CN217035639U - Display substrate - Google Patents

Abstract

The application provides a display substrate relates to and shows technical field, includes: the display device comprises a display area and a non-display area, wherein the non-display area comprises a binding area and a cutting area, the cutting area comprises a plurality of signal transmission lines, each signal transmission line comprises a first conductive block, a second conductive block and connecting metal, and the resistance of the first conductive block is smaller than that of the second conductive block; the first conductive block includes a first conductive metal and a second conductive metal; the second conductive block comprises a third conductive metal and a fourth conductive metal which are electrically connected through a connecting metal; the third conductive metal is electrically connected with the first conductive metal through the via hole, and the fourth conductive metal is electrically connected with the second conductive metal through the via hole. This application carries out via hole bridging design to the signal transmission line in cutting area, makes the static that cutting break bar and glass contact produced concentrated in via hole department mostly to can effectively reduce the static that transmits to effective circuit area, reduce the risk that effective circuit area was punctured by the static.

Description

Display substrate

Technical Field

The present application relates to the field of display technologies, and in particular, to a display substrate.

Background

With the continuous improvement of living standard of people, the application of display products is more and more extensive, and the requirements of people on the screen size and the product quality of the display products are more and more high.

In order to improve the quality of the product, a test circuit is usually disposed in the step area during the production process of the display panel to test the display performance of the display panel. However, when the test circuit is located in the step area, the area of the step area is increased, so that the area of the display area is reduced, and the requirement for large-size display cannot be met. In order to reduce the step width, the existing display product is provided with a binding area in the step area and bound with a flexible circuit, and simultaneously, a test circuit is also bound in the binding area and cut off after the performance test of the display product is completed. In the cutting process, static electricity generated by contact of the cutting knife wheel and the glass can directly enter the display panel through the driving circuit, so that devices are damaged or damaged, and the product yield is influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides a display substrate, which performs via bridging design on a signal transmission line in a cutting area, so that most of static electricity generated by contact between a cutting knife wheel and glass is concentrated at a via hole, thereby effectively reducing the static electricity transmitted to an effective circuit area, and reducing the risk of electrostatic breakdown in the effective circuit area.

The application provides a display substrate, includes: the display device comprises a display area and a non-display area surrounding the display area, wherein the non-display area comprises a binding area and a cutting area, the binding area comprises a plurality of binding pins, and the cutting area is positioned on one side, far away from the display area, of the binding area;

the cutting area comprises a plurality of signal transmission lines which extend along a first direction and are arranged along a second direction, and the signal transmission lines are electrically connected with the binding pins; the signal transmission line comprises a first conductive block, a second conductive block and connecting metal, wherein the resistance of the first conductive block is smaller than that of the second conductive block;

the first conductive block comprises a first conductive metal and a second conductive metal; the second conductive block comprises a third conductive metal and a fourth conductive metal, and the third conductive metal and the fourth conductive metal are electrically connected through the connecting metal;

in a direction perpendicular to the plane of the display substrate, at least one insulating layer is arranged between the first conductive block and the second conductive block, and the insulating layer is provided with a plurality of through holes penetrating through the insulating layer along the plane perpendicular to the display substrate; the third conductive metal is electrically connected with the first conductive metal through the via hole, and the fourth conductive metal is electrically connected with the second conductive metal through the via hole.

Compared with the related art, the display substrate provided by the application at least realizes the following beneficial effects:

the application provides a display substrate, through set up first conductive block of via hole bridge and second conductive block on the insulating layer, make and realize the electricity through the via hole between third conductive metal and the first conductive metal and connect, realize the electricity through the via hole between fourth conductive metal and the second conductive metal and connect, so, test circuit can be through first conductive block, second conductive block and connect metal with test signal transmission to binding the district, a plurality of bonding pads transmission to display area in binding the district, the realization is to display substrate's capability test. When the test is accomplished and is cut test circuit, the cutting break bar cuts along the joint metal, because the resistance of second conducting block is great, and is connected through the via hole electricity between second conducting block and the first conducting block, then contact resistance between the two is great, makes the static that cutting break bar and glass contact produced concentrated in via hole department mostly to can effectively reduce the static that transmits to effective circuit region, reduce the risk that effective circuit region was punctured by the static.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a display substrate according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a signal transmission line according to an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view along AA' of FIG. 2;

fig. 4 is a schematic structural diagram of another signal transmission line according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a structure of a bonding metal provided in accordance with an embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along line BB' of FIG. 5;

fig. 7 is a schematic structural diagram of another connecting metal provided in the embodiment of the present application;

FIG. 8 is a cross-sectional view taken along line CC' of FIG. 7;

FIG. 9 is a schematic view of another structure of a bonding metal provided in accordance with an embodiment of the present disclosure;

FIG. 10 is a cross-sectional view taken along line DD' of FIG. 9;

fig. 11 is a schematic structural diagram of a signal transmission line according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of another connecting metal provided in the embodiment of the present application.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The scope of the present application is to be considered as defined by the appended claims. The same parts between the embodiments are not described in detail.

