JP2018037074A - Display device, input detection device, and electronic device - Google Patents

Abstract

An input detection device capable of generating a magnetic field similar to that at the center of a display region in an end portion of the display region, for example, in an electromagnetic induction type in-cell touch panel that generates a magnetic field for touch detection in the display device I will provide a. An input detection device includes a plurality of first drive electrodes TL (0) to TL (p) arranged in a detection region, a second drive electrode TL (dU) arranged in a frame region, and a second A second drive circuit for driving the drive electrode TL (dU). The plurality of first drive electrodes TL (0) to TL (p) and the second drive electrode TL (dU) are arranged in a second direction that extends in the first direction and intersects the first direction. The second drive electrode TL (dU) and the second drive circuit are arranged in the first direction. [Selection] Figure 12

Description

  The present invention relates to a display device, an input detection device, and an electronic device, and more particularly, to a display device having a touch detection function capable of detecting the proximity of an external object, the input detection device, and the electronic device.

  In recent years, an input detection device having a touch detection function capable of detecting the proximity (hereinafter also including contact) of an external object, called a so-called touch panel, has attracted attention as an input detection device. The touch panel is mounted on a display device such as a liquid crystal display device or integrated with the liquid crystal display device, and is provided as a display device with a touch detection function.

  As an external object, for example, there is a touch panel that makes it possible to use a pen. By using a pen, for example, a small area can be designated or handwritten characters can be input. There are various techniques for detecting a touch with a pen. One of various technologies is an electromagnetic induction method. The electromagnetic induction method can achieve high accuracy and high pen pressure detection accuracy, and can also realize a hovering detection function in which an external object is separated from the touch panel surface. Technology.

  In addition, there is a touch detection device capable of detecting a finger or the like as an external object. In this case, since the detection target is different from the pen, a method different from the electromagnetic induction method is adopted as a technique for detecting a touch. For example, there is a method for detecting an optical change, a resistance value change, or an electric field change caused by a touch of a finger or the like. Among these methods, a method for detecting a change in an electric field is, for example, a capacitance method using a capacitance. The electrostatic capacity method has a relatively simple structure and low power consumption, and thus is used for a portable information terminal and the like.

  A technique related to an electromagnetic induction type touch panel is described in Patent Document 1, for example.

JP-A-10-49301

  The display device with a touch detection function includes a so-called in-cell type display device in which a touch panel is integrated with the display device, and a so-called on-cell type display device in which the touch panel is mounted on the display device.

  When performing electromagnetic induction touch detection in an in-cell type display device, it is conceivable that the common electrode in the display area is a drive electrode for generating a magnetic field. However, in this case, there is a problem that a magnetic field is less likely to be generated in the common electrode region at or near the extreme end of the display region than in the center of the display region.

  Patent Document 1 describes an in-cell type touch panel in which a segment electrode and a common electrode of a liquid crystal panel are used as detection electrodes for magnetic field touch detection, but generating a magnetic field using an electrode in the liquid crystal panel, There is no description or suggestion about the problem in that case.

  An object of the present invention is to generate a magnetic field similar to that at the center of a display area at an end portion of the display area in an electromagnetic induction type in-cell touch panel that generates a magnetic field for touch detection in a display device, for example. An object of the present invention is to provide an input detection device.

  An input detection device according to an aspect of the present invention includes a plurality of first drive electrodes disposed in a detection region, a second drive electrode disposed in a frame region, and a second drive circuit that drives the second drive electrode. . The plurality of first drive electrodes and the second drive electrodes are arranged in a second direction that extends in the first direction and intersects the first direction, and the second drive electrode and the second drive circuit in the frame region Arranged in one direction.

(A) And (B) is the top view and sectional drawing which show the structure of a display apparatus. (A)-(C) are explanatory drawings which show the principle of a magnetic field detection. (A)-(C) are explanatory drawings which show the principle of an electric field detection. 1 is a block diagram illustrating a configuration of a display device according to Embodiment 1. FIG. FIG. 3 is a plan view illustrating a configuration of a module according to the first embodiment. 1 is a plan view illustrating a configuration of a display device according to Embodiment 1. FIG. FIG. 6 is a plan view illustrating an operation of the display device according to the first embodiment. FIG. 6 is a plan view illustrating an operation of the display device according to the first embodiment. 3 is a plan view showing a configuration of a drive circuit and drive electrodes according to Embodiment 1. FIG. 3 is a plan view showing a configuration of a drive circuit and drive electrodes according to Embodiment 1. FIG. 3 is a plan view showing a circuit arrangement of the display device according to Embodiment 1. FIG. 7 is a plan view showing a circuit arrangement of a display device according to a modification of the first embodiment. FIG. 10 is a plan view showing the configuration and operation of a display device according to Embodiment 2. FIG. 10 is a plan view showing the configuration and operation of a display device according to Embodiment 2. FIG. 10 is a plan view showing the configuration and operation of a display device according to Embodiment 2. FIG. 1 is a perspective view showing an electronic device according to Embodiments 1 and 2. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate changes while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with actual aspects for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited. It is not limited.

  In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate. In the following description, a liquid crystal display device with a touch detection function will be described as an example of the input detection device, but the present invention is not limited to this. For example, the input detection device may be an OLED display device with a touch detection function, or a touch panel that does not have a display function.

(Embodiment 1)
In the first embodiment, a display device capable of detecting contact or proximity of both a pen and a finger, that is, a display device including an electromagnetic induction type and a capacitance type input device will be described. The display device of Embodiment 1 can perform a display operation, an electromagnetic induction type input detection operation, and a capacitance type input detection operation in a time-sharing manner with the same device configuration. The display device according to the first embodiment is a display device that displays an image using liquid crystal, but is not limited to a liquid crystal, and may display an image using an OLED or the like.

<Basic configuration of display device>
FIG. 1 is a diagram schematically illustrating a configuration of a display device. In FIG. 1, reference numeral 1 denotes a display device, FIG. 1A is a plan view showing a plane of the display device 1, and FIG. 1B is a cross-sectional view showing a cross section of the display device 1. is there. The display device 1 includes a first substrate TGB, a layer (layer) stacked on the first substrate TGB, a color filter CFT, a second substrate CGB, and a layer (layer) stacked on the second substrate CGB. The first substrate TGB and the second substrate CGB are insulating substrates. For example, the first substrate TGB and the second substrate CGB are glass substrates or film substrates.

  In FIG. 1A, TL (0) to TL (p) indicate drive electrodes formed by layers formed on the first main surface TSF1 of the first substrate TGB. The drive electrodes TL (0) to TL (p) function as a common electrode for display operation, a drive electrode for generating a magnetic field, and a drive electrode for generating an electric field. Further, RL (0) to RL (p) indicate detection electrodes configured by layers formed on the first main surface CSF1 of the second substrate CGB. The detection electrodes RL (0) to RL (p) function as a detection electrode for magnetic field detection and a detection electrode for electric field detection. As shown in FIG. 1B, the first substrate TGB and the second substrate CGB in FIG. 1A have a liquid crystal layer sandwiched between the first main surface TSF1 of the first substrate TGB and the second substrate CGB. It arrange | positions so that 2nd main surface CSF2 may oppose.

  As shown in FIG. 1B, between the first main surface TSF1 of the first substrate TGB and the second main surface CSF2 of the second substrate CGB, the drive electrodes TL (0) to TL (n + 2), the liquid crystal layer, and A color filter CFT is disposed. A plurality of detection electrodes RL (0) to RL (p) shown in FIG. 1A and a polarizing plate are disposed on the first main surface CSF1 of the second substrate CGB. In FIG. 1B, reference numeral 13 denotes a unit detection circuit connected to the detection electrode RL (n).

  In this specification, a state in which the display device 1 is viewed from a direction perpendicular to the first main surfaces CSF1 and TSF1 in FIG. When viewed in a plan view, the drive electrodes TL (0) to TL (p) extend in the row direction (lateral direction) on the first main surface TSF1 of the first substrate TGB as shown in FIG. And arranged in parallel to the column direction (vertical direction). Further, the detection electrodes RL (0) to RL (p) extend in the column direction (vertical direction) and in the row direction on the first main surface CSF1 of the second substrate CGB as shown in FIG. It is arranged in parallel to (lateral direction).

  The drive electrodes TL (0) to TL (p) and the detection electrodes RL (0) to RL (p) are electrically separated from each other via the second substrate CGB, the liquid crystal layer, and the like. At this time, the capacitance formed between the drive electrode and the detection electrode is indicated by a broken line in FIG.

