Touch panel and display device

Abstract

The present invention relates to the field of display technology and discloses a touch panel and a display device. The touch panel includes a substrate and a touch electrode layer disposed on the substrate. The touch electrode layer includes: a plurality of electrode blocks distributed in rows and columns, wherein the electrode blocks located in the edge region of the substrate are edge electrode blocks, and the edge electrode blocks include defective electrode blocks having an area smaller than that of the electrode blocks located in the central region of the substrate; compensation electrodes corresponding one-to-one to the defective electrode blocks, the compensation electrodes and the defective electrode blocks being stacked, and in each group of corresponding defective electrode blocks and compensation electrodes, the defective electrode blocks are electrically connected to the compensation electrodes, and the orthographic projection of the compensation electrodes on the substrate falls within the orthographic projection range of the defective electrode blocks on the substrate. The touch electrode layer of the touch panel is provided with compensation electrodes, which are connected to the defective electrode blocks located in the edge region of the substrate to compensate for the capacitance of the defective electrode blocks, thereby improving the uniformity of capacitance across the touch electrode layer and enhancing product quality.

Description

Technical Field

[0001] The present invention relates to the field of touch technology, and in particular to a touch panel and a display device. Background Art

[0002] Currently, AMOLED displays implement touch electrode configurations, typically with multiple touch electrodes distributed horizontally and vertically. To improve touch signal accuracy, each touch electrode is formed by multiple block patterns connected in sequence at opposite corners. However, the screen has a straight-edge structure on the side, and the block patterns at the edges are partially missing to accommodate the straight edges. The missing block patterns of the touch electrodes at the edges cause the capacitance of the touch panel to be smaller around the edges and larger in the center, resulting in poor overall capacitance uniformity. This is primarily reflected in a wide range of capacitance differences, the risk of missed detection or over-detection, and reduced product yield. Summary of the Invention

[0003] The present invention discloses a touch panel and a display device. A compensation electrode is provided in the touch electrode layer of the touch panel. The compensation electrode is connected to a defective electrode block located in the edge area of ​​a substrate to compensate for the capacitance of the defective electrode block, thereby improving the uniformity of the capacitance at various locations in the touch electrode layer, making the touch signal of the touch panel more accurate, improving the touch accuracy of the touch panel, reducing product yield loss, and improving product quality.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A touch panel comprises: a substrate and a touch electrode layer provided on the substrate; the touch electrode layer comprises:

[0006] a plurality of electrode blocks arranged in rows and columns, wherein the electrode blocks located in the edge region of the substrate are edge electrode blocks, and the edge electrode blocks include incomplete electrode blocks having an area smaller than that of the electrode blocks located in the middle region of the substrate;

[0007] The compensation electrodes correspond one-to-one to the defective electrode blocks, and the compensation electrodes and the defective electrode blocks are stacked. In each group of mutually corresponding defective electrode blocks and compensation electrodes, the defective electrode blocks are electrically connected to the compensation electrodes, and the orthographic projection of the compensation electrodes on the substrate falls within the orthographic projection range of the defective electrode blocks on the substrate.

[0008] In the above-mentioned touch panel, a compensation electrode is provided in the touch electrode layer. The compensation electrode corresponds to the defective electrode block located in the edge area of ​​the substrate, and can compensate for the capacitance of the defective electrode block, reduce the capacitance difference between the defective electrode block located in the edge area of ​​the substrate and the electrode block located in the middle area of ​​the substrate, and improve the uniformity of the capacitance in each part of the touch electrode layer, so as to make the touch signal of the touch panel more accurate, improve the touch accuracy of the touch panel, reduce the product yield loss, and improve the product quality.

[0009] Optionally, in the mutually corresponding defective electrode block and the compensation electrode, the sum of the area of ​​the compensation electrode and the area of ​​the defective electrode block is smaller than or equal to the area of ​​the electrode block in the central region of the substrate.

[0010] Optionally, the area of ​​the defective electrode block is less than or equal to half the area of ​​the electrode block in the central region of the substrate, and the orthographic projection of the compensation electrode on the substrate coincides with the orthographic projection of the defective electrode block on the substrate.

