A display substrate, a display device, and a method for manufacturing a display substrate

Abstract

Embodiments of the present application relate to the technical field of display, and provide a display substrate, comprising a display area and a peripheral area located at least one side of the display area, the display substrate comprising: a substrate, and a scan signal line and a driving circuit located at one side of the substrate; wherein the scan signal line extends along a first direction, the driving circuit is located at the peripheral area, and comprises a first driving signal line extending along a second direction and arranged close to the display area, the scan signal line is located at one side of the first driving signal line close to the display area; the first driving signal line comprises a first extension part and a second extension part arranged in different layers, the first extension part and the second extension part are connected through a via, the first extension part is arranged in the same layer as the scan signal line, and in the first direction, the second extension part at least partially overlaps with the scan signal line.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a display substrate, a display device, and a method for preparing the display substrate. Background Technology

[0002] With the development of semiconductor technology, in large-size OLED products, due to the long length of signal lines on the display substrate, the accumulation of static electricity during the process is aggravated. At the end of the signal line (gate line), the accumulated static electricity will be released, resulting in ESD (Electronic Static Discharge) burn phenomenon.

[0003] When ESD occurs at the ends of the scan signal lines in the display area of ​​the display substrate, it can cause short circuits in the affected area and lead to poor contact between the scan signal lines in the display area and the drive circuit signal lines in the surrounding area, thus affecting the lifespan of the display. Therefore, improving the anti-static capability of the display substrate is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This application provides a display substrate, a display device, and a method for manufacturing the display substrate, aiming to solve the problem of how to improve the antistatic capability of the display substrate.

[0005] A first aspect of this application provides a display substrate, including a display area and a peripheral area located on at least one side of the display area, the display substrate comprising:

[0006] A substrate, and a scan signal line and driving circuit located on one side of the substrate;

[0007] The scanning signal line extends along a first direction, and the driving circuit is located in the peripheral area, including a first driving signal line that extends along a second direction and is disposed close to the display area. The scanning signal line is located on the side of the first driving signal line that is close to the display area.

[0008] The first drive signal line includes a first extension and a second extension disposed on different layers. The first extension and the second extension are connected by a via. The first extension is disposed on the same layer as the scan signal line, and in the first direction, the second extension and the scan signal line at least partially overlap.

[0009] In one optional embodiment, the first drive signal line further includes: a third extension located on the side of the second extension away from the first extension, the third extension being disposed on the same layer as the first extension, and the third extension being connected to the second extension via a via.

[0010] In one alternative embodiment, the second extension is located on the side of the scan signal line closer to the substrate;

[0011] The driving circuit is connected to the scanning signal line via an adapter cable, which is located on the side of the scanning signal line away from the substrate.

[0012] In one alternative embodiment, the scan signal line includes a first terminal located at the end of the scan signal line near the first drive signal line, and the first terminal is connected to the adapter cable via a via.

[0013] In one alternative embodiment, the scanning signal line further includes a second terminal located between the first terminal and the display area, and the second terminal is connected to the adapter cable via a via.

[0014] In one optional embodiment, the display substrate includes a plurality of scan signal lines, the scan signal lines including a first scan signal line and a second scan signal line;

[0015] Wherein, the first terminal and the second terminal on the first scan signal line are located on the first side of the first scan signal line, and the first terminal and the second terminal on the second scan signal line are located on the second side of the second scan signal line.

[0016] In one optional embodiment, the driving circuit further includes: a second driving signal line extending along the second direction and located on the side of the first driving signal line away from the display area, wherein the second driving signal line is disposed on the same layer as the scan signal line.

[0017] In one alternative implementation, the second extension completely covers the scan signal line in the first direction.

[0018] A second aspect of this application provides a display device, including a display substrate as described in any one of the first aspects.

[0019] A third aspect of this application provides a method for preparing a display substrate, comprising:

[0020] Provide substrate;

[0021] A scan signal line and a driving circuit are formed on one side of the substrate;

[0022] The scanning signal line extends along a first direction, and the driving circuit is located in the peripheral area, including a first driving signal line that extends along a second direction and is disposed close to the display area. The scanning signal line is located on the side of the first driving signal line that is close to the display area.