  In this embodiment, the drive electrodes TL (0) to TL (p) and the detection electrodes RL (0) to RL (p) are arranged orthogonal to each other. It may be arranged to cross.

<Principle of magnetic field detection>
FIG. 2 is an explanatory diagram showing the principle of magnetic field detection. The magnetic field detection period includes a magnetic field generation period for generating a magnetic field and a magnetic field detection period for detecting the magnetic field. 2A and 2C show the operation during the magnetic field generation period, and FIG. 2B shows the operation during the magnetic field detection period.

  In the present embodiment, drive electrodes TL (0) to TL (p) shown in FIG. 1 are used as drive electrodes for generating a magnetic field. In the magnetic field generation period, among the drive electrodes TL (0) to TL (p) that are arranged in parallel, predetermined drive electrodes that are arranged apart from each other are connected in series, and are different at respective end portions. By supplying a driving voltage, a current is passed through the driving electrode to generate a magnetic field. For example, the right ends of the drive electrodes TL (0) and TL (2) shown in FIG. 1 are electrically connected. Next, the first voltage Vs is supplied from the left end of the drive electrode TL (0), and the magnetic field drive signal having a voltage value different from the first voltage Vs is supplied from the left end of the drive electrode TL (2). As a result, a current flows through the drive electrodes TL (0) and TL (2), and a magnetic field is generated around the region of the drive electrode TL (1) sandwiched therebetween. Here, the magnetic field drive signal is a signal whose voltage changes periodically. At this time, the drive electrodes TL (0) and TL (2) can be regarded as magnetic field generating coils. The first voltage Vs is, for example, a ground voltage or a reference voltage.

  In FIG. 2A, GX (n−1) indicates a magnetic field generating coil constituted by drive electrodes TL (0) and TL (2), and each of GX (n) to GX (n + 4) is a magnetic field. Similarly to the generation coil GX (n−1), a magnetic field generation coil constituted by the drive electrodes TL (1) and TL (3) to TL (p) is shown.

  In FIG. 2A, the capacitive element C and the coil L1 are connected in parallel so as to form a resonance circuit and are built in the pen Pen. In the magnetic field generation period, the first voltage Vs is supplied to one end of each of the magnetic field generation coils GX (n−1) to GX (n + 3). At this time, when the magnetic field driving signal CLK is supplied to the other end of the magnetic field generating coil GX (n), the magnetic field generating coil GX (n) generates a magnetic field φ1 corresponding to the voltage change of the magnetic field driving signal CLK. . If the pen Pen is close to the magnetic field generating coil GX (n), the magnetic field generating coil GX (n) and the coil L1 are electromagnetically coupled, and an induced voltage due to mutual induction is generated in the coil L1 by the magnetic field φ1. The capacitive element C is charged.

  In the magnetic field detection period, the magnetic field is detected using the detection electrodes RL (0) to RL (p) shown in FIG. Among the detection electrodes RL (0) to RL (p) arranged in parallel to each other, predetermined detection electrodes that are separated from each other are selected and connected in series to constitute a magnetic field detection coil. For example, a magnetic field detection coil configured by electrically connecting the detection electrodes RL (0) and RL (3) at the upper ends in FIG. 1 has a region of the detection electrodes RL (1) and RL (2). A magnetic field is detected at the center.

  In FIG. 2B, DY (n−2) indicates a magnetic field detection coil constituted by the detection electrodes RL (0) and RL (3), and DY (n−1) to DY (n + 1) are Similarly, a magnetic field detection coil constituted by detection electrodes RL (2) to RL (p) is shown. During the magnetic field detection period, the first voltage Vs is supplied to one end of each of the magnetic field detection coils DY (n−1) to DY (n + 1), and the signal Rx (n−2) at each other end. ) To Rx (n + 1) are supplied to the unit detection circuit.

  If the capacitive element C is charged during the magnetic field generation period, the coil L1 incorporated in the pen responds to the resonance frequency of the resonance circuit according to the charge charged in the capacitive element C during the magnetic field detection period. Is generated. In FIG. 2B, the pen is inside the magnetic field detection coil DY (n), that is, the center (one-dot chain line) of the coil L1 exists. Therefore, electromagnetic coupling occurs between the magnetic field detection coil DY (n) and the coil L1, and an induced voltage is generated in the magnetic field detection coil DY (n) due to mutual induction. As a result, the signal Rx (n) at the other end of the magnetic field detection coil DY (n) changes according to the amount of charge charged in the capacitive element C. The unit detection circuit connected to the magnetic field detection coil DY (n) outputs the change in the signal Rx (n) as a detection signal. This makes it possible to extract whether or not the pen Pen is close (touched) and the coordinates. In addition, since the detection signal changes according to the amount of charge, it is possible to obtain the distance from the pen Pen.

  FIG. 2C shows a magnetic field generation period that has shifted to FIG. 2B. The difference from FIG. 2A is that the magnetic field drive signal CLK is supplied to the magnetic field generating coil GX (n + 1). Since the position of the pen Pen has not changed, no induced voltage is generated in the coil L1 and the capacitor C is not charged during the magnetic field generation period shown in FIG. Thereby, it is detected that the pen Pen is not in close proximity in the magnetic field detection period that transitions following FIG. Thereafter, the pen Pen is detected in the same manner.

<Principle of electric field detection>
FIG. 3 is an explanatory diagram showing the principle of electric field detection. In FIG. 3A, each of 12-0 to 12-p represents a unit drive circuit that outputs an electric field drive signal, and each of 13-0 to 13-p represents a unit detection circuit. In FIG. 3A, the pulse signal surrounded by a solid line ◯ shows the waveform of the electric field drive signal Tx (2) supplied to the drive electrode TL (2). As an external object, a finger is shown as FG.

  When the electric field drive signal Tx (2) is supplied to the drive electrode TL (2), as shown in FIG. 3B, the drive electrode TL (2) and detection orthogonal to the drive electrode TL (2) are detected. An electric field is generated between the electrode RL (n). At this time, if the finger FG touches the vicinity of the drive electrode TL (2), an electric field is generated between the finger FG and the drive electrode TL (2), and the drive electrode TL (2) and the detection electrode RL. The electric field generated between (n) decreases. As a result, the amount of charge between the drive electrode TL (2) and the detection electrode RL (n) decreases. As a result, as shown in FIG. 3C, the amount of charge generated in response to the supply of the drive signal Tx (2) is ΔQ when the finger FG is touching compared to when not touching. Decrease. The charge amount difference appears as a voltage difference, is supplied to the unit detection circuit 13-n, and is output as a detection signal.

  Similarly, by supplying the electric field drive signal to other drive electrodes, the voltage change of the signal depending on whether or not the finger FG is touching is applied to the detection electrodes RL (0) to RL (p). Is generated and output as a detection signal. This makes it possible to extract whether or not the finger FG is touching and the coordinates.

  During the display operation, the drive electrodes TL (0) to TL (p) shown in FIG. 1 function as, for example, a common electrode, and the same display drive signal is supplied to all the drive electrodes.

<Overall configuration of display device>
FIG. 4 is a block diagram illustrating a configuration of the display device 1 according to the first embodiment. 4, the display device 1 includes a display panel (liquid crystal panel), a control device 3, a gate driver 4 (gate drivers 4L and 4R), and a touch control device 5. The display device 1 also includes first drive circuits DRVL and DRVR, second drive circuits DRVU and DRVD, and a detection circuit DET. The display panel includes a display area for displaying and a frame area around the display area. From the viewpoint of display, the display area is an active area, and the frame area surrounding the display area is an inactive area. In FIG. 4, 2 is a display area. The display area 2 is a detection area for magnetic field touch detection using an electromagnetic induction method and electric field touch detection using a capacitance method.

  The display area 2 has a pixel array in which a plurality of pixels are arranged in a matrix. In the pixel array, a plurality of signal lines, a plurality of pixel electrodes, a plurality of first drive electrodes, a plurality of scanning lines, and a plurality of detection electrodes are arranged. Referring to FIG. 4, in the pixel array, the signal lines SL (0) to SL (p) extend in the vertical direction (column direction) and are arranged in parallel in the horizontal direction (row direction). . The first drive electrodes TL (0) to TL (p) extend in the horizontal direction and are arranged in parallel in the vertical direction. The pixel electrodes are arranged in a matrix. Further, the scanning lines extend in the horizontal direction and are arranged in parallel in the vertical direction, and the detection electrodes RL (0) to RL (p) extend in the vertical direction and are arranged in parallel in the horizontal direction. . In this case, the pixel is arranged in a space formed by the intersection of the plurality of signal lines and the plurality of scanning lines. In the display period (display period), a pixel is selected by the signal line and the scanning line, and the voltage of the pixel electrode supplied via the signal line at that time and the first drive electrode are selected for the selected pixel. Thus, display according to the voltage difference between the pixel electrode and the first drive electrode is performed.

