Touch panel

Abstract

To provide a touch panel with improved detection sensitivity.SOLUTION: A touch panel includes a stretchable array substrate, a detection electrode, and a resin plate that are stacked in order. The resin plate includes a detection surface that faces an opposite side to the detection electrode. On the detection surface, a concave plane is provided. When viewed from a stacking direction where the stretchable array substrate, the detection electrode, and the resin plate are stacked, the detection electrode and the concave plane are overlapped.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a touch panel.

Background Art

[0002] The stretchable array substrate shown in the following patent document is excellent in flexibility and stretchability. As a device to which the stretchable array substrate is applied, a touch panel capable of detecting proximity and contact of a finger or the like can be mentioned. The detection surface of such a touch panel is composed of a resin plate excellent in stretchability.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a touch panel, the resin plate serves as a dielectric disposed between the detection electrode and a finger. It is preferable that when the dielectric constant of the dielectric is high, the capacitance between the detection electrode and the finger increases and the detection sensitivity improves. However, the relative dielectric constant of resin materials is not high. Therefore, improvement of detection sensitivity is desired.

[0005] An object of the present invention is to provide a touch panel with improved detection sensitivity.

Means for Solving the Problems

[0006] A touch panel according to an aspect of the present disclosure includes a stretchable array substrate, a detection electrode, and a resin plate, which are laminated in this order. The resin plate has a detection surface facing the opposite side of the detection electrode. A concave surface is provided on the detection surface. When viewed from the lamination direction in which the stretchable array substrate, the detection electrode, and the resin plate are laminated, the detection electrode and the concave surface overlap. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram of a touch panel according to Embodiment 1, viewed from the detection surface. [Figure 2] Figure 2 is a schematic diagram illustrating the state in the self-capacitive type where the finger is not in contact with or near the sensor. [Figure 3] Figure 3 is a schematic diagram illustrating the state in which a finger is in contact with or in close proximity to a self-capacitive sensor. [Figure 4] Figure 4 is a schematic diagram showing the relationship between the coordinates of multiple individual detection regions, gate lines, gate connecting lines, and signal lines. [Figure 5] Figure 5 is a cross-sectional view of the touch panel of Embodiment 1, cut in the third direction, and more specifically, it schematically shows a cross-section cut along the VV line in Figure 6. [Figure 6] Figure 6 is a magnified plan view of a portion of the resin substrate placed in the detection area. [Figure 7] Figure 7 is a cross-sectional view of the body portion of Embodiment 1, cut in the stacking direction. [Figure 8] Figure 8 is a plan view of the array layer and functional layer that are stacked on the body. [Figure 9] Figure 9 is a cross-sectional view of the second hinge portion of Embodiment 1, cut in the stacking direction, and more specifically, a cross-sectional view taken along the line IX-IX in Figure 6. [Modes for carrying out the invention]

[0008] Embodiments for implementing this disclosure will be described in detail with reference to the drawings. The invention of this disclosure is not limited by the contents described in the following embodiments. Furthermore, the components described below include those that can be easily conceived by a person skilled in the art, and those that are substantially the same. Moreover, the components described below can be combined as appropriate. It should be noted that the disclosure is merely an example, and any modifications that can be easily conceived by a person skilled in the art while maintaining the spirit of the invention are naturally included within the scope of the present invention. In order to make the explanation clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present invention. Furthermore, in this specification and each drawing, components similar to those described above with respect to previously shown drawings are denoted by the same reference numerals, and detailed explanations may be omitted as appropriate.

[0009] Furthermore, in this specification and the claims, when describing a manner in which one structure is placed on top of another structure, unless otherwise specified, the term "on top of" includes both cases: when one structure is placed directly on top of another structure so as to be in contact with it, and when another structure is placed above another structure via yet another structure.

