Conductive thin film for touch panel, and grid pattern design method and manufacturing method thereof

Abstract

The invention discloses a conductive film for a touch panel, and a grid pattern design method and a manufacturing method thereof. According to one embodiment, the conductive film for the touch panel comprises a substrate and a first conductive layer located on the substrate, the orthographic projection of the first conductive layer on the substrate is provided with a first grid pattern, and the orthographic projection of the first conductive layer on the substrate is provided with a second grid pattern. The method for forming the first grid pattern comprises the following steps: generating a discrete point set in a design pattern corresponding to the design size of the conductive film, wherein the discrete point set comprises a plurality of discrete points positioned by coordinates; generating a Delaune triangulation network based on the discrete point set, wherein the Delaune triangulation network comprises a plurality of triangles shared by adjacent sides; a Thiessen polygon network is generated based on the Delaune triangulation network, a grid pattern of the Thiessen polygon network serves as the first grid pattern, and the Thiessen polygon network comprises a plurality of first polygons with adjacent sides sharing the same side. According to the grid pattern design, the compatibility with different display modules can be improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more specifically, to a conductive film for a touch panel, and a grid pattern design method and a manufacturing method thereof. Background Art

[0002] In recent years, various electronic devices, including mobile information devices, have been promoting the use of touch panels in combination with display devices such as liquid crystal display devices, and input operations to the electronic devices are performed by touching the screen. However, in order to achieve low cost and low resistance, touch panels using detection electrodes composed of metal grids have been developed.

[0003] The metal grid is formed by metal fine wires having a grid-like pattern. For example, detection electrodes composed of the metal grid are arranged on both surfaces of the transparent substrate. If the metal grid has a periodic pattern, the periodic pixel pattern of the display device used in combination with the touch panel interferes with the metal fine wires, and so-called moiré patterns are likely to occur. Summary of the invention

[0004] An object of the present invention is to provide a conductive film for a touch panel, a grid pattern design method and a manufacturing method thereof, so as to solve at least one of the problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A first aspect of the present invention provides a method for designing a grid pattern of a conductive film for a touch panel, wherein the conductive film for a touch panel comprises a substrate and a first conductive layer located on the substrate, wherein the first conductive layer has a first grid pattern in an orthographic projection of the substrate.

[0007] The method of forming the first grid pattern comprises:

[0008] Generating a discrete point set in a design pattern corresponding to the design size of the conductive film, the discrete point set comprising a plurality of discrete points located by coordinates;

[0009] generating a Delaunay triangulation network based on the discrete point set, wherein the Delaunay triangulation network includes a plurality of triangles shared by adjacent edges;

[0010] A Thiessen polygon network is generated based on the Delaunay triangulation network, and the grid pattern of the Thiessen polygon network is used as the first grid pattern. The Thiessen polygon network includes a plurality of first polygons with adjacent edges sharing the same edges.

[0011] In an optional embodiment, generating a discrete point set in a design pattern corresponding to a design size of the conductive film further comprises:

[0012] Splitting the design pattern into a tile array with tiles of preset side lengths;

[0013] A discrete point is randomly generated in the area of ​​each tile except the border and endpoints;

[0014] All discrete points are recorded in the form of coordinates to obtain a discrete point set, and the position information of each discrete point is recorded to obtain discrete point set data.

[0015] In an optional embodiment, generating a Delaunay triangulation network based on the discrete point set further comprises:

[0016] Construct multiple triangles using the three closest points in the discrete point set as vertices until all discrete points are used, the adjacent sides of two adjacent triangles share the same edge, the boundaries of different triangles do not intersect, and the boundaries of the outermost triangles are connected to form a closed convex polygon;

[0017] All triangles and the discrete points constituting the triangles are recorded to generate triangulated network data.

[0018] In an optional embodiment, the area of ​​the circumscribed circle of each triangle does not contain other discrete points.

[0019] In an optional embodiment, the number of Delaunay triangulations generated based on the discrete point set is 1.

[0020] In an optional embodiment, the distance from a vertex of the first polygon to a boundary of the first polygon opposite to the vertex or to another vertex of the first polygon opposite to the vertex is 250um-400um.

[0021] In an optional embodiment, the generating of a Thiessen polygon network based on the Delaunay triangulation network, using the mesh pattern of the Thiessen polygon network as the first mesh pattern, further comprises:

[0022] Determine the circumcenter of each triangle based on the triangulated network data;

[0023] The triangulated network data is traversed, and other adjacent triangles that share three sides with the triangle are searched based on a triangle, and the circumcenters of the other triangles found are connected to the circumcenter of the triangle used as the reference to generate the Voronoi edges of the Thiessen polygon network.

