JP2018160201A - Display with touch sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display with a touch sensor that can simplify the wiring of the entire display.SOLUTION: A display with a touch sensor comprises: a substrate including a plurality of pixels that are arranged in matrix, a plurality of video signal lines that supply video voltage to the pixels, and a plurality of scan signal lines that supply scan voltage to the pixels; and a piezoelectric layer and a first sensor electrode that form the touch sensor detecting the presence/absence of a pressing force. The video signal lines or the scan signal lines function as a second sensor electrode of the touch sensor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device with a touch sensor.

  Patent Document 1 discloses a display device including a touch position detection sensor substrate that detects a touch position on the back side of a liquid crystal display element.

JP 2008-84222 A

  If a touch sensor substrate for detecting the presence or absence of pressure is provided on the back side of the display device, the wiring structure for the entire display device becomes complicated because the number of pressure detection wires increases in addition to the pixel writing wires.

  The present invention has been made in view of the above problems, and an object thereof is to provide a display device with a touch sensor capable of simplifying wiring of the entire display device.

  The display device with a touch sensor according to the present invention includes a plurality of pixels arranged in a matrix, a plurality of video signal lines for supplying a video voltage to each pixel, and a plurality of scanning signals for supplying a scanning voltage to each pixel. A video signal line or a scanning signal line, comprising: a substrate including a line; a piezoelectric layer that is disposed on a back surface side of the substrate and that constitutes a touch sensor that detects presence or absence of pressing; and a first sensor electrode. Functions as a second sensor electrode of the touch sensor.

It is a schematic diagram which shows the structure of the outline of the display apparatus with a touch sensor which concerns on embodiment of this invention. It is a schematic sectional drawing of the display apparatus with a touch sensor which concerns on this embodiment. It is a figure which shows schematic structure of the touch sensor which concerns on this embodiment. It is a figure which shows the timing of the press detection operation | movement of the display apparatus with a touch sensor which concerns on this embodiment. It is a figure which shows the timing of the press detection operation | movement of the display apparatus with a touch sensor which concerns on this embodiment. It is a top view which shows the whole structure of the display apparatus with a touch sensor which concerns on this embodiment. It is VII-VII sectional drawing in FIG. It is VII-VII sectional drawing in FIG. It is a figure explaining the 1st manufacturing method of the display apparatus with a touch sensor concerning this embodiment. It is a figure explaining the 1st manufacturing method of the display apparatus with a touch sensor concerning this embodiment. It is a figure explaining the 1st manufacturing method of the display apparatus with a touch sensor concerning this embodiment. It is a figure explaining the 2nd manufacturing method of the display apparatus with a touch sensor concerning this embodiment. It is a figure explaining the 2nd manufacturing method of the display apparatus with a touch sensor concerning this embodiment. It is a figure explaining the 2nd manufacturing method of the display apparatus with a touch sensor concerning this embodiment. It is a figure explaining the 2nd manufacturing method of the display apparatus with a touch sensor concerning this embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, an organic EL display device will be described as an example. However, the display device according to the present invention is not limited to the organic EL display device, and may be a liquid crystal display device, for example.

  In addition, the drawings referred to in the following description may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with the actual mode for clarity of explanation, but are merely examples. However, it does not limit the interpretation of the present invention. Further, in the present specification and each drawing, the same elements as those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

  Further, in the detailed description of the present invention, when defining the positional relationship between a certain component and another component, “up” and “under” are only when they are positioned directly above or directly below a certain component. In addition, unless otherwise specified, the case where another component is further interposed is included.

  FIG. 1 is a schematic diagram showing a schematic configuration of a display device with a touch sensor according to an embodiment of the present invention. The display device with a touch sensor 1 includes a pixel array unit 4 that displays an image, a drive unit that drives the pixel array unit 4, a piezoelectric layer 5, a touch detection electrode 9, and a touch detection circuit 35. The schematic diagram shown in FIG. 1 is an example, and the present embodiment is not limited to this.