In order to reduce the step width, the conventional display product is provided with a binding area in a step area and bound with a flexible circuit, and simultaneously, a test circuit is also bound in the binding area and cut off after the performance test of the display product is finished. In the cutting process, static electricity generated by contact of the cutting knife wheel and the glass can directly enter the display panel through the driving circuit, so that devices are damaged or damaged, and the yield of products is influenced.

In view of this, the present application provides a display substrate, which performs via bridging design on a signal transmission line in a cutting area, so that most of static electricity generated by contact between a cutting cutter wheel and glass is concentrated at a via hole, thereby effectively reducing static electricity transmitted to an effective circuit area, and reducing the risk of electrostatic breakdown in the effective circuit area.

The following detailed description is to be read with reference to the drawings and the detailed description.

Fig. 1 is a schematic structural diagram of a display substrate 100 according to an embodiment of the present disclosure, fig. 2 is a schematic structural diagram of a signal transmission line 41 according to an embodiment of the present disclosure, fig. 3 is a cross-sectional view along AA' of fig. 2, and referring to fig. 1 to fig. 3, the display substrate 100 according to an embodiment of the present disclosure includes: the display device comprises a display area 10 and a non-display area 20 surrounding the display area 10, wherein the non-display area 20 comprises a binding area 30 and a cutting area 40, the binding area 30 comprises a plurality of binding pins 31, and the cutting area 40 is positioned on one side of the binding area 30, which is far away from the display area 10;

the cutting area 40 includes a plurality of signal transmission lines 41 extending along the first direction and arranged along the second direction, and the signal transmission lines 41 are electrically connected with the bonding pins 31; the signal transmission line 41 includes a first conductive block 42, a second conductive block 43, and a connection metal 44, the resistance of the first conductive block 42 being smaller than the resistance of the second conductive block 43;

the first conductive block 42 includes a first conductive metal 421 and a second conductive metal 422; the second conductive block 43 includes a third conductive metal 431 and a fourth conductive metal 432, and the third conductive metal 431 and the fourth conductive metal 432 are electrically connected through a connection metal 44;

at least one insulating layer 45 is arranged between the first conductive block 42 and the second conductive block 43 along the direction vertical to the plane of the display substrate 100, and the insulating layer 45 is provided with a plurality of through holes 451 which penetrate through the insulating layer 45 along the direction vertical to the plane of the display substrate 100; the third conductive metal 431 is electrically connected to the first conductive metal 421 through the via 451, and the fourth conductive metal 432 is electrically connected to the second conductive metal 422 through the via 451.

Specifically, referring to fig. 1, a display substrate 100 provided in the embodiment of the present application includes a display area 10 and a non-display area 20, the non-display area 20 surrounds the display area 10, the non-display area 20 includes a bonding area 30 and a cutting area 40, the cutting area 40 includes a plurality of signal transmission lines 41, one end of each signal transmission line 41 is connected to a bonding pin 31 located in the bonding area 30, and the other end of each signal transmission line is connected to a test circuit 50, before cutting, the test circuit 50 transmits a signal to the bonding pin 31 through the signal transmission line 41, so as to implement a performance test on the display substrate 100.

In order to reduce the step width, the test circuit 50 is cut off along the cutting area 40 after the test is completed, and in order to reduce the static electricity generated during the cutting process, the signal transmission line 41 is designed to be in a via 451 bridge connection mode. Referring to fig. 2, the signal transmission line 41 includes a first conductive block 42 and a second conductive block 43, wherein the resistance of the first conductive block 42 is smaller than that of the second conductive block 43, the first conductive block 42 includes a first conductive metal 421 and a second conductive metal 422, the second conductive block 43 includes a third conductive metal 431 and a fourth conductive metal 432, and the third conductive metal 431 and the fourth conductive metal 432 are electrically connected through a connection metal 44, so as to realize signal transmission between the third conductive metal 431 and the fourth conductive metal 432.

