Display device and device for detecting position of object

Abstract

The invention provides a display device and a device for detecting the position of an object. An apparatus for detecting a position of an object includes: a plurality of drive electrodes; a plurality of detection electrodes; a first drive wiring facing one end of the plurality of drive electrodes; a second drive wiring extending in the second direction and facing the other end portions of the plurality of drive electrodes; a first reference wiring extending in the second direction and facing the other end portions of the plurality of drive electrodes; a second reference wiring extending in the second direction and facing the one end portions of the plurality of drive electrodes; a plurality of first switching circuits coupled between the one end portions of the plurality of drive electrodes, the first drive wiring, and the second reference wiring; and a plurality of second switching circuits coupled among the other end portions of the plurality of drive electrodes, the second drive wiring, and the first reference wiring.

Description

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

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

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

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

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

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

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

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

[0009] Prior Art Documents

[0010] Patent Documents

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0059] Regardless of the electromagnetic induction method used, in order to realize a display device with touch detection function, a sensor board for receiving electromagnetic energy needs to be added, and the price (production cost) increases.

[0060] Furthermore, in methods that detect electrostatic capacitance using finger touch, a sensor board is also required to detect changes in capacitance. Therefore, to realize a display device with touch detection functionality, a sensor board needs to be added, and the price will increase.

[0061] To detect both pen touch and finger touch, separate sensor boards are required, further increasing the price. For example, one could consider using a portion of the sensor board used in electromagnetic induction and a portion of the sensor board used in capacitive induction to mitigate the price increase. However, this dual-use approach requires control for switching the dual-use section, complicating the control process. Furthermore, the increased control circuitry becomes a limitation in preventing further price increases.

[0062] The purpose of this invention is to provide a display device with touch detection function that can be manufactured to suppress price increases.

[0063] An embodiment of the present invention includes a display device comprising: a pixel arrangement having a plurality of pixels arranged in a matrix; a plurality of driving wires, configured to extend in a first direction in the pixel arrangement; and a plurality of detection wires, configured to extend in a second direction intersecting the first direction in the pixel arrangement. When an externally approaching object is detected, a periodically varying magnetic field driving signal is supplied to a first region and a reference signal is supplied to a second region extending in the first direction relative to the first region in a first driving wire. This generates a magnetic field corresponding to the magnetic field driving signal in the first driving wire. The magnetic field generated by the externally approaching object changes depending on whether the externally approaching object is near the first driving wire. The magnetic field generated by the externally approaching object is detected by the plurality of detection wires.

[0064] To generate a magnetic field, it is considered to construct a coil by electrically connecting, for example, two drive wires extending in a first direction. In this case, it is necessary to control the connection between the two drive wires. In contrast, in the display device according to one embodiment, it is not necessary to control the connection between the drive wires, thus simplifying control. Furthermore, the increase in the amount of control circuitry can be suppressed. As a result, it is possible to suppress the increase in the price of display devices with touch detection functionality.

[0065] Furthermore, in a display device according to an embodiment of the present invention, the aforementioned plurality of driving wires include a second driving wire configured to be close to the first driving wire. The second driving wire includes a first region close to the first region and a second region close to the second region. Here, when an external object is detected approaching, a reference signal is supplied to the first region of the second driving wire, and a magnetic field driving signal is supplied to the second region of the second driving wire. In this case, the magnetic field generated by the first driving wire and the magnetic field generated by the second driving wire overlap in the region between the first and second driving wires. This enhances the generated magnetic field.

[0066] Furthermore, an embodiment of the present invention includes a plurality of driving wires 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 for detecting external objects approaching the display area. This display device includes a first driving circuit connected to one end of each of the plurality of driving wires, and a second driving circuit connected to the other end of each of the plurality of driving wires. Here, the first driving circuit supplies a magnetic field driving signal to one end of the first driving wire arranged near the first side, and the second driving circuit supplies a reference signal to the other end of the first driving wire. At this time, the first driving circuit supplies a reference signal to one end of a second driving wire arranged closer to the second side than the first driving wire and configured to be spaced apart from the first driving wire by a third driving wire, and the second driving circuit supplies a magnetic field driving signal to the other end of the second driving wire.

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

[0068] By using a first driving circuit and a second driving circuit to move driving wires, which are respectively equivalent to the first driving wire and the second driving wire, from the first side to the second side, a magnetic field driving signal and a reference signal are supplied to the driving wires selected from a plurality of driving wires, thereby detecting external approaching objects approaching the display area during the display period of one frame in the display area.

[0069] This allows for the prevention of control from becoming complicated and the detection of external objects approaching the display area.

[0070] (Implementation Method 1)

[0071] The liquid crystal display device with touch detection function (hereinafter referred to as the display device) according to Embodiment 1 has two types of touch detection functions: one using electromagnetic induction and the other using electrostatic capacitance. That is, it can detect touches using a pen and touches using a finger. First, the principles of electromagnetic induction and electrostatic capacitance will be explained.

[0072] <Basic Principles of Electromagnetic Induction>

[0073] Figure 1 This is a schematic diagram illustrating the relationship between an electronic device with a display and a pen. Additionally, Figure 2 and Figure 3 It is a schematic diagram illustrating the basic principle of electromagnetic induction.

[0074] exist Figure 1 The electronic device includes a display device 1 housed within a metal casing, a light guide plate, a sensor plate, and a magnetic sheet. In the example shown, a sensor plate is mounted between the display device 1 and the metal casing. Multiple coils are disposed within this sensor plate, but... Figure 1 In the diagram, one of the coils is schematically represented as the coil inside the sensor board (hereinafter referred to as coil) L2.

[0075] Additionally, the pen, which is equivalent to an external object, contains a built-in coil and capacitor. Figure 1 In this diagram, the capacitor is omitted, but the coil built into the pen is schematically represented as the pen coil (hereinafter simply referred to as coil) L1. Coil L1 and coil L2 are coupled by a magnetic field.

[0076] It should be noted that, regarding display device 1, in order to schematically illustrate its structure, Figure 1 The diagram depicts a TFT glass substrate, a color filter, and a CF glass substrate included in the display device 1. The TFT glass substrate, though not shown, has multiple layers. A color filter is formed in the CF glass substrate, and a liquid crystal layer (not shown) is spaced between the color filter and the TFT glass substrate. Furthermore, a light guide plate is fixed by a fixing part, thus sandwiching it between the display device 1 and the sensor plate.

[0077] When a pen approaches (including touches) an electronic device, coil L1 approaches coil L2. This creates magnetic field coupling between coil L1 and coil L2, and the pen's approach is detected.

[0078] use Figure 2 and Figure 3 The test is explained. Figure 2 (A) indicates the state of the magnetic field generated by coil L2. Figure 2(B) indicates the state in which coil L1 generates a magnetic field.

[0079] exist Figure 2 In this circuit, the coil L1 inside the pen is connected in parallel with the capacitor element C inside the pen (hereinafter referred to as the capacitor element) to form a resonant circuit. The coil L2 inside the sensor board is exemplified by a primary winding coil and has a pair of terminals. When a touch is detected using the pen (touch detection), one terminal PT of coil L2 is connected to the output of transmitting amplifier AP1 for a predetermined time, and after the predetermined time, it is connected to the input of receiving amplifier AP2 for a predetermined time. Additionally, the other terminal of coil L2 inside the sensor board is connected to the ground voltage Vss during touch detection.

[0080] Figure 3 It is a waveform diagram representing 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) represents the waveform of the output of the receiving amplifier AP2.

[0081] When one terminal PT of coil L2 is connected to the output of transmitting amplifier AP1, a periodically varying transmitting signal IN is supplied to the input of transmitting amplifier AP1. Therefore, transmitting amplifier AP1 responds according to the changes in the transmitting signal IN, such as... Figure 3 As shown in (A), a periodically varying drive signal is supplied to one terminal of coil L2 for a predetermined time (the period during which the magnetic field is generated) TGT, thereby generating a magnetic field in coil L2. Figure 2 In (A), the magnetic field lines at this time are represented as

[0082] Magnetic field lines are generated around the winding of coil L2, thus the magnetic field inside coil L2 becomes stronger. If coil L1 is close to coil L2, for example... Figure 2 As shown in (A), the central axis LO of coil L1 exists inside coil L2, so the magnetic field lines of coil L2 reach coil L1. That is, coil L1 is positioned within the magnetic field generated in coil L2, and coils L1 and L2 are magnetically coupled. Coil L2 generates a periodically changing magnetic field according to the change of the driving signal. Therefore, through the mutual induction between coils L2 and L1, an induced voltage is generated in coil L1. The capacitor element C is charged using the induced voltage generated by coil L1.

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

[0084] During touch detection, specifically during the magnetic field generation period (TGT) and the magnetic field detection period (TDT), if the pen coil L1 approaches the sensor board coil L2, charging occurs in the capacitor C during TGT, and during TDT, the magnetic field lines of coil L1 reach coil L2. Since coil L1 and capacitor C form a resonant circuit, the magnetic field generated by coil L1 varies according to the time constant of the resonant circuit. This change in the magnetic field generated by coil L1 induces a voltage in coil L2. This induced voltage causes a signal change at terminal PT of coil L2. This signal change is used as a detection signal during TDT and amplified by the receiving amplifier AP2, outputting as the sensor signal OUT from the receiving amplifier AP2.

[0085] On the other hand, during touch detection, if the pen coil L1 approaches the sensor board coil L2, the capacitor C will not be charged or will have a reduced charge during the magnetic field generation period (TGT). Consequently, during the magnetic field detection period (TDT), the magnetic field lines generated by coil L1 cannot reach coil L2. Therefore, during TDT, the detection signal at one terminal PT of coil L2 remains unchanged.

[0086] exist Figure 3 In this context, the states represent the two states: when the internal coil L1 of the pen is close to the internal coil L2 of the sensor board, and when it is not close to the internal coil L2 of the sensor board. That is, in Figure 3 In the diagram, the left side represents the state when coil L1 is not close to coil L2, and the right side represents the state when coil L1 is close to coil L2. Therefore, in Figure 3 In (B), during the magnetic field detection period TDT shown on the left, the detection signal remains unchanged, while during the magnetic field detection period TDT shown on the right, the detection signal changes. By determining that a pen is present when the detection signal changes and that no pen is present when the detection signal remains unchanged, it is possible to detect pen touch.

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

[0088] <Basic Principles of Electrostatic Capacitive Method>

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

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

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

[0092] Between the first main surface TSF1 of the TFT glass substrate TGB and the second main surface CSF2 of the CF glass substrate CGB, there are multiple layers and liquid crystal layers, etc., but Figure 4 In the diagram, the driving electrodes TL(0) to TL(n+2), the liquid crystal layer, and the color filter are separated only by the first main surface TSF1 and the second main surface CSF2. Furthermore, in the first main surface CSF1 of the CF glass substrate CGB, as shown... Figure 4 As shown in (A), multiple detection electrodes RL(0) to RL(p) and a polarizing plate are configured. Figure 4 In (B), only the detection electrode RL(n) among the multiple detection electrodes RL(0) to RL(p) is represented as an example of a detection electrode.

[0093] In this instruction manual, such as Figure 4 As shown in (B), the display device 1 will be described from a top-view perspective, observing the state when viewed from the first main surfaces CSF1 and TSF1 of the CF glass substrate CGB and the TFT glass substrate TGB. That is, the top-view perspective is the state observed from 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 polarizing plate are disposed on the first main surface CSF1 side of the CF glass substrate CGB, if the viewing direction is changed, for example, the detection electrode and polarizing plate may be disposed on the right, left, or bottom side of the CF glass substrate CGB. Figure 4 In (B), 13 represents the amplifier circuit connected to the detection electrode RL(n).

[0094] When viewed from above from the first principal surface CSF1 and TSF1 side, as Figure 4 As shown in (A), in the first main surface TSF1 of the TFT glass substrate TGB, the driving electrodes TL(0) to TL(p) extend in the row direction (lateral direction) and are arranged parallel to each other in the column direction (vertical direction). Furthermore, as... Figure 4 As shown in (A), in 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 4 As shown in (B), the CF glass substrate CGB, liquid crystal layer, etc., are located between the driving electrodes TL(0)~TL(p) and the detection electrodes RL(0)~RL(p). Therefore, the driving electrodes TL(0)~TL(p) and the detection electrodes RL(0)~RL(p) cross when viewed from above, but are electrically separated from each other. Due to the capacitance between the driving electrodes and the detection electrodes, therefore... Figure 4In (B), the capacitor is shown as a capacitor element by a dashed 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] For the driving electrodes TL(0) to TL(p), a driving signal for display is supplied when display is active, and a driving signal for touch detection is supplied when touch is detected by finger touch.

[0097] In this first embodiment, an electric field is used to detect finger touch, and a magnetic field (see reference) is used. Figure 1 , Figure 2 and Figure 3 Touch detection is performed using a pen. Therefore, in this specification, touch detection using a magnetic field is referred to as magnetic field touch detection, and touch detection using an electric field is referred to as electric field touch detection. This will be explained later. However, for the drive electrodes TL(0) to TL(p), a drive signal for touch detection is also supplied during magnetic field touch detection. Therefore, during display, electric field touch detection, and magnetic field touch detection, corresponding drive signals are supplied to the drive electrodes TL(0) to TL(p). That is, during display, electric field touch detection, and magnetic field touch detection, the drive electrodes TL(0) to TL(p) are used together (shared). When viewed from the perspective of being used together, the drive electrodes TL(0) to TL(p) can be considered as common electrodes.

[0098] During electric field touch detection, a drive signal Tx for the electric field is supplied to the drive electrodes TL(0) to TL(p). For drive electrodes selected to detect touch, a signal with periodically varying voltage is supplied as the drive signal Tx; for drive electrodes not selected to detect touch, a predetermined fixed voltage is supplied as the drive signal Tx. During electric field touch detection, the drive electrodes TL(0) to TL(p) are selected sequentially, for example, in this order. Figure 4 In (A), it represents the state of supplying a signal whose voltage changes periodically as a driving signal Tx(2) to the driving electrode TL(2), for example, selecting driving electrodes sequentially from driving electrode TL(0) toward TL(p) and supplying driving signals whose voltage changes periodically.

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

[0100] Next, use Figure 5 The basic principle of electrostatic capacitance is explained. Figure 5In this context, TL(0)~TL(p) are Figure 4 The driving electrodes shown, RL(0)~RL(p) are Figure 4 The detection electrode is shown. In Figure 5 In (A), the driving electrodes TL(0) to TL(p) extend in the row direction and are arranged parallel to each other in the column direction. Additionally, the detection electrodes RL(0) to RL(p) extend in the column direction, intersecting the driving electrodes TL(0) to TL(p), and are arranged parallel to each other in the row direction. Figure 4 As shown in (B), a liquid crystal layer or the like is disposed 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 the unit drive electrode drivers 12-0 to 12-p. Additionally, 13-0 to 13-p schematically represent unit amplifier circuits. Figure 5 In (A), the pulse signal enclosed by the solid line ○ represents the waveform of the drive signal Tx supplied to the selected drive electrode. As an externally proximate object, the finger is shown as FG in this figure.

[0102] exist Figure 5 In example (A), a pulse signal is supplied from the unit drive electrode driver 12-2 to the drive electrode TL (2) as a drive signal Tx (2). By supplying the drive signal Tx (2) as a pulse signal to the drive electrode TL (2), thus achieving the desired effect... 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 a finger FG touches a position close to the driving electrode TL (2) of 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. Therefore, the amount of charge between the driving electrode TL (2) and the detection electrode RL (n) decreases. As a result, as... Figure 5 As shown in (C), the amount of charge generated in response to the supply of the drive signal Tx(2) is reduced by ΔQ when the finger FG touches the screen compared to when it is not touched. The difference in charge is represented as a voltage difference in the detection signal Rx(n), which is supplied to the unity amplifier circuit 13-n and amplified.

[0103] It should be noted that, in Figure 5In (C), the horizontal axis represents time, and the vertical axis represents charge. The charge increases in response to the rising edge of the drive signal Tx(2) (increasing upwards in this figure), and increases in response to the falling edge of the voltage of the drive signal Tx(2) (increasing downwards in this figure). At this time, the amount of charge increases changes depending on whether there is a touch from the finger FG. Furthermore, in this figure, a reset is performed after the charge increases upwards and before it increases downwards; similarly, a reset is performed after the charge increases downwards and before it increases upwards. Thus, the charge changes up and down based on the reset charge amount. In other words, a signal change is generated in the detection electrode RL(n) according to the touch.