  In the pixel array unit 4, OLEDs 6 and pixel circuits 8 are arranged in a matrix corresponding to the pixels. The pixel circuit 8 includes a plurality of TFTs (lighting TFTs 10 and driving TFTs 12) and capacitors 14.

  The drive unit includes a scanning line drive circuit 20, a video line drive circuit 22, a drive power supply circuit 24, and a control device 26, and drives the pixel circuit 8 to control light emission of the OLED 6.

  The scanning line driving circuit 20 is connected to a scanning signal line 28 provided for each horizontal arrangement (pixel row) of pixels. The scanning line driving circuit 20 sequentially selects the scanning signal lines 28 according to the timing signal input from the control device 26, and outputs a scanning voltage for turning on the lighting TFT 10 to the selected scanning signal line 28.

  The video line driving circuit 22 is connected to a video signal line 30 provided for each vertical arrangement (pixel column) of pixels. The video line driving circuit 22 receives a video signal from the control device 26, and outputs a video voltage corresponding to the video signal of the selected pixel row in accordance with the selection of the scanning signal line 28 by the scanning line driving circuit 20. Output to line 30. The voltage is written into the capacitor 14 via the lighting TFT 10 in the selected pixel row. The driving TFT 12 supplies a current corresponding to the written voltage to the OLED 6, whereby the OLED 6 of the pixel corresponding to the selected scanning signal line 28 emits light.

  The drive power supply circuit 24 is connected to a drive power supply line 32 provided for each pixel column, and supplies a current to the OLED 6 through the drive power supply line 32 and the drive TFT 12 of the selected pixel row.

  Here, the lower electrode of the OLED 6 is connected to the driving TFT 12. On the other hand, the upper electrode of each OLED 6 is configured by an electrode common to the OLED 6 of all pixels. When the lower electrode is configured as an anode (anode), a high potential is input, and the upper electrode is a cathode (cathode) and a low potential is input. When the lower electrode is configured as a cathode (cathode), a low potential is input, and the upper electrode is an anode (anode) and a high potential is input.

  The pixel circuit 8 is not limited to the circuit configuration shown in FIG. The driving TFT 12 that controls the current value supplied to the OLED 6 is provided between the driving power supply line 32 and the OLED 6, but the connection of the lighting TFT 10 and the capacitor 14 is not limited to this. The pixel circuit 8 may further include other TFTs.

  Further, in the display device with a touch sensor 1 of the present embodiment, the touch sensor layer 11 is formed on the back surface side of the array substrate 40 (see FIG. 2) having the pixel array unit 4. The touch sensor layer 11 includes a piezoelectric layer 5 and a touch detection electrode 9. Thereby, the scanning signal line 28 or the video signal line 30 of the pixel array unit 4, the piezoelectric layer 5, and the touch detection electrode 9 constitute a touch sensor. The touch sensor of this embodiment is a pressure-sensitive sensor that detects the presence or absence of a touch (press). The pressure-sensitive sensor has a structure in which a flexible piezoelectric material that is elastically deformed is sandwiched between two electrodes. The pressure-sensitive sensor is pressed from the capacitance change between the two electrodes caused by applying pressure to the pressure-sensitive sensor. The presence or absence is detected. In the present embodiment, the touch detection electrode 9 functions as one electrode (first sensor electrode) of the touch sensor, and the scanning signal line 28 or the video signal line 30 serves as the other electrode (second sensor electrode) of the touch sensor. Function.

  The touch detection circuit 35 detects the presence or absence of a touch (press) on the display surface of the display device with a touch sensor 1. The touch detection circuit 35 is electrically connected to the first sensor electrode (touch detection electrode 9) and the second sensor electrode (scanning signal line 28 or video signal line 30), and the first sensor electrode and the second sensor electrode. The pressure on the display surface is detected by detecting the capacitance between the two.

