Display substrate and display device

Abstract

The invention discloses a display substrate and a display device. The display substrate comprises a touch area, a frame area and a touch electrode wire. The touch area comprises a plurality of touch electrodes. The frame area comprises a touch control chip. The touch electrode wires are connected with the touch electrodes and the touch chip, and at least part of the touch electrode wires are arranged in the touch area. According to the display panel, part of the touch electrode wires are arranged in the touch area, the number of the touch electrode wires in the frame area is reduced, the frame area can be arranged to be narrower, and therefore the narrow frame of the display panel can be achieved.

Description

Technical Field

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

[0002] With the development of science and technology, display panels with touch function (touch screens) have been increasingly widely used.

[0003] Display panels typically consist of a touch area and a border area. The touch area is used to set up the touch capacitor, while the border area is used to set up the wiring connecting the IC and the touch capacitor. With the development of full-screen displays, the screen border requirements are becoming increasingly narrow, which poses a challenge to the wiring design of display panels. Summary of the Invention

[0004] The purpose of the present application is to provide a display substrate and a display device with a narrow frame.

[0005] The present application discloses a display substrate, comprising:

[0006] A touch area, comprising a plurality of touch electrodes;

[0007] Border area, including the touch chip;

[0008] Touch electrode wiring, the touch electrode wiring connects the touch electrode and the touch chip, and at least part of the touch electrode wiring is arranged in the touch area.

[0009] In an optional embodiment, the touch area is provided with a metal grid structure, part of the metal grid constitutes a part of the touch electrode, and part of the metal grid located at the edge of the touch area constitutes a part of the touch electrode routing.

[0010] In an optional embodiment, a portion of the metal grid that is less than or equal to 2000 micrometers away from the edge of the touch area constitutes a portion of the touch electrode trace.

[0011] In an optional embodiment, the touch electrodes are divided into a plurality of first touch electrodes extending along a first direction and a plurality of second touch electrodes extending along a second direction, the plurality of first touch electrodes are arranged along the second direction, and the plurality of second touch electrodes are arranged along the first direction; the first direction intersects the second direction.

[0012] The touch electrode wiring includes a first touch electrode wiring connected to the first touch electrode and a second touch electrode wiring connected to the second touch electrode; a first shielding wire is provided between the first touch electrode wiring and the second touch electrode wiring.

[0013] In an optional embodiment, the touch electrode trace includes a touch segment formed of a metal mesh and a frame segment connecting the touch segment and the touch chip; a second shielding line formed of the metal mesh is provided between the touch segment and the touch electrode.

[0014] In an optional embodiment, the display substrate includes:

[0015] basal layer;

[0016] a first metal layer, located on one side of the base layer;

[0017] a first insulating layer, located on a side of the first metal layer away from the base layer;

[0018] The second metal layer is located on a side of the first insulating layer away from the first metal layer, and the metal grid is located on the second metal layer.

[0019] In an optional embodiment, the touch segment is bridged to the touch electrode through a wiring of the first metal layer.

[0020] In an optional embodiment, the first shielding wire is connected to the second shielding wire through a winding of the first metal layer.

[0021] In an optional embodiment, the metal grid includes a plurality of meshes, and the width of the second shielding line is greater than or equal to the width of the meshes.

[0022] In an optional embodiment, the metal grid is provided with a plurality of fractures to insulate the touch electrode traces from the touch electrodes; the metal grid includes a plurality of meshes, and a plurality of fractures are provided on one side of the meshes.

[0023] In an optional embodiment, the width of the fracture is greater than or equal to 4 microns and less than or equal to 6 microns.

[0024] The present application also discloses a display device, which includes the above-mentioned display substrate.

[0025] Compared with the related art, the present application reduces the number of touch electrode lines in the frame area by setting part of the touch electrode lines in the touch area, so that the frame area can be set narrower, thereby enabling the display panel to achieve a narrow frame.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0028] Figure 1 FIG. 1 is a schematic structural diagram of a display substrate in an embodiment of the present application.

[0029] Figure 2 In one embodiment of this application Figure 1 Schematic diagram of the enlarged X region in the middle.

[0030] Figure 3 In one embodiment of this application, Figure 2 Schematic diagram of the cross section along line BB.

[0031] Figure 4 In one embodiment of this application, Figure 2 Schematic diagram of the cross section along line AA.

[0032] Figure 5 In one embodiment of this application, Figure 2 Schematic diagram of the cross section along the CC line.

