Touch display device

Abstract

A touch display device capable of preventing degradation of touch performance is disclosed. The touch display device includes: a touch sensing electrode and a touch driving electrode, which are arranged on a packaging unit configured to package a light-emitting element, the touch sensing electrode and the touch driving electrode are configured to form a first mutual capacitance; and a first compensation electrode and a second compensation electrode, the first compensation electrode and the second compensation electrode are configured to be arranged opposite to each other in a non-effective display area of ​​a substrate, the first compensation electrode and the second compensation electrode are configured to form a second mutual capacitance, whereby the capacitance values ​​of all mutual capacitances are increased, and thus degradation of touch performance can be prevented.

Description

[0001] This application claims the benefit of Korean Patent Application No. P2019-0098073, filed on August 12, 2019, which is hereby incorporated by reference as if fully set forth herein. Technical Field

[0002] The present invention relates to a display device, and in particular to a touch display device capable of preventing degradation of touch performance. Background Art

[0003] A touch screen is an input device that allows a user to input a command by selecting one of the instructions displayed on the screen (e.g., instructions of a display device) using the user's hand or an object. That is, the touch screen converts a contact position where the user's hand or object directly contacts the touch screen into an electrical signal to receive the instruction selected at the contact position as an input signal. The use of touch screens has increased because the touch screen can replace a separate input device such as a keyboard or a mouse connected to a display device for operation.

[0004] The touch screen includes a plurality of touch sensing electrodes, a plurality of touch driving electrodes, and a plurality of touch wires disposed between the plurality of touch sensing electrodes and the plurality of touch driving electrodes. In this case, the distance between the touch sensing electrodes and the touch driving electrodes increases due to the touch wires, thereby reducing the capacitance value of the mutual capacitance formed between the touch sensing electrodes and the touch driving electrodes, and thus the touch performance deteriorates. In addition, in the case where the capacitance value of the mutual capacitance is lower than the capacitance value of the self capacitance C_finger formed between the touch sensing electrodes and the touch driving electrodes and an indicator such as a user's finger or a pen, a malfunction occurs. Summary of the invention

[0005] Accordingly, the present invention is directed to a touch display device that substantially obviates one or more problems due to limitations and disadvantages of the related art.

[0006] An object of the present invention is to provide a touch display device capable of preventing degradation of touch performance.

[0007] Other advantages, purposes and features of the present invention will be partially set forth in the following description, and will become partially apparent to those skilled in the art after studying the following description, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be realized and obtained by the structures particularly pointed out in the written description and claims thereof, as well as in the accompanying drawings.

[0008] To achieve these objectives and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, a touch display device includes: touch sensing electrodes and touch driving electrodes arranged on a packaging unit configured to encapsulate a light-emitting element, the touch sensing electrodes and the touch driving electrodes being configured to form a first mutual capacitance, and a first compensation electrode and a second compensation electrode, the first compensation electrode and the second compensation electrode being arranged opposite to each other in a non-effective display area of ​​a substrate, the first compensation electrode and the second compensation electrode being configured to form a second mutual capacitance, thereby increasing the capacitance value of all mutual capacitances, and thus preventing degradation of touch performance.

[0009] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings, which are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this application, illustrate embodiments of the present invention and together with the description serve to explain the principle of the present invention. In the drawings:

[0011] Figure 1 is a plan view showing a touch display device according to the present invention;

[0012] Figure 2 is along Figure 1 A cross-sectional view of the display device taken along line II';

[0013] Figure 3 yes Figure 1 An enlarged plan view of area A;

[0014] Figure 4 is a diagram showing capacitance values ​​of all mutual capacitances of each touch sensor of a touch display device according to the present invention;

[0015] Figure 5 yes Figure 1 An enlarged plan view of a first embodiment of region B;

[0016] Figure 6 is along Figure 5 A cross-sectional view of the display device taken along line II1-II1';

[0017] Figure 7 It is shown Figure 5 A plan view of another embodiment of the first compensation electrode shown;

[0018] Figure 8 is along Figure 5 A cross-sectional view of the touch display device taken along line II2-II2';

[0019] Fig. 9 yes Figure 1 An enlarged plan view of a second embodiment of region B;

[0020] Fig.10 is shown along Fig. 9 A cross-sectional view of the first embodiment of the touch display device taken along line III1-III1';

[0021] Fig.11 is shown along Fig. 9 A cross-sectional view of the first embodiment of the touch display device taken along line III2-III2';

[0022] Fig.12 is shown along Fig. 9 A cross-sectional view of the second embodiment of the touch display device taken along line III1-III1';

[0023] Fig.13 is shown along Fig. 9 A cross-sectional view of the second embodiment of the touch display device taken along line III2-III2';

[0024] Fig.14 yes Figure 1 An enlarged plan view of a third embodiment of region B;

[0025] Fig.15 is along Fig.14 A cross-sectional view of the display device taken along line IV1-IV1';

[0026] Fig.16 is along Fig.14 A cross-sectional view of the display device taken along line IV2-IV2';

[0027] Fig.17 It is shown Figure 1 A plan view of another embodiment of a touch pad is shown; and

[0028] Figures 18A to 18C It is shown Figure 1 A plan view of another embodiment of the second mutual capacitance is shown. DETAILED DESCRIPTION

[0029] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0030] Figure 1 is a plan view showing a touch display device according to the present invention, Figure 2 yes Figure 1 A cross-sectional view of a touch display device is shown.

[0031] Figure 1 and Figure 2 The touch display device shown implements a touch sensing function and a display function. That is, the touch display device displays an image through sub-pixels arranged in a matrix and implements a touch sensing function using a plurality of touch electrodes.

[0032] To this end, the touch display device includes a plurality of sub-pixels arranged in a matrix on a substrate 101 , an encapsulation unit 140 disposed on the plurality of sub-pixels, and touch electrodes Tx and Rx disposed on the encapsulation unit 140 .

[0033] The substrate 101 is made of a flexible plastic material or glass material so as to be foldable or bendable. For example, the substrate 101 can be made of polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polyether sulfone (PES), polyacrylate (PAR), polysulfone (PSF) or cyclic olefin copolymer (COC).

[0034] like Figure 1 and Figure 2 As shown, each of the plurality of sub-pixels includes a pixel driving circuit and a light emitting element 120 connected to the pixel driving circuit, wherein the pixel driving circuit includes a driving thin film transistor 130 and a storage capacitor 100 .

[0035] In response to a data signal supplied to a gate of the driving thin film transistor 130 included in the pixel driving circuit, the driving thin film transistor 130 controls current supplied from a high voltage (VDD) power line to the light emitting element 120 to adjust the amount of light emitted by the light emitting element 120 .

[0036] like Figure 2 As shown, the driving thin film transistor 130 includes: a semiconductor layer 134, which is disposed on the buffer layer 112; a gate electrode 132, which overlaps the semiconductor layer 134, in a state where the gate dielectric film 114 is interposed therebetween; and a source electrode 136 and a drain electrode 138, which are formed on the interlayer dielectric films 116 and 118 so as to contact the semiconductor layer 134. Here, the semiconductor layer 134 is made of at least one of an amorphous semiconductor material, a polycrystalline semiconductor material, or an oxide semiconductor material.