Referring to fig. 3, an insulating layer 45 is disposed between the first conductive block 42 and the second conductive block 43 along a direction perpendicular to the plane of the display substrate 100, and the insulating layer 45 separates the first conductive block 42 from the second conductive block 43, so as to prevent the first conductive block 42 from directly contacting the second conductive block 43. In order to realize the electrical connection between the first conductive block 42 and the second conductive block 43, a plurality of via holes 451 are formed in the insulating layer 45, and the via holes 451 penetrate through the insulating layer 45 in a direction perpendicular to the plane of the display substrate 100, so that the third conductive metal 431 and the first conductive metal 421 are electrically connected through the via holes 451, and the fourth conductive metal 432 and the second conductive metal 422 are electrically connected through the via holes 451, so that the test circuit 50 can transmit the test signal to the bonding region 30 through the first conductive block 42, the second conductive block 43, and the connection metal 44, and transmit the test signal to the display region 10 through the plurality of bonding pins 31 in the bonding region 30, thereby realizing the performance test on the display substrate 100.

The signal transmission line 41 is electrically connected with the binding pin 31, static electricity generated by cutting of the cutting knife wheel can be transmitted to the binding pin 31 along the signal transmission line 41, and the binding pin 31 is electrically connected with the flexible circuit board and the signal line of the display area 10 respectively, so that when the static electricity is transmitted to the binding pin 31, the static electricity can be transmitted to the flexible circuit board, the display area 10 and other effective circuit areas through the binding pin 31, and the risk that the effective circuit areas are subjected to static electricity breakdown is caused. Therefore, this application sets up signal transmission line 41 in cutting district 40 and passes through the via hole bridging, so, when test completion cuts test circuit 50 off, the cutting break bar cuts along joint metal 44, because the resistance of second conducting block 43 is great, and be connected through via hole 451 electricity between second conducting block 43 and the first conducting block 42, then contact resistance between the two is great, the static that makes cutting break bar and glass contact produce is mostly concentrated in via hole 451 department, thereby can effectively reduce the static that transmits to effective circuit district, reduce the risk that effective circuit district was punctured by the static.

It should be noted that fig. 1-3 are only for illustrative purposes to illustrate bridging by vias in the dicing area, and do not represent the actual number of bonding pins 31, signal transmission lines 41, or the actual size and position of the connecting metal 44, the vias 451, the first conductive bumps 42, and the second conductive bumps 43.

Optionally, referring to fig. 4, in a direction perpendicular to a plane of the display substrate 100, the number of the vias 451 between the third conductive metal 431 and the first conductive metal 421 is greater than or equal to 2, and the number of the vias 451 between the fourth conductive metal 432 and the second conductive metal 422 is greater than or equal to 2.

Specifically, referring to fig. 4, since the resistance of the second conductive block 43 is relatively large, and the second conductive block 43 is electrically connected to the first conductive block 42 through the via hole 451, the contact resistance between the two is relatively large, so that most of the static electricity generated by the contact between the cutter wheel and the glass is concentrated at the via hole 451. Therefore, in this embodiment, the number of the via holes 451 arranged between the third conductive metal 431 and the first conductive metal 421 is greater than or equal to 2, and the number of the via holes 451 arranged between the fourth conductive metal 432 and the second conductive metal 422 is greater than or equal to 2, so that more via holes 451 can be subjected to electrostatic voltage division, which is beneficial to increase the static electricity concentrated at the via holes 451, thereby further reducing the static electricity transmitted to the effective circuit area, and reducing the risk of electrostatic breakdown of the effective circuit area.

It should be noted that fig. 4 is only for schematically illustrating that two or more vias 451 are disposed between the first conductive metal 421 and the third conductive metal 431, and two or more vias 451 are disposed between the second conductive metal 422 and the fourth conductive metal 432, and do not represent the actual number and size of the vias 451, and in practical applications, the number of the vias 451 may also be specifically set according to needs, and the present application is not limited thereto.

Optionally, referring to fig. 2, the via hole 451 is circular, and a diameter d of the via hole 451 ranges from 3um to 10 um. Specifically, referring to fig. 2, in the embodiment, the through hole 451 is circular, and the diameter d of the through hole 451 is greater than or equal to 3um and less than or equal to 10um, because the resistance of the second conductive block 43 is larger, and the second conductive block 43 is electrically connected to the first conductive block 42 through the through hole 451, the smaller the through hole 451 is, the larger the contact resistance between the first conductive block 42 and the second conductive block 43 is. When the diameter d of the via hole 451 is greater than or equal to 3um and less than or equal to 10um, on one hand, the second conductive block 43 and the first conductive block 42 can be ensured to be electrically connected through the via hole 451, and the problem that the via hole 451 is too small and the two conductive blocks cannot be electrically connected is avoided; on the other hand, can make the cutting break bar with the static that glass contact produced concentrated in via hole 451 the department mostly, can effectively reduce the static that transmits to effective circuit region, reduce the risk that effective circuit region was punctured by the static.

