A display panel, display master and display device

Abstract

The application discloses a display panel, a display master and a display device. The first type of pads and the light emitting elements are located on the same side of the substrate in the display panel. The first type of traces includes a first end portion, the first end portion is located on the same side of the substrate as the first type of pads, the first type of pads and the first end portion are arranged along a first direction, and along the first direction, the first end portion and the first type of pads at least partially overlap; wherein, the size of the first end portion along the first direction is W1, the size of the first type of pads along the first direction is W2, the size of the first end portion along a second direction is L1, the size of the first type of pads along the second direction is L2, and W1 / L1>W2 / L2. In this way, the first end portion and the light emitting elements are located on the same side of the substrate, that is, the test position is located on the front surface of the display panel during automatic testing, and the reliability of the test can be improved. In addition, the width-length ratio of the first end portion is large, which facilitates the automatic detection requirement of the automatic test equipment, thereby improving the detection efficiency of the automatic detection and the reliability of the display panel.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more particularly to a display panel, a display master, and a display device. Background Technology

[0002] In the mass production of modern display panels (such as LCD and OLED), automated testing is a core component for ensuring production yield and controlling costs. Automated testing typically involves automated test equipment (ATE). ATE uses probes to contact test pads on the panel, applying electrical signals and measuring the response to detect performance defects such as open circuits, short circuits, and incorrect resistance and capacitance parameters. This allows for the rapid identification of defective panels and precise problem localization for repair or rejection. However, with the advancement of display technology, the reliability and efficiency of automated testing have faced challenges. Summary of the Invention

[0003] This invention provides a display panel, a display master, and a display device. By setting the first end and the light-emitting element to be located on the same side of the substrate, the test position is located on the front of the display panel, reducing the risk of damaging the circuit during testing. In addition, the first end has a large width-to-length ratio, which facilitates the automatic testing requirements of automatic testing equipment, improves the robustness and speed of automatic testing equipment docking, thereby improving testing efficiency and the reliability of the display panel.

[0004] In a first aspect, embodiments of the present invention provide a display panel, the display panel including a substrate. A light-emitting element is located on one side of the substrate; The first type of pad is located on the same side of the substrate as the light-emitting element; The first type of trace includes a first end, and the first end and the first type of pad are located on the same side of the substrate; The first type of pads and the first end are arranged along a first direction, and along the first direction, the first end and the first type of pads at least partially overlap; wherein, the dimension of the first end along the first direction is W1, the dimension of the first type of pad along the first direction is W2, the dimension of the first end along the second direction is L1, the dimension of the first type of pad along the second direction is L2, wherein the first direction and the second direction intersect, and W1 / L1 > W2 / L2.

[0005] Optionally, the substrate includes a first main surface, a second main surface, and a side surface, wherein the first main surface and the second main surface are disposed opposite to each other, and the side surface connects the first main surface and the second main surface; The first type of pad is located on the side of the first main surface away from the second main surface; The first type of trace includes a second end located on the side of the second main surface away from the first main surface, and the second end includes an arc-shaped connection structure.

[0006] Optionally, the first type of trace extends from the first main surface through the side surface to the second main surface, and the first type of trace extends along the second main surface through the side surface to the first main surface.

[0007] Optionally, the first type of trace further includes a first connection portion and a second connection portion for electrical connection, wherein the first connection portion is located on the side surface and the second connection portion is located on the second main surface; Different first ends are electrically connected to the arc-shaped connection structure through corresponding first connecting parts and second connecting parts.

[0008] Optionally, the second connecting portion includes a first portion and a second portion, wherein the first portion is electrically connected to the arc-shaped connecting structure through the second portion; The first and second portions extend in the same direction.

[0009] Optionally, the second connecting portion includes a first portion and a second portion, wherein the first portion is electrically connected to the arc-shaped connecting structure through the second portion; The extension directions of the first and second portions intersect.

[0010] Optionally, the first end is located on the side of the first type of pad near the edge of the display panel, and the first end satisfies at least one of the following: The first end extends along the first direction; or Along a direction perpendicular to the plane of the display panel, the first end overlaps with the second type of pad.

[0011] Optional, W1 / L1 > 1.

[0012] Optional, W1 ≥ W2.

[0013] Optionally, the display panel further includes a first metal layer, a second metal layer, and a third metal layer located on one side of the substrate, wherein the first metal layer is located on the side of the second metal layer closer to the substrate, and the third metal layer is located on the side of the second metal layer away from the substrate; The first type of pad includes a first pad layer, a second pad layer, and a third pad layer for electrical connection; The first pad layer is located on the first metal layer, the second pad layer is located on the second metal layer, and the third pad layer is located on the third metal layer; The third pad layer includes a third edge near the side surface, whereby the third pad layer covers the second pad layer to form a first step, and the first pad layer covers the first step along a direction perpendicular to the plane of the display panel.

[0014] Optionally, the first pad layer includes a fifth edge near the side surface; The horizontal distance between the third edge and the fifth edge is greater than or equal to 1 μm.

[0015] Optionally, the second pad layer includes a fourth edge near the side surface, and the first pad layer includes a fifth edge near the side surface; The first pad layer has a first length D1 along the second direction; The horizontal distance between the fourth edge and the fifth edge is less than or equal to D1 / 3.

[0016] Optionally, the substrate includes a first main surface, a second main surface, and a side surface; The display panel further includes a second type of trace, which includes a third end located on the side of the first main surface away from the second main surface and overlaps with a first type of pad in a direction perpendicular to the plane of the display panel.

[0017] Optionally, the first type of trace and the second type of trace are set on the same layer.

[0018] Optionally, the edge of the first end away from the side surface is flush with the edge of the third end away from the side surface.

[0019] Optionally, the second type of routing also includes electrical connection routing and fan-out routing; The connection trace includes a portion located on the side surface and a portion located on the second main surface; The fan-out trace is located on the second main surface, and the extension direction of the fan-out trace intersects with the extension direction of the connecting trace.

[0020] Optionally, the fan-out routing includes a connected first fan-out routing and a second fan-out routing; The extension direction of the first fan-out routing line intersects with the extension direction of the connecting routing line, and the extension direction of the second fan-out routing line intersects with the extension direction of the first fan-out routing line. The angle between the first fan-out routing line and the connecting routing line is greater than or equal to 130°, and the angle between the first fan-out routing line and the second fan-out routing line is greater than or equal to 130°.

[0021] Optionally, the display panel further includes a plurality of third-type traces, which are located on the side of the first-type traces away from the second-type traces, and the third-type traces are insulated.

[0022] In a second aspect, embodiments of the present invention also provide a display master, including a substrate, the substrate including a display area and a cutting area, the cutting area being located on at least one side of the display area; A light-emitting element is located on one side of the substrate and in the display area; The first type of pad is located on the same side of the substrate as the light-emitting element and is located in the display area; The third type of pad is located on the same side of the substrate as the light-emitting element and is located in the cutting area; The first type of trace includes a first end, the first end and the first type of pad are located on the same side of the substrate, and the first type of trace is coupled to the third type of pad; The first type of pads and the first end are arranged along a first direction, and along the first direction, the first end at least partially overlaps with the first type of pads; wherein... The dimension of the first end along the first direction is W1, the dimension of the first type of pad along the first direction is W2, the dimension of the first end along the second direction is L1, and the dimension of the first type of pad along the second direction is L2, wherein the first direction and the second direction intersect, and W1 / L1 > W2 / L2.

[0023] Optionally, a plurality of the first type of pads are arranged along the first direction, and a plurality of the third type of pads are arranged along the second direction.