[0037] The storage capacitor 100 includes at least two of the first to fourth storage electrodes 102, 104, 106, and 108. The first storage electrode 102 is formed on the buffer layer 112 and is made of the same material as the semiconductor layer 134. The second storage electrode 104 is formed on the gate dielectric film 114 as a gate metal layer made of the same material as the gate 132. The third storage electrode 106 is formed on the lower interlayer dielectric film 116 as a storage metal layer. The fourth storage electrode 108 is formed on the upper interlayer dielectric film 118 as a source and drain metal layer made of the same material as the source 136 and the drain 138.

[0038] The light emitting element 120 includes an anode 122 , at least one light emitting stack 124 formed on the anode 122 , and a cathode 126 formed on the light emitting stack 124 .

[0039] The anode 122 is electrically connected to the drain electrode 138 of the driving thin film transistor 130 , which is exposed through a pixel contact hole formed through the interlayer dielectric films 116 and 118 and the pixel planarization layer 166 .

[0040] At least one light-emitting stack 124 is formed in a light-emitting region defined by a bank 128 on the anode 122. The at least one light-emitting stack 124 is formed by stacking a hole-related layer, an organic light-emitting layer, and an electron-related layer on the anode 122 in this order or in the reverse order. In addition, the light-emitting stack 124 may include a first light-emitting stack and a second light-emitting stack, which are opposite to each other in a state where a charge generation layer is disposed between them. In this case, the organic light-emitting layer of one of the first and second light-emitting stacks generates blue light, and the organic light-emitting layer of the other of the first and second light-emitting stacks generates yellow-green light. Therefore, white light is generated by the first and second light-emitting stacks. The white light generated by the light-emitting stack 124 is incident on a color filter located above or below the light-emitting stack 124 to realize a color image. Alternatively, each light-emitting stack 124 can generate color light corresponding to each sub-pixel in order to realize a color image without the need for a separate color filter. That is, the light emitting stack 124 of the red sub-pixel can generate red light, the light emitting stack 124 of the green sub-pixel can generate green light, and the light emitting stack 124 of the blue sub-pixel can generate blue light.

[0041] The cathode 126 is formed to be opposite to the anode 122, in a state where the light emitting stack 124 is disposed therebetween. The cathode 126 is connected to a low voltage (VSS) power supply line via a first auxiliary electrode 162 and a second auxiliary electrode 164. The first auxiliary electrode 162 is made of the same material as the source electrode 136 and the drain electrode 138, and is disposed on the upper interlayer dielectric film 118. The first auxiliary electrode 162 is disposed on the upper interlayer dielectric film 118 so as to overlap with at least one of the plurality of barriers 110.

[0042] The second auxiliary electrode 164 is made of the same material as the anode 122 and is disposed on the pixel planarization layer 166. The second auxiliary electrode 164 is connected to the first auxiliary electrode 162, which is exposed between the pixel planarization layer 166 located at the outermost side and the first sub-barrier layer 110a of the second barrier 1102. In this case, the second auxiliary electrode 164 is formed to extend along the upper surface and the side surface of the pixel planarization layer 166 disposed at the outermost side, the upper surface of the first auxiliary electrode 162, and the side surface of the first sub-barrier layer 110a of the second barrier 1102. In addition, the second auxiliary electrode 164 exposed between the bank portions 128 is connected to the cathode 126 on the pixel planarization layer 166.

[0043] The encapsulation unit 140 prevents external moisture or oxygen from penetrating into the light emitting element 120, to which the light emitting element 120 has low resistance. To this end, the encapsulation unit 140 includes at least one inorganic encapsulation layer 142 and at least one organic encapsulation layer 144. In the present invention, the encapsulation unit 140 will be described by way of example, having a structure in which a first inorganic encapsulation layer 142, an organic encapsulation layer 144, and a second inorganic encapsulation layer 146 are sequentially stacked.

[0044] The first inorganic encapsulating layer 142 is formed on the substrate 101 on which the cathode 126 is formed. The second inorganic encapsulating layer 146 is formed on the substrate 101 on which the organic encapsulating layer 144 is formed, and is formed to surround the upper, lower and side surfaces of the organic encapsulating layer 144 and the first inorganic encapsulating layer 142.

[0045] The first inorganic encapsulation layer 142 and the second inorganic encapsulation layer 146 minimize or prevent external moisture or oxygen from penetrating into the light-emitting stack 124. Each of the first inorganic encapsulation layer 142 and the second inorganic encapsulation layer 146 is made of an inorganic dielectric material that can be deposited at low temperatures, such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON) or aluminum oxide (Al2O3). Therefore, each of the first inorganic encapsulation layer 142 and the second inorganic encapsulation layer 146 is deposited in a low-temperature atmosphere, thereby, when each of the first inorganic encapsulation layer 142 and the second inorganic encapsulation layer 146 is deposited, damage to the light-emitting stack 124 (which has low resistance to high-temperature atmosphere) can be prevented.

[0046] The organic encapsulation layer 144 reduces the stress between the layers caused by the bending of the organic light-emitting display device and improves the planarization. The organic encapsulation layer 144 is formed on the substrate 101 on which the first inorganic encapsulation layer 142 is formed, and the organic encapsulation layer 144 is made of a non-photosensitive organic dielectric material, such as a particle cover layer (PCL), an acrylic resin, an epoxy resin, a polyimide, a polyethylene, or a silicon oxide carbide (SiOC), or is made of a photosensitive organic dielectric material, such as a photosensitive acrylic resin. The organic encapsulation layer 144 is disposed in the effective display area AA except for the non-effective display area NA. To this end, at least one barrier 110 is provided to prevent the organic encapsulation layer 144 from diffusing to the non-effective display area NA. At least one barrier 110 is made of the same material as at least one of the pixel planarization layer 166, the embankment 128, or the spacer (not shown). For example, in the case where three barriers 110 are provided, a first barrier 1101 closest to the effective display area AA is formed by sequentially stacking a second sub-barrier 110b made of the same material as the bank 128 and a third sub-barrier 110c made of the same material as the spacer. A third barrier 1103 farthest from the effective display area AA is formed by sequentially stacking a first sub-barrier layer 110a made of the same material as the pixel planarization layer 166 and a second sub-barrier 110b made of the same material as the bank 128. A second barrier 1102 is provided between the first barrier 1101 and the third barrier 1103, and is formed by sequentially stacking a first sub-barrier layer 110a made of the same material as the pixel planarization layer 166, a second sub-barrier 110b made of the same material as the bank 128, and a third sub-barrier 110c made of the same material as the spacer. Meanwhile, since the organic encapsulation layer 144 is disposed on at least a portion of the first barrier 1101 that is most adjacent to the effective display area AA, the organic encapsulation layer 144 compensates for the step between the pixel planarization layer 166 and each of the bank 128 and the bank barrier 110. In addition, the region in which the organic encapsulation layer 144 is formed may be defined only by the second barrier 1102 and the third barrier 1103, rather than by the first barrier 1101 (which has the lowest height among the first barrier 1101, the second barrier 1102, and the third barrier 1103).