[0104] Driving electrodes TL(0) to TL(p) are selected sequentially. Driving signals Tx(0) to Tx(p), which are pulse signals, are supplied to the selected driving electrodes. This results in the output of detection signals Rx(0) to Rx(p) from each of the multiple detection electrodes RL(0) to RL(p) that intersect with the selected driving electrodes. Each detection signal has a voltage value corresponding to whether the finger FG has touched or approached the position of each intersection. At the moment when a difference ΔQ is generated in the charge quantity, 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 construction of display device and sensor board coil>

[0106] The inventors considered that in such Figure 1 The diagram shows a display device 1 and a sensor board, respectively. Since the sensor board is expensive, the electronic device becomes expensive. Therefore, the inventors considered forming the coil L2 constituting the sensor board through a layer of the display device 1. Figure 1 This integrates the display device and the sensor board.

[0107] Figure 6 This is a schematic cross-sectional view of the display device 1 after the sensor board is integrated as a sensor layer. Figure 6 and Figure 1 Similarly, therefore, the main focus will be on explaining the differences. Figure 1 Alternatively, a sensor plate can be prepared independently of the display device 1, and the sensor plate can be placed between the light guide plate and the magnetic sheet. In contrast, in... Figure 6 In (A), a sensor layer is formed on the CF glass substrate CGB. Additionally, in Figure 6 In (B), a sensor layer is formed on the TFT glass substrate TGB. Therefore, since the sensor layer, which is equivalent to a sensor plate, is provided on the display device 1, it is possible to suppress price increases.

[0108] As in Figure 2 and Figure 3 The description states that during the magnetic field generation period (TGT), coil L2 inside the sensor board generates a magnetic field; during the magnetic field detection period (TDT), coil L2 inside the sensor board detects the magnetic field generated by coil L1 inside the pen. That is, coil L2 inside the sensor board serves both as the generator and the detector of the magnetic field. Under this dual function, in... Figure 6 In (A), coil L2 is formed by a layer formed in the CF glass substrate CGB. Similarly, in Figure 6 In (B), coil L2 is formed by a layer formed on the TFT glass substrate TGB.

[0109] However, it is also possible to separately construct a coil that generates a magnetic field in the TGT during magnetic field generation and a coil that detects the magnetic field in the TDT during magnetic field detection. In this case, for example, it is possible to... 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), through... Figure 6 The sensor layer shown in (A) constitutes a coil for detecting the magnetic field (hereinafter also referred to as a magnetic field detection coil). Furthermore, multiple layers exist within the TFT glass substrate TGB that can be used as sensor layers. Therefore, it is also possible to... Figure 6 The sensor layer shown in (B) consists of a magnetic field generating coil and a magnetic field detection coil, respectively.

[0110] Figure 7 This illustrates examples where a magnetic field generating coil and a magnetic field detection coil are respectively configured. Figure 7 The text indicates that a magnetic field generating coil and a magnetic field detection coil are formed by layers created in the TFT glass substrate TGB. Figure 7 In this context, CX(n) to CX(n+2) represent, for example, magnetic field generating coils, and CY(n) to CY(n+2) represent magnetic field detection coils. Figure 7 In Figure 4 The driving electrodes TL(0) to TL(p) described herein are used as layers constituting the magnetic field generating coil, and the signal lines SL(0) to SL(p) that transmit image information are used as layers constituting the magnetic field detection coil. Regarding the signal lines SL(0) to SL(p), as will be explained later, they are similarly constructed from layers formed in the TFT glass substrate TGB. Figure 7 In the middle, it extends vertically and is arranged in parallel horizontally.

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

[0112] Similarly, during the magnetic field detection TDT, one end of each of signal lines SL(n+1) and SL(n+2) and one end of each of signal lines SL(n+6) and SL(n+7) are electrically connected, and the other end of each of signal lines SL(n) to SL(n+2) and the other end of each of signal lines SL(n+6) to SL(n+8) are electrically connected. This allows the formation of a coil CY(n) with signal lines SL(n) to SL(n+2) and SL(n+6) to SL(n+8) forming a triple-wound coil. Likewise, by electrically connecting predetermined signal lines during the magnetic field detection TDT, triple-wound coils CY(n+1), CY(n+2), etc., can be constructed.

[0113] Coils CX(n) to CX(n+2) and coils CY(n) to CY(n+2) are crossed in an electrically isolated state. For example, one end of the driving electrode TL(n) constituting coil CX(n) is equivalent to Figure 2 The terminal PT shown is supplied with magnetic field from TGT during the generation of the magnetic field. Figure 1 The output of the transmitting amplifier AP1, as shown, supplies a ground voltage Vss to the other end of the drive electrode TL(n+8). Thus, as in Figure 2 As described in (A), a magnetic field is generated in the coil CX(n). This magnetic field, generated in the coil CX(n), affects the capacitance element C(n) within the pen. Figure 2 ) accumulates charge.

[0114] During the magnetic field detection (TDT), predetermined signal lines are electrically connected to form coils CY(n) to CY(n+2). Through the charge accumulated in the capacitor element C within the pen, coil L1 ( Figure 1 A magnetic field is generated. This magnetic field is detected by coils CY(n) to CY(n+2). Therefore, it is possible to detect whether a pen is approaching, the area it is approaching, and the distance to the pen.

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

[0116] In the electromagnetic induction method, prior to this invention, the inventors studied the configuration of a display device that uses a magnetic field to generate a coil. Figure 36 and Figure 37 This is a block diagram illustrating the configuration of a display device previously studied by the inventor. Here, a magnetic field generating coil is used in conjunction with... Figure 7 Similarly, the case of using driving electrodes will be explained.

[0117] exist Figure 36 and Figure 37 In this diagram, TL(n) to TL(n+5) represent the driving electrodes. Additionally, USR(n) to USR(n+5) and USL(n) to USL(n+5) represent the unit driving circuits. Figure 36 and Figure 37 In this context, VCOM represents the voltage wiring that supplies power to the ground voltage Vss, TSV represents the signal wiring that supplies the periodically changing drive signal TSVCOM, and CNR and CNL represent the signal wiring that connects the drive electrodes in TGT during magnetic field generation.

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

[0119] Each of the switches constituting the first switch group, SL11, SL21, SL31, SL41, SL51, and SL61, becomes a first switch, and each first switch is connected to one end of the signal wiring TSV and its corresponding drive electrode. Furthermore, each of the switches constituting the first switch group, SL12, SL22, SL32, SL42, SL52, and SL62, becomes a second switch, and each second switch is connected to one end of the voltage wiring VCOM and its corresponding drive electrode. Moreover, each of the switches constituting the first switch group, SL13, SL23, SL33, SL43, SL53, and SL63, becomes a third switch, and each third switch is connected to one end of the signal wiring CNL and its corresponding drive electrode.

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

[0121] Here, SR11, SR21, SR31, SR41, SR51, and SR61, which constitute the second switch group, also become first switches, and each first switch is connected to the signal wiring TSV and the other end of the corresponding drive electrode. Additionally, SR12, SR22, SR32, SR42, SR52, and SR62, which constitute the second switch group, become second switches, and each second switch is connected to the voltage wiring VCOM and the other end of the corresponding drive electrode. Furthermore, SR13, SR23, SR33, SR43, SR53, and SR63, which constitute the second switch group, become third switches, and each third switch is connected to the signal wiring CNL and the other end of the corresponding drive electrode.

[0122] Each of the unit drive circuits USL(n) to USL(n+5) corresponds to each of the drive electrodes TL(n) to TL(n+5), and each of the unit drive circuits USR(n) to USR(n+5) also corresponds to each of the drive electrodes TL(n) to TL(n+5). When magnetic field touch detection and electric field touch detection are performed, each of the unit drive circuits USL(n) to USL(n+5) and USR(n) to USR(n+5) controls the first switch group and the second switch group, thereby generating magnetic and electric fields in the corresponding drive electrodes.

[0123] That is, when a magnetic field is generated in the corresponding driving electrode, the first switch group and the second switch group are controlled by selecting two driving electrodes that are separated from each other. A coil is formed by the selected two driving electrodes, and the corresponding driving electrode is disposed inside the coil. Thus, a strong magnetic field is generated in the region of the corresponding driving electrode. Conversely, when an electric field is generated in the corresponding driving electrode, the first switch group and the second switch group are controlled by selecting the corresponding driving electrode.

[0124] <<Magnetic Field Touch Detection>>

[0125] Taking the case where a magnetic field is generated in the region of the driving electrode TL(n+2) when a magnetic field touch detection is performed as an example, the operation will be explained as follows. The driving electrodes separated from the driving electrode TL(n+2) are driving electrodes TL(n+1) and TL(n+3). The unit driving circuits USL(n+2) and USR(n+2) corresponding to the driving electrode TL(n+2) control the first switch group (SL21, SL22, SL23), (SL41, SL42, SL43) and the second switch group (SR21, SR22, SR23), (SR41, SR42, SR43) corresponding to the driving electrodes TL(n+1) and TL(n+3) separated from the driving electrode TL(n+2).

[0126] That is, the unit drive circuit USL(n+2) turns the first switch SL21 and the second switch SL42 in the first switch group (SL21, SL22, SL23) and (SL41, SL42, SL43) to the ON state (conducting state), and turns the remaining switches to the OFF state (non-conducting state). Additionally, the unit drive circuit USR(n+2) turns the third switches SR23 and SR43 in the second switch group (SR21, SR22, SR23) and (SR41, SR42, SR43) to the ON state (conducting state), and turns the remaining switches to the OFF state (non-conducting state).

[0127] Therefore, as Figure 36As shown, one end of the driving electrode TL(n+1) is connected to the signal wiring TSV via the first switch SL21, and the other end of the driving electrode TL(n+1) is connected to the signal wiring CNR via the third switch SR23. Similarly, one end of the driving electrode TL(n+3) is connected to the voltage wiring VCOM via the second switch SL42, and the other end of the driving electrode TL(n+3) is connected to the signal wiring CNR via the third switch SR43. As a result, the other ends of the driving electrodes TL(n+1) and TL(n+3), which are arranged in parallel with driving electrode TL(n+2) in between, are electrically connected via the signal wiring CNR, thereby forming a coil with driving electrode TL(n+2) as the innermost element.

[0128] In the case of magnetic field touch detection, during the magnetic field generation period TGT, a ground voltage Vss is supplied to the voltage wiring VCOM, and a drive signal TSVCOM with periodically changing voltage is supplied to the signal wiring TSV. Therefore, the drive signal TSVCOM is supplied as the magnetic field drive signal to one end of the drive electrode TL(n+1) via the first switch SL21, and the ground voltage Vss is supplied to one end of the drive electrode TL(n+3) via the second switch SL42. As a result, a magnetic field is generated by the magnetic field generating coil composed of 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 the diagram, arrows I1 and I2 represent the current flowing through the drive electrodes TL(n+1) and TL(n+3) via the drive signal TSVCOM, and their direction. Drive electrode TL(n+1) generates a magnetic field, indicated by the dashed arrow, through the flow of current I1. The direction of current I2 flowing through drive electrode TL(n+3) is opposite to the direction of current I1, thus drive electrode TL(n+3) generates a magnetic field, also indicated by the dashed arrow. In drive electrode TL(n+2), a strong magnetic field is generated by superimposing the magnetic fields generated by drive electrode TL(n+1) and drive electrode TL(n+3).

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

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

[0132] Through a shift operation, the state of the selected information when it arrives at the unit drive circuits USL(n+3) and USR(n+3) is determined. Figure 37 The diagram shows the actions taken when selection information reaches the unit drive circuits USL(n+3) and USR(n+3), and the... Figure 36 The actions described in the previous text are the same, therefore the explanation is omitted.

[0133] In this way, by selecting information shift, the driving electrodes that generate a strong magnetic field are also switched (moved) in sequence.

[0134] <<Electric Field Touch Detection>>

[0135] Next, the operation of electric field touch detection will be explained. Here, the driving electrode TL(n+2) will also be used as an example.

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

[0137] In electric field touch detection, a drive signal TSVCOM with periodically varying voltage is supplied to the signal wiring TSV. Therefore, for the drive electrode TL(n+2), the drive signal TSVCOM is supplied from both ends via the first switches SL31 and SR31 as the electric field drive signal. At this time, the remaining first switch group and the first, second, and third switches in the second switch group are in the open state. Therefore, the drive electrodes TL(n) to TL(n+1) and TL(n+3) to TL(n+5) are in the floating state.

[0138] If the selection information is moved from the unit drive circuits USL(n+2) and USR(n+2) to the unit drive circuits USL(n+3) and USR(n+3) via a shift operation, then the unit drive circuits USL(n+3) and USR(n+3) control the first switch group and the second switch group connected to the corresponding drive electrode TL(n+3) in the same manner as described above. Therefore, a 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, to form a magnetic field generating coil, as described above, it is required to connect multiple driving electrodes arranged in parallel to each other via signal wiring (CNR, CNL) and a third switch. Furthermore, in this case, the switch group connected to the driving electrodes controls a different driving electrode from the driving electrode located in the region generating the strong magnetic field. On the other hand, in the case of electric field touch detection, the switch group connected to the driving electrodes controls the driving electrode located in the region generating the electric field. Therefore, this creates a technical problem of complex control. Moreover, it also creates a technical problem of increased footprint for the driving circuit (control circuit) used for control.

[0141] <Overall Structure of Display Devices>

[0142] Figure 8 This is a block diagram illustrating the configuration of the display device 1 according to Embodiment 1. Here, although not particularly limiting, the case where the display device 1 is a liquid crystal display device will be used as an example for explanation. Figure 8 In this design, 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. Additionally, display device 1 includes selection drive circuits (first drive circuit and second drive circuit) SSR, SSL, switching adjustment circuit SCX, and amplifier circuit AMP. These devices and circuits included in display device 1 will be described in detail later; therefore, an overall overview is provided here.

[0143] Display panel 2 is used at the rear. Figure 12 The present invention describes a pixel-array LCD with multiple pixels arranged in a matrix. The pixel-array LCD includes multiple signal lines, multiple driving electrodes, and multiple scan lines. Here, the signal lines are arranged in their respective columns, the driving electrodes are arranged in their respective rows, and the multiple scan lines are arranged in their respective rows. For example, in... Figure 8 As described, signal wiring extends vertically (column direction) and is arranged parallel horizontally (row direction). Additionally, drive electrodes extend horizontally and are arranged parallel vertically. Furthermore, scan lines extend horizontally and are arranged parallel vertically. In this case, pixels are positioned at the intersection of signal lines and scan lines. During display, pixels are selected via the signal lines and scan lines. The voltage of the signal lines and the voltage of the drive electrodes (display drive signal) are applied to the selected pixels, and the selected pixels display based on the voltage difference between the signal lines and the drive electrodes.

[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 timing signals supplied to the external terminal Tt and image information supplied to the input terminal Ti, forming an image signal Sn based on the image information supplied to the input terminal Ti, and supplies this image signal to the signal line driver D-DRV. The signal line driver D-DRV, during the display period, supplies the supplied image signal Sn to the signal line selector 3 using time-division multiplexing. Additionally, the control circuit D-CNT receives timing signals supplied to the external terminal Tt and control signals SW from the touch control device 6, forming various control signals. These control signals formed by the control circuit D-CNT include selection signals SEL1 and SEL2 supplied to the signal line selector 3, a synchronization signal TSHD, a clock signal CLK, a magnetic field enable signal SC_EN, an electric field enable signal TC_EN, a drive signal TSVCOM, a touch detection-related control signal Y-CNT, and the clock signal CLK.

[0145] The signals generated by the control circuit D-CNT include the magnetic field enable signal SC_EN, which enables magnetic field touch detection, and the electric field enable signal TC_EN, which enables electric field touch detection. Additionally, the synchronization signal TSHD identifies the period during which display is performed on the display panel 2 (display period) and the period during which touch detection (magnetic field touch detection and electric field touch detection) is performed (touch detection period). The drive signal TSVCOM, whose voltage changes periodically during touch detection, is supplied to the drive electrodes as either a magnetic field drive signal or an electric field drive signal.

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

[0147] The touch control device 6 includes: a detection circuit DET that receives sensing signals S(0) to S(p); a processing circuit PRS that processes the detection signal DET-D from the detection circuit DET to extract the coordinates of the touched position; and a control circuit T-CNT. The control circuit T-CNT receives 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 to operate synchronously with the display control device 4.

[0148] That is, the control circuit T-CNT controls the operation of the detection circuit DET and the processing circuit PRS when the synchronization signal TSHD, the magnetic field enable signal SC_EN, and the electric field enable signal TC_EN indicate touch detection. Additionally, the control circuit T-CNT receives the detection signal from the detection circuit DET, generates a control signal SW, and supplies it to the control circuit D-CNT. The processing circuit PRS uses the extracted coordinates as coordinate information and outputs it from the external terminal To.