[0024] In an optional embodiment, the generating of the Thiessen polygon network based on the Delaunay triangulation network, using the mesh pattern of the Thiessen polygon network as the first mesh pattern, further comprises:

[0025] In the process of traversing the triangulated network data, if no other adjacent triangles sharing the three sides of the reference triangle can be found, then the perpendicular bisector of the side of the reference triangle is used as the Voronoi edge of the Thiessen polygon network.

[0026] In an optional embodiment, the touch panel further includes a second conductive layer located on a side of the first conductive layer away from the substrate and insulated from the first conductive layer, the orthographic projection of the second conductive layer on the substrate having a second grid pattern, the second grid pattern including a plurality of second polygons,

[0027] The method of forming the second grid pattern comprises:

[0028] Taking a decomposition point inside the first polygon as a vertex of the second polygon;

[0029] Connecting the decomposition points of two adjacent first polygons to form decomposition line segments as the boundaries of the second polygon, wherein the number of decomposition line segments corresponding to one decomposition point is less than or equal to the number of boundaries of the first polygon corresponding to the decomposition point;

[0030] Two decomposition line segments with the same decomposition point as endpoints are sequentially connected to form a closed second polygon, wherein in the orthographic projection on the base, the decomposition line segment intersects with at most one boundary of the first polygon.

[0031] In an optional embodiment, an intersection point between the decomposition line segment and a boundary of the first polygon is close to a corresponding midpoint of a boundary of the first polygon.

[0032] In an optional embodiment, the boundary of the first polygon and the boundary of the second polygon intersect to form a plurality of third polygons.

[0033] The distance between a vertex of the third polygon and a boundary of the third polygon opposite to the vertex or another vertex of the third polygon opposite to the vertex is 150um-450um.

[0034] A second aspect of the present invention provides a method for manufacturing a conductive film for a touch panel, wherein a first conductive layer is formed on a substrate, and an orthographic projection of a first metal wire of the first conductive layer on the substrate has the first grid pattern formed by the grid pattern design method of the first aspect of the present invention;

[0035] forming an insulating layer on a side of the first conductive layer away from the substrate;

[0036] A second conductive layer is formed on a side of the insulating layer away from the substrate, and a second metal line of the second conductive layer has a second grid pattern formed by the grid pattern design method according to the first aspect of the present invention on an orthographic projection of the substrate.

[0037] A third aspect of the present invention proposes a conductive film for a touch panel, comprising a substrate and a first conductive layer located on the substrate, wherein the orthographic projection of the first metal wire of the first conductive layer on the substrate has the first grid pattern formed by the grid pattern design method of the first aspect of the present invention, or the orthographic projection of the first metal wire of the first conductive layer on the substrate has the second grid pattern formed by the grid pattern design method of the first aspect of the present invention.

[0038] In an optional embodiment, the conductive film for the touch panel further includes an insulating layer located on a side of the first conductive layer away from the substrate, a second conductive layer located on a side of the insulating layer away from the substrate, and the second metal wire of the second conductive layer has a second grid pattern formed by the grid pattern design method of the first aspect of the present invention as an orthographic projection on the substrate; or, the second metal wire of the second conductive layer has a first grid pattern formed by the grid pattern design method described in the first aspect of the present invention as an orthographic projection on the substrate.

[0039] A fourth aspect of the present invention provides a display panel, the display panel comprising:

[0040] The display module comprises pixel units arranged in an array; and a touch panel formed by the conductive film for touch panel of the second aspect and the third aspect of the present invention.

[0041] The beneficial effects of the present invention are as follows:

[0042] The present invention proposes a design method for a grid pattern of a conductive film for a touch panel, and generates a first grid pattern based on the Voronoi diagram principle. The first grid pattern can avoid periodic optical interference with regularly arranged pixel units thereon when used with any liquid crystal display module, thereby avoiding the generation of moiré fringes and achieving a moiré-free effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0044] Figure 1 A schematic diagram showing the structure of a diamond patterned grid of the related art;

[0045] Figure 2 A schematic flow chart showing the steps of forming a first grid pattern according to an embodiment of the present invention;

[0046] Figure 3 A schematic flow chart showing step S1 of "generating a discrete point set in a design pattern corresponding to a design size of the conductive film" in an embodiment of the present invention;

[0047] Figure 4 A schematic diagram showing discrete points of a square-based design pattern according to an embodiment of the present invention;

[0048] Figure 5 A schematic diagram showing a Delaunay triangulation network according to an embodiment of the present invention;

[0049] Figure 6 A schematic diagram showing a Thiessen polygon network according to an embodiment of the present invention;