  The control device 3 receives the timing signal supplied to the external terminal Tt and the image information supplied to the input terminal Ti, forms an image signal according to the image information during the display period, and generates a plurality of signal lines SL ( 0) to SL (p). Further, the control device 3 receives the timing signal supplied to the external terminal Tt and the control signal SW from the touch control device 5, and forms various signals. In FIG. 4, only signals necessary for explanation among signals formed by the control device 3 are depicted as representatives. That is, the control device 3 forms the synchronization signal TSHD and the control signals CNTL and CNTR. Further, although not particularly limited, the control device 3 generates the drive signals TPL and TSV.

  The synchronization signal TSHD is a synchronization signal for identifying a display period for displaying in the display area 2 and a touch detection period for performing touch detection. The control device 3 controls the touch control device 5 so as to operate during the touch detection period by the synchronization signal TSHD.

  The gate driver 4 forms the scanning line signals Vss0 to Vssp according to the timing signal from the control device 3 and supplies them to the scanning lines in the display area 2 at the time of display. In the display period, a pixel connected to a scanning line to which a high-level scanning line signal is supplied is selected, and the selected pixel is then supplied to the signal lines SL (0) to SL (p). Display according to the image signal.

  The detection circuit DET detects a change in the signal at the detection electrodes RL (0) to RL (p) during the magnetic field touch detection by the electromagnetic induction method and the electric field touch detection by the capacitance method, and the detection signal Rx (0). Output as ~ Rx (p).

  The touch control device 5 receives the detection signals Rx (0) to Rx (p), extracts the coordinates of the touched position, and outputs them from the external terminal To. The touch control device 5 outputs the control signal SW and receives the synchronization signal TSHD, and operates in synchronization with the control device 3.

  The display area 2 has sides 2-U and 2-D parallel to the rows of the pixel array and sides 2-R and 2-L parallel to the columns of the pixel array. Here, the side 2-U and the side 2-D are sides facing each other, and a plurality of first drive electrodes TL (0) to TL (p) and a plurality of scans in the pixel array are provided between the two sides. A line is placed. Also, the side 2-R and the side 2-L are sides facing each other, and a plurality of signal lines SL (0) to SL (p) and a plurality of detection electrodes RL (in the pixel array are interposed between the two sides. 0) to RL (p) are arranged.

  The first drive circuit DRVL is disposed along the side 2-L of the display region 2 and is connected to one end of each of the first drive electrodes TL (0) to TL (p). Similarly, the first drive circuit DRVR is disposed along the side 2-R of the display region 2 and connected to the other end of each of the first drive electrodes TL (0) to TL (p).

  The first drive circuits DRVL and DRVR are connected to the first drive electrodes that connect the signal lines TPLL, TSVL, TPLR, and TSVR that supply drive voltages to the first drive electrodes TL (0) to TL (p) and the first drive electrodes. S1L, S2L, S1R, S2R shown in FIGS. 9 and 10 and a first selection circuit (SEL (0) to SEL shown in FIGS. 9 and 10) that selects the first drive electrode by switching the first switch. (P), SER (0) to SER (p)). The first selection circuit selects a desired first drive electrode from the first drive electrodes TL (0) to TL (p) based on the control signals CNTL and CNTR at the time of magnetic field touch detection and electric field touch detection. Form a signal. The first switch is switched by this selection signal to select the first drive electrode.

  The first drive circuits DRVL and DRVR select a desired first drive electrode from the first drive electrodes TL (0) to TL (p) and detect a magnetic field drive signal to the selected first drive electrode at the time of magnetic field touch detection. And the electric field drive signal is supplied to the selected first drive electrode even when electric field touch detection is performed.

  A second drive electrode TL (dU), which is a dummy drive electrode for generating a magnetic field, is disposed in a frame region (upper frame region) outside the display region 2. Similarly, a second drive electrode TL (dD), which is a magnetic field generating dummy drive electrode, is disposed in a frame region (lower frame region) outside the display region 2.

  Here, unlike the first drive electrodes TL (0) to TL (p), the magnetic field generating dummy drive electrodes are arranged outside the display region 2 and perform only the magnetic field generation operation and do not perform the display operation. Means an electrode. Further, although not necessarily limited, the electric field generating operation is not performed.

  The second drive circuit DRVU is disposed along the side 2-U of the display region 2, and is connected to one end and the other end of the second drive electrode TL (dU). Similarly, the second drive circuit DRVD is disposed along the side 2-D of the display region 2, and is connected to one end and the other end of the second drive electrode TL (dD).

  Similarly to the first drive circuits DRVL and DRVR, the second drive circuits DRVU and DRVR are connected to the signal lines TPLL, TSVL, TPLR, and TSVR that supply drive voltages to the second drive electrodes TL (dU) and TL (dD). A second switch for connecting the two drive electrodes (S1L, S2L, S1R, S2R shown in FIGS. 9 and 10) and a second selection circuit for selecting the second drive electrode by switching the second switch (FIGS. 9 and 10). SEL (dU), SER (dU), SEL (dD), and SER (dD)) illustrated in FIG. The second selection circuit is a selection that selects a desired second drive electrode from the second drive electrodes TL (dU) and TL (dD) based on the control signals CNTL and CNTR when magnetic field touch detection and electric field touch detection are performed. Form a signal. The second switch is switched by this selection signal to select the second drive electrode.

  The second drive circuit DRVU selects the second drive electrode TL (dU) in the magnetic field touch detection period and supplies a magnetic field drive signal. The second drive circuit DRVD selects the second drive electrode TL (dD) and supplies a magnetic field drive signal.

  In FIG. 4, each of TPLL, TPLR, TSVL, TSVR indicates a signal wiring. The signal lines TPLL and TSVL extend along the side 2-L of the display area 2. The signal lines TPLL and TSVL include end portions extending along the sides 2-U and 2-D of the display area 2. Similarly, the signal lines TPLR and TSVR extend along the side 2-R of the display area 2. The signal lines TPLR and TSVR include end portions extending along the sides 2-U and 2-D of the display region 2.

  The first drive circuit DRVL connects the selected first drive electrode to the signal wiring TPLL or TSVL at the time of magnetic field touch detection and electric field touch detection. Similarly, the first drive circuit DRVR connects the selected first drive electrode to the signal wiring TPLR or TSVR at the time of magnetic field touch detection and electric field touch detection. The second drive circuits DRVU and DRVD also connect the selected second drive electrode to the signal line TPLL or TSVL and the signal line TPLR or TSVR when the magnetic field touch is detected.

  The drive signals TPL and TSV formed by the control device 3 are supplied to the respective ends of the signal wirings TPLL, TPLR and TSVL, TSVR. At the time of magnetic field touch detection, the drive signals TPL and TSV propagating through the signal wirings TPLL, TPLR and TSVL, TSVR are supplied to the selected first drive electrode and second drive electrode, and a magnetic field is generated. In the electric field touch detection, the drive signals TPL and TSV propagating through the signal wirings TPLL, TPLR and TSVL, TSVR are supplied to the selected first drive electrode and second drive electrode, and an electric field is generated. .

<Module configuration of display device>
FIG. 5 is a schematic plan view showing an overall configuration of a module 500 on which the display device 1 according to the first embodiment is mounted. Although schematically, FIG. 5 is drawn to fit the actual arrangement. In the figure, reference numeral 501 denotes a region of the first substrate TGB shown in FIG. 1, and 502 denotes a region where the first substrate TGB and the second substrate CGB are stacked. In the module 500, the first substrate TGB is integrated in the regions 501 and 502. In the region 502, the second substrate CGB is mounted on the first substrate TGB so that the first main surface TSF1 of the first substrate TGB and the second main surface CSF2 of the second substrate CGB face each other. In FIG. 5, 500-U and 500-D indicate short sides of the module 500, and 500-L and 500-R indicate long sides of the module 500. For example, the control device 3 may be a driver IC, and the detection circuit DET may be built in the driver IC.