[0023] The first driving signal line includes a first extension and a second extension disposed on different layers. The first extension and the second extension are connected through a via. The first extension is disposed on the same layer as the scan signal line, and in the first direction, the second extension at least partially overlaps with the scan signal line. A gate layer is provided and disposed on one side of the substrate. The gate layer includes a driving circuit layer and an active layer disposed on the same layer. The gate metal line of the driving circuit layer near the active layer includes a first region and a second region. The distance between the first region and the substrate is smaller than the distance between the second region and the substrate.

[0024] Beneficial effects:

[0025] This application provides a display substrate, a display device, and a method for fabricating a display substrate, including a display area and a peripheral area located on at least one side of the display area. The display substrate includes a substrate, and a scan signal line and a driving circuit located on one side of the substrate. The scan signal line extends along a first direction, and the driving circuit is located in the peripheral area, including a first driving signal line extending along a second direction and disposed close to the display area. The scan signal line is located on the side of the first driving signal line close to the display area. The first driving signal line includes a first extension and a second extension disposed on different layers, the first extension and the second extension being connected through a via. The first extension and the scan signal line are disposed on the same layer, and in the first direction, the second extension and the scan signal line at least partially overlap. By providing a first extension and a second extension on different layers on the first driving signal line, this application effectively increases the distance between the second extension and the scan signal line, reducing the possibility of ESD burn-in and improving the anti-static capability of the display substrate. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a display substrate structure in the prior art;

[0028] Figure 2 This is a cross-sectional schematic diagram of a display substrate in the prior art;

[0029] Figure 3 This is a schematic diagram illustrating the principle of poor overlap of display substrates in existing technology;

[0030] Figure 4 This is a schematic diagram of the structure of a display substrate according to an embodiment of this application;

[0031] Figure 5 This is a cross-sectional schematic diagram of a display substrate according to an embodiment of this application;

[0032] Figure 6 This is a schematic diagram of a first driving signal line structure according to an embodiment of this application;

[0033] Figure 7 This is a circuit diagram of a display substrate proposed in one embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 101, display area; 102, peripheral area; 1, substrate; 2, scan signal line; 21, first terminal; 22, second terminal; 201, first scan signal line; 202, second scan signal line; 3, first drive signal line; 31, first extension; 32, second extension; 33, third extension; 4, adapter line; 5, second drive signal line. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] Figure 1 A schematic diagram of a prior art display substrate structure is shown, such as... Figure 1 As shown, the display substrate includes a display area and a peripheral area. The gate line in the display area near the peripheral area is the end of the scan signal line G0, and the line in the peripheral area near the edge of the display area is the drive signal line vgl.

[0037] Because the display substrate is relatively large in existing technologies, the scan signal line G0 on the display substrate is quite long. During signal transmission, electrostatic charge accumulates, and ESD (electrostatic discharge) occurs at the end of the scan signal line G0 near the edge of the driving signal line vgl. Specifically, Figure 2 A schematic cross-sectional view of a display substrate in the prior art is shown, such as... Figure 2As shown, the distance between the end of the scan signal line G0 and the drive signal line vgl at the edge of the display area is L1. Since the scan signal line G0 and the drive signal line vgl at the edge of the display area are arranged on the same layer, the distance L1 is small. When the accumulated electrostatic charge is released at the end of the scan signal line G0, an ESD phenomenon occurs between the end of the scan signal line G0 and the drive signal line vgl at the edge of the display area, breaking down the insulating protective layer on the surface of the scan signal line G0 and the drive signal line vgl, causing a short circuit.

[0038] In addition, such as Figure 1 As shown, the end of the scan signal line G0 is provided with a pad (dummy pad) with multiple vias. When the accumulated static electricity at the end of the scan signal line G0 is released and ESD occurs, the insulating protective layer on the metal surface in the pad area is damaged, the pad metal is exposed and undergoes oxidation, and foreign objects in the vias of the pad are adsorbed, resulting in poor connection between the scan signal line and the driving circuit in the surrounding area. Figure 3 This diagram illustrates the principle of poor overlap of display substrates in the prior art, such as... Figure 3 As shown, the driving circuit in the surrounding area is connected to the via of the pad at the end of the scan signal line via an adapter cable. Due to the ESD phenomenon, foreign objects are adsorbed into the via of the pad at the end of the scan signal line, causing abnormal connection between the adapter cable and the scan signal line, which reduces the effectiveness of current conduction.

