FIG. 1 , and a current I2 flows in the direction indicated by the arrow in FIG. 1 .

[0255] By flowing the currents I1 and I2, a magnetic field as indicated by the dotted arrow line is generated in the driving electrode TL(n+2). In the driving electrode TL(n+4), a magnetic field is generated as indicated by the dotted arrow line. In the region of the driving electrode TL(n+3), a magnetic field is superimposed. and magnetic field At this time, the driving electrodes TL(n), TL(n+1), TL(n+3), and TL(n+5) other than the driving electrodes TL(n+2) and TL(n+4) are in a floating state.

[0256] As described above, by shifting the selection information SEI indicating selection from unit drive circuits USL(n) and USR(n) to unit drive circuits USL(n+5) and USR(n+5), a magnetic field can be generated sequentially from side 2-U toward side 2-D. In this case, a strong magnetic field can be generated even without connecting drive electrodes to form a magnetic field generating coil.

[0257] <<Actions generated by electric fields>>

[0258] When electric field touch detection is indicated by the electric field enable signal TC_EN, the switch control circuits SWL and SWR control the third and fifth switches to connect the drive electrodes corresponding to the unit drive circuits outputting the selected select signal to the signal traces TSV when the select signal supplied from the unit drive circuit indicates selection. Unlike magnetic field generation, generating an electric field does not require direct current to flow through the drive electrodes, so the switch control circuits SWL and SWR turn off the fourth and sixth switches.

[0259] Figure 18 1 is a schematic plan view showing the operation when electric field touch detection is specified. This figure shows the state when the unit drive circuits USL(n+2) and USR(n+2) output selection signals indicating selection.

[0260] In the switch control circuit SWL, when a selection signal indicating selection is supplied from the unit drive circuit USL(n+2), the first drive signal turns on the third switch STLn+2 connected between one end of the drive electrode TL(n+2) corresponding to the unit drive circuit USL(n+2) and the signal line TSV. Furthermore, the switch control circuit SWL is controlled by the first drive signal to turn off the other third switches STLn to STLn+1 and STLn+3 to STLn+5, excluding the third switch STLn+2.

[0261] In the switch control circuit SWR, when a selection signal indicating selection is supplied from the unit drive circuit USR(n+2), the third drive signal turns on the fifth switch STRn+2 connected between the other end of the drive electrode TL(n+2) corresponding to the unit drive circuit USR(n+2) and the signal line TSV. Furthermore, the switch control circuit SWR is controlled by the third drive signal to turn off the other fifth switches STRn to STRn+1 and STRn+3 to STRn+5, excluding the fifth switch STRn+2.

[0262] The switch control circuits SWL and SWR turn on the fourth switch SVLn+2 and the sixth switch SVRn+2 connected to the driving electrode TL(n+2) generating the electric field, by the second and fourth driving signals.

[0263] During electric field touch detection, a drive signal TSVCOM, whose voltage periodically changes, is also supplied to the signal wiring TSV. Therefore, the drive signal TSVCOM is supplied to one end of the drive electrode TL(n+2) via the third switch STLn+2, and to the other end of the drive electrode TL(n+2) via the fifth switch STRn+2. As a result, the drive signal TSVCOM is supplied to both ends of the drive electrode TL(n+2), generating an electric field in accordance with the drive signal TSVCOM in the drive electrode TL(n+2).

[0264] As the clock signal CLK changes, the selection information SEI indicating the selection is transferred from the unit drive circuits USL(n+2) and USR(n+2) to the unit drive circuits USL(n+3) and USR(n+3). Consequently, the switch control circuit SWL turns on the third switch STLn+3, and the switch control circuit SWR turns on the fifth switch STRn+3. At this point, the third switches other than the third switch STLn+3 and the fifth switches other than the fifth switch STRn+3 are turned off. Consequently, an electric field corresponding to the drive signal TSVCOM is generated in the drive electrode TL(n+3) located adjacent to the drive electrode TL(n+2).

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

[0266] exist Figures 15 to 18 In FIG. 1 , an example is shown in which a third switch, a fourth switch, a fifth switch, and a sixth switch are connected to each driving electrode, but the present invention is not limited thereto. For example, Figure 13 As shown, one third switch, one fourth switch, one fifth switch, and one sixth switch are connected to each of six (or more) driving electrodes arranged adjacent to each other.

[0267] In addition, the third switch, the fourth switch, the fifth switch, and the sixth switch connected to the adjacent drive electrodes may be controlled to switch on and off substantially simultaneously based on the selection information from the same unit drive circuit. Figure 16In the embodiment of the present invention, 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) may be turned on substantially simultaneously based on a selection signal from the unit drive circuit USL(n+2), and 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) may be turned on substantially simultaneously based on a selection signal from the unit drive circuit USR(n+2). In this way, the drive electrodes TL(n) and TL(n+1) can be bundled together to generate a magnetic field, thereby strengthening the generated magnetic field.

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

[0269] For example, it is possible to target Figure 36 and Figure 37 The configuration shown in FIG1 reduces the number of switches in the configuration of the first embodiment. Therefore, control becomes easier and an increase in occupied area can be suppressed.

[0270] <Configuration of Switching Adjustment Circuit>

[0271] Figure 19 FIG. 1 is a plan view showing the structure of the display device 1 according to the first embodiment. Figure 19 In the , it indicates the state of magnetic field touch detection. Figures 14 to 17 As described in the magnetic field touch detection, during the magnetic field generation period TGT, the driving electrodes are used to generate the magnetic field. Figure 1 and Figure 2 As described in the preceding text, the amount of charge stored in the capacitive element C within the pen changes depending on whether the pen is approaching. During the magnetic field detection period TDT, the magnetic field generated by the coil L1 within the pen is detected based on the amount of charge stored in the capacitive element C within the pen.

[0272] exist Figure 1 and Figure 2 In the embodiment, the magnetic field generating coil and the magnetic field detecting coil are constituted by the same coil as an example. Figures 14 to 17 It is explained that in the magnetic field generation period TGT, a magnetic field is generated without using a coil (magnetic field generating coil), and the magnetic field from the pen is detected by the magnetic field detection coil.

[0273] In the first embodiment, a signal line is used to form a magnetic field detection coil during the magnetic field detection period TDT.

[0274] exist Figure 19 In the figure, the driving electrodes used to generate the magnetic field during the magnetic field generation period TGT are omitted, and only the signal lines that constitute the magnetic field detection coils are depicted during the magnetic field detection period TDT. During the magnetic field detection period TDT, the signal lines are used to detect the magnetic field and can therefore be considered as detection electrodes. Figure 19 In the figure, only the detection electrodes are described.

[0275] exist Figure 19 In the case of the coil L1 in the pen, a magnetic field is generated based on the charge of the capacitor C which is charged by the voltage induced by the magnetic field during the magnetic field generation period TGT. Figure 19 In the figure, SL(0) to SL(p) represent signal lines. Figure 10 As shown in , the signal lines SL(0) to SL(p) intersect with the driving electrodes TL(0) to TL(p). That is, the signal lines SL(0) to SL(p) are arranged parallel to each other between the side 2-R and the side 2-L of the display panel 2.

[0276] Although not particularly limited, in this first embodiment, a magnetic field signal line SL(dL) is arranged along the side 2-L of the display panel 2, and a magnetic field signal line SL(dR) is arranged along the side 2-R of the display panel 2. That is, it includes: a magnetic field signal line SL(dR) (second signal line) that is outside the active area of the display panel 2 and arranged along the side 2-R in parallel with the signal lines SL(0) to SL(p) (first signal line); and a magnetic field signal line SL(dL) (second signal line) that is outside the active area of the display panel 2 and arranged along the side 2-R in parallel with the signal lines SL(0) to SL(p). The magnetic field signal lines SL(dR) and SL(dL) are outside the active area of the display panel 2 and therefore do not contribute to display, but are used for magnetic field touch detection.

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

[0278] Although not particularly limited, the signal lines SL(0) to SL(p) are arranged in this order from the side 2-L to the side 2-R of the display panel 2. In the first embodiment, during the magnetic field detection period TDT, the signal lines arranged with two signal lines in between are connected via the eighth switches k00 to kp. Figure 19 For example, 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] Moreover, 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 ends of the magnetic field signal line SL(dL) and the signal line SL(2), and the seventh switch j01 is connected between the ends of the magnetic field signal line SL(dR) and the signal line SL(p-2).

[0281] The seventh switches j00, j01 and the eighth switches k00-kp are respectively switched on and off by the magnetic field enable signal SC_EN. In this embodiment, the seventh switches j00, j01 and the eighth switches k00-kp are turned on when the magnetic field enable signal SC_EN specifies magnetic field touch detection, and are turned off otherwise.

[0282] As a result, when the magnetic field touch detection is performed, the signal lines with two signal lines in between are electrically connected. Figure 19For example, the signal lines SL(1) and SL(4) arranged across the signal lines SL(2) and SL(3) are electrically connected via the eighth switch k00. Similarly, the signal lines SL(3) and SL(6) arranged across the signal lines SL(4) and SL(5) are connected via the eighth switch k01. The signal lines SL(n-2) and SL(n+1) arranged across the signal lines SL(n-1) and SL(n) are connected via the eighth switch kn-1. The signal lines SL(n) and SL(n+3) arranged across the signal lines SL(n+1) and SL(n+2) are connected via the eighth switch kn. The signal lines SL(n+2) and SL(n+5) arranged across the signal lines SL(n+3) and SL(+4) are connected via the eighth switch kn+1.

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

[0284] In this embodiment 1, the magnetic field signal line SL(dL) configured in a manner separated by the signal lines SL(0) and SL(1) is connected to the signal line SL(2) via the seventh switch j00, and the magnetic field signal line SL(dR) configured in a manner separated by the signal lines SL(p-1) and SL(p) is connected to the signal line SL(p-2) via the seventh switch j01.

[0285] Thus, during the magnetic field detection period TDT, a magnetic field detection coil is formed by any plurality of signal lines among the signal lines SL(0) to SL(p). In the first embodiment, a magnetic field detection coil can also be formed near the sides 2-R and 2-L of the display panel 2 during the magnetic field detection period TDT. That is, the magnetic field signal line SL(dL) and the signal line SL(2) can be made into a winding, and a magnetic field detection coil with the signal lines SL(0) and SL(1) arranged close to the side 2-L of the display panel 2 as the inner side is formed. Similarly, the magnetic field signal line SL(dR) and the signal line SL(p-2) can be made into a winding, and a magnetic field detection coil with the signal lines SL(p-1) and SL(p) arranged close to the side 2-R of the display panel 2 as the inner side is formed. Thus, even when the pen is close to the sides 2-R and 2-L, detection is possible. In addition, in the first embodiment, as shown in FIG. Figure 19 It is understood that the magnetic field detection coils are formed to overlap each other. This can prevent detection leakage.

[0286] The widths d8 and d10 of the magnetic field signal lines SL(dR) and SL(dL) are narrower than the widths d9 and d10 of the signal lines SL(0) to SL(p), thereby preventing the frame from becoming larger.

[0287] During the magnetic field detection period TDT, a ground voltage Vss is supplied to one terminal of a pair of terminals of each magnetic field detection coil formed by the signal line, and the other terminal is connected to the ground voltage Vss. Figure 8 The amplifier circuit AMP described in the connection. Figure 19 For the sake of example, the ends of signal lines SL(n-2), SL(n), and SL(n+2) are connected to amplifier circuit AMP. When 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, causing the input signal to amplifier circuit AMP to change. Amplifier circuit AMP amplifies this change in input signal and outputs it as sensor signals S(0) to 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 turned off. Figure 14 as well as Figure 18 As described in the figure, the driving electrode generates an electric field. Depending on whether a finger touches the signal line, the electric field changes, and this change is transmitted to the amplifier circuit AMP, amplified, and output as sensor signals S(0) to S(p).

[0289] In the first embodiment, the magnetic field signal lines SL(dR) and SL(dL) serving as windings when forming the magnetic field detection coil are provided along two sides of the display panel 2 , but they may be provided on either side.

[0290] Figure 20 This is a perspective view schematically showing the structure of the display device 1 according to the first embodiment. In this figure, the driving electrodes TL(0) to TL(p), the signal lines SL(0) to SL(p), the eighth switches k00 to kp, the driving semiconductor device DDIC, the selection driving circuits SSR and SSL, and the gate driver 5 are shown. These are formed on the TFT glass substrate TGB. Therefore, it can also be considered that Figure 20 In FIG, the display device 1 installed in the module is shown. In addition, in Figure 20 , a pen including a coil L1 is also shown.

[0291] Along module side 900-R, a selection drive circuit SSR is arranged. Along side 900-L, a selection drive circuit SSL and gate driver 5 are arranged. Signal lines SL(0)-SL(p) are arranged parallel to each other between selection drive circuit SSL and selection drive circuit SSR. Eighth switches k00-kp are arranged along module side 900-U. Drive electrodes TL(0)-TL(p) are arranged perpendicular to signal lines SL(0)-SL(p) and parallel to each other.

[0292] The eighth switches k00-kp are as shown in Figure 19 In the description, when touch detection is performed, the signal lines are connected. Figure 20 In the embodiment, ninth switches 100 - 1p formed in the TFT glass substrate TGB are arranged along the side 900 -D of the module.