[0050] Figure 7 A schematic flow chart of step S5 of an embodiment of the present invention, "generating a Thiessen polygon network based on the Delaunay triangulation network, and using the mesh pattern of the Thiessen polygon network as the first mesh pattern" is shown;

[0051] Figure 8 A schematic diagram showing a structure of forming a first grid pattern according to an embodiment of the present invention;

[0052] Fig. 9 A schematic diagram showing the layer structure of a touch panel according to an embodiment of the present invention;

[0053] Fig.10 A schematic flow chart showing the steps of forming a second grid pattern according to an embodiment of the present invention;

[0054] Fig.11 A schematic structural diagram showing a first grid pattern and a second grid pattern formed according to an embodiment of the present invention;

[0055] Fig.12 The electrical performance test data obtained by testing the touch panel according to the above embodiment of the present invention are shown. DETAILED DESCRIPTION

[0056] In order to explain the present invention more clearly, the present invention is further described below in conjunction with embodiments and drawings. Similar components in the drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and the protection scope of the present invention should not be limited thereto.

[0057] In the related art, after the touch panel is attached to the liquid crystal display module, the display panel will show different degrees of moiré phenomenon after lighting, thus affecting the display effect. In order to improve this phenomenon, the related art has designed the following Figure 1 Diamond patterned grid design shown.

[0058] like Figure 1The diamond patterned grid design shown usually requires a certain amount of manpower, time and material costs, such as through software simulation and sample production for physical bonding to jointly screen out an optimal grid design for a specific angle and line spacing. However, the solution designed in this way often corresponds one-to-one to the matching liquid crystal pixels, so the compatibility is very poor. Once the pixel unit design of the display end of the liquid crystal display module is changed, or the number of matching display modules needs to be increased, the original patterned design scheme may not be able to match the new module display pixels, resulting in NG moiré patterns. Therefore, it is often necessary to re-screen the new grid scheme and remake the mask plate, which increases a lot of costs. On the other hand, when designing a new project, if it is impossible to obtain the physical module display panel and the grid pattern in time for bonding verification, there will still be a certain risk of moiré NG if only relying on software simulation. Therefore, the conventional diamond pattern design still has problems.

[0059] Based on experiments and research on the moiré problem, the inventors discovered that the moiré problem is caused by optical interference when the touch panel and the liquid crystal display module are bonded and lit. It is an optical phenomenon that can be captured by the naked eye due to periodic optical interference between the metal grid lines (including nodes) on the touch panel and the regularly arranged pixel units on the liquid crystal display module.

[0060] In view of this, the present invention provides a conductive film for a touch panel, a grid pattern design method, a manufacturing method and a display panel thereof to solve the above problems.

[0061] The first embodiment of the present invention provides a method for designing a grid pattern of a conductive film for a touch panel, such as Fig. 9 As shown, the conductive film for a touch panel includes a substrate 10 and a first conductive layer 11 located on the substrate 10, wherein the first conductive layer 11 has a first grid pattern in an orthographic projection of the substrate 10.

[0062] like Figure 2 As shown, the method of forming the first grid pattern includes:

[0063] S1, generating a discrete point set in a design pattern corresponding to a design size of the conductive film, the discrete point set comprising a plurality of discrete points 62 located by coordinates;

[0064] S3, generating a Delaunay triangulation network based on the discrete point set, wherein the Delaunay triangulation network includes a plurality of triangles shared by adjacent edges;

[0065] S5. Generate a Thiessen polygon network based on the Delaunay triangulation network, use the grid pattern of the Thiessen polygon network as the first grid pattern, and the Thiessen polygon network includes a plurality of first polygons with adjacent edges sharing the same edges.

[0066] The present invention proposes a design method for a grid pattern of a conductive film for a touch panel. A first grid pattern is generated based on the Voronoi diagram principle. The first grid pattern can avoid periodic optical interference with regularly arranged pixel units thereon when paired with any liquid crystal display module, thereby avoiding the generation of moiré fringes and achieving a moiré-free effect. The grid pattern design can improve compatibility with different display modules, and when facing the design of a new project, it can be realized without a physical module, which greatly shortens the project design time and improves customer satisfaction.

[0067] The grid pattern design method of the embodiment of the present invention is now described with a specific embodiment:

[0068] S1, generating a discrete point set in a design pattern corresponding to a design size of the conductive film, the discrete point set comprising a plurality of discrete points 62 located by coordinates;

[0069] In an optional embodiment, if Figure 3 As shown, step S1, generating a discrete point set in a design pattern corresponding to the design size of the conductive film, further comprises:

[0070] S11, splitting the design pattern into a block array with blocks of preset side lengths;

[0071] S13, randomly generate a discrete point 62 in the area of ​​each block except the border and the endpoint;

[0072] S15. Record all the discrete points 62 in the form of coordinates to obtain a discrete point set, and record the position information of each discrete point 62 to obtain discrete point set data.