  The gate driver 4L and the first drive circuit DRVL shown in FIG. 4 are arranged in the area 502, the left frame area between the side 2-L of the display area 2 and the side 500-L of the module 500. Yes. In the right frame region between the side 2-R of the display region 2 and the side 500-R of the module 500, the gate driver 4R and the first drive circuit DRVR shown in FIG. 4 are arranged. In the upper frame region between the side 2-U of the display region 2 and the side 500-U of the module 500, the second drive circuit DRVU shown in FIG. 4 is arranged. In the lower frame region between the side 2-D of the display region 2 and the side 500-D of the module 500, the second drive circuit DRVD, the detection circuit DET, and the control device 3 shown in FIG. The detection circuit DET is configured by wiring and parts formed on the first main surface TSF1 of the first substrate TGB in the region 501. When viewed in a plan view, the control device 3 is mounted on the first substrate TGB so as to cover the detection circuit DET. In addition, wirings and components constituting the first drive circuits DRVL and DRVR and the second drive circuits DRVU and DRVD are also formed on the first main surface TSF1 of the first substrate TGB in the region 502.

  The detection signals Rx (0) to Rx (p) described in FIG. 4 are supplied to the touch control device 5 via the wiring in the flexible cable FB1. A flexible cable FB2 is connected to the region 501, and signals are transmitted and received between the touch control device 5 and the control device 3 via a connector CN provided on the flexible cable FB2.

  As described above, the display area 2 has a pixel array in which a plurality of pixels are arranged in a matrix, and the plurality of first drive electrodes TL (0) arranged along the rows of the pixel array. To TL (p) and scanning lines, a plurality of signal lines SL (0) to SL (p) and a plurality of detection electrodes RL (0) to RL (p) arranged along the columns of the pixel array. ing. FIG. 5 shows, as an example, two first drive electrodes TL (n) and TL (m), two signal lines SL (k) and SL (n), and three detection electrodes RL (n−2). ) To RL (n) are shown. In FIG. 5, the scanning lines are omitted, but the scanning lines extend in parallel with the illustrated first drive electrodes TL (n) and TL (m).

  Further, in FIG. 5, the pixel array is shown as a broken line PDM, and among the plurality of pixels arranged in the pixel array PDM, the pixels arranged at the four corners of the display area 2 are exemplified. A pixel disposed at the intersection of the first drive electrode and the signal line is indicated as Pix.

  As described above, the second drive electrodes TL (dU) and TL (dD), which are magnetic field generation dummy drive electrodes, are provided in the first and second frame regions outside the display region 2 as described above. It extends in parallel with the drive electrodes TL (0) to TL (p). When the extension direction of the first drive electrodes TL (0) to TL (p) and the second drive electrodes TL (dU) and TL (dD), that is, the lateral direction is viewed as the first direction, The first drive electrodes TL (0) to TL (p) and the second drive electrodes TL (dU) and TL (dD) are arranged in a second direction which is a vertical direction orthogonal (including an intersection).

  Each of the signal wirings TPLL and TSVL shown in FIG. 4 extends in the second direction in the frame region on the left side. The signal wirings TPLL and TSVL include ends extending in the first direction in the upper frame region and the lower frame region. Similarly, each of the signal wirings TPLR and TSVR extends in the second direction in the right-side frame region. The signal wirings TPLR and TSVR include ends extending in the first direction in the upper side frame region and the lower side frame region.

<Operation of display device>
The operation of the display device 1 according to the first embodiment will be described with reference to FIGS. FIG. 6 is a plan view showing the configuration of the display device 1 according to the first embodiment.

  In FIG. 6, TL (0) to TL (p) indicate the first drive electrodes arranged in parallel between the side 2-U and the side 2-D of the display region 2. TL (dU) is a region outside the display region 2 (upper frame region), and indicates a second drive electrode (a magnetic field generating dummy drive electrode) arranged along the side 2-U. , TL (dD) is a region outside the display region 2 (lower frame region) and indicates a second drive electrode (a magnetic field generating dummy drive electrode) disposed along the side 2-D.

  In FIG. 6, each of UDL (0) to UDL (p) and UDR (0) to UDR (p) represents a unit drive circuit. Each of the unit drive circuits UDL (0) to UDL (p) is arranged along the side 2-L of the display region 2 and corresponds to the first drive electrodes TL (0) to TL (p). . The unit drive circuits UDL (0) to UDL (p) are circuits that constitute the first drive circuit DRVL. Each of the unit drive circuits UDR (0) to UDR (p) is arranged along the side 2-R of the display region 2 and corresponds to the first drive electrodes TL (0) to TL (p). ing. The unit drive circuits UDR (0) to UDR (p) are circuits that constitute the first drive circuit DRVR.

  Each of UDL (dU), UDR (dU), UDL (dD), and UDR (dD) represents a unit drive circuit. Each of the unit drive circuits UDL (dU) and UDR (dU) is disposed along the side 2-U of the display region 2 and corresponds to the second drive electrode TL (dU). The unit drive circuits UDL (dU) and UDR (dU) are circuits that constitute the second drive circuit DRVU. Each of the unit drive circuits UDL (dD) and UDR (dD) is disposed along the side 2-D of the display region 2 and corresponds to the second drive electrode TL (dD). The unit drive circuits UDL (dD) and UDR (dD) are circuits that constitute the second drive circuit DRVD.

  7 and 8 are plan views showing the operation of the display device 1 according to the first embodiment. FIGS. 9 and 10 are plan views showing the configuration of the drive circuit and drive electrodes according to the first embodiment. 7 and 9 show a case where a magnetic field is generated in the first drive electrode TL (0) arranged closest to the side 2-U of the display area 2. FIG. 8 and 10 show a case where a magnetic field is generated in the first drive electrode TL (p) disposed closest to the side 2-D of the display region 2. FIG.

  9 and 10, the unit drive circuits UDL (0) to UDL (p), UDR (0) to UDR (p), UDL (dU), UDR (dU), UDL (dD) and UDR (dD) Each of the selection circuits SEL (0) to SEL (p), SER (0) to SER (p), SEL (dU), SER (dU), SEL (dD) and SER (dD), and these selection circuits Are provided with a pair of switches S1L, S2L, S1R, and S2R. The selection circuits SEL (0) to SEL (p) and SER (0) to SER (p) and a pair of switches S1L, S2L, S1R, and S2R corresponding to each of these selection circuits include a first drive circuit DRVL, A first selection circuit and a first switch constituting the DRVR. The selection circuits SEL (dU), SER (dU), SEL (dD), and SER (dD), and a pair of switches S1L, S2L, S1R, and S2R corresponding to each of these selection circuits are configured by the second drive circuit DRVU, It is the 2nd selection circuit and 2nd switch which comprise DRVD.

  Each of the selection circuits SEL (0) to SEL (p), SER (0) to SER (p), SEL (dU), SER (dU), SEL (dD) and SER (dD) The switches S1L, S2L, S1R and S2R corresponding to the selection circuit are switched to select the corresponding first drive electrodes TL (0) to TL (p), second drive electrodes TL (dU) and TL (dD). Each of the switches S1L, S2L, S1R, and S2R corresponding to each selection circuit is turned on by a selection signal from the corresponding selection circuit.

  The switches S1L corresponding to the selection circuits SEL (0) to SEL (p), SEL (dU), and SEL (dD) are turned on by the selection signal, so that the signal wiring TPLL and the corresponding first drive electrode TL (0) to TL (p), the second drive electrode TL (dU), and one end n1 of TL (dD) are connected. The switch S2L corresponding to the selection circuits SEL (0) to SEL (p), SEL (dU), and SEL (dD) is turned on by the selection signal, so that the signal wiring TSVL and the corresponding first drive electrode TL (0) to TL (p), the second drive electrode TL (dU), and one end n1 of TL (dD) are connected.

  The switches S1R corresponding to the selection circuits SER (0) to SER (p), SER (dU), and SER (dD) are turned on by the selection signal, so that the signal wiring TPLR and the corresponding first drive electrode TL (0) to TL (p), the second drive electrode TL (dU), and the other end n2 of TL (dD) are connected. The switch S2R corresponding to the selection circuits SER (0) to SER (p), SER (dU), and SER (dD) is turned on by the selection signal, so that the signal wiring TSVR and the corresponding first drive electrode TL (0) to TL (p), the second drive electrode TL (dU), and the other end n2 of TL (dD) are connected.

In the first embodiment, drive signal TPL supplied to signal lines TPLL and TPLR is a DC voltage. The DC voltage drive signal TPL is a signal of the first voltage Vs such as a ground voltage, for example. The drive signal TSV supplied to the signal wirings TSVL and TSVR is an alternating voltage. The AC voltage drive signal TSV is a first voltage such as a ground voltage.
This is a signal that alternately alternates between the voltage Vs and a second voltage Vd that is higher than the first voltage Vs.