[0024] Optionally, the display master includes a plurality of fourth type pads, the plurality of fourth type pads being located in the cutting area, and the plurality of fourth type pads being arranged along the second direction; The third type of pad is located on the side of the fourth type of pad that is close to the side surface, and the fourth type of pad is disposed on the same layer as the third type of pad.

[0025] Optionally, a plurality of the third type of pads are arranged along a first direction, wherein the length of the third type of pad along the first direction is W3, and the width of the third type of pad along the second direction is L3; The length and width of the third type of pad satisfy: W3 / L3≥5.

[0026] Optionally, a plurality of first type pads are arranged along a first direction, and the first type pads include the first pad closest to the third type pad; The third type of pad includes the second pad that is closest to the first type of pad; The horizontal distance between the first pad and the second pad along the first direction is greater than or equal to 2 mm. In a third aspect, embodiments of the present invention also provide a display device comprising any of the display panels described in the first aspect.

[0027] The first type of trace in the display panel provided by this invention includes a first end, which is located on the same side of the substrate as the light-emitting element and the first type of pad, i.e., the first end is located on the front side of the display panel. The first type of trace can be a test trace. Thus, during automatic testing, the test pin position is located on the front side of the display panel. When testing the loop resistance, it is not necessary to flip the display panel; the pin can be directly inserted from the front to meet the testing requirements. This avoids the risk of damaging the circuitry in the light-emitting element when the display panel is facing down during testing, improving the reliability of automatic testing. Furthermore, the dimension of the first end along the first direction is W1, the dimension of the first type of pad along the first direction is W2, the dimension of the first end along the second direction is L1, and the dimension of the first type of pad along the second direction is L2, where W1 / L1 > W2 / L2, meaning the width-to-length ratio of the first end is large. This facilitates the automatic detection requirements of automatic testing equipment, improves the robustness and speed of the automatic testing equipment, and thus improves testing efficiency and the reliability of the display panel. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, although the drawings described below are some specific embodiments of the present invention, those skilled in the art can extend and extend the basic concepts of the device structure, driving method and manufacturing method disclosed and indicated by various embodiments of the present invention to other structures and drawings. Undoubtedly, these should all be within the scope of the claims of the present invention.

[0029] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 8 This is a cross-sectional schematic diagram of a first type of pad provided in an embodiment of the present invention; Figure 9 This is a top view of a first type of pad provided in an embodiment of the present invention; Figure 10 This is a top view of another type of first-class pad provided in an embodiment of the present invention; Figure 11 This is a top view of another type of first-class pad provided in an embodiment of the present invention; Figure 12 This is a cross-sectional schematic diagram of another type of first-class pad provided in an embodiment of the present invention; Figure 13 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 14 This is a schematic diagram of another display panel provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of a display master provided in an embodiment of the present invention; Figure 16 This is a schematic diagram of another display master structure provided in an embodiment of the present invention; Figure 17 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be fully described below with reference to the accompanying drawings of the embodiments of this invention through specific implementation methods. Obviously, the described embodiments are only some, not all, embodiments of this invention. Various modifications and variations can be made to this invention without departing from the spirit or scope of this invention, which will be obvious to those skilled in the art. Therefore, this invention is intended to cover modifications and variations of this invention that fall within the scope of the corresponding claims (the claimed technical solutions) and their equivalents.

[0031] Furthermore, the terms "first," "second," and similar terms used in the embodiments of this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "an," "one," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "including" or "comprising" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes. In addition, descriptions of "same" or "equal" in the embodiments of this disclosure do not mean that two objects are completely equal in size or shape; they are allowed to be approximately the same or approximately equal within a certain error range.

[0032] It should be noted that the implementation methods provided in the embodiments of the present invention can be combined with each other without contradiction.

[0033] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention. See also: Figure 1 The display panel includes a substrate 10, a light-emitting element 20, a first type of pad 30, and a first type of trace 40. The light-emitting element 20 is located on one side of the substrate 10. The first type of pad 30 is located on the same side of the substrate 10 as the light-emitting element 20. The first type of trace 40 includes a first end 410, which is located on the same side of the substrate 10 as the first type of pad 30. The first type of pad 30 and the first end 410 are arranged along a first direction X. Along the first direction X, the first end 410 and the first type of pad 30 at least partially overlap, wherein the dimension of the first end 410 along the first direction X is W1, the dimension of the first type of pad 30 along the first direction X is W2, the dimension of the first end 410 along the second direction Y is L1, and the dimension of the first type of pad 30 along the second direction Y is L2, wherein the first direction X and the second direction Y intersect, and W1 / L1 > W2 / L2.

[0034] Specifically, such as Figure 1As shown, the substrate 10 in the display panel may include a first main surface S1, which can be the light-emitting side surface of the display panel. That is, the first main surface S1 includes a display area, which includes multiple light-emitting elements 20. The display panel displays images by emitting light through the multiple light-emitting elements 20. In addition, the first main surface S1 of the display panel is also provided with multiple signal lines 01. The multiple signal lines 01 may include at least one of scan signal lines, data signal lines, positive power signal lines, negative power signal lines, and reset signal lines, etc. The signal lines 01 are electrically connected to the light-emitting elements 20, thereby providing various driving signals required for the light-emitting elements 20 to emit light, so as to ensure the normal operation of the light-emitting elements 20. In addition, the display panel also includes a first type of pad 30, which is located on the same side of the substrate 10 as the light-emitting element 20. That is, the first type of pad 30 is located on the first main surface S1 of the substrate 10. It can be understood that the first type of pad 30 can be a pad that provides signals to the inside of the display panel. That is, the first type of pad 30 is electrically connected to the light-emitting element 20 through the signal line 01, thereby providing various driving signals to the signal line 01.

[0035] In addition, the display panel also includes a first type of trace 40. This first type of trace 40 can be a test trace. The test trace is not part of the circuitry that enables the display function of the display panel; instead, it provides electrical access points for automated testing equipment. This allows the test signals generated by the automated testing equipment to be directed to circuit nodes inside the display panel, thereby determining whether the circuit node has open circuits, short circuits, or abnormal resistance. Alternatively, the test trace can simulate a portion of the internal circuitry of the display panel to test the loop resistance of that portion of the circuit. In related technologies, the test points of the test traces are located on the back of the display panel, i.e., on the non-light-emitting side. During testing, the display panel needs to be flipped so that the front (display surface) faces down, which carries the risk of damaging the wiring in the display area. Furthermore, conventional traces are small in size, requiring high precision in optical positioning and physical contact from automated testing equipment, which can easily lead to alignment failures, poor contact, or slow testing speeds, increasing the risk of misjudgment and testing time.

[0036] Therefore, in this embodiment of the invention, the first type of trace 40 includes a first end 410. The first end 410 and the first type of pad 30 are located on the same side of the substrate 10, that is, the first end 410 is located on the first main surface S1 of the substrate 10. The first end 410 is the test signal input terminal of the first type of trace 40. Thus, by setting the first end 410 on the front side of the display panel, during automatic testing, the test pin position of the probe in the automatic testing equipment is located on the front side of the display panel. When testing through the first type of trace 40, it is not necessary to flip the display panel; the pins can be directly inserted from the front side of the display panel to match the test requirements, thereby avoiding the risk of damaging the circuits in the display area when the front side of the display panel is facing down during testing, and improving the reliability of automatic testing. In addition, the first type of pad 30 and the first end 410 are arranged along the first direction X. Along the first direction X, the first end 410 and the first type of pad 30 at least partially overlap. It can be understood that the first end 410 may partially overlap with the first type of pad 30, or along the first direction X, the first type of pad 30 may completely cover the first end 410. The first end 410 is positioned in the region close to the first type of pad 30 along the second direction Y, so that the first end 410 is located in the region far away from the light-emitting element 20 in the second direction Y. This avoids the risk of electrostatic damage to the light-emitting element 20 during testing due to the first end 410 being too close to the light-emitting element 20. It is understood that the first end 410 and the first type of pad 30 are staggered along the direction perpendicular to the plane of the display panel, thereby avoiding contact between the first type of pad 30 and the first end 410, and ensuring the normal operation of the first type of pad 30 and the first end 410 respectively.