[0047] A plurality of touch drive electrodes Tx, a plurality of touch sensing electrodes Rx, a touch drive line TL, and a touch sensing line RL are provided on the packaging unit 140. The touch drive electrodes Tx, the touch sensing electrodes Rx, the touch drive lines TL, and the touch sensing lines RL are provided as a single layer without a touch dielectric film. Therefore, the touch drive electrodes Tx, the touch sensing electrodes Rx, the touch drive lines TL, and the touch sensing lines RL can be formed by a single mask process, thereby simplifying the process and reducing the thickness of the touch display device having the touch drive electrodes Tx, the touch sensing electrodes Rx, the touch drive lines TL, and the touch sensing lines RL.

[0048] A touch sensing method based on mutual capacitance is used to sense a user touch using a plurality of touch drive electrodes Tx and a plurality of touch sensing electrodes Rx. That is, when a touch drive signal for touch detection is provided to the touch drive electrode Tx, the capacitance between the touch drive electrode Tx and the touch sensing electrode Rx is changed according to whether there is a user touch, and based on the change in capacitance, a sensing signal sent from the touch sensing electrode Rx to the touch drive circuit is used to determine whether there is a touch and / or touch coordinates.

[0049] Considering the user touch area, each of the plurality of touch driving electrodes Tx and the plurality of touch sensing electrodes Rx is formed to have a size corresponding to a plurality of sub-pixels. For example, one touch driving electrode Tx has a size several to hundreds of times larger than one sub-pixel.

[0050] Each of the touch driving electrode Tx and the touch sensing electrode Rx is formed to have a single-layer structure or a multi-layer structure using a touch metal layer such as Ta, Ti, Cu, or Mo exhibiting high corrosion resistance, acid resistance, and conductivity. Figure 3 As shown, each of the touch drive electrode Tx and the touch sensing electrode Rx using an opaque touch metal layer is formed into a mesh, wherein the touch electrode does not overlap with the light emitting area of ​​each sub-pixel SP and overlaps with the bank 128, thereby preventing the reduction of the aperture ratio and the transmittance. The mesh touch drive electrode Tx and the touch sensing electrode Rx exhibit higher conductivity than the transparent conductive film, thereby the touch drive electrode Tx and the touch sensing electrode Rx can be formed as a low resistance electrode. Therefore, the resistance and capacitance of each of the touch drive electrode Tx and the touch sensing electrode Rx are reduced, thereby reducing the RC delay, thereby improving the touch sensitivity.

[0051] Each of the plurality of touch driving electrodes Tx and the plurality of touch sensing electrodes Rx includes at least two electrodes arranged in one direction. In the present invention, a structure in which each of the plurality of touch driving electrodes Tx and the plurality of touch sensing electrodes Rx includes four electrodes will be described by way of example.

[0052] Each touch sensing electrode Rx is arranged to correspond to four touch driving electrodes Tx. For example, the first touch sensing electrode Rx is arranged to correspond to the first to fourth touch driving electrodes Tx1, Tx2, Tx3 and Tx4. To this end, the length of each of the first to fourth touch sensing electrodes Rx1, Rx2, Rx3 and Rx4 is greater than the length of the corresponding one of the first to fourth touch driving electrodes Tx1, Tx2, Tx3 and Tx4.

[0053] Each of the plurality of touch driving electrodes Tx is electrically connected to a corresponding one of the touch driving lines TL, and each of the plurality of touch sensing electrodes Rx is electrically connected to a corresponding one of the touch sensing lines RL.

[0054] The touch line 152 including the touch drive line TL and the touch sensing line RL is arranged to overlap with the bank 128, thereby preventing the degradation of the aperture ratio due to the touch line 152. In addition, the touch line 152 is arranged on the upper surface or the side surface of the second inorganic encapsulation layer 146, which is the uppermost layer of the encapsulation unit 140. Therefore, even when external oxygen or moisture is introduced through the touch line 152, the oxygen or moisture is blocked by the encapsulation unit 140, thereby protecting the light-emitting stack 124 from the influence of oxygen or moisture. For example, the touch line 152 can be arranged on a touch buffer film to contact the touch buffer film, which is arranged on the second inorganic encapsulation layer 146, or the touch line 152 can be arranged on the second inorganic encapsulation layer 146 to contact the second inorganic encapsulation layer 146 without a separate touch buffer film.

[0055] Each touch line 152 is electrically connected to a touch pad 170 provided in the pad area PA. The touch pad 170 is formed to be exposed by the touch passivation film 168, and is thus connected to a signal transmission film on which a touch driving circuit (not shown) is mounted. Here, the touch passivation film 168 is formed to cover the touch electrodes Tx and Rx, thereby preventing the touch electrodes Tx and Rx from being corroded by external moisture. The touch passivation film 168 is made of an organic insulating material such as epoxy resin or acrylic, and is formed in the shape of a thin film or film, or is made of an inorganic insulating material such as SiNx or SiOx.

[0056] In addition, if Figure 1As shown, the touch sensing electrode Rx and the touch driving electrode Tx of the present invention are opposite to each other in a state where the touch lines RL and TL are arranged therebetween. Therefore, the touch sensing electrode Rx and the touch driving electrode Tx do not overlap each other in the vertical direction, so that the capacitance value of the first mutual capacitance Ca in the horizontal direction is low. In particular, the capacitance value of the first mutual capacitance Ca in the horizontal direction is lower than the capacitance value of the self capacitance C_finger formed between each touch electrode Tx and Rx and an indicator such as a user's finger or pen, thereby causing a malfunction in touch sensing.

[0057] In addition, the capacitance value of the mutual capacitance changes according to the position of the touch sensing electrode Rx. Figure 4 As shown, the area where the second touch sensing line RL2 electrically connected to the second touch sensing electrode Rx2 and the first touch driving line TL1 electrically connected to the first touch driving electrode Tx1 face each other is larger than the area where the fourth touch sensing line RL4 electrically connected to the fourth touch sensing electrode Rx4 and the first touch driving line TL1 electrically connected to the first touch driving electrode Tx1 face each other. In this case, a plurality of first mutual capacitances Ca are formed between the second touch sensing line RL2 and the first touch driving line TL1, and a single mutual capacitance Ca is formed between the fourth touch sensing line RL4 and the first touch driving line TL1. Therefore, in the present invention, a compensation circuit is included, which includes a second mutual capacitance Cb, and the second mutual capacitance Cb is configured to increase the capacitance values ​​of all mutual capacitances Cm according to the position of the touch sensing electrode Rx and compensate for the deviation of the capacitance value of the first mutual capacitance Ca. In the example Figure 4 In the embodiment shown, Ca <Cb,Cm=Ca+Cb。

[0058] Figure 5 and Figure 6 1 and 2 are a plan view and a cross-sectional view showing a non-effective display area in which a second mutual capacitance of the touch display device according to the first embodiment of the present invention is provided.

[0059] like Figure 5 and Figure 6 As shown, the touch sensing line RL, the touch driving line TL, the connecting line 182, the touch pad 170 and the second mutual capacitor Cb are disposed in the non-effective display area NA.

[0060] The touch line 152 including the touch sensing line RL and the touch driving line TL is disposed in the non-active display area NA including the first connection area LA1, the bending area BA, and the second connection area LA2.

[0061] The first connection area LA1 is disposed between the active display area AA and the bending area BA.

