JP7031037B2 - Display device - Google Patents

Description

The present invention relates to a display device.

In recent years, a touch detection device capable of detecting an external proximity object, which is a so-called touch panel, has attracted attention. The touch panel is mounted or integrated on a display device such as a liquid crystal display device, and is used as a display device with a touch detection function. For example, in the touch screen panel of Patent Document 1, a plurality of detection electrodes are provided in a matrix. In the touch screen panel of Patent Document 1, touch detection of the display area is performed based on the change in the capacitance of the detection electrode. In a display device with a touch detection function, a button having an input function is arranged in the peripheral area of the peripheral portion of the display area. A technique for integrating such an input button into a peripheral area of a touch panel or a display device is known.

U.S. Patent Application Publication No. 2016/202829

However, Patent Document 1 does not describe touch detection in the peripheral region. With the detection electrode provided in the display area, touch detection in the peripheral area may be difficult.

An object of the present invention is to provide a display device having good detection performance in a peripheral region.

The display device according to one aspect of the present invention includes a substrate, a plurality of first electrodes arranged in a matrix in the display region of the substrate, and a plurality of plurality of electrodes arranged in a peripheral region outside the display region of the substrate. The first electrode has a second electrode, a drive unit that supplies a drive signal to the first electrode and the second electrode, and a plurality of wires connected to each of the plurality of the first electrodes. , The first electrode and the second electrode are electrically connected to the drive unit via the wiring, and output a detection signal corresponding to each change in self-electrostatic capacity.

The display device according to one aspect of the present invention is provided on the substrate, a plurality of first electrodes arranged in a matrix in the display region of the substrate, and along at least one side of a peripheral region outside the display region. It has a second electrode, a drive unit that supplies a drive signal to the second electrode, and wiring connected to each of the plurality of first electrodes, and the first electrode has the wiring via the wiring. When the drive signal is electrically connected to the drive unit and the drive signal is supplied to the second electrode, the first electrode outputs a detection signal according to a change in capacitance between the second electrode and the second electrode. ..

FIG. 1 is a block diagram showing a configuration example of a display device according to the first embodiment. FIG. 2 is an explanatory diagram for explaining the basic principle of touch detection of the mutual capacitance method. FIG. 3 is an explanatory diagram showing an example of an equivalent circuit of touch detection of the mutual capacitance method. FIG. 4 is a diagram showing an example of the drive signal of the touch detection of the mutual capacitance method and the waveform of the detection signal. FIG. 5 is an explanatory diagram showing a non-contact state for explaining the basic principle of touch detection of the self-capacitance method. FIG. 6 is an explanatory diagram showing a contact state for explaining the basic principle of touch detection of the self-capacitance method. FIG. 7 is an explanatory diagram showing an example of an equivalent circuit for touch detection of the self-capacitance method. FIG. 8 is a diagram showing an example of the drive signal of the touch detection of the self-capacitance method and the waveform of the detection signal. FIG. 9 is a cross-sectional view showing a schematic cross-sectional structure of the display device according to the first embodiment. FIG. 10 is a circuit diagram showing the pixel arrangement of the display unit. FIG. 11 is a plan view of the first substrate according to the first embodiment. FIG. 12 is a cross-sectional view taken along the line A1-A2 of FIG. FIG. 13 is an explanatory diagram for explaining an operation example of touch detection of the display device according to the first embodiment. FIG. 14 is an explanatory diagram for explaining an operation example of touch detection of the display device according to the first embodiment. FIG. 15 is a schematic diagram showing a connection configuration between a first electrode and an analog front-end circuit of the display device according to the modified example of the first embodiment. FIG. 16 is a circuit diagram showing an example of a connection circuit according to a modification of the first embodiment. FIG. 17 is a circuit diagram showing another example of the connection circuit according to the modified example of the first embodiment. FIG. 18 is a plan view of the first substrate according to the second embodiment. FIG. 19 is an explanatory diagram for explaining an operation example of touch detection of the display device according to the second embodiment. FIG. 20 is an explanatory diagram for explaining an operation example of touch detection of the display device according to the second embodiment. FIG. 21 is an explanatory diagram for explaining an operation example of touch detection of the display device according to the second embodiment. FIG. 22 is a plan view of the first substrate according to the third embodiment. FIG. 23 is an explanatory diagram for explaining an operation example of touch detection of the display device according to the third embodiment. FIG. 24 is an explanatory diagram for explaining an operation example of touch detection of the display device according to the third embodiment. FIG. 25 is an explanatory diagram for explaining an operation example of touch detection of the display device according to the third embodiment. FIG. 26 is a cross-sectional view showing a schematic cross-sectional structure of the display device according to the fourth embodiment. FIG. 27 is a plan view of the first substrate according to the fourth embodiment. FIG. 28 is a plan view of the cover substrate according to the fourth embodiment. FIG. 29 is a plan view of the first substrate according to the fifth embodiment. FIG. 30 is a plan view of the cover substrate according to the fifth embodiment. FIG. 31 is a schematic diagram showing a connection configuration between the first electrode and the analog front-end circuit of the display device according to the sixth embodiment. FIG. 32 is a cross-sectional view taken along the line B1-B2 of FIG. FIG. 33 is a cross-sectional view of the display device according to the modified example of the sixth embodiment. FIG. 34 is a plan view of the first substrate according to the seventh embodiment. FIG. 35 is a plan view of the first substrate according to the first modification of the seventh embodiment. FIG. 36 is a plan view of the first substrate according to the second modification of the seventh embodiment. FIG. 37 is a plan view of the first substrate according to the third modification of the seventh embodiment.

An embodiment (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the components described below can be combined as appropriate. 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, which are naturally included in the scope of the present invention. Further, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual embodiment, but this is just an example, and the interpretation of the present invention is used. It is not limited. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate.

(First Embodiment)
FIG. 1 is a block diagram showing a configuration example of a display device according to the first embodiment. As shown in FIG. 1, the display device 1 includes a display panel 10, a control unit 11, a gate driver 12, a source driver 13, a first electrode driver 14, and a detection unit 40. The display panel 10 includes a display unit 20 for displaying an image and a touch sensor 30 which is a detection device for detecting a touch input.

The display panel 10 is a display device in which the display unit 20 and the touch sensor 30 are integrated. Specifically, in the display panel 10, a part of the members such as the electrode and the substrate of the display unit 20 is also used as the electrode and the substrate of the touch sensor 30.

The display unit 20 uses a liquid crystal display element as a display element. The display unit 20 includes a plurality of pixels having a display element, and has a display surface facing the plurality of pixels. Further, the display unit 20 receives the input of the video signal Vdisk and displays an image composed of a plurality of pixels on the display surface. The display panel 10 may be a device in which the touch sensor 30 is mounted on the display unit 20. Further, the display unit 20 may be, for example, an organic EL display panel.

The control unit 11 supplies a control signal to the gate driver 12, the source driver 13, the first electrode driver 14, and the detection unit 40 based on the video signal Vdisp supplied from the outside. The control unit 11 is a circuit that controls the display operation and the detection operation of the display device 1.

The gate driver 12 supplies the scanning signal Vscan to one horizontal line to be displayed driven by the display panel 10 based on the control signal supplied from the control unit 11. As a result, one horizontal line to be displayed and driven is sequentially or simultaneously selected.

The source driver 13 is a circuit of the display unit 20 that supplies a pixel signal Vpix to each sub-pixel SPix (see FIG. 10). Some of the functions of the source driver 13 may be mounted on the display panel 10. In this case, the control unit 11 may generate a pixel signal Vpix and supply the pixel signal Vpix to the source driver 13.

The first electrode driver 14 is a circuit that supplies a drive signal Vcomdc for display to the first electrode COML (see FIG. 11) of the display panel 10. Further, the first electrode driver 14 supplies a drive signal Vcom for detection to the first electrode COML and the second electrodes 53, 54, 55 (see FIG. 11) at the time of touch detection.

In the present embodiment, the control unit 11 performs a display operation of displaying by the display unit 20 and a detection operation of detecting the object to be detected by the touch sensor 30 in a time-division manner. The first electrode driver 14 supplies the drive signals Vcomdc and Vcom to the first electrode COML and the second electrodes 53, 54 and 55 based on the control signal from the control unit 11.

The touch sensor 30 performs touch detection based on the basic principle of touch detection by the self-capacitance method (also referred to as self-method). When the touch sensor 30 detects the object to be detected in the contact state, the touch sensor 30 outputs the detection signal Vdet2 to the detection unit 40. Further, the touch sensor 30 can also perform touch detection based on the basic principle of touch detection by the mutual capacitance method (also referred to as a mutual method). When the touch sensor 30 detects the object to be detected in the contact state by the mutual capacitance method, the touch sensor 30 outputs the detection signal Vdet1 to the detection unit 40.

As used herein, the term "contact state" refers to a state in which the object to be detected is in contact with the display surface or is in close proximity to the display surface. Further, the "non-contact state" represents a state in which the detected object is not in contact with the display surface or is not so close to the display surface that it can be regarded as contact.

In the mutual capacitance type touch detection, the detection unit 40 covers the display surface of the display panel 10 based on the control signal supplied from the control unit 11 and the detection signal Vdet1 output from the display panel 10. It is a circuit that detects the presence or absence of touch of the detector. Further, in the self-capacitance type touch detection, the detection unit 40 reaches the display surface of the display panel 10 based on the control signal supplied from the control unit 11 and the detection signal Vdet2 output from the display panel 10. Detects the presence or absence of touch of the detected object. The detection unit 40 obtains the coordinates and the like at which the touch input is performed when there is a touch.

The detection unit 40 includes an analog front-end circuit 48, a signal processing unit 44, a coordinate extraction unit 45, and a detection timing control unit 46. The analog front-end circuit 48 (hereinafter referred to as AFE (Analog Front End) 48) includes a detection signal amplification unit 42 and an A / D conversion unit 43. The AFE 48 is an analog signal processing circuit that converts the detection signals Vdet1 and Vdet2 into digital signals and outputs them to the signal processing unit 44. The detection timing control unit 46 controls the A / D conversion unit 43, the signal processing unit 44, and the coordinate extraction unit 45 to operate in synchronization with each other based on the control signal supplied from the control unit 11.

In touch detection, the detection signal amplification unit 42 amplifies the detection signal Vdet1 supplied from the display panel 10. The A / D conversion unit 43 samples the analog signals output from the detection signal amplification unit 42 and converts them into digital signals at the timing synchronized with the drive signal Vcom.

The signal processing unit 44 is a logic circuit that detects the presence or absence of a touch on the display panel 10 based on the output signal of the A / D conversion unit 43. The signal processing unit 44 performs a process of extracting a signal (absolute value | ΔV |) of the difference between the detection signals by the finger. The signal processing unit 44 compares the absolute value | ΔV | with a predetermined threshold voltage, and if the absolute value | ΔV | is less than the threshold voltage, determines that the object to be detected is in a non-contact state. .. On the other hand, if the absolute value | ΔV | is equal to or higher than the threshold voltage, the signal processing unit 44 determines that the object to be detected is in the contact state or the close state. In this way, the detection unit 40 can perform touch detection.

The coordinate extraction unit 45 is a logic circuit that obtains the touch panel coordinates when the touch is detected by the signal processing unit 44. The coordinate extraction unit 45 outputs the touch panel coordinates as an output signal Vout. The coordinate extraction unit 45 may output the output signal Vout to the control unit 11. The control unit 11 can execute a predetermined display operation or detection operation based on the output signal Vout.

The detection signal amplification unit 42, the A / D conversion unit 43, the signal processing unit 44, the coordinate extraction unit 45, and the detection timing control unit 46 of the detection unit 40 are mounted on the display device 1. However, the present invention is not limited to this, and all or part of the functions of the detection unit 40 may be mounted on an external control board, processor, or the like. For example, the coordinate extraction unit 45 may be mounted on an external processor other than the display device 1. In this case, the detection unit 40 may output the signal processed by the signal processing unit 44 as an output signal Vout. Alternatively, the AFE 48 may be mounted on the display device 1, and the signal processing unit 44 and the coordinate extraction unit 45 may be mounted on an external processor. In this case, the detection unit 40 may output the digital signal processed by the A / D conversion unit 43 as the output signal Vout.