[0037] Furthermore, the dimension of the first end 410 along the first direction X is W1, and the dimension of the first type of pad 30 along the first direction X is W2. This can be understood as the width of the first end 410 being W1 and the width of the first type of pad 30 being W2. Similarly, the dimension of the first end 410 along the second direction Y is L1, and the dimension of the first type of pad 30 along the second direction Y is L2. This can be understood as the length of the first end 410 being L1 and the length of the first type of pad 30 being L2. By setting the width-to-length ratio W1 / L1 of the first end 410 to be greater than the width-to-length ratio W2 / L2 of the first type of pad 30, since the first end 410 is the test signal input terminal of the first type of trace 40, setting the width-to-length ratio of the first end 410 to be larger facilitates the automatic detection needs of the automatic testing equipment. For example, it reduces the difficulty of probe alignment in the automatic testing equipment, improves the robustness and speed of the automatic testing equipment docking, thereby improving the detection efficiency and the reliability of the display panel.

[0038] It should be noted that, Figure 1The example described herein is exemplified by the first end 410 being directly connected to an external test pad, but this is not a limitation. In other embodiments, the first end 410 may also be connected to an external test pad via an overlap pad, and those skilled in the art may configure it as needed.

[0039] In summary, the first type of trace in this invention includes a first end, which is located on the same side of the substrate as the light-emitting element, i.e., the first end is located on the front side of the display panel. The first type of trace can be a test trace, and the first end is the test signal input terminal of the test trace. Thus, during automatic testing, the test pin position of the automatic testing equipment is located on the front side of the display panel, directly pinning the trace from the front side of the display panel to meet the testing requirements. This avoids the risk of damaging the circuitry in the light-emitting element when the display panel is facing down during testing, thus improving the reliability of automatic testing. Furthermore, the width-to-length ratio of the first end is W1 / L1, and the width-to-length ratio of the first type of pad is W2 / L2. By setting the width-to-length ratio of the first end to be greater than that of the first type of pad, it is easier to meet the automatic testing requirements of the automatic testing equipment, improving the robustness and speed of the automatic testing equipment's connection, thereby improving testing efficiency and the reliability of the display panel.

[0040] Optionally, based on the above, Figure 2 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention. See also... Figure 2 The substrate 10 includes a first main surface S1, a second main surface S2, and a side surface S3. The first main surface S1 and the second main surface S2 are disposed opposite to each other, and the side surface S3 connects the first main surface S1 and the second main surface S2. A first type of pad 30 is located on the side of the first main surface S1 away from the second main surface S2. A first type of trace 40 includes a second end 420, which is located on the side of the second main surface S2 away from the first main surface S1. The second end 420 includes an arc-shaped connection structure 4201.

[0041] For example, such as Figure 2 In the embodiment shown, to better illustrate the trace morphology of the first type of trace 40, Figure 2The first main surface S1, the second main surface S2, and the side surface S3 are shown on the same plane. It can be understood that in actual products, the first main surface S1, the second main surface S2, and the side surface S3 are all located on different planes, with the first main surface S1 and the second main surface S2 facing each other, and the side surface S3 connecting the first main surface S1 and the second main surface S2. The following embodiments will not elaborate on these details. The first main surface S1 is the front side (display surface) of the display panel, and the second main surface S2 is the back side (bonding surface) of the display panel. The first type of pad 30 is located on the side of the first main surface S1 away from the second main surface S2, that is, the first type of pad 30 is located in the light-emitting direction of the first main surface S1. In addition, the display panel also includes a second type of trace 50, which is a side trace used to transmit signals on the second main surface S2 to the first main surface S1. The first type of pad 30 is located near the side surface S3 of the light-emitting element 20, so that the light-emitting element 20 on the first main surface S1 can be electrically connected to the second type of trace 50 through the first type of pad 30 to realize signal transmission between the light-emitting element 20 and the second type of trace 50.

[0042] See also Figure 2 The first type of trace 40 includes a second end 420, which is located on the side of the second main surface S2 away from the first main surface S1, that is, the second end 420 is located on the second main surface S2 and in the non-light-emitting direction of the second main surface S2. It is understandable that the first type of trace 40 is currently typically fabricated using a patterned process of film lamination, hot pressing, metal plating, and peeling. Furthermore, the first type of trace 40 has a corner shape at its second end 420. If the corner shape of the second end 420 is a sharp right angle or acute angle, local stress will concentrate at the sharp right angle or acute angle during the peeling process, potentially damaging the first type of trace 40. Therefore, by including an arc-shaped connection structure 4201 at the second end 420, for example, a "U"-shaped structure, the arc provides a smooth and connected transition, eliminating stress concentration points. During the peeling process, stress is evenly distributed on the second end 420, reducing the risk of damage to the second end 420 and improving the reliability of the display panel.

[0043] Optionally, based on the above embodiments, see also... Figure 2 The first type of trace 40 extends from the first main surface S1 through the side surface S3 to the second main surface S2, and the first type of trace 40 extends from the second main surface S2 through the side surface S3 to the first main surface S1.

[0044] Specifically, such as Figure 2As shown, the first type of trace 40 extends from the first main surface S1 through the side surface S3 to the second main surface S2, and then extends from the second main surface S2 through the side surface S3 back to the first main surface S1 via the arc-shaped connecting structure 4201, forming a test loop. This test loop is used to simulate the physical path and trace shape of the second type of trace 50 (side trace). During automatic testing, the electrical information of the first type of trace 40 is detected to reflect the electrical information of the second type of trace 50, thus providing a means of detection and verification for the design of the second type of trace 50 in the display panel, facilitating the design optimization of the second type of trace 50. In addition, during the manufacturing process, the "U-shaped" test loop formed by the first type of trace 40 can be integrally manufactured in the same process, without the need to use multiple processes to manufacture the portions of the first type of trace 40 located on the first main surface S1, the portions located on the second main surface S2, and the portions located on the side surface S3, saving manufacturing steps. In addition, the second type of trace 50 is a side trace used to transmit signals from the second main surface S2 to the first main surface S1. The first type of pad 30 is located near the side surface S3 of the light-emitting element 20, thereby facilitating signal transmission between the light-emitting element 20 and the second type of trace 50. In this embodiment of the invention, the second type of trace 50 and the first type of trace 40 are integrally prepared in the same process. For example, a film is first attached to the substrate, the film is fixed by hot pressing, and a metal layer is deposited. Finally, a film removal process is performed to simultaneously prepare the first type of trace 40 and the second type of trace 50. On the one hand, the process flow can be further saved, thereby reducing production costs. On the other hand, the first type of trace 40 and the second type of trace 50 adopt the same process conditions, reducing process deviation and ensuring that the final test results of the first type of trace 40 can truly reflect the actual performance of the second type of trace 50.

[0045] It should be noted that the line width of the first type of trace 40 can be 40μm~70μm. The line width of the first type of trace 40 and the line width of the second type of trace 50 can be the same or different. This invention does not impose any restrictions on this.

[0046] Optionally, based on the above embodiments, see also... Figure 2 The first type of trace 40 also includes a first connecting portion 430 and a second connecting portion 440 for electrical connection. The first connecting portion 430 is located on the side surface S3, and the second connecting portion 440 is located on the second main surface S2. Different first ends 410 are electrically connected to the arc-shaped connection structure 4201 through the corresponding first connecting portion 430 and second connecting portion 440.