[0062] The second connection area LA2 is disposed between the bending area BA and the pad area PA. The illumination inspection transistor is disposed in the second connection area LA2.

[0063] The bending area BA is an area in which the substrate 101 is bendable or foldable, and corresponds to an area that is bent so as to position the non-effective display area NA that does not perform a display function at the rear of the effective display area AA. In the entire screen of the display device, the area occupied by the effective display area AA is maximized by the bending area BA, and the area corresponding to the non-effective display area NA is minimized. The bending area BA may be provided in at least one of the upper side, the lower side, the left side, or the right side of the non-effective display area NA.

[0064] The signal lines including the touch line 152 disposed in the bending area BA are arranged in a zigzag manner or a plurality of hollow polygonal structures, a plurality of hollow circular structures, or a combination thereof, connected to each other and arranged linearly. Therefore, even when a bending force is applied to the bending area BA, damage to the signal lines including the touch line 152 can be minimized. In addition, as Figure 6 As shown, the crack prevention layer 148 is disposed in the bending area BA.

[0065] The crack prevention layer 148 is arranged to cover the signal line passing through the border area BA. For example, the crack prevention layer 148 is arranged on the second touch line 152b, and the second touch line 152b is arranged in the border area BA on the upper interlayer dielectric film 118. The crack prevention layer 148 is made of an organic film material that exhibits higher strain and impact resistance than an inorganic film. For example, since the crack prevention layer 148 is formed together with at least one of the pixel planarization layer 166 or the embankment 128, the crack prevention layer 148 is made of the same material as at least one of the pixel planarization layer 166 or the embankment 128, and is arranged in the same plane as at least one of the pixel planarization layer 166 or the embankment 128. Since the crack prevention layer 148 made of an organic film material has a higher strain than an inorganic film material, the bending stress generated when the substrate 101 is bent is reduced. Therefore, the crack prevention layer 148 can prevent cracks from forming in the bending area BA, thereby preventing the cracks from extending to the effective display area AA.

[0066] Each touch line 152 including the touch sensing line RL and the touch driving line TL arranged in the bending area BA and the first connection area LA1 and the second connection area LA2 includes first to third touch lines 152a, 152b and 152c. The first touch line 152a extends from each of the touch sensing electrode Rx and the touch driving electrode Tx, and is arranged in the effective display area AA and the first connection area LA1. The first touch line 152a is made of the same material as each of the touch sensing electrode Rx and the touch driving electrode Tx, and is formed by the same mask process as each of the touch sensing electrode Rx and the touch driving electrode Tx. The first line 152a is formed to have a single-layer structure or a multi-layer structure using a touch metal layer having high corrosion resistance, acid resistance and conductivity such as Al, Ta, Ti, Cu or Mo. For example, the first touch line 152a is formed of Ti / Al / Ti.

[0067] The second touch line 152b is electrically connected to the first touch line 152a exposed by the first contact hole 156a formed through the crack prevention layer 148. The second touch line 152b is disposed in the bending area BA and is formed using the same material as the source electrode 136 and the drain electrode 138 through the same mask process as the source electrode 136 and the drain electrode 138. In particular, since the second touch line 152b is formed to be longer than the first touch line 152a and the third touch line 152c, as shown in FIG. Figure 3 As shown, the second touch line 152b is made of a metal having lower resistance than the first touch line 152a and the third touch line 152c.

[0068] The third touch line 152c is electrically connected to the second touch line 152b exposed by the second contact hole 156b formed through the crack prevention layer 148. The third touch line 152c is disposed in the second connection area LA2. The third touch line 152c is formed by the same mask process as each of the touch sensing electrode Rx and the touch driving electrode Tx using the same material as each of the touch sensing electrode Rx and the touch driving electrode Tx.

[0069] The touch line 152 including the first to third touch lines 152a, 152b, and 152c is electrically connected to a touch pad 170 disposed in the pad area PA. The touch pad 170 includes a first touch pad electrode 172 and a second touch pad electrode 174.

[0070] The first touch pad electrode 172 is made of the same material as the second touch wire 152 b , and is disposed on the upper interlayer dielectric film 118 .

[0071] Since the second touch pad electrode 174 extends from the third touch wire 152c, the second touch pad electrode 174 is made of the same material as the third touch wire 152c and is disposed on the first touch pad electrode 172. The second touch pad electrode 174 is electrically connected to the first touch pad electrode 172 without a separate contact hole.

[0072] The connection line 182 and the second mutual capacitance Cb are disposed in the second connection area LA2 between the pad area PA in which the touch pad 170 is disposed and the bending area BA.

[0073] The connection line 182 extends in the second direction so as to intersect the touch driving line TL and the touch sensing line RL extending in the first direction.

[0074] The connection lines 182 are formed in the same number as the touch sensing electrodes Rx disposed in the line in the effective display area AA, and are interconnected with the touch sensing lines RL. Figure 1 As shown, in the case where four touch sensing electrodes are arranged in a line, four connection lines 182 are required. The first connection line 182a interconnects the first touch sensing line RL1 which is spaced apart from each other in a state where the touch drive lines TL1, TL2, TL3 and TL4 and the second to fourth touch sensing lines RL2, RL3 and RL4 are arranged between the first connection line 182a. The second connection line 182b interconnects the second touch sensing line RL2 which is spaced apart from each other in a state where the first touch sensing line RL1, the third touch sensing line RL3 and the fourth touch sensing line RL4 are arranged between the touch drive lines TL1, TL2, TL3 and TL4. The third connection line 182c interconnects the third touch sensing line RL3 which is spaced apart from each other in a state where the first touch sensing line RL1, the second touch sensing line RL2 and the fourth touch sensing line RL4 are arranged between the touch drive lines TL1, TL2, TL3 and TL4. The fourth connection line 182d interconnects the fourth touch sensing line RL4 disposed spaced apart from each other in a state in which the first to third touch sensing lines RL1, RL2, and RL3 and the touch driving lines TL1, TL2, TL3, and TL4 are disposed therebetween.

[0075] At this time, the connection line 182 is arranged in a different plane from the touch driving line TL so as to be isolated from the touch driving line. Since the third touch line 152c of the touch driving line TL arranged in the second connection area LA2 is formed on the anti-crack layer 148 as a touch metal layer, the connection line 182 is arranged on any one of the substrate 101, the buffer layer 112, the gate dielectric film 114, the lower interlayer dielectric film 116, and the upper interlayer dielectric film 118 arranged below the anti-crack layer 148. For example, the connection line 182 is arranged on the upper interlayer dielectric film 118 and is made of the same material as the source electrode 136 and the drain electrode 138. In this case, the connection line 182 is electrically connected to the third touch line 152c of the touch sensing line RL arranged in the second connection area LA2 through the connection contact hole 184, and the connection contact hole 184 is formed through the anti-crack layer 148.

[0076] The second mutual capacitance Cb is formed by the first compensation electrode 180 and the second compensation electrode 190 disposed in the second connection area LA2 so as to be opposite to each other in the vertical direction.

[0077] The first compensation electrodes 180 are formed to protrude from the connection lines 182 interconnecting the touch sensing lines RL, and the width of each of the first compensation electrodes 180 is greater than the width of a corresponding one of the touch sensing lines RL.