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

[0294] When electric field touch detection is performed, the ninth switch of the second group is also turned on, and the change of the signal in the signal line is supplied to the amplifier circuit AMP for amplification, and is supplied as the sensing signal S(0) to S(p) to the semiconductor device 6 for touch detection ( Figure 8 ).

[0295] In the first embodiment, the ninth switches 100 to 1p are formed on the TFT glass substrate, and the driving semiconductor device DDIC is arranged so as to cover the ninth switches 100 to 1p. This can suppress the expansion of the frame.

[0296] Although not particularly limited, signal wiring TSV and voltage wiring VCOM extend along module sides 900-R and 900-L. During the magnetic field generation period TGT, the signal wiring TSV is supplied with a drive signal TSVCOM, and the voltage wiring VCOM is supplied with a ground voltage Vss. Furthermore, during electric field touch detection, the signal wiring TSV is supplied with a 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 in the direction indicated by the arrow flows through the drive electrodes TL(n-1) and TL(n). In addition, at this time, by selecting the drive circuits SSL and SSR, a current I2 in the direction indicated by the arrow flows through the drive electrodes TL(n+3) and TL(n+4). As a result, the drive signal TSVCOM changes periodically, thereby generating a periodically changing magnetic field in the drive electrodes TL(n-1), TL(n), TL(n+3) and TL(n+4). Figure 20 The generated magnetic field is schematically represented by a dotted line. In the region of the driving electrodes TL(n-1), TL(n), TL(n+3), and TL(n+4), a superimposed magnetic field is formed. and Generates a strong magnetic field.

[0298] If a pen is present near a region generating a strong magnetic field, the coils L1 in the pen generate an induced voltage due to mutual induction, and the generated induced voltage charges a capacitive element C (not shown) in the pen PN.

[0299] The coil L1 in the pen generates a magnetic field during the magnetic field detection period TDT by the charge stored in the capacitor C. Figure 20 The magnetic lines of force at this time are expressed as

[0300] During the magnetic field detection period TDT, as in Figure 19In the figure, the eighth switches k00 to kp are turned on. Thus, a plurality of coils are formed so that the signal lines SL(0) to SL(p) are wound. By the mutual induction between the coils that make the signal lines wound and the coil L1 inside the pen, an induced voltage is generated in the coils that make the signal lines wound, and the signal in the signal lines is transmitted to the ninth switch of the second group. By turning on the ninth switch of the second group, the sensing signals S(0) to S(p) are output from the amplifier circuit AMP. Figure 20 In FIG, a solid line with an arrow indicates a signal transmitted to the ninth switch ln via the signal line SL(n). Thus, when the driving electrode generating the magnetic field is driven, the coordinates touched by the pen can be determined by identifying the detection electrode that detects the magnetic field.

[0301] While the example of configuring the magnetic field signal lines SL(dL) and SL(dR) outside the active area of the display panel 2 has been described, the present invention is not limited to this. For example, the magnetic field signal lines SL(dL) and / or the magnetic field signal lines SL(dR) may be configured along the sides 2-L and 2-R, respectively, within the active area of the display panel 2. In this case, the width d10 of the configured magnetic field signal lines SL(dL) and / or SL(dR) can be made narrower than the width d11 of the signal lines, thereby reducing the narrowing of the display area.

[0302] <Modification>

[0303] Figure 21 It is a perspective view schematically showing a display device 1 according to a modified example of the first embodiment. Figure 21 and Figure 20 Similar, so the main description is Figure 20 The difference. Figure 20 In the display device 1 shown, when a magnetic field touch is detected, a magnetic field detection coil is formed through the signal lines SL(0) to SL(p). In addition, when an electric field touch is detected, the signal lines SL(0) to SL(p) are also used to detect changes in the electric field. In contrast, in a modified example, the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB are used to form a magnetic field detection coil when a magnetic field touch is detected. In addition, even when an electric field touch is detected, the detection electrodes RL(0) to RL(p) are used to detect changes in the electric field. That is, instead of Figure 20 The signal lines SL(0) to SL(p) are shown, and during magnetic field touch detection and electric field touch detection, the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB are used.

[0304] The detection electrodes RL(0)~RL(p) are as follows Figure 4As shown, the detection electrodes RL(0) to RL(p) are formed on the main surface CSF1 of the CF glass substrate CGB. Therefore, the detection electrodes RL(0) to RL(p) are formed on the drive electrodes TL(0) to TL(p) via the liquid crystal layer, color filter, and CF glass substrate CGB. When viewed from above from the main surface CSF1 of the CF glass substrate CGB, the drive and detection electrodes RL(0) to RL(p) are arranged parallel to each other and perpendicular to the electrodes TL(0) to TL(p).

[0305] exist Figure 21 In this modification, the ends of one side of the detection electrodes RL(0) to RL(p) are connected to each other at a predetermined interval. Figure 20 The signal lines SL(0) to SL(p) shown in the figure are similarly connected to the ends of the detection electrodes RL(0) to RL(p) with a spacing such that two detection electrodes are interposed in between. This connection is achieved by connecting the detection electrodes with signal wiring formed in the CF glass substrate CGB. Figure 21 In order to make the drawings easier to understand, only the detection electrodes RL(0) to RL(6), RL(n), RL(n+3), and RL(p-3) to RL(p) among the detection electrodes RL(0) to RL(p) are marked with reference numerals. Figure 21 For example, on the module side 900-U, the ends of the detection electrodes RL(1) and RL(4) are connected. Furthermore, the ends of the detection electrodes RL(3) and RL(6) are connected. It should be noted that the end of the detection electrode RL(2) is connected to the end of the detection electrode RL(0) closest to the module side 900-L, sandwiching one detection electrode TL(1). With the exception of the detection electrode RL(p-3), the ends of the other detection electrodes are also connected with two detection electrodes in between.

[0306] The other end of each of the detection electrodes RL(0) to RL(p) is connected to the ninth switches 100 to 1p formed in the TFT glass substrate TGB. Figure 21 In order to show the connection between the detection electrodes RL(0) to RL(p) and the ninth switches 100 to 1p, the ninth switches 100 to 1p are drawn on the CF glass substrate CGB. Figure 20 Similarly, the ninth switches 100-1p are formed on the TFT glass substrate TGB. Figure 20 The example shown in FIG is similarly covered by the driving semiconductor device DDIC. Figure 21 In FIG. 1 , the driving semiconductor device DDIC is indicated by a dotted line in the TFT glass substrate TGB.

[0307] Figure 21 The ninth switch l00~lp shown is connected to Figure 20 The ninth switches l00 to lp shown are similarly formed by the first and second groups. During the magnetic field detection period TDT, the ninth switches of the first group are turned on, thereby supplying the ground voltage Vss to the ends of the magnetic field detection coil formed by the detection electrodes RL(0) to RL(p). The ninth switches of the second group are turned on, thereby connecting the ends of the magnetic field detection coil to the amplifier circuit AMP.

[0308] In this modification, also during the magnetic field generation period TGT, Figure 20 Similarly, by driving the electrodes TL(0) to TL(p), a magnetic field is generated. If the pen generates a 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) to RL(p). The amplifier circuit AMP outputs the sensing signals S(0) to S(p). Therefore, when the driving electrodes generating the magnetic field are driven, the coordinates touched by the pen can be determined by identifying the detection electrodes that detect the magnetic field.

[0309] When electric field touch detection is performed, Figure 20 Similarly, an electric field is generated by driving electrodes TL(0) to TL(p), and the changes in the electric field caused by whether a finger touches are transmitted to the amplifier circuit AMP through the detection electrodes RL(0) to RL(p) and output as sensor signals S(0) to S(p).

[0310] The signal lines SL(0) to SL(p) are used to transmit image information during the display period, and therefore are required to be electrically isolated from each other during the display period. Figure 19 as well as Figure 20 In the display device 1 shown in FIG. 1 , a seventh switch and an eighth switch are provided. Figure 21 In the modified example shown, signal lines SL(0)-SL(p) are not used, but detection electrodes RL(0)-RL(p) are used instead to perform both magnetic field touch detection and electric field touch detection. Therefore, the seventh and eighth switches can be omitted for magnetic field touch detection, which can reduce the increase in occupied area.

[0311] In the first embodiment, since it is not necessary to form a magnetic field generating coil, control becomes easy and an increase in the area occupied by the control circuit can be suppressed.

[0312] (Implementation Method 2)

[0313] Figure 221 is a plan view showing the structure of the display device 1 according to the second embodiment. Figure 22 , only the portion related to the display panel 2 described in the first embodiment is shown, and the other portions are omitted.

[0314] exist Figure 22 In the figure, TL(0) to TL(p) represent drive electrodes arranged parallel to each other between side 2-U and side 2-D of the display panel 2. Furthermore, TL(dLU) represents a dummy drive electrode for generating a magnetic field, arranged in an area (inactive area) outside the display panel 2 and along side 2-U, and TL(dLD) represents a dummy drive electrode for generating a magnetic field, arranged in an area (inactive area) outside the display panel 2 and along side 2-D. Because the dummy drive electrodes for generating a magnetic field are arranged in the area outside the display panel 2, they are hereinafter referred to as external area drive electrodes.

[0315] In addition, Figure 22 In , USL(0)~USL(p) and USR(0)~USR(p) represent unit drive circuits respectively. Figure 14 、 Figure 16 and Figure 17 As described in the figure, the unit drive circuits USL(0) to USL(p) are arranged along the side 2-L of the display panel 2, corresponding to the drive electrodes TL(0) to TL(p). In addition, the unit drive circuits USR(0) to USR(p) are arranged along the side 2-R of the display panel 2, corresponding to the drive electrodes TL(0) to TL(p).

[0316] As described in the first embodiment, during the magnetic field generation period TGT, the drive signal TSVCOM is supplied to two drive electrodes arranged so as to sandwich the drive electrodes corresponding to the unit drive circuits that output the selection signal for the designated selection. For example, if during the magnetic field generation period TGT, the unit drive circuits USL(2) and USR(2) output the selection signal for the designated selection, the drive signal TSVCOM is supplied to the drive electrodes TL(1) and TL(3) arranged so as to sandwich the drive electrode TL(2) corresponding to these unit drive circuits USL(2) and USR(2). That is, the drive signal TSVCOM is supplied to one end of the drive electrode TL(1) from the side 2-L, and the ground voltage Vss is supplied to the other end of the drive electrode TL(1) from the side 2-R. At this time, the drive signal TSVCOM is supplied to the other end of the drive electrode TL(3) from the side 2-R, and the ground voltage Vss is supplied to one end of the drive electrode TL(3) from the side 2-L. 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 drive electrode TL(0) is selected and positioned close to side 2-U of display panel 2, the drive electrodes close to this drive electrode TL(0) become only drive electrode TL(1). Therefore, when drive electrode TL(0) is selected, the magnetic field generated in drive electrode TL(0) becomes weaker. Similarly, when drive electrode TL(p) is selected and positioned close to side 2-D of display panel 2, the drive electrodes close to this drive electrode TL(p) become only drive electrode TL(p-1). Therefore, when drive electrode TL(p) is selected, the magnetic field generated in drive electrode TL(p) becomes weaker.

[0318] In the second embodiment, the outer-area drive electrode TL(dLU) is arranged on the opposite side of the drive electrode TL(0) across the side 2-U, and the outer-area drive electrode TL(dLD) is arranged on the opposite side of the drive electrode TL(p) across the side 2-D.

[0319] When a magnetic field is generated in drive electrode TL(0), magnetic fields are generated in drive electrode TL(1) and the outer-region drive electrode TL(dLU), which are arranged across drive electrode TL(0). Furthermore, when a magnetic field is generated in drive electrode TL(p), magnetic fields are generated in drive electrode TL(p-1) and the outer-region drive electrode TL(dLD), which are arranged across drive electrode TL(p). This prevents a decrease in pen detection accuracy in areas near sides 2-U and 2-D of display panel 2.

[0320] It should be noted that the outer region driving electrodes TL(dLU) and TL(dLD) are used only to generate a magnetic field, and therefore their line widths dLU and dLD may be narrower than the line width dd of the driving electrodes TL(0) to TL(p).

[0321] Figure 23 This is a top view showing the state of generating a magnetic field in the driving electrode TL(0). During the magnetic field generation period TGT, when the unit driving circuits USL(0) and USR(0) corresponding to the driving electrode TL(0) output a selection signal indicating selection, the selection circuit SL-C( is configured in such a manner that the driving signal TSVCOM is supplied to one end of the external region driving electrode TL(dLU) on the side 2-L and the ground voltage Vss is supplied to one end of the driving electrode TL(1) on the side 2-L in response to the selection signal from the unit driving circuit USL(0). Figure 8 as well as Figure 14 In addition, in response to the selection signal from the unit driving circuit USR (0) at this time, the selection circuit SR-C ( Figure 8 and Figure 14 ).

[0322] Thus, when the drive electrode TL(0) positioned closest to the side 2-U is selected, a current I2 indicated by the arrow flows through the drive electrode TL(1), generating a magnetic field. Furthermore, a current I1 indicated by the arrow flows through the outer region drive electrode TL(dLU), generating a magnetic field. The magnetic field generated by the drive electrode TL(1) and the magnetic field generated by the outer region drive electrode TL(dLU) overlap in the region of the drive electrode TL(0), generating a strong magnetic field in the region of the drive electrode TL(0).