  The detection of pressure by the touch sensor according to the present embodiment will be described with reference to FIGS. FIG. 2 is a schematic cross-sectional view of the display device with a touch sensor according to the present embodiment. As shown in FIG. 2, the display device with a touch sensor 1 is disposed on the array substrate 40, the counter substrate 60 disposed to face the array substrate 40, and the back side of the array substrate 40 (on the side opposite to the counter substrate 60). The touch sensor layer 11 is provided. In the array substrate 40, a circuit layer 74, an OLED 6, and a sealing layer 106 are formed on a base material 70. The touch sensor layer 11 includes a piezoelectric layer 5, an interlayer insulating film 7, and a touch detection electrode 9. The interlayer insulating film 7 may not be formed. The scanning signal line 28 or the video signal line 30 of the circuit layer 74, the piezoelectric layer 5, and the touch detection electrode 9 constitute a touch sensor according to this embodiment. In FIG. 2, the surface side (upper side in the figure) of the counter substrate 60 is the display surface of the display device 1 with a touch sensor. As shown in FIG. 2, when the display surface is pressed with a finger or the like, the surface of the piezoelectric layer 5 is polarized, and the first sensor electrode (touch detection electrode 9) and the second sensor electrode (scanning signal line 28 or video signal line). 30) increases compared to the case of no pressing. In this way, the pressure on the display surface can be detected by detecting the change in capacitance between the first sensor electrode and the second sensor electrode.

  FIG. 3 is a diagram illustrating a schematic configuration of the touch sensor according to the present embodiment. As shown in FIG. 3, when the scanning signal line 28 is used as the second sensor electrode, the plurality of scanning signal lines 28 are short-circuited to form one electrode. Specifically, a plurality of scanning signal lines 28 are connected in common at the ends and are connected to the touch detection circuit 35. When the video signal line 30 is used as the second sensor electrode, the plurality of video signal lines 30 are short-circuited to form one electrode. Specifically, a plurality of video signal lines 30 are connected in common at the ends, and are connected to the touch detection circuit 35. Note that all the scanning signal lines 28 (or video signal lines 30) provided on the array substrate 40 may be used as the scanning signal lines 28 (or video signal lines 30) used as the second sensor electrodes. Some scanning signal lines 28 (or video signal lines 30) may be used. Each scanning signal line 28 or each video signal line 30 is short-circuited with the touch detection circuit 35 via a switch 36, and is interrupted by the switch 36 during normal driving. To do.

  In the present embodiment, since the scanning signal line 28 or the video signal line 30 for pixel writing is used as the second sensor electrode of the touch sensor, the pressure detection operation and the pixel writing operation are controlled in a time division manner. FIG. 4 is a diagram illustrating the timing of the pressing detection operation of the display device with a touch sensor according to the present embodiment. As shown in FIG. 4, one horizontal period (1H) is divided into a pressing detection period (T1) and a pixel writing period (T2), and the pressing detection operation and the pixel writing operation are controlled in a time-sharing manner. That is, the pressure detection by the touch detection circuit 35 is performed in a period in which pixel writing is not performed in one horizontal period (1H). Further, when the scanning signal line 28 is used as the second sensor electrode, the pressure detection may be performed during a period in which the scanning signal line 28 serving as the second sensor electrode is not selected. When the video signal line 30 is used as the second sensor electrode, the pressure detection may be performed during a period in which the video voltage is not applied to the video signal line 30 serving as the second sensor electrode.

  As described above, in the present embodiment, the pixel detection scanning signal line 28 or the video signal line 30 functions as the second sensor electrode of the touch sensor by controlling the pressure detection operation and the pixel writing operation in a time-sharing manner. Can be made.

  Furthermore, the display device 1 with a touch sensor according to the present embodiment may include a touch position detection sensor in addition to the pressure sensor. The touch position detection sensor detects a touch position on the display surface of the display device with a touch sensor 1. As the touch position detection sensor used in the present embodiment, a capacitance coupling method for detecting a change in the capacitance at the touch position, a resistance film method for detecting a change in the resistance value at the touch position, and other known methods can be used. For example, the capacitive coupling type touch position detection sensor includes a plurality of first electrodes extending in the horizontal direction and a plurality of second electrodes extending in the vertical direction. Since the capacitance between the first electrode and the second electrode changes depending on the presence or absence of touch, the drive signal (Tx) is sequentially output to the first electrode, and the detection signal (Rx) generated on the second electrode is detected. By doing so, the touch position can be detected. Further, the touch position detection sensor may be provided outside the counter substrate 60 or may be provided inside the counter substrate 60.