[0078] The first compensation electrode 180 is formed in a concave-convex shape, such as Figure 5 As shown, or formed into a rectangle, such as Figure 7 shown.

[0079] Figure 5 The first compensation electrode 180 of the illustrated concavo-convex shape is formed to have a wide line width in a region overlapping with the second compensation electrode 190, and to have a narrow line width in a region not overlapping with the second compensation electrode 190. For example, the first compensation electrode 180 is formed to have a line width smaller than the line width of the connection line 182 in a region not overlapping with the second compensation electrode 190, and to have a line width larger than the line width of the connection line 182 in a region overlapping with the second compensation electrode 190. Since the first compensation electrode 180 is formed to have a narrow line width in a region not overlapping with the second compensation electrode 190, overlap with a display signal line (not shown) electrically connected to the light emitting element 120 can be minimized, thereby minimizing the occurrence of parasitic capacitance.

[0080] Figure 5 The quadrilateral first compensation electrode 180 shown is formed to have the same line width in a region overlapping with the second compensation electrode 190 and a region not overlapping with the second compensation electrode 190. For example, the first compensation electrode 180 is formed to have a line width greater than the line width of the connection line 182. Therefore, the first compensation electrode 180 can be prevented from being broken in a region not overlapping with the second compensation electrode 190.

[0081] The second compensation electrode 190 is formed to protrude from each touch driving line TL in a region overlapping the first compensation electrode 180 , and thus a line width of the second compensation electrode 190 is greater than a line width of each touch driving line TL.

[0082] like Figure 8 As shown, the first compensation electrode 180 and the second compensation electrode 190 overlap each other in a state where the crack prevention layer 148 made of an organic film is disposed therebetween to form a second mutual capacitance Cb. At this time, the first compensation electrode 180 is disposed on the upper interlayer dielectric film 118 as a source and drain metal layer made of the same material as the connection line 182, and the second compensation electrode 190 is disposed on the crack prevention layer 148 as a touch metal layer made of the same material as the touch electrodes Tx and Rx.

[0083] The capacitance value of the second mutual capacitance Cb including the first compensation electrode 180 and the second compensation electrode 190 is formed to be greater than the capacitance value of the first mutual capacitance Ca formed in the effective display area. To this end, the distance between the first compensation electrode 180 and the second compensation electrode 190 is formed to be smaller than the distance between the touch sensing line RL and the touch driving line TL, the first compensation electrode 180 and the second compensation electrode 190 face each other in the vertical direction in a state where the anti-crack layer 148 is arranged therebetween, and the touch sensing line RL and the touch driving line TL face each other in the horizontal direction in the effective display area AA. Optionally, the overlapping area between the first compensation electrode 180 and the second compensation electrode 190 is increased, and the first compensation electrode 180 and the second compensation electrode 190 face each other in the vertical direction in a state where the anti-crack layer 148 is arranged therebetween.

[0084] Therefore, the capacitance value of the second mutual capacitance Cb including the first compensation electrode 180 and the second compensation electrode 190 is formed to be greater than the capacitance value of the first mutual capacitance Ca formed in the effective display area AA. The second mutual capacitance Cb is connected in parallel to the first mutual capacitance Ca, whereby the capacitance value of all mutual capacitances Cm formed between the touch sensing electrode Rx and the touch driving electrode Tx is equal to the sum of the capacitance values ​​of the first mutual capacitance Ca and the second mutual capacitance Cb. At this time, the capacitance value of the second mutual capacitance Cb is several times greater than the capacitance value of the first mutual capacitance Ca, so the capacitance value of the first mutual capacitance Ca has a relatively small effect on the capacitance value of all mutual capacitances Cm. Therefore, the capacitance values ​​of the mutual capacitances Cm formed between the plurality of touch sensing electrodes Rx and the plurality of touch driving electrodes Tx become similar to each other, thereby preventing the capacitance value of the mutual capacitance Cm from being deviated due to the positions of the touch sensing electrode Rx and the touch driving electrode Tx. In addition, the capacitance value of all mutual capacitances Cm formed between the touch sensing electrode Rx and the touch driving electrode Tx is higher than the capacitance value of the self-capacitance C_finger, thereby preventing malfunctions during touch sensing.

[0085] In addition, the first compensation electrode 180 and the second compensation electrode 190 of the present invention are disposed in the non-effective display area NA in which the encapsulation unit 140 is not formed. Therefore, in the present invention, the first compensation electrode 180 and the second compensation electrode 190 face each other in a state where the anti-crack layer 148 (whose thickness is smaller than that of the encapsulation unit 140 disposed in the effective display area) is disposed therebetween, thereby increasing the capacitance value of the second mutual capacitance Cb. In addition, there is no need to provide a contact hole having a large thickness formed through the encapsulation unit 140 in order to connect one of the first compensation electrode 180 and the second compensation electrode 190 to the touch line 152, thereby easily performing the manufacturing process.

[0086] In addition, each of the first compensation electrode 180 and the second compensation electrode 190 of the present invention is formed together with a signal line or electrode set on the substrate 101 through the same mask process as the signal line or electrode, so that each of the first compensation electrode 180 and the second compensation electrode 190 can be formed on the substrate 101 without increasing the area and cost.

[0087] In addition, if Figure 6 and Figure 8 As shown, the adhesion strengthening layer 198 is disposed between each of the first and third touch wires 152a and 152c, the second compensation electrode 190, and the second touch pad electrode 174, and the anti-crack layer 148. The adhesion strengthening layer 198 is formed to include indium, which has high adhesion strength with each of the contact metal layer (e.g., Ti) included in each of the first and third touch wires 152a and 152c, the second compensation electrode 190, and the second touch pad electrode 174, and each of the organic films included in the anti-crack layer 148. For example, the adhesion strengthening layer 198 is made of the same material as the anode 122, including a material based on ITO, IZO, or IGZO, and is formed by the same mask process as the anode 122. In this case, the adhesion strengthening layer 198 has high interface adhesion strength not only with each of the first and third touch wires 152a and 152c, the second compensation electrode 190, and the second touch pad electrode 174, but also with the anti-crack layer 148. Therefore, even when an impact is generated in a plurality of manufacturing processes performed to form the touch passivation film 168 as a final process, each of the first and third touch wires 152a and 152c, the second compensation electrode 190, and the second touch pad electrode 174 can be prevented from being separated from the anti-crack layer 148. In addition, an adhesion reinforcing layer 198 may be further provided between the touch passivation film 168 and each of the first and third touch wires 152a and 152c, the second compensation electrode 190, and the second touch pad electrode 174.

[0088] In the present invention, as described above, the adhesion reinforcing layer 198 is included, and thus each of the first and third touch wires 152a and 152c, the second compensation electrode 190, and the second touch pad electrode 174 may be prevented from being separated from the crack prevention layer 148, thereby improving product yield.

[0089] Fig. 9 and Fig.10 1 and 2 are a plan view and a cross-sectional view showing a non-active display area in which a second mutual capacitance of a touch display device according to a second embodiment of the present invention is disposed.

[0090] In addition to the touch sensing line RL and the touch driving line TL being made of the same material and disposed in the same plane in the bending area BA and the second connection area LA2, Fig. 9 and 10 The touch display device shown in the figure includes Figure 5 and 6 Therefore, detailed description of the same components will be omitted.