[0011] Optionally, the area of ​​the defective electrode block is larger than half the area of ​​the electrode block in the central region of the substrate, and the area of ​​the compensation electrode is the same as the area of ​​the missing portion of the defective electrode block relative to the electrode block in the central region of the substrate.

[0012] Optionally, a side of the compensation electrode facing an edge of the substrate is aligned with a side of the substrate.

[0013] Optionally, in the corresponding incomplete electrode blocks and compensation electrodes, an insulating layer is provided between the incomplete electrode blocks and the compensation electrodes, and the incomplete electrode blocks and the compensation electrodes are electrically connected via at least one via hole penetrating the insulating layer.

[0014] Optionally, both the electrode block and the compensation electrode have a grid pattern.

[0015] Optionally, the plurality of electrode blocks distributed in rows and columns constitute first touch electrodes extending along a first direction and second touch electrodes extending along a second direction, and the first direction and the second direction are perpendicular to each other.

[0016] Optionally, the electrode blocks are arranged in the same layer; two adjacent electrode blocks in the first touch electrodes are electrically connected, and two adjacent electrode blocks in the second touch electrodes are electrically connected via a bridge portion.

[0017] Optionally, the compensation electrode and the bridging portion are arranged in the same layer.

[0018] Optionally, the first touch electrode is located on the first conductive film layer, and the second touch electrode is located on the second conductive film layer;

[0019] The compensation electrodes corresponding to the defective electrodes belonging to the first touch electrodes are located in the second conductive film layer, and the compensation electrodes corresponding to the defective electrodes belonging to the second touch electrodes are located in the first conductive film layer.

[0020] Based on the same inventive concept, the present invention further provides a display device, comprising any one of the touch panels provided by the above technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the planar structure of a touch panel provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the distribution of compensation electrodes in a touch panel provided by an embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of a defective electrode block and a compensation electrode provided by an embodiment of the present invention;

[0024] Figure 4 A schematic structural diagram of a defective electrode block and a compensation electrode provided by an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of an electrode block provided in an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of a stacked structure of a defective electrode block and a compensation electrode provided by an embodiment of the present invention;

[0027] Icons: 1-substrate; 2-touch electrode layer; 21-electrode block; 21a-incomplete electrode block; 22-compensation electrode; 23-insulating layer; 24-first touch electrode; 25-second touch electrode; 231-via. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] like Figure 1 、 Figure 2 and Figure 6As shown, an embodiment of the present invention provides a touch panel, which includes: a substrate 1 and a touch electrode layer 2 provided on the substrate 1; the touch electrode layer 2 specifically includes: a plurality of electrode blocks 21 and compensation electrodes 22 distributed in rows and columns, wherein the electrode blocks 21 located in the edge area of ​​the substrate 1 are called edge electrode blocks, and the edge electrode blocks include defective electrode blocks 21a whose area is smaller than the area of ​​the electrode blocks 21 located in the middle area of ​​the substrate 1. Since the area of ​​the defective electrode blocks 21a is smaller than the area of ​​the electrode blocks 21 in the middle area of ​​the substrate 1, the capacitance value is relatively low, and the compensation electrodes 22 are provided in a one-to-one correspondence with the defective electrode blocks 21a, and the compensation electrodes 22 are aligned with the defective electrode blocks 21a. The electrode blocks 21a are stacked, and the corresponding compensation electrodes 22 and the defective electrode blocks 21a are electrically connected. The compensation electrodes 22 can compensate for the capacitance of the defective electrode blocks 21a, thereby reducing the capacitance difference between the edge and the middle area of ​​the touch electrode layer 2. In each group of corresponding defective electrode blocks 21a and compensation electrodes 22, the orthographic projection of the compensation electrode 22 on the substrate 1 falls within the orthographic projection range of the defective electrode block 21a on the substrate 1, and the area of ​​the compensation electrode 22 will not exceed the area of ​​the corresponding defective electrode block 21a, thereby avoiding overlap between the compensation electrode 22 and other adjacent electrode blocks 21, thereby avoiding affecting the touch accuracy.