[0047] Specifically, such as Figure 2As shown, the first type of trace 40 also includes a first connecting portion 430 located on the side surface S3 and a second connecting portion 440 located on the second main surface S2. The first end 410 is electrically connected to the arc-shaped connecting structure 4201 through the first connecting portion 430 and the second connecting portion 440. Furthermore, as... Figure 2 In the illustrated embodiment, the two first ends 410 are electrically connected to the arc-shaped connection structure 4201 via corresponding first connecting portions 430 and second connecting portions 440, thereby forming a test circuit. The two first ends 410 serve as the test signal input terminals of the test circuit. The connection status between the first end 410 and the first connecting portion 430, the connection status between the first connecting portion 430 and the second connecting portion 440, and the connection status between the second connecting portion 440 and the arc-shaped connection structure 4201 are detected through the two electrically connected first ends 410. This reflects the connection status and electrical information of the second type of trace 50 on the first main surface S1, the second main surface S2, and the side surface S3, ensuring a simple automatic testing method.

[0048] Optionally, based on the above embodiments, see also... Figure 2 The second connecting portion 440 includes a first portion 4401 and a second portion 4402. The first portion 4401 is electrically connected to the arc-shaped connecting structure 4201 through the second portion 4402. The first portion 4401 and the second portion 4402 extend in the same direction. Specifically, as shown... Figure 2 In the embodiment shown, the second connecting portion 440 located on the second main surface S2 includes a first portion 4401 and a second portion 4402 that are electrically connected, wherein the first portion 4401 and the second portion 4402 extend in the same direction, so that the second connecting portion 440 as a whole forms a "U" shaped structure, thereby reducing the risk of damaging the second connecting portion 440 during the peeling process.

[0049] Optionally, in yet another embodiment, Figure 3 This is a schematic diagram of another display panel provided in an embodiment of the present invention. See also... Figure 3 The second connecting portion 440 includes a first portion 4401 and a second portion 4402. The first portion 4401 is electrically connected to the arc-shaped connecting structure 4201 through the second portion 4402. The extending directions of the first portion 4401 and the second portion 4402 intersect. Specifically, as shown... Figure 3 In the embodiment shown, the extension directions of the first portion 4401 and the second portion 4402 intersect, thereby forming a bent trace on the second main surface S2, which can more realistically reflect the stripping situation of the second type of trace 50.

[0050] Optionally, based on the above embodiments, Figure 4 This is a schematic diagram of another display panel provided in an embodiment of the present invention. See also... Figure 2and Figure 4 The first end 410 is located on the side of the first type of pad 30 near the edge of the display panel. The first end 410 satisfies at least one of the following: the first end 410 extends along the first direction X, or, along a direction perpendicular to the plane of the display panel, the first end 410 overlaps with the second type of pad 60.

[0051] For example, such as Figure 2 In the illustrated embodiment, taking the first type of trace 40 directly receiving external test signals as an example, the first type of trace 40 includes a portion located on the first main surface S1. This portion extends from one edge of the first main surface S1 to the other edge. In other words, the portion of the first type of trace 40 located on the first main surface S1 includes a portion extending along the first direction X and a portion extending along the second direction Y. The portion extending along the first direction X is designated as the first end 410 of the first type of trace 40. At this time, the first end 410 extends from a set position along the first direction X to the edge of the first main surface S1, and thus the dimension of the first end 410 along the first direction X is greater than the dimension of the first end 410 along the second direction Y. It can be understood that at this time, the dimension of the first type of pad 30 along the first direction X is smaller than the dimension of the first type of pad 30 along the second direction Y, thereby ensuring that the width-to-length ratio W1 / L1 of the first end 410 is large. During automatic testing, the first end 410 with a larger width and length ratio makes it easier for the automatic testing equipment to quickly identify the specific position of the first end 410, thereby facilitating the determination of the position of the test pad. Alternatively, the first end 410 with a larger width and length ratio can provide a larger buffer zone in the first direction X, which can reduce the alignment difficulty of the automatic testing equipment, improve the robustness and speed of the automatic testing equipment docking, thereby improving the testing efficiency and the reliability of the display panel.

[0052] For example, such as Figure 4In the illustrated embodiment, taking the first type of trace 40 receiving external test signals via an overlap pad as an example, the portion of the first type of trace 40 located on the first main surface S1 extends along the second direction Y and overlaps at least partially with the second type of pad 60 along a direction perpendicular to the plane of the display panel. The second type of pad 60 can be an overlap pad, which is not connected to the signal line O1 on the first main surface S1 and is only used for signal testing of the first type of trace 40. In this embodiment, since the first type of trace 40 receives external test signals via the second type of pad 60, the portion of the first type of trace 40 located on the first main surface S1 that overlaps with the second type of pad 60 is designated as the first end portion 410. At this time, since the second type of pad 60 covers the portion of the first type of trace 40 located on the first main surface S1, the dimension of the first end portion 410 along the first direction X remains unchanged, while its dimension along the second direction Y is smaller than the dimension of the second type of pad 60 along the second direction Y. That is, the overall width-to-length ratio W1 / L1 of the first end portion 410 is increased. During automatic testing, the first end 410 with a larger width and length ratio makes it easier for the automatic testing equipment to quickly identify the specific position of the first end 410, thereby facilitating the determination of the position of the test pad. Alternatively, the first end 410 with a larger width and length ratio can provide a larger buffer zone in the first direction X, which can reduce the alignment difficulty of the automatic testing equipment, improve the robustness and speed of the automatic testing equipment docking, thereby improving the testing efficiency and the reliability of the display panel.

[0053] Optionally, based on the above embodiments, see also... Figure 2 and Figure 4 W1 / L1 > 1, meaning that the dimension of the first end 410 along the first direction X is greater than the dimension of the first end 410 along the second direction Y. At this time, the dimension of the first type of pad 30 along the first direction X is less than the dimension of the first type of pad 30 along the second direction Y. That is, the width-to-length ratio of the first type of pad 30 is large, which facilitates the automatic detection requirements of the automatic testing equipment.

[0054] Understandably, see [link / reference] Figure 2 and Figure 4 The dimension of the first end 410 along the first direction X is greater than or equal to the dimension of the first type of pad 30 along the first direction X, i.e., W1 ≥ W2, and the dimension of the first end 410 along the second direction X is less than the dimension of the first type of pad 30 along the second direction Y, i.e., L1 < L2. This ensures that the aspect ratio of the first end 410 is greater than the aspect ratio of the first type of pad 30, improving detection efficiency and the reliability of the display panel. It should be noted that... Figure 4 The illustration is exemplified only by the example that the width of the second type trace 50 overlapping the first type pad 30 is less than or equal to the width of the first type pad 30, but this is not a limitation. In other embodiments, Figure 5This is a schematic diagram of another display panel structure provided in an embodiment of the present invention, such as... Figure 5 As shown, the width of the second type trace 50 overlapping the first type pad 30 can be greater than the width of the first type pad 30. In this case, the width of other parts of the second type trace 50 can be less than the width of the first type pad 30. In yet another embodiment, Figure 6 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention, such as... Figure 6 As shown, the width of the second type of trace 50 is the same and is greater than the width of the first type of pad 30.

[0055] It should also be noted that the above embodiments are only exemplified by the case where the first type of pad 30 is located only on one side of the area where the light-emitting element 20 is located. In other embodiments, Figure 7 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention, such as... Figure 7 As shown, the first type of pad 30 can also be located on opposite sides of the area where the light-emitting element 20 is located. Similarly, the first end 310 can also be located on opposite sides of the area where the light-emitting element 20 is located, and corresponding to the first type of pad 30. The present invention does not limit this, and those skilled in the art can set it as needed.