It should be noted that the diameter of the via hole 451 is equal to or greater than 3um and equal to or less than 10um, which is only one embodiment in the present embodiment, and is not limited to the present application.

Optionally, referring to fig. 2, the length L1 of the second conductive block 43 along the first direction has a value range of 20um ≦ L1 ≦ 50 um; the width L2 of the second conductive piece 43 along the second direction has a value range of 2um L2 um 50 um. Specifically, referring to fig. 2, since the resistance of the second conductive block 43 is large, the signal transmission capability thereof is weak, and in order to avoid the disadvantage of the large arrangement of the second conductive block 43 to the signal transmission, referring to fig. 2, the length L1 of the second conductive block 43 along the first direction is set to have a value range of 20um ≦ L1 ≦ 50um, and the width L2 of the second conductive block 43 along the second direction is set to have a value range of 2um ≦ L2 ≦ 50um in the present embodiment. The length and the width of the second conductive block 43 are set within a proper range, so that the problem that static electricity is transmitted to an effective area due to the fact that the second conductive block 43 is too small and a through hole 451 cannot be formed can be solved; on the other hand, the problem that the signal cannot be effectively transmitted due to the fact that the second conductive block 43 is too large can be avoided.

It should be noted that the length L1 of the second conductive block 43 along the first direction is set to have a value range of 20um ≦ L1 ≦ 50um, and the width L2 of the second conductive block 43 along the second direction is set to have a value range of 2um ≦ L2 ≦ 50um, which is only one embodiment in this embodiment and is not limited in this application.

Alternatively, fig. 5 is a schematic structural diagram of a connection metal 44 provided in an embodiment of the present application, fig. 6 is a cross-sectional view taken along BB' in fig. 5, please refer to fig. 5 and fig. 6, where the connection metal 44 includes n first transmission line groups 46 and n +1 second transmission line groups 47 arranged along a first direction, where n is an integer greater than or equal to 1; the second transmission line group 47 includes at least one second transmission line 471, and the first transmission line group 46 includes at least one first transmission line 461; the resistance of the first transmission line 461 is smaller than the resistance of the second transmission line 471; in a direction perpendicular to the plane of the display substrate 100, the second transmission line 471 at least partially overlaps the first transmission line 461, and the overlapping portion of the second transmission line 471 and the first transmission line 461 is electrically connected through the via hole 451; the second transmission line group 47 adjacent to the third conductive metal 431 is electrically connected to the third conductive metal 431, and the second transmission line group 47 adjacent to the fourth conductive metal 432 is electrically connected to the fourth conductive metal 432.

Specifically, referring to fig. 5 and 6, the connection metal 44 includes n first transmission line groups 46 and n +1 second transmission line groups 47, the first transmission line groups 46 and the second transmission line groups 47 are alternately arranged along the first direction, and n is an integer greater than or equal to 1. The second transmission line group 47 includes at least one second transmission line 471, the first transmission line group 46 includes at least one first transmission line 461, and the resistance of the first transmission line 461 is smaller than that of the second transmission line 471. The second transmission line 471 may be made of the same material as the second conductive block 43, such as indium tin oxide; the first transmission line 461 may be made of the same material as the first conductive block 42, such as copper, aluminum or molybdenum.

Referring to fig. 6, an insulating layer 45 is disposed between the second transmission line 471 and the first transmission line 461 in a direction perpendicular to the plane of the display substrate 100, and the insulating layer 45 separates the second transmission line 471 and the first transmission line 461 to prevent the second transmission line 471 from directly contacting the first transmission line 461. In a direction perpendicular to the plane of the display substrate 100, the second transmission line 471 and the first transmission line 461 have an overlapping portion, a via hole 451 is disposed on the insulating layer 45 at a region where the second transmission line 471 and the first transmission line 461 overlap, and the second transmission line 471 and the first transmission line 461 are electrically connected through the via hole 451, so that signals can be transmitted therebetween. In addition, the second transmission line group 47 close to the third conductive metal 431 is electrically connected to the third conductive metal 431, and the second transmission line group 47 close to the fourth conductive metal 432 is electrically connected to the fourth conductive metal 432, so that the electrical connection relationship among the third conductive metal 431, the connection metal 44, and the fourth conductive metal 432 is realized, thereby enabling performance testing of the display substrate 100.