[0039] In view of this, embodiments of this application propose a display substrate, Figure 4 A schematic diagram of a display substrate structure is shown, such as... Figure 4 As shown, the display substrate includes a display area 101 and a peripheral area 102 located on at least one side of the display area. The display substrate includes a substrate 1, a scan signal line 2 and a driving circuit located on one side of the substrate 1. The scan signal line 2 is located within the display area 101 and extends along a first direction. Figure 7 A circuit diagram of a display substrate is shown, such as Figure 7 As shown, at the boundary between the display area and the surrounding area, the scan signal line 2 of the display area 101 and the drive signal line of the drive circuit of the surrounding area near the display area (within the elliptical area marked in the figure) are configured as follows:

[0040] In this embodiment, the driving circuit is located within the peripheral region 102. The driving circuit includes a first driving signal line 3 near the display region 101. The first driving signal line extends along a second direction, which is perpendicular to the first direction. The scan signal line 2 located within the display region 101 is situated on the side of the first driving signal line 3 closest to the display region 101.

[0041] In this embodiment, the line within the display area 101 near the peripheral area 102 is the end of the scan signal line 2, and the line in the peripheral area 102 near the display area 101 is the first drive signal line 3. The first drive signal line 3 includes a first extension 31 and a second extension 32 disposed on different layers, connected by a via. The first extension 31 of the first drive signal line 3 is disposed on the same layer as the scan signal line 2, and in the first direction, the second extension 32 at least partially overlaps with the scan signal line 2.

[0042] Since the first extension 31 and the second extension 32 are disposed in different layers, and the first extension 31 is disposed in the same layer as the scan signal line 2, the plane in which the second extension 32 is located is different from the plane in which the scan signal line 2 and the first extension 31 are located in the normal direction of the substrate 1; since the second extension 32 and the scan signal line 2 at least partially overlap in the first direction, the second extension 32 and the scan signal line 2 correspond one-to-one in the first direction. Figure 5 A schematic cross-sectional view of a display substrate is shown, such as... Figure 5 As shown, the distance between the second extension 32 and the end of the scan signal line 2 is L2. Since the plane where the second extension 32 is located is higher or lower than the plane where the scan signal line 2 and the first extension 31 are located, and corresponds one-to-one with the scan signal line 2 in the first direction, the distance L2 between the second extension 32 and the end of the scan signal line 2 becomes larger. This effectively increases the distance between the metal of the second extension 32 and the metal of the end of the scan signal line 2. When the distance between the metals increases, it becomes more difficult for the electrostatic charge released at the end of the scan signal line 2 to break through the insulating protective layer on the circuit surface, effectively avoiding the occurrence of ESD phenomenon.

[0043] In one optional embodiment, in the first direction, the second extension 32 completely covers the scan signal line 2. At this time, in the first direction, the second extension 32 corresponds completely to the scan signal line 2. If the end of the scan signal line 2 releases the accumulated electrostatic charge, the area where the ESD burn phenomenon occurs is the second extension 32. Since the plane where the second extension is located is different from the plane where the scan signal line 2 is located, the distance L2 between the second extension 32 and the end of the scan signal line 2 becomes larger, effectively avoiding the occurrence of the ESD phenomenon.

[0044] In an optional embodiment, the first drive signal line 3 further includes a third extension 33. Figure 6 A schematic diagram of a first drive signal line structure is shown, as follows: Figure 6As shown, the third extension 33 is disposed on the same layer as the first extension 31 and is connected to the second extension 32 through a via; and on the orthographic projection of the first driving signal line 3 on the substrate 1, the third extension 33 is located on the side of the second extension 32 away from the first extension 31. In the first direction, the second extension 32 of the first driving signal line 3 corresponds to the scan signal line 2. Since the second extension 32 is disposed on a different layer from the scan signal line 2, while the first extension 31 and the third extension 33 are disposed on the same layer as the scan signal line 2, the distance L2 between the second extension 32 and the end of the scan signal line 2 is larger than the distance L1 between the end of the scan signal line and the driving signal line at the edge of the display area in the prior art, thus improving the antistatic capability of the display substrate.

[0045] In one optional embodiment, the second extension 32 is located on the side of the scan signal line 2 closer to the substrate 1, in which case the plane containing the second extension 32 is lower than the plane containing the scan signal line 2; for example Figure 4 As shown, the driving circuit is connected to the scanning signal line 3 via an adapter cable 4, which is located on the side of the scanning signal line 2 away from the substrate 1.

