Display panel, display device and spliced display device

Abstract

A display panel (100) comprises a back plate (10), a plurality of light emitting devices (20), a plurality of first electrodes (30) and a plurality of connection traces (40). The back plate (10) comprises a first surface (10a), a second surface (10b) opposite to the first surface (10a), and a plurality of side surfaces (10c) connecting the first surface (10a) and the second surface (10b), wherein at least one of the plurality of side surfaces (10c) is a selected side surface (10cc). The plurality of light emitting devices (20) are disposed on the first surface (10a). The plurality of first electrodes (30) are disposed on the first surface (10a) and close to the selected side surface (10cc). Each of the plurality of connection traces (40) comprises a first segment (40a), a second segment (40b) and a third segment (40c) connected in sequence, the first segment (40a) is disposed on the first surface (10a), and the first segment (40a) is electrically connected to one of the plurality of first electrodes (30), the second segment (40b) is disposed on the selected side surface (10cc), and the third segment (40c) is disposed on the second surface (10b), and the third segment (40c) is electrically connected to a flexible printed circuit board (80).

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display panel, display device, and splicing display device. Background Technology

[0002] Micro LED (Micro Light Emitting Diode) is considered the third generation of display technology. However, due to technological challenges such as mass transfer and dead pixel repair, Micro LED displays cannot be manufactured in ultra-large sizes (e.g., for luxury display walls). Therefore, for such ultra-large displays, the best current solution is to splice together smaller displays. Summary of the Invention

[0003] On one hand, a display panel is provided, comprising: a back panel, a plurality of light-emitting devices, a plurality of first electrodes, and a plurality of first electrodes. The back panel includes a first surface, a second surface opposite to the first surface, and a plurality of side surfaces connecting the first and second surfaces, wherein at least one of the side surfaces is a selected side surface. The plurality of light-emitting devices are disposed on the first surface. The plurality of first electrodes are disposed on the first surface and are close to the selected side surface. Each connection trace includes a first segment trace, a second segment trace, and a third segment trace connected sequentially. The first segment trace is disposed on the first surface and electrically connected to one of the plurality of first electrodes. The second segment trace is disposed on the selected side surface, and the third segment trace is disposed on the second surface and electrically connected to a flexible circuit board.

[0004] It is understood that the first surface and the second surface are mutually parallel planes, while the side surface or selected side surface can be a plane, an arc surface, or a surface composed of a combination of at least one plane and at least one arc surface. For example, the side surface is composed of a plane portion and two arc portions, wherein the plane portion is perpendicular to the plane containing the first surface, and one of the two arc portions is used to connect the plane portion to the first surface, and the other of the two arc portions is used to connect the plane portion to the second surface. This disclosure does not limit this.

[0005] In some embodiments, the third trace includes a first sub-segment, a second sub-segment, and a third sub-segment connected sequentially, with the first sub-segment located near a selected side. Multiple first sub-segments of the connecting traces are arranged side-by-side, and multiple third sub-segments of the connecting traces are arranged side-by-side; the extension direction of the first sub-segment intersects the extension direction of the second sub-segment, and the extension directions of the second and third sub-segments intersect; the angle formed between the extension directions of the first and second sub-segments ranges from 90° to 180°.

[0006] In some embodiments, the first sub-segment and the second sub-segment are connected by a first connecting portion. The first connecting portion includes opposing first inner surfaces and first outer surfaces. The orthographic projection of the first inner surface onto the back plate is a first inner edge, and the orthographic projection of the first outer surface onto the back plate is a first outer edge. The first sub-segment includes opposing first sub-segment inner surfaces and first sub-segment outer surfaces. The orthographic projection of the first sub-segment inner surface onto the back plate is the first sub-segment inner edge, and the orthographic projection of the first sub-segment outer surface onto the back plate is the first sub-segment outer edge. The second sub-segment includes opposing second sub-segment inner surfaces and second sub-segment outer surfaces. The orthographic projection of the second sub-segment inner surface onto the back plate is the second sub-segment inner edge, and the orthographic projection of the second sub-segment outer surface onto the back plate is the second sub-segment outer edge. The first inner edge connects to the first sub-segment inner edge and the second sub-segment inner edge, and the first outer edge connects to the first sub-segment outer edge and the second sub-segment outer edge.

[0007] In some embodiments, the first inner edge is a curve; and / or, the first outer edge is a curve.

[0008] In some embodiments, the first inner edge is an arc; and / or, the first outer edge is an arc.

[0009] In some embodiments, the first inner edge includes a plurality of line segments connected end to end, and the angle formed between one of the line segments of the first inner edge and the inner edge of the first sub-line segment is in the range of 170° to 177°. The angle formed between two connected line segments of the first inner edge is in the range of 170° to 177°. The angle formed between one of the line segments of the first inner edge and the inner edge of the second sub-line segment is in the range of 170° to 177°.

[0010] In some embodiments, the first outer edge includes a plurality of line segments connected end to end, and the angle formed between one of the line segments of the first outer edge and the outer edge of the first sub-line segment is in the range of 170° to 177°. The angle formed between two connected line segments of the first outer edge is in the range of 170° to 177°. The angle formed between one line segment of the first outer edge and the outer edge of the second sub-line segment is in the range of 170° to 177°.

[0011] In some embodiments, the angle formed between the extension direction of the third sub-segment and the extension direction of the second sub-segment ranges from 90° to 180°.

[0012] In some embodiments, the third sub-segment and the second sub-segment are connected by a second connecting portion. The second connecting portion includes opposing second inner and second outer sides. The orthographic projection of the second inner side onto the back plate is a second inner edge, and the orthographic projection of the second outer side onto the back plate is a second outer edge. The third sub-segment includes opposing third sub-segment inner and outer sides. The orthographic projection of the third sub-segment inner side onto the back plate is the third sub-segment inner edge, and the orthographic projection of the third sub-segment outer side onto the back plate is the third sub-segment outer edge. The second sub-segment includes opposing second sub-segment inner and second sub-segment outer sides. The orthographic projection of the second sub-segment inner side onto the back plate is the second sub-segment inner edge, and the orthographic projection of the second sub-segment outer side onto the back plate is the second sub-segment outer edge. The second inner edge connects to the inner edge of the third sub-segment and the inner edge of the second sub-segment, and the third outer edge connects to the outer edge of the third sub-segment and the outer edge of the second sub-segment.

[0013] In some embodiments, the second inner edge is a curve; and / or, the second outer edge is a curve.

[0014] In some embodiments, the second inner edge is an arc, and / or the second outer edge is an arc.

[0015] In some embodiments, the second inner edge includes multiple line segments connected end-to-end, and the angle formed between one of the multiple line segments of the second inner edge and the inner edge of the third sub-line segment is in the range of 170° to 177°. The angle formed between two connected line segments of the multiple line segments of the second inner edge is in the range of 170° to 177°. The angle formed between one of the multiple line segments of the second inner edge and the inner edge of the second sub-line segment is in the range of 170° to 177°.

[0016] In some embodiments, the second outer edge comprises a plurality of line segments connected end-to-end, and the angle formed between one of the line segments of the second outer edge and the outer edge of the third sub-line segment is in the range of 170° to 177°. The angle formed between two connected line segments of the second outer edge is in the range of 170° to 177°. The angle formed between one of the line segments of the second outer edge and the outer edge of the second sub-line segment is in the range of 170° to 177°.