[0073] The design pattern of this embodiment corresponds to the design size of the conductive film for the touch panel, for example, a rectangular structure, with a side length of ten units, the design pattern will be formed into a square array of m rows and n columns, and the square array will be designed with coordinates, such as abscissas and ordinates, and then a discrete point 62 can be randomly generated in each square (excluding endpoints and edges), and the coordinates of the discrete point 62 are recorded, thereby generating m*n random discrete point sets N corresponding to the number of tile arrays. For example, the discrete point set is as follows: Figure 4 shown.

[0074] S3, generating a Delaunay triangulation network based on the discrete point set, wherein the Delaunay triangulation network includes a plurality of triangles shared by adjacent edges;

[0075] In an optional embodiment, step S3 “generating a Delaunay triangulation network based on the discrete point set” further comprises:

[0076] S31. Construct multiple triangles using the three closest points in the discrete point set as vertices until all the discrete points 62 are used, the adjacent sides of two adjacent triangles share the same edge, the boundaries of different triangles do not intersect, and the boundaries of the outermost triangles are connected to form a closed convex polygon.

[0077] In this step, all discrete points 62 are used, and the boundaries of the multiple triangles formed do not intersect, so multiple triangles that share adjacent edges in sequence are formed, such as Figure 5 As shown, the outermost boundaries of the constructed multiple triangles form a raised pentagon. In an optional embodiment, the number of Delaunay triangulations generated according to the discrete point set is 1, that is, although the number of discrete points 62 in the discrete point set of the embodiment of the present invention is multiple, the number of generated Delaunay triangulations is unique. In other words, no matter where the construction starts from the region, a consistent result will be obtained in the end, that is, under a specific point set N, the Delaunay triangulation is unique.

[0078] In an optional embodiment, the area of ​​the circumscribed circle of each of the triangles does not contain any other discrete points 62, that is, the triangle has an empty circumscribed circle property, and in the Delaunay triangulation network composed of the point set N, the circumscribed circle of each triangle does not contain any other points in the point set N, that is, the circumscribed circle of any Delaunay triangle does not contain any other points.

[0079] S33, recording all triangles and the discrete points 62 constituting the triangles to generate triangulated network data.

[0080] Based on the above process, all discrete points 62 are used to form a Delaunay triangulation network, and the discrete points 62 and the formed triangles are numbered. It is recorded which three discrete points 62 each triangle is composed of, and the coordinates and numbers of the discrete points 62 are recorded as triangulation data.

[0081] S5, based on the Delaunay triangulation, generate Figure 6 The Thiessen polygon network shown uses the grid pattern of the Thiessen polygon network as the first grid pattern, and the Thiessen polygon network includes a plurality of first polygons 61 with adjacent edges sharing the same edges.

[0082] like Figure 6 The Thiessen polygon network shown includes a plurality of first polygons 61 , each of which is designed with a discrete point 62 , so that the designed pattern is decomposed into a plurality of mesh regions.

[0083] In an optional embodiment, if Figure 7As shown, step S5 "generating a Thiessen polygon network based on the Delaunay triangulation network, using the mesh pattern of the Thiessen polygon network as the first mesh pattern" further includes:

[0084] S51, determining the circumcenter of each triangle based on the triangulated network data. Exemplarily, the formula of the circumcenter can be determined by the coordinates and numbers of each triangle recorded in the above steps.

[0085] S53, traversing the triangulated network data, using a triangle as a reference to search for other adjacent triangles that share three sides with the triangle, and connecting the circumcenters of the other triangles found with the circumcenter of the triangle serving as the reference, so as to generate the Voronoi edges of the Thiessen polygon network.

[0086] In this step, the center of the circumscribed circle of each triangle is calculated using the triangulated network data obtained in the previous step. Since the Delaunay triangulation network includes multiple triangles, the center of the circumscribed circle of each triangle is confirmed one by one. Figure 5 As shown, if the current triangle is S, find the adjacent triangle that shares three sides with the current triangle S, for example Figure 5 The two adjacent sides of the middle triangle S have two adjacent triangles A and B.

[0087] Taking triangle A adjacent to triangle S as an example, the circumcenter of triangle A is connected to the circumcenter of triangle S to generate a Voronoi edge of the Thiessen polygon network. The Voronoi edge is located on both sides of the vertices of triangle A and triangle S, and the coordinate data of the endpoints of the Voronoi edge and the related numbers are stored.