[0010] (Embodiment 1) Figure 1 is a schematic diagram of a touch panel according to Embodiment 1, viewed from the detection surface. As shown in Figure 1, the touch panel 1 is plate-shaped. One side of the touch panel 1 is a detection surface 1a that detects touch operations. Here, a touch operation is defined as "proximity to or contact of an object with the detection surface 1a". Also, when viewed from the direction normal to the detection surface 1a, the touch panel 1 has a rectangular shape.

[0011] The detection surface 1a of the touch panel 1 is divided into a detection area 2 capable of detecting touch operations and a frame-shaped peripheral area 3 surrounding the outside of the detection area 2. In Figure 1, a boundary line L is drawn to make the boundary between the detection area 2 and the peripheral area 3 easier to understand. Furthermore, the detection area 2 is divided into multiple individual detection areas 4. In other words, the detection area 2 is a collection of multiple individual detection areas 4. The presence or absence of a touch operation is detected in each of the individual detection areas 4.

[0012] Multiple individual detection regions 4 are arranged in a first direction Dx and a second direction Dy. The first direction Dx is parallel to the detection surface 1a. The second direction Dy is parallel to the detection surface 1a and intersects with the first direction Dx. In this embodiment, the first direction Dx is parallel to the short side 1b of the touch panel 1. The second direction Dy is parallel to the long side 1c of the touch panel 1. In other words, in this embodiment, the first direction Dx and the second direction Dy are orthogonal to each other. The normal direction (stacking direction) of the detection surface 1a is referred to as the third direction Dz.

[0013] Each individual detection region 4 is provided with a detection electrode 52 (see Figures 4 and 7, etc.) and a switching element Tr (see Figure 7). In each individual detection region 4, the presence or absence of a touch operation is detected using a self-capacitance method with the detection electrode 52. Next, the basic principle of self-capacitance touch detection will be explained.

[0014] Figure 2 is a schematic diagram representing a state in the self-capacitance method where the fingers are not in contact or close proximity. Figure 3 is a schematic diagram representing a state in the self-capacitance method where the fingers are in contact or close proximity. As shown in Figure 2, when the fingers are not in contact or close proximity, an AC square wave Sg of a predetermined frequency (for example, several kHz to several hundred kHz) is applied to the detection electrode 52. In this state, the detection electrode 52 has a predetermined capacitance C3 and outputs a current corresponding to the capacitance C3.

[0015] As shown in FIG. 3, when a finger contacts or approaches the detection electrode 52, the capacitance C4 between the finger and the detection electrode 52 is added to the capacitance C3 of the detection electrode 52. Therefore, when an AC rectangular wave Sg is applied to the detection electrode 52, the detection electrode 52 has a capacitance obtained by adding the capacitance C3 and the capacitance C4, and a current corresponding to this capacitance is output. Thus, a current fluctuation occurs between the case where there is a touch operation and the case where there is no touch operation. And by detecting the current fluctuation, the presence or absence of a touch operation on the detection electrode 52 is discriminated.

[0016] FIG. 4 is a schematic diagram showing the relationship between the coordinates of a plurality of individual detection regions, a gate line, a gate connection line, and a signal line. Next, a configuration for driving the switching element Tr (see FIG. 7) will be described. As shown in FIG. 4, the touch panel 1 includes a gate line 11, a gate connection line 12, a signal line 13, a connection portion 7 (see FIG. 1), a gate line driving circuit 8, and a signal line selection circuit 9 in order to drive each switching element Tr. Note that the source (source metal 38) of the switching element Tr is connected to the detection electrode 52 (see FIG. 7).

[0017] In FIG. 4, an 8×8 individual detection region 4 is extracted from among a plurality of individual detection regions 4. Regarding the 8×8 individual detection region 4, the first direction Dx is used as the X coordinate, and X(1), X(2),..., X(8) are sequentially assigned. Also, the second direction Dy is used as the Y coordinate, and Y(1), Y(2),..., Y(8) are sequentially assigned.