[0017] In some embodiments, multiple connection traces are divided into at least one connection trace group, and each connection trace group includes at least two connection traces. In each connection trace group, the extension direction of the first sub-segment is the same as the extension direction of the third sub-segment, and the distance between the outer edges of the third sub-segments of the two farthest connection traces is less than the distance between the outer edges of the first sub-segments of the two farthest connection traces.

[0018] In some embodiments, in two adjacent connecting traces within the same connecting trace group, the distance between two adjacent third sub-segments is less than the distance between two adjacent first sub-segments. Specifically, the distance between two adjacent third sub-segments is the spacing between the outer edge of one third sub-segment and the inner edge of the other third sub-segment; and the outer edge of one third sub-segment and the inner edge of the other third sub-segment are close to each other. Similarly, the distance between two adjacent first sub-segments is the spacing between the outer edge of one first sub-segment and the inner edge of the other first sub-segment; and the outer edge of one first sub-segment and the inner edge of the other first sub-segment are close to each other.

[0019] In some embodiments, in two adjacent connection routing groups, the distance between the outer edges of the third sub-segments of the two closest connection routings is greater than 1000 μm.

[0020] In some embodiments, the second surface forms an edge at the junction with each of the plurality of side surfaces, wherein the second surface forms a selected edge at the junction with a selected side surface; the two edges adjacent to the selected edge are a first edge and a second edge; among the plurality of connection traces, the distance between the third sub-segment of the connection trace closest to the first edge and the first edge is greater than or equal to 100 μm. Among the plurality of connection traces, the distance between the third sub-segment of the connection trace closest to the second edge and the second edge is greater than or equal to 100 μm.

[0021] In some embodiments, in a connection wiring group, the distance between the first sub-segments of two adjacent connection wirings is 10 to 60 μm.

[0022] In some embodiments, in a connection routing group, the distance between the third sub-segments of two adjacent connection routings is greater than or equal to 10 μm.

[0023] In some embodiments, the ratio of the dimension of the first electrode in the direction perpendicular to its extension direction to the dimension of the connection trace electrically connected to the first electrode in the direction perpendicular to its extension direction is between 1 and 3.

[0024] In some embodiments, the angle between the extension direction of the first sub-segment and the extension direction of the second sub-segment is in the range of 100° to 180°, and the angle between the extension direction of the third sub-segment and the extension direction of the second sub-segment is in the range of 100° to 180°; the dimension of the second sub-segment along its extension direction is greater than or equal to 100 μm.

[0025] In some embodiments, the second surface includes a bonding area, and a third sub-segment extends into the bonding area, the third sub-segment being configured to bond a flexible circuit board within the bonding area.

[0026] In other embodiments, the multiple third-segment traces comprise multiple straight segments arranged side-by-side. A selected edge is formed where the second surface contacts the selected side surface; the two edges adjacent to the selected edge are the first edge and the second edge. Among the multiple connecting traces, the distance between the third-segment trace of the connecting trace closest to the first edge and the first edge is greater than or equal to 100 μm. Among the multiple connecting traces, the distance between the third-segment trace of the connecting trace closest to the second edge and the second edge is greater than or equal to 100 μm.

[0027] The display panel and driving circuit board are provided in any of the embodiments described above. The driving circuit board is disposed on the second surface of the back panel of the display panel, and the driving circuit board is electrically connected to a plurality of first electrodes of the display panel through a flexible circuit board and a plurality of connection traces of the display panel.

[0028] In another aspect, a splicing display device is provided, comprising: a plurality of display devices as provided in the other aspect above, wherein the plurality of display devices are spliced ​​together. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0030] Figure 1 A structural diagram of the display surface side of a display panel provided for some embodiments of this disclosure;

[0031] Figure 2 A structural diagram of the non-display side of a display panel provided for some embodiments of this disclosure;

[0032] Figure 3 A cross-sectional view of a display panel provided for some embodiments of this disclosure;

[0033] Figure 4 A cross-sectional view of another display panel provided for some embodiments of this disclosure;

[0034] Figure 5 A partial structural diagram of the non-display side of another display panel provided for some embodiments of this disclosure;

[0035] Figure 6 Structural diagrams of the third segment of the trace provided for some embodiments of this disclosure;

[0036] Figure 7 for Figure 6 Side view of the third segment of the cable in the AA direction;

[0037] Figure 8 for Figure 6 Side view of the third segment of the cable in the BB direction;

[0038] Figure 9 An orthographic projection of the side of a third segment of a trace on a backplate, provided for some embodiments of this disclosure;

[0039] Figure 10 An orthographic projection of the side of another third segment of the trace on a backplate, provided for some embodiments of this disclosure;

[0040] Figure 11 An orthographic projection of the side of the first connection portion of another third segment of the trace provided for some embodiments of this disclosure on the back plate;

[0041] Figure 12 An orthographic projection of the side of the second connection portion of another third segment of the trace provided for some embodiments of this disclosure on the back plate;

[0042] Figure 13 A structural diagram of the non-display side of another display panel provided for some embodiments of this disclosure;

[0043] Figure 14 for Figure 13 Enlarged view of the third trace on the non-display side of the central display panel;

[0044] Figure 15 Another structural diagram of the non-display side of a display panel provided for some embodiments of this disclosure;

[0045] Figure 16 for Figure 15 Enlarged view of the third trace on the non-display side of the central display panel;

[0046] Figure 17Partial structural diagrams of the non-display side of a display panel provided for some embodiments of this disclosure;

[0047] Figure 18 A structural diagram of the non-display side of a display panel provided for some embodiments of this disclosure;

[0048] Figure 19 Cross-sectional views of connection traces provided for some embodiments of this disclosure;

[0049] Figure 20A A cross-sectional view of a first protective layer and a second protective layer of a display panel provided for some embodiments of this disclosure;

[0050] Figure 20B Another cross-sectional view of the first and second protective layers of the display panel provided for some embodiments of this disclosure;

[0051] Figure 21A Structural diagram of the display side of a display device provided for some embodiments of this disclosure;

[0052] Figure 21B Structural diagrams of the non-display side of a display device provided for some embodiments of this disclosure;

[0053] Figure 22 This is a structural diagram of a splicing display device provided for some embodiments of the present disclosure. Detailed Implementation

[0054] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0055] Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms, such as the third-person singular "comprises" and the present participle "comprising," are interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0056] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0057] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0058] "At least one of A, B and C" has the same meaning as "at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.

[0059] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0060] As used herein, depending on the context, the term “if” may optionally be interpreted as meaning “when”, “in the event of”, “in response to determination”, or “in response to detection”. Similarly, depending on the context, the phrase “if it is determined that…” or “if [the stated condition or event] is detected” may optionally be interpreted as meaning “in the event of determination that…”, “in response to determination that…”, “when [the stated condition or event] is detected”, or “in response to the detection of [the stated condition or event]”.

[0061] The use of “applies to” or “configured to” in this article implies an open and inclusive language that does not preclude applicability to or configuration to devices that perform additional tasks or steps.