[0323] Figure 24 This is a top view showing the state of generating 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 a selection signal indicating selection, the selection circuit SL-C( is configured in such a way that the ground voltage Vss is supplied to one end of the external region driving electrode TL(dLU) on the side 2-L and the driving signal TSVCOM is supplied to one end of the driving electrode TL(p-1) on the side 2-L in response to the selection signal from the unit driving circuit USL(p). Figure 8 as well as Figure 14In addition, in response to the selection signal from the unit driving circuit USR(p) at this time, the selection circuit SR-C is configured so that the driving signal TSVCOM is supplied to the other end of the external area driving electrode TL(dLU) on the side 2-R, and the ground voltage Vss is supplied to the other end of the driving electrode TL(p-1) on the side 2-R. Figure 8 as well as Figure 14 ).

[0324] Thus, when drive electrode TL(0) is selected, positioned closest to side 2-D, current I1, as indicated by the arrow, flows through drive electrode TL(p-1), generating a magnetic field. Furthermore, current I2, as indicated by the arrow, flows through the outer region drive electrode TL(dLD), generating a magnetic field. In the region of drive electrode TL(p), the magnetic field generated by drive electrode TL(p-1) and the magnetic field generated by the outer region drive electrode TL(dLD) overlap, generating a strong magnetic field in the region of drive electrode TL(p).

[0325] During the magnetic field generation period TGT, the example of supplying the drive signal TSVCOM and the ground voltage Vss to two drive electrodes arranged so as to sandwich the drive electrodes corresponding to the unit drive circuit that outputs the selection signal indicating selection has been described, but the present invention is not limited to this. For example, two drive electrodes arranged so as to sandwich the drive electrodes corresponding to the region generating a strong magnetic field may be selected by the corresponding unit selection circuit. In this case, Figures 22 to 24 As shown, unit drive circuits USL(dU) and USR(dU) are arranged at both ends of the outer area drive electrode TL(dLU), and unit drive circuits USL(dD) and USR(dD) are arranged at both ends of the outer area drive electrode TL(dLD).

[0326] In this case, during the magnetic field generation period TGT, two unit drive circuits among the unit drive circuits USL(0) to USL(p), USL(dL), and USL(dD) that are arranged so as to sandwich the unit drive circuit corresponding to the drive electrode generating the strong magnetic field output a selection signal indicating selection. Similarly, two unit drive circuits among the unit drive circuits USR(0) to USR(p), USR(dL), and USR(dD) that are arranged so as to sandwich the unit drive circuit corresponding to the drive electrode generating the strong magnetic field output a selection signal indicating selection.

[0327] For example, when a strong magnetic field is generated in the region of the driving electrode TL (2), the unit driving circuit USL (1) and the unit driving circuit USL (3) arranged so as to sandwich the unit selection circuit USL (2) output a selection signal indicating selection. The selection circuit SL-C ( Figure 8、 Figure 14 ) According to the selection signals from the unit selection circuits USL(1) and USL(3), a drive signal TSVCOM is supplied to the end of one side of the drive electrode TL(1) corresponding to the unit selection circuit USL(1), and a ground voltage Vss is supplied to the end of one side of the drive electrode TL(3) corresponding to the unit selection circuit USL(3).

[0328] At this time, the unit drive circuit USR(1) and the unit drive circuit USR(3) configured in such a manner as to sandwich the unit selection circuit USR(2) corresponding to the drive electrode TL(2) output a selection signal indicating selection. The selection circuit SR-C( Figure 8 、 Figure 14 ) Based on the selection signals from the unit selection circuits USR(1) and USR(3), the ground voltage Vss is supplied to the other end of the driving electrode TL(1) corresponding to the unit selection circuit USR(1), and the driving signal TSVCOM is supplied to the other end of the driving electrode TL(3) corresponding to the unit selection circuit USR(3). As a result, the magnetic field generated by the driving electrode TL(1) and the magnetic field generated by the driving electrode TL(3) overlap in the region of the driving electrode TL(2).

[0329] When a strong magnetic field is generated in the driving 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 to this, the selection circuit SL-C supplies the drive signal TSVCOM to one end of the external region drive electrode TL(dLU) and supplies the ground voltage Vss to one end of the drive electrode TL(1). In addition, the selection circuit SR-C supplies the ground voltage Vss to the other end of the external region drive electrode TL(dLU) and supplies the drive signal TSVCOM to the other end of the drive electrode TL(1). Thus, in Figure 23 In the embodiment, currents I1 and I2 indicated by arrows flow, thereby generating a magnetic field, and a strong magnetic field can be generated in the region of the driving electrode TL(0).

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

[0331] Of course, the external-area driving electrodes may be arranged only on one side of the display panel 2 .

[0332] In the second embodiment, it is possible to reduce the area where the detection accuracy is reduced in the area where display is performed (the area of the display panel 2 ).

[0333] (Implementation Method 3)

[0334] In the display device 1, while displaying on the display panel 2, it detects whether an external proximate object, such as a pen or finger, has touched an area within the display panel 2. In this third embodiment, the display panel 2 performs a multi-stage detection process within a single frame period during which display is performed, thereby detecting whether an external proximate object has touched an area within the display panel 2. Here, an example of detecting a touch of an external proximate object by performing a two-stage detection process within a single frame period will be described.

[0335] The two-stage detection step includes a first-stage detection step and a second-stage detection step performed after the first-stage detection step. In the first-stage detection step, a rough detection is performed to determine whether an object, such as a pen, that can be detected by magnetic field touch detection, is touching an area of the display panel 2 as an external proximity object. In the first-stage detection step, if it is detected that the pen, as an external proximity object, is touching an area of the display panel 2, a detailed magnetic field touch detection is performed to detect the coordinates, distance, etc. of the touch. On the other hand, in the first-stage detection step, if no touch is detected using the pen, electric field touch detection is performed. This detailed magnetic field touch detection or electric field touch detection becomes the second-stage detection step. As a result, during the period of one frame of display, a touch can be detected regardless of whether a pen or a finger touches an area of the display panel 2.

[0336] Although not particularly limited, the touch detection semiconductor device 6 ( Figure 8) and driving semiconductor device DDIC( Figure 8 ), implementing this two-stage detection process. Specifically, the control circuit T-CNT within the touch detection semiconductor device 6 divides a single frame period into a first period and a second period following the first. During the first period, magnetic field touch detection is instructed by the magnetic field enable signal SC_EN. Furthermore, during this first period, the selection drive circuits SSL and SSR are controlled by the control signal Y-CNT to roughly perform magnetic field touch detection. During this first period, the touch detection semiconductor device 6 notifies the control circuit D-CNT within the drive semiconductor device DDIC via the control signal SW whether a pen touch has been detected. During the first period, the selection drive circuits SSL and SSR are controlled by the control signal Y-CNT to roughly perform magnetic field touch detection.

[0337] If a pen touch is detected during the magnetic field touch detection step of the first phase, control circuit D-CNT within driving semiconductor device DDIC also instructs magnetic field touch detection during the second period using magnetic field enable signal SC_EN. In this case, control signal Y-CNT controls drive circuits SSL and SSR during the second period, enabling detailed magnetic field touch detection. Thus, pen touch is detected during the second period.

[0338] On the other hand, if a pen touch is not detected during the magnetic field touch detection in the first phase of the detection step, the control circuit D-CNT within the driving semiconductor device DDIC instructs electric field touch detection via the electric field enable signal TC_EN during the second period. Consequently, electric field touch detection is performed during the second period to detect a finger touch.

[0339] While the example in which the driving semiconductor device DDIC performs a two-stage detection process based on the control signal SW from the touch detection semiconductor device 6 has been described, the present invention is not limited to this. For example, the touch detection semiconductor device 6 may also control the two-stage detection process, with the control signal SW outputting the magnetic field enable signal SC_EN and the electric field enable signal TC_EN from the driving semiconductor device DDIC.

[0340] The difference between coarse magnetic field touch detection and fine magnetic field touch detection lies in the difference in the number of drive electrodes spaced between the drive electrodes to which the drive signal is supplied during the magnetic field generation period TGT. That is, during the magnetic field generation period TGT, the number of drive electrodes spaced between the drive electrodes is greater in coarse magnetic field touch detection than in fine magnetic field touch detection. For example, in coarse magnetic field touch detection, the drive signal TSVCOM is supplied to a pair of drive electrodes spaced 32 apart, as described in Embodiments 1 and 2. In contrast, in fine magnetic field touch detection, the drive signal TSVCOM is supplied to a pair of drive electrodes spaced less than 32 and equal to or greater than one drive electrode, as described in Embodiments 1 and 2.

[0341] If the number of drive electrodes supplied with the drive signal TSVCOM is the same in both coarse and fine magnetic field touch detection, coarse magnetic field touch detection can detect a pen touch in the entire area of display panel 2 in a short period of time. On the other hand, in fine magnetic field touch detection, the distance between the pair of drive electrodes supplied with the drive signal is shortened, thereby 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] In addition, during rough touch detection, the number of driving electrodes supplied with driving signals may be increased to enhance the generated magnetic field. Figure 13 As described in (B), a pair of driving electrodes to which the driving signal TSVCOM is supplied is formed into a bundle consisting of a plurality of driving electrodes.

[0343] If a touch with a pen is not detected during the first period, electric field touch detection is performed in the second period to detect a touch with a finger. Therefore, a touch with a finger can also be detected.

[0344] During the first and second periods, touch detection is performed on the entire area of display panel 2. Therefore, it can be considered that touch detection is performed twice on the entire area of display panel 2 during one frame period. In this case, 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 is a timing chart showing the operation of the display device 1 according to the third embodiment. Figure 25 , the horizontal axis represents time t. Figure 25(A) is a timing diagram showing a frame signal F. The driving semiconductor device DDIC displays on the display panel 2 based on the frame signal F. That is, the driving semiconductor device DDIC displays on the entire area of the display panel 2 during one cycle TF of the frame signal F. In other words, one screen is displayed during one frame period (TF).

[0346] Figure 25 (B) is a timing diagram showing one cycle (one frame period) TF of the periodic frame signal F. Figure 25 In (B), TF1 represents a first period starting in response to a frame signal F, and TF2 represents a second period following the first period TF1. When displaying in the display device 1, the display device 1 repeats Figure 25 The frame period TF shown in (B) of FIG. 1 , therefore, the first periods TF1 and TF2 are also generated alternately according to this order.

[0347] Figure 25 (C) is a timing diagram schematically showing the display period and the touch detection period. Figure 25 In (C), the periods DPS1 to DPSp filled with oblique lines represent display periods. Figure 25 In (C), to avoid complication in the drawing, reference numerals are assigned to only DPS1, DPS2, DPSn to DPSn+2, and DPSp regarding the display periods. During the display periods DPS1 to DPSp, image information is supplied from the driving semiconductor device DDIC to the signal lines, causing the scanning lines to go high, thereby displaying the image information on the display panel 2. During the display periods DPS1 to DPSp, display is performed, thereby displaying a single screen.

[0348] In Figure 25 In (C), CSS11 to CSS1p and CSS21 to CSS2p represent touch detection periods. Here, CSS11 to CSS1p represent touch detection periods performed during the first period TF1, and CSS21 to CSS2p represent touch detection periods performed during the second period TF2. During touch detection periods CSS11 to CSS1p, coarse magnetic field touch detection is performed, while during touch detection periods CSS11 to CSS1p, magnetic field touch detection is performed, respectively. This allows pen touch detection to be detected across the entire area of the display panel 2.

[0349] In each of the touch detection periods CSS21 to CSS2p, detailed magnetic field touch detection or electric field touch detection is performed. In each of the touch detection periods CSS21 to CSS2p, touch detection is performed to detect a touch performed by a pen or a finger on the entire area of the display panel 2 .

[0350] By performing coarse magnetic field touch detection in each of the touch detection periods CSS11 to CSS1p, touches can be detected across the entire area of the display panel 2 with a reduced number of touches. Consequently, touch detection across the entire area is completed at time tp, before the display of a single screen is complete. This ensures sufficient time to perform touch detection across the entire area of the display panel 2 before the display of a single screen is complete. As a result, touch detection across the entire area is performed again from time tp during the touch detection periods CSS21 to CSS2p.

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

[0352] For the driving signals TL(n)~TL(n+5), Figure 8 The selection drive circuit SSL and SSR shown in the figure provide the drive signal. Figure 25 (D)~ Figure 25 In (I), the left side shows the driving signal supplied to the driving electrodes TL(n) to TL(n+5) during the touch detection period CSS12, and the right side shows the driving signal supplied to the driving electrodes TL(n) to TL(n+5) during the touch detection period CSS24.

[0353] During touch detection period CSS12, for example, the selection drive circuit SSL supplies a drive signal TSVCOM to one end of drive electrode TL(n), and a ground voltage Vss to one end of drive electrode TL(n+5). At this time, the selection drive circuit SSR supplies a ground voltage Vss to the other end of drive electrode TL(n), and a drive signal TSVCOM to the other end of drive electrode TL(n+5). This generates magnetic fields in drive electrode TL(n) and drive electrode TL(n+5). These generated magnetic fields overlap in the region of drive electrodes TL(n+1) to TL(n+4) sandwiched between drive electrode TL(n) and drive electrode TL(n+5).