When the test circuit 50 is cut off after the test is completed, the cutter wheel cuts along the connection metal 44. When the cutter wheel is cut along the first transmission line 461, because the resistance of the second transmission line 471 is large, and the second transmission line 471 is electrically connected with the first transmission line 461 through the via hole 451, the contact resistance between the two is large, so that the static electricity generated by the contact of the cutter wheel and the glass is mostly concentrated at the via hole 451, thereby effectively reducing the static electricity transmitted to the effective circuit area and reducing the risk of the electrostatic breakdown of the effective circuit area. In addition, when the cutter wheel is cut along the second transmission line 471, because the resistance of the second conductive block 43 is large, and the second conductive block 43 is electrically connected with the first conductive block 42 through the via hole 451, the contact resistance between the two is large, so that the static electricity generated by the contact of the cutter wheel and the glass is mostly concentrated at the via hole 451, thereby effectively reducing the static electricity transmitted to the effective circuit area and reducing the risk of the static electricity breakdown of the effective circuit area.

It should be noted that fig. 5 and fig. 6 are only for schematically illustrating that the second transmission line 471 is connected with the first transmission line 461 through the via 451, and do not represent the actual number of the vias 451, in an actual application, the number of the vias 451 may be set according to needs, for example, when the static electricity is high, the problem of electrostatic breakdown may be avoided by setting a plurality of vias 451 to further perform electrostatic voltage division.

Alternatively, referring to fig. 5, the width of the second transmission line 471 is smaller than the width of the second conductive block 43 along the second direction. Specifically, referring to fig. 5, when the cutting wheel is cut along the second transmission line 471, the width of the second transmission line 471 is set to be smaller, so that the contact time between the cutting wheel and the second transmission line 471 is shorter, and when the contact time between the cutting wheel and the second transmission line is reduced, the static electricity generated by the contact is also reduced accordingly, thereby further reducing the static electricity and reducing the risk of electrostatic breakdown of the active area.

It should be noted that fig. 5 is only for schematically illustrating that the width of the second transmission line 471 is smaller than the width of the second conductive block 43, and does not represent the actual widths of the second transmission line 471 and the second conductive block 43.

Alternatively, fig. 7 is another schematic structural diagram of the connecting metal 44 provided in this embodiment of the present application, and fig. 8 is a cross-sectional view taken along CC' in fig. 7, please refer to fig. 7 and 8, where n is 1, the first transmission line group 46 includes a first transmission line 461, the second transmission line group 47 includes a second transmission line 471, and an orthogonal projection of the second transmission line 471 on the plane of the display substrate 100 is located in an orthogonal projection range of the first transmission line 461 on the plane of the display substrate 100; one end of the first transmission line 461 is connected to the first conductive metal 421, and the other end is connected to the second conductive metal 422.

Specifically, referring to fig. 7 and fig. 8, in the present embodiment, the connection metal 44 includes a first transmission line group 46 and two second transmission line groups 47, the first transmission line group 46 includes a first transmission line 461, and the second transmission line group 47 includes a second transmission line 471. Both ends of the first transmission line 461 are respectively connected to the first conductive metal 421 and the second conductive metal 422 to realize signal transmission, thereby performing a performance test of the display substrate 100. The orthographic projection of the second transmission line 471 on the plane of the display substrate 100 is located in the orthographic projection range of the first transmission line 461 on the plane of the display substrate 100, an insulating layer 45 is arranged between the first transmission line 461 and the second transmission line 471, and the first transmission line 461 and the second transmission line 471 are electrically connected through a via hole 451 arranged on the insulating layer 45.

When the test circuit 50 is cut off after the test is completed, the cutter wheel cuts along the connecting metal 44. When the cutter wheel is cut along the first transmission line 461, because the resistance of the second transmission line 471 is large, and the second transmission line 471 is electrically connected with the first transmission line 461 through the via hole 451, the contact resistance between the two lines is large, so that the static electricity generated by the contact of the cutter wheel and the glass is mostly concentrated at the via hole 451, thereby effectively reducing the static electricity transmitted to the effective circuit area and reducing the risk of electrostatic breakdown of the effective circuit area. In addition, when the cutting blade wheel cuts along the overlapped area of the first transmission line 461 and the second transmission line 471, because the resistance of the second conductive block 43 is large, and the second conductive block 43 is electrically connected with the first conductive block 42 through the via hole 451, the contact resistance between the two is large, so that the static electricity generated by the contact between the cutting blade wheel and the glass is mostly concentrated at the via hole 451, thereby effectively reducing the static electricity transmitted to the effective circuit area and reducing the risk of the static electricity breakdown of the effective circuit area.