[0018] The gate line 11 is an electrical wiring extending in the first direction Dx. The gate line 11 is connected to each gate (gate metal 36) of the switching elements Tr arranged in the first direction Dx. That is, each switching element Tr arranged in the first direction Dx shares one gate line 11. A plurality of gate lines 11 are arranged in the second direction Dy and provided for each Y coordinate.

[0019] The gate connecting line 12 is an electrical wiring extending from the gate line drive circuit 8 in the second direction Dy. The gate connecting line 12 intersects the gate line 11 in the area that overlaps with the detection electrode 52 in a plan view. Multiple gate connecting lines 12 are arranged in the first direction Dx, with one provided for each X coordinate. The gate connecting line 12 is also connected to the gate line 11 by contact CP.

[0020] Contact CP is located in one of the multiple individual detection regions 4 where the coordinates are (X,Y)=(q,q). In other words, the contact CPs are arranged diagonally with respect to the first direction Dx and the second direction Dy. Specifically, for example, contact CP(1) is located in the individual detection region 4 where the coordinates are (X,Y)=(1,1). Contact CP(1) connects the gate communication line 12(1) at the X coordinate (1) and the gate line 11(1) at the Y coordinate (1). As a result, the signal from the gate line drive circuit 8 is input to the gate line 11(1) via the gate communication line 12(1) and contact CP(1).

[0021] Signal line 13 is an electrical wire extending from the signal line selection circuit 9 in the first direction Dx. Therefore, signal line 13 is parallel to the gate communication line 12. Signal line 13 is connected to the drain (drain metal 39) of each switching element Tr arranged in the second direction Dy. In other words, each switching element Tr arranged in the second direction Dy shares one signal line 13. In addition, multiple signal lines 13 are arranged in the second direction Dy, and one is provided for each Y coordinate.

[0022] As shown in Figure 1, the connection section 7, gate line drive circuit 8, and signal line selection circuit 9 are located in the peripheral region 3. The connection section 7 is for connecting to a drive IC (Integrated Circuit) located outside the touch panel 1. The drive IC may be mounted as COF (Chip On Film) on a flexible printed circuit board or rigid board connected to the connection section 7. Alternatively, the drive IC may be mounted as COG (Chip On Glass) in the peripheral region 3.

[0023] The peripheral region 3 is frame-shaped and has four sides. The connection part 7, gate line drive circuit 8, and signal line selection circuit 9 are all located together on one of the four sides of the peripheral region 3. Specifically, in this embodiment, the connection part 7, gate line drive circuit 8, and signal line selection circuit 9 are all located together on one side of the second direction Dy relative to the detection region 2. Therefore, when the touch panel 1 is stretched in the second direction Dy (see arrow A1 in Figure 1), no load is applied to the connection part 7, gate line drive circuit 8, and signal line selection circuit 9. In other words, the stretchability (ease of stretching) of the touch panel 1 in the second direction Dy is improved.

[0024] The gate line drive circuit 8 is a circuit that drives multiple gate lines 11 (see Figure 3) based on various control signals from the drive IC. The gate line drive circuit 8 simultaneously or sequentially selects multiple gate connecting lines 12 (multiple gate lines 11) and supplies gate drive signals to the selected gate lines 11. The signal line selection circuit 9 is a switch circuit that simultaneously or sequentially selects multiple signal lines 13. Based on the selection signals supplied from the drive IC, the signal line selection circuit 9 connects the selected signal lines 13 to the drive IC.

[0025] The method for detecting whether or not a touch operation has been performed involves sending a gate drive signal from the gate line drive circuit 8 to all switching element Trs via the gate line 11 and gate connecting line 12, causing the gates of the switching element Trs to open. Simultaneously, an AC square wave Sg is sent from the signal line selection circuit 9 to the switching element Trs via the signal line 13. As a result, the AC square wave Sg is sent to the detection electrode 52 via the switching element Trs. Then, a capacitance corresponding to whether or not a touch operation has been performed accumulates on the detection electrode 52. After the AC square wave Sg has been sent, the gate line drive circuit 8 temporarily stops supplying the gate drive signal to allow the capacitance accumulated on the detection electrode 52 to be retained.