[0354] On the other hand, during the touch detection period CSS24, for example, the drive signal TSVCOM is supplied from the selection drive circuit SSL to one end of the drive electrode TL(n), and the ground voltage Vss is supplied to one end 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 of the drive electrode TL(n), and the drive signal TSVCOM is supplied to the other end of the drive electrode TL(n+2). As a result, magnetic fields are generated in the drive electrode TL(n) and the drive electrode TL(n+2). The generated magnetic fields overlap in the region of the drive electrode TL(n+1) separated by the drive electrode TL(n) and the drive electrode TL(n+2). Since the drive electrodes supplied with the drive signal TSVCOM are separated only by the drive electrode TL(n+1), the distance between the drive electrodes is shortened, and the magnetic field obtained by the overlapping magnetic fields becomes stronger. As a result, detection accuracy can be improved.

[0355] Furthermore, during touch detection period CSS12, the selection drive circuit SSL may supply drive signals TSVCOM to drive electrodes TL(n) and TL(n+1), and the selection drive circuit SSR may supply drive signals TSVCOM to drive electrodes TL(n+4) and TL(n+5). Specifically, during coarse magnetic field touch detection, two (or more) drive electrodes may be bundled and supplied with the drive signal TSVCOM. This strengthens the generated magnetic field during coarse magnetic field touch detection, improving detection accuracy.

[0356] While the example of performing magnetic field touch detection in each of the touch detection periods CSS21 to CSS2p has been described, if no touch is detected during the first period TF1, electric field touch detection can be performed in each of the touch detection periods CSS21 to CSS2p. This makes it possible to detect the presence of a finger touch across the entire area of the display panel 2 during the second period TF2.

[0357] For example, a switching control signal based on the control signal Y-CNT can be used to control the switch control circuits SWL and SWR, thereby enabling switching between coarse magnetic field touch detection and fine magnetic field touch detection based on the control signal Y-CNT. When the switching control signal indicates coarse magnetic field touch detection, the switch control circuits SWL and SWR supply the drive signal TSVCOM and the ground voltage Vss to a pair of drive electrodes arranged such that a drive electrode corresponding to a unit drive circuit outputting a selection signal indicating selection is sandwiched therebetween, and an adjacent drive electrode sandwiched therebetween, enables coarse magnetic field touch detection.

[0358] In addition, if Figure 22As shown, when the unit drive circuits correspond to the drive electrodes respectively, by changing the timing of supplying the selection information SEI indicating selection to the shift register composed of the unit drive circuits, it is possible to switch between rough magnetic field touch detection and fine magnetic field touch detection.

[0359] <Magnetic field touch detection operation>

[0360] Figure 26 This is a timing diagram showing the relationship between the touch detection period and the display period. Figure 25 As shown, touch detection periods CSS11 to CSS1p, CSS21 to CSS2p and display periods DPS1 to DPSp are generated alternately. Figure 26 In the example, the display period is generated after the touch detection period. Figure 26 In the embodiment, in order to collectively represent the touch detection periods CSS11 to CSS1p and CSS21 to CSS2p, the touch detection periods are represented by reference symbol CSS, and in order to collectively represent the display periods DPS1 to DPSp, the display periods are represented by reference symbol DP. Figure 26 In FIG, it is shown that the magnetic field touch detection is performed during the touch detection period CSS. Figure 26 , the horizontal axis also represents time t.

[0361] Figure 26 (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 a magnetic field generation period TGT, a magnetic field detection period TDT, and a precharge period RST. During the precharge period RST, the voltages of the drive electrodes TL(0) to TL(p) and the signal lines SL(0) to SL(p) are precharged to predetermined values in preparation for the subsequent display period DPS.

[0362] As described above, the magnetic field generation period TGT is a period during which a magnetic field is generated, and the magnetic field detection period TDT is a period during which the magnetic field from the pen is detected by the magnetic field detection coil. Figure 8 The control circuit D-CNT shown in FIG. 1 enables the magnetic field enable signal SC_EN during the touch detection period CSS. Figure 26 As shown in (C), it changes from high level to low level. Thus, magnetic field touch detection is specified. In addition, during the magnetic field generation period TGT, the control circuit D-CNT Figure 26 As shown in (B), the drive signal TSVCOM is periodically varied. As described above, the drive signal TSVCOM is supplied to each of the pair of drive electrodes disposed so as to sandwich the drive electrodes, generating a magnetic field corresponding to the variation in the drive signal TSVCOM. The magnetic fields are superimposed in the region of the drive electrodes sandwiched between the pair of drive electrodes.

[0363] The capacitive element in the pen is charged by the magnetic field generated during the magnetic field generation period TGT. If the pen touches, the magnetic field generated by the pen is detected by the magnetic field detection coil during the magnetic field detection period TDT, and a detection signal corresponding to the detected magnetic field is output from the magnetic field detection coil. In addition, during the display period DPS, the control circuit D-CNT is as follows Figure 26 As shown in (B), the driving 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 27 , an example of a detection circuit that detects whether a pen is touching based on the detection signal from the magnetic field detection coil is described. Figure 8 In FIG, the detection circuit for detecting a touch is constituted by the amplifier circuit AMP and the touch semiconductor device 6 , but here, an example of a detection circuit using a microcontroller MCU is shown.

[0365] Figure 26 (D)~ Figure 26 (F) is used to illustrate Figure 27 The timing diagram of the detection circuit is shown in FIG. Figure 27 The structure and operation of the detection circuit shown in the figure are described in detail. Figure 26 (D)~ Figure 26 (F).

[0366] In Figure 27 In the embodiment, MPX is a multiplexer (selector) including a plurality of switches SWA0 to SWAp. During the magnetic field detection period TDT, as described in the first embodiment, the magnetic field detection coils CY(0) to CY(p) are formed by the signal lines SL(0) to SL(p) or the 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, by Figure 19 The magnetic field detection coil CY(0), formed by connecting two signal lines arranged parallel to each other, has one end connected to one end of the 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] The other end of each of switches SWA0 through SWAp is connected to node nA. During the magnetic field detection period TDT, one of the switches SWA0 through SWAp is selected and turned on. This selection is performed by the microcontroller MCU. Specifically, a selection signal from the microcontroller MCU selects one of switches SWA0 through SWAp and turns it on. Figure 26 (D) shows the waveform of the selection signal SC_SEL that turns on one of the switches SWA0 to SWAp. Figure 26 In (D), the selection signal SC_SEL changes from a high level to a low level, and the switch is turned on.

[0368] During the magnetic field detection period TDT, one of the switches SWA0 to SWAp is turned on, transmitting the detection signal from the magnetic field detection coil to node nA. The detection signal from node nA is supplied to the gain circuit for amplification. To remove noise, the amplified detection signal is supplied to the filter circuit. The filter circuit output is rectified by the rectifier circuit and supplied to the integration circuit. The integration circuit output is then supplied to the microcontroller MCU.

[0369] Although not shown, the microcontroller MCU includes an analog / digital conversion circuit, a clock signal generation circuit, a nonvolatile memory storing a program, and a processing unit that operates according to the program stored in the nonvolatile memory. The output from the integration circuit is supplied to the analog / digital conversion circuit via the ADC terminal of the microcontroller MCU and converted into a digital signal. The processing unit processes the converted digital signal to determine whether the pen is in proximity to one of the coils CY(0) to CY(p).

[0370] The processing units within the microcontroller (MCU) generate control signals based on the program. These control signals include the select signals for the selector switches SWA0 through SWAp, the enable signal EN, and the reset signal RST. Furthermore, the clock signal generation circuit within the MCU generates the clock signal MCLK, whose voltage periodically changes.

[0371] Clock signal MCLK is supplied to buffer circuit BF. Buffer circuit BF is controlled by enable signal EN. When enable signal EN is high, clock signal MCLK is supplied to node nA via resistor R11. On the other hand, when enable signal EN is low, the output of buffer circuit BF enters a high-impedance state (Hi-Z).

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

[0373] The filter circuit includes resistors R4-R7, capacitor CP2, and an operational amplifier OP3. The positive input (+) of the operational amplifier OP3 is connected to ground voltage Vss via resistor R7, and the output signal from the gain circuit is supplied via capacitor CP2. Furthermore, the negative input (-) of the operational amplifier OP3 is connected to ground voltage Vss via resistor R6 and to the output of the operational amplifier via resistor R5. Furthermore, the output of the operational amplifier OP3 is connected to the input of the filter circuit via resistor R4.

[0374] The rectifier circuit includes resistors R1-R3, an operational amplifier OP2, and a diode D. The positive input (+) of the operational amplifier is connected to ground voltage Vs via resistor R3. The negative input (-) of the operational amplifier OP2 is supplied with the output of the filter circuit via resistor R2. Furthermore, the output of the rectifier circuit is supplied via resistor R1. The output of the operational amplifier OP2 is output via diode D.

[0375] The integration circuit includes a capacitor element CP1, a switch SWAA that receives a reset signal rst as a switch control signal, and an operational amplifier OP1. The operational amplifier's positive input (+) is connected to ground voltage Vss, while its negative input (-) is connected to the integration circuit's output via capacitor element CP1. Furthermore, a switch SWAA is connected between the integration circuit's output and input.

[0376] exist Figure 26 At time t0, the reset signal rst goes low. This turns the switch SWAA off, releasing the reset state. At this point, the microcontroller MCU turns the enable signal EN high. This causes the clock signal CLK to be 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 changes according to the voltage change of the clock signal MCLK. Figure 26The output OUT1 of the gain circuit is supplied to the rectifier circuit via the filter circuit, and the rectified output is supplied to the integration circuit. From time t0 to time t1, the voltage at node nA changes periodically, but there is no change in the envelope, so the output of the integration circuit remains constant.

[0378] At time t1, the microcontroller MCU sets the enable signal EN to a low level. As a result, the node nA becomes a high impedance state (Hi-Z). In addition, at time t1, the select signal SC_SEL ( Figure 26 (D)), for example, the switch SWA3 corresponding to the coil CY(3) is turned on. As a result, one end of the coil CY(3) is connected to the node nA.

[0379] At this time, since there is a pen near the coil CY (3), the magnetic field generated during the magnetic field generation period TGT from time t0 to t2 generates an induced voltage in the coil inside the pen, which in turn generates an induced voltage on the capacitive element C ( Figure 2 ) for charging.

[0380] At time t1, the coil L1 in the pen generates a magnetic field according to the amount of charge stored in the capacitor C. The change in the magnetic field generated by the coil L1 generates an induced 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), it attenuates while oscillating. That is, the voltage attenuates on the envelope. The output OUT1 of the gain circuit attenuates while oscillating from time t1, so the output OUT2 of the integration circuit is as follows Figure 26 As shown in (F), the value gradually rises. The microcontroller MCU converts the output OUT2 of the integrator circuit into a digital signal, thereby determining the presence of a pen. At this time, the microcontroller MCU uses the selection signal SC_SEL to determine which switch among switches SWA0 to SWAp is in the on state, thereby determining the position of the selected magnetic field generating coil. Therefore, based on the value of the digital signal obtained by conversion and the determined position of the magnetic field detection coil, the position of the pen, that is, the touched position, and the pen pressure can be determined. By repeating the above steps, the presence of a pen and the pen pressure can be determined.

[0382] exist Figure 27 In the detection circuit shown, the gain circuit, filter circuit, rectifier circuit, and integration circuit can be shared by a plurality of magnetic field detection coils CY(0) to CY(p), thereby suppressing an increase in the area occupied by the detection circuit.

[0383] (Implementation Method 4)

[0384] Figure 28 1 is a plan view showing the structure of a display device 1 according to the fourth embodiment. Figure 28 , a schematic top view of the display panel 2 is shown.

[0385] exist Figure 28 In FIG, Tx1-1 to TxN-M represent driving electrodes (detection electrodes) arranged in a dot matrix in the display panel 2. The driving electrodes arranged in a dot matrix can detect, for example, whether a finger touches or not as a change in the amount of charge. In this figure, among the driving electrodes arranged in a dot matrix, driving electrodes arranged according to 5 rows and 5 columns are shown. In addition, SDL(1) to SDL(m) represent detection signal lines, and GL(1) to GL(n) represent scanning lines. In the display panel 2, detection signal lines SDL(1) to SDL(m) are arranged in parallel with the signal lines SL(0) to SL(p) not shown. For example, if referring to Figure 10 To 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) extend in the column direction and are arranged in parallel in the row direction, similarly to these signal lines SL(0) to SL(p).

[0386] The drive electrodes Tx1-1 to TxN-M arranged in a dot matrix are connected one-to-one to the corresponding detection signal lines SDL(1) to SDL(m). For example, the drive 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 to the corresponding detection signal lines SDL(1), SDL(n+1), SDL(2n+1), SDL(k+1), and SDL(mn). Furthermore, the drive 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 to the corresponding detection signal lines SDL(n), SDL(2n), SDL(3n), SDL(k+n), and SDL(m).

[0387] In this fourth embodiment, a finger touch is detected by detecting signal changes on each of the detection signal lines SDL(1) to SDL(m). In this case, the detection signal lines correspond one-to-one to the drive electrodes, so by detecting signal changes on the detection signal lines SDL(1) to SDL(m), the touched position can be determined.

[0388] Figure 29 This is a circuit diagram showing the principle of touch detection using driving electrodes Tx1-1 to TxN-M arranged in a dot matrix. Here, the driving electrodes TxN-M are used as an example for description. Figure 29In FIG, OP5 represents an operational amplifier, CP5 represents a capacitor element, and SWD1 to SWD3 represent switches.