Next, with reference to FIGS. 2 to 4, the basic principle of touch detection by the mutual capacitance method of the display device 1 of the present embodiment will be described. FIG. 2 is an explanatory diagram for explaining the basic principle of touch detection of the mutual capacitance method. FIG. 3 is an explanatory diagram showing an example of an equivalent circuit of touch detection of the mutual capacitance method. FIG. 4 is a diagram showing an example of the drive signal of the touch detection of the mutual capacitance method and the waveform of the detection signal. In the following description, the case where the fingers come into contact with each other or come close to each other will be described, but the present invention is not limited to the fingers, and may be, for example, a stylus pen or the like.

As shown in FIG. 2, the capacitive element C1 includes a pair of drive electrodes E1 and detection electrodes E2 arranged so as to face each other with the dielectric D interposed therebetween. The capacitive element C1 has an electric line of force (not shown) formed between the facing surfaces of the drive electrode E1 and the detection electrode E2, and a fringe extending from the end of the drive electrode E1 toward the upper surface of the detection electrode E2. Minute lines of electric force are generated. As shown in FIG. 3, one end of the capacitive element C1 is connected to the AC signal source (drive signal source) S, and the other end is connected to the voltage detector DET. The voltage detector DET is, for example, an integrating circuit included in the detection signal amplification unit 42 shown in FIG.

When an AC rectangular wave Sg having a predetermined frequency (for example, about several kHz to several hundred kHz) is applied from the AC signal source S to the drive electrode E1 (one end of the capacitive element C1), FIG. 4 An output waveform (detection signal Vdet1) as shown in the above appears.

In the non-contact state, a current corresponding to the capacitance value of the capacitance element C1 flows. The voltage detector DET shown in FIG. 3 converts the fluctuation of the current corresponding to the AC square wave Sg into the fluctuation of the voltage (solid line waveform V ₀ (see FIG. 4)).

As shown in FIGS. 2 and 3, in the contact state, the capacitance C2 formed by the finger is in contact with the detection electrode E2 or is close enough to be equated with the contact. As a result, the electric lines of force for the fringes between the drive electrode E1 and the detection electrode E2 are blocked by the conductor (finger). Therefore, the capacitance element C1 acts as a capacitance element having a capacitance value smaller than the capacitance value in the non-contact state. Then, the voltage detector DET converts the fluctuation of the current I ₁ according to the AC square wave Sg into the fluctuation of the voltage (dotted waveform V ₁ (see FIG. 4)).

In this case, the amplitude of the waveform V ₁ is smaller than that of the waveform V ₀ described above. As a result, the absolute value | ΔV | of the voltage difference between the waveform V ₀ and the waveform V ₁ changes according to the influence of an external object that comes into contact with or is close to the outside such as a finger. The voltage detector DET resets the charge / discharge of the capacitor according to the frequency of the AC square wave Sg by switching in the circuit. By providing the Reset for such a period, the absolute value | ΔV | of the voltage difference is detected with high accuracy.

As described above, the detection unit 40 compares the absolute value | ΔV | with the predetermined threshold voltage to determine whether the external close object is in the non-contact state, the contact state, or the close state. In this way, the detection unit 40 can perform touch detection based on the basic principle of mutual capacitance type touch detection.

Next, the basic principle of the self-capacitance type touch detection will be described with reference to FIGS. 5 to 8. FIG. 5 is an explanatory diagram showing a non-contact state for explaining the basic principle of touch detection of the self-capacitance method. FIG. 6 is an explanatory diagram showing a contact state for explaining the basic principle of touch detection of the self-capacitance method. FIG. 7 is an explanatory diagram showing an example of an equivalent circuit for touch detection of the self-capacitance method. FIG. 8 is a diagram showing an example of the drive signal of the touch detection of the self-capacitance method and the waveform of the detection signal.

The left figure of FIG. 5 shows a state in which the power supply Vdd and the detection electrode E3 are connected by the switch SW1 and the detection electrode E3 is not connected to the capacitor Ccr by the switch SW2 in the non-contact state. In this state, the capacitance Cx1 of the detection electrode E3 is charged. The right figure of FIG. 5 shows a state in which the power supply Vdd and the detection electrode E3 are not connected by the switch SW1, and the detection electrode E3 and the capacitor Ccr are connected by the switch SW2. In this state, the charge of the capacitance Cx1 is discharged via the capacitor Ccr.

The left figure of FIG. 6 shows a state in which the power supply Vdd and the detection electrode E3 are connected by the switch SW1 and the detection electrode E3 is not connected to the capacitor Ccr by the switch SW2 in the contact state. In this state, in addition to the capacity Cx1 possessed by the detection electrode E3, the capacity Cx2 generated by the finger in the vicinity of the detection electrode E3 is also charged. The right figure of FIG. 6 shows a state in which the power supply Vdd and the detection electrode E3 are not connected by the switch SW1, and the detection electrode E3 and the capacitor Ccr are connected by the switch SW2. In this state, the charge of the capacitance Cx1 and the charge of the capacitance Cx2 are discharged via the capacitor Ccr.

Here, the voltage change characteristic of the capacitor Ccr at the time of discharge (non-contact state) shown in the right figure of FIG. 5 is the voltage change characteristic of the capacitor Ccr at the time of discharge (contact state) shown in the right figure of FIG. Is clearly different because of the existence of. Therefore, in the self-capacitance method, the presence / absence of an operation input such as a finger is determined by utilizing the fact that the voltage change characteristic of the capacitor Ccr differs depending on the presence / absence of the capacitance Cx2.

Specifically, an AC square wave Sg (see FIG. 8) having a predetermined frequency (for example, about several kHz to several hundred kHz) is applied to the detection electrode E3. The voltage detector DET shown in FIG. ₇ converts the fluctuation of the current corresponding to the AC square wave Sg into the fluctuation of the voltage ₍ waveforms V4 and V5).

In FIG. ₈ , at the timing of time _T01 , the AC rectangular wave Sg rises to a voltage level corresponding to the voltage V6. At this time, since the switch SW1 is turned on and the switch SW2 is turned off, the potential of the detection electrode E3 also rises to the voltage _V6 . Next, the switch SW1 is turned off before the timing of the time _T11 . At this time, the detection electrode E3 is in a floating state, but the potential of the detection electrode E3 is maintained at a voltage V6 due to the capacitance Cx1 (or Cx1 + Cx2, see FIG. ₆ ) of the detection electrode E3. Further, the voltage detector DET reset operation is performed before the timing of time _T11 .

Subsequently, when the switch SW2 is turned _on at the timing of time T11, the charge accumulated in the capacitance Cx1 (or Cx1 + Cx2) of the detection electrode E3 moves to the capacitance C5 in the voltage detector DET, so that the voltage detector DET The output of is increased (see the detection signal Vdet2 in FIG. 8). The output of the voltage detector DET (detection signal Vdet2) becomes the waveform V4 shown by the solid line in the non _- contact state, and Vdet2 = Cx1 × _V6 / C5. _In the contact state, the waveform is V5 shown by the dotted line, and Vdet2 = (Cx1 + _Cx2 ) × V6 / C5.

After that, by turning off the switch SW2 at the timing of time _T31 and turning on the switch SW1 and the switch SW3, the potential of the detection electrode E3 is set to the same low level as the AC square wave Sg, and the voltage detector DET is reset. Let me. The above operation is repeated at a predetermined frequency (for example, about several kHz to several hundred kHz). In this way, the detection unit 40 can perform touch detection based on the basic principle of self-capacitance type touch detection.

Next, a configuration example of the display device 1 of the present embodiment will be described in detail. FIG. 9 is a cross-sectional view showing a schematic cross-sectional structure of the display panel according to the first embodiment. As shown in FIG. 9, the display device 1 includes a pixel substrate 2, a facing substrate 3, and a liquid crystal layer 6 as a display function layer. The facing substrate 3 is arranged so as to face the surface of the pixel substrate 2 in a direction perpendicular to the surface. Further, the liquid crystal layer 6 is provided between the pixel substrate 2 and the facing substrate 3.

The pixel substrate 2 has a first substrate 21, a pixel electrode 22, a first electrode COML, a second electrode 53, and a polarizing plate 35B. On the first substrate 21, a circuit such as a gate scanner included in the gate driver 12, a switching element such as a TFT (Thin Film Transistor), and various wirings such as a gate line GCL and a signal line SGL (omitted in FIG. 9). Shown) is provided.

The first electrode COML is provided on the upper side of the first substrate 21. The pixel electrode 22 is provided on the upper side of the first electrode COML via the insulating layer 24. The pixel electrode 22 is provided on a layer different from that of the first electrode COML, and is arranged so as to overlap the first electrode COML in a plan view. The second electrode 53 is provided on the same layer as the pixel electrode 22, and is provided on the outer peripheral side of the first substrate 21 with respect to the pixel electrode 22. Further, a plurality of pixel electrodes 22 are arranged in a matrix in a plan view. The polarizing plate 35B is provided on the lower side of the first substrate 21. In this embodiment, an example in which the pixel electrode 22 is provided on the upper side of the first electrode COML has been described, but the present invention is not limited to this. The first electrode COML may be provided on the upper side of the pixel electrode 22. That is, the pixel electrode 22 and the first electrode COML are provided so as to be separated from each other in the direction perpendicular to the surface of the first substrate 21 with the insulating layer 24 interposed therebetween, and one of them is above the other.

In the present specification, the direction from the first substrate 21 to the second substrate 31 in the direction perpendicular to the surface of the first substrate 21 is referred to as "upper side". Further, the direction from the second substrate 31 toward the first substrate 21 is defined as the "lower side". Further, the “planar view” indicates a case where the first substrate 21 is viewed from a direction perpendicular to the surface of the first substrate 21.

The pixel electrode 22 is provided corresponding to the sub-pixel SPix constituting each pixel Pix of the display panel 10. The pixel signal Vpix for performing the display operation is supplied to the pixel electrode 22 from the source driver 13 (see FIG. 1). Further, during the display operation, a display drive signal Vcomdc, which is a DC voltage signal, is supplied to the first electrode COML. As a result, the first electrode COML functions as a common electrode for the plurality of pixel electrodes 22. Further, the first electrode COML functions as a detection electrode in touch detection.

In the present embodiment, the pixel electrode 22, the first electrode COML, and the second electrodes 53, 54, 55 (only the second electrode 53 is shown in FIG. 9) have translucency such as ITO (Indium Tin Oxide). A conductive material is used.

The facing substrate 3 has a second substrate 31, a color filter 32 formed on one surface of the second substrate 31, and a polarizing plate 35A provided on the other surface of the second substrate 31. The color filter 32 faces the liquid crystal layer 6 in the direction perpendicular to the first substrate 21. The color filter 32 may be arranged on the first substrate 21. In the present embodiment, the first substrate 21 and the second substrate 31 are, for example, a glass substrate or a resin substrate.

The first substrate 21 and the second substrate 31 are arranged so as to face each other with a predetermined interval. A liquid crystal layer 6 is provided between the first substrate 21 and the second substrate 31. The liquid crystal layer 6 modulates the passing light according to the state of the electric field. As the liquid crystal layer 6, for example, a liquid crystal in a horizontal electric field mode such as IPS (In-Plane Switching) including FFS (Fringe Field Switching) is used. An alignment film (omitted in FIG. 9) is disposed between the liquid crystal layer 6 and the pixel substrate 2 shown in FIG. 9 and between the liquid crystal layer 6 and the facing substrate 3, respectively.

An illumination unit (backlight) (not shown) is provided on the lower side of the first substrate 21. The lighting unit has a light source such as an LED, and emits light from the light source toward the first substrate 21. The light from the illumination unit passes through the pixel substrate 2 and is modulated by the state of the liquid crystal at that position, and the transmission state to the display surface changes depending on the location. As a result, the image is displayed on the display surface.