[0088] In an optional embodiment, step S5 of "generating a Thiessen polygon network based on the Delaunay triangulation network, and using the mesh pattern of the Thiessen polygon network as the first mesh pattern" further includes:

[0089] S55. In the process of traversing the triangulated network data, if no other adjacent triangles that share three sides with the reference triangle can be found, then the perpendicular bisector of the side of the reference triangle is used as the Voronoi edge of the Thiessen polygon network.

[0090] like Figure 5 As shown, if the current triangle is S, only Figure 5There are triangles A and B adjacent to the current triangle S, that is, the current triangle S has only two sides that find adjacent triangles A and B. In this case, it means that there is no third triangle corresponding to the third side of the current triangle S, that is, the side is the outermost side of the Delaunay triangulation. For this outer side, the perpendicular ray of the side is calculated as a Voronoi edge of the Thiessen polygon network. Through the above process, not only the triangles in the non-edge area can be designed, but also the Voronoi edges of the triangles in the edge area can be designed, thereby realizing the grid patterning setting under the entire design area.

[0091] Based on the above process, the following is formed based on the Delaunay triangulation network and Voronoi diagram principle: Figure 8 The first grid pattern design shown can avoid periodic optical interference with regularly arranged pixel units thereon when used with any liquid crystal display module, thereby avoiding the generation of moiré fringes and achieving a moiré-free effect.

[0092] In an optional embodiment, the distance between a vertex of the first polygon 61 and a boundary of the first polygon 61 opposite to the vertex or to another vertex of the first polygon 61 opposite to the vertex is 250um-400um.

[0093] In an optional embodiment, the width of the lines corresponding to the first grid pattern design is 3 to 5 um. Taking the width of 3.5 um as an example, the ratio of the total area corresponding to the line width to the total area of ​​the entire design pattern, that is, the grid density is approximately 2.4%, and the patterned distribution is uniform.

[0094] In another optional embodiment, Fig. 9 As shown, the touch panel also includes a second conductive layer 12 located on a side of the first conductive layer 11 away from the substrate 10 and insulated from the first conductive layer 11, the second conductive layer 12 has a second grid pattern in the orthographic projection of the substrate 10, and the second grid pattern includes multiple second polygons.

[0095] The touch panel of the embodiment of the present invention is designed with a double conductive layer, and the first conductive layer 11 and the second conductive layer 12 are insulated. The superimposed metal grid pattern formed by the orthographic projection of the first conductive layer 11 and the second conductive layer 12 on the substrate 10 is evenly distributed at all angles. Under this structure, the embodiment of the present invention further designs the pattern of the second conductive layer.

[0096] In an optional embodiment, if Fig.10 As shown, the method of forming the second grid pattern includes:

[0097] S1001, taking a decomposition point 110 inside the first polygon 61 as a vertex of the second polygon;

[0098] In a specific example, if Fig.11 As shown, the decomposition point 110 of the present embodiment may be any point in the second polygon 111. Exemplarily, the decomposition point 110 is the approximate geometric center of each first polygon 61 in the first layer grid pattern design. The decomposition point 110 serves as the vertex of the second polygon 111 of the second grid pattern. Moreover, there is one and only one decomposition point 110 in the first polygon 61 of the first grid pattern as the vertex of the second polygon 111 of the second grid pattern.

[0099] S1003 , connecting the decomposition points 110 of two adjacent first polygons 61 to form decomposition line segments 112 as the boundaries of the second polygon 111 , wherein the number of decomposition line segments 112 corresponding to one decomposition point 110 is less than or equal to the number of boundaries of the first polygon 61 corresponding to this decomposition point 110 .

[0100] In the embodiment of the present invention, Fig.11 As shown, a decomposition point 110 is connected to multiple adjacent decomposition points 110 to form multiple decomposition line segments 112, that is, one decomposition point 110 corresponds to multiple decomposition line segments 112, and each decomposition line segment 112 extends to other decomposition points 110 with the decomposition point 110 as the center. The embodiment of the present invention designs the number of decomposition line segments 112 corresponding to a decomposition point 110. In this embodiment, the multiple decomposition line segments 112 corresponding to a decomposition point 110 divide the first polygon 61 where the decomposition is located into approximately equal parts of 3 to 5, so that the distribution of the second grid pattern is more uniform.

[0101] In a specific example, if Fig.11 As shown, the decomposition point 110C is located inside the pentagon E, and the decomposition point 110C corresponds to four decomposition line segments 112 . In this example, the number of decomposition line segments 112 corresponding to the decomposition point 110C is the same as the number of boundaries of the pentagon E corresponding to the decomposition point 110 .