[0062] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0063] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched regions shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0064] like Figure 1 and Figure 2 As shown, a structural diagram of a display device 1000 is provided, wherein, Figure 1 This is a structural view of the front of the display device 1000. Figure 2 This is a structural diagram of the rear side of the display device 1000. The display device 1000 includes a display panel 100 and a driver circuit board 200. The driver circuit board 200 is configured to drive the display panel 100 to display via a driver integrated circuit (IC). The driver circuit board 200 includes, for example, a gate drive circuit, a source drive circuit, a timing controller, and a power supply circuit. The driver circuit board 200 is electrically connected to the display panel 100 and is configured to output corresponding signals to control the display panel 100 to display.

[0065] like Figure 1 and Figure 17As shown, the display panel 100 includes a display area AA and a peripheral area BB disposed on at least one side of the display area. For example, the peripheral area BB can be located on one, two, or three sides of the display area AA, or the peripheral area BB can be disposed around the display area AA. The display area AA has an array of pixels P and multiple signal lines 90, which are electrically connected to the pixels P. Each pixel P includes at least one light-emitting device 20, which can be, for example, an inorganic light-emitting diode (LED) with a size of less than 500 micrometers or less than 100 micrometers.

[0066] like Figure 3 As shown, Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the display device 1000. The display panel 100 includes a back plate 10, a plurality of light-emitting devices 20, a plurality of first electrodes 30, a plurality of connecting traces 40, and a plurality of second electrodes 50. The back plate 10 includes a first surface 10a, a second surface 10b opposite to the first surface 10a, and a plurality of side surfaces 10c connecting the first surface 10a and the second surface 10b, at least one of the side surfaces being a selected side surface 10cc. The back plate 10 may be a glass substrate. Each of the plurality of connecting traces 40 includes a first segment trace 40a, a second segment trace 40b, and a third segment trace 40c connected sequentially. The first segment trace 40a is disposed on the first surface 10a, the second segment trace 40b is disposed on the selected side surface 10cc, and the third segment trace 40c is disposed on the second surface 10b. The plurality of first electrodes 30 are disposed on the first surface 10a and close to the selected side surface 10cc. The first electrodes 30 are configured to be electrically connected to the light-emitting devices 20 and the first segment trace 40a. Multiple second electrodes 50 are disposed on the second surface 10b, near a selected side 10cc. Exemplarily, the positions of the multiple first electrodes 30 and the multiple second electrodes 50 correspond to each other. The second electrodes 50 are configured to be electrically connected to the third trace 40c and the flexible printed circuit board (FPC) / driving circuit board 200. That is, the connecting trace 40 connects the first electrodes 30 and the second electrodes 50, thereby achieving a connection between the first surface 10a and the second surface 10b of the backplane 10.

[0067] like Figure 2 and Figure 3 As shown, the driving circuit board 200 is bonded to the non-display side of the display panel 100, that is, the driving circuit board 200 is bonded to the second surface 10b of the back plate 10. The light-emitting device 20 located on the display side of the display panel 100 (the first surface 10a of the back plate 10) is electrically connected to the driving circuit board 200 via connecting traces 40. In this way, the bezel of the display device 1000 can be reduced, and the screen-to-body ratio of the display device can be increased.

[0068] In some examples, the light-emitting device 20 is a Mini LED (mini light-emitting diode) or a Micro LED (micro light-emitting diode). Due to limitations in current manufacturing capabilities and cost factors, large-size display panels cannot be directly manufactured. The current solution is to use multiple small-size display panels spliced ​​together to achieve a larger size. For example... Figure 3 As shown, the driving circuit board 200 of the display device 1000 is bonded to the second surface 10b of the back panel 10. The light-emitting device 20 located on the first surface 10a of the back panel 10 and the driving circuit board 200 located on the second surface 10b are electrically connected through a first trace 40a, a second trace 40b, and a third trace 40c. This reduces the bezel width of the display device 1000, increases the screen-to-body ratio, and facilitates a seamless splicing effect.

[0069] In some embodiments, the first electrode 30 on the first surface 10a of the backplate 10 and the second electrode 50 on the second surface 10b of the backplate 10 are prepared by processes such as electroplating, vapor deposition, pad printing with silver paste, or wet etching. During this preparation process, after completing the fabrication of each film layer on the first surface 10a of the backplate 10, the backplate 10 needs to be flipped over before the corresponding film layer structure is fabricated on the second surface 10b. In actual production, the backplate 10 needs to be flipped over during processing, inevitably causing the first surface 10a to come into contact with the equipment base, and scratches or dirt on the first surface 10a are difficult to avoid. Scratches or dirt can lead to short circuits, affecting product yield and quality.

[0070] Based on this, some embodiments of the present disclosure provide a display panel, a display device, and a splicing display device. The display panel is manufactured using a single-sided process, removing the second electrode. It is electrically connected to a flexible circuit board through a third trace disposed on the second surface. During the processing, there is no need to flip the back panel, preventing scratches and dirt from the back panel contacting the equipment, thereby improving product yield and quality.

[0071] The following sections will describe the display panel, display device, and splicing display device provided in this disclosure.

[0072] In this disclosure, such as Figure 4 As shown, the display panel 100 includes: a backplate 10, multiple light-emitting devices 20, multiple first electrodes 30, and multiple connecting lines 40. The arrangement and connection relationship of the multiple light-emitting devices 20, multiple first electrodes 30, and multiple connecting lines 40 are described above and will not be repeated here.

[0073] Among them, such as Figure 5As shown, the third segment 40c includes a first sub-segment 40ca, a second sub-segment 40cb, and a third sub-segment 40cc connected sequentially. The first sub-segment 40ca is located 10cc closer to the selected side. The first sub-segments 40ca of multiple connecting traces 40 are arranged in parallel, and the third sub-segments 40cc of multiple connecting traces 40 are also arranged in parallel. Figure 6 As shown, the extension direction of the first sub-segment 40ca intersects the extension direction of the second sub-segment 40cb, and the extension direction of the second sub-segment 40cb intersects the extension direction of the third sub-segment 40cc. The angle α formed between the extension directions of the first sub-segment 40ca and the second sub-segment 40cb ranges from 90° to 180°, and the angle β formed between the extension directions of the third sub-segment 40cc and the second sub-segment 40cb ranges from 90° to 180°.

[0074] In some examples, such as Figure 5 and Figure 6 As shown, the first sub-segment 40ca, the second sub-segment 40cb, and the third sub-segment 40cc are all straight line segments. The first sub-segment 40ca and the third sub-segment 40cc are parallel, and the two ends of the second sub-segment 40cb are connected to the first sub-segment 40ca and the third sub-segment 40cc, respectively. When the first sub-segment 40ca and the third sub-segment 40cc are parallel but not on the same straight line, the angle α formed between the extension direction of the first sub-segment 40ca and the extension direction of the second sub-segment 40cb satisfies: 90° < α < 180°; the angle β formed between the extension direction of the third sub-segment 40cc and the extension direction of the second sub-segment 40cb satisfies: 90° < β < 180°.