[0030] In the above-mentioned touch panel, a compensation electrode is provided in the touch electrode layer. The compensation electrode corresponds to the defective electrode block located in the edge area of ​​the substrate, and can compensate for the capacitance of the defective electrode block, thereby reducing the capacitance difference between the defective electrode block located in the edge area of ​​the substrate and the electrode block located in the middle area of ​​the substrate, so that the capacitance data of each location in the entire touch electrode layer converges. The established capacitance difference range enables stronger product control capabilities, improves the uniformity of the capacitance of the entire touch electrode layer, improves the touch accuracy of the touch panel, reduces product yield loss, and improves product quality.

[0031] For the specific compensation rules of the compensation electrode for the incomplete electrode block, refer to Figure 3 and Figure 4 As shown, Figure 3 The portion indicated by the dotted line is the missing portion of the electrode block relative to the electrode block in the middle area of ​​the substrate. Figure 4 The dotted line in the figure represents the missing portion of the defective electrode block relative to the electrode block in the central region of the substrate. In the corresponding defective electrode block 21a and compensation electrode 22, the sum of the area of ​​the compensation electrode 22 and the area of ​​the defective electrode block 21a is less than or equal to the area of ​​the electrode block 21 in the central region of the substrate 1. This prevents overcompensation for the defective electrode block 21a, ensures that the compensation electrode 22 effectively compensates for the defective electrode block 21a, and improves the capacitance uniformity across the touch electrode layer 2.

[0032] Specifically, in a possible implementation, as Figure 3As shown, when the area of ​​the defective electrode block 21a is less than or equal to one-half the area of ​​the electrode block 21 in the central region of the substrate 1, the orthographic projection of the compensation electrode 22 on the substrate 1 is arranged to coincide with the orthographic projection of the defective electrode block 21a on the substrate 1. The area of ​​the compensation electrode 22 is set to be equal to the area of ​​the defective electrode block 21a. This minimizes the capacitance difference between the defective electrode block 21a and the electrode block 21 in the central region of the substrate 1, improves the capacitance uniformity of the touch electrode layer 2, and does not affect the touch signals of other adjacent electrode blocks 21. In addition, to maximize compensation for the capacitance of the defective electrode block 21a, the compensation electrodes 22 can be provided in two or more layers, with each layer of compensation electrodes 22 stacked, and the area of ​​all the compensation electrodes 22 combined with the area of ​​the defective electrode block 21a is less than or equal to the area of ​​the electrode block 21 in the central region of the substrate 1.

[0033] In another possible implementation, Figure 4 As shown, when the area of ​​the defective electrode block 21a is larger than half of the area of ​​the electrode block 21 in the middle area of ​​the substrate 1, the area of ​​the compensation electrode 22 is set to be the same as the area of ​​the missing part of the defective electrode block 21a relative to the electrode block 21 in the middle area of ​​the substrate 1, that is, the sum of the area of ​​the compensation electrode 22 and the area of ​​the corresponding defective electrode block 21a is equal to the area of ​​the electrode block 21 in the middle area of ​​the substrate 1, and the pattern of the compensation electrode 22 can be made the same as the pattern of the missing part of the defective electrode block 21a relative to the electrode block 21 in the middle area of ​​the substrate 1, so that the splicing of the compensation electrode 22 and the defective electrode block 21a can be exactly the same as the shape of the electrode block 21 in the middle area of ​​the substrate 1, thereby achieving better compensation and helping to improve the compensation effect.

[0034] Specifically, the compensation electrode is positioned in the direction of the substrate plane, such as Figure 4 As shown, the side of the compensation electrode 22 facing the edge of the substrate 1 can be arranged to be aligned with the side of the substrate 1, so that the compensation electrode 22 can compensate as much as possible at the edge of the substrate 1. After the compensation electrode 22 is connected to the corresponding defective electrode block 21a, the structure has an effect similar to the folding of the electrode block 21, so that the compensation electrode 22 and the defective electrode block 21a are as similar as possible in shape to the complete electrode block 21 in the middle area of ​​the substrate 1, which is beneficial to improving the compensation effect and improving the capacitance uniformity of each part of the touch electrode layer.