[0026] Next, a gate drive signal is sent to, for example, the gate communication line 12(1) with an X coordinate of (1) among the multiple gate communication lines 12. This opens the gates of each switching element Tr connected to the gate line 11(1) with a Y coordinate of (1). The signal line selection circuit 9 sequentially selects the signal lines 13 to connect to the drive IC and outputs a current from the detection electrode 52 according to its capacitance. This allows the presence or absence of a touch operation to be detected in each individual detection area 4 located at a Y coordinate of (1).

[0027] Once detection of each individual detection area 4, where the Y coordinate is (1), is complete, a gate drive signal is sent to the gate connecting line 12(2) where the X coordinate is (2), and the Y coordinate to be detected for touch operation is changed sequentially. By repeating this method, the presence or absence of touch operation can be detected in the entire area of ​​the detection area 2. Next, the details of the structure of the touch panel 1 will be explained.

[0028] Figure 5 is a cross-sectional view of the touch panel of Embodiment 1 cut in a third direction, and more specifically, it schematically shows a cross-section cut along the VV line in Figure 6. As shown in Figure 5, the touch panel 1 has a first resin plate 20, a resin substrate 21, an array layer 30, a functional layer 50, and a second resin plate 60. The structure of the resin substrate 21 and the array layer 30 together corresponds to a stretchable array substrate. In this embodiment, which is the touch panel 1, the functional layer 50 includes a detection electrode 52.

[0029] In the following explanation, "upper side" or "above" refers to one direction in the third direction Dz, where the resin substrate 21 is positioned when viewed from the first resin plate 20. "Lower side" or "below" refers to the other direction in the third direction Dz, where the first resin plate 20 is positioned when viewed from the resin substrate 21. Additionally, the view from above may be referred to as a plan view.

[0030] The first resin plate 20 and the second resin plate 60 are manufactured from a resin material and are elastic and flexible. The first resin plate 20 is the base material of the touch panel 1. The second resin plate 60 has a detection surface 1a facing away from the functional layer 50. The first resin plate 20 and the second resin plate 60 have a rectangular shape in plan view. The resin base material 21, the array layer 30, and the functional layer 50 are sandwiched between the first resin plate 20 and the second resin plate 60.

[0031] The thickness of the second resin plate 60 in the third direction Dz is W1. This thickness W1 is usually 50 μm or more. In addition, the detection surface 1a is provided with a concave surface 61 that is recessed toward the functional layer 50. One example of a method for forming the concave surface 61 is ashing. In ashing, a resist film with openings is deposited on the detection surface 1a, and the detection surface 1a is irradiated with plasma. As a result, a part of the second resin plate is removed from the openings, and the concave surface 61 is formed. Therefore, the second resin plate 60 has a thin film portion 62 with a small thickness in the third direction Dz due to the presence of the concave surface 61, and a normal film portion 63 with a thickness of W1 in the third direction Dz. Details of the region of the second resin plate 60 where the thin film portion 62 is provided will be described later.

[0032] The resin substrate 21 is provided on the upper surface of the first resin plate 20. The resin substrate 21 has elasticity, flexibility, and insulating properties. The resin substrate 21 is made of a resin material such as polyimide.

[0033] Figure 6 is an enlarged plan view of a portion of the resin substrate arranged in the detection area. As shown in Figure 6, the resin substrate 21 has a body portion 22 arranged spaced apart from each other in a first direction Dx and a second direction Dy, and a hinge portion 23 connecting the body portions 22. The hinge portion 23 has a first hinge portion 24 extending in the first direction Dx and a second hinge portion 25 extending in the second direction Dy.

[0034] Switching elements Tr are stacked on the body portion 22, and detection electrodes 52 are further stacked on top of the switching elements Tr (see Figure 7). The body portion 22 has a rectangular shape in plan view and has four corners. The body portion 22 is arranged so that each of its four corners faces the first direction Dx and the second direction Dy. Each of the corners of the body portion 22 is connected to the hinge portion 23.