[0102] Based on the same principle, the number of decomposition line segments 112 corresponding to a decomposition point 110 described in the embodiment of the present invention is less than or equal to the number of first polygons 61 corresponding to the decomposition point 110. On the basis of equally dividing the area of ​​the first polygon 61, the uniformity of area division is further ensured, and the uniformity of the overall grid density is further ensured.

[0103] S1005 , sequentially connecting two decomposition line segments 112 with the same decomposition point 110 as endpoints to form a closed second polygon 111 , wherein in the orthographic projection on the base 10 , the decomposition line segment 112 intersects with at most one boundary of the first polygon 61 .

[0104] In an optional embodiment, if Fig.11As shown, when two decomposition line segments 112 have the same decomposition point 110, the two decomposition line segments 112 are used as adjacent boundaries of the second polygon 111 of the second grid pattern. After multiple adjacent boundaries are connected in sequence, a closed second polygon 111 is formed, as shown in FIG. Fig.11 As shown, the second polygons 111 are convex polygons, and adjacent second polygons 111 share adjacent sides to form a closely arranged second grid pattern.

[0105] In an optional embodiment, the intersection point of the decomposition line segment 112 and a boundary of the first polygon 61 is close to the midpoint of a boundary of the first polygon 61. In other words, the orthographic projections of the first polygon 61 and the second polygon 111 on the base 10 have an intersection point, and the intersection point is close to the middle position of the boundary of the first polygon 61.

[0106] Through the above process, the embodiment of the present invention designs the second pattern based on the first grid pattern, thereby forming the following Fig.11 In the double-layer grid pattern design, in an optional embodiment, the boundary of the first polygon 61 and the boundary of the second polygon 111 intersect to form multiple third polygons, and the distance between the vertex of the third polygon to the boundary of the third polygon opposite to the vertex or to another vertex of the third polygon opposite to the vertex is 150um-450um.

[0107] Based on the design of the above-mentioned first grid pattern and the second grid pattern, the first polygon 61 and the second polygon 111 intersect to form multiple third polygons. The third polygons are formed by the first polygon 61 and the second polygon 111 with larger areas. Therefore, the area of ​​the third polygon is smaller than that of the first polygon 61 and the second polygon 111.

[0108] The size of the third polygon described in the embodiment of the present invention is the distance from one vertex to the relative boundary of the vertex, or the distance from one vertex to another vertex, which is designed to be 150um-450um. Based on the above settings, the embodiment of the present invention can achieve a grid density of about 2.4% for the third polygon formed under a design of a line width of 3.5um. The double-layer grid pattern has a better grid density, better grid size uniformity, better display effect, and the electrical requirements of the touch panel formed using the double-layer grid pattern are also more stable.

[0109] Another embodiment of the present invention provides a method for manufacturing a conductive film for a touch panel, the method comprising:

[0110] A first conductive layer 11 is formed on a substrate 10, wherein an orthographic projection of a first metal line of the first conductive layer 11 on the substrate 10 has the first grid pattern formed by the grid pattern design method of the above embodiment of the present invention;

[0111] forming an insulating layer on a side of the first conductive layer 11 away from the substrate 10;

[0112] A second conductive layer 12 is formed on a side of the insulating layer away from the substrate 10 , and the orthographic projection of the second metal wire of the second conductive layer 12 on the substrate 10 has a second grid pattern formed by the grid pattern design method of the above embodiment of the present invention.

[0113] The manufacturing method of the embodiment of the present invention does not add complicated process steps, has good grid uniformity, and has a good display effect. The electrical requirements of the touch panel formed by the double-layer grid pattern are also more stable.

[0114] Another embodiment of the present invention provides a conductive film for a touch panel, the conductive film for a touch panel comprising a substrate 10 and a first conductive layer 11 located on the substrate 10, wherein, in one embodiment, the orthographic projection of the first metal wire of the first conductive layer 11 on the substrate 10 has the first grid pattern formed by the grid pattern design method of the above embodiment of the present invention.

[0115] In another embodiment, the first mesh pattern of the embodiment of the present invention is not limited to being implemented by the above-mentioned mesh pattern design method. The first mesh pattern of this implementation example is designed based on the realization of the following structural features: the first mesh pattern is a Thiessen polygon network, the Thiessen polygon network includes a plurality of first polygons with shared adjacent edges, each of the first polygons includes a discrete point in the design pattern corresponding to the design size of the conductive film, and the discrete point set composed of all the discrete points forms a Delaunay triangulation network, and the Delaunay triangulation network includes a plurality of triangles with shared adjacent edges composed of the three closest discrete points. Therefore, the technical solution that can realize this structural feature is also within the protection scope of the embodiment of the present invention.