  7 and 9 are plan views showing a case where a magnetic field is generated in the first drive electrode TL (0) arranged closest to the side 2-U of the display region 2. FIG. In the magnetic field generation period, two second drive electrodes TL (dU) and first drive electrodes TL (1) that are spaced apart so as to sandwich the first drive electrode TL (0) corresponding to the region where the magnetic field is generated. ) Are selected by the corresponding unit drive circuits UDL (dU), UDR (dU), UDL (1) and UDR (1).

  At this time, the second drive electrode TL (dU) is controlled by controlling each unit drive circuit so that currents in opposite directions flow through the second drive electrode TL (dU) and the first drive electrode TL (1). ) And a region sandwiched between the first drive electrodes TL (1) can be generated.

  That is, at this time, it can be considered that the magnetic field generating coil described in FIG. 2 is configured by the second drive electrode TL (dU) and the first drive electrode TL (1). In FIG. 2, the drive electrodes arranged apart from each other are connected in series at either end to form a loop-shaped coil, but the second drive electrodes arranged parallel to each other as shown in FIG. Even if TL (dU) and the first drive electrode TL (1) are not directly electrically connected, a strong magnetic field can be formed by flowing currents in opposite directions. Such a display device does not require a battery for the pen, and the detection sensitivity in the display area plane is uniform.

  The unit drive circuit UDL (dU) turns on the switch S2L by the selection signal of the selection circuit SEL (dU), and connects the selected second drive electrode TL (dU) to the signal line TSVL. Similarly, the unit drive circuit UDR (dU) turns on the switch S1R by a selection signal from the selection circuit SER (dU), and connects the selected second drive electrode TL (dU) to the signal line TPLR. In the selected second drive electrode TL (dU), the second voltage Vd is supplied from the signal line TSVL to one end n1, and the first voltage Vs is supplied from the signal line TPLR to the other end n2. . In FIG. 9, the second voltage Vd is indicated by +, and the first voltage Vs is indicated by 0.

  At the same time, the unit drive circuit UDR (1) turns on the switch S2R by the selection signal of the selection circuit SER (1), and connects the selected first drive electrode TL (1) to the signal line TSVR. Similarly, the unit drive circuit UDL (1) turns on the switch S1L according to the selection signal of the selection circuit SEL (1), and connects the selected first drive electrode TL (1) to the signal line TPLL. In the selected first drive electrode TL (1), the other end n2 is supplied with the second voltage Vd from the signal line TSVR, and the other end n1 is supplied with the first voltage Vs from the signal line TPLL. .

  As a result, the current I1 indicated by the arrow flows in the second drive electrode TL (dU) from one end n1 to the other end n2 by the voltage difference, and a magnetic field φ1 is generated. At the same time, the current I2 indicated by the arrow flows in the first drive electrode TL (1) from the other end n2 toward the one end n1 by the voltage difference, and a magnetic field φ2 is generated. The magnetic field φ1 generated by the second drive electrode TL (dU) and the magnetic field φ2 generated by the first drive electrode TL (1) are superimposed in the region of the first drive electrode TL (0), which is strong. A magnetic field can be generated in the region of the first drive electrode TL (0). As a result, when the magnetic field is generated around the first drive electrode TL (0) arranged closest to the side 2-U of the display area 2, the vicinity of the center of the display area 2, for example, the first drive electrode TL is generated. It is possible to generate a magnetic field having the same strength as (4).

  In this way, a magnetic field is generated in the display device, and when the pen containing the coil and the capacitive element is brought close to the display area of the display device, the capacitive element of the coil is charged to generate a magnetic field. For example, the presence / absence of the pen and the coordinates are calculated by detecting with the detection electrode RL arranged in the display device.

  8 and 10 are plan views showing a case where a magnetic field is generated in the first drive electrode TL (p) arranged closest to the side 2-D of the display region 2. FIG. In the magnetic field generation period, two first drive electrodes TL (p−1) and second drive electrodes TL (dD) arranged so as to sandwich the first drive electrode TL (p) corresponding to the region where the magnetic field is generated. Are selected by the corresponding unit drive circuits UDL (p−1), UDR (p−1), UDL (dD), and UDR (dD).

  The unit drive circuit UDL (p-1) turns on the switch S2L by the selection signal of the selection circuit SEL (p-1), and connects the selected first drive electrode TL (p-1) to the signal wiring TSVL. . Similarly, the unit drive circuit UDR (p−1) turns on the switch S1R by the selection signal of the selection circuit SER (p−1), and connects the selected first drive electrode TL (p−1) to the signal line TPLR. Connect to. In the selected first drive electrode TL (p−1), the second voltage Vd is supplied from the signal wiring TSVL to one end n1, and the first voltage Vs is supplied from the signal wiring TPLR to the other end n2. Is done. In FIG. 10, the second voltage Vd is indicated by +, and the first voltage Vs is indicated by 0.

  At the same time, the unit drive circuit UDR (dD) turns on the switch S2R by the selection signal of the selection circuit SER (dD), and connects the selected second drive electrode TL (dD) to the signal wiring TSVR. Similarly, the unit drive circuit UDL (dD) turns on the switch S1L by the selection signal of the selection circuit SEL (dD), and connects the selected second drive electrode TL (dD) to the signal line TPLL. In the selected second drive electrode TL (dD), the second voltage Vd is supplied from the signal line TSVR to the other end n2, and the first voltage Vs is supplied from the signal line TPLL to the other end n1. .

  Thus, the current I1 indicated by the arrow flows through the first drive electrode TL (p−1) from one end n1 to the other end n2 by the voltage difference, and a magnetic field φ1 is generated. At the same time, the current I2 indicated by the arrow flows through the second drive electrode TL (dD) from the other end n2 toward the one end n1, and a magnetic field φ2 is generated. The magnetic field φ1 generated by the first drive electrode TL (p−1) and the magnetic field φ2 generated by the second drive electrode TL (dD) are superimposed in the region of the first drive electrode TL (p). A strong magnetic field can be generated in the region of the first drive electrode TL (p). As a result, when the magnetic field is generated around the first drive electrode TL (p) disposed closest to the side 2-D of the display area 2, the magnetic field is centered on the drive electrode near the center of the display area 2. It is possible to generate a magnetic field having the same strength as when generating

  In the first embodiment, by disposing the second drive electrodes TL (dU) and TL (dD) in the frame area, the display area 2 (detection area) reduces the area where the detection accuracy decreases, and the display area It is possible to make the detection sensitivities of the end portion and the center of 2 uniform. For example, when the second drive electrodes TL (dU) and TL (dD) in the frame region are not arranged, the first drive electrode TL (0) arranged close to the side 2-U of the display region 2 When the magnetic field is generated around the first drive electrode TL (0), the drive electrode close to the first drive electrode TL (0) is only the first drive electrode TL (1), and therefore only the first drive electrode TL (1) is selected. It will be. However, as described above, in order to generate a strong magnetic field, it is necessary to simultaneously select a pair of drive electrodes that are arranged apart from each other and to flow currents in opposite directions, and this occurs with only one drive electrode. The magnetic field becomes weak. Similarly, when generating a magnetic field centered on the first drive electrode TL (p) arranged close to the side 2-D of the display region 2, the drive electrode close to the first drive electrode TL (p) Since only the first drive electrode TL (p-1) is present, the magnetic field generated around the first drive electrode TL (p) is weakened.

  On the other hand, when a magnetic field is generated near the center of the display region 2, for example, the first drive electrode TL (4), the pair of drive electrodes TL (3), TL ( Since 5) is selected at the same time, the difference in magnetic field strength generated between the end portion and the center of the display area 2 is large, and the touch detection sensitivity becomes nonuniform.

<Circuit arrangement of display device>
11 and 12 are diagrams for explaining the circuit arrangement of the display device 1. Of these, FIG. 11 is a plan view showing the circuit arrangement of the display device 1 according to the first embodiment. These are top views which show the circuit arrangement | positioning of the display apparatus 1 concerning a modification.

  First, the circuit arrangement of the display device 1 according to the first embodiment will be described. FIG. 11 is a plan view showing a circuit arrangement of the display device according to the first embodiment.