[0035] Electrical wiring is stacked on the hinge portion 23. Specifically, gate wires 11 are stacked on the first hinge portion 24. Gate connecting wires 12 and signal wires 13 are stacked on the second hinge portion 25. Furthermore, when the first hinge portion 24 is rotated 90°, it becomes identical in shape to the second hinge portion 25. The shape of the hinge portion 23 will be explained below using the first hinge portion 24 as an example.

[0036] The first hinge portion 24 has two linear portions 26 extending linearly in a first direction Dx, and a bent portion 27 that meanders when viewed from the stacking direction. The two linear portions 26 are spaced apart from each other in the first direction Dx. One end of each linear portion 26 is connected to a corner of the body portion 22. In other words, the linear portions 26 extend from the body portion 22.

[0037] The bent portion 27 has a first arc portion 27a that protrudes in one direction of the second direction Dy, and a second arc portion 27b that protrudes in the other direction of the second direction Dy. For example, when an elongation load in the first direction Dx is applied to the first hinge portion 24, the first arc portion 27a and the second arc portion 27b deform to expand in diameter.

[0038] The resin base material 21 is provided with multiple cutouts 29 surrounded by four hinge portions 23 arranged in a frame shape. The cutouts 29 are holes that penetrate the resin base material 21.

[0039] As shown in Figure 5, the array layer 30 and functional layer 50 are not laminated on the cutout portion 29. Instead, the cutout portion 29 is filled with the first resin plate 20. As a result, the touch panel 1 has low rigidity in the area overlapping with the cutout portion 29 and is stretchable. Also, when the touch panel 1 expands and contracts, the hinge portion 23 expands and contracts, and the expansion and contraction of the body portion 22 is kept to a minimum. Thus, damage to the functional element (detection electrode 52 in this embodiment) is suppressed. In this embodiment, the cutout portion 29 is filled with the first resin plate 20, but it may also be filled with the second resin plate 60, or with both the first resin plate 20 and the second resin plate 60. Next, the array layer 30, functional layer 50, and second resin plate 60 laminated on the body portion 22 will be described.

[0040] Figure 7 is a cross-sectional view of the body portion of Embodiment 1, cut in the stacking direction. As shown in Figure 7, the array layer 30 stacked on the body portion 22 includes an undercoat layer 31, a light-shielding metal 32, an undercoat layer 33, a semiconductor 34, a gate insulating film 35, a gate metal 36, an insulating film 37, a metal layer (source metal 38, drain metal 39), and an insulating film 40. The functional layer 50 stacked on the body portion 22 includes a planarization film 51, a detection electrode 52, and an insulating film 53. The undercoat layers 31, 33, gate insulating film 35, insulating film 37, planarization film 51, and insulating film 53 are insulating. The switching element Tr is a multi-gate type with two gate metals 36.

[0041] The undercoat layers 31 and 33 are, for example, coating layers formed from an epoxy resin composition, and may be inorganic films. The gate insulating film 35 and insulating film 37 are insulating layers formed from nitrides such as silicon nitride. The planarization film 51 is an organic planarization film formed from, for example, acrylic, polyimide, or polyacrylamide.

[0042] The light-shielding metal 32 is positioned on the resin substrate 21 side relative to the semiconductor 34. This light-shielding metal 32 is a layer that suppresses light incident on the first resin plate 20 from reaching the semiconductor 34.

[0043] Figure 8 is a plan view of the array layer and functional layer stacked in the body. In Figure 8, the source (source metal 38) and drain (drain metal 39) of the switching element Tr overlap with the semiconductor 34 and the switching element Tr. As shown in Figure 7, the semiconductor 34 is connected to the source metal 38 and the drain metal 39, respectively. The two gate metals 36 are positioned between the source metal 38 and the drain metal 39 and function as gates for the semiconductor 34. A gate insulating film 35 is interposed between the semiconductor 34 and the gate metals 36.