[0075] In other examples, the angle ranges of α and β are designed to be 100° to 180°, with the minimum values ​​of α and β close to 100°. The larger the angle α formed between the extension directions of the first sub-segment 40ca and the second sub-segment 40cb, the smaller the deflection angle (supplementary angle α) of the second sub-segment 40cb relative to the first sub-segment 40ca. Similarly, the larger the angle β formed between the extension directions of the third sub-segment 40cc and the second sub-segment 40cb, the smaller the deflection angle (supplementary angle β) of the third sub-segment 40cc relative to the second sub-segment 40cb. This is achieved when using laser technology... During the preparation of the third segment of the trace, by controlling the laser beam to move at a constant speed during processing, it is possible to avoid the laser staying in one place for too long and accumulating excessive energy radiation, thereby avoiding damage to non-target film layers (such as the conductive film layer on the first surface of the back panel). The laser beam needs to pause at the intersection of two sub-segments to deflect its travel direction. The smaller the travel deflection angle of the laser beam (i.e., the deflection angle of adjacent sub-segments), the shorter the pause time, and the less damage to non-target film layers. Setting the angle range of α and the angle range of β can reduce the damage of the laser to non-target film layers and improve the yield of the display panel.

[0076] By directly connecting the portion of the connecting trace 40 located on the second surface 10b of the display panel 100 to the flexible circuit board 80, that is, by first preparing the various layers of the display panel 100 located on the first surface 10a, and then preparing the connecting trace 40 through a side process, since the connecting trace 40 extends to the second surface 10b of the backplate 10, damage to the various layers of the first surface 10a can be avoided when preparing the film layer on the second surface 10b.

[0077] On the one hand, it simplifies the production process. For example, it can reduce the number of patterning processes and the number of photomasks required. It can also eliminate the step and materials of peeling off the protective layer to prevent scratches and abrasions, thereby reducing the product manufacturing cost and enhancing the product's competitiveness.

[0078] On the other hand, the reduced number of times the backplate 10 contacts the equipment base reduces the likelihood of the display panel 100 failing to function properly due to signal line breakage, thus improving product yield. In the long run, the backplate 10 reduces contamination caused by repeated contact with the equipment base, which can lead to corrosion of components or circuits and extend the lifespan of the display panel 100.

[0079] In some embodiments, such as Figure 5As shown, multiple third-segment traces 40c are electrically connected to at least one flexible circuit board 80. At least two third-segment traces 40c connected to the same flexible circuit board 80 are symmetrically arranged about a symmetry line S perpendicular to a selected side 10cc. The at least two third-segment traces 40c connected to the same flexible circuit board 80 are referred to as a group, and a group of third-segment traces 40c corresponds to one symmetry line S. For example, based on the orientation of the extension direction of the second sub-segment 40cb in the third-segment trace 40c, the multiple third-segment traces 40c tend to converge towards the symmetry line S, forming a convergence trend from the first segment trace 40ca to the third segment trace 40cc.

[0080] In some embodiments, such as Figure 6 As shown, Figure 6 This is a structural diagram of a third segment trace 40c. The connecting trace 40 also includes a first connecting part 40d, and the first sub-segment 40ca and the second sub-segment 40cb are connected through the first connecting part 40d. Wherein, as... Figure 7 , Figure 8 and Figure 9 As shown, Figure 7 for Figure 6 The structural diagram of the third segment of the middle route 40c obtained from the AA direction. Figure 8 for Figure 6 The structural diagram of the third segment of the middle route, 40c, obtained from the BB direction. Figure 9 The first connecting portion 40d includes opposing first inner side d1 and first outer side d2. In a first connecting portion 40d, the first inner side d1 is closer to the first outer side d2, and the symmetry line S associated with this first connecting portion 40d is defined. The orthographic projection of the first inner side d1 onto the back plate 10 is the first inner edge d1', and the orthographic projection of the first outer side d2 onto the back plate is the first outer edge d2'.

[0081] like Figure 7 , Figure 8 and Figure 9As shown, the first sub-segment 40ca includes an inner surface ca1 and an outer surface ca2 of the first sub-segment. In a first sub-segment 40ca, the inner surface ca1 is closer to the outer surface ca2 of the first sub-segment, and the symmetry line S associated with this first sub-segment 40ca (the symmetry line S corresponding to the group of third segments 40c in which this first sub-segment 40ca is located) is also included. The orthographic projection of the inner surface ca1 of the first sub-segment onto the backplate 10 is the inner side ca1' of the first sub-segment, and the orthographic projection of the outer surface ca2 of the first sub-segment onto the backplate 10 is the outer side ca2' of the first sub-segment. The second sub-segment 40cb includes a relatively inner side cb1 and an outer side cb2. In a second sub-segment 40cb, the inner side cb1 is closer to the outer side cb2. The symmetry line S associated with this second sub-segment 40cb (the symmetry line S corresponding to the group of third segments 40c in which this second sub-segment 40cb is located) is also included. The orthographic projection of the inner side cb1 of the second sub-segment onto the backplate 10 is the inner side cb1' of the second sub-segment, and the orthographic projection of the outer side cb2 of the second sub-segment onto the backplate 10 is the outer side cb2' of the second sub-segment. Wherein, as... Figure 9 As shown, the first inner edge d1' is connected to the inner side edge ca1' of the first sub-segment and the inner side edge cb1' of the second sub-segment, and the first outer edge d2' is connected to the outer side edge ca2' of the first sub-segment and the outer side edge cb2' of the second sub-segment.

[0082] In some examples, such as Figure 6 As shown, in the connecting trace 40, the angle α formed between the extension direction of the first sub-segment 40ca and the extension direction of the second sub-segment 40cb ranges from 100° to 180°, that is, angle α satisfies: 100° < α < 180°. For example, angle α can be 100°, 150°, or 170°. The first sub-segment 40ca and the second sub-segment 40cb are connected by a first connecting part 40d. The first connecting part 40d, the first sub-segment 40ca, and the second sub-segment 40cb all belong to the connecting trace 40. The first sub-segment 40ca, the first connecting part 40d, and the second sub-segment 40cb are sequentially connected and integrally formed.

[0083] In some embodiments, such as Figure 9 and Figure 10 As shown, the first inner edge d1' is a curve; and / or, the first outer edge d2' is a curve.

[0084] In some examples, such as Figure 9As shown, the first inner edge d1' is an arc; and / or, the first outer edge d2' is an arc, for example, both the opposing first inner edge d1' and the first outer edge d2' are arcs. Specifically, the first inner edge d1' is tangent to the inner side ca1' of the first sub-segment and is tangent to the inner side ca1' of the second sub-segment. The first outer edge d2' is tangent to the outer side ca2' of the first sub-segment and is connected to the outer side ca2' of the second sub-segment.

[0085] In other examples, such as Figure 10 As shown, the first inner edge d1' is an S-shaped curve; and / or, the first outer edge d2' is an S-shaped curve. For example, both the opposing first inner edge d1' and the first outer edge d2' are S-shaped curves. The first inner edge d1' is smoothly connected to the inner edge ca1' of the first sub-segment, and the first inner edge d1' is smoothly connected to the inner edge cb1' of the second sub-segment. The first outer edge d2' is smoothly connected to the outer edge ca2' of the first sub-segment, and the first outer edge d2' is smoothly connected to the outer edge cb2' of the second sub-segment.

[0086] For example, a metal coating is prepared on the first surface, selected side surface, and second surface 10b of a backplane. The metal coating is then patterned using laser etching to obtain multiple interconnect traces. During the laser etching process, it is crucial to ensure that no damage is caused to non-target layers throughout the process. For instance, during the formation of the third segment of the interconnect trace, if the laser etches the metal coating on the second surface 10b of the backplane, the laser energy might penetrate the backplane and damage the film on the first surface, causing problems such as circuit breakage. Whether non-target layers are damaged is directly related to the absorption of laser light by the material of the non-target layers, the laser energy, and the residence time of the laser on the metal coating.