  When the display device with a touch sensor 1 includes a pressure-sensitive sensor and a touch position detection sensor, it is necessary to control the pressure detection operation, the pixel writing operation, and the touch position detection operation in a time-sharing manner. FIG. 5 is a diagram illustrating the timing of pressing detection in the display device with a touch sensor according to the present embodiment. As shown in FIG. 5, one horizontal period (1H) is divided into a press detection period (T1), a pixel writing period (T2), and a touch position detection period (T3). The detection operation is controlled in a time division manner. That is, the pressure detection by the touch detection circuit 35 is performed in a period in which pixel writing is not performed and a period in which the touch position is not detected in one horizontal period (1H).

  As described above, in this embodiment, even when a touch position detection sensor is included, the pressure detection accuracy is improved by controlling the pressure detection operation, the touch position detection operation, and the pixel writing operation in a time-sharing manner. Can be improved.

  Next, the structure of the display device 1 with a touch sensor according to the present embodiment will be described. FIG. 6 is a plan view showing the overall structure of the display device with a touch sensor according to the present embodiment. The display device with a touch sensor 1 has a display area A in which the pixel array unit 4 shown in FIG. 1 is provided, a frame area B surrounding the display area A, and a component mounting area C for mounting various components. .

  7A and 7B are cross-sectional views taken along the line VII-VII in FIG. In FIG. 7A and FIG. 7B, the counter substrate 60 is not shown. FIG. 7A is a diagram illustrating the vicinity of a pixel in the display area A of the display device 1 with a touch sensor. 7B shows a part for supplying a predetermined potential to the cathode electrode (upper electrode 104) in the frame area B (cathode contact portion 140) and a part for mounting the driver integrated circuit IC or the like in the component mounting area C ( It is a figure which shows the terminal part 150).

  As shown in FIGS. 7A and 7B, the array substrate 40 of the display device with a touch sensor 1 of the present embodiment has a circuit layer 74 made of TFTs (lighting TFTs 10 and driving TFTs 12) and various wirings on a base material 70, The OLED 6 corresponding to each pixel, the sealing layer 106 that seals the OLED 6, and the like are stacked. The substrate 70 is made of a flexible resin such as glass or polyimide, for example.

  The OLED 6 includes a lower electrode 100, an organic material layer 102, and an upper electrode 104. The lower electrode 100, the organic material layer 102, and the upper electrode 104 are laminated in this order from the base material 70 side. In the present embodiment, the lower electrode 100 is the anode (anode) of the OLED 6 and the upper electrode 104 is the cathode (cathode).

  In the circuit layer 74, the pixel circuit 8, the scanning signal line 28, the video signal line 30, the drive power supply line 32, and the like described above are formed. At least a part of the driving unit can be formed as a circuit layer on the substrate 70 in a region adjacent to the display region A.

  The lower electrode 100 is formed for each pixel in the display area. The lower electrode 100 is made of a material having conductivity, and is preferably made of ITO, for example, but may be a material having translucency and conductivity, such as IZO, zinc oxide, indium oxide, and aluminum oxide. When the display device takes out the light emission of the OLED 6 on the lower electrode side, the lower electrode 100 is formed as a transparent electrode, and when the display device takes out the light emission of the OLED 6 on the upper electrode side, the lower electrode 100 is formed as a reflection electrode. Is preferred.

  The organic material layer 102 is a layer having at least a light emitting layer, and is formed in contact with the lower electrode 100. The organic material layer 102 includes, for example, a hole transport layer, a light emitting layer, an electron transport layer, and the like. The light emitting layer is made of, for example, an organic EL material that emits light by combining holes and electrons. As such an organic EL substance, for example, a general organic light emitting material may be used. The organic material layer 102 includes a hole injection layer and an electron blocking layer disposed between the anode and the light emitting layer, and an electron injection layer and a hole blocking layer disposed between the cathode and the light emitting layer. It may be configured.