[0044] The detection electrode 52 is made of a transparent conductive material such as ITO (Indium Tin Oxide). The detection electrode 52 is connected to the source (source metal 38) of the switching element Tr.

[0045] Furthermore, the detection electrode 52 has a thin film portion 62 of the second resin plate 60 laminated on it. In other words, when viewed from the lamination direction, the concave surface 61, the thin film portion 62, the detection electrode 52, and the body portion 22 overlap. The thickness W2 of the thin film portion 62 needs to be at least 5 μm from the viewpoint of rigidity and strength.

[0046] Furthermore, contact CPs are provided in the array layer 30 of the individual detection region 4 where the coordinates are (X,Y)=(q,q). Next, the layout of the array layer 30 and functional layer 50 stacked on the body will be described in plan view.

[0047] As shown in Figure 8, the switching element Tr is positioned in the center of the body portion 22. The two gate metals 36 are separated in the second direction Dy. The array layer 30 is provided with a first bypass wiring 43. The first bypass wiring 43 is a C-shaped wiring in plan view and extends in the second direction Dy while bypassing the switching element Tr.

[0048] The gate connecting line 12 positioned on one side of the second direction Dy (the lower side in Figure 8) relative to the body section 22 is connected to one end of the first bypass wiring 43 in the second direction Dy (the lower end in Figure 8). Similarly, the gate connecting line 12 positioned on the other side of the second direction Dy (the upper side in Figure 8) relative to the body section 22 is connected to the other end of the first bypass wiring 43 in the second direction Dy (the upper end in Figure 8). As a result, the gate connecting lines 12 stacked on each hinge section 23 (second hinge section 25) are continuous in the second direction Dy.

[0049] As shown in Figure 7, the gate line 11 located on one side of the first direction Dx (left side in Figure 8) relative to the body section 22 is connected to contact CP via a contact hole. This contact CP is located on the same level as the first bypass wiring 43 and is connected to the first bypass wiring 43. Therefore, the gate line 11 located on one side of the first direction Dx (left side in Figure 8) relative to the body section 22 is connected to the gate connecting line 12. In addition, the first bypass wiring 43 is connected to the connecting line 42 on the lower level via a contact hole.

[0050] As shown in Figure 8, the connecting wire 42 extends in the second direction Dy. The other end of the connecting wire 42 in the first direction Dx (the right end in Figure 8) is connected to the second bypass wiring 46 by a contact hole. The second bypass wiring 46 (see the dotted area in Figure 8) extends through the center of the body portion 22 in the first direction X1. The second bypass wiring 46 is also divided into the second direction Dy at the center of the first direction Dx and overlaps with the two gate metals 36 in a plan view. The second bypass wiring 46 is then connected to each of the two gate metals 36 by a contact hole.

[0051] Furthermore, the other end (right end in Figure 8) of the second bypass wiring 46 in the first direction Dx is connected to the connecting wire 41 via a contact hole. The connecting wire 41 is then connected to the gate wire 11 located on the other side (right side in Figure 8) of the first direction Dx relative to the body portion 22. Thus, the gate wires 11 stacked on each hinge portion 23 (first hinge portion 24) are continuously connected in the first direction Dx.

[0052] A semiconductor 34 extends in the second direction Dy beneath the two gate metals 36. One end of the semiconductor 34 in the second direction Dy (the lower end in Figure 8) is connected to the detection electrode 52 via a source metal 38.

[0053] The other end (upper end in Figure 8) of the second direction Dy of the semiconductor 34 is connected to the drain metal 39. The drain metal 39 is connected to the third bypass wiring 44. This third bypass wiring 44 is a C-shaped wiring in plan view that extends around the switching element Tr. One end (lower end in Figure 8) of the second direction Dy of this third bypass wiring 44 is connected to the signal line 13 located on one side (lower side in Figure 8) of the second direction Dy relative to the body portion 22. On the other hand, the other end (upper side in Figure 8) of the second direction Dy of the third bypass wiring 44 is connected to the signal line 13 located on the other side (upper side in Figure 8) of the second direction Dy relative to the body portion 22. Therefore, the signal line 13 stacked on each hinge portion 23 (second hinge portion 25) is continuous with the second direction Dy by the third bypass wiring 44.