Next, the display operation of the display panel 10 will be described. FIG. 10 is a circuit diagram showing the pixel arrangement of the display unit according to the embodiment. A switching element Tr, a signal line SGL, a gate line GCL, and the like of each sub-pixel SPix shown in FIG. 10 are formed on the first substrate 21 (see FIG. 9). The signal line SGL and the gate line GCL are electrically connected to the switching element Tr. The switching element Tr is provided at the intersection of the signal line SGL and the gate line GCL. The signal line SGL is wiring for supplying the pixel signal Vpix to each pixel electrode 22. The gate line GCL is a wiring for supplying a drive signal for driving each switching element Tr. The signal line SGL and the gate line GCL extend in a plane parallel to the surface of the first substrate 21.

The display unit 20 shown in FIG. 10 has a plurality of sub-pixel SPix arranged in a matrix. The sub-pixel SPix includes a switching element Tr and a liquid crystal element 6a, respectively. The switching element Tr is composed of a thin film transistor, and in this example, it is composed of an n-channel MOS (Metal Oxide Semiconductor) type TFT. An insulating layer 24 is provided between the pixel electrode 22 and the first electrode COML, and the holding capacity 6b shown in FIG. 10 is formed by these layers.

The gate driver 12 shown in FIG. 1 sequentially selects the gate line GCL. The gate driver 12 applies the scanning signal Vscan to the gate of the switching element Tr of the sub-pixel SPix via the selected gate line GCL. As a result, one line (one horizontal line) of the sub-pixel SPix is sequentially selected as the display drive target. Further, the source driver 13 supplies the pixel signal Vpix to the selected sub-pixel SPix via the signal line SGL. Then, in these sub-pixel SPix, the display is performed one horizontal line at a time according to the supplied pixel signal Vpix.

When performing this display operation, the first electrode driver 14 shown in FIG. 1 applies a display drive signal Vcomdc to the first electrode COML. The drive signal Vcomdc for display is a voltage signal that serves as a common potential for a plurality of sub-pixel SPix. As a result, each first electrode COML functions as a common electrode with respect to the pixel electrode 22 in the display operation. At the time of display, the first electrode driver 14 applies the drive signal Vcomdc to all the first electrode COMLs in the display area Ad (see FIG. 11).

In the color filter 32 shown in FIG. 9, for example, the color regions of the color filter 32 colored in three colors of red (R), green (G), and blue (B) may be periodically arranged. Each sub-pixel SPix shown in FIG. 10 described above is associated with the color regions 32R, 32G, and 32B of the three colors R, G, and B as a set. Then, the pixel Pix is configured with the sub-pixel SPix corresponding to the three color regions 32R, 32G, and 32B as one set. The color filter 32 may include a color region of four or more colors.

Next, the configuration of the first electrode COML and the second electrodes 53, 54, 55 and the touch detection operation will be described. FIG. 11 is a plan view of the first substrate according to the first embodiment. As shown in FIG. 11, in the display device 1, a display area Ad and a peripheral area Gd are provided. In the present specification, the display area Ad is an area for displaying an image, and is an area that overlaps with a plurality of pixel Pix (sub-pixel SPix). The peripheral region Gd indicates a region inside the outer periphery of the first substrate 21 and outside the display region Ad. The peripheral area Gd may have a frame shape surrounding the display area Ad, and in that case, the peripheral area Gd can be said to be a frame area.

In the present embodiment, a plurality of first electrode COMLs are arranged in a matrix in the display area Ad of the first substrate 21. In other words, a plurality of first electrode COMLs are arranged in the first direction Dx and a plurality of first electrodes Dy. The first electrode COML is arranged in the entire region of the display region Ad. Wiring 27 is connected to each of the first electrodes COML. In the example shown in FIG. 11, the wiring 27 is connected to the first electrode COML in a one-to-one relationship. A plurality of wirings 27 extend in the second direction Dy and are arranged at intervals in the first direction Dx. The first electrode COML is connected to the driver IC 19 via the wiring 27, respectively.

In the present embodiment, the first direction Dx is a direction along one side of the display area Ad. The second direction Dy is a direction orthogonal to the first direction Dx. Not limited to this, the second direction Dy may intersect the first direction Dx at an angle other than 90 °. The plane defined by the first direction Dx and the second direction Dy is parallel to the surface of the first substrate 21. The direction orthogonal to the first direction Dx and the second direction Dy is the thickness direction of the first substrate 21 (see FIG. 9).

A plurality of the second electrodes 53, 54, 55 are arranged in the peripheral region Gd outside the display region Ad. The second electrodes 53, 54, and 55 are provided at positions that do not overlap with the first electrode COML in a plan view. The second electrode 53 is provided in the peripheral region Gd along the second direction Dy, and a plurality of the second electrodes 53 are arranged in the second direction Dy. The second electrode 53 has a rectangular shape having a length in the second direction Dy. In the present embodiment, the arrangement pitch of the second direction Dy of the second electrode 53 is equal to the arrangement pitch of the second direction Dy of the first electrode COML. That is, the second electrode 53 is arranged adjacent to the first electrode COML and the first direction Dx, respectively. The length of the second direction Dy of the second electrode 53 is substantially equal to the length of the second direction Dy of the first electrode COML, and the distance between the second electrodes 53 is the second direction between the first electrode COMLs. Substantially equal to the Dy interval. The length of the first direction Dx of the second electrode 53 is shorter than the length of the first direction Dx of the first electrode COML.

A plurality of second electrodes 54 are provided in the peripheral region Gd along the first direction Dx, and a plurality of the second electrodes 54 are arranged in the first direction Dx. The second electrode 54 has a rectangular shape having a length in the first direction Dx. In the present embodiment, the arrangement pitch of the second electrode 54 is equal to the arrangement pitch of the first direction Dx of the first electrode COML. The second electrode 54 is arranged adjacent to the first electrode COML in the second direction Dy, respectively. The length of the first direction Dx of the second electrode 54 is substantially equal to the length of the first direction Dx of the first electrode COML, and the distance between the second electrodes 54 is the first direction of the first electrode COML. Substantially equal to the Dx interval. The length of the second electrode 54 in the second direction Dy is shorter than the length of the second electrode COML in the second direction Dy. That is, the arrangement pitch of the second electrodes 53 and 54 is equal to the arrangement pitch of the first electrode COML in the direction along one side of the peripheral region Gd.

The second electrode 55 is provided at a corner of the peripheral region Gd. The second electrode 55 is arranged adjacent to the end of the second electrode 53 in the second direction Dy, and is arranged adjacent to the end of the second electrode 54 in the first direction Dx. In this way, the second electrodes 53, 54, 55 are provided on the four sides of the peripheral region Gd surrounding the plurality of first electrodes COML, and are arranged in a frame shape as a whole. Not limited to this, a plurality of second electrodes 53 and 54 may be provided along at least one side of the peripheral region Gd.

As shown in FIG. 11, the flexible substrate 72 is provided in the peripheral region Gd of the first substrate 21. A driver IC 19 is provided in the peripheral region Gd between the first electrode COML and the flexible substrate 72.

The second electrode 53 is connected to the driver IC 19 via the wiring 28A, respectively. The second electrode 54 is connected to the driver IC 19 via the wiring 28B, respectively. Further, the second electrode 55 is connected to the driver IC 19 via the wiring 28C.

The wiring 27 is provided in a different layer via an insulating layer (not shown) from the first electrode COML, and is provided so as to overlap the first electrode COML in a plan view. Further, the wirings 28A, 28B and 28C are provided in different layers via the second electrodes 53, 54 and 55 and an insulating layer (not shown). The wirings 28A and 28C overlap with the second electrodes 53 and 55 and extend in the second direction Dy. The wiring 28B connected to the second electrode 54 on the opposite side of the driver IC 19 with respect to the display area Ad overlaps with the first electrode COML and extends in the second direction Dy.

The driver IC 19 functions as the control unit 11 shown in FIG. Further, the first electrode driver 14 shown in FIG. 1 is included in the driver IC 19. Further, a part of the function of the detection unit 40 may be included in the driver IC 19, or may be provided as a function of an external MPU (Micro-Processing Unit). For example, AFE48 is included in the driver IC19. Not limited to this, the first electrode driver 14 may be provided on the first substrate 21 or may be provided on an external control board. The driver IC 19 is not limited to this, and may be provided on a control board outside the module, for example. In addition to the driver IC 19, another touch IC 18 (see FIG. 15) may be provided, and the touch IC 18 may be equipped with AFE48 or the like.

As an example of the operation method of the display device 1, the display device 1 performs a touch detection operation (touch detection period) and a display operation (display period) in a time-division manner. The touch detection operation and the display operation may be performed separately.

In the display operation, the first electrode driver 14 (see FIG. 1) included in the driver IC 19 supplies a drive signal Vcomdc for display to all the first electrode COMLs. Further, in the touch detection of the self-capacitance method, the first electrode driver 14 supplies the drive signal Vcom to the first electrode COMM simultaneously or in a time-division manner. The first electrode COML outputs a sensor output signal corresponding to each change in the capacitance of the first electrode COML to the AFE48. Touch detection of the display area Ad is performed based on the sensor output signal from each first electrode COML. That is, the first electrode COML functions as a common electrode during the display operation and also functions as a detection electrode during touch detection by the self-capacitance method.

In the display operation, the first electrode driver 14 (see FIG. 1) included in the driver IC 19 supplies a voltage signal having the same potential as the display drive signal Vcomdc to all the second electrodes 53, 54, 55. do. As a result, the second electrodes 53, 54, and 55 function as shield electrodes during display.

Further, in the self-capacitance type touch detection, the first electrode driver 14 supplies the drive signal Vcom to the second electrodes 53, 54, 55 simultaneously or in a time-division manner. The second electrodes 53, 54, 55 output sensor output signals corresponding to the respective capacitance changes of the second electrodes 53, 54, 55 to the AFE48. Touch detection of the peripheral region Gd is performed based on the sensor output signals from the second electrodes 53, 54, 55. That is, the second electrodes 53, 54, and 55 are used as detection electrodes of the self-capacitance method.

In this way, when the second electrodes 53, 54, 55 are provided, the distance between the detected body that is in contact with or close to the peripheral region Gd and the second electrodes 53, 54, 55 is the distance between the detected body and the first electrode. It is smaller than the distance to COML. Therefore, the change in the capacitance of the second electrodes 53, 54, 55 due to the object to be detected in the peripheral region Gd becomes large, and the detection sensitivity of the peripheral region Gd is improved. Therefore, the display device 1 of the present embodiment has good peripheral region Gd detection performance.

FIG. 12 is a cross-sectional view taken along the line A1-A2 of FIG. As shown in FIG. 12, in the display area Ad, a plurality of wirings 27 are provided on the upper side of the first substrate 21 via the insulating layer 25a and the flattening layer 25b. The first electrode COML is provided on the upper side of the plurality of wirings 27 via the insulating layer 25c. The pixel electrode 22 is provided on the upper side of the first electrode COML via the insulating layer 24. Of the plurality of wirings 27 overlapping the first electrode COML, one wiring 27 is connected to the first electrode COML via the contact hole H1.

In the peripheral region Gd, the second electrode 53 is provided on the insulating layer 24, that is, in the same layer as the pixel electrode 22, and is provided in a layer different from the first electrode COML. In addition, another second electrode 53 (not shown in FIG. 12) is also provided in the same layer. That is, the other second electrode 53 is also provided in the same layer as the pixel electrode 22. The plurality of wirings 28A and 28C are provided in the same layer as the plurality of wirings 27. Of the plurality of wirings 28A, one wiring 28A is connected to the second electrode 53 via the contact hole H2. Further, wirings 12a and 12b are provided between the second electrode 56 and the first substrate 21 in a direction perpendicular to the surface of the first substrate 21. The wirings 12a and 12b are wirings included in a circuit such as a gate scanner included in the gate driver 12 (see FIG. 1).