  The upper electrode 104 is formed so as to cover the organic material layer 102 in the entire display region. Since the upper electrode 104 has such a configuration, the upper electrode 104 is in common contact with the organic material layers 102 of the plurality of OLEDs 6 in the display region A. The upper electrode 104 is made of a material having translucency and conductivity, and is preferably, for example, ITO. However, a conductive metal oxide such as ITO or InZnO mixed with a metal such as silver or magnesium, or silver Alternatively, a metal thin film such as magnesium or magnesium and a conductive metal oxide may be laminated. When the display device takes out the light emission of the OLED 6 on the lower electrode side, the upper electrode 104 is formed as a reflective electrode, and when the display device takes out the light emission of the OLED 6 on the upper electrode side, the upper electrode 104 is formed as a transparent electrode. Is preferred.

  The sealing layer 106 is formed on the upper electrode 104 so as to cover the entire substrate 70. The sealing layer 106 is formed so as to cover the entire surface of the base material 70, thereby preventing oxygen and moisture from penetrating into each layer including the circuit layer 74 and the OLED 6. The sealing layer 106 includes an organic layer 160 and a first inorganic layer 161 and a second inorganic layer 162 that sandwich the organic layer 160 between the upper and lower sides.

  Further, a conductor film 111 made of a transparent metal such as ITO and a metal layer 113 are disposed below the lower electrode 100, and a capacitance is provided between the lower electrode 100 and the metal layer 113. A capacitor insulating layer 98 made of silicon nitride is formed for storage.

  Further, a TFT 12 is formed below each OLED 6, and a flattening layer 96 for flattening a step generated by the TFT 12 is formed of an organic insulating film. As shown in FIG. 2, the TFT 12 of the array substrate 40 of the display device with a touch sensor 1 according to the present embodiment is a top gate type, and a gate electrode 86 is formed above the active layer 82 via a gate insulating film 84. Is formed. The gate electrode 86 constitutes the scanning signal line 28. Further, the wiring layer 90 (source electrode 90a, drain electrode 90b) is connected to the semiconductor film forming the active layer 82 through holes formed in the interlayer insulating film 88 and the gate insulating film 84. The wiring layer 90 constitutes the video signal line 30. As the gate insulating film 84 and the interlayer insulating film 88, for example, an inorganic insulating material such as silicon nitride (SiNy) or silicon oxide (SiOx) is used.

  If the TFT 72 shown in FIG. 7A is a drive TFT 12 having an n channel, the source electrode 90a connected to the active layer 82 is further electrically connected to the lower electrode 100. A contact hole 110 for connecting the source electrode 90 a and the lower electrode 100 is formed in the planarization layer 96. In the contact hole 110 formed in the planarization layer 96, the source electrode 90 a and the lower electrode 100 are connected via the conductor film 111. In addition, on the region where the TFT 12 is formed and above the contact hole 110 for connecting the lower electrode 100 and the source electrode 90a, a bank 112 separating each pixel in the display region A is formed of an organic insulating film. . As shown in FIG. 2A, the organic material layer 102 and the upper electrode 104 are also formed on the surface after the bank 112 is formed.

  7B is a diagram showing a cathode contact portion (left side in FIG. 7B) formed in the frame region B of the display device with a touch sensor 1 of the present embodiment (left side in FIG. 7B) and a terminal portion (right side in FIG. 7B) formed in the component mounting region C. It is. In the cathode contact portion 140 formed in the frame region B, a part of the metal layer 113 described above is connected to the upper electrode 104 via the conductor film 111. As a result, a predetermined potential is supplied to the cathode electrode (upper electrode 104) via the metal layer 113 and the conductor film 111. A wiring 116 connected to the display area A is formed in the circuit layer 74 in the component mounting area C. A conductor film 117 is formed on the wiring 116, and an insulating film 118 is formed on the conductor film 117. A part of the insulating film 118 is removed, and the portion where the conductive film 117 is exposed (terminal portion 150) is mounted with the driver integrated circuit IC that constitutes the driving portion described above or is connected to the FPC. .