[0149] The display panel 2 has sides 2-U and 2-D parallel to the rows of the pixel-arranged LCD, and sides 2-R and 2-L parallel to the columns of the pixel-arranged LCD. Here, sides 2-U and 2-D are opposite to each other, configured such that multiple driving electrodes and multiple scan lines of the pixel-arranged LCD are sandwiched between these two sides. Additionally, sides 2-R and 2-L are also opposite to each other, configured such that multiple signal lines of the pixel-arranged LCD are sandwiched between these two sides.

[0150] The selection drive circuit SSR is configured along edge 2-R of the display panel 2, and the selection drive circuit SSL is configured along edge 2-L of the display panel 2. The selection drive circuit SSR, located on edge 2-R of the display panel 2, is coupled to multiple drive electrodes configured within the display panel 2, and the selection drive circuit SSL, located on edge 2-L of the display panel 2, is coupled to the multiple drive electrodes configured within the display panel 2. In other words, the selection drive circuits SSR and SSL are located outside the display panel 2 and connected to the drive electrodes configured within the display panel 2.

[0151] The selector circuit SSR includes a driver circuit SR-R and a selector circuit SR-C. The driver circuit SR-R includes a shift register with multiple shift segments. The selector information SEI is set in the shift register via the control signal Y-CNT. The set selector information SEI is shifted sequentially in sync with the clock signal CLK.

[0152] When magnetic field touch detection is specified via 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 particularly limiting, 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 when electric field touch detection is specified via 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 particularly limiting, in this first embodiment, if electric field touch detection is specified, the drive circuit SR-R generates one 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 to the signal wiring (magnetic field drive signal wiring) TSV and the voltage wiring (reference signal wiring) VCOM via the drive electrode specified by the selection signal. That is, when magnetic field touch detection is performed, the drive electrode specified by one of the two selection signals is connected to the signal wiring TSV, and the drive electrode specified by the other selection signal is connected to the voltage wiring VCOM. Conversely, when electric field touch detection is performed, the drive electrode specified by one selection signal is connected to the signal wiring TSV.

[0154] In this first embodiment, when magnetic field touch detection is performed, a ground voltage Vss is supplied to the voltage wiring VCOM. Additionally, when both magnetic field and electric field touch detection are performed, a drive signal TSVCOM with periodically changing voltage is supplied to the signal wiring TSV. Therefore, when magnetic field touch detection is performed, a drive signal TSVOM is supplied as the magnetic field drive signal to the drive electrode specified by one of the two selection signals via the selection circuit SR-C. At this time, a ground voltage Vss is supplied to the drive electrode specified by the other selection signal via the selection circuit SR-C.

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

[0156] The selection driver circuit SSL has the same configuration as the selection driver circuit SSR. That is, the selection driver circuit SSL includes a driver circuit SL-R and a selection circuit SL-C. The driver circuit SL-R includes a shift register with multiple shift segments. Selection information SEI is set in the shift register according to the control signal Y-CNT. The set selection information is shifted sequentially in sync with the clock signal CLK.

[0157] When magnetic field touch detection is specified via the magnetic field enable signal SC_EN, the driver 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 driver circuit SL-R generates two selection signals based on the selection information. Conversely, even when electric field touch detection is specified via the electric field enable signal TC_EN, the driver 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 driver circuit SR-R generates only one 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 to the signal wiring TSV and the voltage wiring VCOM via the drive electrode specified by the selection signal. That is, when a magnetic field touch is detected, the drive electrode specified by one of the two selection signals is connected to the voltage wiring VCOM, and the drive electrode specified by the other selection signal is connected to the signal wiring TSV. Conversely, when an electric field touch is detected, the drive electrode specified by one selection signal is connected to the signal wiring TSV.

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

[0160] In addition, when electric field touch detection is performed, the drive signal TSVCOM is supplied as the 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 operate synchronously by supplying the same clock signal CLK and the same control signal Y-CNT to the selection drive circuits SSR and SSL.

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

[0163] Therefore, currents corresponding to the voltage changes of the magnetic field drive signal (drive signal TSVCOM) flow through the two designated drive electrodes, generating magnetic fields in each drive electrode. Furthermore, the directions of the flowing currents are opposite to each other, so the magnetic fields formed in the region sandwiched between the two drive electrodes overlap, resulting in a strong magnetic field.

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

[0165] A switching adjustment circuit SCX is configured along edge 2-U of the display panel 2, and on edge 2-U side, the switching adjustment circuit SCX is connected to multiple signal lines configured in the display panel 2. That is, the switching adjustment circuit SCX is connected to multiple signal lines outside the display panel 2. In addition, the amplifier circuit AMP is connected to multiple signal lines configured in the display panel 2 via a signal line selector 3 configured along edge 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 parallel to each other are connected on side 2-U, multiple coils are formed, making the signal lines the primary winding coils of the winding. The ends of each coil are on side 2-D and connected to the amplifier circuit AMP via the signal line selector 3. The primary winding coils function as magnetic field detection coils. That is, during magnetic field detection, TDT (… Figure 2 In the magnetic field generated by the pen, a signal change is produced in the magnetic field detection coil formed by the signal lines. This signal change is amplified by the amplifier circuit AMP and output as the sensing signals S(0) to S(p), which are then supplied to the detection circuit DET.

[0167] In addition, when the electric field touch is detected, the signal lines are not connected by the switching adjustment circuit SCX. Therefore, the amplifier circuit AMP amplifies the signal changes of the signal lines according to whether or not a finger touches the screen, and supplies them to the detection circuit DET as sensing signals S(0)~S(p).

[0168] The detection circuit processes the supplied sensing signals S(0) to S(p) and supplies them to the processing circuit PRS. Therefore, when magnetic field touch detection occurs, the processing circuit PRS determines whether a pen touch was used, the coordinates of the touch, and the pen pressure, and outputs this information from the external terminal To. Conversely, when electric field touch detection occurs, the processing circuit PRS determines whether a finger touch was used, the coordinates of the touch, and outputs this information from the external terminal To.

[0169] Here, the case where the magnetic field detection coil is a primary winding is explained, but it is not limited to this. It is also possible to connect three or more signal lines in series to form a coil with a winding of 1.5 or more by setting the same function as the switching adjustment circuit SCX in the amplifier circuit AMP.

[0170] <Module Composition of Display Device 1>

[0171] Figure 9 This is a schematic top view showing the overall configuration of the module 900 with the display device 1 installed. Although it is a schematic diagram, Figure 9It is depicted in conjunction with the actual configuration. In this figure, 901 indicates that... Figure 4 The region in the TFT glass substrate TGB represented in the figure, 902 indicates that it has a region in the TFT glass substrate TGB. Figure 4 The regions shown are those of the TFT glass substrate TGB and the CF glass substrate CGB. In module 900, the TFT glass substrate TGB is integrated. That is, in regions 901 and 902, the TFT glass substrate TGB is shared, and in region 902, as shown... Figure 4 As shown, a CF glass substrate CGB is also formed on the surface above the TFT glass substrate TGB.

[0172] exist Figure 9 In the diagram, 900-U represents the short side of module 900, and 900-D is an edge of module 900, representing the short side opposite to the short side 900-U. Additionally, 900-L represents the long side of module 900, and 900-R is an edge of module 900, representing the long side opposite to the long side 900-L.

[0173] In region 902, and in the region between side 2-L of display panel 2 and long side 900-L of module 900, there is a [missing information - likely a device or structure]. Figure 8 The gate driver 5 and the selection drive circuit SSL are shown in the diagram. Additionally, in the area between edge 2-R of the display panel 2 and the long side 900-R of the module 900, a [missing information - likely a component or element] is configured. Figure 8 The selection drive circuit SSR is shown in the figure. A circuit is arranged in the area between 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 is shown in the figure.

[0174] Additionally, a [feature / equipment] is arranged in the area between edge 2-D of display panel 2 and short edge 900-D of module 900. Figure 8 The signal line selector 3, amplifier circuit AMP, and driving semiconductor device DDIC are shown.

[0175] In this first implementation method, Figure 8 The signal line driver D-DRV and control circuit D-CNT shown are integrated into a single semiconductor device. In this specification, this single semiconductor device is referred to as the driver semiconductor device DDIC. Furthermore, Figure 8 The touch control device 6 shown is also integrated into a semiconductor device. In this specification, to distinguish it from the driving semiconductor device DDIC, the semiconductor device with the built-in 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, an amplifier circuit AMP can also be integrated into, for example, the driving semiconductor device DDIC.

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

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

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

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

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

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

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

[0183] <Display Panel Structure>

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

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

[0186] In explanationFigure 11 Previously, regarding Figure 11 The reference numerals for the signal lines used are explained below. Signal lines SL(0) to SL(p) represent the signal lines that transmit color image signals during display. Each signal line has three signal lines that transmit image signals to three sub-pixels. Figure 11 In the diagram, the corresponding sub-pixel is labeled with an English letter after the symbol on the signal line to distinguish the three signal lines. Taking signal line SL(n) as an example, signal line SL(n) has signal lines SL(n)R, SL(n)G, and SL(n)B. Here, the English letter R after the symbol SL(n) indicates the signal line that transmits image signals to the sub-pixel corresponding to the red (R) primary color during display; the English letter G after the symbol SL(n) indicates the signal line that transmits image signals to the sub-pixel corresponding to the green (G) primary color; and the English letter B after the symbol SL(n) indicates the signal line that transmits image signals to the sub-pixel corresponding to the blue (B) primary color.

[0187] exist Figure 11 In the text, 1100 indicates the TFT glass substrate (in...) Figure 4 (TGB). A first wiring layer (metal wiring layer) 1101 is formed in the TFT glass substrate 1100. Scan lines GL(n) are formed by 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. Signal lines SL(n)R, SL(n)G, SL(n)B, SL(n+1)R, SL(n+1)G, SL(n+1)B, and SL(n+2)R, SL(n+2)G are formed by wiring formed in the second wiring layer 1103. In this figure, in order to show that these signal lines are formed by the second wiring layer 1103, the reference numeral 1103 for the second wiring layer is written in [] after the reference numeral for the signal line. 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. A driving electrode TL(n) and an auxiliary electrode SM are formed by wiring in the third wiring layer 1105. Here, the driving electrode TL(n) is a transparent electrode (first electrode). The auxiliary electrode SM (second electrode) is formed with a lower resistance value than the driving electrode TL(n) and is electrically connected to the driving electrode TL(n). Although the driving electrode TL(n), being a transparent electrode, has a relatively high resistance value, the combined resistance can be reduced by electrically connecting the auxiliary electrode SM to the driving electrode TL(n). Here, the reference numeral

[1105] on the drawing of the driving electrode and the auxiliary electrode also indicates 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 this configuration, CR, CB, and CG are color filters. A liquid crystal layer 1107 is placed between the color filters CR (red), CG (green), and CB (blue) and the insulating layer 1106. Here, the pixel electrode LDP is located at the intersection of the scan line and the signal line, and a color filter CR, CG, or CB corresponding to each pixel electrode LDP is placed above each pixel electrode LDP. A black matrix BM is placed between each color filter CR, CG, and CB.

[0190] In addition, Figure 11 The text is omitted, and on color filters CR, CG, and CB, as shown... Figure 4 as well as Figure 6 As shown, a CF glass substrate CGB is formed thereon. Furthermore, on the CF glass substrate CGB, as... 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 display panel 2 will be explained. Figure 12 It means Figure 8 and Figure 9 The circuit diagram shown is of the circuit configuration of display panel 2. Even in Figure 12 In China, it is also used with Figure 11The same display format represents the signal lines. In this figure, multiple SPixes, represented by single-dotted lines, each represent a liquid crystal display element (sub-pixel). The sub-pixels SPixes are arranged in a matrix in the display panel 2, constituting a liquid crystal element arrangement (pixel arrangement) LCD. The pixel arrangement LCD includes multiple scan lines GL(0) to GL(p) arranged in each row and extending in the row direction, and signal lines SL(0)R, SL(0)G, SL(0)B to SL(p)R, SL(p)G, SL(p)B arranged in each column and extending in the column direction. 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 This section only represents the pixel arrangement related to scan lines GL(n-1) to GL(n+1), 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 drive electrodes TL(n-1) to TL(n+1). Figure 12 For ease of explanation, this is represented as configuring drive electrodes TL(n-1) to TL(n+1) in each row, but a single drive electrode can also be configured for multiple rows.

[0194] Each sub-pixel SPix arranged at the intersection of rows and columns of a pixel-arranged LCD includes a TFT transistor Tr formed in a TFT glass substrate 1100 and a liquid crystal element LC with one terminal connected to the source of the TFT transistor Tr. In the pixel-arranged LCD, the gates of the TFT transistor Tr of multiple sub-pixels SPix arranged in the same row are connected to scan lines arranged in the same row, and the drains of the TFT transistor Tr of multiple sub-pixels SPix arranged in the same column are connected to signal lines arranged in the same column. In other words, multiple sub-pixels SPix are arranged in a matrix, with scan lines arranged in each row, and multiple sub-pixels SPix arranged in the corresponding row connected to the scan lines. In addition, signal lines are arranged in each column, and pixel SPix arranged in the corresponding column are connected to the signal lines. Furthermore, the other end of the liquid crystal element LC of the multiple sub-pixels SPix arranged in the same row is connected to a driving electrode arranged in the row.

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

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

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

[0198] Although not specifically restricted, the TFT transistor Tr in each sub-pixel SPix is ​​an N-channel TFT transistor. For scan lines GL(0) to GL(p), from the gate driver 5 ( Figure 8 and Figure 9The system supplies pulse-shaped scan line signals that sequentially become high-level according to this sequence. That is, in a pixel-arranged LCD, the voltage of the scan lines sequentially becomes high-level from the scan line GL(0) arranged in the upper row to the scan line GL(p) arranged in the lower row. Consequently, in a pixel-arranged LCD, the TFT transistor Tr in the sub-pixel SPix sequentially becomes on (conducting) from the sub-pixel SPix arranged in the upper row to the sub-pixel SPix arranged in the lower row.

[0199] When the TFT transistor Tr is turned on, the image signal supplied to the signal line at this time is supplied to the liquid crystal element LC via the TFT transistor in the on state. In the liquid crystal element LC, the electric field changes due to the voltage difference between the voltage of the display driving signal supplied to the driving electrodes TL(0) to TL(p) and the voltage of the supplied image signal, and the modulation of the light transmitted 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, SL(p)B is displayed on the display panel 2 in sync with the scan line signal supplied to the scan lines GL(0) to GL(p).

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

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

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

[0203] In a pixel-arranged LCD, along the second side of a pair of sides parallel to the row, i.e., the shorter side 2-D of one side of the display panel 2, as shown... Figure 9As shown, a signal selector 3, an amplifier AMP, and a driving semiconductor device DDIC are configured. In the pixel-arranged LCD, on this 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, SL(p)B via the signal line selector 3.

[0204] Additionally, along the first side of the LCD pixel arrangement, that is, the other side of the display panel 2 (short side 2-U), such as 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 (the third side and the fourth side) of a pair of sides parallel to the column, i.e., the long side 2-L of the display panel 2. In this pixel-array LCD, scan line signals from the gate driver 5 are supplied to the scan lines GL(0) to GL(p) on this third side. Figure 9 In this display panel 2, a gate driver 5 is arranged along the long side 2-L. ​​However, the gate driver 5 can also be divided into two, arranged along the long side 2-L (the third side of the pixel-array LCD) and the long side 2-R (the fourth side of the pixel-array LCD). Furthermore, in the pixel-array LCD, during display, a display drive signal is supplied to the drive electrode from the selection drive circuit SSL on the third side. Moreover, during magnetic field generation (TGT) for magnetic field touch detection, or during electric field touch detection, a magnetic field drive signal or an electric field drive signal is supplied to the designated drive electrode from the selection drive circuit SSL on this third side.

[0206] Along the fourth side of the LCD pixel arrangement, i.e., the long side 2-R of the display panel 2, such as... Figure 9 As shown, a selection drive circuit SSR is configured. During display, a display drive signal is supplied from the selection drive circuit SSR to the common electrode on this fourth side. On the other hand, during magnetic field touch detection or electric field touch detection, similarly to the selection drive circuit SSL described above, a magnetic field drive signal or an electric field drive signal is also supplied from this fourth side to the designated drive electrode.

[0207] Although the pixel-arranged LCD that displays color in display panel 2 has been specifically described, it can also be considered as a pixel-arranged LCD composed of multiple color pixels Pix (pixels) each consisting of three sub-pixels SPix. In this view, multiple pixel Pixes are arranged in a matrix to form a pixel-arranged LCD. In each row of the pixel-arranged LCD formed by the pixel Pixes, corresponding scan 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 considered as one pixel Pix, and the pixel Pix is ​​considered to have the same structure as the sub-pixels SPix. The select terminals of each pixel Pix, arranged in a matrix in the pixel-arranged LCD, are connected to scan lines GL(0) to GL(p) arranged in the same row as the pixel Pix. One terminal of each pixel Pix is ​​connected to signal lines SL(0) to SL(p) arranged in the same column, and the other terminal of each pixel Pix is ​​connected to drive electrodes TL(0) to TL(p) arranged in the same column. Alternatively, one drive electrode can correspond to multiple rows of the pixel-arranged LCD. In this case, the other terminals of the pixel Pix arranged in multiple rows are connected to a common drive electrode.