In the second electrode 53 of the present embodiment, a guard ring provided for enhancing the reliability of the display operation can also be used as a drive electrode for touch detection. During the display operation, the first electrode driver 14 supplies a DC voltage signal having the same potential as the drive signal Vcomdc to the plurality of second electrodes 53. As a result, the second electrode 53 can shield the noise of various circuits including the wirings 12a and 12b to improve the display reliability.

13 and 14 are explanatory views for explaining an operation example of touch detection of the display device according to the first embodiment. In touch detection, the first electrode COML and the second electrodes 53, 54, 55 may be driven in any way. 13 and 14 show an example in which detection is performed in a time-division manner for each detection electrode block BK.

As shown in FIG. 13, the first electrode driver 14 (omitted in FIG. 13) included in the driver IC 19 selects the detection electrode block BK1. The detection electrode block BK1 includes a second electrode 54 and a second electrode 55 arranged in the first direction Dx, and a first electrode COML and a second electrode 53 arranged in the first direction Dx. The first electrode driver 14 simultaneously supplies the drive signal Vcom to the first electrode COML and the second electrodes 53, 54, 55 included in the detection electrode block BK1. The first electrode COML and the second electrodes 53, 54, 55 included in the detection electrode block BK1 output sensor output signals corresponding to their respective changes in self-capacitance to AFE48 (see FIG. 1). As a result, touch detection is performed in the display region Ad and the peripheral region Gd of the portion overlapping the detection electrode block BK1.

Next, as shown in FIG. 14, the first electrode driver 14 (omitted in FIG. 14) selects the detection electrode block BK2 in a period different from the period in which the detection electrode block BK1 is selected. The detection electrode block BK2 includes a first electrode COML and a second electrode 53 arranged in the first direction Dx, and a first electrode COML and a second electrode 53 adjacent to each other in the second direction Dy. The first electrode driver 14 simultaneously supplies a drive signal Vcom to the first electrode COML and the second electrode 53 included in the detection electrode block BK2. The first electrode COML and the second electrode 53 included in the detection electrode block BK2 output a sensor output signal corresponding to each change in capacitance to the AFE 48. As a result, touch detection is performed in the display region Ad and the peripheral region Gd of the portion overlapping the detection electrode block BK2.

Then, the first electrode driver 14 sequentially scans the detection electrode block BK including the first electrode COML for two lines and the second electrodes 53, 54, 55. As a result, touch detection of one detection surface is performed. The first electrode driver 14 supplies guard signals to the first electrode COML and the second electrodes 53, 54, 55 other than the detection electrode block BK. The guard signal is a voltage signal having the same potential synchronized with the drive signal Vcom. As a result, the detection electrode block BK and the non-selective first electrode COML and second electrodes 53, 54, 55 other than the detection electrode block BK are driven at the same potential. Therefore, the parasitic capacitance of the detection electrode block BK can be suppressed.

As described above, in the present embodiment, the first electrode COML and the second electrodes 53, 54, 55 have a plurality of detection electrode blocks BK including a predetermined number of the first electrode COML and the second electrodes 53, 54, 55. Configure. The first electrode driver 14 supplies the drive signal Vcom to the plurality of detection electrode blocks BK in a time-division manner. Then, the first electrode COML and the second electrodes 53, 54, 55 of the detection electrode block BK can be simultaneously driven to simultaneously execute the touch detection of the display region Ad and the touch detection of the peripheral region Gd.

Further, since the detection is performed for each detection electrode block BK, the electrodes connected to the AFE48 (see FIG. 1) are simultaneously connected as compared with the case where the first electrode COML and the second electrodes 53, 54, 55 are all driven at the same time. The number of can be reduced. Therefore, the number of terminals of the driver IC 19 on which the AFE 48 is mounted can be reduced.

The operation examples shown in FIGS. 13 and 14 are merely examples, and other driving methods may be used. For example, the first electrode driver 14 may select the first electrode COML for one line and the second electrodes 53, 54, 55 as the detection electrode block BK. Alternatively, the first electrode driver 14 may select the first electrode COML for three lines or more and the second electrodes 53, 54, 55 as the detection electrode block BK. The number of electrodes driven at the same time can be appropriately changed according to the number of channels of the AFE48.

(Variation example of the first embodiment)
In the first embodiment, for example, as shown in FIG. 11, an example in which one driver IC 19 is provided in the peripheral region Gd of the first substrate 21 has been described, but the present invention is not limited thereto. FIG. 15 is a schematic diagram showing a connection configuration between a first electrode and an analog front-end circuit of the display device according to the modified example of the first embodiment.

As shown in FIG. 11, in the display device 1A of the present embodiment, the COF (Chip on Film) 75 is connected to the first substrate 21. The flexible substrate 72 is connected to the opposite side of the first substrate 21 with respect to the COF 75. The COF 75 includes a film-like base material 74 and a driver IC 19. The driver IC 19 is mounted on the base material 74. Further, the touch IC 18 is mounted on the flexible substrate 72. The touch IC 18 includes AFE48.

The driver IC 19 mainly controls the display operation. Further, the touch IC 18 mainly controls touch detection. That is, the driver IC 19 supplies the drive signal Vcomdc for display to the first electrode COML. The touch IC 18 supplies a drive signal Vcom for detection to the first electrode COML and the second electrodes 53, 54, 55.

A connection circuit 17 is provided between the first electrode COML and the COF 75 in the peripheral region Gd of the first substrate 21. The connection circuit 17 is a connection switching circuit that switches between connection and disconnection between the first electrode COML and AFE48, and for example, a multiplexer can be adopted. Each of the first electrodes COML is connected to the connection circuit 17 via the wiring 27. Further, the second electrodes 53, 54, and 55 are connected to the connection circuit 17 via the wirings 28A, 28B, and 28C, respectively. The connection circuit 17 is connected to the AFE 48 via the wiring L11. The wiring L11 is provided over the first substrate 21, the base material 74, and the flexible substrate 72, and is provided at a position that does not overlap with the driver IC 19. The connection circuit 17 bundles and connects a plurality of wirings 27 and a plurality of wirings 28A, 28B, 28C to one wiring L11. Therefore, the number of wirings L11 provided on the base material 74 and the flexible substrate 72 can be reduced as compared with the number of wirings 27 and the plurality of wirings 28A, 28B, 28C.

By providing the connection circuit 17 in this way, the number of terminals of the AFE48 and the touch IC 18 can be reduced as compared with the configuration in which the wiring 27 and the wirings 28A, 28B, and 28C are all connected to the AFE48 and the touch IC 18. Therefore, the configuration of the touch IC 18 can be simplified and the chip size can be reduced.

FIG. 16 is a circuit diagram showing an example of a connection circuit according to a modification of the first embodiment. In FIG. 16, the second electrodes 53, 54, 55, wiring 28A, 28B, 28C, COF75, driver IC19, touch IC18, etc. are omitted. As shown in FIG. 16, for example, the first electrodes COML (11), COML (12), COML (13), and COML (14) are arranged in the second direction Dy. The first electrode COML (11), COML (12), COML (13), and COML (14) are arranged in the order of approaching AFE48. Further, the first electrodes COML (12), COML (22), COML (32), and COML (42) are arranged in this order in the first direction Dx. In the following description, it is necessary to distinguish and explain the first electrodes COML (11), COML (12), COML (13), COML (14), COML (22), COML (32), and COML (42). If not, it is expressed as the first electrode COML.

The connection circuit 17 includes switches SW11, SW12, SW13, SW14 and wiring L12. The switches SW11, SW12, SW13, and SW14 are provided corresponding to a plurality of first electrodes COML (11), COML (12), COML (13), and COML (14) arranged in the second direction Dy. The switches SW11, SW12, SW13, and SW14 are connected to one wiring L11 via a common wiring L12. The switches SW11, SW12, SW13, SW14 and the wiring L12 are provided for each first electrode COML arranged in the first direction Dx.

The operation of the switches SW11, SW12, SW13, and SW14 is controlled based on the control signal from the driver IC19 (see FIG. 15). In the example shown in FIG. 16, the switch SW12 is turned on, and the switches SW11, SW13, and SW14 are turned off. The first electrodes COML (12), COML (22), COML (32), and COML (42) arranged in the first direction Dx are connected to AFE48 via wiring L11, respectively. As a result, the detection electrode block Rx is selected. By operating the switch SW14 from the switch SW11 based on the control signal from the driver IC 19, the detection electrode block Rx is sequentially selected.

By providing the connection circuit 17 in this way, the number of wirings L11 connected to the AFE48 becomes equal to the number of first electrode COML included in one detection electrode block Rx. That is, the number of wirings L11 can be made smaller than the number of wirings 27 connected to the first electrode COML.

The configuration of the connection circuit 17 shown in FIG. 16 is merely an example, and is not limited thereto. FIG. 17 is a circuit diagram showing another example of the connection circuit according to the modified example of the first embodiment. The connection circuit 17a shown in FIG. 17 includes switches SW11, SW12, SW13, SW14 and wirings L13, L14, L15, L16.

The plurality of switches SW11 are connected to the AFE48 via the common wiring L13. The plurality of switches SW12 are connected to the AFE48 via the common wiring L14. The plurality of switches SW13 are connected to the AFE48 via the common wiring L15. The plurality of switches SW14 are connected to the AFE48 via the common wiring L16.

In the example shown in FIG. 17, switches SW11, SW12, SW13, and SW14 connected to the first electrodes COML (21), COML (22), COML (23), and COML (24) arranged in the second direction Dy, respectively. Is turned on. As a result, the first electrodes COML (21), COML (22), COML (23), and COML (24) arranged in the second direction Dy are connected to AFE48 via the wirings L13, L14, L15, and L16, respectively. Will be done. As a result, the detection electrode block Rx is selected. Based on the control signal from the driver IC 19, the switch SW14 operates from the switch SW11 for each of the first electrode COMLs arranged in the second direction Dy, so that the detection electrode block Rx is sequentially selected along the first direction Dx. Will be done.

In the configuration of the connection circuit 17a shown in FIG. 17, the arrangement direction of the first electrode COML included in the detection electrode block Rx can be different from that in FIG. Further, also in the example shown in FIG. 17, the number of the wirings L11 connected to the AFE48 is equal to the number of the first electrode COML included in one detection electrode block Rx. The number of wirings L11 can be made smaller than the number of wirings 27 connected to the first electrode COML, respectively. Compared to the connection circuit 17a shown in FIG. 17, the connection circuit 17 shown in FIG. 16 is not provided with the wirings L13, L14, L15, and L16, and is therefore advantageous for narrowing the frame.

(Second embodiment)
FIG. 18 is a plan view of the first substrate according to the second embodiment. In the display device 1B of the present embodiment, two second electrodes 53A and 53B and two second electrodes 54A and 54B are provided in the peripheral region Gd. The second electrodes 53A and 53B have a long shape having a length in the second direction Dy. The second electrodes 54A and 54B have a long shape having a length in the first direction Dx.

The second electrode 53A is provided on one of the long sides of the peripheral region Gd, and the second electrode 53B is provided on the other side of the long side of the peripheral region Gd. The first electrode COML is arranged between the two second electrodes 53A and 53B. The second electrodes 53A and 53B are provided adjacent to a plurality of first electrodes COML arranged in the second direction Dy. The length of the second direction Dy of the second electrodes 53A and 53B is preferably as long as or longer than the length of the second direction Dy of the display region Ad. The length of the second direction Dy of the second electrodes 53A and 53B may be shorter than the length of the second direction Dy of the display area Ad. The second electrodes 53A and 53B are connected to the driver IC 19 via the wiring 28A, respectively.

The second electrode 54A is provided on one of the short sides of the peripheral region Gd, and the second electrode 54B is provided on the other side of the short side of the peripheral region Gd. The second electrode 54A is provided in the peripheral region Gd at a position farther from the driver IC 19 than the display region Ad. The second electrode 54B is provided in the peripheral region Gd at a position closer to the driver IC 19 than the display region Ad.

The first electrode COML is arranged between the two second electrodes 54A and 54B. The second electrodes 54A and 54B are provided adjacent to a plurality of first electrodes COML arranged in the first direction Dx. The length of the first direction Dx of the second electrodes 54A and 54B is preferably as long as or longer than the length of the first direction Dx of the display region Ad. The length of the first direction Dx of the second electrodes 54A and 54B may be shorter than the length of the first direction Dx of the display region Ad. The second electrodes 54A and 54B are connected to the driver IC 19 via the wiring 28B, respectively.