[0389] There is a parasitic capacitance C2 between drive electrode TxN-M and ground voltage Vss. First, switch SWD3 is turned on, and switches SWD1 and SWD2 are turned off. This discharges the charge accumulated in capacitive element CP5 via switch SWD3. Next, switch SWD3 is turned off, and switch SWD1 is turned on. At this point, if a finger touches drive electrode TxN-M, the capacitance between the finger and the capacitive element also charges.

[0390] Next, the switch SWD1 is turned off and the switch SWD2 is turned on. By utilizing the feedback of the capacitor element CP5, the two inputs of the operational amplifier OP5 are virtually at the same potential (at Figure 29 Because the ground voltage Vss is maintained at the middle ground voltage (the ground voltage Vss), the charge accumulated in the drive electrode TxN-M moves to the capacitor element CP5. Therefore, if a finger touches the drive 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 the finger touches the drive electrode TxN-M. This change in signal detects whether the finger has touched the drive electrode TxN-M. In other words, the signal output from the operational amplifier OP5 becomes the sensing signal S.

[0391] In this way, by detecting the change in the signal of each of the driving electrodes Tx1-1 to TxN-M, it is possible to detect a touch with a finger. Figure 29 In the detection method shown, switch SWD1 is turned on, a drive signal is supplied to a drive electrode (e.g., TxN-M), and changes in the signal at the same drive electrode TxN-M are detected to detect a finger touch. In other words, finger touch is detected based on changes in the signal at the drive electrode to which the drive signal is supplied. This is what is known as a capacitive self-detection method.

[0392] The scanning lines GL(1) to GL(n) are configured to be orthogonal to the detection signal lines SDL(1) to SDL(m) and the signal lines SL(1) to SL(m) not shown. In the fourth embodiment, when a magnetic field touch is detected, the scanning lines GL(1) to GL(n) are used as signal wiring for generating a magnetic field. That is, during the magnetic field generation period TGT, the scanning lines GL(1) to GL(n) are used as the driving electrodes TL(0) to TL(p) described in the first embodiment. Although not particularly limited, a plurality of scanning lines are bundled and used as one driving electrode. In Figure 28In the example shown, 20 scanning lines form a bundle. That is, scanning lines GL(1) to GL(20) form a bundle, scanning lines GL(21) to GL(40) form a bundle, scanning lines GL(41) to GL(60) form a bundle, scanning lines GL(61) to GL(80) form a bundle, and scanning 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 scanning lines in the same manner as in the first embodiment. For example, a drive signal TSVCOM is supplied to one end of the bundled scanning lines GL(1) to GL(20) from the side 2-L of the display panel 2, and a ground voltage Vss is supplied to the other end from the side 2-R of the display panel 2. At this time, for example, a ground voltage Vss is supplied to one end of the bundled scanning lines GL(41) to GL(60) from the side 2-L of the display panel 2, and a drive signal TSVCOM is supplied to the other end from the side 2-R of the display panel 2. As a result, magnetic fields are generated in the bundle of scanning lines GL(1) to GL(20) and the bundle of scanning lines GL(41) to GL(60), respectively, and the magnetic fields overlap in the region of scanning lines GL(21) to GL(40).

[0394] In the fourth embodiment, the driving electrodes Tx1-1 to TxN-M and the detection signal lines SDL(1) to SDL(m) are formed on the TFT glass substrate TGB, and the detection electrodes RL(0) to RL(p) formed on the CF glass substrate CGB form a magnetic field detection coil. The magnetic field detection coil formed by the detection electrodes RL(0) to RL(p) formed on the CF glass substrate CGB is as described above. Figure 21 , and therefore, the description thereof is omitted. In the fourth embodiment, a finger touch is detected by driving electrodes formed on the TFT glass substrate TGB and arranged in a dot matrix. Therefore, the detection electrodes RL(0) to RL(p) formed on the CF glass substrate CGB do not need to be used for detecting a finger touch, and thus the detection electrodes RL(0) to RL(p) can be fixed to a shape suitable for detecting a magnetic field (e.g., a coil shape).

[0395] Furthermore, in the fourth embodiment, a plurality of scanning lines are bundled together, so that during the magnetic field generation period TGT, the combined resistance of the scanning lines can be reduced, and the generated magnetic field can be strengthened.

[0396] <Variation 1>

[0397] exist Figure 28 In the embodiment, the detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB are used for detecting the magnetic field. Figure 28The detection electrodes TX1-1 to TxN-M shown are used for magnetic field detection. Therefore, the CF glass substrate CGB does not need to be provided with the detection electrodes RL(0) to RL(p) for magnetic field detection, and can be manufactured at low cost.

[0398] <Modification 2>

[0399] Figure 38 1 is a plan view showing the configuration of a display device 1 according to a second modification of the fourth embodiment. Figure 38 , a schematic top view of the display panel 2 is shown. Figure 38 and Figure 28 are similar, so only the differences are described here.

[0400] exist Figure 38 In the second modification shown, the detection signal lines SDL(1)P to SDL(m)P that form pairs with the detection signal lines SDL(1) to SDL(m) extend in parallel with the paired detection signal lines SDL(1) to SDL(m). Figure 28 In order to avoid complicating the drawings, only the detection signal lines that are paired with the detection signal lines SDL(1), SDL(2) and SDL(n) are marked with the reference numerals SDL(1)P, SDL(2)P and SDL(n)P, respectively, and the reference numerals of the other detection signal lines are omitted.

[0401] Here, in Figure 38 In this example, the leftmost column (drive electrodes Tx1-1 to TxN-1) is used as an example, but the same applies to the other columns. Detection signal line SDL(1) and detection electrode SDL(1)P extend parallel to drive electrode Tx1-1, and are connected to drive electrode Tx1-1. Detection signal line SDL(2) and detection electrode SDL(2)P also extend parallel to drive electrode Tx2-1. Similarly, detection signal line SDL(n) and detection electrode SDL(n)P extend parallel to drive electrode TxN-1.

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

[0403] Since magnetic field detection coils are formed in the detection signal lines SDL(1) to SDL(m) and SDL(1)P to SDL(m)P, there is no need to configure detection electrodes for magnetic field detection in the CF glass substrate CGB, and thus it can be manufactured at a low cost. Figure 28 The electric field touch detection is performed in the same manner as described in .

[0404] Alternatively, it is also possible to use only a specific pair of detection signal lines among the multiple pairs of detection signal lines arranged in one column (driving electrodes Tx1-1 to TxN-1) to detect the magnetic field during magnetic field touch detection. Figure 38 The detection signal lines SDL(1) and SDL(1)P are shown. These detection signal lines SDL(1) and SDL(1)P are connected to the drive electrode Tx1-1 arranged in the first row, so the number of orthogonal scanning lines increases, and the detectable range is widened during magnetic field touch detection, making them suitable for magnetic field touch detection. Similarly, in other columns of the dot matrix, among the multiple pairs of detection signal lines included in each column, the detection signal lines connected to the drive electrodes Tx1-2 to Tx1-M arranged in the first row are used as magnetic field detection coils during magnetic field touch detection.

[0405] <Variation 3>

[0406] Figure 39 1 is a plan view showing the configuration of a display device 1 according to a third modification of the fourth embodiment. Figure 39 , a schematic top view of the display panel 2 is shown. Figure 39 and Figure 28 are similar, so only the differences are described here.

[0407] exist Figure 28In the third modification, the detection signal lines SDL(1) to SDL(m) extend to the area connected to the corresponding drive electrodes. In contrast, in this modification, the detection signal lines SDL(1) to SDL(m) extend transversely across the display panel 2. For example, they are configured to extend from side 2-D to side 2-U of the display panel 2. Here, the first column of the dot matrix (drive electrodes Tx1-1 to TxN-1) is used as an example for description, but the same applies to other columns.

[0408] Detection signal line SDL(1) extends from side 2-D to side 2-U, connecting to drive electrode Tx1-1 along the way. Detection signal line SDL(2) also extends from side 2-D to side 2-U, connecting to drive electrode Tx2-1 along the way. Similarly, detection signal line SDL(n) also extends from side 2-D to side 2-U, connecting to drive electrode TxN-1 along the way.

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

[0410] When the magnetic field touch detection is on, the switch SDS and Figure 19 The eighth switches k00 to kp shown in FIG. 1 are similarly turned on. This connects the plurality of detection signal lines. Figure 39 In the example shown in FIG2 , detection signal lines SDL(1) and SDL(2) are connected on the side 2-U. Thus, when a magnetic field touch is detected, a magnetic field detection coil is formed by the detection signal lines SDL(1) and SDL(2). At this time, a ground voltage Vss is supplied to the detection signal line SDL(2), and a change in the signal on the detection signal line SDL(1) is output as a sensing signal S.

[0411] Thus, the magnetic field detection coil is formed using the detection signal lines SDL(1) to SDL(m), so there is no need to configure the detection electrodes for magnetic field detection in the CF glass substrate CGB, so it can be manufactured cheaply. Figure 28 The electric field touch detection is performed in the same manner as described in .

[0412] exist Figure 39 In the example described above, the magnetic field detection coil is formed using adjacent detection signal lines SDL(1) and SDL(2), but the present invention is not limited to this. Specifically, detection signal lines arranged with the detection signal lines interposed therebetween may be connected via a switch to form overlapping magnetic field detection coils. Furthermore, instead of a primary winding, a secondary winding of 1.5 or more may be used.

[0413] <Variation 4>

[0414] Figure 30 It is a plan view showing the configuration of a display device 1 according to a fourth modification of the fourth embodiment. Figure 30 and Figure 28 Similar, so here we mainly explain the differences. Figure 30 In , SL(0)~SL(p) represent signal lines. Figure 28 As described above, the detection signal lines SDL( 1 ) to SDL(m) are arranged in parallel with the signal lines SL( 0 ) to SL(p) in the display panel 2 .

[0415] In this modification, the signal lines SL(0) to SL(p) are used as signal wiring for generating a magnetic field. Although not particularly limited, in this modification, a plurality of signal lines are bundled and supplied with a drive signal TSVCOM during the magnetic field generation period TGT. Figure 30 For example, during the magnetic field generation period TGT, signal lines SL(0) to SL(19) are bundled, signal lines SL(20) to SL(39) are bundled, and signal lines SL(40) to SL(59) are bundled. Furthermore, signal lines SL(k) to SL(k+19) are bundled, and 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, a drive signal TSVCOM is supplied to one end of the bundled signal lines SL(0) to SL(19) on the side 2-U of the display panel 2, and a ground voltage Vss is supplied to the other end on the side 2-D of the display panel 2. At this time, for example, a ground voltage Vss is supplied to one end of the bundled signal lines SL(40) to SL(59) on the side 2-U of the display panel 2, and a drive signal TSVCOM is supplied to the other end on the side 2-D of the display panel 2. Thus, during the magnetic field generation period TGT, an overlapping magnetic field is formed in the region of the signal lines SL(20) to SL(39).

[0417] In the case of this modification, the magnetic field detection coil is formed by, for example, the detection electrodes RL(0) to RL(p) formed on the CF glass substrate CGB. When 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, as shown in FIG. Figure 21 As shown, predetermined detection electrodes are connected. In addition, the magnetic field detection coil can also be formed by the scanning lines GL(0) to GL(p).

[0418] Alternatively, the magnetic field can be detected by the detection electrodes Tx1-1 to TxN-M. Detecting the magnetic field by the detection electrodes Tx1-1 to TxN-M eliminates the need for disposing detection electrodes for magnetic field detection on the CF glass substrate CGB, which enables inexpensive manufacturing.

[0419] <Variation 5>

[0420] Figure 40 It is a plan view showing the configuration of a display device 1 according to a fifth modification of the fourth embodiment. Figure 40 and Figure 30 In this modification example 5, detection signal lines SDL(1)L to SDL(m)L are arranged to extend parallel to the detection signal lines SDL(1) to SDL(m). Figure 40 In order to avoid complication of the drawings, only the detection signal lines arranged in the driving electrodes Tx1-1 to TxN-1 in the first column are marked with reference symbols SDL(1)L, SDL(2)L, and SDL(n)L.

[0421] Here, the driving electrodes of the first column are used as an example for explanation, but the same applies to the other columns. The detection signal line SDL(1)L extends parallel to 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 driving electrode Tx1-1 connected to the detection signal line SDL(1). In addition, the detection signal line SDL(2)L extends parallel to 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 driving electrode Tx2-1 connected to the detection signal line SDL(2). Subsequently, similarly, the detection signal line SDL(n)L extends parallel to 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 driving electrode TxN-1 connected to the detection signal line SDL(n).

[0422] The loop LPP is formed by, for example, connecting detection signals connected to each other by bending them in a plan view.

[0423] In this fifth variation, the loop LPP functions as a magnetic field detection coil. Specifically, when a magnetic field touch is detected, the signal change on one of the connected detection signal lines becomes a sensing signal S, while the ground voltage Vss is supplied to the other detection signal line. Consequently, if a pen touches near a drive electrode, the magnetic field from the pen causes a signal change on the detection signal line forming the loop LPP in the region of the drive electrode, enabling the pen touch and coordinates to be determined.

[0424] For example, when the detection signal lines SDL(1)L, SDL(2)L to SDL(n)L are each set as the other detection signal line of the detection signal lines forming a loop, the ground voltage Vss is supplied to each of these detection signal lines SDL(1)L, SDL(2)L to SDL(n)L. In this case, the signal changes in the detection signal lines SDL(1), SDL(2) to SDL(n), which are one of the detection signal lines forming the loop, are detected as the sensing signal S. This makes it possible to detect which part of the first column the pen has touched, and to detect which row within the first column (which area of the drive electrodes Tx1-1 to TxN-1) has been touched.