[0087] By controlling the laser beam to move at a constant speed during processing, it is possible to avoid the laser lingering in one spot for too long and thus preventing damage to non-target film layers. Specifically, during the formation of the first sub-segment 40ca and the second sub-segment 40cb, the laser beam can be controlled to travel at a constant speed along a path parallel to the extension direction of the first sub-segment 40ca. However, the first sub-segment 40ca has an angle of 100° to 180° relative to the second sub-segment 40cb, meaning the laser beam's direction of travel will deflect. The laser needs to pause at the intersection of the two segments to adjust its direction of travel. Therefore, to ensure the laser travels at a constant speed throughout the entire process, at the end of the first sub-segment 40ca closest to the second sub-segment 40cb, the laser beam needs to be controlled to travel along a smooth curved path, gradually changing to a direction of travel parallel to the extension direction of the second sub-segment 40cb.

[0088] In some embodiments, such as Figure 11 As shown, the first inner edge d1' comprises multiple line segments connected end-to-end. The angle θ1 formed between one of these line segments and the inner edge ca1' of the first sub-segment is between 170° and 177°. The angle θ2 formed between two connected line segments of the first inner edge d1' is also between 170° and 177°. The angle θ3 formed between one of these line segments and the inner edge cb1' of the second sub-segment is also between 170° and 177°.

[0089] In some examples, the angle θ1 formed between a segment of the multiple segments of the first inner edge d1' that connects to the inner edge ca1' of the first sub-segment and the inner edge ca1' of the first sub-segment can be 170°, 175°, or 177°. The angle θ2 formed between two connected segments of the multiple segments of the first inner edge d1' can also be 170°, 175°, or 177°. The angle θ3 formed between a segment of the multiple segments of the first inner edge d1' that connects to the inner edge cb1' of the second sub-segment and the inner edge cb1' of the second sub-segment can also be 170°, 175°, or 177°. Taking angles θ1, θ2, and θ3 as all being 170° and angle α formed between the inner side ca1' of the first sub-segment and the inner side cb1' of the second sub-segment as being 150° as an example, that is, the inner side cb1' of the second sub-segment is deflected by 40° relative to the inner side ca1' of the first sub-segment. The multiple broken line segments of the first inner side d1' undergo multiple deflections, each with a deflection angle of 10°. The first inner side d1' becomes a relatively smooth transition part between the inner side ca1' of the first sub-segment and the inner side cb1' of the second sub-segment. Correspondingly, the first inner surface d1 becomes a relatively smooth transition part between the inner surface ca1 of the first sub-segment and the inner surface cb1 of the second sub-segment.

[0090] In other embodiments, such as Figure 11 As shown, the first outer edge d2' comprises multiple line segments connected end-to-end. The angle Ф1 formed between one of these line segments and the outer edge ca2' of the first sub-segment, denoted by Ф1, ranges from 170° to 177°. The angle Ф2 formed between two connected line segments of the first outer edge d2' also ranges from 170° to 177°. Similarly, the angle Ф3 formed between one of these line segments and the outer edge cb2' of the second sub-segment, denoted by Ф3, also ranges from 170° to 177°.

[0091] In some examples, the angle Ф1 formed between a segment of the multiple segments of the first outer edge d2' that connects to the outer edge ca2' of the first sub-segment and the outer edge ca2' of the first sub-segment can be 170°, 175°, or 177°. The angle Ф2 formed between two connected segments of the multiple segments of the first outer edge d2' can also be 170°, 175°, or 177°. The angle Ф3 formed between a segment of the multiple segments of the first outer edge d2' that connects to the outer edge cb2' of the second sub-segment and the outer edge cb2' of the second sub-segment can also be 170°, 175°, or 177°. Taking angles Ф1, Ф2, and Ф3 as all being 170°, and angle α formed between the outer edge ca2' of the first sub-segment and the outer edge cb2' of the second sub-segment as being 150°, this means that the outer edge cb2' of the second sub-segment is deflected by 40° relative to the outer edge ca2' of the first sub-segment. The multiple broken lines of the first outer edge d2' undergo multiple deflections, each with an angle of 10°. The first outer edge d2' becomes a relatively smooth transition between the outer edges ca2' and cb2' of the first and second sub-segments. Correspondingly, the first outer surface d2 becomes a relatively smooth transition between the outer surface ca2 and cb2 of the first and second sub-segments.

[0092] Referring to the example above, the first connecting portion 40d connects the first sub-segment 40ca and the second sub-segment 40cb. The first inner edge d1' of the first connecting portion 40d undergoes multiple deflections of 3° to 10° through multiple broken line segments, achieving a deflection of 0 to 80° between the inner edge ca1' of the first sub-segment and the inner edge cb1' of the second sub-segment. The first inner surface d1 becomes a relatively smooth transition portion between the inner surfaces ca1 and cb1 of the first and second sub-segments.

[0093] The first outer edge d2' of the first connecting part 40d undergoes multiple deflections of 3° to 10° through multiple broken line segments, achieving a deflection angle between the outer edge ca2' of the first sub-segment and the outer edge cb2' of the second sub-segment that is the supplementary angle of angle α. The supplementary angle α ranges from 0 to 80°, meaning that the direction of travel of the laser beam will be deflected from 0 to 80°. The first outer surface d2 becomes a relatively smooth transition part between the outer surface ca2 of the first sub-segment and the outer surface cb2 of the second sub-segment.

[0094] With the first inner surface d1 and the first outer surface d2 forming a relatively smooth transition portion, the first connecting portion 40d becomes the transition portion between the first sub-segment 40ca and the second sub-segment 40cb. A relatively smooth transition connection is achieved by satisfying the deflection of 100° to 180° between the first sub-segment 40ca and the second sub-segment 40cb.

[0095] In actual processing, it may be impossible to control the laser's path to be a perfect arc or a smooth curve. When the first inner edge d1' and the first outer edge d2' use multiple broken lines, and the angle between adjacent broken lines is extremely small, the laser's path is a series of broken lines consistent with the path of the first inner edge d1' or the first outer edge d2'. Furthermore, at the corner positions of adjacent broken lines, due to the extremely low deflection angle (e.g., 3° ​​to 10°), the laser requires only a short pause due to adjustment of its travel direction, thus causing no damage to non-target film layers or causing damage within an acceptable range.