  In FIG. 11, the first drive electrodes TL (0) to TL (p) extend in the horizontal direction (first direction) and are arranged in parallel to the vertical direction (second direction) in the display region 2. . The second drive electrode TL (dU) extends in the lateral direction in the upper frame region outside the display region 2, and the second drive electrode TL (dD) extends from the lower side outside the display region 2. In the frame area, it extends in the lateral direction.

  In FIG. 11, the selection circuits SEL (0) to SEL (p) constituting the unit drive circuits UDL (0) to UDL (p) and the pair of switches S1L and S2L corresponding to each of these selection circuits are In the left frame region outside the display region 2, they are arranged along the vertical direction at positions corresponding to the first drive electrodes TL (0) to TL (p). The selection circuits SER (0) to SER (p) constituting the unit drive circuits UDR (0) to UDR (p) and a pair of switches S1R and S2R corresponding to each of these selection circuits are provided outside the display area 2. Are arranged at positions corresponding to the first drive electrodes TL (0) to TL (p) along the vertical direction. Note that unit gate drivers UGL (0) to UGL (p) and UGR (corresponding to the first drive electrodes TL (0) to TL (p), respectively, are provided in the left frame region and the right frame region outside the display region 2. 0) to UGR (p) are also arranged.

  Further, in FIG. 11, the selection circuits SEL (dU) and SER (dU) constituting the unit drive circuits UDL (dU) and UDR (dU), and a pair of switches S1L, S2L corresponding to each of these selection circuits, S <b> 1 </ b> R and S <b> 2 </ b> R are respectively arranged in the upper frame region outside the display region 2 along the horizontal direction. The selection circuits SEL (dD) and SER (dD) constituting the unit drive circuits UDL (dD) and UDR (dD) and a pair of switches S1L, S2L, S1R and S2R corresponding to each of these selection circuits are displayed. In the lower frame area outside the area 2, they are arranged along the horizontal direction.

  In the display device according to the first embodiment shown in FIG. 11, the second drive electrode TL (dU) is arranged closest to the side 2-U of the display region 2 in the upper frame region outside the display region 2. The switches S1L and S2L and the switches S1R and S2R are arranged on the upper side (in the direction of the side 500-U of the module 500), and the selection circuit SEL (dU) and the selection circuit SER (dU) are arranged on the upper side. Yes. According to such an arrangement, the length L11 between the side 2-U of the display area 2 and the side 500-U of the module 500 becomes long, which causes an increase in the upper side frame area.

  In other words, in the display device 1 according to the first embodiment, when electromagnetic induction type touch detection is performed in an in-cell type display device, the upper edge around the display region 2 is used as an auxiliary electrode for generating a magnetic field at the end of the display region 2. Second drive electrodes (magnetic field generating dummy drive electrodes) TL (dU) and TL (dD) are arranged in the frame region and the lower frame region. In this case, a drive circuit for driving the second drive electrode TL (dU) disposed in the upper frame region must be disposed in the upper frame region, which causes an increase in the upper frame region.

  Therefore, in the modification, in the case of the in-cell type display device, in order to provide a display device having an input detection device that suppresses an increase in the upper frame region, the device as shown in FIG. 12 is devised. FIG. 12 is a plan view showing a circuit arrangement of the display device 1 according to the first embodiment. In the description with reference to FIG. 12, differences from the display device according to the first embodiment shown in FIG. 11 will be mainly described.

  In the first embodiment, as shown in FIG. 12, the shape and size of the second drive electrode TL (dU) in the upper frame region are devised to select the selection circuit SEL (for driving the second drive electrode TL (dU)). dU) and SER (dU) and the arrangement of the switches S1L, S2L, S1R and S2R. When compared with the first drive electrodes TL (0) to TL (p), the second drive electrode TL (dU) has a shorter length in the horizontal direction and a lengthwise direction when viewed in a plan view. The length is also shortened. In FIG. 12, the second drive electrode TL (dU) is shown as a horizontal length L2 and a vertical length L3, and the first drive electrodes TL (0) to TL (p) are shown in the horizontal direction. The length L4 is indicated by the length L5 in the vertical direction, the length L2 is shorter than the length L4, and the length L3 is shorter than the length L5. Furthermore, the second drive electrode TL (dU) has a convex shape that is convex downward, with the lower left corner and lower right corner of the rectangle cut out when viewed in plan view. Switches S1L and S2L and switches S1R and S2R are arranged in the notched portions of the lower left corner and the lower right corner of the convex shape of the second drive electrode TL (dU), respectively. In addition, the selection circuit SEL (dU) and the selection circuit SER (dU) are respectively arranged on the left and right portions of the second drive electrode TL (dU) that are vacated by shortening the lateral length.

  In other words, the selection circuit SEL (dU) and the switches S1L and S2L are arranged in a space formed by notching so as to narrow a part of the width of the second drive electrode TL (dU). In the upper frame region, the second drive electrodes TL (dU) are arranged so as to be arranged in the horizontal direction (part A in the drawing). Further, in the second drive electrode TL (dU), the length in the vertical direction is increased in a portion where the selection circuit SEL (dU) and the switches S1L and S2L and the selection circuit SER (dU) and the switches S1R and S2R are not provided (convex). The length of the convex part of the mold shape, part B in the figure). Further, in the second drive electrode TL (dU), the lengths of the switches S1L and S2L and the upper portions of the switches S1R and S2R are shortened in the vertical direction (the length of the convex-shaped base portion, C portion in the drawing). This portion may have a short length as long as it can play a role of drawing the wiring from the switches S1L and S2L and the switches S1R and S2R to the second drive electrode TL (dU). Note that “long or short” in a plan view can also be said to be thick or thin in terms of a plan view and a cross-sectional view.

  Since the second drive electrode TL (dU) is disposed in the frame area and does not perform display operation or electric field generation operation, it is not necessary to have the same pattern and wiring width as the first driving electrode, and the wiring width is larger than the first driving electrode. Or a pattern shape including a notch or the like.

  Further, since the second drive electrode TL (dU) is disposed in the frame region and is not visually recognized, the second drive electrode TL (dU) may be formed of a light-shielding metal material or the like. The second drive electrode TL (dU) in the upper frame region has a smaller electrode width, length, and area than the first drive electrodes TL (0) to TL (p) in the display region 2. The drive electrode is formed of a transparent electrode such as ITO, and the second drive electrode is formed of a metal material having a resistance lower than that of ITO, thereby flowing to the first drive electrodes TL (0) to TL (p) in the display region 2. It can be set so that the same amount of current as the current flows through the second drive electrode. For example, the second drive electrode TL (dU) can be formed of Ti (titanium), AL (aluminum), or the like.

  In addition, it is calculated that the current flows through the signal wirings TPLL and TSVL and the signal wirings TPLR and TSVR themselves to generate a magnetic field, and the second drive electrode TL (dU), the signal wirings TPLL and TSVL, the signal wiring TPLR In addition, it is designed so that a necessary current value can flow in total with TSVR. That is, the signal wirings TPLL and TSVL and the signal wirings TPLR and TSVR include a portion (A portion in the drawing) extending in the extending direction of the first drive electrode, that is, the direction along the side 2-U in the upper side frame region. Signal wiring can also be used as auxiliary wiring for magnetic field generation. Accordingly, the total amount of current flowing through the signal lines TPLL and TSVL, the signal lines TPLR and TSVR, and the second drive electrode TL (dU), and the first drive electrodes TL (0) to TL (p) in the display region 2 are displayed. The amount of current flowing per line can be made equal. To be equal includes, for example, that the amount of current flowing per one first driving electrode is within a predetermined range such as 0.8 to 1.2 times. By doing so, it is possible to generate a magnetic field having the same strength as that of the first drive electrode by using the second electrode having an area smaller than that of the first drive electrode and a non-constant electrode width.

  As described above, in the display device 1 according to the modification shown in FIG. 12, the second drive electrode TL (() is arranged so as to be arranged along the side 2-U of the display region 2 in the upper frame region outside the display region 2. In addition to dU), a selection circuit SEL (dU) and switches S1L and S2L, and a selection circuit SER (dU) and switches S1R and S2R can be arranged, respectively. According to such an arrangement, the length L1 between the side 2-U of the display area 2 and the side 500-U of the module 500 is shorter than the length L11 of the first embodiment shown in FIG. The increase in the upper frame region can be suppressed. As a result, the upper frame region can be narrowed.