With such a configuration, the second electrodes 53A and 53B and the second electrodes 54A and 54B form a capacitance between the second electrodes 53A and 53B and the adjacent first electrodes COML. The second electrodes 53A and 53B and the second electrodes 54A and 54B surround the plurality of first electrodes COML and are provided on each of the four sides of the peripheral region Gd. That is, the second electrodes 53A and 53B and the second electrodes 54A and 54B are provided in a frame shape as a whole. Not limited to this, at least one of the second electrodes 53A and 53B and the second electrodes 54A and 54B may be provided along at least one side of the peripheral region Gd. Further, it is preferable that the second electrodes 53A and 53B and the second electrodes 54A and 54B are continuously connected without being electrically separated within a range along at least one side of the display region Ad, respectively.

In the second embodiment, in the touch detection of the display area Ad, the touch detection of the self-capacitance method described in the first embodiment causes the display area Ad based on the change in the capacitance of each first electrode COML. Detects the object to be detected. On the other hand, in the peripheral region Gd, the object to be detected in the peripheral region Gd is detected by the touch detection of the mutual capacitance method. Details are shown below.

19, 20 and 21 are explanatory views for explaining an operation example of touch detection of the display device according to the second embodiment. The display device 1B of the present embodiment performs touch detection of the peripheral region Gd based on the change in capacitance between the second electrodes 53A, 53B, 54A, 54B and the first electrode COML. Specifically, as shown in FIG. 19, the first electrode driver 14 supplies the drive signal Vcom to the second electrode 54A and the second electrode 54B.

The control unit 11 (see FIG. 1) selects a plurality of first electrode COMLs adjacent to the second electrode 54A as detection targets among the first electrode COMLs. Here, a plurality of first electrode COMLs arranged adjacent to the second electrode 54A in the first direction Dx are referred to as a detection electrode block Rx1. That is, the first electrode COML of the detection electrode block Rx1 is arranged adjacent to the second electrode 54A along the longitudinal direction of the second electrode 54A. Further, the control unit 11 (see FIG. 1) selects a plurality of first electrode COMLs adjacent to the second electrode 54B as detection targets among the first electrode COMLs. Here, a plurality of first electrode COMLs arranged adjacent to the second electrode 54B in the first direction Dx are referred to as a detection electrode block Rx2. That is, the first electrode COML of the detection electrode block Rx2 is arranged adjacent to the second electrode 54B along the longitudinal direction of the second electrode 54B.

When the drive signal Vcom is supplied to the second electrode 54A, the first electrode COML of the detection electrode block Rx1 outputs a sensor output signal to the AFE48 according to the change in capacitance between the second electrode 54A and the second electrode 54A. At the same time, the first electrode COML of the detection electrode block Rx2 outputs a sensor output signal corresponding to the change in capacitance between the detection electrode block Rx2 and the second electrode 54B to AFE48 (see FIG. 1). In this way, each of the first electrode COML of the detection electrode block Rx1 and the detection electrode block Rx2 functions as a detection electrode. Therefore, even when the second electrodes 54A and 54B have a long shape, the position of the object to be detected can be detected in the region along the short side of the peripheral region Gd. As described above, touch detection is performed in the peripheral region Gd provided with the second electrode 54A and the peripheral region Gd provided with the second electrode 54B by the mutual capacitance method.

In this case, the number of the first electrode COML included in the detection electrode block Rx1 and the detection electrode block Rx2 is determined according to the number of channels of the AFE48. In the example shown in FIG. 19, eight first electrode COMLs are connected to AFE48 at the same time in the same detection period. Not limited to this, 7 or less or 9 or more first electrode COMLs may be connected to the AFE48.

Next, as shown in FIG. 20, the first electrode driver 14 supplies the drive signal Vcom to the second electrode 53A. The control unit 11 (see FIG. 1) selects a plurality of first electrode COMLs adjacent to the second electrode 53A as detection targets among the first electrode COMLs. Here, a plurality of first electrode COMLs arranged adjacent to the second electrode 53A in the second direction Dy are referred to as a detection electrode block Rx3.

The detection electrode block Rx3 outputs a sensor output signal corresponding to the change in capacitance between the second electrode 53A and the second electrode 53A to the AFE48. As a result, touch detection is performed on one of the long sides of the peripheral region Gd provided with the second electrode 53A. In the example shown in FIG. 20, eight first electrode COMLs arranged in the second direction Dy at the same time are connected to AFE48 in the same detection period.

Next, as shown in FIG. 21, the first electrode driver 14 supplies the drive signal Vcom to the second electrode 53B. The control unit 11 (see FIG. 1) selects a plurality of first electrode COMLs adjacent to the second electrode 53B as detection targets among the first electrode COMLs. Here, a plurality of first electrode COMLs arranged adjacent to the second electrode 53B in the second direction Dy are referred to as a detection electrode block Rx4.

The detection electrode block Rx4 outputs a sensor output signal corresponding to the change in capacitance between the second electrode 53B and the second electrode 53B to the AFE48. As a result, touch detection is performed on the other side of the long side of the peripheral region Gd provided with the second electrode 53B. Also in the example shown in FIG. 21, eight first electrode COMLs arranged in the second direction Dy at the same time are connected to AFE48 in the same detection period.

As described above, the plurality of first electrode COMLs arranged adjacent to the second electrodes 53A, 53B, 54A, 54B are a plurality of detection electrode blocks Rx1, Rx2, Rx3 including a predetermined number of first electrode COMLs. , Rx4. Assuming that the predetermined number is the first number and the total number of the first electrode COMLs is the second number, the first number is smaller than the second number. The first electrode driver 14 supplies the drive signal Vcom to the second electrodes 53A, 53B, 54A, 54B simultaneously or in a time-division manner. Then, for each of the detection electrode blocks Rx1, Rx2, Rx3, and Rx4, the first electrode COML outputs a sensor output signal corresponding to the change in capacitance to the AFE48. As a result, touch detection of the peripheral region Gd is performed by the mutual capacitance method. That is, in the present embodiment, the second electrodes 53A, 53B, 54A, 54B function as drive electrodes, and the first electrode COMLs of the detection electrode blocks Rx1, Rx2, Rx3, and Rx4 function as detection electrodes. By such a detection operation, the position of the object to be detected in the peripheral region Gd can be satisfactorily detected.

In FIGS. 19 to 21, touch detection is performed in a time-division manner for each of the eight first electrodes COML, but the present invention is not limited to this. For example, when the number of channels of AFE48 is sufficient, the detection electrode blocks Rx1, Rx2, Rx3, and Rx4 may include eight or more first electrode COMLs, or the second electrodes 53A, 53B, 54A, 54B may be driven at the same time. The detection electrode blocks Rx1, Rx2, Rx3, and Rx4 are composed of the first electrode COML located on the outermost peripheral side of the display region Ad, but are not limited thereto. The detection electrode blocks Rx1, Rx2, Rx3, and Rx4 may include a first electrode COML arranged inside the display region Ad. Further, in the touch detection of the display area Ad, the detected object can be detected based on the respective capacitance change of the first electrode COML by the self-capacitance method described above.

(Third embodiment)
FIG. 22 is a plan view of the first substrate according to the third embodiment. In the display device 1C of the present embodiment, a frame-shaped second electrode 56 is provided in the peripheral region Gd. The second electrode 56 has a first region 56a, a second region 56b, a third region 56c, and a fourth region 56d.

The first region 56a and the second region 56b have a long shape having a length in the second direction Dy. The third region 56c and the fourth region 56d have a long shape having a length in the first direction Dx. The third region 56c connects between one end of the first region 56a and one end of the second region 56b. The fourth region 56d connects between the other end of the first region 56a and the other end of the second region 56b. In this way, the second electrode 56 is continuously provided over the four sides of the peripheral region Gd and is formed in the shape of one continuous frame. The second electrode 56 is provided so as to surround the display area Ad. The second electrode 56 is connected to the driver IC 19 via the wiring 28A.

Also in this embodiment, as in the example shown in FIG. 12, in the peripheral region Gd, the second electrode 56 is provided on the insulating layer 24, that is, in the same layer as the pixel electrode 22, and is referred to as the first electrode COML. It is provided in different layers. Further, the first region 56a, the second region 56b, the third region 56c, and the fourth region 56d are provided in the same layer as each other, and are provided in the same layer as the pixel electrode 22.

In the second electrode 56 of the present embodiment, a guard ring provided for enhancing the reliability of the display operation can also be used as a drive electrode for touch detection. During the display operation, the first electrode driver 14 supplies a DC voltage signal having the same potential as the drive signal Vcomdc to the second electrode 56. As a result, the second electrode 56 can shield the noise of various circuits including the wirings 12a and 12b to improve the display reliability.

Further, also in the present embodiment, as in the second embodiment, the touch detection of the peripheral region Gd is performed by the mutual capacitance method. 23 to 25 are explanatory views for explaining an operation example of touch detection of the display device according to the third embodiment. The display device 1C of the present embodiment performs touch detection of the peripheral region Gd based on the change in capacitance between the second electrode 56 and the first electrode COML. Specifically, as shown in FIG. 23, the first electrode driver 14 supplies the drive signal Vcom to the second electrode 56.

The control unit 11 (see FIG. 1) selects a plurality of first electrode COMLs adjacent to the third region 56c among the first electrode COMLs as detection targets. Here, a plurality of first electrode COMLs arranged adjacent to the third region 56c in the first direction Dx are referred to as a detection electrode block Rx1. That is, the first electrode COML of the detection electrode block Rx1 is arranged adjacent to the third region 56c along the longitudinal direction of the third region 56c. Further, the control unit 11 (see FIG. 1) selects a plurality of first electrode COMLs adjacent to the fourth region 56d among the first electrode COMLs as detection targets. Here, a plurality of first electrode COMLs arranged adjacent to the fourth region 56d in the first direction Dx are referred to as a detection electrode block Rx2. That is, the first electrode COML of the detection electrode block Rx2 is arranged adjacent to the fourth region 56d along the longitudinal direction of the fourth region 56d.

When the drive signal Vcom is supplied to the second electrode 56, the first electrode COML of the detection electrode block Rx1 outputs a sensor output signal to the AFE48 according to the change in capacitance between the second electrode 56 and the third region 56c. At the same time, the first electrode COML of the detection electrode block Rx2 outputs a sensor output signal corresponding to the change in capacitance between the detection electrode block Rx2 and the fourth region 56d to AFE48 (see FIG. 1). In this way, each of the first electrode COML of the detection electrode block Rx1 and the detection electrode block Rx2 functions as a detection electrode. Therefore, even when the second electrode 56 has a frame shape, the position of the object to be detected can be detected in the region along the short side of the peripheral region Gd. As described above, the mutual capacitance method performs touch detection in the peripheral region Gd provided with the third region 56c and the peripheral region Gd provided with the fourth region 56d.

In this case, the number of the first electrode COML included in the detection electrode block Rx1 and the detection electrode block Rx2 is determined according to the number of channels of the AFE48. In the example shown in FIG. 23, eight first electrode COMLs are connected to the AFE48 at the same time in the same detection period. Not limited to this, 7 or less or 9 or more first electrode COMLs may be connected to the AFE48.

Next, as shown in FIG. 24, the first electrode driver 14 supplies the drive signal Vcom to the second electrode 56. The control unit 11 (see FIG. 1) selects a plurality of first electrode COMLs adjacent to the first region 56a as detection targets among the first electrode COMLs. Here, a plurality of first electrode COMLs arranged adjacent to the first region 56a in the second direction Dy are referred to as a detection electrode block Rx3.

The detection electrode block Rx3 outputs a sensor output signal corresponding to the change in capacitance between the first region 56a and the first region 56a to the AFE48. As a result, touch detection is performed in the peripheral region Gd provided with the first region 56a. In the example shown in FIG. 24, eight first electrode COMLs simultaneously arranged in the second direction Dy are connected to the AFE48 in the same detection period.