[0091] Each of the touch lines 152 including the touch sensing line RL and the touch driving line TL is formed as a first touch line 152a in the first connection area LA1, and is formed as a second touch line 152b in the second connection area LA2.

[0092] The first touch line 152a extends from each of the touch sensing electrode Rx and the touch driving electrode Tx, and is disposed in the effective display area AA and the first connection area LA1. The first touch line 152a is made of the same material as each of the touch sensing electrode Rx and the touch driving electrode Tx, and is formed by the same mask process as each of the touch sensing electrode Rx and the touch driving electrode Tx. The first line 152a is formed to have a single-layer structure or a multi-layer structure using a contact metal layer having high corrosion resistance, acid resistance, and conductivity such as Al, Ta, Ti, Cu, or Mo.

[0093] The second touch line 152b is electrically connected to the first touch line 152a exposed through the touch contact hole 156 formed through the crack prevention layer 148. The second touch line 152b is disposed in the bending area BA and the second connection area LA2, and is formed using the same material as the source electrode 136 and the drain electrode 138 through the same mask process as the source electrode 136 and the drain electrode 138.

[0094] The touch wires 152 including the first touch wire 152a and the second touch wire 152b are electrically connected to the touch pads 170 provided in the pad area PA.

[0095] The connection line 182 and the compensation capacitor CA are disposed in the second connection area LA2 between the pad area PA in which the touch pad is disposed and the bending area BA.

[0096] The connection line 182 is disposed in a different plane from the second touch line 152 b of the touch drive line TL so as to be isolated from the touch drive line TL.

[0097] The second touch line 152b of the touch driving line TL disposed in the second connection area LA2 is formed on the upper interlayer dielectric film 118 as the source and drain metal layer. In this case, the connection line 182 is disposed on the anti-crack layer 148, and the anti-crack layer 148 is disposed on the upper interlayer dielectric film 118 or any one of the substrate 101, the buffer layer 112, the gate dielectric film 114, and the lower interlayer dielectric film 116 disposed below the upper interlayer dielectric film 118, as shown in FIG. Fig.10 and Fig.12 shown.

[0098] For example, Fig.10 The connection line 182 shown is disposed on the gate dielectric film 114 and is made of the same material as the gate 132. In this case, the connection line 182 is electrically connected to the second touch line 152b of the touch sensing line RL disposed in the second connection area LA2 through a connection contact hole 184 formed through the lower interlayer dielectric film 116 and the upper interlayer dielectric film 118. Fig.11 As shown, since the first compensation electrode 180 protrudes from the connection line 182, it overlaps with the second compensation electrode 190 in a state where the lower interlayer dielectric film 116 and the upper interlayer dielectric film 118 are interposed therebetween, so the second mutual capacitance Cb is formed. At this time, the first compensation electrode 180 is formed on the gate dielectric film 114 as a gate metal layer made of the same material as the connection line 182, and the second compensation electrode 190 is formed on the upper interlayer dielectric film 118 as a source and drain metal layer made of the same material as the source 136 and the drain 138.

[0099] Fig.12 The connection line 182 shown is disposed on the lower interlayer dielectric film 116 and is made of the same material as the third storage electrode 106. In this case, the connection line 182 is electrically connected to the second touch line 152b of the touch sensing line RL disposed in the second connection area LA2 through a connection contact hole 184 formed through the upper interlayer dielectric film 118. Fig.13As shown, since the first compensation electrode 180 protrudes from the connection line 182 and overlaps with the second compensation electrode 190, with the upper interlayer dielectric film 118 disposed therebetween, a second mutual capacitance Cb is formed. At this time, the first compensation electrode 180 is formed on the lower interlayer dielectric film 116 as a storage metal layer made of the same material as the third storage electrode 106, and the second compensation electrode 190 is formed on the upper interlayer dielectric film 118 as a source and drain metal layer made of the same material as the source 136 and the drain 138.

[0100] Fig.11 and 13 The capacitance value of the second mutual capacitance Cb shown, which includes the first compensation electrode 180 and the second compensation electrode 190, is formed to be greater than the capacitance value of the first mutual capacitance Ca formed in the effective display area AA. The second mutual capacitance Cb is connected in parallel to the first mutual capacitance Ca, whereby the capacitance value of all mutual capacitances Cm formed between the touch sensing electrode Rx and the touch drive electrode Tx is equal to the sum of the capacitance values ​​of the first mutual capacitance Ca and the second mutual capacitance Cb. At this time, the capacitance value of the second mutual capacitance Cb is several times greater than the capacitance value of the first mutual capacitance Ca, so the capacitance value of the first mutual capacitance Ca has a relatively small effect on the capacitance value of all mutual capacitances Cm. Therefore, the capacitance values ​​of the mutual capacitances Cm formed between the plurality of touch sensing electrodes Rx and the plurality of touch drive electrodes Tx become similar to each other, thereby preventing the capacitance values ​​of the mutual capacitances Cm from being deviated due to the positions of the touch sensing electrodes Rx and the touch drive electrodes Tx.

[0101] In addition, the capacitance values ​​of all mutual capacitances Cm formed between the touch sensing electrodes Rx and the touch driving electrodes Tx are higher than the capacitance value of the self capacitance C_finger, thereby preventing malfunction at the time of touch sensing.

[0102] In addition, the first compensation electrode 180 and the second compensation electrode 190 of the present invention are disposed in the non-effective display area NA in which the encapsulation unit 140 is not formed. Therefore, in the present invention, the first compensation electrode 180 and the second compensation electrode 190 face each other in a state where the lower interlayer dielectric film 116 and the upper interlayer dielectric film 118 (whose thickness is less than the encapsulation unit 140 disposed in the effective display area) are disposed therebetween or the upper interlayer dielectric film 118 is disposed therebetween, thereby increasing the capacitance value of the second mutual capacitance Cb. In addition, there is no need to provide a contact hole having a large thickness formed through the encapsulation unit 140 in order to connect one of the first compensation electrode 180 and the second compensation electrode 190 to the touch line 152, thereby making it easy to perform the manufacturing process.

[0103] Fig.14 and Fig.15 1 and 2 are a plan view and a cross-sectional view showing a non-active display area in which a second mutual capacitance of a touch display device according to a third embodiment of the present invention is provided.

[0104] In addition to including touch pad contact hole 176, Fig.14 and Fig.15 The touch display device shown includes Figure 5 and Figure 6 Therefore, detailed description of the same components will be omitted.

[0105] Each touch line 152 including the touch sensing line RL and the touch driving line TL is formed as a first touch line 152a in the first connection area LA1, as a second touch line 152b in the bending area BA, and as a third touch line 152c in the second connection area LA2.

[0106] The first touch line 152a extends from each of the touch sensing electrode Rx and the touch driving electrode Tx and is disposed in the effective display area AA and the first connection area LA1. The first touch line 152a is made of the same material as each of the touch sensing electrode Rx and the touch driving electrode Tx and is formed by the same mask process as each of the touch sensing electrode Rx and the touch driving electrode Tx.