  Note that the lower frame region outside the display region 2 is assumed to be relatively wide, and there is a space for arranging the selection circuit SEL (dU) and the switches S1L and S2L, and the selection circuit SER (dU) and the switches S1R and S2R. Therefore, the arrangement is the same as that of the first embodiment shown in FIG. Not limited to this, the lower side may be arranged in the same manner as the upper side of the modified example. Further, only the lower side may be arranged in the same manner as the upper side of the modified example, and the upper side may be arranged in the same manner as the lower side of the first embodiment.

<Effect>
According to the display device 1 according to the first embodiment, in the case of the in-cell type display device, it is possible to provide a display device having an electromagnetic induction type input detection device with uniform detection sensitivity in the display region. Further, according to the display device 1 according to the modification, it is possible to provide a display device having an electromagnetic induction type input detection device that suppresses an increase in the upper frame region outside the display region 2. In particular, the second drive electrode TL (dU), the selection circuit SEL (dU), the SER (dU), the switches S1L, S2L, S1R, S2R and the signal lines TPLL, TSVL, TPLR, in the upper frame region outside the display region 2, By devising the arrangement of TSVR, a desired amount of magnetic field can be generated in the frame region even when the second drive electrode having a smaller area than the first drive electrode in the display region is used.

(Embodiment 2)
A display device 1 according to the second embodiment will be described with reference to FIGS. 13 to 15 are plan views showing the configuration and operation of the display device 1 according to the second embodiment. In the second embodiment, differences from the first embodiment described above will be mainly described.

  In the first embodiment, one second drive electrode TL (dU) is arranged in the upper frame region around the display region 2, and one second drive electrode TL (dD) is arranged in the lower frame region. ing. On the other hand, in the second embodiment, in order to apply the concept of driving a plurality of drive electrodes as a bundle, as shown in FIGS. The second drive electrodes TL (dU1) to TL (dU3) are arranged, and the three second drive electrodes TL (dD1) to TL (dD3) are arranged in the lower frame region.

  In order to increase the strength of the generated magnetic field during the magnetic field generation period, when driving a plurality of drive electrodes as a bundle, they are arranged so as to sandwich the region of the non-selected drive electrode that is the center of the generated magnetic field. The plurality of drive electrodes and the other plurality of drive electrodes are simultaneously selected, and the directions of the currents flowing through the selected one of the plurality of drive electrodes and the other plurality of drive electrodes are reversed. To be driven.

  In this case, it is preferable that the same number of second drive electrodes as the number of bundled first drive electrodes TL in the display region 2 are arranged in the frame region. For example, when the pair of drive electrodes is a bundle of n pieces, for example, in order to make the magnetic field generated in the display region uniform, a magnetic field is generated around the drive electrode at the extreme end of the display region 2. Therefore, n auxiliary electrodes are required in the frame region, and when the second drive electrode from the end is the center, n-1 auxiliary electrodes are required in the frame region, and three auxiliary electrodes are required from the end. This is because n-2 auxiliary electrodes are required in the frame region when the second drive electrode is the center.

  In FIG. 13, a bundle of three adjacent drive electrodes (hereinafter also referred to as a bundle drive electrode) is paired with a non-selected first drive electrode TL (0) in between, and the first drive electrode TL (0) A case where a magnetic field is generated around the region is shown. At this time, a bundle drive electrode composed of the second drive electrodes TL (dU1) to TL (dU3) arranged in the upper frame region and the first drive electrodes TL (1) to TL (3) arranged in the display region. ) Are simultaneously selected across the first drive electrode TL (0).

  In the magnetic field generation period, a current I11 indicated by an arrow flows through the second drive electrodes TL (dU1) to TL (dU3) from one end portion to the other end portion due to a voltage difference, and a magnetic field is generated. At the same time, the current I12 indicated by the arrow flows through the first drive electrodes TL (1) to TL (3) from the other end toward one end, and a magnetic field is generated. A magnetic field generated by the second drive electrodes TL (dU1) to TL (dU3) and a magnetic field generated by the first drive electrodes TL (1) to TL (3) are in the region of the first drive electrode TL (0). As a result, a strong magnetic field can be generated in the region of the first drive electrode TL (0). As a result, the first drive electrode TL (0) disposed closest to the side 2-U of the display region 2 is the center, and the same magnetic field is generated as the first drive electrode near the center of the display region 2 is the center. A magnetic field with a moderate strength can be generated.

  In the next magnetic field generation period following FIG. 13, the drive electrode that is the center of magnetic field generation is shifted to the next one, and as shown in FIG. 14, the second drive electrode TL (dU2) arranged in the upper frame region. ~ TL (dU3) and the first drive electrode TL (0) arranged in the display area are bundled to form a bundle drive electrode, and the first drive electrodes TL (2) ~ TL ( 4) is a bundle to form a bundle drive electrode. In this magnetic field generation period, an arrow current I11 flows through the second drive electrodes TL (dU2) to TL (dU3) and the first drive electrode TL (0) to generate a magnetic field, and at the same time, the first drive electrode TL ( 2) to TL (4), an arrow current I12 flows to generate a magnetic field. These magnetic fields are superimposed in the region of the first drive electrode TL (1), and a strong magnetic field is applied to the first drive electrode TL. It can be generated in the area (1).

  Thereafter, the drive electrode which is the center of magnetic field generation is sequentially shifted, and during the magnetic field generation period centering on the drive electrode at the lowermost end of the display area 2, it is arranged in the display area as shown in FIG. The first drive electrodes TL (p-3) to TL (p-1) are bundled to form a bundle drive electrode, and the second drive electrodes TL (dD1) to TL (dD3) arranged in the lower frame region are A bundle driving electrode is configured as a bundle. In this magnetic field generation period, a current I11 indicated by an arrow flows through the first drive electrodes TL (p-3) to TL (p-1) to generate a magnetic field, and at the same time, the second drive electrodes TL (dD1) to TL (dD3 ) Causes a current I12 indicated by an arrow to flow, and magnetic fields are generated. These magnetic fields are superimposed in the region of the first drive electrode TL (p), and a strong magnetic field is generated in the region of the first drive electrode TL (p). Can be generated. As a result, the first drive electrode TL (p) disposed closest to the side 2-D of the display area 2 is the center, and the first drive electrode disposed near the center of the display area 2 is the center. It is possible to generate a magnetic field having the same strength as.

  In the second embodiment, the second drive electrodes TL (dU1) to TL (dU3) and (dD1) to TL (dD3) are arranged in the frame region, so that the detection accuracy in the display region 2 (detection region). It is possible to reduce the area where the decrease occurs. Further, in the first embodiment, it is possible to generate a stronger magnetic field than in the first embodiment by driving the three drive electrodes as a bundle.

  Also in the circuit arrangement of the display device 1 in the second embodiment, as in the modification example, the shapes and sizes of the second drive electrodes TL (dU1) to TL (dU3) in the upper frame region are set as shown in FIG. The selection circuits SEL (dU1) to SEL (dU3) and SER (dU1) to SER (dU3) for driving the second drive electrodes TL (dU1) to TL (dU3) and the switches S1L, S2L, S1R and S2R The arrangement of is devised. When compared with the first drive electrodes TL (0) to TL (p), the second drive electrodes TL (dU1) to TL (dU3) have a lateral length (electrode length) when viewed in a plan view. The length) is shortened, and the length in the vertical direction (electrode width) is also shortened. Further, the second drive electrodes TL (dU1) to TL (dU3) have a predetermined shape by cutting out a predetermined rectangular portion when viewed in a plan view. The switches S1L and S2L and the switches S1R and S2R are arranged in the cutout portions of the shapes of the second drive electrodes TL (dU1) to TL (dU3), respectively. In addition, the selection circuits SEL (dU1) to SEL (dU3) and the selection circuit SER () are provided on the left and right portions of the second drive electrodes TL (dU1) to TL (dU3) which are vacated by shortening the lateral length. dU1) to SER (dU3) are arranged.

  That is, the selection circuits SEL (dU1) to SEL (dU3) for driving the second drive electrodes TL (dU1) to TL (dU3), the switches S1L and S2L, the selection circuits SER (dU1) to SER (dU3), the switches S1R and S2Rs are arranged in the horizontal direction in the upper frame region outside the display region 2 with the second drive electrodes TL (dU1) to TL (dU3) interposed therebetween. Thereby, the selection circuit SEL and the switch are not disposed beyond the electrode width of the first drive electrodes TL (dU1) to TL (dU3) in the vertical direction of the upper side frame region, and an increase in the upper side frame region is suppressed. The second drive electrodes TL (dU1) to TL (dU3) are formed of, for example, a low-resistance metal material such as Ti (titanium) or AL (aluminum), so that the first drive electrodes TL (0 ) To TL (p), a strong magnetic field can be generated even if the wiring width is narrower. In addition, it is calculated that the current flows through the signal wirings TPLL and TSVL and the signal wirings TPLR and TSVR themselves to generate a magnetic field, and the second drive electrodes TL (dU1) to TL (dU3) and the signal wirings TPLL and It is designed so that a necessary current value can flow in total of TSVL, signal wirings TPLR and TSVR.