Next, as shown in FIG. 25, the first electrode driver 14 supplies the drive signal Vcom to the second electrode 56. The control unit 11 (see FIG. 1) selects a plurality of first electrode COMLs adjacent to the second region 56b among the first electrode COMLs as detection targets. Here, a plurality of first electrode COMLs arranged adjacent to the second region 56b in the second direction Dy are referred to as a detection electrode block Rx4.

The detection electrode block Rx4 outputs a sensor output signal corresponding to the change in capacitance between the second region 56b and the second region 56b to the AFE48. As a result, touch detection is performed in the peripheral region Gd provided with the second region 56b. Also in the example shown in FIG. 25, eight first electrode COMLs arranged in the second direction Dy at the same time are connected to the AFE48 in the same detection period.

As described above, the plurality of first electrode COMLs arranged adjacent to the second electrode 56 constitute a plurality of detection electrode blocks Rx1, Rx2, Rx3, and Rx4 including a predetermined number of first electrode COMLs. The first electrode driver 14 supplies the drive signal Vcom to the second electrode 56. Then, for each of the detection electrode blocks Rx1, Rx2, Rx3, and Rx4, the first electrode COML outputs a sensor output signal corresponding to the change in capacitance to the AFE48. As a result, touch detection of the peripheral region Gd is performed by the mutual capacitance method. That is, in the present embodiment, the second electrode 56 functions as a drive electrode, and each first electrode COML of the detection electrode blocks Rx1, Rx2, Rx3, and Rx4 functions as a detection electrode. By such a detection operation, the position of the object to be detected in the peripheral region Gd can be satisfactorily detected.

In the present embodiment, one second electrode 56 is provided in the peripheral region Gd. Therefore, as compared with the first embodiment and the second embodiment, the number of wirings 28A connecting the second electrode 56 and the driver IC 19 can be reduced, and the number of terminals of the driver IC 19 can be reduced. Can be done. Further, the circuit for scanning the second electrode 56 can be omitted.

(Fourth Embodiment)
FIG. 26 is a cross-sectional view showing a schematic cross-sectional structure of the display device according to the fourth embodiment. FIG. 27 is a plan view of the first substrate according to the fourth embodiment. FIG. 28 is a plan view of the cover substrate according to the fourth embodiment. As shown in FIG. 26, the display device 1D of the present embodiment has a cover substrate 51 in addition to the pixel substrate 2 and the facing substrate 3. The cover substrate 51 is provided apart from the first substrate 21 in a direction perpendicular to the surface of the first substrate 21. The cover substrate 51 is arranged on the opposite side of the pixel substrate 2 with respect to the facing substrate 3. In this embodiment, the cover substrate 51 is also referred to as a third substrate.

The cover substrate 51 is a protective member for covering and protecting the pixel substrate 2 and the facing substrate 3. The cover substrate 51 may be a glass substrate or a film-like substrate using a resin material or the like. The cover substrate 51 has a first surface 51a and a second surface 51b on the opposite side of the first surface 51a. The first surface 51a of the cover substrate 51 is a display surface on which an image is displayed, and is a detection surface on which the object to be detected is in contact with or in close proximity to the display surface. The second surface 51b of the cover substrate 51 faces the facing substrate 3 and is adhered to the facing substrate 3 via an adhesive layer (not shown).

In the present embodiment, the cover substrate 51 has an outer shape larger than that of the display panel 10 in a plan view. A colored layer 52 is provided on the second surface 51b of the cover substrate 51. The colored layer 52 is provided in the peripheral region Gd. Since the colored layer 52 is provided, it is possible to prevent various circuits and wirings such as the gate driver 12 and the source driver 13 from being visually recognized from the outside. The colored layer 52 is, for example, a decorative layer using a resin material or a metal material colored so as to suppress the transmission of light.

In the present embodiment, the second electrodes 53C and 53D are provided at positions overlapping with the colored layer 52 on the second surface 51b of the cover substrate 51. That is, the second electrodes 53C and 53D are provided on a layer different from that of the pixel electrode 22. The second electrodes 53C and 53D function as drive electrodes in touch detection of the peripheral region Gd.

The second electrodes 53C and 53D are not limited to a conductive material having translucency such as ITO. The second electrodes 53C and 53D are, for example, one or more metal layers selected from aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo), chromium (Cr) and tungsten (W). It may be formed. The second electrodes 53C and 53D may be formed of an alloy containing one or more selected from these metal materials, or may be a laminate in which a plurality of conductive layers formed of these materials are laminated. ..

As shown in FIG. 27, the second electrodes 53C and 53D are not provided in the peripheral region Gd of the first substrate 21. A plurality of first electrode COMLs are arranged in a matrix in the display area Ad of the first substrate 21. The configuration of the first electrode COML is the same as that of the second embodiment and the third embodiment. That is, also in this embodiment, the touch detection of the display area Ad is performed by the self-capacitance method. The guard ring described in the third embodiment may be provided in the peripheral region Gd of the first substrate 21.

FIG. 28 shows a plan view of the cover substrate 51 when viewed from the first surface 51a. The second electrodes 53C and 53D and the second electrode 54C are provided in the peripheral region Gd of the cover substrate 51. Further, the flexible substrate 73 is provided in the peripheral region Gd of the cover substrate 51. The flexible substrate 73 is provided at a position overlapping the flexible substrate 72 shown in FIG. 27. Alternatively, it is preferable that the flexible substrate 72 is provided on the same side as the side on which the flexible substrate 72 is provided.

The second electrodes 53C and 53D have a long shape having a length along the second direction Dy. The second electrode 54C has a long shape having a length along the first direction Dx. The second electrode 53C is provided on one of the long sides of the peripheral region Gd of the cover substrate 51, and the second electrode 53D is provided on the other side of the long side. Further, the second electrode 54C is provided on the short side of the peripheral region Gd of the cover substrate 51 to which the flexible substrate 73 is connected. The second electrodes 53C and 53D and the second electrode 54C are provided at positions that do not overlap with the first electrode COML in a plan view.

The second electrodes 53C and 53D are electrically connected to the flexible substrate 73 via the wiring L1, respectively. The second electrode 54C is electrically connected to the flexible substrate 73 via the wiring L2. The wiring L1 and the wiring L2 are connected to the terminal portion 73A via the wiring L3 provided on the flexible substrate 73. The terminal portion 73A of the flexible substrate 73 is connected to the terminal portion 72A of the flexible substrate 72 shown in FIG. 27. The terminal portion 72A is connected to the driver IC 19 via the wiring L4 provided on the flexible substrate 72. With such a configuration, the second electrodes 53C and 53D and the second electrode 54C provided on the cover substrate 51 are electrically connected to the driver IC 19.

Also in this embodiment, the second electrodes 53C and 53D and the second electrode 54C form a capacitance between the second electrodes 53C and 53D and the adjacent first electrodes COML in a plan view. In the display device 1D of the present embodiment, as in the second embodiment and the third embodiment, touch detection of the peripheral region Gd can be performed by the mutual capacitance method.

Specifically, in the touch detection of the peripheral region Gd, the first electrode driver 14 simultaneously or time-divisions the second electrodes 53C and 53D and the second electrode 54C, as in the examples shown in FIGS. 19 to 21. The drive signal Vcom is supplied. The control unit 11 (see FIG. 1) selects the detection electrode blocks Rx2, Rx3, and Rx4 (see FIGS. 19 to 21) simultaneously or in a time-division manner from the plurality of first electrode COMLs. In this embodiment, the second electrode is not provided in the peripheral region Gd on the opposite side of the second electrode 54C with respect to the display region Ad. Therefore, the detection electrode block Rx1 shown in FIG. 19 is not selected as the detection electrode.

The detection electrode blocks Rx2, Rx3, and Rx4 output a sensor output signal to the second electrode 53C, 53D and the second electrode 54C according to the change in capacitance between the second electrode 56 and the second electrode 56 to the AFE48. As a result, touch detection of the peripheral region Gd can be performed. The first electrode COML of the detection electrode blocks Rx2, Rx3, and Rx4 functions as detection electrodes, respectively. Therefore, the position of the object to be detected in the peripheral region Gd can be satisfactorily detected.

In the present embodiment, the second electrodes 53C and 53D and the second electrode 54C are provided on the cover substrate 51. Therefore, it is advantageous for narrowing the frame of the first substrate 21. Further, as compared with the second embodiment and the third embodiment, there are few restrictions on various wirings and circuits provided in the peripheral area Gd of the first substrate 21, so that the second electrodes 53C, 53D and the second electrodes 54C are used. It is possible to increase the area of. Therefore, the detection sensitivity of the touch detection of the peripheral region Gd can be improved.

(Fifth Embodiment)
FIG. 29 is a plan view of the first substrate according to the fifth embodiment. FIG. 30 is a plan view of the cover substrate according to the fifth embodiment. As shown in FIG. 29, the peripheral region Gd of the first substrate 21 is not provided with the second electrode. A plurality of first electrode COMLs are arranged in a matrix in the display area Ad of the first substrate 21. Also in this embodiment, the touch detection of the display area Ad is performed by the self-capacitance method. The guard ring described in the third embodiment may be provided in the peripheral region Gd of the first substrate 21.

In the display device 1E of the present embodiment, the second electrode 56A is provided in the peripheral region Gd of the cover substrate 51. The second electrode 56A is formed in a frame shape in the same manner as in the third embodiment shown in FIG. That is, the second electrode 56A has a first region 56Aa, a second region 56Ab, a third region 56Ac, and a fourth region 56Ad.

The first region 56Aa and the second region 56Ab have a long shape having a length in the second direction Dy. The third region 56Ac and the fourth region 56Ad have a long shape having a length in the first direction Dx. The third region 56Ac connects one end of the first region 56Aa and one end of the second region 56Ab. The fourth region 56Ad connects the other end of the first region 56Aa and the other end of the second region 56Ab. In this way, the second electrode 56A is formed in the shape of one continuous frame. The second electrode 56A is provided so as to surround the display area Ad.

The second electrode 56A is electrically connected to the flexible substrate 73 via the wiring L5 connected to the fourth region 56Ad. The wiring L5 is connected to the terminal portion 73A via the wiring L6 provided on the flexible substrate 73. The terminal portion 73A of the flexible substrate 73 is connected to the terminal portion 72A of the flexible substrate 72 shown in FIG. 29. The terminal portion 72A is connected to the driver IC 19 via the wiring L7 provided on the flexible substrate 72. With such a configuration, the second electrode 56A provided on the cover substrate 51 is electrically connected to the driver IC 19.

Also in this embodiment, the second electrode 56A forms a capacitance with the first electrode COML adjacent to each other in a plan view. Also in the display device 1E of the present embodiment, touch detection of the peripheral region Gd can be performed by the mutual capacitance method.

Specifically, in the touch detection of the peripheral region Gd, the first electrode driver 14 supplies the drive signal Vcom to the second electrode 56A. Similar to the example shown in FIGS. 19 to 21, the control unit 11 (see FIG. 1) selects the detection electrode blocks Rx1, Rx2, Rx3, and Rx4 simultaneously or in a time-division manner. The detection electrode blocks Rx1, Rx2, Rx3, and Rx4 output a sensor output signal to the AFE48 according to the change in capacitance between the detection electrode blocks Rx1, Rx2, Rx3, and Rx4. As a result, touch detection of the peripheral region Gd can be performed.

In the present embodiment, one second electrode 56A is provided in the peripheral region Gd of the cover substrate 51. Therefore, the number of wirings L5 connecting the second electrode 56A and the flexible substrate 73 can be reduced as compared with the fourth embodiment. Further, the number of wirings L6 and L7 provided on the flexible substrate 73 and the flexible substrate 72 can be reduced. Therefore, the configurations of the flexible substrate 73 and the flexible substrate 72 can be simplified.