[0033] Figure 6 In one embodiment of this application Figure 1 Schematic diagram of partial structure enlargement of the D area in the middle.

[0034] Explanation of the accompanying drawings: touch area, 1000; touch electrode, 100; first touch electrode, 110; second touch electrode, 120; frame area, 2000; touch electrode trace, 200; first touch electrode trace, 210; first frame segment, 211; first touch segment, 212; second touch electrode trace, 220; second frame segment, 221; second touch segment, 222; shielding line, 300; first shielding line, 310; second shielding line, 320; connecting segment, 330; bridging line, 400; touch chip, 500; base layer, 10; first metal layer, 20; via, 21; first organic insulating layer, 30; second metal layer, 40; second organic insulating layer, 50. DETAILED DESCRIPTION

[0035] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0036] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0037] like Figure 1 As shown, the present application provides a display substrate, which includes a touch area 1000 and a frame area 2000. The touch area 1000 includes a plurality of touch electrodes 100. The frame area 2000 includes a touch chip 500. The display panel also includes touch electrode traces 200, which are used to connect the touch electrodes 100 and the touch chip 500. At least some of the touch electrode traces 200 are disposed in the touch area 1000.

[0038] The present application reduces the number of touch electrode lines in the frame area by setting some touch electrode lines in the touch area, so that the frame area can be set narrower, thereby enabling the display panel to achieve a narrow frame.

[0039] The following will describe in detail the various embodiments of the present application that are consistent with the above-mentioned creative concepts.

[0040] like Figure 1 as well as Figure 3 As shown, the display substrate may include a base layer 10, a first metal layer 20, a first insulating layer 30, a second metal layer 40, and a second insulating layer 50 in its thickness direction. The first metal layer 20 is located on one side of the base layer 10. Specifically, the first metal layer 20 may be located on the side of the base layer 10 close to the light-emitting side of the display substrate. The first insulating layer 30 is located on the side of the first metal layer 20 away from the base layer 10. The second metal layer 40 is located on the side of the first insulating layer 30 away from the first metal layer 20. The second insulating layer 50 is located on the side of the second metal layer 40 away from the first insulating layer 30. The base layer 10, the first insulating layer 30, and the second insulating layer 50 may be made of a flexible material, such as PI (Polyimide), PC (Polycarbonate), or a light-curable flexible resin. In this way, the display substrate can have better bending performance.

[0041] The first metal layer 20 and the second metal layer 40 can be made of a transparent conductive material such as indium tin oxide (ITO). Alternatively, the first metal layer 20 and the second metal layer 40 can be made of a low-resistance metal material (such as silver, aluminum, copper, molybdenum, niobium or their alloys). In the embodiment of the present application, the first metal layer 20 and the second metal layer 40 are made of a low-resistance metal material as an example. Specifically, the first metal layer 20 and the second metal layer 40 can include a first titanium metal layer, an aluminum metal layer and a second titanium metal layer from close to the base layer 10 to away from the base layer 10, wherein the thickness of the aluminum metal layer is greater than the thickness of the first titanium metal layer and the second titanium metal layer. In other optional embodiments, the first titanium metal layer and the second titanium metal layer can be selectively replaced with a nickel metal layer, etc., and the aluminum metal layer can be selectively replaced with a gold metal layer, a silver metal layer or a copper metal layer, etc.

[0042] The display substrate may include a touch area 1000 and a frame area 2000. The touch area 1000 corresponds to the display area of the display panel. The touch area 1000 includes a plurality of touch electrodes 100. The plurality of touch electrodes 100 are divided into first touch electrodes 110 extending along a first direction F1 and second touch electrodes 120 extending along a second direction F2. The plurality of first touch electrodes 110 are arranged along the second direction F2, and the plurality of second touch electrodes 120 are arranged along the first direction F1. The first direction F1 intersects the second direction F2. Specifically, the first direction F1 may be the length direction of the display panel, and the second direction F2 may be the width direction of the display panel. Of course, the first direction F1 may also be a direction that deviates by several degrees from the length direction of the display panel, and the second direction F2 may be a direction that deviates by several degrees from the width direction of the display panel. In some foldable screen display devices, the first direction F1 may also be the width direction of the display panel, and the second direction F2 may also be the length direction of the display panel, etc. One of the first touch electrode 110 and the second touch electrode 120 is a drive electrode, and the other is a sensing electrode. The intersection of the two electrodes forms a capacitor. Each drive electrode is scanned with a drive signal, and a corresponding sensing signal is generated on the sensing electrode. When a touch occurs, a person or a stylus approaches the touch area, affecting the capacitance between the two electrodes in that area. This changes the sensing signal on the corresponding sensing electrode, thereby determining the touch location.