  In the display device with a touch sensor 1 according to the present embodiment, the touch sensor layer 11 is formed on the back surface side of the array substrate 40 in the display area A and the frame area B. The touch sensor layer 11 includes a piezoelectric layer 5 and a touch detection electrode 9 serving as a first sensor electrode of the touch sensor. In FIG. 7, the piezoelectric layer 5 is formed on the back surface side of the substrate 70, and the touch detection electrode 9 is formed on the back surface side of the piezoelectric layer 5. The piezoelectric layer 5 is formed on the back surface side of the base material 70 without a gap. More specifically, no conductive layer is disposed between the piezoelectric layer 5 and the base material 70. When a conductive layer is disposed between the piezoelectric layer 5 and the base material 70, the conductive layer functions as the second sensor electrode of the touch sensor. Therefore, in the display device with a touch sensor 1 according to the present embodiment, the piezoelectric layer is piezoelectric. The conductive layer is not included between the layer 5 and the base material 70. The piezoelectric layer 5 is made of a piezoelectric material such as ceramics. Alternatively, when a display device is formed on a flexible substrate, polylactic acid or the like may be used as the piezoelectric layer 5 so as not to hinder the flexibility. The touch detection electrode 9 is made of a conductive material such as metal. Furthermore, in this embodiment, since the piezoelectric layer 5 and the touch detection electrode 9 are formed on the back surface side of the array substrate 40, not only the transmissive material but also a non-transmissive material can be used. Then, the gate electrode 86 (corresponding to the scanning signal line 28) or the wiring layer 90 (corresponding to the video signal line 30) in FIG. 7 is used as the second sensor electrode of the touch sensor. As described above, in this embodiment, the touch sensor layer 11 constituting the touch sensor is formed on the back side of the array substrate 40 without any gap, and the gate electrode 86 or the wiring layer 90 is used as the second sensor electrode constituting the touch sensor. As a result, the touch sensor is formed integrally with the array substrate 40.

  In the present embodiment, the pixel writing gate electrode 86 or the wiring layer 90 formed on the array substrate 40 is used as the second sensor electrode of the touch sensor, so there is no need to separately provide the second sensor electrode. Wiring of the attached display device 1 can be simplified.

  In the present embodiment, the touch sensor layer 11 is formed on the back side of the array substrate 40. When a so-called on-cell type in which the touch sensor is formed between the sealing layer 106 and the counter substrate 60 is used, it is necessary to form the touch sensor by a process in which the lower OLED 6 does not deteriorate. There are restrictions on the processing solvent. On the other hand, in the present embodiment, since the touch sensor layer 11 is formed on the back surface side of the array substrate 40, it is possible to reduce process restrictions.

  A method for manufacturing the display device with a touch sensor 1 according to the present embodiment will be described with reference to FIGS. 8A to 8C are views for explaining a first manufacturing method of the display device with a touch sensor according to the present embodiment. The first manufacturing method includes an array substrate forming step, a support substrate peeling step, and a touch sensor layer bonding step. Since it is well-known as a manufacturing method of an organic EL display device other than the touch sensor layer bonding step, detailed description is omitted here. First, the base substrate 70, the circuit layer 74, the OLED 6, and the sealing layer 106 are laminated on the support substrate 170 to form the array substrate 40 (FIG. 8A: array substrate forming step). The support substrate 170 is attached to the base material 70 via an adhesive or the like so that it can be easily peeled later. Next, the support substrate 170 is peeled from the base material 70 (FIG. 8B: support substrate peeling step). As a method for peeling the support substrate, methods such as thermal softening and photolysis can be applied. And the touch sensor layer containing the piezoelectric layer 5 and the electrode 9 for touch detection is affixed on the base material 70 from which the support substrate was peeled (FIG. 8C: touch sensor layer bonding process). Here, the base material 70 and the touch sensor layer (piezoelectric layer 5) are bonded together without any gap, and no conductive layer is disposed between the base material 70 and the touch sensor layer (piezoelectric layer 5).