(Sixth Embodiment)
FIG. 31 is a schematic diagram showing a connection configuration between the first electrode and the analog front-end circuit of the display device according to the sixth embodiment. FIG. 32 is a cross-sectional view taken along the line B1-B2 of FIG. Although the second electrode of the peripheral region Gd is omitted in FIG. 31, a configuration in which the second electrode is provided on the first substrate 21 is adopted as in the first to third embodiments described above. Can be done. Alternatively, as in the fourth embodiment and the fifth embodiment, a configuration in which the second electrode is provided on the cover substrate 51 can be adopted.

As shown in FIG. 31, in the display device 1F of the present embodiment, the COF75 is connected to the first substrate 21. The flexible substrate 72 is connected to the opposite side of the first substrate 21 with respect to the COF 75. The COF 75 includes a film-like base material 74 and a driver IC 19. The driver IC 19 is mounted on the base material 74. Further, the touch IC 18 is mounted on the flexible substrate 72. The touch IC 18 includes AFE48.

In the display device 1F of the present embodiment, the wiring L11 is provided at a position overlapping with the driver IC 19. The wiring L11 passes under the driver IC 19 to connect the connection circuit 17 and the AFE 48.

As shown in FIG. 32, the driver IC 19 is mounted on the base material 74 via the connecting member 81. The base material 74 is provided with wiring L11, wiring 74B, pads 74A, and pads 74C. The pad 74A is provided on the wiring 74B and is electrically connected to the wiring 74B. The wiring 74B is electrically connected to the first electrode COML. The pad 74C is provided on the wiring L11 and is electrically connected to the wiring L11.

The connecting member 81 is provided between the pad 74A of the base material 74 and the pad 19A of the driver IC 19. As a result, the driver IC 19 is electrically connected to the base material 74. The wiring L11 is provided under the dummy pad 19B of the driver IC 19 via the connecting member 81. In this way, the wiring L11 is provided so as to overlap with the driver IC 19. With such a configuration, the wiring L11 passes under the driver IC 19 and is connected to the AFE 48 from the connection circuit 17.

FIG. 33 is a cross-sectional view of the display device according to the modified example of the sixth embodiment. In this modification, the driver IC 19 is not provided with the dummy pad 19B. The wiring L11 is provided between the adjacent pads 19A and the pads 19A. Even with such a configuration, the wiring L11 passes under the driver IC 19 and is connected to the AFE 48 from the connection circuit 17. In addition, although FIG. 32 and FIG. 33 have described the configuration in which the wiring L11 is not electrically connected to the driver IC 19, the wiring L11 is not limited to this. It is also possible to adopt a configuration in which the wiring L11 is connected to the driver IC 19 and is electrically connected to the touch IC 18 via the circuit or wiring of the driver IC 19.

(7th Embodiment)
In the first to sixth embodiments, an example in which the first substrate 21 has a rectangular shape in a plan view is shown, but the present invention is not limited thereto. FIG. 34 is a plan view of the first substrate according to the seventh embodiment. In the display device 1G of the present embodiment, the first substrate 21A has an irregular shape in a plan view. The corner portion 102 of the first substrate 21A has a curved shape. The corner portion 102 is a portion of the side of the first substrate 21A where the extension line of one side extending in the first direction Dx and the extension line of one side extending in the second direction Dy intersect. Depending on the shape of the corner portion 102, the first electrodes COMLa, COMLb, COMLc, and COMLd arranged at the corner portion of the display region Ad have an outer diameter shape including a curve.

Further, among the sides of the first substrate 21A, a recess 101 is formed on the side opposite to the driver IC 19 with respect to the display area Ad. The recess 101 curves from the outer periphery of the first substrate 21A toward the display area Ad. The first electrodes COMLe and COMLf of the portion where the recess 101 is provided have a different shape according to the shape of the recess 101. Specifically, the first electrode COMLf has a rectangular shape having a width smaller than that of the other first electrode COMLs. Further, the first electrode COMLe has an outer diameter shape including a curved line that curves inward.

The two first electrode COMLf and the first electrode COMLf are arranged in the first direction Dx with the recess 101 interposed therebetween. Further, the two first electrode COMLe and the first electrode COMLe are arranged in the first direction Dx with the end of the recess 101 interposed therebetween. In such a first substrate 21A having an irregular shape, it may be difficult to secure the connection between the wiring 27 and the first electrode COML.

As shown in FIG. 34, wiring blocks 127A, 127B, 127C, 127D, 127E, 127F are provided for each first electrode COML arranged in the second direction Dy. The wiring blocks 127A, 127B, 127C, 127D, 127E, 127F include wirings 27a, 27b, 27c, 27d, 27e, 27f, 27g, and 27h, respectively. The wirings 27a, 27b, 27c, 27d, 27e, 27f, 27g, 27h are connected to the first electrode COML arranged in the second direction Dy, respectively. The wirings 27a, 27b, 27c, 27d, 27e, 27f, 27g, 27h are arranged in this order in the first direction Dx.

In the following description, when it is not necessary to distinguish the wirings 27a, 27b, 27c, 27d, 27e, 27f, 27g, and 27h, they are referred to as wiring 27.

The wiring block 127A and the wiring block 127F are arranged outside the first direction Dx with respect to the other wiring blocks 127B, 127C, 127D, and 127E. In the wiring block 127A, the wiring 27h is provided at a position farthest from the corner portion 102 in the first direction Dx, that is, at a position farthest from the outer periphery of the first substrate 21A. The wiring 27h is connected to the first electrode COMLa farthest from the driver IC 19. The wiring 27h is arranged on the center side of the display area Ad with respect to the wiring 27g.

In the first direction Dx, the wiring 27a is provided at a position closest to the corner portion 102, that is, a position closest to the outer periphery of the first substrate 21A. The wiring 27a is not connected to the first electrodes COMLa and COMLc at both ends of the first electrode COML arranged in the second direction Dy. The wiring 27a is connected to the first electrode COML at the center of the second direction Dy.

The wiring 27b is connected to the first electrode COML adjacent to the driver IC 19 with respect to the first electrode COML to which the wiring 27a is connected among the first electrode COMLs arranged in the second direction Dy. The wiring 27c is connected to the first electrode COML adjacent to the driver IC 19 with respect to the first electrode COML to which the wiring 27b is connected among the first electrode COMLs arranged in the second direction Dy. The wiring 27d is connected to the first electrode COML adjacent to the driver IC 19 on the side closer to the driver IC 19 with respect to the first electrode COML to which the wiring 27c is connected among the first electrode COML arranged in the second direction Dy. That is, in the first direction Dx, the wiring 27d provided between the wiring 27h farthest from the outer circumference of the first substrate 21A and the wiring 27a closest to the outer circumference of the first substrate 21A is the closest to the driver IC 19. It is connected to one electrode COMLc.

The wiring 27e is connected to the first electrode COML of the first electrode COML arranged in the second direction Dy, which is adjacent to the first electrode COML to which the wiring 27a is connected in the direction away from the driver IC 19. The wiring 27f, the wiring 27g, and the wiring 27h are connected to the first electrode COML at a position away from the driver IC 19 in this order.

That is, in FIG. 30, in the wiring block 127A, the wirings 27a, 27b, 27c, 27d, 27e, 27f, 27g, 27h are located on the wiring 27h farthest from the outer periphery of the first substrate 21A and on the outer periphery of the first substrate 21A. The wiring 27d provided between the wiring 27a and the nearest wiring 27a is connected to the first electrode COMLc closest to the driver IC 19. As the wiring 27d approaches the outer periphery of the first substrate 21A, that is, the wirings 27d, 27c, 27b, and 27a are connected to the first electrode COML at a position away from the driver IC 19 in this order. Further, as the distance from the outer circumference of the first substrate 21A increases from the wiring 27d, that is, the wirings 27d, 27e, 27f, 27g, and 27h are connected to the first electrode COML at a position away from the driver IC 19 in this order.

The wirings 27a, 27b, 27c, 27d, 27e, 27f, 27g, 27h of the wiring block 127F pass through the center of the first direction Dx of the recess 101 and with respect to the symmetric line AX along the second direction Dy. It is line symmetric with 127A. In the wiring block 127F, the wiring 27a is connected to the first electrode COMLb located at the position farthest from the driver IC 19. Further, the wiring 27h is not connected to the first electrodes COMLb and COMLd, but is connected to the first electrode COML at the center of the second direction Dy. The wiring 27e between the wiring 27a and the wiring 27h is connected to the first electrode COMLd. With such a configuration, it is possible to secure the connection with the wiring 27 also in the first electrodes COMLa, COMLb, COMLc, and COMLd arranged at the corners of the display area Ad.

The wiring block 127B is connected to each first electrode COML so as to be line-symmetrical with the wiring block 127A. The wiring block 127E is connected to each first electrode COML so as to be line-symmetrical with the wiring block 127F.

The wiring block 127C is connected to each first electrode COML in the same pattern as the wiring block 127B. The wiring block 127C and the wiring block 127D arranged in the vicinity of the recess 101 pass through the center of the first direction Dx of the recess 101 and are arranged line-symmetrically with respect to the symmetry line AX along the second direction Dy. .. Specifically, the wiring 27a of the wiring block 127C and the wiring 27h of the wiring block 127D are arranged with the recess 101 interposed therebetween, and are connected to the first electrodes COMLf and COMLf at the positions farthest from the driver IC 19, respectively. The wiring 27b of the wiring block 127C and the wiring 27g of the wiring block 127D are arranged near the end of the recess 101 and are connected to the first electrodes COMLe and COMLe, respectively.

The wiring 27c of the wiring block 127C and the wiring 27f of the wiring block 127D are connected to the first electrodes COML and COML adjacent to the first electrodes COMLe and COMLe on the side closer to the driver IC 19, respectively. The wiring 27d of the wiring block 127C and the wiring 27e of the wiring block 127D are adjacent to the side close to the driver IC 19 with respect to the first electrode COML to which the wiring 27c of the wiring block 127C and the wiring 27f of the wiring block 127D are connected. It is connected to the first electrodes COML and COML.

The wiring 27e of the wiring block 127C and the wiring 27d of the wiring block 127D are connected to the first electrodes COML and COML arranged at the positions closest to the driver IC 19. The wirings 27f, 27g, and 27h of the wiring block 127C are connected to the first electrode COML at a position away from the driver IC 19 in this order. The wirings 27c, 27b, and 27a of the wiring block 127D are connected to the first electrode COML at a position away from the driver IC 19 in this order.

As described above, among the plurality of first electrode COMLs, at least a pair of first electrodes (for example, the first electrode COMLe and the first electrode COML) pass through the recess 101 and intersect the first direction Dx in the second direction Dy. They are arranged adjacent to each other in the first direction Dx with the symmetry line AX along the line. The wiring connected to one of the pair of first electrodes COMLe (for example, wiring 27b) is arranged line-symmetrically with respect to the symmetric line AX with the wiring connected to the other first electrode COMLe (for example, wiring 27g). .. The wiring 27 of the wiring block 127C connected to each of the plurality of first electrode COMLs arranged in the second direction Dy includes the plurality of arranged first electrode COMLs and the plurality of first electrode COMLs adjacent to each other in the first direction Dx. The wiring 27 of the wiring block 127D connected to each of the above and the wiring 27 is arranged line-symmetrically with respect to the symmetric line AX. As a result, it is possible to secure the connection with the wiring 27 even in the first electrodes COMLe, COMLe, COMLf, and COMLf which are formed in a different shape corresponding to the shape of the recess 101.

The wiring patterns of the wiring blocks 127A, 127B, 127C, 127D, 127E, and 127F are not limited to the example shown in FIG. 34. FIG. 35 is a plan view of the first substrate according to the first modification of the seventh embodiment.

As shown in FIG. 35, in the display device 1H of this modification, the shape of the first substrate 21A is the same as that of FIG. 34. That is, in the first substrate 21A, the corner portion 102 is formed in a curved shape, and the recess 101 is formed on one side of the outer periphery.

In the wiring block 127A, the wiring 27h provided at the position farthest from the corner portion 102 in the first direction Dx, that is, the position farthest from the outer periphery of the first substrate 21A, is the position farthest from the driver IC 19. It is connected to one electrode COMLa. The wiring 27g adjacent to the wiring 27h in the first direction Dx is connected to the first electrode COMLc closest to the driver IC 19.