[0056] Optionally, based on the above embodiments, Figure 8 This is a cross-sectional schematic diagram of a first type of solder pad provided in an embodiment of the present invention. See also... Figure 8 The display panel also includes a first metal layer 101, a second metal layer 102, and a third metal layer 103 located on one side of the substrate 10. The first metal layer 101 is located on the side of the second metal layer 102 closer to the substrate 10, and the third metal layer 103 is located on the side of the second metal layer 102 away from the substrate 10. The first type of pad 30 includes an electrically connected first pad layer 310, a second pad layer 320, and a third pad layer 330. The first pad layer 310 is located on the first metal layer 101, the second pad layer 320 is located on the second metal layer 102, and the third pad layer 330 is located on the third metal layer 103. The third pad layer 330 includes a third edge L3 near the side surface S3. At the third edge L3, the third pad layer 330 covers the second pad layer 320 to form a first step T1. Along a direction perpendicular to the plane of the display panel, the first pad layer 310 covers the first step T1.

[0057] Specifically, Figure 8 An exemplary cross-sectional view of the display panel is used for illustration, such as... Figure 8As shown, the substrate 10 includes a first main surface S1, a second main surface S2, and a side surface S3. The first main surface S1 and the second main surface S2 are located in different planes, and both the plane containing the first main surface S1 and the plane containing the second main surface S2 are perpendicular to the plane containing the side surface S3. The display panel includes a first metal layer 101, a second metal layer 102, and a third metal layer 103 located on one side of the substrate 10. The second metal layer 102 is located between the first metal layer 101 and the third metal layer 103, and the first metal layer 101 is located on the side of the second metal layer 102 closest to the substrate 10. The first type of pad 30 includes a first pad layer 310, a second pad layer 320, and a third pad layer 330 that are electrically connected. The first pad layer 310 is located on the first metal layer 101, the second pad layer 320 is located on the second metal layer 102, and the third pad layer 330 is located on the third metal layer 103. An interlayer insulating layer is provided between the first pad layer 310 and the second pad layer 320. The second pad layer 320 is electrically connected to the first pad layer 310 through a via located in the interlayer insulating layer. The third pad layer 330 covers the second pad layer 320 and is in contact with the second pad layer 320 for electrical connection. This ensures that the signal transmitted to the first type of pad 30 can be transmitted through each metal layer to the signal line located on the corresponding metal layer, thereby realizing the signal transmission from the second main surface S2 to the first main surface S1. In existing technologies, there are situations where, along a direction perpendicular to the plane of the display panel, the third pad layer covers the second pad layer, and the second pad layer covers the first pad layer. That is, the third edge of the third pad layer overlaps the edge of the second pad layer, creating a first step, and the edge of the second pad layer overlaps the edge of the first pad layer, creating a second step. If the positions of the first and second steps are close together, the height difference between the steps will be large. Therefore, the side traces placed on the first type of pads are prone to breakage at the step positions. In other words, due to the large step height difference between the overlapping pad film layers in existing technologies, the side traces are prone to metal peeling and breakage. It is necessary to optimize the design of the pad step height. Furthermore, in this embodiment of the invention, the first pad layer 310 is extended on the original basis so that the first pad layer 310 is close to the edge of the side surface S3 and extends beyond the first step T1 formed by the third pad layer 330. In other words, along the direction perpendicular to the plane where the display panel is located, the first pad layer 310 covers part or completely covers the first step T1. Thus, at the position of the first step T1, the second pad layer 320 cannot cover the first pad layer 310 to form the second step, thereby reducing the height difference at the position of the first step T1, reducing the risk of the side trace breaking at the position of the first step T1, and improving the manufacturing yield of the side trace.

[0058] It should be noted that, in the above embodiments, the size of the first type of pad 30 is determined by the size of the first pad layer 310, that is, the boundary position of the first pad layer 310 is the boundary position of the first type of pad 30. However, the present invention does not limit this. In other embodiments, the size of the first type of pad 30 can also be determined by the size of other pad layers. Those skilled in the art can set it as needed.

[0059] It should also be noted that, Figure 9 This is a top view of a first type of solder pad provided in an embodiment of the present invention. See also... Figure 8 and Figure 9 Along a direction perpendicular to the plane of the display panel, the third pad layer 330 completely covers the second pad layer 320. The second pad layer 320 partially overlaps with the first pad layer 310, and the third pad layer 330 partially overlaps with the first pad layer 310. Specifically, the first pad layer 310, the second pad layer 320, and the third pad layer 330 can all be quadrilaterals. In this case, the first side 3101 of the first pad layer 310 extends beyond the coverage of the third pad layer 330, while the other three sides are covered by the second pad layer 320. At this time, the first side 3101 of the first pad layer 310 covers part of the first step T1, thereby reducing the risk of the side trace breaking at the position of the first side 3101 in the first pad layer 310.

[0060] Optionally, in yet another embodiment, Figure 10 This is a top view of another type of first-class solder pad provided in an embodiment of the present invention. See also... Figure 8 and Figure 10 Along a direction perpendicular to the plane of the display panel, the third pad layer 330 completely covers the second pad layer 320. The second pad layer 320 partially overlaps with the first pad layer 310, and the third pad layer 330 partially overlaps with the first pad layer 310. Specifically, the first pad layer 310, the second pad layer 320, and the third pad layer 330 can all be quadrilaterals. Therefore, the first side 3101, the second side 3102, and the third side 3103 of the first pad layer 310 all exceed the coverage area of ​​the third pad layer 330, and the last side partially overlaps with the third pad layer 330. At this time, the first pad layer 310 covers part of the first step T1, thereby reducing the risk of breakage of the side traces at the positions of the first side 3101, the second side 3102, and the third side 3103 in the first pad layer 310.

[0061] Optionally, in yet another embodiment, Figure 11 This is a top view of another type of first-class solder pad provided in an embodiment of the present invention. See also... Figure 8 and Figure 11Along a direction perpendicular to the plane of the display panel, the third pad layer 330 completely covers the second pad layer 320, and the first pad layer 310 completely covers the third pad layer 330. Thus, the first pad layer 310 completely covers the first step T1 formed by the third pad layer 330 and the second pad layer 320 at four side positions, thereby reducing the risk of side traces breaking at the four side positions of the first type of pad 30.

[0062] Optionally, based on the above embodiments, see also... Figure 8 The first pad layer 310 includes a fifth edge L5 near the side surface S3. The horizontal distance between the third edge L3 and the fifth edge L5 is greater than or equal to 1 μm. Specifically, in this embodiment of the invention, by setting the horizontal distance between the third edge L3 and the fifth edge L5 to be greater than or equal to 1 μm, it is ensured that the extended distance of the first pad layer 310 can partially or completely cover the first step T1, thereby reducing the risk of side trace breakage at the first step T1.

[0063] Optionally, based on the above embodiments, Figure 12 This is a cross-sectional schematic diagram of another type of first-class pad provided in an embodiment of the present invention. See also... Figure 12 The second pad layer 320 includes a fourth edge L4 near the side surface S3, and the first pad layer 310 includes a fifth edge L5 near the side surface S3. The first pad layer 310 has a first length D1 along the second direction Y. The horizontal distance D2 between the fourth edge L4 and the fifth edge L5 is less than or equal to D1 / 3.