[0035] In the stacking direction, Figure 6As shown, in the corresponding incomplete electrode blocks 21a and compensation electrodes 22, an insulating layer 23 is provided between the incomplete electrode block 21a and the compensation electrode 22, and the incomplete electrode block 21a and the compensation electrode 22 are electrically connected through at least one via 231 penetrating the insulating layer 23. Specifically, in the corresponding compensation electrodes 22 and incomplete electrode blocks 21a, the compensation electrode 22 and the incomplete electrode block 21a can be connected through two or three vias 231, which can ensure the connection stability between the incomplete electrode block 21a and the compensation electrode 22.

[0036] Furthermore, the via hole is arranged in a portion of the insulating layer 23 close to the side edge of the substrate 1 , and the connection portion between the compensation electrode 22 and the defective electrode block 21 a is arranged as close to the side edge of the substrate 1 as possible.

[0037] In one possible implementation, refer to Figure 5 As shown, both the electrode block 21 and the compensation electrode 22 have a grid pattern, and the via holes can be arranged at the points of the grid pattern.

[0038] Specifically, the above-mentioned touch panel is a touch display panel, the touch electrode layer corresponds to the display area of ​​the touch display panel, and the display area of ​​the touch display panel has array-distributed sub-pixels and a black matrix located around the sub-pixel units. The mesh ports of the above-mentioned grid pattern can have a one-to-one correspondence with the sub-pixels, and the grid lines of the grid pattern are opposite to the black matrix to ensure the pixel light output rate. In addition, in order to further improve the light output rate of the touch display panel, in the corresponding mesh ports and sub-pixels, the orthographic projection of the sub-pixels on the substrate falls within the orthographic projection range of the mesh ports on the substrate.

[0039] Specifically, if Figure 1 As shown, in the above touch panel, multiple electrode blocks 21 arranged in rows and columns constitute first touch electrodes 24 extending along a first direction and second touch electrodes 25 extending along a second direction. The first and second directions are perpendicular to each other, and the first touch electrodes 24 and the second touch electrodes 25 are insulated from each other. The first direction can be the row direction of the electrode blocks 21 arranged in rows and columns, and the second direction can be the column direction of the electrode blocks 21 arranged in rows and columns. There are multiple first touch electrodes 24, and the multiple first touch electrodes 24 are arranged in the second direction, and the first touch electrodes 24 are insulated from each other. There are multiple second touch electrodes 25, and the multiple second touch electrodes 25 are arranged in the second direction, and the second touch electrodes 25 are insulated from each other.

[0040] Further, if Figure 1As shown, the electrode blocks 21 can be arranged on the same layer. Adjacent electrode blocks 21 in the first touch electrodes 24 are electrically connected, and adjacent electrode blocks 21 in the second touch electrodes 25 are electrically connected via a bridge. Furthermore, the compensation electrode 22 can be arranged on the same layer as the bridge, which simplifies the manufacturing process.

[0041] Alternatively, the first touch electrode and the second touch electrode are arranged in different layers, then all the electrode blocks are divided into two electrode blocks arranged in different layers, wherein the first touch electrode is located in the first conductive film layer, and the second touch electrode is located in the second conductive film layer, that is, part of the electrode block is located in the first conductive film layer, and the other part is located in the second conductive film layer; and, the compensation electrode corresponding to the defective electrode belonging to the first touch electrode 24 is located in the second conductive film layer, and the compensation electrode corresponding to the defective electrode belonging to the second touch electrode is located in the first conductive film layer, so that the compensation electrode can be prepared when preparing the first touch electrode and the second touch electrode, which is beneficial to saving preparation steps.

[0042] In the above touch panel, the electrode blocks on the substrate, excluding the defective electrode blocks, have the same area and shape and are evenly distributed on the substrate. Figure 1 As shown, the shape of the electrode block 21 can be a diamond or a square, and in the same first touch electrode 24, the corner tips of two adjacent electrode blocks 21 are arranged opposite to each other, and the diagonal line of the electrode block 21 is in the extension direction of the first touch electrode 24, and the corners of two adjacent electrode blocks 21 belonging to the same first touch electrode 24 are connected; similarly, in the same second touch electrode 25, the corner tips of two adjacent electrode blocks 21 are arranged opposite to each other, and the diagonal line of the electrode block 21 is in the extension direction of the second touch electrode 25, and the corners of two adjacent electrode blocks 21 belonging to the same second touch electrode 25 are connected; multiple first touch electrodes 24 and second touch electrodes 25 are connected. The control electrodes 25 are staggered with each other, and the corner connections of two adjacent electrode blocks 21 of the first touch electrode 24 and the corner connections of two adjacent electrode blocks 21 of the second touch electrode 25 are staggered with each other, so that the electrode block 21 belonging to the first touch electrode 24 is adjacent to the side of the electrode block 21 belonging to the second touch electrode 25, and the electrode block 21 belonging to the first touch electrode 24 and the electrode block 21 belonging to the second touch electrode 25 can be compactly assembled together to cover the entire surface of the substrate 1, so that the entire surface of the touch panel is covered by the electrode blocks 21, so that the touch signal can be accurately sensed at all parts of the touch surface, which is beneficial to improving the sensing accuracy of the touch panel.