[0043] The first touch electrode 110 can be disposed on either the first metal layer 20 or the second metal layer 40, and the second touch electrode 120 can also be disposed on either the first metal layer 20 or the second metal layer 40. At the intersection of the first touch electrode 110 and the second touch electrode 120, the first touch electrode 110 and the second touch electrode 120 are located in different film layers to form a touch capacitor. For example, the main bodies of the first touch electrode 110 and the second touch electrode 120 can both be disposed on the second metal layer 40, and at the intersection, the second touch electrode 120 can be routed to the first metal layer 20 to form a touch capacitor.

[0044] In the touch area 1000, because the metal is opaque, the first metal layer 20 or the second metal layer 40 is a dense metal grid structure. The mesh of the metal grid avoids the light-emitting openings of the display substrate sub-pixels in the thickness direction of the display substrate, so that the metal layer does not affect the normal light emission of the display substrate. The width of the metal wires in the metal grid can be greater than or equal to 2 microns and less than or equal to 4 microns. For example, the width of the metal wires can be 2, 2.5, 3, 3.2, or 4 microns. The interior of the metal grid is cut by etching or other methods to form a plurality of first touch electrodes 110 and a plurality of second touch electrodes 120. In the embodiment of the present application, the second metal layer 40 is a dense metal grid structure, the first touch electrodes 110 and a portion of the second touch electrodes 120 are arranged in the second metal layer 40, and the second touch electrodes 120 are wound to the first metal layer 20 at the intersection of the first touch electrodes 110 and the second touch electrodes 120.

[0045] like Figures 1 to 3 As shown, the border area 2000 is provided with a touch chip 500. Specifically, the touch chip 500 is provided on one side of the border area 2000 along the second direction F2. The display substrate also includes a plurality of touch electrode traces 200, which respectively connect the plurality of touch electrodes 100 and the touch chip 500. In the embodiment of the present application, each touch electrode 100 is connected to the touch chip 500 via a touch electrode trace 200. Among them, the first touch electrode trace 210 connects the first touch electrode 110 and the touch chip 500, and the second touch electrode trace 220 connects the second touch electrode 120 and the touch chip 500. The connection between the first touch electrode 110 and the first touch electrode trace 210 is located on opposite sides of the touch area 1000 along the first direction F1. Optionally, from closer to the touch chip 500 to farther away from the touch chip 500, the connection between the odd-numbered first touch electrodes 110 and the first touch electrode traces 210 is located on one side along the first direction F1, and the connection between the even-numbered first touch electrodes 110 and the first touch electrode traces 210 is located on the other side along the first direction F1. The connection between the second touch electrodes 120 and the second touch electrode traces 220 is located on the side of the touch area 1000 closer to the touch chip 500 along the second direction F1.

[0046] At least some of the touch electrode traces 200 are disposed within the touch area 1000. Optionally, the touch area 1000 is densely covered with a metal mesh structure, with some of the metal mesh forming part of the touch electrodes 100, and some of the metal mesh located at the edge of the touch area 1000 forming part of the touch electrode traces 200. Optionally, some of the metal mesh that is less than or equal to 2000 microns from the edge of the touch area 1000 forms part of the touch electrode traces 200. Given that the accuracy of human finger recognition is above 3500 microns, selecting a metal mesh that is less than or equal to 2000 microns from the edge of the touch area 1000 to form part of the touch electrode traces 200 does not affect the normal touch function of the touch area 1000.

[0047] like Figure 1 and Figure 2 As shown, Figure 2 for Figure 1 An enlarged schematic diagram of the X region in the center. The touch electrode trace 200 includes touch segments formed of a metal mesh and a frame segment connecting the touch segments to the touch chip 500. Specifically, the first touch electrode trace 210 includes a first frame segment 211 and a first touch segment 212, and the second touch electrode trace 220 includes a second frame segment 221 and a second touch segment 222. The first touch segments 212 and the second touch segments 222 are both formed of a metal mesh. Breaks 600 are provided between adjacent first touch segments 212, first touch segments 212 and second touch segments 222, and second touch segments 222 to insulate them from each other. The width of the metal mesh occupied by the first touch segments 212 and the second touch segments 222 can be determined based on actual needs, as long as it is less than or equal to 2000 microns from the edge of the touch area 1000 and can form a conductive path.