[0064] For example, such as Figure 12In the illustrated embodiment, the second pad layer 320 can be further reduced inward, i.e., the horizontal distance D2 between the fourth edge L4 and the fifth edge L5 is less than or equal to D1 / 3. This reduces the second pad layer 320 to at least two-thirds the size of the first pad layer 310, thus misaligning the first step T1 with the fifth edge L5. This prevents the second pad layer 320 from covering the first pad layer 310 at the position of the first step T1, reducing the height difference at the first step T1 and thereby reducing the risk of side trace breakage at the first step T1. It is understood that the height difference at the first step T1 can be reduced by reducing the second pad layer 320 while keeping the size of the first pad layer 310 unchanged. Alternatively, the height difference at the first step T1 can be reduced by extending the first pad layer 310 and then reducing the second pad layer 320. This invention does not limit this; those skilled in the art can configure it as needed. It should be noted that while setting the second pad layer 320 to be recessed, a third pad layer 330 can also be set to cover the first pad layer 310. The third pad layer 330 is a pad layer that overlaps with the side trace. By setting the third pad layer 330 to cover the first pad layer 310, the third pad layer 330 has a sufficiently long width along the second direction Y, thereby ensuring that the first type of pad 30 and the side trace have sufficient overlap area, and improving the overlap effect between the first type of pad 30 and the side trace.

[0065] Optionally, based on the above embodiments, Figure 13 This is a schematic diagram of another display panel provided in an embodiment of the present invention. See also... Figure 13 The substrate 10 includes a first main surface S1, a second main surface S2, and a side surface S3. The display panel also includes a second type of trace 50, which includes a third end 510. The third end 510 is located on the side of the first main surface S1 away from the second main surface S2, and overlaps with the first type of pad 30 in a direction perpendicular to the plane of the display panel.

[0066] Specifically, such as Figure 13As shown, the display panel also includes a second type of trace 50, which can be a side trace used to transmit signals from the second main surface S2 to the first main surface S1. For example, the second type of trace 50 includes a third end 510 located on the first main surface S1. Along a direction perpendicular to the plane of the display panel, the third end 510 overlaps with a first type of pad 30, thereby electrically connecting the third end 510 to the first type of pad 30. The first type of pad 30 is also electrically connected to the signal line 01. Thus, signals from the second main surface S2 (such as signals transmitted by the driver chip on the second main surface S2) are transmitted through the second type of trace 50 to the first type of pad 30, and then through the first type of pad 30 and the signal line 01 to the light-emitting element 20, thereby ensuring the normal operation of the display panel.

[0067] Optionally, based on the above embodiments, see also... Figure 13 The first type of trace 40 and the second type of trace 50 are arranged on the same layer. Specifically, the first type of trace 40 and the second type of trace 50 can be fabricated simultaneously in the same manufacturing process, eliminating the need to create separate masks for the first type of trace 40 and the second type of trace 50, thus saving process steps and reducing production costs. Furthermore, see [link to documentation]. Figure 13 The edge of the first end 410 away from the side surface S3 is flush with the edge of the third end 510 away from the side surface S3. Specifically, the alignment of the outer edges of the first end 410 and the third end 510 indicates that on the same photomask, the outer edges of the first end 410 and the third end 510 can be designed in a straight line, which simplifies the layout design. Furthermore, during the patterning process of the film material, the influence of process parameters on the first end 410 and the third end 510 is synchronous and uniform, reducing the risk of relative positional deviation due to process fluctuations and improving the stability and yield of the process.

[0068] Optionally, based on the above embodiments, see [link to relevant documentation]. Figure 2 The second type of trace 50 also includes an electrical connection trace 520 and a fan-out trace 530. The connection trace 520 includes a portion located on the side surface S3 and a portion located on the second main surface S2. The fan-out trace 530 is located on the second main surface S2, and there is a situation where the extension direction of the fan-out trace 530 intersects with the extension direction of the connection trace 520.

[0069] Specifically, such as Figure 2As shown, the second type of trace 50 also includes a connecting trace 520 and a fan-out trace 530, wherein the connecting trace 520 connects the third end 510 and the fan-out trace 530. The connecting trace 520 includes a portion located on the side surface S3 and a portion located on the second main surface S2, and the extension direction of the portion of the connecting trace 520 located on the side surface S3 is the same as the extension direction of the portion located on the second main surface S2. The extension direction of the fan-out trace 530 located on the second main surface S2 intersects with the extension direction of the connecting trace 520, thereby forming a bent trace on the second main surface S2, which can reduce the bending stress of the second type of trace 50 on the second main surface S2, thereby reducing the risk of damage to the second type of trace 50 during the stripping process.

[0070] Optional, see below Figure 13 The fan-out routing 530 includes a first fan-out routing 5301 and a second fan-out routing 5302. The extension direction of the first fan-out routing 5301 intersects the extension direction of the connecting routing 520, and the extension direction of the second fan-out routing 5302 intersects the extension direction of the first fan-out routing 5301. The angle between the first fan-out routing 5301 and the connecting routing 520 is greater than or equal to 130°, and the angle between the first fan-out routing 5301 and the second fan-out routing 5302 is greater than or equal to 130°.

[0071] Specifically, such as Figure 13 In the illustrated embodiment, the fan-out trace 530 includes a first fan-out trace 5301 and a second fan-out trace 5302 whose extension directions intersect, and the connecting trace 520 is electrically connected to the second fan-out trace 5302 through the first fan-out trace 5301. In this embodiment of the invention, by setting the angle between the first fan-out trace 5301 and the connecting trace 520 to be greater than or equal to 130°, and the angle between the first fan-out trace 5301 and the second fan-out trace 5302 to be greater than or equal to 130°, obtuse angles are formed at the bending positions of the first fan-out trace 5301 and the connecting trace 520, and at the bending positions of the first fan-out trace 5301 and the second fan-out trace 5302. This can further reduce the bending stress of the second type of trace 50 on the second main surface S2, thereby reducing the risk of damaging the second type of trace 50 during the stripping process.

[0072] Optionally, based on the above embodiments, Figure 14 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention. See also... Figure 14 The display panel also includes a plurality of third-class traces 70, which are located on the side of the first-class traces 40 away from the second-class traces 50 and are insulated.

[0073] Specifically, such as Figure 14As shown, the third type of trace 70 can be a virtual trace, meaning it is isolated from other devices and does not participate in the normal operation of the display panel. The third type of trace 70 may include a portion located on the side surface S3 and a portion located on the second main surface S2, and it is located on the side of the first type of trace 40 away from the second type of trace 50. Because uneven heating can occur during the film application process of the test traces (i.e., the central area is heated more and is easier to peel off, while the edge areas are heated less and are more likely to be damaged during peeling), the third type of trace 70 is placed at the outermost edge. Even if peeling damage occurs, it is a virtual trace that is damaged and does not affect the normal operation of the display panel, reducing the risk of damaging the test traces during peeling. Furthermore, multiple third type traces 70 are arranged along the first direction X, with a linewidth greater than or equal to 40μm and a spacing between adjacent third type of connecting traces 70 greater than or equal to 40μm, thus ensuring that the third type of trace 70 can provide normal protection.

[0074] Based on the same inventive concept, embodiments of the present invention also provide a display master. Figure 15 This is a schematic diagram of a display master provided in an embodiment of the present invention. See also: Figure 15 The display master includes a substrate 10, a light-emitting element 20, a first type of pad 30, a first type of trace 40, and a third type of pad 80. The substrate 10 includes a display area AA and a cut area BB, with the cut area BB located on at least one side of the display area AA. The light-emitting element 20 is located on one side of the substrate 10 and within the display area AA. The first type of pad 30 is located on the same side of the substrate 10 as the light-emitting element 20 and within the display area AA. The third type of pad 80 is located on the same side of the substrate 10 as the light-emitting element 20 and within the cut area BB. The first type of trace 40 includes a first end 410, which is located on the same side of the substrate 10 as the first type of pad 30, and the first type of trace 40 is coupled to the third type of pad 80. The first type of pad 30 and the first end 410 are arranged along the first direction X. Along the first direction X, the first end 410 and the first type of pad 30 at least partially overlap. The dimension of the first end 410 along the first direction X is W1, the dimension of the first type of pad 30 along the first direction X is W2, the dimension of the first end 410 along the second direction Y is L1, and the dimension of the first type of pad 30 along the second direction Y is L2. Wherein, the first direction X and the second direction Y intersect, and W1 / L1 > W2 / L2.