[0209] Thus, even when an LCD is considered to be composed of multiple pixels (Pixes), Figure 8 and Figure 9 The configuration of the display panel 2 shown, and Figure 12 The circuit diagram shown corresponds to the content previously described.

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

[0211] <Selecting the drive circuit>

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

[0213] <<Summary of the Actions of Selecting the Drive Circuit>>

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

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

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

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

[0218] Each of the unit drive circuits USR(0) to USR(p) and USL(0) to USL(p) corresponds to each of the drive electrodes TL(0) to TL(p) arranged parallel to each other. However, the unit drive circuits and drive electrodes may not have a one-to-one correspondence. That is, multiple drive electrodes arranged adjacent to each other may also correspond to the unit drive circuit. Figure 13 The example shown illustrates six driving electrodes corresponding to a unit driving circuit. That is, six driving electrodes TL(n)-1 to TL(n)-6, which are close to and adjacent to each other, are considered 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 driving circuits USR(n) and USL(n) generate a selection signal for a specified corresponding driving electrode TL(n), then the end of each of the specified driving electrode TL(n), i.e., one of the six driving electrodes TL(n)-1 to TL(n)-6, is located at edge 2-L(n). Figure 8 , Figure 9 On the ) side, it is connected to the signal wiring TSV. Additionally, the other end of each of the specified drive electrodes TL(n), i.e., the six drive electrodes TL(n)-1 to TL(n)-6, is on side 2-R( Figure 8 , Figure 9 On the [side], it is connected to the signal wiring TSV. When electric field touch detection occurs, a drive signal TSVCOM with periodically changing voltage is supplied to the signal wiring TSV. Therefore, the drive signal TSVCOM is supplied to both ends of the drive electrodes TL(n), that is, the six drive electrodes TL(n)-1 to TL(n)-6, as the electric field drive signal. As a result, an electric field is generated according to the electric field drive signal (drive signal TSVCOM).

[0220] On the other hand, during the magnetic field generation period TGT of magnetic field touch detection, if the unit drive circuits USR(n) and USL(n) generate a selection signal for a specified corresponding drive electrode TL(n), then the drive electrodes TL(n-1) and TL(n+1), configured to sandwich the specified drive electrode TL(n), i.e., 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 constructed from six drive electrodes TL(n-1)-1 to TL(n-1)-6, and the drive electrode TL(n+1) is also constructed from six drive electrodes TL(n+1)-1 to TL(n+1)-6. Figure 13In this context, only the driving electrodes TL(n-1)-5, TL(n-1)-6, TL(n+1)-1, and TL(n+1)-2 are represented, while the remaining driving electrodes TL(n-1)-1 to TL(n-1)-4 and TL(n+1)-3 to TL(n+1)-6 are omitted.

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

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

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

[0224] In this way, a strong magnetic field can be generated even without connecting the drive electrodes TL(n-1) and TL(n+1), which are configured in parallel, in series to form a coil. As a result, control becomes easier, and the increase in the area occupied by the control circuit can be suppressed.

[0225] <<Selection of the configuration of the drive circuit>>

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

[0227] Select the driver circuit SSL, such as Figure 8 As shown, it includes a drive circuit SL-R and a selection circuit SL-C. The drive circuit SL-R includes multiple unit drive circuits USL(0) to USL(p) corresponding to the drive electrodes TL(0) to TL(p), respectively. The selection circuit SL-C includes multiple third switches and fourth switches, and a switch control circuit SWL, each corresponding to the drive electrodes TL(0) to TL(p). Figure 14 In the diagram, TL(n) to TL(n+5) represent the driving electrodes TL(0) to TL(p), and the section of the selection driving circuit SSL corresponding to these driving electrodes TL(n) to TL(n+5) is also represented. The selection driving circuit SSL will be explained below using the section corresponding to the driving electrodes TL(n) to TL(n+5) as an example.

[0228] exist Figure 14In this diagram, USL(n) to USL(n+5) are unit drive circuits corresponding to drive electrodes TL(n) to TL(n+5). Each unit drive circuit USL(n) to USL(n+5) includes 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 unit drive circuit USL(n) from the unit drive circuit USL (not shown) at the front end of unit drive circuit USL(n). Synchronously with the clock signal CLK, the selection information SEI is shifted in the shift register formed by the shift segments of unit drive circuits USL(n) to USL(n+5), moving from unit drive circuit USL(n) towards unit drive circuit USL(n+5). In addition, when the selection information SEI moves, selection signals are output from the unit drive circuits USL(n) to USL(n+5) to the switch control circuit SWL respectively.

[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), forming 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 the driving electrodes TL(n) to TL(n+5). For example, the third switch STLn and the fourth switch SVLn correspond to the driving electrode TL(n), and the third switch STLn+5 and the fourth switch SVLn+5 correspond to the driving electrode TL(n+5). The remaining third and fourth switches also correspond one-to-one with the driving electrodes in the same way.

[0231] The third switches STLn to STLn+5 are located on the edge 2-L side of the display panel 2, connected between the signal wiring TSV and one end of the corresponding drive electrode TL(n) to TL(n+5), and are controlled by a first drive signal. Similarly, the fourth switches SVLn to SVLn+5 are located on the edge 2-L side of the display panel 2, connected between the voltage wiring VCOM and one end of the corresponding drive electrode TL(n) to TL(n+5), and are controlled by a second drive signal. Taking the third switches STLn and STLn+5 and the fourth switches SVLn and SVLn+5 as examples, the third switch STLn is located on the edge 2-L side, connected between the signal wiring TSV and one end of the drive electrode TL(n), and the fourth switch SVLn is located on the edge 2-L side, connected between the voltage wiring VCOM and one end of the drive electrode TL(n). Additionally, the third switch STLn+5 is located on side 2-L, connected between one end of the signal wiring TSV and the drive electrode TL(n+5), and the fourth switch SVLn+5 is located on side 2-L, connected between one end of the voltage wiring VCOM and the drive electrode TL(n+5). The remaining third and fourth switches are the same.

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

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

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

[0235] The drive circuit SR-R, composed of 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 as follows: Figure 8 As shown, they are arranged along edge 2-R of display panel 2. Therefore, the fifth switches STRn to STRn+5 are respectively located on edge 2-R and connected between the signal wiring TSV and the other end of the corresponding drive electrodes TL(n) to TL(n+5). In addition, the sixth switches SVRn to SVRn+5 are respectively located on edge 2-R and connected between the voltage wiring VCOM and the other end of the corresponding drive electrodes TL(n) to TL(n+5).

[0236] Taking the fifth switches STRn and STRn+5 and the sixth switches SVRn and SVRn+5 as examples, the fifth switch STRn is located on side 2-R, connected between the signal wiring TSV and the other end of the drive electrode TL(n). Similarly, the sixth switch SVRn is located on side 2-R, connected between the voltage wiring VCOM and the other end of the drive electrode TL(n). Likewise, the fifth switch STRn+5 is located on side 2-R, connected between the signal wiring TSV and the other end of the drive electrode TL(n+5), and the sixth switch SVRn+5 is located on side 2-R, connected between the voltage wiring VCOM and the other end of the drive electrode TL(n+5). The remaining fifth and sixth switches are connected in the same way.

[0237] In magnetic field touch detection, during the magnetic field generation period TGT, a periodically varying drive signal TSVCOM is supplied to the signal wiring TSV. Simultaneously, a ground voltage Vss is supplied to the voltage wiring VCOM. Figure 15This is a waveform diagram showing the voltage supplied to the signal wiring TSV and the voltage wiring VCOM during the magnetic field generation period (TGT). Figure 15 In the diagram, the horizontal axis represents time t, and the vertical axis represents voltage. Figure 15 (A) represents the waveform of the drive signal TSVCOM supplied to the signal wiring TSV configured in the selection circuit SL-C. Figure 15 (B) represents the waveform of the drive signal TSVCOM supplied to the signal wiring TSV configured in the selection circuit SR-C. Additionally, Figure 15 (C) represents the voltage waveform of the voltage wiring VCOM configured 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 the voltage values ​​change periodically between the ground voltage Vss and the predetermined voltage (first voltage) Vp. In contrast, the ground voltage Vss is supplied to the voltage wiring VCOM.

[0239] When electric field touch detection, such as 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 specifically limited, the predetermined voltage Vp in the drive signal TSVCOM differs during magnetic field generation (TGT) and electric field touch detection. Furthermore, Figure 15 The period of the drive signal TSVCOM shown in (A) and (B) is 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 this and can be the same.

[0240] The switch control circuits SWL and SWR perform different actions depending on whether magnetic field touch detection is specified by the magnetic field enable signal SC_EN or electric field touch detection is specified by the electric field enable signal TC_EN. Figure 16 and Figure 17 This section describes the actions required for magnetic field touch detection, using... Figure 18 The actions for cases where electric field touch detection is specified are explained.

[0241] <<Actions Generated by a Magnetic Field>>

[0242] Figure 16 and Figure 17 It is a schematic top view indicating the action of specifying magnetic field touch detection.

[0243] When a selection signal supplied from the unit drive circuit indicates selection, the switch control circuit SWL controls the third and fourth switches by connecting two drive electrodes, arranged apart from the drive electrodes of the unit drive circuit that output the selection signal, to the signal wiring TSV and the voltage wiring VCOM. Although not particularly limiting, in this first embodiment, the switch control circuit SWL controls the third switch such that the drive electrode closest to side 2-U is connected to the signal wiring TSV, and the switch control circuit SWL controls the fourth switch such that the drive electrode closest to side 2-D is connected to the voltage wiring VCOM.

[0244] Similarly, when the selection signal supplied from the unit drive circuit indicates selection, the switch control circuit SWR controls the sixth and fifth switches by connecting two drive electrodes, arranged apart from the drive electrodes of the unit drive circuit that output the selection signal, to the voltage wiring VCOM and the signal wiring TSV. In this first embodiment, the switch control circuit SWR controls the sixth switch such that the drive electrode closest to side 2-U is connected to the voltage wiring VCOM, and the switch control circuit SWL controls the fifth switch such that the drive electrode closest to side 2-D is connected to the signal wiring TSV.

[0245] The shift registers constructed using unit drive circuits USL(n) to USL(n+5) and the shift registers constructed using unit drive circuits USR(n) to USR(n+5) operate synchronously with each other. Therefore, one end of the shift register is connected to the drive electrode of the signal wiring TSV via the switch control circuit SWL, while the other end is connected to the voltage wiring VCOM via the switch control circuit SWR. Furthermore, in the case where the other end of the shift register SWR is connected to the drive electrode of the signal wiring TSV, one end is connected to the voltage wiring VCOM via the switch control circuit SWL.

[0246] exist Figure 15In the diagram, the state of the unit drive circuits USL(n+2) and USR(n+2) when they output selection signals indicating selection is shown. The drive electrode corresponding to the unit drive circuits USL(n+2) and USR(n+2) is drive electrode TL(n+2). Therefore, two drive electrodes arranged with a gap between them are called drive electrodes TL(n+1) and TL(n+3). The switch control circuit SWL turns on the third switch STLn+1 via a first drive signal, connecting the end of drive electrode TL(n+1) located near edge 2-U to the signal wiring TSV. At this time, the switch control circuit SWL turns on the fourth switch SVLn+3 via a second drive signal, connecting the end of drive electrode TL(n+3) located near edge 2-D to the voltage wiring VCOM.

[0247] Additionally, at this time, the switch control circuit SWL is controlled by the first drive signal to make the remaining third switches STLn, STLn+2 to STLn+5, except for the third switch STLn+1, open. Similarly, the switch control circuit SWL is controlled by the second drive signal to make the remaining fourth switches SVLn to SVLn+2, SVLn+4 to SVLn+5, except for the fourth switch SVLn+3, open.

[0248] On the other hand, the switch control circuit SWR connects the other end of the drive electrode TL(n+1) located near edge 2-U to the voltage wiring VCOM, thereby turning on the sixth switch SVRn+1 via the fourth drive signal. At this time, the switch control circuit SWR connects the other end of the drive electrode TL(n+3) located near edge 2-D to the signal wiring TSV, thereby turning on the fifth switch STRn+3 via the third drive signal.

[0249] Additionally, at this time, the switch control circuit SWR is controlled by the third drive signal to make the remaining fifth switches STRn~STRn+2 and STRn+4~STRn+5, except for the fifth switch STRn+3, open. Similarly, the switch control circuit SWR is controlled by the fourth drive signal to make the remaining sixth switches SVRn and SVRn+2~SVRn+5, except for the sixth switch SVRn+1, open.

[0250] Therefore, in the two drive electrodes arranged in a manner that sandwiches the drive electrode TL(n+2), one end of the drive electrode TL(n+1) is connected to the signal wiring TSV, and the other end is connected to the voltage wiring VCOM. Meanwhile, in the other drive electrode TL(n+3), one end is connected to the voltage wiring VCOM, and the other end is connected to the signal wiring TSV. For example... Figure 16 As shown, by supplying a periodically varying drive signal TSVCOM to the signal wiring TSV, and supplying a ground voltage Vss to the voltage wiring VCOM, a current flows through the drive electrode TL(n+1). Figure 17 The arrow indicates the current I1, and the arrow indicates the current I2 flowing through the driving electrode TL(n+3).

[0251] By flowing current I1, a magnetic field (represented by the dashed arrow) is generated in the driving electrode TL(n+1). Conversely, by flowing current I2 in the opposite direction to current I1 in the driving electrode TL(n+3), a magnetic field (represented by the dashed arrow) is generated in the driving electrode TL(n+3). The driving electrode TL(n+2) is sandwiched between driving electrodes TL(n+1) and TL(n+3), thus, in the region of driving electrode TL(n+2), two magnetic fields overlap, generating a strong magnetic field. Furthermore, at this time, the driving electrodes TL(n), TL(n+2), TL(n+4), and TL(n+5), other than driving electrodes TL(n+1) and TL(n+3), are in a floating state.

[0252] The selection information SEI, indicating the selection, is shifted by the shift clock CLK, moving 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 moves the region generating the strong magnetic field from the drive electrode TL(n+2) to the drive electrode TL(n+3). Figure 17 This indicates the state in which a strong magnetic field is generated in the driving electrode TL(n+3).

[0253] The selection information SEI, indicating the selected state, is moved to the unit drive circuits USL(n+3) and USR(n+3) by the change of the clock signal CLK. The drive electrode corresponding to these 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 positioned closer to side 2-U than the drive electrode TL(n+3), to the signal wiring TSV and the voltage wiring VCOM. Additionally, at this time, the switch control circuits SWL and SWR connect the drive electrode TL(n+4), which is positioned closer to 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 with the first drive signal, turns on the fourth switch SVLn+4 with the second drive signal, and turns off the remaining third and fourth switches. In addition, the switch control circuit SWR turns the fifth switch SVRn+2 on through the third drive signal, turns the sixth switch STRn+4 on through the fourth drive signal, and turns the remaining fifth and sixth switches off.

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

[0255] By flowing currents I1 and I2, a magnetic field, as indicated by the dashed arrow, is generated in the driving electrode TL(n+2), and a similar magnetic field, as indicated by the dashed arrow, is generated in the driving electrode TL(n+4). In the region of the driving electrode TL(n+3), these overlapping magnetic fields generate a strong magnetic field. Furthermore, 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), become floating.

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

[0257] <<Actions Generated by an Electric Field>>

[0258] When the 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 by connecting the drive electrode corresponding to the unit drive circuit that outputs the selection signal indicating selection to the signal wiring TSV, when the selection signal supplied from the unit drive circuit indicates selection. Unlike the generation of a magnetic field, no direct current needs to flow through the drive electrode to generate an electric field; therefore, the switch control circuits SWL and SWR keep the fourth and sixth switches in the off state.

[0259] Figures 15-18 This is a schematic top view illustrating the actions under specified electric field touch detection conditions. In this diagram, the state of the unit drive circuits USL(n+2) and USR(n+2) when they output a selection signal indicating the selected state is shown.

[0260] In the switch control circuit SWL, if a selection signal indicating selection is supplied from the unit drive circuit USL(n+2), the third switch STLn+2, which is connected between the end of the drive electrode TL(n+2) corresponding to the unit drive circuit USL(n+2) and the signal wiring TSV, is turned on by the first drive signal. Furthermore, the switch control circuit SWL at this time controls the other third switches STLn to STLn+1 and STLn+3 to STLn+5 (excluding the third switch STLn+2) to be turned off by the first drive signal.