[0054] Next, the laminated structure of the hinge portion will be described. Figure 9 is a cross-sectional view of the second hinge portion of Embodiment 1, cut in the lamination direction, and more specifically, a cross-sectional view taken along the line IX-IX in Figure 6. As shown in Figure 9, the array layer 30 laminated on the second hinge portion 25 includes an undercoat layer 31, an undercoat layer 33, a semiconductor 34, a gate communication line 12, an insulating film 37, a signal line 13, and an insulating film 40. The functional layer 50 laminated on the second hinge portion 25 consists only of a planarization film 51.

[0055] Although not specifically shown in the diagram, the array layer 30 to which the first hinge portion 24 is stacked includes an undercoat layer 31, an undercoat layer 33, a semiconductor 34, a gate line 11, an insulating film 37, an insulating film 40, and a planarization film 51. The gate line 11, gate connecting line 12, and signal line 13 are formed of Ta (tantalum).

[0056] Furthermore, the second resin plate 60 laminated on the hinge portion 23 is normally a film portion 63. Therefore, a resin plate with a greater thickness than the thin film portion 62 laminated on the detection electrode 52 is laminated.

[0057] Next, the effects of the touch panel 1 of Embodiment 1 will be described. The following formula (1) is a formula that shows the detection sensitivity of the touch panel 1 of Embodiment 1.

[0058]

number

[0059] C in equation (1) f ε is the capacitance generated between the finger and the detection electrode. ε0 is the permittivity of vacuum and is a constant. γ is the dielectric constant of the dielectric (second resin plate). A is the effective area of ​​the detection electrode. d is the distance between the electrodes. Here, the distance between the electrodes, d, is the distance from the detection electrode to the detection surface 1a.

[0060] According to the touch panel 1 of Embodiment 1, a thin film portion 62 is arranged as a dielectric, and the value of d (distance between electrodes) becomes small. In other words, the capacitance C when a touch operation is performed f The value of increases, improving detection sensitivity. In addition, in the second resin plate 60, a normal film portion 63 is arranged in the area that does not overlap with the detection electrode. As a result, the necessary rigidity and strength of the second resin plate are ensured, and a decrease in the durability of the touch panel 1 is avoided.

[0061] The touch panel of Embodiment 1 has been described above, but this disclosure is not limited to those shown in the embodiments. [Explanation of Symbols]

[0062] 1 Touch panel 2 Detection area 3. Peripheral area 4 Individual detection area 7 Connection part 8 Gate Line Drive Circuit 9. Signal line selection circuit 11 Gate Line Gate 12 connecting line 13 signal lines 20 First resin plate 21 Resin base material 22 Body section 23 Hinge section 24. First hinge section 25 Second hinge section 26 Straight section 27. Bending section 27a First arc section 27b Second circular arc 29. Weight-reducing section 30 array layers 50 Functional Layers 52 detection electrodes 60. Second resin plate (resin plate) 61 Concave 62 Thin film section 63 Normal membrane part 70 Resin frame section CP Contact Tr switching element

Claims

1. The array comprises a stretchable array substrate, a detection electrode, and a resin plate, which are stacked in order. The resin plate has a detection surface facing away from the detection electrode, The detection surface is provided with a concave surface. When viewed from the stacking direction in which the stretchable array substrate, the detection electrode, and the resin plate are stacked, the detection electrode and the concave surface overlap. Touch panel.

2. The stretchable array substrate has a resin substrate, The aforementioned resin substrate is Multiple body parts arranged at a distance from each other, Multiple hinge parts connecting the aforementioned body parts, It has, Viewed from the aforementioned stacking direction, the detection electrode and the concave surface overlap the body portion. The touch panel according to claim 1.

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