[0116] When the conductive film for touch panel has a double conductive layer structure, in an optional embodiment, the conductive film for touch panel further includes an insulating layer located on a side of the first conductive layer 11 away from the substrate 10 , and a second conductive layer 12 located on a side of the insulating layer away from the substrate 10 .

[0117] In one embodiment, the orthographic projection of the second metal wires of the second conductive layer 12 on the substrate 10 has a second mesh pattern formed by the mesh pattern design method of the above embodiment of the present invention.

[0118] Based on the discussion of the first grid pattern, in another embodiment, the second grid pattern of the embodiment of the present invention is not limited to being implemented by the second grid pattern design method described above. The second grid pattern of this implementation example is designed based on the following structural features: the second grid pattern includes a plurality of first polygons with adjacent edges sharing a common edge, each vertex of the second polygon is a decomposition point inside a different first polygon, the boundary of the second polygon is a decomposition line segment formed by the line connecting the decomposition points of two adjacent first polygons, the number of decomposition line segments corresponding to a decomposition point is less than or equal to the number of boundaries of the first polygon corresponding to the decomposition point, and the decomposition line segment intersects with at most one boundary of the first polygon. Therefore, the technical solution that can achieve this structural feature is also within the protection scope of the embodiment of the present invention.

[0119] It is worth noting that the relevant structural features of the first grid pattern and the second grid pattern in the grid pattern design method of the aforementioned embodiment are also applicable to the structural features of the first conductive layer and the second conductive layer formed by the conductive film for the touch panel of this embodiment, and the relevant parts can be referenced.

[0120] The double-layer conductive structure of the conductive film for the touch panel in the embodiment of the present invention does not add complicated process steps, has good grid uniformity, and has a good display effect. The electrical requirements of the touch panel formed by the double-layer grid pattern are also more stable.

[0121] Another embodiment of the present invention provides a display panel, the display panel comprising:

[0122] The display module comprises pixel units arranged in an array and a touch panel formed by the conductive film used for the touch panel of the above embodiment of the present invention.

[0123] The touch panel of the embodiment of the present invention has a first grid pattern and a second grid pattern, which can avoid periodic optical interference with regularly arranged pixel units thereon when paired with any liquid crystal display module, thereby avoiding the generation of moiré fringes and achieving a moiré-free effect. The grid pattern design can improve compatibility with different display modules, and when facing the design of new projects, it can be achieved without physical modules, which greatly shortens the project design time and improves customer satisfaction.

[0124] In the description of the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0125] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A method for designing a grid pattern of a conductive film for a touch panel, characterized in that: The conductive film for a touch panel includes a substrate and a first conductive layer located on the substrate, wherein the first conductive layer has a first grid pattern in an orthographic projection of the substrate. The method of forming the first grid pattern comprises: Generating a discrete point set in a design pattern corresponding to the design size of the conductive film, the discrete point set comprising a plurality of discrete points located by coordinates; generating a Delaunay triangulation network based on the discrete point set, wherein the Delaunay triangulation network includes a plurality of triangles shared by adjacent edges; A Thiessen polygon network is generated based on the Delaunay triangulation network, and the grid pattern of the Thiessen polygon network is used as the first grid pattern. The Thiessen polygon network includes a plurality of first polygons with adjacent edges sharing the same edges.

2. The grid pattern design method according to claim 1, characterized in that: The step of generating a discrete point set in a design pattern corresponding to the design size of the conductive film further comprises: Splitting the design pattern into a tile array with tiles of preset side lengths; A discrete point is randomly generated in the area of ​​each tile except the border and endpoints; All discrete points are recorded in the form of coordinates to obtain a discrete point set, and the position information of each discrete point is recorded to obtain discrete point set data.

3. The grid pattern design method according to claim 1, characterized in that: The generating of the Delaunay triangulation network based on the discrete point set further comprises: Construct multiple triangles using the three closest points in the discrete point set as vertices until all discrete points are used, the adjacent sides of two adjacent triangles share the same edge, the boundaries of different triangles do not intersect, and the boundaries of the outermost triangles are connected to form a closed convex polygon; All triangles and the discrete points constituting the triangles are recorded to generate triangulated network data.

4. The grid pattern design method according to claim 3, characterized in that: The area of ​​the circumscribed circle of each triangle does not contain other discrete points.

5. The grid pattern design method according to claim 3, characterized in that: The number of Delaunay triangulations generated according to the discrete point set is 1.