[0425] In this fifth variation, the detection signal line is also used as a magnetic field detection coil, enabling cost-effective manufacturing. Furthermore, electric field touch detection can be performed similarly to the fourth variation. Furthermore, the detection signal line can be shared for both magnetic field detection and electric field detection, thereby minimizing price increases for display devices capable of both magnetic field touch detection and electric field touch detection.

[0426] (Implementation Method Five)

[0427] In the first to fourth embodiments, examples of generating a magnetic field during the magnetic field generation period TGT using signal wiring arranged orthogonally to the signal lines SL(0) to SL(p) in the display panel 2 are mainly described. In this fifth embodiment, an example of generating a magnetic field during the magnetic field generation period TGT using signal wiring arranged parallel to the signal lines SL(0) to SL(p) in the display panel 2 is described. Here, a case where a drive electrode is used as the signal wiring arranged parallel to the signal lines SL(0) to SL(p) is described.

[0428] Figure 31 1 is a schematic plan view showing the configuration of a display device 1 according to the fifth embodiment. Figure 31 In FIG, the portion involved in the display panel 2 is shown. In the display panel 2, a plurality of signal lines SL(0) to SL(p), a plurality of scanning lines GL(0) to GL(p), and a plurality of driving electrodes TL(0) to TL(p) are configured. Figure 31In the figure, for ease of explanation, a display panel 2 is shown in which signal lines SL(0) to SL(7), scanning lines GL(0) to GL(3), and driving electrodes TL(0) to TL(7) are arranged. The signal lines SL(0) to SL(7) extend in the column direction and are arranged in parallel in the row direction in the display panel 2. In this fifth embodiment, during the magnetic field generation period TGT, the driving electrodes TL(0) to TL(7) to which the driving signals are supplied are arranged in parallel with the signal lines SL(0) to SL(7). That is, the driving electrodes TL(0) to TL(7) also extend in the column direction and are arranged in parallel in the row direction in the display panel 2.

[0429] The scanning 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 fifth embodiment, although not particularly limited, gate drivers 5-1 and 5-2 are respectively arranged along the side 2-L and the side 2-R of the display panel 2. The scanning lines GL(0) to GL(3) are connected to the gate driver 5-1 on the side 2-L and to the gate driver 5-2 on the side 2-R. In the display panel 2, when displaying, the gate driver 5-1 supplies a high-level scanning line signal to the scanning line GL(0), and at the next timing, the gate driver 5-2 supplies a high-level scanning line signal to the next scanning line GL(1). That is, the high-level scanning line signals are alternately supplied to the scanning lines GL(0) to GL(3) from the gate drivers 5-1 and 5-2. This can prevent the frame from becoming larger.

[0430] exist Figure 31 In , 3 represents the signal line selector. Figure 8 The signal line selector 3 is described in the figure, so its description is omitted. In this figure, SCW-D and SCW-U represent 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 during touch detection. That is, during touch detection, the connection circuit SCW-D connects the drive electrode TL(0) and the signal line SL(0) on the side 2-D, and the connection circuit SCW-U connects the drive electrode TL(0) and the signal line SL(0) on the side 2-U. Similarly, during touch detection, the drive electrode TL(1) and the signal line SL(1) are connected through the connection circuits SCW-D and SCW-U. The remaining drive electrodes and signal lines are also electrically connected during touch detection. Thus, during touch detection, the drive electrodes and signal lines that overlap when viewed from above are connected in parallel, which can reduce the combined resistance.

[0431] exist Figure 31In the figure, SU-R and SD-R represent drive circuits, and SU-C and SD-C represent selection circuits. Similar to the first embodiment, the drive circuit SU-R and the selection circuit SU-C form a selection drive circuit (first drive circuit or second drive circuit) SSU, and the drive circuit SD-R and the selection circuit SD-C form a selection drive circuit (second drive circuit or first drive circuit) SSD. The selection drive circuit SSU is positioned along side 2-U of the display panel 2, and the selection drive circuit SSD is positioned along side 2-D of the display panel 2.

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

[0433] exist Figure 31 In FIG. 1 , VCOM represents a voltage wiring to which a predetermined voltage VCOMDC is supplied. In addition, TPL represents a voltage wiring to which a ground voltage Vss is supplied, and TPH represents a voltage wiring to which a predetermined voltage (e.g. Figure 15 The selective drive circuits SSU and SSD are connected to the drive electrodes selected by the voltage wiring TPL in order to supply the ground voltage Vss to the selected drive electrodes. Furthermore, the selective drive circuits SSU and SSD are connected to the drive electrodes selected by the voltage wiring TPH in order to supply the drive signals to the selected drive electrodes.

[0434] The magnetic field detection coil is formed, for example, by the detection electrodes RL(0) to RL(p) formed on the CF glass substrate CGB. In the fifth embodiment, the detection electrodes RL(0) to RL(p) extend in the row direction and are arranged parallel to the column direction in the display panel 2, similarly to the scanning lines. Furthermore, during the magnetic field detection period TDT, the predetermined detection electrodes are connected to form the magnetic field detection coil. Alternatively, the magnetic field detection coil can be formed by the scanning lines GL(0) to GL(3).

[0435] In this fifth embodiment, during electric field touch detection, the selection drive circuit SSD supplies a drive signal to the selected drive electrode. This generates an electric field in the selected drive electrode. In this case, for example, changes in the electric field are detected by the detection electrodes RL(0) to RL(p) or the scanning lines GL(0) to GL(3) formed on the CF glass substrate CGB.

[0436] It should be noted that, although not particularly limited, the gate drivers 5-1 and 5-2 have the function of putting the scanning lines GL(0) to GL(3) into a floating state, for example, during the magnetic field generation period TGT, putting the scanning lines GL(0) to GL(3) into a floating state.

[0437] <Selecting the Configuration of the Driving Circuit>

[0438] Figure 32 This is a circuit diagram showing the configuration of selection drive circuits SSU and SSD according to the fifth embodiment. Figure 32 This figure is a schematic diagram, but is depicted in conjunction with the actual configuration. Figure 31 The driving electrodes TL(0) to TL(7) shown are the driving electrodes TL(0) to TL(6), and the selection driving circuits SSU and SSD corresponding to the driving electrodes TL(0) to TL(6).

[0439] like Figure 31 As shown, the selection drive circuit SSU is configured along the side 2-U of the display panel 2, and the selection drive circuit SSD is configured along the side 2-D of the display panel 2. The drive circuit SU-R within the selection drive circuit SSU includes unit drive circuits USU(0) to USU(6) corresponding to the drive electrodes TL(0) to TL(6) and configured along the side 2-U. Similarly, the drive circuit SD-R within the selection drive circuit SSD includes unit drive circuits USD(0) to USD(6) corresponding to the drive electrodes TL(0) to TL(6) and configured along the side 2-D.

[0440] In the fifth embodiment, the voltage wirings TPL and TPH are arranged to surround the display panel 2. Figure 9 Using the illustrated module as an example, voltage traces TPL and TPH are arranged to pass through the area between side 2-L of display panel 2 and side 900-L of module 900, the area between side 2-U of display panel 2 and side 900-U of module 900, the area between side 2-R of display panel 2 and side 900-R of module 900, and the area between side 2-D of display panel 2 and side 900-D of module 900. Specifically, voltage traces TPL and TPH are arranged within the upper and lower, and left and right frames of module 900. On the other hand, voltage trace VCOM is arranged within the area between side 2-D of display panel 2 and module 900-D.

[0441] In the fifth embodiment, the selection circuit SU-C within the selection drive circuit SSU includes 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 one end of the corresponding drive electrode, and is switched by a selection signal from the corresponding unit drive circuit. The eleventh switch USW2 is connected between the voltage wiring TPL and one end of the corresponding drive electrode, and is switched by a selection signal from the corresponding unit drive circuit.

[0442] That is, in the unit selection circuit UUC(0), the tenth switch USW1 is connected between the voltage wiring TPH and one end of the drive electrode TL(0), and is switched on and off by a selection signal C10 from the unit selection circuit USU(0). Furthermore, in the unit selection circuit UUC(0), the eleventh switch USW2 is connected between the voltage wiring TPL and one end of the drive electrode TL(0), and is switched on and off by a selection signal C20 from the unit selection circuit USU(0). In the unit selection circuit UUC(1), the tenth switch USW1 and the eleventh switch USW2 are connected between the voltage wirings TPH and TPL and one end of the drive electrode TL(1), and are switched on and off by selection signals C11 and C21 from the unit selection circuit USU(1). In the unit selection circuit UUC (2), the tenth switch USW1 and the eleventh switch USW2 are connected between the voltage wirings TPH and TPL and one end of the drive electrode TL (2), and are switched by selection signals C12 and C22 from the unit selection circuit USU (2).

[0443] Similarly, in the unit selection circuit UUC (3), the tenth switch USW1 and the eleventh switch USW2 are connected between the voltage wirings TPH and TPL and one end of the drive electrode TL (3), and are switched by selection signals C13 and C23 from the unit selection circuit USU (3). In the unit selection circuit UUC (4), the tenth switch USW1 and the eleventh switch USW2 are connected between the voltage wirings TPH and TPL and one end of the drive electrode TL (4), and are switched by selection signals C14 and C24 from the unit selection circuit USU (4). In the unit selection circuit UUC (5), the tenth switch USW1 and the eleventh switch USW2 are connected between the voltage wirings TPH and TPL and the end of one side of the drive electrode TL (5), and are switched by selection signals C15 and C25 from the unit selection circuit USU (5). In the unit selection circuit UUC (6), the tenth switch USW1 and the eleventh switch USW2 are connected between the voltage wirings TPH and TPL and the end of one side of the drive electrode TL (6), and are switched by selection signals C16 and C26 from the unit selection circuit USU (6).

[0444] The drive circuit SD-R within 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. Furthermore, the selection circuit SD-L includes unit selection circuits UDC(0) to UDC(6), respectively corresponding to the drive electrodes and the unit drive circuits. The unit selection circuits UDC(0) to UDC(6), respectively, include a twelfth switch USW3, a thirteenth switch USW4, and a fourteenth switch USW5, each of which is switched by a control signal from the corresponding unit selection circuit. The twelfth switch USW3 is connected between the other end of the corresponding drive electrode and the voltage wiring VCOM, the thirteenth switch USW4 is connected between the other end of the corresponding drive electrode and the voltage wiring TPL, and the fourteenth switch USW5 is connected between the other end of the corresponding drive electrode and the voltage wiring 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 wiring VCOM, the thirteenth switch USW4 is connected between the other end of the drive electrode TL(0) and the voltage wiring TPL, and the fourteenth switch USW5 is connected between the other end of the drive electrode TL(0) and the voltage wiring TPH. Furthermore, the twelfth switch USW3 in the unit selection circuit UDC(0) is switched by a selection signal S30 from the unit drive circuit USD(0), the thirteenth switch USW4 is switched by a selection signal S40 from the unit drive circuit USD(0), and the fourteenth switch USW5 is switched by a selection signal S40 from the unit drive circuit USD(0).

[0446] Furthermore, 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 wirings VCOM, TPL, and TPH, and are switched by selection signals S31 and 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 wirings VCOM, TPL, and TPH, and are switched by selection signals S32 and 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 wirings VCOM, TPL, and TPH, and are switched by selection signals S33 and 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 wirings VCOM, TPL, and TPH, and are switched by selection signals S34 and 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 wirings VCOM, TPL, and TPH, and are switched by selection signals S35 and S45 from the unit drive circuit USD (5). In addition, 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 wirings VCOM, TPL, and TPH, and are switched by selection signals S36 and S46 from the unit drive circuit USD (6).

[0448] In order to avoid complicating 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 a single selection signal (e.g., selection signal S40), but the thirteenth switch USW4 and the fourteenth switch USW5 are separately switched by the corresponding unit drive circuits.

[0449] In the fifth embodiment, during the magnetic field generation period TGT, Figure 22 Similarly to the case described in , a drive signal or ground voltage Vss is supplied to the drive electrode corresponding to the selected unit drive circuit. In this case, the drive signal corresponds to a predetermined voltage in the voltage wiring TPH, and supplying the predetermined voltage in the voltage wiring TPH to the drive electrode corresponds to supplying the drive signal.

[0450] Each unit drive circuit USU (0) to USU (6) includes a shift segment, and each shift segment is connected in series according to this order. Similarly, each unit drive circuit USD (0) to USD (6) also includes a shift segment, and each shift segment is connected in series according to this order. For example, selection information SEI indicating selection is set in the unit drive circuits USU (0), USU (1), USD (0), and USD (1), and the selection information SEI is sequentially shifted 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(1), USD(0), and USD(1), then during the magnetic field generation period TGT, the unit drive circuit USU(0) turns on the eleventh switch USW2 in the unit selection circuit UUC(0) by the selection signal S20 and turns off the tenth switch USW1 by the selection signal S10. At this time, the unit drive circuit USU(1) turns on the tenth switch USW1 in the unit selection circuit UUC(1) by the selection signal S11 and turns off the eleventh switch USW2 by the selection signal S21.