[0261] In the switch control circuit SWR, if a selection signal indicating selection is supplied from the unit drive circuit USR(n+2), the fifth switch STRn+2, which is connected between the other end of the drive electrode TL(n+2) corresponding to the unit drive circuit USR(n+2) and the signal wiring TSV, is turned on by the third drive signal. 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, through the second and fourth drive signals, enable the fourth switch SVLn+2 and the sixth switch SVRn+2, which are connected to the drive electrode TL(n+2) that generates the electric field, to be in the ON state.

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

[0264] The selection information SEI, indicating the shift of the clock signal CLK, moves 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 time, the third switch (excluding STLn+3) and the fifth switch (excluding STRn+3) are off. This generates an electric field corresponding to the drive signal TSVCOM in the drive electrode TL(n+3), which is positioned next to the drive electrode TL(n+2).

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

[0266] exist Figure 13 The example shown illustrates how a third, fourth, fifth, and sixth switch are connected to a single driving electrode, but it is not limited to this. For example, it could also be like... Figure 16 As shown, a third switch, a fourth switch, a fifth switch, and a sixth switch are connected to six (or more) drive electrodes arranged adjacent to each other.

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

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

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

[0270] <Composition of the switching adjustment circuit>

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

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

[0273] In Implementation Method 1, a signal line is used to form a magnetic field detection coil during TDT (Time-to-Time) magnetic field detection.

[0274] exist Figure 19 In this diagram, the driving electrodes used to generate the magnetic field during the magnetic field generation period (TGT) are omitted; during the magnetic field detection period (TDT), only the signal lines constituting the magnetic field detection coil are depicted. During TDT, the signal lines are used to detect the magnetic field and can therefore be considered as detection electrodes. Under this observation, in Figure 19 In this context, it can be considered that only the detection electrode is described.

[0275] exist Figure 19 In the process, the coil L1 inside the pen generates a magnetic field based on the charge of the capacitor element C, which is charged by the voltage induced by the magnetic field during the magnetic field generation period TGT. Figure 10 In the diagram, SL(0) to SL(p) represent signal lines. Signal lines SL(0) to SL(p) are defined as follows: Figure 19 As indicated in the diagram, the signal lines SL(0) to SL(p) intersect with the driving electrodes TL(0) to TL(p). That is, signal lines SL(0) to SL(p) are arranged parallel to each other between sides 2-R and 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 edge 2-L of the display panel 2, and a magnetic field signal line SL(dR) is arranged along edge 2-R of the display panel 2. That is, it includes: a magnetic field signal line SL(dR) (second signal line) located outside the active area of ​​the display panel 2, and arranged along edge 2-R parallel to the signal lines SL(0) to SL(p) (first signal lines); and a magnetic field signal line SL(dL) (second signal line) located outside the active area of ​​the display panel 2, and arranged along edge 2-R parallel to the signal lines SL(0) to SL(p). Since the magnetic field signal lines SL(dR) and SL(dL) are outside the active area of ​​the display panel 2, they do not contribute to the display but are used for magnetic field touch detection.

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

[0278] Although not specifically restricted, signal lines SL(0) to SL(p) are arranged in this order from side 2-L to side 2-R of display panel 2. In this first embodiment, during magnetic field detection (TDT), the signal lines arranged with two signal lines spaced apart are connected by the eighth switches k00 to kp. Figure 19 For example, the eighth switch k00 is connected between the end of signal line SL(1) and the end of signal line SL(4), and the eighth switch k01 is connected between the end of signal line SL(3) and the end of signal line SL(6). In addition, the eighth switch kn-1 is connected between the end of signal line SL(n-2) and the end of signal line SL(n+1), the eighth switch kn is connected between the end of signal line SL(n) and the end of signal line SL(n+3), and the eighth switch kn+1 is connected between the end of signal line SL(n+2) and the end of signal line SL(n+5).

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

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

[0281] The seventh switches j00 and j01, and the eighth switches k00 to kp are controlled by the magnetic field enable signal SC_EN. In this first embodiment, the seventh switches j00 and j01, and the eighth switches k00 to kp are in the ON state when the magnetic field enable signal SC_EN specifies magnetic field touch detection, and in the OFF state at other times.

[0282] As a result, when the magnetic field touches the sensor, a connection is made between the two signal lines separated by a middle section. If... Figure 19For example, signal lines SL(1) and SL(4), which are separated by signal lines SL(2) and SL(3), are electrically connected by the eighth switch k00. Similarly, signal lines SL(3) and SL(6), which are separated by signal lines SL(4) and SL(5), are connected by the eighth switch k01; signal lines SL(n-2) and SL(n+1), which are separated by signal lines SL(n-1) and SL(n), are connected by the eighth switch kn-1; signal lines SL(n) and SL(n+3), which are separated by signal lines SL(n+1) and SL(n+2), are connected by the eighth switch kn; and signal lines SL(n+2) and SL(n+5), which are separated by signal lines SL(n+3) and SL(+4), are connected by the eighth switch kn+1.

[0283] Furthermore, signal line SL(p-6) and signal line SL(p-3) which are configured with signal lines SL(p-5) and SL(p-4) in between are connected by an eighth switch kp-1, and signal line SL(p-4) and signal line SL(p-2) which are configured with signal lines SL(p-3) and SL(p-2) in between are connected by an eighth switch kp.

[0284] In this first embodiment, the magnetic field signal line SL(dL) and the signal line SL(2) are connected by a seventh switch j00, and the magnetic field signal line SL(dR) and the signal line SL(p-1) and the signal line SL(p-2) are connected by a seventh switch j01.

[0285] Therefore, during TDT (Time-to-Time) magnetic field detection, a magnetic field detection coil is formed using any of the signal lines SL(0) to SL(p). In Embodiment 1, a magnetic field detection coil can also be formed near edges 2-R and 2-L of the display panel 2 during TDT. That is, the magnetic field signal line SL(dL) and 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 near edge 2-L of the display panel 2 as the inner side can be formed. Similarly, the magnetic field signal line SL(dR) and 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 near edge 2-R of the display panel 2 as the inner side can be formed. Therefore, detection is possible even when the pen is near edge 2-R and edge 2-L. ​​In addition, in this Embodiment 1, as from Figure 8 It is understood that the resulting magnetic field detection coils overlap each other. This prevents 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). This helps to prevent the border from becoming too large.

[0287] During TDT (Time-to-Device) magnetic field detection, a ground voltage Vss is supplied to one terminal of a pair of terminals of each magnetic field detection coil formed through the signal line, and the other terminal is connected to... Figure 19 The amplifier circuit AMP is connected as described in the diagram. If... Figure 14 For example, the ends of signal lines SL(n-2), SL(n), and SL(n+2) are connected to the amplifier circuit AMP. If the magnetic field from the pen reaches the magnetic field detection coil formed by the signal lines, an induced voltage is generated in the magnetic field detection coil, and the input signal of the amplifier circuit AMP changes. The amplifier circuit AMP amplifies this change in the input signal and outputs it as the sensing signals S(0) to S(p).

[0288] On the other hand, in electric field touch detection, the seventh switches j00 and j01 and the eighth switches k00 to kp are in the open state. When electric field touch detection is performed, if... Figure 18 as well as Figure 20 The description explains that the driving electrode generates an electric field. Depending on whether a finger touches the signal, the electric field in the signal line changes, and this change is transmitted to the amplifier circuit AMP for amplification, and output as the sensing signal S(0)~S(p).

[0289] In the first embodiment, an example is shown where magnetic field signal lines SL(dR) and SL(dL) are provided along the two sides of the display panel 2 to form the magnetic field detection coil as a winding, but of course, they can also be provided on one side.

[0290] Figure 20 This is a perspective view schematically illustrating the configuration of the display device 1 according to Embodiment 1. In this view, driving electrodes TL(0) to TL(p), signal lines SL(0) to SL(p), eighth switches k00 to kp, driving semiconductor device DDIC, selection driving circuit SSR, SSL, and gate driver 5 are shown. They are formed in the TFT glass substrate TGB. Therefore, it can also be considered as... Figure 20 In the middle, it represents the display device 1 installed in the module. Additionally, in... Figure 19 The text also indicates that the pen includes coil L1.

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

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

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

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

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

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

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

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

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

[0300] During TDT (Time-to-Device Transmission) in magnetic field detection, such as in Figure 20The description states that the eighth switches k00 to kp are in the ON state. This forms multiple coils that make signal lines SL(0) to SL(p) windings. Through the mutual induction between the coils that make the signal lines windings and the coil L1 inside the pen, an induced voltage is generated in the coils that make the signal lines windings, transmitting the signal in the signal lines 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 21 In the diagram, solid lines marked with arrows represent the signals transmitted to the ninth switch ln via signal line SL(n). Thus, when the driving electrode that generates the magnetic field is activated, the coordinates touched by the pen can be determined by identifying the detection electrode that detects the magnetic field.

[0301] An example has been described where magnetic field signal lines SL(dL) and SL(dR) are positioned outside the active area of ​​the display panel 2, but this is not a limitation. For example, magnetic field signal lines SL(dL) and / or SL(dR) may be positioned along edges 2-L and 2-R within the active area of ​​the display panel 2, respectively. In this case, by making the width d10 of the positioned magnetic field signal lines SL(dL) and / or SL(dR) narrower than the width d11 of the signal lines, the narrowing of the display area can be reduced.

[0302] <Variation Example>

[0303] Figure 21 This is a perspective view schematically showing the display device 1 involved in a variation of Embodiment 1. Figure 20 and Figure 20 Similarly, therefore the main explanation is related to Figure 20 The differences. Figure 20 In the display device 1 shown, when magnetic field touch detection is performed, a magnetic field detection coil is formed via signal lines SL(0) to SL(p). Additionally, when electric field touch detection is performed, 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 magnetic field touch detection is performed. Furthermore, even when electric field touch detection is performed, the detection electrodes RL(0) to RL(p) are used to detect changes in the electric field. That is, instead of... Figure 4 The signal lines SL(0) to SL(p) are shown, and when magnetic field touch detection and electric field touch detection are performed, 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 21As shown, the main surface CSF1 of the CF glass substrate CGB is formed. Therefore, detection electrodes RL(0) to RL(p) are formed on the driving electrodes TL(0) to TL(p) through the liquid crystal layer, the color filter, and the CF glass substrate CGB. When viewed from the main surface CSF1 side of the CF glass substrate CGB, the driving and detection electrodes RL(0) to RL(p) are arranged to be parallel to each other and orthogonal to the electrodes TL(0) to TL(p).

[0305] exist Figure 20 In this embodiment, the ends of each of the detection electrodes RL(0) to RL(p) are connected to each other at predetermined intervals. In this modified example, with Figure 21 Similarly, the signal lines SL(0) to SL(p) shown are connected to one end of each of the detection electrodes RL(0) to RL(p) at an interval similar to that between two detection electrodes. This connection is achieved by connecting the detection electrodes through signal wiring formed in the CF glass substrate CGB. Figure 21 In order to facilitate the observation of the attached figures, only the detection electrodes RL(0) to RL(p), and the detection electrodes RL(0) to RL(6), RL(n), RL(n+3), and RL(p-3) to RL(p) are labeled with the attached figures. Figure 21 For example, on the 900-U side of the module, the ends of detection electrodes RL(1) and RL(4) are connected. Additionally, the ends of detection electrodes RL(3) and RL(6) are connected. It should be noted that one end of detection electrode RL(2) is sandwiched between detection electrode TL(1) and connected to the end of detection electrode RL(0) closest to the 900-L side of the module. Regarding the ends of the other detection electrodes, except for detection electrode RL(p-3), the ends are connected with a gap of two detection electrodes between them.

[0306] The other end of each of the detection electrodes RL(0) to RL(p) is connected to the ninth switches l00 to lp formed in the TFT glass substrate TGB. Figure 20 In order to represent the connection between the detection electrodes RL(0)~RL(p) and the ninth switches l00~lp, the ninth switches l00~lp are depicted on the CF glass substrate CGB, but with… Figure 20 Similarly, the ninth switches 100-1p are formed on the TFT glass substrate TGB. Furthermore, the ninth switches 100-1p are connected to the... Figure 21 The example shown is similarly covered by a semiconductor device called DDIC. Figure 21 In the TFT glass substrate TGB, the driving semiconductor device DDIC is represented by a dashed line.

[0307] Figure 20 The ninth switch l00~lp shown is... Figure 20 Similarly, the ninth switches l00 to lp shown are constructed using the first and second groups. During the magnetic field detection TDT, the ninth switches of the first group are turned on, thereby supplying a ground voltage Vss to the end 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 end of the magnetic field detection coil to the amplifier circuit AMP.

[0308] In this variant, also during the TGT period when the magnetic field is generated, with Figure 20 Similarly, a magnetic field is generated by driving electrodes TL(0) to TL(p). If the pen generates a magnetic field during the magnetic field detection period (TDT) based on the generated magnetic field, the magnetic field is detected by the magnetic field detection coil formed by the detection electrodes RL(0) to RL(p), and output as sensing signals S(0) to S(p) from the amplifier circuit AMP. Therefore, by determining the detection electrode that detected the magnetic field when the driving electrode that generated the magnetic field is driven, the coordinates of the area touched by the pen can be determined.

[0309] When electric field touch detection is performed, and Figure 19 Similarly, an electric field is generated by driving electrodes TL(0)~TL(p). The change in the electric field caused by whether or not a finger touches the screen is transmitted to the amplifier circuit AMP through the detection electrodes RL(0)~RL(p) and output as the sensing signals S(0)~S(p).

[0310] Signal lines SL(0) to SL(p) are used to transmit image information during display, therefore they must be electrically isolated from each other during display. Therefore, in Figure 20 as well as Figure 21 The display device 1 shown includes a seventh switch and an eighth switch. In contrast, in... Figure 22 In the modified example shown, signal lines SL(0) to SL(p) are not used; instead, detection electrodes RL(0) to RL(p) are used for both magnetic field touch detection and electric field touch detection. Therefore, for magnetic field touch detection, the seventh and eighth switches can be omitted, thus suppressing the increase in occupied area.

[0311] In the first implementation, it is not required to generate a magnetic field to create a coil, so control becomes easier and the increase in the area occupied by the control circuit can be suppressed.

[0312] (Implementation Method Two)

[0313] Figure 22 This is a top view showing the configuration of the display device 1 according to Embodiment 2. Figure 22In this text, only the parts related to the display panel 2 described in Embodiment 1 are shown, and other parts are omitted.

[0314] exist Figure 22 In this context, TL(0) to TL(p) represent driving electrodes arranged parallel to each other between edges 2-U and 2-D of the display panel 2. Furthermore, TL(dLU) represents a dummy driving electrode for generating a magnetic field, arranged along edge 2-U in an area outside the display panel 2 (non-active area), and TL(dLD) represents a dummy driving electrode for generating a magnetic field, arranged along edge 2-D in an area outside the display panel 2 (non-active area). Since the dummy driving electrode for generating a magnetic field is arranged in the outer area of ​​the display panel 2, it will be referred to hereinafter as the outer area driving electrode.

[0315] In addition, Figure 14 In this context, USL(0)~USL(p) and USR(0)~USR(p) represent unit drive circuits, respectively. For example, in... Figure 16 , Figure 17 and Figure 23 As explained, the unit drive circuits USL(0) to USL(p) are respectively arranged along edge 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 respectively arranged along edge 2-R of the display panel 2, corresponding to the drive electrodes TL(0) to TL(p).

[0316] As described in Embodiment 1, during the magnetic field generation period TGT, a drive signal TSVCOM is supplied to two drive electrodes arranged such that they are separated by drive electrodes corresponding to the unit drive circuits that output the selection signal for the specified selection. For example, if the unit drive circuits USL(2) and USR(2) output the selection signal for the specified selection during the magnetic field generation period TGT, a drive signal TSVCOM is supplied to drive electrodes TL(1) and TL(3) arranged such that they are separated by drive electrodes TL(2) corresponding to these unit drive circuits USL(2) and USR(2). That is, for one end of drive electrode TL(1), a drive signal TSVCOM is supplied from the side 2-L, and for the other end of drive electrode TL(1), a ground voltage Vss is supplied from the side 2-R. At the same time, for the other end of drive electrode TL(3), a drive signal TSVCOM is supplied from the side 2-R, and for one end of drive electrode TL(3), a ground voltage Vss is supplied from the side 2-L. Thus, 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 to generate a strong magnetic field.