[0096] In some embodiments, such as Figure 6 As shown, the connecting trace 40 also includes a second connecting part 40e, and the third sub-segment 40cc and the second sub-segment 40cb are connected through the second connecting part 40e. Wherein, as... Figure 7 , Figure 8 and Figure 9 As shown, the second connecting portion 40e includes a second inner surface e1 and a second outer surface e2. In one second connecting portion 40e, the second inner surface e1 is closer to the second outer surface e2. The symmetry line S associated with this second connecting portion 40e (the symmetry line S corresponding to the group of third segment traces 40c in which this second connecting portion 40e is located) is also present. The orthographic projection of the second inner surface e1 on the back plate 10 is the second inner edge e1', and the orthographic projection of the second outer surface e2 on the back plate 10 is the second outer edge e2'. The third sub-segment 40cc includes a third sub-segment inner surface cc1 and a third sub-segment outer surface cc2. In one third sub-segment 40cc, the third sub-segment inner surface cc1 is closer to the third sub-segment outer surface cc2. The symmetry line S associated with this third sub-segment 40cc (the symmetry line S corresponding to the group of third segment traces 40c in which this third sub-segment 40cc is located) is also present. The orthographic projection of the inner side cc1 of the third sub-segment onto the back plate 10 is the inner side cc1' of the third sub-segment, and the orthographic projection of the outer side cc2 of the third sub-segment onto the back plate 10 is the outer side cc2' of the third sub-segment. For example... Figure 9 As shown, the second inner edge e1' is connected to the inner side edge cc1' of the third sub-segment and the inner side edge cc2' of the second sub-segment, and the second outer edge e2' is connected to the outer side edge cc2' of the third sub-segment and the outer side edge cb2' of the second sub-segment.

[0097] In some examples, the angle β formed between the extension direction of the third sub-segment 40cc and the extension direction of the second sub-segment 40cb satisfies: 100° < β < 180°, for example, angle β can be 100°, 150°, or 170°. Taking an angle β of 150° between the extension directions of the third sub-segment 40cc and the second sub-segment 40cb as an example, the third sub-segment 40cc and the second sub-segment 40cb are connected by a second connecting part 40e. This second connecting part 40e, the third sub-segment 40cc, and the second sub-segment 40cb are all connecting traces 40, and the third sub-segment 40cc, the second connecting part 40e, and the second sub-segment 40cb are sequentially connected and integrally formed.

[0098] In some embodiments, such as Figure 9 and Figure 10 As shown, the second inner edge e1' is a curve; and / or, the second outer edge e2' is a curve.

[0099] In some examples, such as Figure 9 As shown, the second inner edge e1' is an arc; and / or, the second outer edge e2' is an arc. Specifically, the second inner edge e1' is tangent to the inner edge cc1' of the third sub-segment and tangent to the inner edge connection cb1' of the second sub-segment. The second outer edge e2' is tangent to the outer edge cc2' of the third sub-segment and connected to the outer edge cb2' of the second sub-segment.

[0100] In other examples, such as Figure 10 As shown, the second inner edge e1' is an S-shaped curve; and / or, the second outer edge e2' is an S-shaped curve. Specifically, the second inner edge e1' is smoothly connected to the inner edge cc1' of the third sub-segment, and the second inner edge e1' is smoothly connected to the inner edge cb1' of the second sub-segment. The second outer edge e2' is smoothly connected to the outer edge cc2' of the third sub-segment, and the second outer edge e2' is smoothly connected to the outer edge cb2' of the second sub-segment.

[0101] The second inner edge e1' and the second outer edge e2' of the second connecting part 40e are arcs or smooth curves. In the laser etching process, the laser moves at a constant speed during the processing of the second connecting part 40e, which can avoid the laser staying in one place for too long and avoid damage to non-target film layers. Specifically, during the formation of the second sub-segment 40cb and the third sub-segment 40cc, the laser beam can be controlled to travel at a constant speed along a path parallel to the extension direction of the second sub-segment 40cb for etching. However, the deflection angle of the third sub-segment 40cc relative to the second sub-segment 40cb is the supplementary angle of angle β, which ranges from 0 to 80°. This means that the direction of travel of the laser beam will deflect from 0 to 80°, and the laser needs to pause at the intersection of the two to adjust its direction of travel. Therefore, in order to ensure that the laser travels at a constant speed throughout the entire movement, at the end of the second sub-segment 40cb closest to the third sub-segment 40cc, the laser beam needs to be controlled to travel along a smooth curved path, thereby gradually changing to a direction of travel parallel to the extension direction of the third sub-segment 40cc.

[0102] In some embodiments, such as Figure 12 As shown, the second inner edge e1' comprises multiple line segments connected end-to-end. The angle δ1 formed between one of these line segments, which connects to the inner edge cc1' of the third sub-segment, and the inner edge cc1' of the third sub-segment ranges from 170° to 177°. The angle δ2 formed between two connected line segments of the second inner edge e1' ranges from 170° to 177°. The angle δ3 formed between one of these line segments, which connects to the inner edge cb1' of the second sub-segment, and the inner edge cb1' of the second sub-segment, ranges from 170° to 177°.

[0103] In some examples, the angle δ1 formed between a segment of the second inner edge e1' that connects to the inner edge cc1' of the third sub-segment and the inner edge cc1' of the third sub-segment can be 170°, 175°, or 177°. The angle δ2 formed between two connected segments of the second inner edge e2' can be 170°, 175°, or 177°. The angle δ3 formed between a segment of the second inner edge d1' that connects to the inner edge cb1' of the second sub-segment and two connected segments of the first inner edge d1' can be 170°, 175°, or 177°. Taking angles δ1, δ2, and δ3 as all being 170° and angle β formed between the inner side cc1' of the third sub-segment and the inner side cb1' of the second sub-segment as being 150° as an example, that is, the inner side cc1' of the third sub-segment is deflected by 40° relative to the inner side cb1' of the second sub-segment. The multiple broken line segments of the first inner side d1' undergo multiple deflections, each with a deflection angle of 10°. The second inner side e1' becomes a relatively smooth transition part between the inner side cc1' of the third sub-segment and the inner side cb1' of the second sub-segment. Correspondingly, the second inner surface e1 becomes a relatively smooth transition part between the inner side cc1 of the third sub-segment and the inner surface cb1 of the second sub-segment.

[0104] In other embodiments, such as Figure 12 As shown, the second outer edge e2' comprises multiple line segments connected end-to-end. The angle γ1 formed between one of these line segments, which connects to the outer edge cc2' of the third sub-segment, and cc2' ranges from 170° to 177°. The angle γ2 formed between two connected line segments of the second outer edge e2' also ranges from 170° to 177°. The angle γ3 formed between one of these line segments, which connects to the outer edge cb2' of the second sub-segment, also ranges from 170° to 177°.

[0105] In some examples, the angle γ1 formed between a segment of the multiple segments of the second outer edge e2' that connects to the outer edge cc2' of the third sub-segment and the outer edge cc2' of the third sub-segment can be 170°, 175°, or 177°. The angle γ2 formed between two connected segments of the multiple segments of the second outer edge e2' can also be 170°, 175°, or 177°. The angle γ3 formed between a segment of the multiple segments of the second outer edge e2' that connects to the outer edge cb2' of the second sub-segment and the outer edge cb2' of the second sub-segment can also be 170°, 175°, or 177°. Taking angles γ1, γ2, and γ3 as all being 170° and angle β formed between the outer edge cc2' of the third sub-segment and the outer edge cb2' of the second sub-segment as being 150° as an example, that is, the outer edge cc2' of the third sub-segment is deflected by 40° relative to the outer edge cb2' of the second sub-segment. The multiple broken line segments of the second outer edge e2' undergo multiple deflections, each with an angle of 10°. The second outer edge e2' becomes a relatively smooth transition part between the outer edge cc2' of the third sub-segment and the outer edge cb2' of the second sub-segment. Correspondingly, the first outer surface d2 becomes a relatively smooth transition part between the outer edge cc2 of the third sub-segment and the outer surface cb2 of the second sub-segment.