[0043] Based on the same inventive concept, this embodiment further provides a display device, wherein the display panel includes any one of the touch panels provided in the above embodiments.

[0044] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A touch panel, characterized in that: include: A substrate and a touch electrode layer provided on the substrate; The touch electrode layer includes: a plurality of electrode blocks arranged in rows and columns, wherein the electrode blocks located in the edge region of the substrate are edge electrode blocks, and the edge electrode blocks include incomplete electrode blocks having an area smaller than that of the electrode blocks located in the middle region of the substrate; Compensation electrodes corresponding one to one with the defective electrode blocks, the compensation electrodes and the defective electrode blocks being stacked, the defective electrode blocks being electrically connected to the compensation electrodes in each set of corresponding defective electrode blocks, and the orthographic projections of the compensation electrodes on the substrate falling within the orthographic projections of the defective electrode blocks on the substrate; In the mutually corresponding defective electrode block and compensation electrode, the sum of the area of ​​the compensation electrode and the area of ​​the defective electrode block is less than or equal to the area of ​​the electrode block in the central region of the substrate; The area of ​​the defective electrode block is less than or equal to one half of the area of ​​the electrode block in the central area of ​​the substrate, the orthographic projection of the compensation electrode on the substrate coincides with the orthographic projection of the defective electrode block on the substrate, the compensation electrode consists of at least two layers, at least two layers of the compensation electrodes are stacked, and the sum of the areas of all compensation electrodes and the area of ​​the defective electrode block is less than or equal to the area of ​​the electrode block in the central area of ​​the substrate.

2. The touch panel according to claim 1, wherein: The area of ​​the defective electrode block is larger than half of the area of ​​the electrode block in the central region of the substrate, and the area of ​​the compensation electrode is the same as the area of ​​the missing portion of the defective electrode block relative to the electrode block in the central region of the substrate.

3. The touch panel according to claim 1, wherein: The side of the compensation electrode facing the edge of the substrate is aligned with the side of the substrate.

4. The touch panel according to claim 1, wherein: In the mutually corresponding incomplete electrode blocks and compensation electrodes, an insulating layer is provided between the incomplete electrode blocks and the compensation electrodes, and the incomplete electrode blocks and the compensation electrodes are electrically connected via at least one via hole penetrating the insulating layer.

5. The touch panel according to any one of claims 1 to 4, wherein: The electrode blocks and the compensation electrodes both have a grid pattern.

6. The touch panel according to any one of claims 1 to 4, wherein: The plurality of electrode blocks distributed in rows and columns constitute first touch electrodes extending along a first direction and second touch electrodes extending along a second direction, wherein the first direction and the second direction are perpendicular to each other.

7. The touch panel according to claim 6, wherein: The electrode blocks are arranged in the same layer; two adjacent electrode blocks in the first touch electrodes are electrically connected, and two adjacent electrode blocks in the second touch electrodes are electrically connected via a bridge portion.

8. The touch panel according to claim 7, wherein: The compensation electrode and the bridge portion are arranged in the same layer.

9. The touch panel according to claim 6, wherein: The first touch electrode is located on the first conductive film layer, and the second touch electrode is located on the second conductive film layer; The compensation electrodes corresponding to the defective electrodes belonging to the first touch electrodes are located in the second conductive film layer, and the compensation electrodes corresponding to the defective electrodes belonging to the second touch electrodes are located in the first conductive film layer.

10. A display device, characterized in that: The invention comprises a touch panel as described in any one of claims 1 to 9.

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