[0046] In one optional embodiment, the material of the second extension 32 is an opaque single-layer or multi-layered metal. The specific material of the second extension 32 can be set according to the actual situation, and this application does not impose any restrictions. For example, the second extension can be a single-layered metal such as aluminum, molybdenum, or copper, or a multi-layered structure composed of multiple such single-layered metals.

[0047] In one alternative implementation, such as Figure 4 As shown, the scan signal line 2 includes a first terminal 21, which is located at the end of the scan signal line 2 near the first drive signal line 3. The first terminal 21 is connected to the adapter cable 4 through a via on the first terminal 21, thereby connecting the drive circuit to the scan signal line 3.

[0048] In one alternative implementation, such as Figure 4 As shown, the scanning signal line 2 also includes a second terminal 22, which is located between the first terminal 21 and the display area 101. The second terminal 22 is connected to the adapter cable 4 through a via, thereby connecting the driving circuit to the scanning signal line 3.

[0049] This application provides a first terminal 21 and a second terminal 22 for connection at the end of the scanning signal line 2 near the first drive signal line 3, ensuring normal connection between the drive circuit and the scanning signal line 3. The first terminal 21 is closer to the first drive signal line 3 than the second terminal 22. Even though the solution of the above embodiment of this application increases the distance between the end of the first drive signal line 3 and the second extension 32, reducing the possibility of ESD phenomenon, it still cannot completely eliminate ESD burn phenomenon. Therefore, by providing the first terminal 21 and the second terminal 22 at the end of the scanning signal line 2 near the first drive signal line 3, when the electrostatic charge accumulated in the scanning signal line 3 is released at the first terminal 21 at the end, the first terminal 21 is burned due to ESD burn phenomenon. At the same time, foreign matter adsorbed in the via of the first terminal 21 causes abnormal connection between the first terminal 21 and the adapter cable 4. At this time, the scanning signal line 2 can effectively conduct current through the via on the second terminal 22 and the adapter cable 4, ensuring normal connection between the connected scanning signal line 2 and the drive circuit.

[0050] In addition, the first terminal 21 and the second terminal 22 of the scan signal line 2 occupy the pixel area of ​​the original scan signal line. The length and design of the scan signal line 2 remain unchanged. The adapter cable 4 is connected to both the first terminal 21 and the second terminal 22 of the scan signal line 2, which will not affect the circuit design of the display area 101.

[0051] In one alternative implementation, such as Figure 4 As shown, the display substrate includes multiple scan signal lines, including a first scan signal line 201 and a second scan signal line 202. A first terminal 21 and a second terminal 22 on the first scan signal line 201 are located on a first side of the first scan signal line 201, and the first terminal 21 and the second terminal 22 on the second scan signal line 202 are located on a second side of the second scan signal line 202. The first side is the side of the first scan signal line 201 that faces away from the second scan signal line 202, and the second side is the side of the second scan signal line 202 that faces away from the first scan signal line 201.

[0052] In one alternative implementation, such as Figure 4 As shown, the driving circuit further includes one or more second driving signal lines 5, extending along the second direction and located on the side of the first driving signal line 3 away from the display area 101. The second driving signal lines 5 are disposed on the same layer as the scan signal lines 3. The second driving signal lines 5 are made of the same material as the first extension 31 of the first driving signal line 3.

[0053] This application provides a display substrate, a display device, and a method for fabricating the display substrate. The display substrate includes a display area and a peripheral area located on at least one side of the display area. The display substrate includes a substrate, and a scan signal line and a driving circuit located on one side of the substrate. The scan signal line extends along a first direction, and the driving circuit is located in the peripheral area, including a first driving signal line extending along a second direction and disposed close to the display area. The scan signal line is located on the side of the first driving signal line close to the display area. The first driving signal line includes a first extension and a second extension disposed on different layers. The first extension and the second extension are connected through a via. The first extension and the scan signal line are disposed on the same layer, and in the first direction, the second extension and the scan signal line at least partially overlap. By providing a first extension and a second extension on different layers on the first driving signal line, this application effectively increases the distance between the second extension and the scan signal line, reducing the possibility of ESD burn-in and improving the anti-static capability of the display substrate.

[0054] Based on the same inventive concept, this application also provides a display device, including the above-described display substrate.