[0075] Specifically, such as Figure 15As shown, the substrate 10 in the display master may include a first main surface S1, which can be the light-emitting side surface of the display master. Specifically, the first main surface S1 includes a display area AA and a cutting area BB. The display area AA includes multiple light-emitting elements 20, signal lines 01, and first-type pads 30. The first-type pads 30 are pads that provide signals inside the display panel. Specifically, the first-type pads 30 are electrically connected to the light-emitting elements 20 through the signal lines 01, thereby providing various driving signals to the signal lines 01 to drive the multiple light-emitting elements 20 to emit light and achieve image display. Additionally, the display master also includes first-type traces 40, which can be test traces. Test traces are traces integrated into the display panel during the manufacturing process and are not part of the traces that implement the display function of the display panel. Instead, they are used to provide reliable electrical access points for automatic testing equipment. The cutting area BB includes multiple third-type pads 80. The first-type traces 40 are coupled to the third-type pads 80, thereby providing electrical access points for automatic testing equipment in the cutting area BB. In existing technologies, test points for test traces are set on the bonding surface of the display master. During testing, the display master needs to be flipped so that its front (display surface) faces down, which can damage the orientation of the traces in the display area of ​​the display master. Furthermore, conventional traces are small in size, placing high demands on the optical positioning and physical contact of automated testing equipment, which can easily lead to alignment failures, poor contact, or slow testing speeds, increasing the risk of misjudgment and testing time.

[0076] Therefore, in this embodiment of the invention, the first type of trace 40 includes a first end 410. The first end 410 and the first type of pad 30 are located on the same side of the substrate 10, that is, the first end 410 is located on the first main surface S1 of the substrate 10. The first end 410 and the test pad 80 are both test signal input terminals of the first type of trace 40. In this way, by setting the first end 410 and the test pad 80 on the front side of the display master, during automatic testing, the test pin position of the probe in the automatic testing equipment is located on the front side of the display master. When testing through the first type of trace 40, there is no need to flip the display master. The pins can be directly inserted from the front side of the display master to match the test requirements, thereby avoiding the risk of damaging the circuits in the display area AA when the front side of the display master is facing down during testing, and improving the reliability of automatic testing. Furthermore, the first type of pad 30 and the first end 410 are arranged along the first direction X. Along the first direction X, the first end 410 and the first type of pad 30 at least partially overlap, thereby placing the first end 410 in the area close to the first type of pad 30, so that the first end 410 is located in the area away from the light-emitting element 20, avoiding the risk of electrostatic damage to the light-emitting element 20 during testing due to the first end 410 being too close to the light-emitting element 20.

[0077] Furthermore, the dimension of the first end 410 along the first direction X is W1, and the dimension of the first type of pad 30 along the first direction X is W2. This can be understood as the width of the first end 410 being W1 and the width of the first type of pad 30 being W2. Similarly, the dimension of the first end 410 along the second direction Y is L1, and the dimension of the first type of pad 30 along the second direction Y is L2. This can be understood as the length of the first end 410 being L1 and the length of the first type of pad 30 being L2. Therefore, the width-to-length ratio W1 / L1 of the first end 410 is greater than the width-to-length ratio W2 / L2 of the first type of pad 30. Since the first end 410 is the test signal input terminal of the first type of trace 40, by setting the width-to-length ratio of the first end 410 to be larger, it is easier to meet the automatic detection needs of automatic testing equipment, thereby improving the production yield detection efficiency and the reliability of the display panel.

[0078] It should be noted that, Figure 15 The example given is exemplified by directly connecting the first end 410 to the third type pad 80, but this is not a limitation. In other embodiments, the portion of the first type trace 40 located on the first main surface S1 can also be electrically connected to the third type pad 80 via overlapping pads. Those skilled in the art can configure this as needed.

[0079] It should also be noted that, such as Figure 15 In the embodiment shown, the third type of pad 80 is arranged along the first direction X, the first type of pad 30 is arranged along the first direction X, and the third type of pad 80 is directly electrically connected to the first type of trace 40. This allows the third type of pad 80, the first type of trace 40, and the second type of trace 50 to be fabricated simultaneously in the same fabrication process, which helps to reduce process costs.

[0080] Optionally, in yet another embodiment, Figure 16 This is a schematic diagram of another display master structure provided in an embodiment of the present invention. See also... Figure 16 Multiple type 1 pads 30 are arranged along the first direction X, and multiple type 3 pads 80 are arranged along the second direction Y. Specifically, as shown... Figure 13 As shown, the arrangement direction of the first type of pad 30 intersects with the arrangement direction of the third type of pad 80, and the arrangement direction of the second type of pad 60 is the same as the arrangement direction of the first type of pad 30. Therefore, the third type of pad 80 is electrically connected to the first type of trace 40 through the second type of pad 60, ensuring that the connection method between the third type of pad 80 and the first type of trace 40 is simple.

[0081] Optional, see below Figure 16The display master also includes multiple fourth-type pads 90, which are located in the cut area BB and arranged along the second direction Y. Third-type pads 80 are located on the side of the fourth-type pads 90 near the side surface S3, and are arranged on the same layer as the third-type pads 80. Specifically, the fourth-type pads 90 can be test pads for testing the first and second power signal lines in the display master, and the third-type pads 80 are test pads for testing the first type of trace 40. Since the fourth-type pads 90 are typically arranged along the second direction Y in the cut area BB, some of the fourth-type pads 90 located near the side surface S3 can be used as third-type pads 80 to connect with the first type of trace 40, achieving loop resistance testing without the need to re-fabricate the third-type pads 80, thus reducing manufacturing costs.

[0082] Optional, see below Figure 15 Multiple third-type pads 80 are arranged along the first direction X. The length of each third-type pad 80 along the first direction X is W3, and the width of each third-type pad 80 along the second direction Y is L3. The length and width of the third-type pads satisfy W3 / L3≥5. Specifically, the third-type pads 80 are test pads used to receive test signals. Therefore, in this embodiment of the invention, the aspect ratio of the third-type pads 80 is set to be relatively large. During automatic testing, the larger aspect ratio of the third-type pads 80 allows the automatic testing equipment to quickly identify the specific location of the third-type pads 80, thus facilitating the determination of the test pad position. Alternatively, the larger aspect ratio of the third-type pads 80 can provide a larger buffer zone in the first direction X, reducing the alignment difficulty of the automatic testing equipment, improving the robustness and speed of the automatic testing equipment's docking, thereby improving the efficiency of production yield testing and the reliability of the display panel.

[0083] Optionally, based on the above embodiments, see also... Figure 15 Multiple first-type pads 30 are arranged along the first direction X, and the first-type pads 30 include the first pad 301 that is closest to the third-type pad 80.

[0084] The third type of pad 80 includes a second pad 810 that is closest to the first type of pad 30. The horizontal distance between the first pad 301 and the second pad 810 along the first direction X is greater than or equal to 2 mm. Specifically, during the testing of the display master, in order to avoid damage to the first type of pad 30 by the automatic testing equipment, the minimum distance between the first type of pad 30 and the third type of pad 80 is set to be greater than or equal to 2 mm, taking into account the size of the automatic testing equipment. That is, the distance between the first pad 301, which is closest to the third type of pad 80 in the first type of pad 30, and the second pad 810, which is closest to the first type of pad 30 in the third type of pad 80, is greater than or equal to 2 mm, thereby ensuring the reliability of the automatic testing.