6. The grid pattern design method according to claim 1, characterized in that: The distance between a vertex of the first polygon and a boundary of the first polygon opposite to the vertex or another vertex of the first polygon opposite to the vertex is 250um-400um.

7. The grid pattern design method according to claim 3, characterized in that: The method of generating a Thiessen polygon network based on the Delaunay triangulation network and using the mesh pattern of the Thiessen polygon network as the first mesh pattern further includes: Determine the circumcenter of each triangle based on the triangulated network data; The triangulated network data is traversed, and other adjacent triangles that share three sides with the triangle are searched based on a triangle, and the circumcenters of the other triangles found are connected to the circumcenter of the triangle used as the reference to generate the Voronoi edges of the Thiessen polygon network.

8. The grid pattern design method according to claim 7, characterized in that: The method of generating a Thiessen polygon network based on the Delaunay triangulation network and using the mesh pattern of the Thiessen polygon network as the first mesh pattern further includes: In the process of traversing the triangulated network data, if no other adjacent triangles sharing the three sides of the reference triangle can be found, then the perpendicular bisector of the side of the reference triangle is used as the Voronoi edge of the Thiessen polygon network.

9. The grid pattern design method according to any one of claims 1 to 8, characterized in that: The touch panel further includes a second conductive layer located on a side of the first conductive layer away from the substrate and insulated from the first conductive layer, wherein the orthographic projection of the second conductive layer on the substrate has a second grid pattern, and the second grid pattern includes a plurality of second polygons. The method of forming the second grid pattern comprises: Taking a decomposition point inside the first polygon as a vertex of the second polygon; Connecting the decomposition points of two adjacent first polygons to form decomposition line segments as the boundaries of the second polygon, wherein the number of decomposition line segments corresponding to one decomposition point is less than or equal to the number of boundaries of the first polygon corresponding to the decomposition point; Two decomposition line segments with the same decomposition point as endpoints are sequentially connected to form a closed second polygon, wherein in the orthographic projection of the second grid pattern on the substrate, the decomposition line segment intersects with at most one boundary of the first polygon.

10. The grid pattern design method according to claim 9, characterized in that: An intersection point between the decomposed line segment and a boundary of the first polygon is close to a corresponding midpoint of the boundary of the first polygon.

11. The grid pattern design method according to claim 9, characterized in that: The boundary of the first polygon and the boundary of the second polygon intersect to form a plurality of third polygons, The distance between a vertex of the third polygon and a boundary of the third polygon opposite to the vertex or another vertex of the third polygon opposite to the vertex is 150um-450um.

12. A method for manufacturing a conductive film for a touch panel, characterized in that: forming a first conductive layer on a substrate, wherein an orthographic projection of a first metal line of the first conductive layer on the substrate has the first mesh pattern formed by the mesh pattern design method according to any one of claims 1 to 8; forming an insulating layer on a side of the first conductive layer away from the substrate; A second conductive layer is formed on a side of the insulating layer away from the substrate, and a second metal line of the second conductive layer has a second mesh pattern formed by the mesh pattern design method according to any one of claims 9 to 11 in an orthographic projection on the substrate.

13. A conductive film for a touch panel, characterized in that: The conductive film for a touch panel includes a substrate and a first conductive layer located on the substrate, wherein: The orthographic projection of the first metal line of the first conductive layer on the substrate has the first grid pattern, Among them, the first grid pattern is a Thiessen polygon network, which includes a plurality of first polygons with shared adjacent edges, each of which includes a discrete point in the design pattern corresponding to the design size of the conductive film, and a discrete point set composed of all discrete points forms a Delaunay triangulation network, and the Delaunay triangulation network includes a plurality of triangles with shared adjacent edges formed by the three discrete points closest to each other.

14. The conductive film for a touch panel according to claim 13, wherein: The conductive film for a touch panel further includes an insulating layer located on a side of the first conductive layer away from the substrate, a second conductive layer located on a side of the insulating layer away from the substrate, and a second metal line of the second conductive layer has a second grid pattern on an orthographic projection of the substrate. The second grid pattern includes multiple first polygons with adjacent sides and common edges, each vertex of the second polygon is a decomposition point inside a different first polygon, the boundary of the second polygon is a decomposition line segment formed by the line connecting the decomposition points of two adjacent first polygons, the number of decomposition line segments corresponding to a decomposition point is less than or equal to the number of boundaries of the first polygon corresponding to this decomposition point, and the decomposition line segment intersects with at most one boundary of the first polygon.

15. A display panel, characterized in that: The display panel comprises: A display module, comprising pixel units arranged in an array; and A touch panel comprising the conductive film for a touch panel according to any one of claims 13 or 14.

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