The wiring 27f adjacent to the wiring 27g is connected to the first electrode COML located closer to the driver IC 19 than the first electrode COMLa. The wiring 27e adjacent to the wiring 27f is connected to the first electrode COML at a position farther from the driver IC 19 than the first electrode COMLc. The wiring 27d adjacent to the wiring 27e is connected to the first electrode COML at a position closer to the driver IC 19 than the first electrode COML to which the wiring 27f is connected. The wiring 27c adjacent to the wiring 27d is connected to the first electrode COML at a position farther from the driver IC 19 than the first electrode COML to which the wiring 27e is connected. The wiring 27b adjacent to the wiring 27c is connected to the first electrode COML at a position closer to the driver IC 19 than the first electrode COML to which the wiring 27d is connected. The wiring 27a provided at the position closest to the corner portion 102, that is, the position closest to the outer periphery of the first substrate 21A, is the first electrode COML at both ends of the first electrode COML arranged in the second direction Dy. It is connected to the first electrode COML in the central portion removed. In this way, the wirings 27h, 27g, 27f, 27e, 27d, 27c, 27b, 27a are alternately connected to the first electrode COML and converge to the first electrode COML in the central portion. Also in this modification, the wiring 27g arranged between the wiring 27a and the wiring 27h is connected to the first electrode COMLc at the position closest to the driver IC19 among the first electrode COMLs arranged in the second direction Dy. To.

The wirings 27a, 27b, 27c, 27d, 27e, 27f, 27g, and 27h of the wiring block 127F are connected to each first electrode COML so as to be line-symmetrical with respect to the wiring block 127A. With such a configuration, it is possible to secure the connection with the wiring 27 also in the first electrodes COMLa, COMLb, COMLc, and COMLd arranged at the corners of the display area Ad.

Also in this modification, the wiring block 127C and the wiring block 127D at the positions corresponding to the recess 101 pass through the center of the first direction Dx of the recess 101 and are lined with respect to the symmetric line AX along the second direction Dy. Arranged symmetrically. As a result, it is possible to secure the connection with the wiring 27 even in the first electrodes COMLe, COMLe, COMLf, and COMLf which are formed in a different shape corresponding to the shape of the recess 101.

Further, in this modification, the wiring block 127B is connected to each first electrode COML so as to be asymmetric with respect to the wiring block 127A. The wiring block 127B is connected to each first electrode COML so as to be line-symmetrical with respect to the wiring block 127E. Such a wiring pattern may be used.

In addition, in FIG. 35, only the wiring block 127A and the wiring block 127F arranged on the outermost side in the first direction Dx, each of the wiring 27 is alternately connected to the first electrode COML, and the central portion thereof. The wiring pattern converges on the first electrode COML, but the wiring pattern is not limited to this. For example, assuming that the wiring block 127A and the wiring block 127B in FIG. 35 are representative of the arrangement of the wiring 27, the wiring block 127A and the wiring block 127B in FIG. 35 may be provided alternately. Alternatively, a plurality of wiring blocks 127B and one wiring block 127A may be arranged along the first direction Dx. Further, one wiring block 127B and a plurality of wiring blocks 127A may be arranged along the first direction Dx.

FIG. 36 is a plan view of the first substrate according to the second modification of the seventh embodiment. FIG. 37 is a plan view of the first substrate according to the third modification of the seventh embodiment. In the display device 1I of the second modification shown in FIG. 36, the wiring pattern of each wiring block 127A-127F is the same as that shown in FIG. 34. In the display device 1J of the third modification shown in FIG. 37, the wiring pattern of each wiring block 127A-127F is the same as that shown in FIG. 35.

In the modified example shown in FIGS. 36 and 37, the point that the dummy wiring Ld is provided is different from the display device 1G of FIG. 34 and the display device 1H of FIG. 35. As shown in FIGS. 36 and 37, the wiring 27 is connected to the first electrode COML at the contact hole H1, respectively. A dummy wiring Ld extending in a direction parallel to the wiring 27 is provided on the first electrode COML at a position farther from the driver IC 19 than the first electrode COML connected to the wiring 27.

The dummy wiring Ld is arranged so as to overlap with the first electrode COML. The dummy wiring Ld and the wiring 27 are separated by a slit SL. Further, a plurality of dummy wiring Lds are arranged in the second direction Dy. In this case, the dummy wirings Ld are separated from each other by the slit SL. The dummy wiring Ld may be electrically connected to the first electrode COML arranged so as to overlap the dummy wiring Ld. In the example shown in FIGS. 32 and 33, the width of the slit SL is the same as the distance between the first electrodes COML adjacent to each other in the second direction Dy.

The same material as the wiring 27 is used for the dummy wiring Ld. Further, the dummy wiring Ld is arranged with the same width and the same arrangement pitch as the wiring 27. By providing the dummy wiring Ld in this way, the variation in the light transmittance between the portion where the wiring 27 is provided and the portion where the dummy wiring Ld is provided is suppressed. Therefore, the display devices 1I and 1J can obtain good visibility.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to such an embodiment. The contents disclosed in the embodiments are merely examples, and various changes can be made without departing from the spirit of the present invention. Appropriate changes made without departing from the spirit of the present invention naturally belong to the technical scope of the present invention.

For example, the display device of this aspect can take the following aspects.
(1) Board and
A plurality of first electrodes arranged in a matrix in the display area of the substrate,
A plurality of second electrodes arranged in a peripheral region outside the display region of the substrate, and
A drive unit that supplies a drive signal to the first electrode and the second electrode,
A plurality of wirings connected to each of the plurality of first electrodes,
Have,
The first electrode is electrically connected to the drive unit via the wiring.
The first electrode and the second electrode are display devices that output detection signals according to their respective changes in self-capacitance.
(2) A plurality of the second electrodes are provided along at least one side of the peripheral region.
The display device according to (1) above, wherein the arrangement pitch of the second electrode is equal to the arrangement pitch of the first electrode in a direction along one side of the peripheral region.
(3) The display device according to (1) or (2) above, wherein the second electrode surrounds the plurality of the first electrodes and is provided on four sides of the peripheral region.
(4) The first electrode and the second electrode constitute a plurality of detection electrode blocks, and the first electrode and the second electrode form a plurality of detection electrode blocks.
The display device according to any one of (1) to (3) above, wherein the drive unit supplies the drive signal to the plurality of detection electrode blocks in a time-division manner.
(5) The display device according to any one of the above (1) to (4), wherein the plurality of the first electrodes and the plurality of the second electrodes are provided on different layers from each other.
(6) Board and
A plurality of first electrodes arranged in a matrix in the display area of the substrate,
A second electrode provided along at least one side of the peripheral region outside the display region, and
A drive unit that supplies a drive signal to the second electrode,
Wiring connected to each of the plurality of first electrodes and
Have,
The first electrode is electrically connected to the drive unit via the wiring.
A display device that outputs a detection signal according to a change in capacitance between the first electrode and the second electrode when the drive signal is supplied to the second electrode.
(7) The second electrode is continuously provided along at least one side of the peripheral region.
The display device according to (6) above, wherein the plurality of the first electrodes are arranged adjacent to the second electrode in the longitudinal direction of the second electrode.
(8) The display device according to (6) or (7) above, wherein the second electrode surrounds the plurality of the first electrodes and is provided on each of the four sides of the peripheral region.
(9) The display device according to (6) or (7) above, wherein the second electrode is continuously provided over four sides of the peripheral region.
(10) The plurality of the first electrodes arranged adjacent to the second electrode constitute a plurality of detection electrode blocks.
The display device according to (8) or (9) above, wherein the first electrode outputs the detection signal for each detection electrode block.
(11) A cover substrate provided apart from the substrate in a direction perpendicular to the surface of the substrate is provided.
The display device according to any one of (6) to (10) above, wherein the second electrode is provided in the peripheral region of the cover substrate.
(12) The display device according to any one of (1) to (11) above, further comprising a connection switching circuit for switching connection and disconnection between the first electrode and the drive unit.
(13) On the outer periphery of the substrate, in a plan view, a side along the first direction in a plane parallel to the surface of the substrate and a side along the second direction intersecting with the first direction intersect. The corners are provided in a curved shape,
A plurality of the wirings connected to the plurality of first electrodes arranged in the second direction are arranged in the first direction.
The wiring farthest from the outer periphery of the substrate in the first direction is electrically connected to the first electrode farthest from the drive unit.
The wiring arranged between the wiring arranged at a position closest to the outer periphery of the substrate in the first direction and the wiring arranged farthest from the outer circumference of the substrate is the first wiring arranged closest to the drive unit. The display device according to any one of the above (1) to (12), which is electrically connected to an electrode.
(14) The outer periphery of the substrate is provided with a recess recessed toward the display area on a side along a first direction in a plane parallel to the surface of the substrate in a plan view.
Of the plurality of the first electrodes, at least a pair of the first electrodes are arranged adjacent to each other in the first direction with a symmetric line along the second direction passing through the recess and intersecting the first direction. Ori,
The wiring connected to one of the pair of the first electrodes is arranged line-symmetrically with respect to the line of symmetry with the wiring connected to the other first electrode. The display device according to any one of 13).
(15) The above (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) to (1) The display device according to any one of (14) above.

1, 1A-1J Display device 2 Pixel board 3 Opposing board 6 Liquid crystal layer 10 Display panel 11 Control unit 17 Connection circuit 18 Touch IC
19 Driver IC
20 Display unit 21 1st board 22 Pixel electrodes 27, 28A, 28B, 28C Wiring 30 Touch sensor 31 2nd board 40 Detection unit 48 Analog front-end circuit 51 Cover board 53, 53A, 53B, 54, 54A, 54B, 55, 56, 56A 2nd electrode 72, 73 Flexible substrate 72A, 73A Terminal part 74 Base material 75 COF
COML 1st electrode

Claims (10)

With the board
A plurality of first electrodes arranged in a matrix in the display area of the substrate,
A plurality of second electrodes arranged in a peripheral region outside the display region of the substrate, and a plurality of second electrodes.
A drive unit that supplies a drive signal to the first electrode and the second electrode,
A plurality of first wirings provided in the display area and connected to each of the plurality of first electrodes, and a plurality of first wirings.
One or more second wires that have passed through the display area and are connected to each of the plurality of second electrodes.
Have,
The first electrode and the second electrode are electrically connected to the drive unit via the first wiring and the second wiring .
The plurality of first electrodes are display devices that output detection signals according to their respective changes in self-capacitance. A plurality of the second electrodes are provided along one side of the peripheral region facing the driving unit via the display region .
The arrangement pitch of the second electrode is equal to the arrangement pitch of the first electrode in the direction along one side of the peripheral region.
The display device according to claim 1 , wherein the plurality of second electrodes output detection signals according to their respective changes in self-capacitance . The display device according to claim 1, wherein the second electrode is provided along one side of the peripheral region facing the drive unit via the display region. The width of the second electrode is substantially equal to the width of the display area.
The display device according to claim 3. When the drive signal is supplied to the second electrode, the first electrode outputs a detection signal according to a change in capacitance between the second electrode and the second electrode.
The display device according to claim 3 or 4. The first electrode and the second electrode constitute a plurality of detection electrode blocks, and the first electrode and the second electrode form a plurality of detection electrode blocks.
The display device according to any one of claims 1 to 5 , wherein the drive unit supplies the drive signal to the plurality of detection electrode blocks in a time-division manner. The display device according to any one of claims 1 to 6 , wherein the plurality of the first electrodes and the plurality of the second electrodes are provided on different layers from each other. The display device according to any one of claims 1 to 7, wherein the first wiring and the second wiring are provided on the same layer as each other. The display device according to any one of claims 1 to 8, wherein the second wiring overlaps with the first electrode in the display area. The first electrode, which is located farther from the drive unit than the first electrode connected to the first wiring, is provided with a dummy wiring extending in a direction parallel to the first wiring. The display device according to any one of 1 to 9 .

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