[0107] The second touch wire 152b is electrically connected to the first touch wire 152a exposed through the first touch contact hole 156a formed through the crack prevention layer 148. The second touch wire 152b is disposed in the bending area BA and the second connection area LA2, and is formed using the same material as the source electrode 136 and the drain electrode 138 through the same mask process.

[0108] The third touch line 152c is electrically connected to the second touch line 152b exposed by the second touch contact hole 156b formed through the upper interlayer dielectric film 118. The third touch line 152c is disposed in the second connection area LA2. The third touch line 152c is formed by the same mask process as the third storage electrode 106 using a storage metal layer made of the same material as the third storage electrode.

[0109] The touch line 152 including the first to third touch lines 152a, 152b, and 152c is electrically connected to the touch pad 170 arranged in the pad area PA. The touch pad 170 includes a first touch pad electrode 172 and a second touch pad electrode 174.

[0110] The first touch pad electrode 172 is made of a different material from the third touch line 152c and is disposed in a different plane from the third touch line 152c. For example, the first touch pad electrode 172 is disposed on the upper interlayer dielectric film 118 as the same source and drain metal layer as the source and drain, and the third touch line is disposed on the lower interlayer dielectric film 116 as the same storage metal layer as the third storage electrode 106. Therefore, the first touch pad electrode 172 is electrically connected to the third touch line 152c exposed by the pad contact hole 176 formed through the upper interlayer dielectric film 118.

[0111] The second touch pad electrode 174 is made of the same material as the touch sensing electrode Rx and the touch driving electrode Tx, and is disposed on the first touch pad electrode 172. The second touch pad electrode 174 is electrically connected to the first touch pad electrode 172 without a separate contact hole.

[0112] The connection line 182 and the compensation capacitor CA are disposed in the second connection area LA2 between the pad area PA in which the touch pad is disposed and the bending area BA.

[0113] The connection line 182 is disposed in a different plane from the third touch line 152c of the touch drive line TL so as to be isolated from the touch drive line TL.

[0114] The third touch line 152c of the touch drive line TL disposed in the second connection area LA2 is formed on the lower interlayer dielectric film 116 as a storage metal layer. In this case, the connection line 182 is disposed on the anti-crack layer 148 disposed on any one of the substrate 101, the buffer layer 112, and the gate dielectric film 114, and the substrate 101, the buffer layer 112, and the gate dielectric film 114 are disposed under the lower interlayer dielectric film 116, the upper interlayer dielectric film 118, or the anti-crack layer 148.

[0115] For example, the connection line 182 is disposed on the gate dielectric film 114 and is made of the same material as the gate electrode 132. In this case, the connection line 182 is electrically connected to the third touch line 152c of the touch sensing line RL disposed in the second connection area LA2 through a connection contact hole 184 formed through the lower interlayer dielectric film 116. Fig.16 As shown, since the first compensation electrode 180 is formed in a manner of protruding from the connection line 182 to overlap with the second compensation electrode 190, wherein the lower interlayer dielectric film 116 is disposed between the first compensation electrode 180 and the second compensation electrode 190, a second mutual capacitance Cb is formed. At this time, the first compensation electrode 180 is formed on the gate dielectric film 114 as a gate metal layer made of the same material as the connection line 182, and the second compensation electrode 190 is formed on the lower interlayer dielectric film 116 as a storage metal layer made of the same material as the third storage electrode 106.

[0116] The capacitance value of the second mutual capacitance Cb including the first compensation electrode 180 and the second compensation electrode 190 is formed to be greater than the capacitance value of the first mutual capacitance Ca formed in the effective display area AA. The second mutual capacitance Cb is connected in parallel to the first mutual capacitance Ca, whereby the capacitance value of all mutual capacitances Cm formed between the touch sensing electrode Rx and the touch drive electrode Tx is equal to the sum of the capacitance values ​​of the first mutual capacitance Ca and the second mutual capacitance Cb. At this time, the capacitance value of the second mutual capacitance Cb is several times greater than the capacitance value of the first mutual capacitance Ca, so the capacitance value of the first mutual capacitance Ca has a relatively small effect on the capacitance value of all mutual capacitances Cm. Therefore, the capacitance values ​​of the mutual capacitances Cm formed between the plurality of touch sensing electrodes Rx and the plurality of touch drive electrodes Tx become similar to each other, thereby preventing the capacitance values ​​of the mutual capacitances Cm from being deviated due to the positions of the touch sensing electrodes Rx and the touch drive electrodes Tx.

[0117] In addition, the capacitance values ​​of all mutual capacitances Cm formed between the touch sensing electrodes Rx and the touch driving electrodes Tx are higher than the capacitance value of the self capacitance C_finger, thereby preventing malfunction at the time of touch sensing.

[0118] In addition, the first compensation electrode 180 and the second compensation electrode 190 of the present invention are disposed in the non-effective display area NA in which the encapsulation unit 140 is not formed. Therefore, in the present invention, the first compensation electrode 180 and the second compensation electrode 190 face each other in a state where the lower interlayer dielectric film 116 (whose thickness is smaller than that of the encapsulation unit 140 disposed in the effective display area) is disposed therebetween, thereby increasing the capacitance value of the second mutual capacitance Cb. In addition, there is no need to provide a contact hole having a large thickness formed through the encapsulation unit 140 in order to connect one of the first compensation electrode 180 and the second compensation electrode 190 to the touch line 152, thereby easily performing the manufacturing process.

[0119] In addition, in the present invention, a structure in which each of the plurality of touch pads 170 is connected to a corresponding one of the plurality of touch sensing lines RL in a one-to-one correspondence is described by way of example. Fig.17 As shown, the plurality of touch sensing lines RL connected to each other through the connection lines 182 may be connected to a single touch pad 170 in a many-to-one manner. For example, the plurality of first touch sensing lines RL1 connected to each other through the connection lines 182 may be connected to a single touch pad 170, and the plurality of second touch sensing lines RL2 connected to each other through the connection lines 182 may be connected to a single touch pad 170. That is, m touch sensing lines RLm (m is a natural number) connected to each other through the connection lines 182 are connected to a single touch pad 170. In this case, the number of touch pads 170 may be reduced, thereby reducing the border area.

[0120] In addition, in the present invention, a structure in which the length of each touch sensing electrode RX is greater than the length of a corresponding touch driving electrode TX is described by way of example. Alternatively, the length of each touch driving electrode TX may be greater than the length of a touch sensing electrode RX. In this case, the touch driving electrodes TX may be connected to each other through the connection line 182, and the touch driving electrodes TX connected to each other through the connection line 182 may be connected to a single touch pad 170.

[0121] In addition, in the present invention, the structure of forming the second mutual capacitance Cb by overlapping the first compensation electrode 180 and the second compensation electrode 190 has been described by way of example. Alternatively, the first compensation electrode 180 and the second compensation electrode 190 face each other in a horizontal direction without overlapping to form the second mutual capacitance Cb.

[0122] In addition, in the present invention, the structure in which the second mutual capacitance Cb is disposed on the substrate 101 is described by way of example. Alternatively, the second mutual capacitance Cb may be disposed in a region other than the substrate 101. For example, a compensation circuit including the second mutual capacitance Cb may be disposed on the signal transmission film 194, such as Fig.18A As shown, or it can be set in the touch drive integrated circuit 192, such as Fig.18B Or as shown in 18C.