[0106] Referring to the example above, the second connecting portion 40e connects the third sub-segment 40cc and the second sub-segment 40cb. The second inner edge e1' of the second connecting portion 40e undergoes multiple deflections of 3° to 10° through multiple broken line segments, achieving a deflection of 100° to 180° between the inner edge cc1' of the third sub-segment and the inner edge cb1' of the second sub-segment. The second inner surface e1 becomes a relatively smooth transition between the inner surface cc1 of the third sub-segment and the inner surface cb1 of the second sub-segment.

[0107] The second outer edge e2' of the second connecting part 40e undergoes multiple deflections of 3° to 10° through multiple broken line segments, achieving a deflection of 100° to 180° between the outer edge cc2' of the third sub-segment and the outer edge cb2' of the second sub-segment. The second outer surface e2 becomes a relatively smooth transition part between the inner surface cc2 of the third sub-segment and the outer surface cb2 of the second sub-segment.

[0108] With the second inner side e1 and the second outer side e2 forming a relatively smooth transition portion, the second connecting portion 40e becomes the transition portion between the third sub-segment 40cc and the second sub-segment 40cb. Based on satisfying the deflection of 100° to 180° between the third sub-segment 40ca and the second sub-segment 40cb, a smooth transition connection is achieved.

[0109] The first inner edge d1' and the first outer edge d2' of the second connecting part 40e adopt multiple broken lines with very small angles between adjacent broken lines. The forward path of the laser is multiple broken lines that are consistent with the path of the second inner edge e1' or the second outer edge e2'. At the corner position of the laser at the adjacent broken line, because the angle is very low, for example, the angle is 3° to 10°, the laser needs to pause for a short time due to the adjustment of the travel direction, so it will not cause damage to non-target film layers or the damage is within an acceptable range.

[0110] like Figure 13 , Figure 14 , Figure 15 and Figure 16 It can be seen that the second surface 10b forms an edge Ae at the junction with each of the plurality of side surfaces 10c. There are multiple edges Ae, with one edge Ae provided at each edge of the second surface 10b. The second surface 10b forms a selected edge Ae' at the junction with a selected side surface 10cc; the two edges Ae adjacent to the selected edge Ae' are the first edge Ae1 and the second edge Ae2.

[0111] In some embodiments, such as Figure 13 As shown, the second surface 10b includes a bonding area CC, and a third sub-segment 40cc extends into the bonding area CC. The third sub-segment 40cc is configured to bond the flexible circuit board 80 or a driver circuit board within the bonding area CC. Specifically, the third sub-segment 40cc can correspond one-to-one with and be connected to the gold finger structure of the flexible circuit board 80. The length of the third sub-segment 40cc in its extending direction is greater than the length of the gold finger, for example, the length of the third sub-segment 40cc in its extending direction is 1.1-1.5 times the length of the gold finger, for example, about 1.3 times. Figure 14 and Figure 15 As shown, among the multiple connecting traces 40, the distance L1 between the outer edge cc2' of the third sub-trace of the connecting trace 40 closest to the first edge Ae1 and the first edge Ae1 is greater than or equal to 100μm. Similarly, the distance L2 between the outer edge cc2' of the third sub-trace of the connecting trace 40 closest to the second edge Ae2 and the second edge Ae2 is greater than or equal to 100μm. The spacing between the binding area CC and the selected edge Ae' is greater than or equal to 500μm and less than or equal to 10mm; for example, it can be 680μm, 700μm, or 9mm.

[0112] Considering the current technological level and equipment precision, for example, the flexible circuit board 80 itself has dimensional errors, such as ±100μm. Misalignment may occur when bonding the flexible circuit board to multiple third-segment traces. Alternatively, in the bonding process, anisotropic conductive film (ACF) is typically used to connect multiple third-segment traces to the flexible circuit board 80. During the bonding process, the position of the anisotropic conductive film has an error of ±150μm. If the distances L1 and L2 are too small, it may not meet the technological and equipment precision requirements, leading to bonding misalignment and positional errors of various components. In the direct bonding process between the third sub-segment 40cc and the flexible circuit board 80, distances L1 and L2 are greater than or equal to 100μm, which meets the current technological requirements and equipment capabilities.

[0113] For example, on the second surface 10b, the distance L1 between the outer edge cc2' of the third sub-trace of the connection trace 40 closest to the first edge Ae1 and the first edge Ae1 can be 100μm, 110μm, and 120μm. The distance L2 between the outer edge cc2' of the third sub-trace of the connection trace 40 closest to the second edge Ae2 and the second edge Ae2 can be 100μm, 110μm, and 120μm. The distance L3 between the outer edge cc2' of the first sub-trace of the connection trace 40 closest to the first edge Ae1 and the first edge Ae1 can be less than 100μm. The distance L4 between the outer edge cc2' of the first sub-trace of the connection trace 40 closest to the second edge Ae2 and the second edge Ae2 can be less than 100μm.

[0114] In some embodiments, such as Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, multiple connecting traces 40 are divided into at least one connecting trace group G, and each connecting trace group G includes at least two connecting traces 40. In each connecting trace group G, the extension direction of the first sub-segment 40ca is the same as the extension direction of the third sub-segment 40cc, and the distance L8 between the outer edges cc2' of the third sub-segment 40cc of the two farthest connecting traces 40 is less than the distance L9 between the outer edges ca2' of the first sub-segment 40ca of the two farthest connecting traces 40.

[0115] In some examples, such as Figure 13 and Figure 14As shown, the multiple connecting traces 40 on the backplane 10 form a connecting trace group G. The distance L8 between the outer edges cc2' of the two outermost third sub-segments of this connecting trace group G is smaller than the distance L9 between the outer edges ca2' of the two outermost first sub-segments. One connecting trace group G is electrically connected to a flexible circuit board 80. That is, in each connecting trace group G, the multiple third sub-segments are converged relative to the multiple first sub-segments, and the total size of the multiple third sub-segments is reduced in the direction perpendicular to the extension direction of the third sub-segments.

[0116] In other examples, such as Figure 15 and Figure 16 As shown, the multiple connecting traces 40 on the backplane 10 are divided into two connecting trace groups G. The distance L8 between the outer edges cc2' of the two outermost third sub-segments in each connecting trace group G is smaller than the distance L9 between the outer edges ca2' of the two outermost first sub-segments. Each connecting trace group G is electrically connected to a flexible circuit board 80. That is, in each connecting trace group G, the multiple third sub-segments are converged relative to the multiple first sub-segments, and the total size of the multiple third sub-segments is reduced in the direction perpendicular to the extension direction of the third sub-segments.

[0117] By using two connection trace groups G, two flexible circuit boards 80 can be used. That is, the size of each flexible circuit board 80 can be reduced, which facilitates the bonding of the flexible circuit board 80 with the connection trace group G and the insertion with the drive circuit board.

[0118] In some embodiments, such as Figure 15 and Figure 16 As shown, in two adjacent connecting trace groups G, the distance L5 between the outer edges cc2' of the third sub-segment of the two closest connecting traces is greater than 1000μm, for example, it can be 1010μm, 1100μm, or 1200μm.