[0085] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 17 This is a schematic diagram of a display device provided in an embodiment of the present invention. Figure 17 As shown, the display device can be a splicing display device, including the display panel 100 in the above embodiments. This display device includes the display panel 100 of any embodiment of the present invention; therefore, the display device provided by the embodiments of the present invention possesses the corresponding beneficial effects of the display panel 100 provided by the embodiments of the present invention, which will not be elaborated further here. For example, the display device can be an electronic device such as a mobile phone, computer, smart wearable device (e.g., smartwatch), and in-vehicle display device; the embodiments of the present invention do not limit this.

[0086] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, include Substrate, A light-emitting element is located on one side of the substrate; The first type of pad is located on the same side of the substrate as the light-emitting element; The first type of trace includes a first end, and the first end and the first type of pad are located on the same side of the substrate; The first type of pads and the first end are arranged along a first direction, and along the first direction, the first end and the first type of pads at least partially overlap; wherein, the dimension of the first end along the first direction is W1, the dimension of the first type of pad along the first direction is W2, the dimension of the first end along the second direction is L1, the dimension of the first type of pad along the second direction is L2, wherein the first direction and the second direction intersect, and W1 / L1 > W2 / L2.

2. The display panel according to claim 1, characterized in that, The substrate includes a first main surface, a second main surface, and a side surface, wherein the first main surface and the second main surface are disposed opposite to each other, and the side surface connects the first main surface and the second main surface; The first type of pad is located on the side of the first main surface away from the second main surface; The first type of trace includes a second end located on the side of the second main surface away from the first main surface, and the second end includes an arc-shaped connection structure.

3. The display panel according to claim 2, characterized in that, The first type of trace extends from the first main surface through the side surface to the second main surface, and the first type of trace extends along the second main surface through the side surface to the first main surface.

4. The display panel according to claim 2, characterized in that, The first type of trace also includes a first connection portion and a second connection portion for electrical connection, the first connection portion being located on the side surface and the second connection portion being located on the second main surface; Different first ends are electrically connected to the arc-shaped connection structure through corresponding first connecting parts and second connecting parts.

5. The display panel according to claim 4, characterized in that, The second connecting portion includes a first part and a second part, wherein the first part is electrically connected to the arc-shaped connecting structure through the second part; The first and second portions extend in the same direction.

6. The display panel according to claim 4, characterized in that, The second connecting portion includes a first part and a second part, wherein the first part is electrically connected to the arc-shaped connecting structure through the second part; The extension directions of the first and second portions intersect.

7. The display panel according to claim 1, characterized in that, The first end is located on the side of the first type of pad near the edge of the display panel, and the first end satisfies at least one of the following: The first end extends along the first direction; or Along a direction perpendicular to the plane of the display panel, the first end overlaps with the second type of pad.

8. The display panel according to claim 1, characterized in that, W1 / L1 > 1.

9. The display panel according to claim 1, characterized in that, W1 ≥ W2.

10. The display panel according to claim 1, characterized in that, The display panel further includes a first metal layer, a second metal layer, and a third metal layer located on one side of the substrate, wherein the first metal layer is located on the side of the second metal layer closer to the substrate, and the third metal layer is located on the side of the second metal layer away from the substrate; The first type of pad includes a first pad layer, a second pad layer, and a third pad layer for electrical connection; The first pad layer is located on the first metal layer, the second pad layer is located on the second metal layer, and the third pad layer is located on the third metal layer; The third pad layer includes a third edge near the side surface, whereby the third pad layer covers the second pad layer to form a first step, and the first pad layer covers the first step along a direction perpendicular to the plane of the display panel.

11. The display panel according to claim 10, characterized in that, The first pad layer includes a fifth edge near the side surface; The horizontal distance between the third edge and the fifth edge is greater than or equal to 1 μm.

12. The display panel according to claim 10, characterized in that, The second pad layer includes a fourth edge near the side surface, and the first pad layer includes a fifth edge near the side surface; The first pad layer has a first length D1 along the second direction; The horizontal distance between the fourth edge and the fifth edge is less than or equal to D1 / 3.

13. The display panel according to claim 1, characterized in that, The substrate includes a first main surface, a second main surface, and a side surface; The display panel further includes a second type of trace, which includes a third end located on the side of the first main surface away from the second main surface and overlaps with a first type of pad in a direction perpendicular to the plane of the display panel.

14. The display panel according to claim 13, characterized in that, The first type of trace and the second type of trace are set on the same layer.

15. The display panel according to claim 14, characterized in that, The edge of the first end away from the side surface is flush with the edge of the third end away from the side surface.

16. The display panel according to claim 13, characterized in that, The second type of routing also includes electrical connection routing and fan-out routing; The connection trace includes a portion located on the side surface and a portion located on the second main surface; The fan-out trace is located on the second main surface, and the extension direction of the fan-out trace intersects with the extension direction of the connecting trace.

17. The display panel according to claim 16, characterized in that, The fan-out routing includes a connected first fan-out routing and a second fan-out routing; The extension direction of the first fan-out routing line intersects with the extension direction of the connecting routing line, and the extension direction of the second fan-out routing line intersects with the extension direction of the first fan-out routing line. The angle between the first fan-out routing line and the connecting routing line is greater than or equal to 130°, and the angle between the first fan-out routing line and the second fan-out routing line is greater than or equal to 130°.

18. The display panel according to claim 13, characterized in that, The display panel also includes a plurality of third-type traces, which are located on the side of the first-type traces away from the second-type traces, and the third-type traces are insulated.

19. A display master, characterized in that, include: A substrate, the substrate including a display area and a dicing area, the dicing area being located on at least one side of the display area; A light-emitting element is located on one side of the substrate and in the display area; The first type of pad is located on the same side of the substrate as the light-emitting element and is located in the display area; The third type of pad is located on the same side of the substrate as the light-emitting element and is located in the cutting area; The first type of trace includes a first end, the first end and the first type of pad are located on the same side of the substrate, and the first type of trace is coupled to the third type of pad; The first type of pads and the first end are arranged along a first direction, and along the first direction, the first end at least partially overlaps with the first type of pads; wherein... The dimension of the first end along the first direction is W1, the dimension of the first type of pad along the first direction is W2, the dimension of the first end along the second direction is L1, and the dimension of the first type of pad along the second direction is L2, wherein the first direction and the second direction intersect, and W1 / L1 > W2 / L2.

20. The display master according to claim 19, characterized in that, Multiple first-type pads are arranged along the first direction, and multiple third-type pads are arranged along the second direction.

21. The display master according to claim 20, characterized in that, The display master includes a plurality of fourth type pads, which are located in the cutting area and are arranged along the second direction. The third type of pad is located on the side of the fourth type of pad that is close to the side surface, and the fourth type of pad is disposed on the same layer as the third type of pad.

22. The display master according to claim 19, characterized in that, The plurality of the third type of pads are arranged along a first direction, the length of the third type of pads along the first direction is W3, and the width of the third type of pads along the second direction is L3; The length and width of the third type of pad satisfy: W3 / L3≥5.

23. The display master according to claim 19, characterized in that, A plurality of first-type pads are arranged along a first direction, and the first-type pads include the first pad closest to the third-type pads; The third type of pad includes the second pad that is closest to the first type of pad; The horizontal distance between the first pad and the second pad along the first direction is greater than or equal to 2 mm.

24. A display device, characterized in that, Includes the display panel as described in any one of claims 1-18.

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