[0048] In the frame area 2000, the first frame segment 211 and the second frame segment 221 can both adopt a double-layer routing structure. Specifically, routing is provided on both the first metal layer 20 and the second metal layer 40, and the projections of the routing located in the first metal layer 20 and the second metal layer 40 in the thickness direction of the display substrate overlap. In the touch area 1000, the first touch segment 212 and the second touch segment 222 can both adopt a single-layer routing structure. Specifically, it is only provided at the level where the metal grid is located. The metal grid is provided with a number of fractures 600 to insulate the touch electrode routing 200 from the touch electrode 100. The touch electrode routing 200 can be connected to the corresponding touch electrode 100 by winding through the first metal layer 20.

[0049] like Figure 1 as well as Figure 2As shown, in an optional embodiment, the display substrate further includes a shielding line 300. The shielding line 300 is located between the first touch electrode trace 210 and the second touch electrode trace 220, and between the touch electrode trace 200 and the touch electrode 100. The shielding line 300 is grounded or connected to a constant voltage source. The shielding line 300 can shield interference between the first touch electrode trace 210 and the second touch electrode trace 220, and can also shield interference between the touch electrode trace 200 and the touch electrode 100.

[0050] Specifically, the shielding wire 300 includes a first shielding wire 310 and a second shielding wire 320. The first shielding wire 310 is located in the frame area 2000. The first shielding wire 310 is disposed between the first frame segment 211 and the second frame segment 221 to shield interference between the first frame segment 211 and the second frame segment 221.

[0051] The second shielding line 320 is located in the touch area 1000 and is formed from a portion of a metal mesh. The second shielding line 320 is disposed between the first touch segment 212 and the touch electrode 100, and between the second touch segment 222 and the touch electrode 100, to shield interference between the first and second touch segments 212, 222, and the touch electrode 100. The first shielding line 310 is connected to the second shielding line 320 via a winding through the first metal layer 20. Specifically, the first shielding line 310 and the second shielding line 320 can be connected via a connecting segment 330. The connecting segment 330 is also formed from a metal mesh. The connecting segment 330 can be directly connected to the second shielding line 320 on the same layer, i.e., there is no interruption between the connecting segment 330 and the second shielding line 320. Alternatively, the connecting segment 330 can be interrupted between the connecting segment 330 and the second shielding line 320, and the connecting segment 330 can be connected to the second shielding line 320 via a winding through the first metal layer 20.

[0052] The metal mesh of the touch area 1000 is divided by a first cutoff line CUT1 and a second cutoff line CUT2. The first cutoff line CUT1 and the second cutoff line CUT2 are substantially parallel, with the second cutoff line CUT2 located outside the first cutoff line CUT1. The portion inside the first cutoff line CUT1 constitutes the touch electrode 100, the portion between the first and second cutoff lines CUT1 and CUT2 constitutes the second shielding line 320, and the portion outside the second cutoff line CUT2 constitutes the first touch segment 212, the second touch segment 222, and the connecting segment 330. The distance between the first and second cutoff lines CUT1 and CUT2 is greater than or equal to the width of the mesh of the metal mesh. That is, the width of the second shielding line 320 is greater than or equal to the width of the mesh.

[0053] Since the second shielding line 320 isolates the first touch segment 212, the second touch segment 222 from the touch electrode 100, the first touch segment 212, the second touch segment 222 can be connected to the touch electrode 100 through the bridge segment 400, wherein the bridge segment 400 is located in the first metal layer 20. Specifically, as Figures 2 to 5 As shown, the connection between the second touch segment 222 and the corresponding touch electrode 100 is taken as an example. Figure 4 for Figure 2 In the cross-sectional view along line AA, at line AA, the second touch segment 222 is connected to the bridge segment 400 located in the first metal layer 20 through the via 21 . Figure 3 for Figure 2 In the cross-sectional diagram along line BB, at BB, the bridge segment 400 and the second shielding line 320 are insulated from each other. When the bridge segment 400 extends from the outside of the second truncation line CUT2 to the inside of the first truncation line CUT1, the bridge segment 400 is connected to the corresponding touch electrode 100 through the via 21 in the same manner as at AA. In this way, the second touch segment 222 is connected to the touch electrode 100 by winding the wire through the first metal layer 20. The first touch segment 212 can also be connected to the touch electrode 100 by winding the wire through the first metal layer 20 in the same manner, which will not be elaborated here. Figure 3 As shown, the bridging section 400 can overlap with the second shielding line 320 in its orthographic projection in the thickness direction of the display substrate. In this way, the bridging section 400 can also avoid the light-emitting openings of the sub-pixels of the display substrate, thereby not affecting the normal light emission of the display substrate.