  9A to 9D are diagrams for describing a second manufacturing method of the display device with a touch sensor 1 according to the present embodiment. The second manufacturing method includes a circuit layer forming step, a touch sensor layer forming step, an OLED forming step, and a sealing layer forming step. In the first manufacturing method, the touch sensor layer is bonded to the substrate 70, but in the second manufacturing method, the touch sensor layer is applied and formed. For example, the touch sensor layer can be formed by applying a roll-to-roll method. First, the circuit layer 74 is formed on the base material 70 (FIG. 9A: circuit layer formation process). Next, a touch sensor layer including the piezoelectric layer 5 and the touch detection electrode 9 is formed on the back surface side of the substrate 70 (FIG. 9B: touch sensor layer forming step). Here, the piezoelectric layer 5 and the sensor detection amount electrode 7 are formed by coating. And OLED6 is formed on a circuit layer (FIG. 9C: OLED formation process), and the sealing layer 106 which seals OLED6 is formed (FIG. 9D: sealing layer formation process).

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to embodiment mentioned above. For example, the configuration described in the above-described embodiment may be replaced by a configuration that has substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

DESCRIPTION OF SYMBOLS 1 Display apparatus with a touch sensor, 4 pixel array part, 5 piezoelectric layer, 6 OLED, 7 interlayer insulation film, 8 pixel circuit, 9 touch detection electrode, 10 lighting TFT, 11 touch sensor layer, 12 drive TFT, 14 capacitor, 20 scanning line drive circuit, 22 video line drive circuit, 24 drive power supply circuit, 26 control device, 28 scan signal line, 30 video signal line, 32 drive power supply line, 35 touch detection circuit, 36 switch, 40 array substrate, 60 facing Substrate, 70 base material, 74 circuit layer, 82 active layer, 84 gate insulating film, 86 gate electrode, 88 interlayer insulating film, 90 wiring layer, 90a source electrode, 90b drain electrode, 96 planarizing layer, 98 capacitive insulating layer, 100 Lower electrode, 102 Organic material layer, 104 Upper electrode, 106 Sealing layer, 111, 117 Conductor film, 112 Bank, 113 Metal Layer, 116 wiring, 118 insulating film, 140 cathode contact portion, 150 terminal portion, 160 organic layer, 161 first inorganic layer, 162 second inorganic layer, 170 supporting substrate.

Claims (7)

A plurality of pixels arranged in a matrix;
A plurality of video signal lines for supplying a video voltage to each of the pixels;
A plurality of scanning signal lines for supplying a scanning voltage to each of the pixels;
A substrate comprising:
A piezoelectric layer and a first sensor electrode that are arranged on the back side of the substrate and constitute a touch sensor that detects the presence or absence of pressing;
Have
The video signal line or the scanning signal line functions as a second sensor electrode of the touch sensor.
A display device with a touch sensor. The piezoelectric layer is disposed on the back side of the substrate,
A first sensor electrode is disposed on the back side of the piezoelectric layer;
The display device with a touch sensor according to claim 1. A conductive layer is not disposed between the substrate and the piezoelectric layer.
The display device with a touch sensor according to claim 2. During a period when no writing is performed on the pixel, pressure detection by the touch sensor is performed.
The display device with a touch sensor according to claim 1, wherein the display device has a touch sensor. During the period when the video signal line is not supplying the video voltage, pressure detection by the touch sensor is performed.
The display device with a touch sensor according to claim 4. During a period when the scanning signal line is not selected, press detection by the touch sensor is performed.
The display device with a touch sensor according to claim 4. It further includes a touch position detection sensor for detecting the touch position,
Pressure detection by the touch sensor is performed in a period in which the pixel is not written and in a period in which the touch position detection by the touch position detection sensor is not performed.
The display device with a touch sensor according to claim 4.

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