Optionally, referring to fig. 7, along the second direction, the width of the first transmission line 461 is smaller than the width of the first conductive block 42. Referring to fig. 7, when the cutter wheel cuts along the first transmission line 461, the width of the first transmission line 461 is set to be smaller, so that the contact time between the cutter wheel and the first transmission line 461 is shorter, and when the contact time between the cutter wheel and the first transmission line 461 is reduced, the static electricity generated by the contact is correspondingly reduced, thereby further reducing the static electricity and reducing the risk of electrostatic breakdown of the active area.

It should be noted that fig. 7 is only for schematically illustrating that the width of the first transmission line 461 is smaller than the width of the first conductive block 42, and does not represent the actual widths of the first transmission line 461 and the first conductive block 42.

Alternatively, fig. 9 is a schematic diagram illustrating another structure of the connecting metal 44 provided in the embodiment of the present application, and fig. 10 is a cross-sectional view taken along DD' in fig. 9, please refer to fig. 9 and fig. 10, where n is 2, a first transmission line group 46 includes a first transmission line 461, and a second transmission line group 47 includes a second transmission line 471. Specifically, referring to fig. 9 and 10, in the present embodiment, the connection metal 44 includes two first transmission line groups 46 and three second transmission line groups 47, the first transmission line group 46 includes one first transmission line 461, the second transmission line group 47 includes one second transmission line 471, an insulating layer 45 is disposed between the first transmission line 461 and the second transmission line 471, and the first transmission line 461 and the second transmission line 471 are electrically connected through a via hole 451 disposed on the insulating layer 45.

When the test circuit 50 is cut off after the test, the cutting knife wheel can be cut along the second transmission line 471 positioned at the middle, because the width of the second transmission line 471 is smaller, the contact time between the cutting knife wheel and the second transmission line 471 is shorter, and when the contact time between the cutting knife wheel and the second transmission line 471 is reduced, the static electricity generated by contact is correspondingly reduced, so that the static electricity is favorably reduced, and the risk that the effective area is subjected to electrostatic breakdown is favorably reduced. In addition, because the resistances of the second transmission line 471 and the second conductive block 43 are relatively large, the contact resistance at the via hole 451 where the second transmission line 471 is connected with the first transmission line 461 is relatively large, and the contact resistance at the via hole 451 where the second conductive block 43 is electrically connected with the first conductive block 42 is relatively large, so that most of static electricity generated by the contact between the cutter wheel and the glass is concentrated at the via hole 451, thereby effectively reducing the static electricity transmitted to the effective circuit area, and reducing the risk of electrostatic breakdown of the effective circuit area.

Optionally, fig. 11 is a schematic structural diagram of a signal transmission line 41 provided in an embodiment of the present application, please refer to fig. 11, where the second conductive block 43 further includes a fifth conductive metal 433, and an orthogonal projection of the fifth conductive metal 433 on a plane where the display substrate 100 is located is at least partially overlapped with an orthogonal projection of the first transmission line group 46 on the plane where the display substrate 100 is located.

Specifically, referring to fig. 11, in the present embodiment, the second conductive block 43 further includes a fifth conductive metal 433, in a direction perpendicular to the plane of the display substrate 100, the fifth conductive metal 433 is at least partially overlapped with the first transmission line group 46, and a capacitor is formed between the fifth conductive metal 433 and the first transmission line 461. Thus, when the cutter wheel is used for cutting, static electricity is concentrated through the through holes 451 to divide the voltage of the static electricity, the capacitance formed by the fifth conductive metal 433 and the first transmission line 461 can also divide the voltage, and the capacitance can delay the time of the charges entering the effective circuit area, so that time can be provided for static electricity dissipation, and the risk of electrostatic breakdown of the effective circuit area can be further reduced.

It should be noted that fig. 11 is only for schematically illustrating that a capacitor may be formed between the fifth conductive metal 433 and the first transmission line 461, and does not represent the actual size and position of the fifth conductive metal 433.

Optionally, fig. 12 is a schematic structural diagram of another connecting metal provided in the embodiment of the present application, please refer to fig. 12, where n is 2, and one first transmission line group 46 includes one first transmission line 461; in the first direction, the second transmission line group 47 between two first transmission line groups 46 includes one second transmission line 471, the second transmission line group 47 between the first transmission line group 46 and the second conductive block 43 includes a plurality of second transmission lines 471, and the plurality of second transmission lines 471 in the same second transmission line group 47 are arranged in the second direction.