[0452] At this time, the unit drive circuit USD(0) turns on the fourteenth switch USW5 and turns off the thirteenth switch USW4 by selecting the signal S40. Furthermore, the unit drive circuit USD(0) turns off the twelfth switch USW3 by selecting the signal S30. Furthermore, at this time, the unit drive circuit USD(1) turns on the thirteenth switch USW4 and turns off the fourteenth switch USW5 by selecting the signal S41. Furthermore, the unit drive circuit USD(1) turns off the twelfth switch USW3 by selecting the signal S30.

[0453] As a result, one end of the driving electrode TL(0) is connected to the voltage line TPL via the eleventh switch USW2 in the unit selection circuit UUC(0), and the other end of the driving electrode TL(1) is connected to the voltage line TPL via the thirteenth switch USW4 in the unit selection circuit UDC(1). At this time, the other end of the driving electrode TL(0) is connected to the voltage line TPH via the fourteenth switch USW5 in the unit selection circuit UDC(0), and one end of the driving electrode TL(1) is connected to the voltage line TPH via the tenth switch USW1 in the unit selection circuit UUC(1). As a result, the ground voltage Vss is supplied to one end of the driving electrode TL(0) and the other end of the driving electrode TL(1), and a predetermined voltage is supplied as a driving signal to the other end of the driving electrode TL(0) and one end of the driving electrode TL(1).

[0454] Due to this predetermined voltage, a current flows from the other end toward one end (toward the upper side in the figure) in the driving electrode TL(0), and a current flows from the one end toward the other end (toward the lower side in the figure) in the driving electrode TL(1), thereby generating magnetic fields in each of the driving electrodes TL(0) and TL(1), and overlapping magnetic fields in the area sandwiched between the driving electrodes TL(0) and TL(1).

[0455] It should be noted that at this time, the unit drive circuits USU (2) to USU (6) respectively select signals S12 to S16 and S22 to S26, thereby turning off the tenth switch USW1 and the eleventh switch USW2 in the corresponding unit selection circuits UUC (2) to UUC (6). In addition, at this time, the unit drive circuits USD (2) to USD (6) respectively select signals S32 to S36 and S42 to S46, thereby turning off the twelfth switch USW4, the thirteenth switch USW4, and the fourteenth switch USW5 in the corresponding unit selection circuits UDC (2) to UDC (6). As a result, the drive electrodes TL (2) to TL (6) are respectively in a high impedance state.

[0456] When the clock signal changes and the selection information SEI is transferred to the unit drive circuits USU (1), USU (2), UDC (1), and UDC (2), the unit drive circuit USU (1) turns off the tenth switch USW1 in the unit selection circuit UUC (1) and turns on the eleventh switch USW2 by selecting the signals S11 and S21. At this time, the unit drive circuit USU (2) turns on the tenth switch USW1 in the unit selection circuit UUC (2) and turns off the eleventh switch USW2 by selecting the signals S11 and S21. In addition, the unit selection circuit USD (1) turns on the fourteenth switch USW5 in the unit selection circuit UDC (1) and turns off the twelfth switch USW3 and the thirteenth switch USW4 by selecting the signals S31 and S41. Furthermore, the unit selection circuit USD(2) turns on the thirteenth switch USW4 in the unit selection circuit UDC(2) and turns off the twelfth switch USW3 and the fourteenth switch USW5 by selecting the signals S32 and S42.

[0457] As a result, a current flows from the other end toward one end of the driving electrode TL(1), and a current flows from one end toward the other end of the driving electrode TL(2). This current generates magnetic fields in the driving electrodes TL(1) and TL(2), generating overlapping magnetic fields. At this time, the tenth to fourteenth switches in the unit selection circuits UUC(0), UUC(3) to UUC(6) and UDC(0), UDC(3) to UDC(6), respectively, are turned off, and the driving electrodes TL(0), TL(3) to TL(6) are in a high impedance state.

[0458] Thereafter, in synchronization with the clock signal, the selection information SEI moves toward the unit drive circuits USU (6) and USD (6), and magnetic fields are sequentially generated. Specifically, a magnetic field is generated in the drive electrodes TL (2) and TL (3), and at the next timing, a magnetic field is generated in the drive electrodes TL (3) and TL (4), and at the next timing, a magnetic field is generated in the drive electrodes TL (4) and TL (5), and then a magnetic field is generated in the drive electrodes TL (5) and TL (6).

[0459] The direction of the current flowing through the drive electrodes is not limited to the above-described direction. For example, when a magnetic field is generated in the drive electrodes TL(0) and TL(1), the current may flow from one end toward the other end of the drive electrode TL(0), and the current may flow from the other end toward one end of the drive electrode TL(1). In other words, the directions of the currents between a pair of adjacent drive electrodes may be exactly opposite.

[0460] While the example of using drive electrodes arranged adjacent to each other has been described, the present invention is not limited thereto. For example, a magnetic field may be generated by drive electrodes arranged so as to sandwich one or more drive electrodes. For example, selection information SEI indicating selection may be set in the unit drive circuits USU(0), USC(2), USD(0), and USD(2). This generates a magnetic field in a pair of drive electrodes TL(0) and TL(2) arranged so as to sandwich drive electrode TL(1). Subsequently, by shifting the selection information SEI in synchronization with changes in the clock signal, magnetic fields are sequentially generated in the drive electrodes arranged so as to sandwich one drive electrode.

[0461] When electric field touch detection is performed, the unit drive circuits USU (0) to USU (6) respectively make the tenth switch USW1 and the eleventh switch USW2 in the corresponding unit selection circuits UUC (0) to UUC (6) into the off state through the selection signals S10 to S16 and S20 to S26. On the other hand, in the unit drive circuits USD (0) to USD (6), the selection information SEI moves sequentially. 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 on state through the selection signal S30. Thus, the drive electrode TL (0) is connected to the voltage wiring VCOM via the twelfth switch USW3. In this embodiment five, in the case of electric field touch detection, the control circuit D-CNT ( Figure 8 ) supplies an electric field driving signal with a periodically changing voltage to the voltage wiring VCOM. Thus, when electric field touch detection is performed, the driving electrode TL(0) generates an electric field according to the electric field driving signal.

[0462] It should be noted that at this time, the thirteenth switch USW4 and the fourteenth switch USW5 in the unit selection circuit UDC(0) are in the off state. In addition, the twelfth switch USW3, the thirteenth switch USW4, and the fourteenth switch USW5 in the remaining unit selection circuits USD(1) to USD(6) are also in the off state.

[0463] The selection information SEI moves from the unit drive circuit USD(0) toward USD(6), thereby sequentially generating an electric field from the drive electrode TL(2) toward TL(6).

[0464] While the example of supplying an electric field drive signal with a periodically varying voltage to the voltage wiring VCOM during electric field touch detection has been described, the present invention is not limited thereto. For example, rather than turning on the twelfth switch USW3 using the selection signal S30, the thirteenth and fourteenth switches USW4 and USW5 may be complementary turned on / off using the selection signal S40. By complementary turning on / off the thirteenth and fourteenth switches USW4 and USW5, the drive electrode TL(0) is alternately connected to the voltage wirings TPH and TPL. As a result, a voltage that varies over time is supplied to the drive electrode TL(0), generating an electric field that varies over time.

[0465] When magnetic field touch detection is used, the magnetic field detection coil can be formed by the detection electrodes RL(0) to RL(p) or the scanning lines GL(0) to GL(p), similar to the case described in the fourth embodiment. Alternatively, when electric field touch detection is used, the scanning lines can be used as detection electrodes for detecting changes in charge.

[0466] <Modification>

[0467] Figure 33 This is a circuit diagram showing the configuration of selection drive circuits SSU and SSD according to a modification of the fifth embodiment. Figure 33 Although it is a schematic diagram, it is depicted in accordance with the actual configuration. Figure 33 and Figure 32 Therefore, the differences are mainly explained here.

[0468] exist Figure 32 In the structure shown in FIG. 1 , the voltage wirings TPL and TPH are arranged so as to surround the display panel 2. Figure 33 In the variation shown, the edge 2-L of the display panel 2 and the module 900 ( Figure 9) is provided with a voltage wiring TPL in a region between the side 2-R of the display panel 2 and the side 900-R of the module 900. In other words, between the side 2-L of the display panel 2 and the side 900-R of the module 900 ( Figure 9 ) in the region between the side 900-L of the display panel 2 and the module 900 ( Figure 9 In the region between the sides 900-R of FIG. 1 and FIG. 2 , no voltage wiring TPL is arranged. That is, only one of the voltage wiring TPH and TPL is arranged on the left and right frames.

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

[0470] Thus, the ground voltage Vss and a predetermined voltage can be supplied to the selection drive circuit SSU arranged along the side 2 -U of the display panel 2 and the selection drive circuit SSD arranged along the side 2 -D of the display panel 2 while suppressing the increase in the frame.

[0471] (Implementation Method Six)

[0472] Figure 34 1 is a schematic top view showing the structure of the display device 1 according to the sixth embodiment. Figure 34 In the display device 1 according to the sixth embodiment, as in the fifth embodiment, a magnetic field is generated during the magnetic field generation period TGT using drive electrodes arranged parallel to the signal lines SL(0) to SL(p).

[0473] exist Figure 34 In, with Figure 31 Similarly, the portion related to the display panel 2 is shown. Figure 34 and Figure 31 Similar, so here we mainly explain the differences. Figure 31 In the display panel 2, a magnetic field is generated by supplying a predetermined voltage serving as a drive signal and a ground voltage Vss to a pair of drive electrodes during a magnetic field generation period TGT via a selection drive circuit SSU, which includes a drive circuit SU-R and a selection circuit SU-C. Therefore, voltage wirings TPL and TPH are arranged along side 2-U of the display panel 2, and the selection circuit SU-C is supplied with a ground voltage Vss and a predetermined voltage.

[0474] In this sixth embodiment, a selection drive circuit SSU-S is also arranged along the side 2-U of the display panel 2. The selection drive circuit SSU-S involved in this sixth embodiment includes a drive circuit SU-R and a selection connection circuit SU-S. The selection connection circuit SU-S is different from the selection circuit SU-C described in the fifth embodiment. During the magnetic field generation period TGT, the signal wiring arranged parallel to the signal lines SL(0) to SL(p) is connected to form a magnetic field generating coil. Here, the signal wiring arranged parallel to the signal lines SL(0) to SL(p) is equivalent to the voltage wiring arranged along the drive electrode and the sides 2-L and 2-R of the display panel 2.

[0475] Focusing on the voltage wiring TPH arranged between side 2-L of display panel 2 and side 900-L of module 900, and the voltage wiring TPL arranged between side 2-R of display panel 2 and side 900-R of module 900, in the fifth embodiment, these wirings are used to supply a predetermined voltage and ground voltage Vss to selection circuit SU-C. In contrast, in the sixth embodiment, although not particularly limited, voltage wirings TPL and TPH arranged along sides 2-L and 2-R of display panel 2 are also used as windings for the magnetic field generating coil.

[0476] <Selecting the Connection Circuit Configuration>

[0477] Figure 35 1 is a circuit diagram showing the configuration of a selection drive circuit SSU-S according to a sixth embodiment. Figure 35 This is a schematic diagram, but it is consistent with the actual configuration. Figure 35 In the process, the drive circuit SSD and the drive electrodes TL(0) to TL(6) are selected. Figure 32 The same, so the description is omitted.

[0478] Drive circuit SU-R and Figure 32Similarly, a plurality of unit drive circuits USU (0) to USU (6) are included. Each of the unit drive circuits USU (0) to USU (6) includes a shift section. The shift sections of each of the unit drive circuits USU (0) to USU (6) are connected in series, and the 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) are respectively set with the selection information SEI indicating selection, thereby outputting selection signals S50 to S56 indicating selection. For example, in the unit drive circuit USU (3), if the selection information SEI indicating selection is shifted from the previous unit drive circuit USU (2) and supplied, the 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). The fifteenth switches USW6(0) to USW(6) are connected between the drive electrodes TL(0) to TL(6), the voltage wiring TL(TPH) arranged along the side 2-L of the display panel 2, and the voltage wiring TL(TPL) arranged along the side 2-R of the display panel 2, with one drive electrode sandwiched between them. Figure 35 In the figure, voltage wiring TL(TPH) indicates a region of voltage wiring TPH arranged along side 2-L of display panel 2, and voltage wiring TL(TPL) indicates a region of voltage wiring TPL arranged along side 2-R of display panel 2. Voltage wirings TL(TPH) and TL(TPL) are arranged along side 2-L and side 2-R of display panel 2, respectively, and are therefore parallel to drive electrodes TL(0) to TL(6).

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

[0481] Similarly, the fifteenth switch USW6 (5) is connected between the end portions of one side of the drive electrode TL (4) and the drive electrode TL (6), and is controlled by a selection signal S55 from the unit drive circuit USU (5). The fifteenth switch USW6 (6) is connected between the end portion of one side of the drive electrode TL (5) and the voltage wiring TL (TPL), and is controlled by a selection signal S56 from the unit drive circuit USU (6).