[0123] Fig.18A The second mutual capacitance Cb shown in FIG. 1 is formed by overlapping the first compensation electrode 180 and the second compensation electrode 190 on a signal transmission film 194 (eg, a tape carrier package (TCP) or a flexible printed circuit (FPC)). Fig.18B In the second mutual capacitance Cb shown, the first compensation electrode 180 and the second compensation electrode 190 are disposed in the touch driving integrated circuit 192 so as to overlap each other. Fig.18C The second mutual capacitor Cb is shown as a chip mounted in the touch drive integrated circuit 192, or mounted on the signal transmission film 194. One end of the chip-type second mutual capacitor Cb is connected to one of the touch sensing electrode Rx and the touch drive electrode Tx, and the other end is connected to the other of the touch sensing electrode Rx and the touch drive electrode Tx.

[0124] In the present invention, as described above, the second mutual capacitor Cb having the second capacitance value is set in the non-effective display area NA except the effective display area AA, and the second capacitance value is greater than the first capacitance value of the first mutual capacitor Ca. For example, the second mutual capacitor Cb is set in the non-effective display area including the periphery of the substrate 101 (including the second connection area LA2, the signal transmission film 194 and the touch drive integrated circuit 192). Therefore, in the present invention, the capacitance values ​​of all mutual capacitors Cm are increased by the second mutual capacitor Cb, thereby preventing the degradation of touch performance.

[0125] As is apparent from the above description, in the present invention, the first mutual capacitors provided in the effective display area and the second mutual capacitors provided in the non-effective display area are included, thereby increasing the capacitance values ​​of all mutual capacitors Cm, thereby preventing degradation of touch performance.

[0126] In addition, in the present invention, the capacitance value of the second mutual capacitance is greater than the capacitance value of the first mutual capacitance. Therefore, the capacitance value of the first mutual capacitance has little effect on the capacitance values ​​of all mutual capacitances Cm, thereby preventing the deviation of the capacitance value of the first mutual capacitance caused by the positions of the touch sensing electrodes and the touch driving electrodes arranged in the effective display area.

[0127] Furthermore, in the present invention, the capacitance values ​​of all mutual capacitances Cm are higher than the capacitance value of the self capacitance C_finger, thereby preventing malfunction during touch sensing.

[0128] In addition, the first compensation electrode and the second compensation electrode of the present invention are arranged in a non-effective display area in which the encapsulation unit is not formed or in a peripheral area other than the substrate. Therefore, in the present invention, the first compensation electrode and the second compensation electrode face each other in a state where a dielectric film having a thickness less than that of the encapsulation unit is arranged between them, thereby increasing the capacitance value of the second mutual capacitance. In addition, there is no need to provide a contact hole having a large thickness formed through the encapsulation unit, thereby making it easy to perform a manufacturing process.

[0129] The above description only illustrates the present invention, and it is obvious to those skilled in the art that various modifications and changes can be made to the present invention without departing from the technical idea of ​​the present invention. Therefore, the embodiments disclosed in the specification of the present invention limit the present invention. The scope of the present invention should be interpreted by the attached claims, and all technical concepts included in the scope equivalent thereto should be interpreted as falling within the scope of the present invention.

Claims

1. A touch display device, comprising: A substrate having an effective display area and a non-effective display area excluding the effective display area; A light emitting element, wherein the light emitting element is arranged in the effective display area of ​​the substrate; A packaging unit, wherein the packaging unit is arranged on the light-emitting element; touch sensing electrodes and touch driving electrodes, wherein the touch sensing electrodes and the touch driving electrodes are disposed on the packaging unit, and the touch sensing electrodes and the touch driving electrodes are configured to form a first mutual capacitance; a touch sensing line, the touch sensing line being disposed in the non-effective display area and connected to the touch sensing electrode; A touch drive line, the touch drive line is arranged in the non-effective display area and connected to the touch drive electrode; as well as a compensation circuit, the compensation circuit being configured to form a second mutual capacitance in the non-effective display area of ​​the substrate, a second capacitance value of the second mutual capacitance being greater than a first capacitance value of the first mutual capacitance, Wherein, the second mutual capacitance includes a first compensation electrode and a second compensation electrode, Wherein, the second compensation electrode is connected to the touch drive line, and Wherein, the first compensation electrode is connected to the touch sensing line through a connecting line and overlaps with the second compensation electrode.

2. The touch display device according to claim 1, wherein: The second mutual capacitance is connected in parallel to the first mutual capacitance.

3. The touch display device according to claim 2, further comprising: a thin film transistor connected to the light emitting element; as well as A storage capacitor is connected to the thin film transistor.

4. The touch display device according to claim 3, wherein: The first compensation electrode and the second compensation electrode are disposed on the non-effective display area of ​​the substrate.

5. The touch display device according to claim 3, wherein: The second compensation electrode is made of the same material as the touch sensing electrode and the touch driving electrode, and The first compensation electrode is made of the same material as the source and drain of the thin film transistor, and is disposed in the same plane as the source and drain of the thin film transistor.

6. The touch display device according to claim 3, wherein: The second compensation electrode is made of the same material as the source and drain of the thin film transistor and is arranged in the same plane as the source and drain of the thin film transistor, and The first compensation electrode is made of the same material as one of the gate electrode of the thin film transistor and the storage electrode of the storage capacitor, and is disposed in the same plane as one of the gate electrode of the thin film transistor and the storage electrode of the storage capacitor.

7. The touch display device according to claim 3, wherein: The second compensation electrode is made of the same material as the storage electrode of the storage capacitor and is disposed in the same plane as the storage electrode of the storage capacitor, and The first compensation electrode is made of the same material as the gate electrode of the thin film transistor and is disposed in the same plane as the gate electrode.

8. The touch display device according to claim 2, further comprising: a signal transmission film attached to at least one side of the substrate; as well as A driver integrated circuit is mounted on the signal transmission film, wherein: The first compensation electrode and the second compensation electrode are disposed on the signal transmission film or in the driving integrated circuit.

9. The touch display device according to claim 2, wherein: The touch sensing electrodes and the touch driving electrodes are opposite to each other in a horizontal direction, and The first compensation electrode and the second compensation electrode are opposite to each other in a vertical direction.

10. The touch display device according to claim 2, wherein: The touch sensing electrodes and the touch driving electrodes do not overlap each other.

11. The touch display device according to claim 2, further comprising: a signal transmission film attached to at least one side of the substrate; as well as A driver integrated circuit is mounted on the signal transmission film, wherein: The second mutual capacitor is mounted in the driving integrated circuit in the form of a chip having the second capacitance value.

12. The touch display device according to claim 11, wherein: One end of the chip-type second mutual capacitor is connected to one of the touch sensing electrode and the touch driving electrode, and The other end of the chip-type second mutual capacitor is connected to the other of the touch sensing electrode and the touch driving electrode.

13. The touch display device according to claim 1, wherein: At least one of the touch sensing electrodes and the touch driving electrodes is formed in a mesh shape.

14. The touch display device according to claim 13, further comprising: a bank, the bank being arranged between the light emitting elements, The mesh-shaped touch sensing electrodes and the mesh-shaped touch driving electrodes overlap with the bank.

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