[0055] It should be noted that since the display device of this application embodiment includes the display substrate of this application embodiment, the display device of this application embodiment also has the above-mentioned beneficial effects of the display substrate of this application embodiment, which will not be repeated here.

[0056] Based on the same inventive concept, this application also provides a method for preparing a display substrate, comprising the following steps:

[0057] Provide substrate;

[0058] A scan signal line and a driving circuit are formed on one side of the substrate;

[0059] The scanning signal line extends along a first direction, and the driving circuit is located in the peripheral area, including a first driving signal line that extends along a second direction and is disposed close to the display area. The scanning signal line is located on the side of the first driving signal line that is close to the display area.

[0060] The first driving signal line includes a first extension and a second extension disposed on different layers. The first extension and the second extension are connected through a via. The first extension is disposed on the same layer as the scan signal line, and in the first direction, the second extension at least partially overlaps with the scan signal line. A gate layer is provided and disposed on one side of the substrate. The gate layer includes a driving circuit layer and an active layer disposed on the same layer. The gate metal line of the driving circuit layer near the active layer includes a first region and a second region. The distance between the first region and the substrate is smaller than the distance between the second region and the substrate.

[0061] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0062] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, relational terms such as "first" and "second" are only used 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, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "includes a..." does not preclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0063] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0064] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A display substrate, characterized in that, The display substrate includes a display area and a peripheral area located on at least one side of the display area, comprising: A substrate, and a scan signal line and driving circuit located on one side of the substrate; The scanning signal line extends along a first direction, and the driving circuit is located in the peripheral area, including a first driving signal line that extends along a second direction and is disposed close to the display area. The scanning signal line is located on the side of the first driving signal line that is close to the display area. The first driving signal line includes a first extension and a second extension disposed in different layers. The first extension and the second extension are connected by a via. The first extension is disposed in the same layer as the scan signal line. In the first direction, the projections of the second extension and the scan signal line on a plane parallel to the substrate at least partially overlap. The material of the second extension is an opaque single-layer or multilayer metal.

2. The display substrate according to claim 1, characterized in that, The first drive signal line further includes a third extension, located on the side of the second extension away from the first extension, the third extension being disposed on the same layer as the first extension, and the third extension being connected to the second extension through a via.

3. The display substrate according to claim 1, characterized in that, The second extension is located on the side of the scan signal line closer to the substrate; The driving circuit is connected to the scanning signal line via an adapter cable, which is located on the side of the scanning signal line away from the substrate.

4. The display substrate according to claim 3, characterized in that, The scanning signal line includes a first terminal located at the end of the scanning signal line near the first drive signal line, and the first terminal is connected to the adapter cable through a via.

5. The display substrate according to claim 4, characterized in that, The scanning signal line also includes a second terminal, which is located between the first terminal and the display area, and the second terminal is connected to the adapter cable through a via.

6. The display substrate according to claim 5, characterized in that, The display substrate includes multiple scan signal lines, including a first scan signal line and a second scan signal line. Wherein, the first terminal and the second terminal on the first scan signal line are located on the first side of the first scan signal line, and the first terminal and the second terminal on the second scan signal line are located on the second side of the second scan signal line.

7. The display substrate according to any one of claims 1 to 6, characterized in that, The driving circuit further includes a second driving signal line extending along the second direction and located on the side of the first driving signal line away from the display area. The second driving signal line is disposed on the same layer as the scanning signal line.

8. The display substrate according to any one of claims 1 to 6, characterized in that, In the first direction on a plane parallel to the substrate, the projection of the second extension completely covers the projection of the scan signal line.

9. A display device, characterized in that, Includes the display substrate as described in any one of claims 1 to 8.

10. A method for preparing a display substrate, characterized in that, include: Provide substrate; A scan signal line and a driving circuit are formed on one side of the substrate; The scanning signal line extends along a first direction, and the driving circuit is located in the peripheral area, including a first driving signal line that extends along a second direction and is disposed close to the display area. The scanning signal line is located on the side of the first driving signal line that is close to the display area. The first driving signal line includes a first extension and a second extension disposed on different layers. The first extension and the second extension are connected through a via. The first extension is disposed on the same layer as the scan signal line. In the first direction, the projections of the second extension and the scan signal line on a plane parallel to the substrate at least partially overlap.

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