[0482] In this sixth embodiment, during the magnetic field generation period TGT, when the unit drive circuit USU(0) outputs a selection signal S50 indicating selection, the unit drive circuit USD(1) outputs a selection signal S41 that turns on the thirteenth switch USW4 in the unit selection circuit UDC(1) and turns off the fourteenth switch USW5. The selection signal S50 turns on the fifteenth switch USW6(0), thereby connecting the voltage wiring TL(TPH) and the drive electrode TL(1) arranged in parallel to each other in series. As a result, a magnetic field generating coil is formed with the voltage wiring TL(TPH) and the drive electrode TL(1) forming a winding. Current flows through the series-connected voltage wiring TL(TPH) and the drive electrode TL(1), generating magnetic fields in the voltage wiring TL(TPH) and the drive electrode TL(1). The generated magnetic fields overlap in the region of the drive electrode TL(0) sandwiched between the voltage wiring TL(TPH) and the drive electrode TL(1), generating a strong magnetic field.

[0483] Next, when selection information SEI indicating selection is transferred to the unit drive circuit USU(1), the fifteenth switch USW6(1) is turned on by the selection signal S51. At this time, the unit drive circuit USD(0) outputs a selection signal S40 that turns on the fourteenth switch USW5 in the unit selection circuit UDC(0) and turns off the thirteenth switch USW4. Furthermore, the unit selection circuit UDC(2) outputs a selection signal S42 that turns on the thirteenth switch USW4 in the unit selection circuit UDC(2) and turns off the fourteenth switch USW5. Since the fifteenth switch USW6(1) is turned on, the drive electrodes TL(0) and TL(2) arranged in parallel with each other are connected in series, forming a magnetic field generating coil with these drive electrodes as windings. Furthermore, since current flows through the series-connected drive electrodes TL(0) and TL(2), a magnetic field is generated, and the generated magnetic field overlaps in the region of the drive electrode TL(1).

[0484] Subsequently, similarly, the fifteenth switch is turned on, and the two drive electrodes are connected in series. Current flows through the series-connected drive electrodes, generating a strong magnetic field. Furthermore, when the fifteenth switch USW6 (6) is turned on by a selection signal S56 from the unit drive circuit USU (6), a magnetic field generating coil is formed, with the drive electrode TL (5) and the voltage line TL (TPL) forming a winding. In this case, a strong magnetic field is generated in the region of the drive electrode TL (6).

[0485] exist Figure 35 In the description, the case where one drive electrode is sandwiched between the electrodes is described, but the present invention is not limited to this. For example, two or more drive electrodes may be sandwiched between the electrodes, or no drive electrode may be sandwiched between the electrodes. For example, when two drive electrodes are sandwiched between the electrodes, 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, when no electrodes are sandwiched between the electrodes, 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 may be the same as those in the fifth embodiment. In addition, electric field touch detection can also be realized in the same manner as in the fifth embodiment.

[0487] In this sixth embodiment, the voltage wiring TL (TPH) and TL (TPL) arranged outside the display panel 2 along the edge of the display panel 2 are also used as the windings of the magnetic field generating coil. Therefore, even in the portion of the display panel 2 close to the edge 2-L and the edge 2-R, the touch of the pen can be detected. Of course, only one side of the voltage wiring can be used as the winding of the magnetic field generating coil, and the voltage wiring TL (TPH) and TL (TPL) can also be used as the windings of the magnetic field generating coil. In addition, in Figure 35 In the description, the magnetic field generating coil having a primary winding is used as an example, but the magnetic field generating coil may also be a winding having 1.5 or more times.

[0488] In this specification, a drive wiring that generates a magnetic field during the magnetic field generation period TGT, such as a drive electrode, a signal line, or a scan line, has a pair of ends. The end of the other end (or the end of one side) of the pair of ends is relative to the end of one side (or the end of the other side) and exists in the extension direction of the drive wiring. When the magnetic field is generated, a drive signal is supplied to the end of one side (or the end of the other side), and a ground voltage Vss as a reference signal is supplied to the end of the other side (or the end of one side). When the end of one side and the end of the other side are regarded as the first area and the second area of the drive wiring, it can be regarded as that during the magnetic field generation period TGT, a drive signal is supplied to the first area (or the second area) of the drive wiring, and a reference signal is supplied to the second area (or the first area).

[0489] If the first embodiment is implemented Figure 8 For example, during the magnetic field generation period TGT, the drive wiring that generates the magnetic field is the drive electrodes TL(0) to TL(p) extending in the row direction, and the first region (second region) exists in a direction extending in the row direction relative to the second region (first region). Furthermore, when the plurality of drive electrodes TL(0) to TL(p) are considered as a plurality of drive wirings, during the magnetic field generation period TGT, one of a pair of drive electrodes selected by a selection signal from a unit drive circuit can be considered as the first drive wiring, and the other drive electrode can be considered as the second drive wiring. In this case, one end (e.g., the first region) of each of the first and second drive wirings is located on the same side (e.g., side 2-L) of the display panel 2, and the other end (the second region) of each is located on the same side (side 2-R) of the display panel 2. Therefore, the first regions (one end) of each of the first and second drive wirings are close to each other, and the second regions (the other end) of each of the first and second drive wirings are close to each other.

[0490] In addition, during the magnetic field generation period TGT, one or more drive wirings are sandwiched between the selected pair of drive wirings (in Figure 8 In the case of a middle driving electrode), the sandwiched driving wiring can be regarded as a third driving wiring. Figure 8 For example, if the driving electrodes TL(0) to TL(p) are considered driving wiring, the signal lines SL(0) to SL(p) extending in the column direction so as to intersect the driving electrodes TL(0) to TL(p) can be considered detection wiring. Of course, the detection wiring is not limited to the signal lines SL(0) to SL(p) but can also be the scanning lines GL(0) to GL(p) or the detection electrodes RL(0) to RL(p).

[0491] Those skilled in the art can conceive of various changes and modifications within the scope of the present invention, and it should be understood that those changes and modifications also fall within the scope of the present invention.

[0492] For example, any method obtained by those skilled in the art by appropriately adding, deleting or changing the design of the above-mentioned embodiments; or any method obtained by adding, omitting or changing the conditions of the processes, as long as it contains the purpose of the present invention, is included in the scope of the present invention.

[0493] For example, in the embodiment, 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 change according to the viewing angle of observation. 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 by changing the viewing angle of observation is also included in the scope of the present invention. In addition, the "parallel" used in this specification means extending from one end to the other end without intersecting. Therefore, even if a part or all of the lines on one side are set in a state of being inclined relative to the lines on the other side, as long as these lines do not cross from one end to the other end, in this specification, this state is also referred to as "parallel". In addition, in Figure 18 , an example is shown in which drive electrodes other than the drive electrodes generating an electric field are connected to the voltage wiring VCOM during electric field touch detection. However, the present invention is not limited thereto, and drive electrodes other than the drive electrodes generating an electric field may be placed in a floating state.

[0494] Description 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): Drive electrode; GL(0)~GL(p): Scan line; SL(0)~SL(p): Signal line; SSL, SSR, SSU, SSD, SSU-S: Selection drive circuit; SL-R, SR-R, SU-R, SD-R: Drive circuit; SL-C, SR-C, SU-C, SD-C: Selection circuit; SU-S: Selection connection circuit; SDC: Selection drive circuit; USL(0)~USL(p), USR(0)~USR(p), USU(0)~USU(p), USD(0)~USD(p): Unit drive circuit; TPL, TPH, VCOM: Voltage wiring; TSV: Signal wiring.

Claims

1. A display device comprising: A pixel array comprising a plurality of pixels arranged in a matrix form; a plurality of driving electrodes each extending in a first direction and arranged in a second direction intersecting the first direction in a detection area for detecting an external approaching object; a plurality of detection electrodes, each extending in the second direction and arranged in the detection area in the first direction; a first driving wiring, supplied with a driving signal having a periodically varying voltage, extending in the second direction so as to face one end portion of the plurality of driving electrodes, and supplying an AC voltage to the one end portion of the driving electrode; a second driving wiring supplied with a driving signal having a periodically varying voltage, extending in the second direction to face the other end portions of the plurality of driving electrodes, and supplying an AC voltage to the other end portions of the driving electrodes; a first reference voltage wiring line, to which a ground voltage is supplied in the case of magnetic field touch detection, extending in the second direction so as to face the one end portion of the plurality of drive electrodes and supplying a first reference voltage to the drive electrode, wherein the first reference voltage wiring line is positioned farther from the one end portion of the plurality of drive electrodes than the first drive wiring line; a second reference voltage wiring to which a ground voltage is supplied in the case of magnetic field touch detection, extending in the second direction so as to face the other end portion of the plurality of drive electrodes and supplying a second reference voltage to the drive electrodes, wherein the second reference voltage wiring is positioned farther from the other end portion of the plurality of drive electrodes than the second drive wiring; a plurality of first switch circuits for coupling the one end portion of the driving electrode to one of the first driving wiring and the first reference voltage wiring; and a plurality of second switch circuits for coupling the other end of the driving electrode to one of the second driving wiring and the second reference voltage wiring, When detecting an external object approaching, the first drive wiring is supplied with a drive signal, and the second reference voltage wiring is supplied with a ground voltage to generate a first magnetic field at the first drive electrode; the second drive wiring is supplied with a drive signal, and the first reference voltage wiring is supplied with a ground voltage to generate a second magnetic field at the second drive electrode; the first drive electrode and the second drive electrode are not adjacent to each other, the first magnetic field and the second magnetic field overlap, and the display device detects the magnetic field generated by the external object approaching through the multiple detection electrodes based on the overlapping magnetic fields.

2. The display device according to claim 1, wherein The plurality of driving electrodes include a driving electrode, wherein the other end of the driving electrode is coupled to the first reference voltage wiring and one end of the driving electrode is coupled to the first driving wiring via a first switching circuit, and the one end of the driving electrode is coupled to the second reference voltage wiring and the other end of the driving electrode is coupled to the second driving wiring via a second switching circuit.

3. The display device according to claim 2, wherein: The driving electrodes generate a magnetic field according to the AC voltage when detecting the external proximity object, and the detecting electrodes detect a magnetic field generated by the external proximity object in response to the magnetic field generated by the driving electrodes.

4. The display device according to claim 3, wherein The plurality of driving electrodes are arranged parallel to each other, The plurality of driving electrodes including the second driving electrode are arranged close to the first driving electrode, When detecting the external approaching object, one end of the first driving electrode is coupled to the first driving wiring and one end of the second driving electrode is coupled to the second reference voltage wiring. and when detecting the external approaching object, the other end of the first driving electrode is coupled to the first reference voltage and the other end of the second driving electrode is coupled to the second driving wiring, Thus, when the external approaching object is detected, the magnetic field generated by the first driving electrode and the magnetic field generated by the second driving electrode are superimposed on each other in the region between the first driving electrode and the second driving electrode.

5. The display device according to claim 4, wherein When the external approaching object is detected, a direction of current flowing into the second driving electrode is opposite to a direction of current flowing into the first driving electrode. The display device according to claim 5 , wherein: The plurality of driving electrodes include a third driving electrode disposed between the first driving electrode and the second driving electrode.

7. The display device according to claim 6, wherein: A plurality of stages of an operation of detecting the external approaching object are performed during a display period of one frame in the pixel array, the number of third drive wirings is set to a predetermined value in a predetermined stage, and the number of the third drive wirings is set to be less than the predetermined value in a stage after the predetermined stage.

8. The display device according to claim 6, wherein: The first driving electrode includes a plurality of driving electrodes arranged adjacent to each other, And the second driving electrode includes a plurality of driving electrodes arranged adjacent to each other.

9. The display device according to claim 3, further comprising: a plurality of signal lines that supply signals to the plurality of pixels when displaying, and a plurality of drive lines intersecting the plurality of signal lines are arranged in the pixel array, The plurality of driving electrodes include the plurality of driving lines, and the plurality of detecting electrodes include the plurality of signal lines.

10. The display device according to claim 3, wherein The pixel array includes a first substrate and a layer, a plurality of signal wirings are formed on the first substrate, and the layer is inserted between the first substrate and a second substrate arranged opposite to the first substrate, and the layer is replaced according to the signal to be displayed. The plurality of driving electrodes include the plurality of signal wirings formed on the first substrate, The plurality of detection electrodes include signal wirings formed on the second substrate.

11. The display device according to claim 3, wherein The pixel array includes a plurality of signal lines and a plurality of scan lines, the plurality of signal lines being arranged along each column of the pixel array and supplying signals to the plurality of pixels, and the plurality of scan lines being arranged along each row of the pixel array and supplying scan signals to the pixels arranged in the row to select the pixels. The plurality of driving electrodes include the plurality of signal lines or the plurality of scanning lines.

12. The display device according to claim 11, further comprising: A plurality of matrix electrodes are arranged in a dot matrix form in the pixel array; as well as A plurality of detection signal lines are connected to the plurality of matrix electrodes, The plurality of detection signal lines are arranged in parallel with the plurality of signal lines and detect the external approaching object based on a change in the amount of charge in the matrix electrodes.

13. The display device according to claim 12, further comprising: a first substrate on which the plurality of signal lines, the plurality of scanning lines, the plurality of detection signal lines and the plurality of matrix electrodes are formed; as well as a second substrate arranged to be opposite to the first substrate with a layer interposed between the first substrate and the second substrate, the layer being replaced according to the signal to be displayed, The plurality of detection electrodes include a plurality of signal wirings formed on the second substrate.

14. The display device according to claim 3, further comprising: A control circuit is coupled to the first drive wiring, the second drive wiring, the first reference voltage wiring, and the second reference voltage wiring, and supplies the AC voltage to the first drive wiring and the second drive wiring and supplies the first reference voltage and the second reference voltage to the first drive wiring and the second drive wiring when detecting the external approaching object.

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