Specifically, referring to fig. 12, in the present embodiment, the connection metal 44 includes two first transmission line groups 46 and three second transmission line groups 47, the first transmission line group 46 includes one first transmission line 461, the second transmission line group 47 located between the two first transmission line groups 46 includes one second transmission line 471 along the first direction, the remaining second transmission line groups 47 include a plurality of first transmission lines 461, and the plurality of second transmission lines 471 located in the same second transmission line group 47 are arranged along the second direction. The width of the second transmission line 471 is relatively narrow, and the second transmission line group 47 disposed at the middle includes only one second transmission line 471, so that the contact time between the cutter wheel and the second transmission line 471 is relatively short, and when the contact time between the cutter wheel and the second transmission line is reduced, the static electricity generated by the contact is also reduced correspondingly, thereby being beneficial to reducing the static electricity, and being beneficial to reducing the risk of electrostatic breakdown of the effective area.

In addition, since the second transmission lines 471 have a relatively large resistance and a relatively weak signal transmission capability, in order to reduce static electricity and ensure stable signal transmission, the remaining second transmission line groups 47 of the present embodiment include a plurality of second transmission lines 471, and the plurality of second transmission lines 471 simultaneously transmit signals, which is beneficial to improving the signal transmission stability.

It should be noted that, in fig. 12, except for the middle-most second transmission line group 47, each of the remaining second transmission line groups 47 includes four second transmission lines 471, which is only an illustrative example and is not meant to limit the present application, and in other embodiments, two, three, or more second transmission lines 471 may be provided, which is not specifically limited in the present application.

Optionally, referring to fig. 2, an orthographic projection of the third conductive metal 431 on the plane of the display substrate 100 is within an orthographic projection range of the first conductive metal 421 on the plane of the display substrate 100, and an orthographic projection of the fourth conductive metal 432 on the plane of the display substrate 100 is within an orthographic projection range of the second conductive metal 422 on the plane of the display substrate 100.

Specifically, referring to fig. 2, in the present embodiment, the orthographic projection of the third conductive metal 431 on the plane of the display substrate 100 is located in the orthographic projection range of the first conductive metal 421 on the plane of the display substrate 100, and the orthographic projection of the fourth conductive metal 432 on the plane of the display substrate 100 is located in the orthographic projection range of the second conductive metal 422 on the plane of the display substrate 100, so that more vias 451 can be disposed between the third conductive metal 431 and the first conductive metal 421, and between the fourth conductive metal 432 and the second conductive metal 422, which not only can improve the stability of signal transmission, but also can increase the electrostatic voltage division by more vias 451, so that more static electricity can be concentrated at the vias 451, which is beneficial to further reducing the static electricity transmitted to the effective circuit area, and reduces the risk of effective electrostatic breakdown.

Alternatively, referring to fig. 2, the second conductive block 43 comprises indium tin oxide, and the first conductive block 42 comprises one or more of aluminum, copper, and molybdenum. Specifically, referring to fig. 2, in order to reduce the static electricity transferred to the active area, the high resistance metal and the low resistance metal are bridged by the via 451, so that the static electricity is concentrated at the via 451. The second conductive block 43 is made of a high resistance metal, such as indium tin oxide, and the first conductive block 42 is made of a low resistance metal, such as one or more of aluminum, copper, and molybdenum. The effective transmission of signals can be realized, so that the static electricity transmitted to the effective area is reduced and the risk of electrostatic breakdown of the effective area is reduced on the basis of completing the performance test of the display substrate 100.

According to the embodiments, the beneficial effects of the present application are as follows:

the application provides a display substrate, through set up first conductive block of via hole bridge and second conductive block on the insulating layer, make and realize the electricity through the via hole between third conductive metal and the first conductive metal and connect, realize the electricity through the via hole between fourth conductive metal and the second conductive metal and connect, thus, test circuit can pass through first conductive block, second conductive block and connection metal transmit test signal to binding the district, through binding a plurality of pads transmission to the display area of binding in the district, realize the performance test to display substrate. When the test is accomplished and is cut test circuit, the cutting break bar cuts along the joint metal, because the resistance of second conducting block is great, and is connected through the via hole electricity between second conducting block and the first conducting block, then contact resistance between the two is great, makes the static that cutting break bar and glass contact produced concentrated in via hole department mostly to can effectively reduce the static that transmits to effective circuit region, reduce the risk that effective circuit region was punctured by the static.