[0317] In this case, when a driving electrode TL(0) is selected that is positioned close to edge 2-U of the display panel 2, the driving electrode close to that driving electrode TL(0) becomes only driving electrode TL(1). Therefore, when driving electrode TL(0) is selected, the magnetic field generated in driving electrode TL(0) becomes weaker. Similarly, when a driving electrode TL(p) is selected that is positioned close to edge 2-D of the display panel 2, the driving electrode close to that driving electrode TL(p) becomes only driving electrode TL(p-1). Therefore, when driving electrode TL(p) is selected, the magnetic field generated in driving electrode TL(p) becomes weaker.

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

[0319] When a magnetic field is generated in the driving electrode TL(0), magnetic fields are also generated in the driving electrode TL(1) and the external region driving electrode TL(dLU), which are arranged apart from the driving electrode TL(0). Similarly, when a magnetic field is generated in the driving electrode TL(p), magnetic fields are also generated in the driving electrode TL(p-1) and the external region driving electrode TL(dLD), which are arranged apart from the driving electrode TL(p). This prevents a decrease in pen detection accuracy in the areas near the edges 2-U and 2-D of the display panel 2.

[0320] It should be noted that the external region driving electrodes TL(dLU) and TL(dLD) are only used to generate magnetic fields, so their linewidths dLU and dLD can be narrower than the linewidths dd of the driving electrodes TL(0) to TL(p).

[0321] Figure 8 This is a top view showing the generation of 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 selection signals indicating selection, in response to the selection signal from the unit driving circuit USL(0), the selection circuit SL-C is configured such that a driving signal TSVCOM is supplied to one end of the external region driving electrode TL(dLU) on the side 2-L, and a ground voltage Vss is supplied to one end of the driving electrode TL(1) on the side 2-L. Figure 14 as well as Figure 8Additionally, in response to the selection signal from the unit drive circuit USR(0) at this time, a ground voltage Vss is supplied to the other end of the external region drive electrode TL(dLU) on the side 2-R, and a drive signal TSVCOM is supplied to the other end of the drive electrode TL(1) on the side 2-R, thereby constructing the selection circuit SR-C( Figure 14 and Figure 24 ).

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

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

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

[0325] During the magnetic field generation period TGT, an example was described where two drive electrodes, configured with a drive electrode corresponding to the unit drive circuit that outputs a selection signal indicating selection, are supplied with the drive signal TSVCOM and the ground voltage Vss, but this is not a limitation. For example, two drive electrodes configured with a drive electrode corresponding to the region generating the strong magnetic field can also be selected using a corresponding unit selection circuit. In this case, as... Figure 8 As shown, unit drive circuits USL(dU) and USR(dU) are configured at both ends of the external region drive electrode TL(dLU), and unit drive circuits USL(dD) and USR(dD) are configured at both ends of the external region drive electrode TL(dLD).

[0326] In this case, during the magnetic field generation period TGT, two unit drive circuits in the unit drive circuits USL(0) to USL(p), USL(dL), and USL(dD), configured such that they are separated from the unit drive circuits corresponding to the drive electrodes that generate the strong magnetic field, output selection signals indicating selection. Similarly, two unit drive circuits in the unit drive circuits USR(0) to USR(p), USR(dL), and USR(dD), configured such that they are separated from the unit drive circuits corresponding to the drive electrodes that generate the strong magnetic field, output selection signals 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), configured with the unit selection circuit USL(2) separated by the unit selection circuit USL(2), output a selection signal indicating selection. Selection circuit SL-C( Figure 14 , Figure 8 According to the selection signals from the unit selection circuits USL(1) and USL(3), a drive signal TSVCOM is supplied to one end of the drive electrode TL(1) corresponding to the unit selection circuit USL(1), and a ground voltage Vss is supplied to one end of the drive electrode TL(3) corresponding to the unit selection circuit USL(3).

[0328] At this time, the unit drive circuits USR(1) and USR(3), configured with a unit selection circuit USR(2) corresponding to the drive electrode TL(2), output a selection signal indicating selection. The selection circuit SR-C( Figure 14 , Figure 23Based on the selection signals from the unit selection circuits USR(1) and USR(3), a ground voltage Vss is supplied to the other end of the drive electrode TL(1) corresponding to the unit selection circuit USR(1), and a drive signal TSVCOM is supplied to the other end of the drive electrode TL(3) corresponding to the unit selection circuit USR(3). As a result, in the region of the drive electrode TL(2), the magnetic field generated by the drive electrode TL(1) and the magnetic field generated by the drive electrode TL(3) are superimposed.

[0329] 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, the selection circuit SL-C supplies a drive signal TSVCOM to one end of the external region drive electrode TL(dLU) and a ground voltage Vss to one end of the drive electrode TL(1). Additionally, the selection circuit SR-C supplies a ground voltage Vss to the other end of the external region drive electrode TL(dLU) and a drive signal TSVCOM to the other end of the drive electrode TL(1). Thus, in Figure 24 In the middle, currents I1 and I2, indicated by arrows, flow through, thereby generating a magnetic field, and can generate a strong magnetic field in the region of the driving electrode TL(0).

[0330] Furthermore, when a strong magnetic field is generated in the driving electrode TL(p), Figure 24 The unit drive circuits USL(dD), USR(dD), USL(p-1), and USR(p-1) shown output selection signals indicating selection. In response, selection circuit SL-C supplies a ground voltage Vss to one end of the external region drive electrode TL(dLD) and a drive signal TSVCOM to one end of the drive electrode TL(p-1). Conversely, selection circuit SR-C supplies the drive signal TSVCOM to the other end of the external region drive electrode TL(dLU) and a ground voltage Vss to the other end of the drive electrode TL(p-1). Thus, in Figure 8 In the middle, the currents I1 and I2 flowing through it (indicated by arrows) generate a magnetic field, which can generate a strong magnetic field in the region of the driving electrode TL(p).

[0331] Of course, the external area driving electrode can also be configured only on one side of the display panel 2.

[0332] In the second embodiment, the area where the detection accuracy is reduced can be reduced in the display area (the area of ​​the display panel 2).

[0333] (Implementation Method 3)

[0334] In the display device 1, a display is made on the display panel 2, and detection is performed to determine whether an externally approaching object, such as a pen or finger, touches the area of ​​the display panel 2. In this third embodiment, the detection of whether an externally approaching object touches the area of ​​the display panel 2 is performed by executing multiple detection steps during one frame of display. Here, an example of detecting the touch of an externally approaching object by executing two detection steps during one frame will be described.

[0335] The two-stage detection process 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 coarse detection is performed to determine whether an object, such as a pen, that can be detected by magnetic field touch detection as an externally approaching object touches the area of ​​the display panel 2. If, in the first-stage detection step, a pen is detected touching the area of ​​the display panel 2 as an externally approaching object, a more detailed magnetic field touch detection is performed, detecting the coordinates and distance of the touch. Conversely, if no pen touch is detected in the first-stage detection step, an electric field touch detection is performed. This detailed magnetic field touch detection or electric field touch detection constitutes the second-stage detection step. Therefore, during one frame of display, a touch can be detected regardless of whether a pen or finger touches the area of ​​the display panel 2.

[0336] Although not specifically limited, the touch detection semiconductor device 6 ( Figure 8 ) and driving semiconductor devices DDIC ( Figure 13 The two-stage detection process is implemented. Specifically, the control circuit T-CNT within the touch detection semiconductor device 6 divides one frame into a first period and a second period following the first period. During the first period, magnetic field enable signal SC_EN indicates magnetic field touch detection. Furthermore, during this first period, the selection drive circuits SSL and SSR are controlled via control signal Y-CNT to perform coarse 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 whether pen touch has been detected via control signal SW. During the first period, the selection drive circuits SSL and SSR are controlled via control signal Y-CNT to perform coarse magnetic field touch detection.

[0337] In the magnetic field touch detection step of the first stage, if a pen touch is detected, the control circuit D-CNT within the driving semiconductor device DDIC also instructs magnetic field touch detection in the second period via the magnetic field enable signal SC_EN. In this case, in the second period, the driving circuits SSL and SSR are controlled by the control signal Y-CNT to perform detailed magnetic field touch detection. Thus, in the second period, a pen touch is detected.

[0338] On the other hand, in the magnetic field touch detection step of the first stage, if no pen touch is detected, the control circuit D-CNT within the driving semiconductor device DDIC in the second period instructs electric field touch detection via the electric field enable signal TC_EN. Thus, electric field touch detection is performed in the second period, detecting touch using a finger.

[0339] An example of a two-stage detection process performed by the driving semiconductor device DDIC based on the control signal SW from the touch detection semiconductor device 6 has been described, but it is not limited to this. For example, the touch detection semiconductor device 6 can also perform two-stage detection control by outputting a magnetic field enable signal SC_EN, an electric field enable signal TC_EN, etc. from the driving semiconductor device DDIC through the control signal SW.

[0340] The difference between coarse and fine magnetic field touch detection lies in the number of drive electrodes spaced apart during the magnetic field generation period (TGT). Specifically, during the magnetic field generation period (TGT), the number of drive electrodes spaced apart is greater in coarse magnetic field touch detection than in fine magnetic field touch detection. For example, in coarse magnetic field touch detection, a drive signal TSVCOM is supplied to a pair of drive electrodes spaced 32 times apart, as described in Embodiments 1 and 2. Conversely, in fine magnetic field touch detection, a drive signal TSVCOM is supplied to a pair of drive electrodes spaced less than 32 but more than or equal to 1, as described in Embodiments 1 and 2.

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

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

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

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

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

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

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

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

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

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

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

[0352] For the drive signals TL(n) to TL(n+5), respectively from Figure 25 The selected drive circuits SSL and SSR are shown to supply drive signals. Figure 25 (D)~ Figure 22 In (I), the left side represents the driving signal supplied to the driving electrodes TL(n) to TL(n+5) during touch detection CSS12, and the right side represents the driving signal supplied to the driving electrodes TL(n) to TL(n+5) during touch detection CSS24.

[0353] During touch detection (CSS12), for example, a drive signal TSVCOM is supplied from the selection drive circuit SSL to one end of the drive electrode TL(n), and a ground voltage Vss is supplied to one end of the drive electrode TL(n+5). At the same time, a ground voltage Vss is supplied from the selection drive circuit SSR to the other end of the drive electrode TL(n), and a drive signal TSVCOM is supplied to the other end of the drive electrode TL(n+5). As a result, magnetic fields are generated in the drive electrodes TL(n) and TL(n+5). The magnetic fields generated overlap in the region of the drive electrodes TL(n+1) to TL(n+4) sandwiched between the drive electrodes TL(n) and TL(n+5).

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

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

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

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

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

[0359] <Magnetic field touch detection action>

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

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

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

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

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

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

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

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

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

[0369] Although not illustrated, the microcontroller (MCU) includes an analog-to-digital converter (ADC), a clock signal generation circuit, a non-volatile memory storing a program, and a processing unit that operates according to the program stored in the non-volatile memory. The output from the aforementioned integrating circuit is supplied to the ADC via the MCU's ADC terminal, converting it into a digital signal. The processing unit processes the converted digital signal to determine whether the pen is close to one of the coils CY(0) to CY(p).

[0370] The processing unit within the microcontroller (MCU) generates control signals according to the program. These control signals include selection signals for selector switches SWA0 to SWAp, an enable signal EN, and a reset signal rst. Additionally, a clock signal MCLK with periodically changing voltage is generated by the clock signal generation circuit within the MCU.

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

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

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

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

[0375] The integrator circuit includes a capacitor CP1, a switch SWAA that receives a reset signal rst as a switch control signal, and an operational amplifier OP1. The non-inverting input (+) of the operational amplifier is connected to ground voltage Vss, and the inverting input (-) is connected to the output of the integrator circuit via the capacitor CP1. Additionally, the switch SWAA is connected between the output and input of the integrator circuit.

[0376] exist Figure 26 At time t0, the reset signal rst goes low. This causes the switch SWAA to open, releasing the reset. At this time, the microcontroller MCU sets the enable signal EN high. Consequently, the clock signal CLK is supplied to node nA via resistor R11 from the buffer circuit BF.

[0377] The clock signal CLK supplied to node nA is also supplied to the gain circuit. The output OUT1 of the gain circuit varies according to the voltage change of the clock signal MCLK, therefore, as... Figure 26 The change is shown in (E). The output OUT1 of the gain circuit is supplied to the rectifier circuit via the filter circuit, and the rectified output is supplied to the integrator circuit. From time t0 to time t1, the voltage at node nA changes periodically, but does not change on the envelope, so the output of the integrator circuit becomes a constant value.

[0378] At time t1, the microcontroller MCU sets the enable signal EN low. As a result, node nA becomes a high-impedance state (Hi-Z). Additionally, at time t1, the selection signal SC_SEL ( Figure 26 For example, switch SWA3 corresponding to coil CY(3) becomes closed. Thus, one end of coil CY(3) becomes connected to node nA.

[0379] At this time, since there is a pen near the coil CY(3), an induced voltage is generated in the coil inside the pen by the magnetic field generated during the magnetic field generation period TGT from time t0 to t2, which affects the capacitor element C( Figure 2 (Charge)

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

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

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

[0383] (Implementation Method 4)

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

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

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

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

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

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

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

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

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

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

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

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

[0396] <Variation Example 1>

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

[0398] <Variation Example 2>

[0399] Figure 38This is a top view showing the configuration of the display device 1 according to the second variation of Embodiment 4. Figure 38 The image shows a schematic top view of display panel 2. Figure 38 and Figure 28 Similarly, therefore, only the differences will be explained here.

[0400] exist Figure 38 In the second variation shown, the detection signal lines SDL(1)P to SDL(m)P, which are paired with the detection signal lines SDL(1) to SDL(m), and the paired detection signal lines SDL(1) to SDL(m) extend parallel to each other. Figure 28 In order to avoid complicating the attached diagram, only the detection signal lines that are paired with the detection signal lines SDL(1), SDL(2), and SDL(n) are labeled with the attached diagram labels SDL(1)P, SDL(2)P, and SDL(n)P respectively. The attached diagram labels for other detection signal lines are omitted.

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

[0402] When a magnetic field is detected, a magnetic field detection coil is formed by pairs of parallel detection signal lines. For example, a magnetic field detection coil is formed by pairs of detection signal lines SDL(1) and SDL(1)P, pairs of detection signal lines SDL(2) and SDL(2)P, and pairs of detection signal lines SDL(n) and SDL(n)P. In this case, the change in the signal of one of the pairs of detection signal lines, such as 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 the other pair of detection signal lines SDL(1)P, SDL(2)P, and SDL(n)P.

[0403] Magnetic field detection coils are formed in the detection signal lines SDL(1)~SDL(m) and SDL(1)P~SDL(m)P respectively, thus eliminating the need for detection electrodes for magnetic field detection in the CF glass substrate CGB, enabling inexpensive manufacturing. Furthermore, it is possible to... Figure 28Similarly, in the scenario described above, electric field touch detection is performed.

[0404] Alternatively, a specific pair of detection signal lines from the multiple pairs of detection signal lines arranged in one column (driving electrodes Tx1-1 to TxN-1) can be used to detect the magnetic field when a magnetic field touch is detected. This specific pair of detection signal lines is equivalent to... 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 driving electrode Tx1-1 arranged in the first row, thus increasing the number of orthogonal scan lines and widening the detectable range when detecting magnetic field touch, making it suitable for magnetic field touch detection. Similarly, in the other columns of the dot matrix, the detection signal lines of the multiple pairs of detection signal lines contained in each column that are connected to the driving electrodes Tx1-2 to Tx1-M arranged in the first row are used as magnetic field detection coils when detecting magnetic field touch.

[0405] <Variation Example 3>

[0406] Figure 39 This is a top view showing the configuration of the display device 1 according to Variation 3 of Embodiment 4. Figure 39 The image shows a schematic top view of display panel 2. Figure 39 and Figure 28 Similarly, therefore, only the differences will be explained here.

[0407] exist Figure 28 In this variation, the detection signal lines extend to the area connected to the corresponding drive electrode. In contrast, in this third variation, the detection signal lines SDL(1) to SDL(m) extend transversely across the display panel 2. For example, they are arranged to extend from edge 2-D to edge 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, but the other columns are the same.

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

[0409] On side 2-U, a switch SDS is connected between the predetermined detection signal lines. Figure 39 In this context, 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 represented.

[0410] When the magnetic field touch detection is activated, the switch SDS and Figure 19 Similarly, the eighth switches k00 to kp shown are also in the ON state. This connects multiple detection signal lines. Figure 39 In the example, the detection signal lines SDL(1) and SDL(2) are connected on side 2-U. Thus, when magnetic field touch detection is performed, a magnetic field detection coil is formed through the detection signal lines SDL(1) and SDL(2). At this time, a ground voltage Vss is supplied to, for example, the detection signal line SDL(2), and the change in the signal in the detection signal line SDL(1) is output as the sensing signal S.