[0054] like Figure 2 and Figure 5 As shown, Figure 5 for Figure 2 At CC, the display substrate is not provided with the bridge section 400 , so only the second metal layer 40 is provided with the second shielding line 320 .

[0055] like Figure 6 As shown, Figure 6 for Figure 2An enlarged schematic diagram of the D area in the middle. In this area, the first truncation line CUT1 cuts off the touch electrode 100 and the second shielding line 320. In an optional embodiment, the first truncation line CUT1 can cut out a plurality of breaks 600 on the same metal grid line. Specifically, the metal grid includes a plurality of meshes, and the meshes can be triangular, quadrilateral, pentagonal or other special-shaped meshes. In the embodiment of the present application, taking the mesh as a quadrilateral mesh as an example, a plurality of breaks 600 are provided on the same side of the mesh. In this way, the first truncation line CUT1 can fully cut off the redundant area of the metal grid, effectively reduce the load of the effective routing in the metal grid, and also reduce the influence of the metal grid on the light output of the sub-pixel. Optionally, the width d of the break 600 can be greater than or equal to 4 microns and less than or equal to 6 microns, for example, it can be 4, 4.5, 4.8, 5 or 6 microns, etc. In the embodiment of the present application, the breaks 600 of all metal grids can be set in the above manner to improve the performance of the display substrate.

[0056] In order to solve the above technical problems, the present application further provides a display device, which includes the above display panel.

[0057] In one embodiment, the display device further includes a housing, and the display panel is disposed in the housing.

[0058] The display device provided in the embodiments of the present application may be, for example, a mobile phone, a tablet computer, a television, a laptop computer, an in-vehicle device, or any other device with a display function.

[0059] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A display substrate, characterized in that: The display substrate comprises: A touch area, comprising a plurality of touch electrodes; Border area, including the touch chip; Touch electrode wiring, the touch electrode wiring connects the touch electrode and the touch chip, and at least part of the touch electrode wiring is arranged in the touch area.

2. The display substrate according to claim 1, wherein: The touch area is provided with a metal grid structure, part of the metal grid constitutes a part of the touch electrode, and part of the metal grid located at the edge of the touch area constitutes a part of the touch electrode routing.

3. The display substrate according to claim 2, wherein: The portion of the metal grid that is less than or equal to 2000 micrometers away from the edge of the touch area constitutes a portion of the touch electrode routing.

4. The display substrate according to claim 2, wherein: The touch electrodes are divided into a plurality of first touch electrodes extending along a first direction and a plurality of second touch electrodes extending along a second direction, the plurality of first touch electrodes are arranged along the second direction, and the plurality of second touch electrodes are arranged along the first direction; the first direction intersects the second direction; The touch electrode wiring includes a first touch electrode wiring connected to the first touch electrode and a second touch electrode wiring connected to the second touch electrode; a first shielding wire is provided between the first touch electrode wiring and the second touch electrode wiring.

5. The display substrate according to claim 4, wherein: The touch electrode wiring includes a touch segment formed of a metal mesh and a frame segment connecting the touch segment and the touch chip; a second shielding wire formed of the metal mesh is provided between the touch segment and the touch electrode.

6. The display substrate according to claim 5, wherein: The display substrate comprises: basal layer; a first metal layer, located on one side of the base layer; a first insulating layer, located on a side of the first metal layer away from the base layer; The second metal layer is located on a side of the first insulating layer away from the first metal layer, and the metal grid is located on the second metal layer.

7. The display substrate according to claim 6, wherein: The touch segment is bridged to the touch electrode through the first metal layer winding.

8. The display substrate according to claim 6, wherein: The first shielding wire is connected to the second shielding wire through the first metal layer winding.

9. The display substrate according to claim 5, wherein: The metal grid includes a plurality of meshes, and the width of the second shielding line is greater than or equal to the width of the meshes.

10. The display substrate according to claim 2, wherein: The metal grid is provided with a plurality of fractures to insulate the touch electrode wiring from the touch electrode; the metal grid includes a plurality of meshes, and a plurality of fractures are provided on one side of the meshes.

11. The display substrate according to claim 10, wherein: The width of the fracture is greater than or equal to 4 microns and less than or equal to 6 microns.

12. A display device, characterized in that: The display device comprises the display substrate according to any one of claims 1 to 11.

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