The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.

Claims (13)

1. A display substrate, comprising: the display device comprises a display area and a non-display area surrounding the display area, wherein the non-display area comprises a binding area and a cutting area, the binding area comprises a plurality of binding pins, and the cutting area is positioned on one side of the binding area, which is far away from the display area;

the cutting area comprises a plurality of signal transmission lines which extend along a first direction and are arranged along a second direction, and the signal transmission lines are electrically connected with the binding pins; the signal transmission line comprises a first conductive block, a second conductive block and connecting metal, wherein the resistance of the first conductive block is smaller than that of the second conductive block;

the first conductive block includes a first conductive metal and a second conductive metal; the second conductive block comprises a third conductive metal and a fourth conductive metal, and the third conductive metal and the fourth conductive metal are electrically connected through the connecting metal;

in a direction perpendicular to the plane of the display substrate, at least one insulating layer is arranged between the first conductive block and the second conductive block, and the insulating layer is provided with a plurality of through holes penetrating through the insulating layer along the plane perpendicular to the display substrate; the third conductive metal is electrically connected with the first conductive metal through the via hole, and the fourth conductive metal is electrically connected with the second conductive metal through the via hole.

2. The display substrate of claim 1,

in the direction perpendicular to the plane of the display substrate, the number of the via holes between the third conductive metal and the first conductive metal is greater than or equal to 2, and the number of the via holes between the fourth conductive metal and the second conductive metal is greater than or equal to 2.

3. The display substrate of claim 1,

the via hole is circular, the value range of the diameter d of the via hole is that d is not less than 3um and not more than 10 um.

4. The display substrate of claim 1,

the value range of the length L1 of the second conductive block along the first direction is 20um or more and L1 or more and 50um or less;

the value range of the width L2 of the second conductive block along the second direction is 2 um-L2-50 um.

5. The display substrate of claim 4,

the connecting metal comprises n first transmission line groups and n +1 second transmission line groups which are arranged along a first direction, wherein n is an integer which is more than or equal to 1;

the second transmission line group comprises at least one second transmission line, and the first transmission line group comprises at least one first transmission line; the resistance of the first transmission line is less than the resistance of the second transmission line;

the second transmission line is at least partially overlapped with the first transmission line along the direction perpendicular to the plane of the display substrate, and the part, overlapped with the first transmission line, of the second transmission line is electrically connected through the through hole; the second transmission line group close to the third conductive metal is electrically connected with the third conductive metal, and the second transmission line group close to the fourth conductive metal is electrically connected with the fourth conductive metal.

6. The display substrate of claim 5,

the width of the second transmission line is smaller than the width of the second conductive block along the second direction.

7. The display substrate of claim 6, wherein n =1,

the first transmission line group comprises one first transmission line, the second transmission line group comprises one second transmission line, and the orthographic projection of the second transmission line on the plane of the display substrate is positioned in the orthographic projection range of the first transmission line on the plane of the display substrate;

one end of the first transmission line is connected to the first conductive metal, and the other end of the first transmission line is connected to the second conductive metal.

8. The display substrate of claim 7,

the width of the first transmission line is smaller than that of the first conductive block along the second direction.

9. The display substrate of claim 6, wherein n =2,

one of the first transmission line groups includes one of the first transmission lines, and one of the second transmission line groups includes one of the second transmission lines.

10. The display substrate of claim 6,

the second conductive block further comprises a fifth conductive metal, and the orthographic projection of the fifth conductive metal on the plane of the display substrate is at least partially overlapped with the orthographic projection of the first transmission line group on the plane of the display substrate.

11. The display substrate of claim 6, wherein n =2,

one said first transmission line group comprising one said first transmission line;

along the first direction, the second transmission line group located between the two first transmission line groups comprises one second transmission line, the second transmission line group located between the first transmission line group and the second conductive block comprises a plurality of second transmission lines, and the plurality of second transmission lines located in the same second transmission line group are arranged along the second direction.

12. The display substrate of claim 1,

the orthographic projection of the third conductive metal on the plane of the display substrate is located in the orthographic projection range of the first conductive metal on the plane of the display substrate, and the orthographic projection of the fourth conductive metal on the plane of the display substrate is located in the orthographic projection range of the second conductive metal on the plane of the display substrate.

13. The display substrate of claim 1,

the second conductive block is indium tin oxide, and the first conductive block is one of aluminum, copper and molybdenum.

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