[0411] Therefore, by using detection signal lines SDL(1) to SDL(m) to form a magnetic field detection coil, it is unnecessary to place detection electrodes for magnetic field detection in the CF glass substrate CGB, thus enabling inexpensive manufacturing. Furthermore, it is possible to... Figure 28 Similarly, in the scenario described above, electric field touch detection is performed.

[0412] exist Figure 39 The example described is of using adjacent detection signal lines SDL(1) and SDL(2) to form a magnetic field detection coil, but it is not limited to this. That is, detection signal lines arranged with detection signal lines spaced apart can also be connected by a switch to form magnetic field detection coils that overlap each other. In addition, it is possible to use 1.5 or more windings instead of a single winding.

[0413] <Variation Example 4>

[0414] Figure 30 This is a top view showing the configuration of the display device 1 according to the fourth variation of embodiment four. Figure 30 and Figure 28 Similarly, therefore, this section mainly focuses on the differences. Figure 30 In this context, SL(0) to SL(p) represent signal lines. For example, in... Figure 28 The description states that the detection signal lines SDL(1) to SDL(m) are arranged in the display panel 2 in parallel with the signal lines SL(0) to SL(p).

[0415] In this variation, signal lines SL(0) to SL(p) are used as signal wiring to generate the magnetic field. Although not particularly limited, in this variation, multiple signal lines are bundled together and supplied with the drive signal TSVCOM during the magnetic field generation period TGT. If... Figure 30For 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. In addition, 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, for one end of the bundled signal lines SL(0) to SL(19), a drive signal TSVCOM is supplied on the side 2-U of the display panel 2, and a ground voltage Vss is supplied on the other end on the side 2-D of the display panel 2. At this time, for example, for one end of the bundled signal lines SL(40) to SL(59), a ground voltage Vss is supplied on the side 2-U of the display panel 2, and a drive signal TSVCOM is supplied on 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 this modified example, the magnetic field detection coil is constructed, for example, by detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB. When the magnetic field detection coil is formed by detection electrodes RL(0) to RL(p), the detection electrodes RL(0) to RL(p) are respectively formed to be orthogonal to and parallel to the signal lines SL(0) to SL(p), such as... Figure 21 As shown, predetermined detection electrodes are connected. Alternatively, a magnetic field detection coil can be formed using scan lines GL(0) to GL(p).

[0418] Alternatively, the magnetic field can be detected using detection electrodes Tx1-1 to TxN-M. If the magnetic field is detected using detection electrodes Tx1-1 to TxN-M, there is no need to configure detection electrodes for magnetic field detection in, for example, the CF glass substrate CGB, which allows for inexpensive manufacturing.

[0419] <Variation Example 5>

[0420] Figure 40 This is a top view showing the configuration of the display device 1 according to the fifth variation of Embodiment 4. Figure 40 and Figure 30 Similarly, the main difference will be explained here. In this fifth variation, detection signal lines SDL(1)L to SDL(m)L are configured to extend parallel to the detection signal lines SDL(1) to SDL(m). Figure 40In order to avoid complicating the figures, only the detection signal lines arranged in the driving electrodes Tx1-1 to TxN-1 in the first column are labeled with reference numerals SDL(1)L, SDL(2)L and SDL(n)L.

[0421] Here, the driving electrode in column 1 is used as an example for explanation, but the same applies to the other columns. Detection signal line SDL(1)L extends parallel to detection signal line SDL(1), and detection signal line SDL(1)L is connected in such a way that a loop LPP is formed in the region of the driving electrode Tx1-1 connected to detection signal line SDL(1). Similarly, detection signal line SDL(2)L extends parallel to detection signal line SDL(2), and detection signal line SDL(2)L is connected in such a way that a loop LPP is formed in the region of the driving electrode Tx2-1 connected to detection signal line SDL(2). Likewise, detection signal line SDL(n)L extends parallel to detection signal line SDL(n), and detection signal line SDL(n)L is connected in such a way that a loop LPP is formed in the region of the driving electrode TxN-1 connected to detection signal line SDL(n).

[0422] A loop LPP is formed, for example, by bending and connecting the detection signals that are connected to each other when viewed from above.

[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 in one of the interconnected detection signal lines becomes a sensing signal S, supplying a ground voltage Vss to the other detection signal line. Therefore, if a pen touches the vicinity of the driving electrode, the magnetic field from the pen generates a signal change in the detection signal line of the loop LPP in the region of the driving electrode, allowing 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 respectively designated as the other detection signal lines in the loop, a ground voltage Vss is supplied to these detection signal lines SDL(1)L, SDL(2)L to SDL(n)L. At this time, the change in the signal of the detection signal lines SDL(1), SDL(2)L to SDL(n), which are the detection signal lines in the loop, is detected as a sensing signal S. Thus, it is possible to detect which part of the first column is touched by the pen, and it is possible to detect which row (which area among the driving electrodes Tx1-1 to TxN-1) is touched in the first column.

[0425] In the fifth modification example, the detection signal line is also used as the magnetic field detection coil, so it can be manufactured at a low cost. In addition, electric field touch detection can be performed in the same manner as in the fourth modification example. Moreover, since the detection signal line can be shared in magnetic field detection and electric field detection, an increase in the price of a display device capable of performing magnetic field touch detection and electric field touch detection can be suppressed.

[0426] (Embodiment 5)

[0427] In Embodiments 1 to 4, mainly an example in which, in the display panel 2, signal wirings orthogonal to the signal lines SL(0) to SL(p) are used to generate a magnetic field during the magnetic field generation period TGT has been described. In this Embodiment 5, an example in which, in the display panel 2, signal wirings arranged in parallel with the signal lines SL(0) to SL(p) are used to generate a magnetic field during the magnetic field generation period TGT will be described. Here, a case where a driving electrode is used as the signal wiring arranged in parallel with the signal lines SL(0) to SL(p) will be described.

[0428] Figure 31 is a schematic plan view showing the configuration of the display device 1 according to Embodiment 5. In Figure 31 shows a part related to the display panel 2. In the display panel 2, a plurality of signal lines SL(0) to SL(p), a plurality of scan lines GL(0) to GL(p), a plurality of driving electrodes TL(0) to TL(p), etc. are arranged, but in Figure 31 for easy explanation, a display panel 2 in which signal lines SL(0) to SL(7), scan lines GL(0) to GL(3), and driving electrodes TL(0) to TL(7) are arranged is shown. 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 Embodiment 5, during the magnetic field generation period TGT, the driving electrodes TL(0) to TL(7) to which a driving signal is 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] Scan lines GL(0) to GL(3) extend in the row direction and are arranged 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 arranged along the edges 2-L and 2-R of the display panel 2, respectively. Scan lines GL(0) to GL(3) are connected to gate driver 5-1 on the edge 2-L side and to gate driver 5-2 on the edge 2-R side. In the display panel 2, during display, gate driver 5-1 supplies, for example, a high-level scan line signal to scan line GL(0), and in the next timing, gate driver 5-2 supplies a high-level scan line signal to the next scan line GL(1). That is, high-level scan line signals are alternately supplied from gate drivers 5-1 and 5-2 to scan lines GL(0) to GL(3). This prevents the bezel from becoming too large.

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

[0431] exist Figure 31 In the diagram, SU-R and SD-R represent driving circuits, and SU-C and SD-C represent selection circuits. Similar to Embodiment 1, the driving circuit SU-R and the selection circuit SU-C together form a selection driving circuit (either a first or second driving circuit) SSU, and the driving circuit SD-R and the selection circuit SD-C together form a selection driving circuit (either a second or first driving circuit) SSD. The selection driving circuit SSU is arranged along edge 2-U of the display panel 2, and the selection driving circuit SSD is arranged along edge 2-D of the display panel 2.

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

[0433] exist Figure 31 In this context, VCOM represents a voltage wiring supplied with a predetermined voltage VCOMDC. Additionally, TPL represents a voltage wiring supplied with a ground voltage Vss, and TPH represents a voltage wiring supplied with a predetermined voltage (e.g., VCOMDC). Figure 15 The voltage wiring is shown as Vp. The selector drive circuits SSU and SSD are connected to the drive electrode of the selected voltage wiring TPL to supply the ground voltage Vss to the selected drive electrode. Additionally, the selector drive circuits SSU and SSD are connected to the drive electrode of the selected voltage wiring TPH to supply the drive signal to the selected drive electrode.

[0434] The magnetic field detection coil is constructed, for example, by means of detection electrodes RL(0) to RL(p) formed in the CF glass substrate CGB. In this fifth embodiment, the detection electrodes RL(0) to RL(p) extend in the row direction and are arranged parallel to each other in the column direction in the display panel 2, similar to the scan lines. Furthermore, during magnetic field detection TDT, predetermined detection electrodes are connected in a manner that forms a magnetic field detection coil. Alternatively, the magnetic field detection coil can also be formed using scan lines GL(0) to GL(3).

[0435] In this fifth embodiment, when electric field touch detection is performed, the selected 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, the change in the electric field is detected by the detection electrodes RL(0) to RL(p) or the scan lines GL(0) to GL(3) formed in the CF glass substrate CGB.

[0436] It should be noted that, although not specifically restricted, gate drivers 5-1 and 5-2 have the function of making scan lines GL(0) to GL(3) float, for example, during the magnetic field generation period TGT, making scan lines GL(0) to GL(3) float.

[0437] <Selection of the configuration of the drive circuit>

[0438] Figure 32This is a circuit diagram showing the configuration of the selection drive circuits SSU and SSD involved in Embodiment 5. Figure 32 It is a schematic diagram, but depicted in conjunction with an actual configuration. In this diagram, it represents... Figure 31 The driving electrodes TL(0) to TL(7), 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) are shown.

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

[0440] In this fifth embodiment, the voltage wiring TPL and TPH are configured to surround the display panel 2. If... Figure 9 Using the module shown as an example, the voltage wiring TPL and TPH are configured to pass through the areas between edge 2-L of display panel 2 and edge 900-L of module 900, the areas between edge 2-U of display panel 2 and edge 900-U of module 900, the areas between edge 2-R of display panel 2 and edge 900-R of module 900, and the areas between edge 2-D of display panel 2 and edge 900-D of module 900. That is, the voltage wiring TPL and TPH are located within the top, bottom, left, and right edges of module 900. On the other hand, the voltage wiring VCOM is located in the area between edge 2-D of display panel 2 and edge 900-D of module 900.

[0441] In this fifth embodiment, the selection circuit SU-C within the drive circuit SSU includes unit selection circuits UUC(0) to UUC(6) corresponding to the unit drive circuits USU(0) to USU(6), respectively. Each unit selection circuit UUC(0) to UUC(6) includes 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 controlled 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 also controlled 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 the driving electrode TL(0) on one side, and is controlled by the selection signal C10 from the unit selection circuit USU(0). Additionally, in the unit selection circuit UUC(0), the eleventh switch USW2 is connected between the voltage wiring TPL and the driving electrode TL(0) on one side, and is controlled by the 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 wiring TPH and TPL and the driving electrode TL(1) on one side, and are controlled by the 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 wiring TPH, TPL and one end of the drive electrode TL(2), and are switched by the 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 one end of the voltage wiring TPH, TPL and the driving electrode TL(3), and are switched by the 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 one end of the voltage wiring TPH, TPL and the driving electrode TL(4), and are switched by the 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 one end of the voltage wiring TPH, TPL and the driving electrode TL(5), and are switched by the 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 one end of the voltage wiring TPH, TPL and the driving electrode TL(6), and are switched by the selection signals C16 and C26 from the unit selection circuit USU(6).

[0444] The drive selection circuit SSD's drive circuit SD-R also includes unit drive circuits USD(0) to USD(6) corresponding to the drive electrodes TL(0) to TL(6), respectively. Additionally, the selection circuit SD-L includes unit selection circuits UDC(0) to UDC(6) corresponding to the drive electrodes and unit drive circuits, respectively. The unit selection circuits UDC(0) to UDC(6) each include a twelfth switch USW3, a thirteenth switch USW4, and a fourteenth switch USW5, which are switched by control signals from the corresponding unit selection circuits. Here, 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 controlled by the selection signal S30 from the unit drive circuit USD(0), the thirteenth switch USW4 is controlled by the selection signal S40 from the unit drive circuit USD(0), and the fourteenth switch USW5 is controlled by the selection signal S40 from the unit drive circuit USD(0).

[0446] In addition, 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 to the voltage wiring VCOM, TPL, and TPH. They 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 to the voltage wiring VCOM, TPL, and TPH. They 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 to the voltage wiring VCOM, TPL, and TPH. They 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 to the voltage wiring VCOM, TPL, and TPH. Switching is controlled 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 to the voltage wiring VCOM, TPL, and TPH. Switching is controlled by selection signals S35 and S45 from the unit drive circuit USD(5). Furthermore, 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 to the voltage wiring VCOM, TPL, and TPH. Switching is controlled by selection signals S36 and S46 from the unit drive circuit USD(6).

[0448] To avoid complicating the figures, in each of the unit selection circuits UDC(0) to UDC(6), the thirteenth switch USW4 and the fourteenth switch USW5 are shown to be controlled by a selection signal (e.g., selection signal S40), but the thirteenth switch USW4 and the fourteenth switch USW5 are controlled by the corresponding unit drive circuits respectively.

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

[0450] Unit drive circuits USU(0) to USU(6) each include a shift segment, and the shift segments are connected in series in this order. Similarly, unit drive circuits USD(0) to USD(6) also include shift segments, and the shift segments are connected in series in this order. For example, selection information SEI indicating selection is set in unit drive circuits USU(0), USU(1), USD(0), and USD(1), and the selection information SEI is shifted sequentially toward unit drive circuits USU(6) and USD(6) in sync with a clock signal (not shown).

[0451] For example, if selection information SEI 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) through selection signal S20, and turns off the tenth switch USW1 through 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) through selection signal S11, and turns off the eleventh switch USW2 through selection signal S21.

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

[0453] Therefore, one end of the driving electrode TL(0) is connected to the voltage wiring TPL via the eleventh switch USW2 in the unit selection circuit UUC(0), and the other end of the driving electrode TL(1) is connected to the voltage wiring 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 wiring TPH via the fourteenth switch USW5 in the unit selection circuit UDC(0), and the other end of the driving electrode TL(1) is connected to the voltage wiring TPH via the tenth switch USW1 in the unit selection circuit UUC(1). As a result, a 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 to the other end of the driving electrode TL(0) and the other end of the driving electrode TL(1) as a driving signal.

[0454] With the predetermined voltage, a current flows in the driving electrode TL(0) in the direction from the other end toward the other end (in the figure, the direction toward the upper side), and a current flows in the driving electrode TL(1) in the direction from the one end toward the other end (in the figure, the direction toward the lower side), generating a magnetic field in each driving electrode TL(0) and TL(1), and overlapping magnetic fields in the region 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 use selection signals S12 to S16 and S22 to S26 to turn off the tenth switch USW1 and the eleventh switch USW2 in the corresponding unit selection circuits UUC(2) to UUC(6). Additionally, at this time, the unit drive circuits USD(2) to USD(6) respectively use selection signals S32 to S36 and S42 to S46 to turn 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) become high-impedance states.

[0456] If the clock signal changes and the selection information SEI moves to the unit drive circuits USU(1), USU(2), UDC(1), and UDC(2), then the unit drive circuit USU(1) uses selection signals S11 and S21 to make the tenth switch USW1 in the unit selection circuit UUC(1) open and the eleventh switch USW2 open. At this time, the unit drive circuit USU(2) uses selection signals S11 and S21 to make the tenth switch USW1 in the unit selection circuit UUC(2) open and the eleventh switch USW2 open. In addition, the unit selection circuit USD(1) uses selection signals S31 and S41 to make the fourteenth switch USW5 in the unit selection circuit UDC(1) open and the twelfth switch USW3 and the thirteenth switch USW4 open. In addition, the unit selection circuit USD(2) uses selection signals S32 and S42 to turn on the thirteenth switch USW4 in the unit selection circuit UDC(2) and turn off the twelfth switch USW3 and the fourteenth switch USW5.

[0457] As a result, in the driving electrode TL(1), a current flows from one end to the other, and in the driving electrode TL(2), a current flows from one end to the other. Through this current, a magnetic field is generated in the driving electrodes TL(1) and TL(2), resulting in an overlapping magnetic field. 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) are in the open state, and the driving electrodes TL(0), TL(3) to TL(6) are in a high-impedance state.

[0458] Subsequently, synchronized with the clock signal, the SEI moves toward the unit drive circuits USU(6) and USD(6) according to the selection information, generating magnetic fields in sequence. That is, magnetic fields are generated in the drive electrodes TL(2) and TL(3), in the next timing, magnetic fields are generated in the drive electrodes TL(3) and TL(4), in the next further timing, magnetic fields are generated in the drive electrodes TL(4) and TL(5), and then, magnetic fields are generated in the drive electrodes TL(5) and TL(6).