  That is, since the second drive electrodes TL (dU1) to TL (dU3) and the signal wirings TPLR and TSVR are arranged in the horizontal direction in the upper frame region, the signal wirings TPLR and TSVR are also used as auxiliary electrodes for generating a magnetic field. Can function. When the drive electrodes are bundled to generate a magnetic field, if there are no second drive electrodes for the number of bundles (three in this embodiment) on the upper frame, the first to third from the upper side 2-U of the display area 2 When it is desired to generate a magnetic field around the first drive electrodes TL (0) to TL (2), the amount of generated magnetic field is reduced compared to the vicinity of the center of the display area 2, and the detection sensitivity in the display area plane is not uniform. It becomes.

<Electronic device>
FIG. 16 is a perspective view illustrating a configuration of electronic device 100 including display device 1 described in the first and second embodiments. The electronic device 100 includes a tablet computer 101 including the display device 1 and a pen Pen. The pen Pen is an indicator including a coil and a capacitive element as shown in FIG. In FIG. 16, 2 indicates the display area described above, and 102 indicates a frame area arranged so as to surround the display area 2. Reference numeral 103 denotes a button of the computer 101.

  In the display period described above, an image is displayed in the display area 2, and in the magnetic field touch detection period or the like, whether or not the pen Pen is close to the display area 2 and coordinates are detected. The computer 101 performs processing according to the result.

<Effect>
Also in the display device 1 according to the second embodiment, as in the first embodiment, in the case of the in-cell type display device, the display device having the input detection device that suppresses the increase in the upper frame region outside the display region 2. Can be provided. In particular, the second drive electrodes TL (dU1) to TL (dU3), selection circuits SEL (dU1) to SEL (dU3), SER (dU1) to SER (dU3), switch S1L in the upper frame region outside the display region 2 , S2L, S1R, S2R and signal wirings TPLL, TSVL, TPLR, TSVR are devised so that the necessary current flows through the second drive electrodes TL (dU1) to TL (dU3) while maintaining a narrow frame. Can do.

  In the category of the idea of the present invention, those skilled in the art can conceive of various modifications and modifications, and it is understood that these modifications and modifications belong to the scope of the present invention.

  For example, those in which the person skilled in the art appropriately added, deleted, or changed the design of the above-described embodiments, or those in which the process was added, omitted, or changed the conditions are also included in the present invention. As long as the gist is provided, it is included in the scope of the present invention.

  For example, in the above-described embodiment, the first drive electrodes TL (0) to TL (p), the second drive electrodes TL (dU) and TL (dD) extend in the row direction (lateral direction), Although the case where they are arranged in parallel to the column direction (vertical direction) has been described, the row direction and the column direction vary depending on the viewing viewpoint. From a different viewpoint, the first drive electrodes TL (0) to TL (p), the second drive electrodes TL (dU) and TL (dD) extend in the column direction and are arranged in parallel in the row direction. Such a case is also included in the scope of the present invention. In addition, “parallel” used in the present specification means extending without crossing from one end to the other end. Therefore, even if a part or all of one line (or electrode) is provided in an inclined state with respect to the other line (or electrode), these lines must not intersect from one end to the other. In this specification, this state is also assumed to be “parallel”.

DESCRIPTION OF SYMBOLS 1 Display apparatus 3 Control apparatus 5 Touch control apparatus 100 Electronic device DRVL, DRVR 1st drive circuit DRVU, DRVD 2nd drive circuit S1L, S2L, S1R, S2R Switch SEL (0) -SEL (p), SER (0)- SER (p) selection circuit SEL (dU), SER (dU), SEL (dD), SER (dD) selection circuit TL (0) to TL (p) First drive electrode TL (dU), TL (dD) 2 drive electrodes TPLL, TSVL, TPLR, TSVR Signal wirings UDL (0) to UDL (p), UDR (0) to UDR (p) Unit drive circuits UDL (dU), UDR (dU), UDL (dD), UDR (DD) Unit drive circuit

Claims (19)

A plurality of pixel electrodes arranged in the display area;
A plurality of first drive electrodes arranged in the display area;
A second drive electrode disposed in the frame region;
A second drive circuit disposed in the frame region and connected to the second drive electrode;
With
The plurality of first drive electrodes and the second drive electrodes are arranged in a second direction extending in a first direction and intersecting the first direction,
The second driving circuit supplies a magnetic field driving signal to the second driving electrode;
Display device. The display device according to claim 1,
Driving the second drive electrode and at least one first drive electrode simultaneously to generate a magnetic field;
Display device. The display device according to claim 1,
A plurality of first drive circuits electrically connected to the first drive electrodes, respectively;
The second driving circuit and at least one of the first driving circuits simultaneously supply a magnetic field driving signal to the second driving electrode and at least one of the first driving electrodes;
Display device. The display device according to claim 1,
A first wiring and a second wiring;
In the first period, the second drive circuit supplies the first voltage to one end of the second drive electrode via the first wiring, and supplies the second voltage to the other end of the second drive electrode via the second wiring. Supply,
The second voltage is higher than the first voltage;
Display device. The display device according to claim 4,
A plurality of first drive circuits electrically connected to the first drive electrodes, respectively;
At least one of the first drive circuits supplies a first voltage to the other end of the at least one first drive electrode via a first wiring in the first period, and supplies a second voltage to the at least one first drive electrode. Supply to one end of the second via the second wiring,
Display device. The display device according to claim 4,
A plurality of first drive circuits electrically connected to the first drive electrodes, respectively;
At least one of the first drive circuits supplies a first voltage to one end of at least one first drive electrode via a first wiring in a first period, and supplies a second voltage to at least one first drive electrode. Supplying the other end of the first via a second wiring,
Display device. The display device according to claim 4,
A plurality of first drive circuits electrically connected to the first drive electrodes, respectively;
At least one of the first drive circuits supplies a display drive signal to at least one of the first drive electrodes;
Display device. The display device according to claim 4,
A plurality of first drive circuits electrically connected to the first drive electrodes, respectively;
At least one of the first drive circuits supplies an electric field drive signal to at least one of the first drive electrodes;
Display device. A plurality of first drive electrodes arranged in the detection region;
A second drive electrode disposed in the frame region;
A second drive circuit for driving the second drive electrode;
With
The plurality of first drive electrodes and the second drive electrodes are arranged in a second direction extending in a first direction and intersecting the first direction,
The input detection device, wherein the second drive electrode and the second drive circuit are arranged in the first direction in the frame region. The input detection device according to claim 9,
An input detection device that simultaneously drives the second drive electrode and the plurality of first drive electrodes to generate a magnetic field. The input detection device according to claim 9,
The second driving circuit includes:
A second switch for connecting a signal wiring for supplying a driving voltage to the second driving electrode and the second driving electrode;
A second selection circuit that selects the second drive electrode by switching the second switch;
An input detection device. The input detection device according to claim 9,
The input detection device, wherein the second drive electrode is shorter than the first drive electrode in the first direction. The input detection device according to claim 9,
The input detection device, wherein the second drive electrode is shorter than the first drive electrode in the second direction. The input detection device according to claim 9,
A first drive circuit for driving the first drive electrode;
The first drive circuit includes:
A first switch for connecting the first drive electrode and a signal line for supplying a drive voltage to the first drive electrode;
A first selection circuit that switches the first switch to select the first drive electrode;
Including
The input detection device, wherein the first drive circuit and the second drive circuit simultaneously drive the first drive electrode and the second drive electrode to generate a magnetic field. The input detection device according to claim 9,
In the frame region, further has a signal wiring extending in the first direction,
The input detection device, wherein a total amount of current flowing through the signal wiring and the second drive electrode and a current amount flowing through the first drive electrode are equal when a magnetic field is generated. The input detection device according to claim 9,
A plurality of the second drive electrodes are arranged on one side of the frame region. The input detection device according to claim 9,
The input detection device, wherein the plurality of first drive electrodes also function as detection electrodes. The input detection device according to claim 9,
The input detection device, wherein the second drive electrode is formed of a metal material.   An electronic device comprising the input detection device according to claim 9.

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