[0459] The direction of the current flowing through the driving electrodes is not limited to the direction described above. For example, when a magnetic field is generated in the driving electrodes TL(0) and TL(1), the current can flow from one end to the other end in the driving electrode TL(0), and the current can flow from the other end to one end in the driving electrode TL(1). That is, the directions of the current can be opposite between a pair of driving electrodes arranged adjacent to each other.

[0460] An example using drive electrodes arranged adjacent to each other has been described, but this is not a limitation. For example, a magnetic field can also be generated by drive electrodes arranged to sandwich one or more drive electrodes. For example, selection information SEI indicating selection can be set in the unit drive circuits USU(0), USC(2), USD(0), and USD(2). Thus, a magnetic field is generated in a pair of drive electrodes TL(0) and TL(2) arranged to sandwich drive electrode TL(1). Subsequently, by shifting the selection information SEI synchronously with the change of the clock signal, a magnetic field is sequentially generated in the drive electrodes arranged to sandwich one drive electrode.

[0461] When electric field touch detection is performed, the unit drive circuits USU(0) to USU(6) respectively use selection signals S10 to S16 and S20 to S26 to turn off the tenth switch USW1 and the eleventh switch USW2 in the corresponding unit selection circuits UUC(0) to UUC(6). 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) turns on the twelfth switch USW3 through the selection signal S30. As a result, the drive electrode TL(0) is connected to the voltage wiring VCOM via the twelfth switch USW3. In this fifth embodiment, in the case of electric field touch detection, the control circuit D-CNT( Figure 8 For the voltage wiring VCOM, a periodically varying electric field drive signal is supplied. Thus, when an electric field touch is detected, the drive electrode TL(0) generates an electric field according to the electric field drive 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] By selecting the information SEI to move from the unit drive circuit USD(0) toward USD(6), an electric field is generated sequentially from the drive electrode TL(2) toward TL(6).

[0464] An example is described where, during electric field touch detection, a periodically varying electric field drive signal is supplied to the voltage wiring VCOM, but this is not a limitation. For example, instead of using selection signal S30 to turn on the twelfth switch USW3, selection signal S40 can be used to complementaryly turn on / off switches USW4 and USW5. By having the thirteenth switch USW4 and the fourteenth switch USW5 complementaryly turn on / off, the drive electrode TL(0) is alternately connected to the voltage wirings TPH and TPL. As a result, supplying a time-varying voltage to the drive electrode TL(0) can generate a time-varying electric field.

[0465] When magnetic field touch detection is performed, the magnetic field detection coil can be formed using detection electrodes RL(0) to RL(p) or scan lines GL(0) to GL(p), similar to the case described in Embodiment 4. Alternatively, when electric field touch detection is performed, scan lines can be used as detection electrodes to detect changes in charge.

[0466] <Variation Example>

[0467] Figure 33 This is a circuit diagram showing the configuration of the selection drive circuits SSU and SSD involved in the modified example of implementation method five. Figure 33 It is a schematic diagram, but it depicts the actual configuration. Figure 33 and Figure 32 Similarly, this section will mainly focus on explaining the differences.

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

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

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

[0471] (Implementation Method Six)

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

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

[0474] In this sixth embodiment, a selection drive circuit SSU-S is also arranged along edge 2-U of the display panel 2. The selection drive circuit SSU-S in this sixth embodiment includes a drive circuit SU-R and a selection connection circuit SU-S. Unlike the selection circuit SU-C described in embodiment five, the selection connection circuit SU-S forms a magnetic field generating coil by connecting the signal wiring arranged parallel to the signal lines SL(0) to SL(p) during the magnetic field generation period TGT. Here, the signal wiring arranged parallel to the signal lines SL(0) to SL(p) corresponds to the voltage wiring arranged along the drive electrode and edges 2-L and 2-R of the display panel 2.

[0475] In embodiment five, the voltage wiring TPH arranged between edge 2-L of display panel 2 and edge 900-L of module 900, and the voltage wiring TPL arranged between edge 2-R of display panel 2 and edge 900-R of module 900, are used to supply predetermined voltages and ground voltage Vss to the selection circuit SU-C. In contrast, in embodiment six, although not particularly restrictive, the voltage wirings TPL and TPH arranged along edges 2-L and 2-R of display panel 2 are also used as windings for the magnetic field generating coil.

[0476] <Selecting the configuration of the connection circuit>

[0477] Figure 35 This is a circuit diagram showing the configuration of the selection drive circuit SSU-S involved in Embodiment Six. Figure 35 It is a schematic diagram, but it depicts a configuration that corresponds to the actual setup. Figure 35 In the middle, select the drive circuit SSD and drive electrodes TL(0)~TL(6) and Figure 32 They are the same, therefore the explanation is omitted.

[0478] Drive circuit SU-R and Figure 32Similarly, multiple unit drive circuits USU(0) to USU(6) are included. Each unit drive circuit USU(0) to USU(6) includes a shift segment. The shift segments of each unit drive circuit USU(0) to USU(6) are connected in series, and the selection information SEI set in the unit drive circuit USU(0) moves toward the unit drive circuit USU(6) synchronously with a clock signal (not shown). The unit drive circuits USU(0) to USU(6) output selection signals S50 to S56 indicating selection by setting the selection information SEI, respectively. For example, in the unit drive circuit USU(3), if the selection information SEI indicating selection is supplied from the preceding unit drive circuit USU(2), 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), respectively. 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 edge 2-L of the display panel 2, and the voltage wiring TL(TPL) arranged along edge 2-R of the display panel 2, with a drive electrode sandwiched between them. Figure 35 In the diagram, voltage wiring TL(TPH) represents the area arranged along edge 2-L of display panel 2 in voltage wiring TPH, and voltage wiring TL(TPL) represents the area arranged along edge 2-R of display panel 2 in voltage wiring TPL. Voltage wiring TL(TPH) and TL(TPL) are arranged along edge 2-L and edge 2-R of display panel 2, and are therefore parallel to driving electrodes TL(0) to TL(6).

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

[0481] Similarly, the fifteenth switch USW6 (5) is connected between one end of the drive electrode TL (4) and the drive electrode TL (6), and is switched by the selection signal S55 from the unit drive circuit USU (5). The fifteenth switch USW6 (6) is connected between one end of the drive electrode TL (5) and the voltage wiring TL (TPL), and is switched by the 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 and turns off the fourteenth switch USW5 in the unit selection circuit UDC(1). With the selection signal S50, the fifteenth switch USW6(0) turns on, thus connecting the voltage wiring TL(TPH) and the drive electrode TL(1), which are arranged parallel to each other, in series. As a result, a magnetic field generating coil is formed, making the voltage wiring TL(TPH) and the drive electrode TL(1) windings. Magnetic fields are generated in the voltage wiring TL(TPH) and the drive electrode TL(1) respectively by the current flowing through the series-connected voltage wiring TL(TPH) and drive electrode TL(1). In the region of the drive electrode TL(0) sandwiched between the voltage wiring TL(TPH) and the drive electrode TL(1), the generated magnetic fields overlap, producing a strong magnetic field.

[0483] Next, if the selection information SEI indicating the selection moves 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. In addition, 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. The fifteenth switch USW6(1) is turned on, so the drive electrodes TL(0) and TL(2) arranged parallel to each other are connected in series to form a magnetic field generating coil that makes these drive electrodes windings. In addition, 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, thereby generating a strong magnetic field. Furthermore, when the fifteenth switch USW6(6) is turned on via the selection signal S56 from the unit drive circuit USU(6), a magnetic field generating coil is formed, making the drive electrode TL(5) and the voltage wiring TL(TPL) windings. In this case, a strong magnetic field is generated in the region of the drive electrode TL(6).

[0485] exist Figure 35 The description focuses on the case where one driving electrode is sandwiched in the middle, but it is not limited to this. For example, two or more driving electrodes may be sandwiched in the middle, or no driving electrode may be sandwiched in the middle. For example, when two driving electrodes are sandwiched in the middle, the fifteenth switch USW6(0) is connected between the voltage wiring TL(TPH) and the driving electrode TL(2), and the fifteenth switch USW6(1) is connected between the driving electrode TL(0) and the driving electrode TL(3). On the other hand, when no electrode is sandwiched in the middle, the fifteenth switch USW6(0) is connected between the voltage wiring TL(TPH) and the driving electrode TL(0), and the fifteenth switch USW6(1) is connected between the driving electrode TL(0) and the driving electrode TL(1).

[0486] The magnetic field detection coil and electric field detection electrodes are the same as in Embodiment 5. Furthermore, electric field touch detection can also be implemented in the same way as in Embodiment 5.

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

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

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

[0490] Additionally, during the magnetic field generation period in the TGT, more than one drive wire is sandwiched between the selected pair of drive wires (in...Figure 8 In the case of a driving electrode (middle drive electrode), the clamped drive wiring can be regarded as a third drive wiring. Furthermore, in the case of... Figure 8 For example, if the driving electrodes TL(0) to TL(p) are considered as driving wiring, the signal lines SL(0) to SL(p) extending in the column direction in a manner that intersects with the driving electrodes TL(0) to TL(p) can be considered as detection wiring. Of course, the detection wiring is not limited to the signal lines SL(0) to SL(p), and can also be the scan lines GL(0) to GL(p) or the detection electrodes RL(0) to RL(p).

[0491] Those skilled in the art will be able to conceive of various modifications and alterations within the scope of the present invention, and it should be understood that such modifications and alterations also fall within the scope of the present invention.

[0492] For example, any method obtained by adding, deleting, or designing the constituent components of the above embodiments as appropriate by those skilled in the art; or any method obtained by adding, omitting, or changing the conditions of the steps, as long as it contains the spirit of the present invention, is included within the scope of the present invention.

[0493] For example, in the embodiment, the common electrodes TL(0) to TL(p) and signal lines SL(0) to SL(p) are described as extending in the column direction and arranged in the row direction, but the row and column directions vary depending on the viewing angle. Changing the viewing angle, the case where the common electrodes TL(0) to TL(p) and signal lines SL(0) to SL(p) extend in the row direction and are arranged in the column direction is also included within the scope of the present invention. Furthermore, the term "parallel" as used in this specification means extending from one end to the other without intersecting. Therefore, even if one line is partially or entirely inclined relative to the other line, as long as these lines do not cross from one end to the other, this state is considered "parallel" in this specification. Additionally, in Figure 18 The example shown is that when an electric field touch is detected, the driving electrode other than the driving electrode that generates the electric field is connected to the voltage wiring VCOM, but it is not limited to this. The driving electrode other than the driving electrode that generates the electric field can also be in a floating state.

[0494] Explanation of reference numerals in the attached figures

[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: Select drive circuit; SL-R, SR-R, SU-R, SD-R: Drive circuit; SL-C, SR-C, SU-C, SD-C: Select circuit; SU-S: Select connection circuit; SDC: Select 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 device for detecting the position of an object, wherein, include: Multiple driving electrodes, each extending in a first direction, are arranged in a second direction intersecting the first direction in a detection region for detecting externally approaching objects; Multiple detection electrodes, each extending in a second direction, are arranged in the first direction within the detection region; A first driving wiring extends in the second direction and faces one end of the plurality of driving electrodes; A second driving wiring extends in the second direction and faces the other end of the plurality of driving electrodes; A first reference wiring extends in the second direction and faces the other end of the plurality of driving electrodes; A second reference wiring extends in the second direction and faces one end of the plurality of driving electrodes; Multiple first switching circuits are combined between one end of the multiple driving electrodes, the first driving wiring and the second reference wiring; as well as Multiple second switching circuits are combined between the other end of the multiple drive electrodes, the second drive wiring, and the first reference wiring.

2. The apparatus according to claim 1, wherein, It also includes a switch control unit, which connects one end of the first drive electrode to the first drive wiring and the other end to the first reference wiring when it detects the external proximity of the object.

3. The apparatus according to claim 2, wherein, When the switch control unit detects the external proximity of the object, it connects one end of a different driving electrode (different from the first driving electrode) to the second reference wiring and the other end to the second driving wiring.

4. The apparatus according to claim 3, wherein, At least one driving electrode is included between the first driving electrode and the other driving electrodes.

5. The apparatus according to claim 4, wherein, The first drive wiring and the second drive wiring respectively supply alternating current to the drive electrodes. The proximity of the object is detected by using the magnetic field generated between the first driving electrode and the other driving electrodes.

6. The apparatus according to claim 1, wherein, It also includes a switch control unit, which, when detecting the approach of the object, connects one end of each of the first plurality of drive electrodes, which are configured close to each other as a plurality of drive electrodes, to the first drive wiring and connects the other end of each of them to the first reference wiring.

7. The apparatus according to claim 6, wherein, The directions of the currents in the first plurality of driving electrodes that are closely arranged are the same.

8. The apparatus according to claim 6, wherein, When the switch control unit detects the external proximity of the object, it connects the other end of each of the plurality of driving electrodes, which are second plurality of driving electrodes located at different positions in the second direction and are arranged close to each other, to the second driving wiring, and connects the first end of each of them to the second reference wiring.

9. The apparatus according to claim 8, wherein, The directions of the currents in the second plurality of driving electrodes in the close configuration are the same, but opposite to the directions of the first plurality of driving currents in the close configuration.

10. The apparatus according to claim 1, wherein, It also includes a switch control circuit. When the switch control circuit detects the approach of the object, Under the first timing condition, one end of the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring. In the second timing immediately following the first timing, one end of the (n+2)th second driving electrode adjacent to the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring, where n is a natural number.

11. The apparatus according to claim 10, wherein, For a continuously arranged driving electrode, current is supplied in the same direction by shifting it one by one at a first timing and a second timing.

12. The apparatus according to claim 11, wherein, The driving electrode driven under the second timing condition will not be driven under the first timing condition.

13. The apparatus according to claim 10, wherein, When the switch control circuit detects the external proximity of the object, Under the first timing, the other end of the (n+k)th second driving electrode is connected to the second driving wiring, and the first end is connected to the second reference wiring. Under the second timing, the other end of the (n+k+1)th second driving wiring adjacent to the (n+k)th second driving electrode is connected to the second driving wiring, and the first end is connected to the second reference wiring, where k is a natural number greater than or equal to 1.

14. The apparatus according to claim 1, wherein, It also includes a switch control unit, which, when detecting the approach of the object, connects one end of each of the plurality of first drive electrodes, which are configured close to each other as a plurality of drive electrodes, to the first drive wiring, and connects the other end of each of them to the first reference wiring. When the switch control unit detects the approach of the object, at a first timing, it connects one end of the (n+1)th first driving electrode to the first driving wiring and the other end to the first reference wiring. In the second timing immediately following the first timing, one end of the (n+2)th second driving electrode adjacent to the (n+1)th first driving electrode is connected to the first driving wiring, and the other end is connected to the first reference wiring.

15. A device for detecting the position of an object, comprising: Multiple driving electrodes, each extending in a first direction, are arranged in a detection region for detecting external objects approaching in a second direction intersecting the first direction; Multiple detection electrodes, each extending in the second direction and arranged in the detection region in the first direction; A first driving wiring extends in the second direction and faces one end of the plurality of driving electrodes; A second driving wiring extends in the second direction and faces the other end of the plurality of driving electrodes; A first reference wiring extends in the second direction and faces the other end of the plurality of driving electrodes; A second reference wiring extends in the second direction and faces one end of the plurality of driving electrodes; Multiple first switching circuits are coupled to one end of the multiple driving electrodes, between the first driving wiring and the second reference wiring; as well as Multiple second switching circuits are coupled to the other end of the multiple driving electrodes, between the second driving wiring and the first reference wiring.

16. A display device, comprising: A pixel array, comprising multiple pixels arranged in a matrix; Multiple driving electrodes, each extending in a first direction and arranged in a detection region for detecting an externally proximate object in a second direction intersecting the first direction; Multiple detection electrodes, each extending in the second direction and arranged in the detection region in the first direction; A first driving wiring extends in the second direction to face one end of the plurality of driving electrodes; A second driving wiring extends in the second direction to face the other end of the plurality of driving electrodes; A first reference wiring extends in the second direction to face the other end of the plurality of drive electrodes; A second reference wiring extends in the second direction to face one end of the plurality of driving electrodes; Multiple first switching circuits are coupled between one end of the driving electrode, the first driving wiring and the second reference wiring; as well as Multiple second switching circuits are coupled between the other end of the driving electrode, the second driving wiring, and the first reference wiring. The plurality of driving electrodes include a first driving electrode and a second driving electrode into which current flows when the external object is detected to be near it.

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