[0119] In two adjacent wiring groups, an alignment mark is placed at the position between the outer edges cc2' of the third sub-segment of the two closest wirings. These two alignment marks are used for alignment during the bonding of the flexible circuit board 80. A distance L5 greater than 1000μm can meet the processing accuracy requirements and equipment capability requirements. Furthermore, controlling the minimum value of the distance L5 can also avoid the problem of stacking due to the large outer contours of adjacent flexible circuit boards 80. For example, the two alignment marks at the position between the outer edges cc2' of the third sub-segment of the two closest wirings in two adjacent wiring groups should be of different shapes and sizes, such as a cross alignment mark and a circular alignment mark, or a single alignment mark can be shared at the midpoint between the outer edges cc2' of the third sub-segment of the two closest wirings.

[0120] In some embodiments, such as Figure 14 and Figure 16 As shown, in the same connection routing group G, the distance between the outer edge cc2' of the third sub-segment of one connection routing 40 and the inner edge cc1' of the third sub-segment of the other connection routing 40 is the distance L7 between the two adjacent third sub-segments 40cc; the distance between the outer edge ca2' of the first sub-segment of one connection routing 40 and the inner edge ca1' of the first sub-segment of the other connection routing 40 is the distance L6 between the two adjacent first sub-segments 40ca. The distance L7 between the two adjacent third sub-segments 40cc is less than the distance L6 between the two adjacent first sub-segments 40ca.

[0121] In some examples, in two adjacent connecting traces of the same connecting trace group G, the distance between the outer edge ca2' of the first sub-segment of one connecting trace 40 and the inner edge ca1' of the first sub-segment of another connecting trace 40 can be 10μm to 60μm, for example, 10μm, 40μm, or 60μm. The distance between the outer edge cc2' of the third sub-segment of one connecting trace 40 and the inner edge cc1' of the third sub-segment of another connecting trace 40 is greater than or equal to 10μm, for example, 10μm, 30μm, or 50μm.

[0122] In each connecting trace group G, the distance L8 is less than the distance L9, and the distance L7 is less than the distance L6. The connecting trace group G is recessed inward at the position of the third sub-trace 40cc relative to the position of the first trace group 40ca. This design provides sufficient space for distances L1 and L2 to be greater than or equal to 100μm, which facilitates the bonding of flexible circuit boards.

[0123] In some embodiments, such as Figure 6 As shown, the dimension Wca of the first sub-segment 40ca in the direction perpendicular to its extension direction is greater than or equal to 60 μm. The dimension Wcc of the third sub-segment 40cc in the direction perpendicular to its extension direction is greater than or equal to 60 μm. The dimension Wcb of the second sub-segment 40cb in the direction perpendicular to its extension direction is less than or equal to the dimension Wca of the first sub-segment 40ca in the direction perpendicular to its extension direction.

[0124] For example, the dimension Wca of the first sub-segment 40ca in the direction perpendicular to its extension direction is 60 μm, 80 μm, or 90 μm. The dimension Wcc of the third sub-segment 40cc in the direction perpendicular to its extension direction is 60 μm, 65 μm, or 75 μm. The dimension Wcb of the second sub-segment 40cb in the direction perpendicular to its extension direction can be 60 μm, 70 μm, or 80 μm.

[0125] In some embodiments, such as Figure 6 As shown, the dimension Lca of the first sub-segment 40ca along its extension direction is ≥50μm. The angle between the extension direction of the first sub-segment 40ca and the extension direction of the second sub-segment 40cb is greater than 100°, and / or, the angle between the extension direction of the third sub-segment 40cc and the extension direction of the second sub-segment 40cb is greater than 100°; under this condition, the dimension Lcb of the second sub-segment 40cb along its extension direction is ≥100μm. The dimension Lcc of the third sub-segment 40cc along its extension direction is ≥600μm.

[0126] For example, the dimensions of a first sub-segment 40ca, a second sub-segment 40cb, and a third sub-segment 40ca of a connecting trace 40 in their extension directions are as follows: The dimension Lca of the first sub-segment 40ca in its extension direction can be 50 μm, 60 μm, and 90 μm. The dimension Lcb of the second sub-segment 40cb in its extension direction can be 100 μm, 120 μm, and 140 μm. The dimension Lcc of the third sub-segment 40cc in its extension direction can be 600 μm, 700 μm, and 800 μm.

[0127] Hereinafter, the dimension of the first sub-segment 40ca along its extension direction is called the length Lca of the first sub-segment, the dimension of the second sub-segment 40cb along its extension direction is called the length Lcb of the second sub-segment, the dimension of the third sub-segment 40cc along its extension direction is called the length Lcc of the third sub-segment, the dimension of the first sub-segment 40ca along its extension direction perpendicular to it is called the width Wca of the first sub-segment, the dimension of the second sub-segment 40cb along its extension direction perpendicular to it is called the width Wcb of the second sub-segment, and the dimension of the third sub-segment 40cc along its extension direction perpendicular to it is called the width Wcc of the third sub-segment.

[0128] In some embodiments, the widths of the three sub-segments of the third trace 40c gradually decrease.

[0129] For example, the width of the first sub-segment 40ca is greater than or equal to the width of the second sub-segment 40cb, and the width of the second sub-segment 40cb is greater than or equal to the width of the third sub-segment 40cc.

[0130] Since the widths of the three sub-segments in the third trace 40c are unequal, the width of the third trace 40c can be represented by the average width AWc. In some embodiments, the average width AWc of the third trace 40c is the weighted sum of the widths Wca of the first sub-segment 40ca, Wcb of the second sub-segment 40cb, and Wcc of the third sub-segment 40cc. The weight of the width Wca of the first sub-segment 40ca is the ratio of the length Lca of the first sub-segment 40ca to the total length of the third trace 40c; the weight of the width Wcb of the second sub-segment 40cb is the ratio of the length Lcb of the second sub-segment 40cb to the total length of the third trace 40c; and the weight of the width Wcc of the third sub-segment 40cc is the ratio of the length Lcc of the third sub-segment 40cc to the total length of the third trace 40c. See the following formula:

[0131]

[0132] For example: the length Lca of the first sub-segment 40ca can be 50μm, and the width Wca of the first sub-segment 40ca can be 80μm. The length Lcb of the second sub-segment can be 100μm, and the width Wcb of the second sub-segment can be 70μm. The length Lcc of the third sub-segment can be 600μm, and the width Wcc of the third sub-segment can be 60μm.

[0133] The average width AWc of the third trace segment 40c:

[0134]

[0135] In other words, the average width AWc of the third trace 40c is 62.67μm.

[0136] Hereinafter, the dimension of the first trace 40a along its extension direction is called the length La of the first trace, the dimension of the second trace 40b along its extension direction is called the length Lb of the second trace, the dimension of the third trace 40c along its extension direction is called the length Lc of the third trace, the dimension of the first trace 40a in the direction perpendicular to its extension direction is called the width Wa of the first trace, the dimension of the second trace 40b in the direction perpendicular to its extension direction is called the width Wb of the second trace, and the dimension of the third trace 40c in the direction perpendicular to its extension direction is called the width Wc of the third trace.

[0137] In some embodiments, the widths of the first segment 40a, the second segment 40b, and the third segment 40c included in a connecting trace 40 are not equal. Therefore, the width of the connecting trace 40 is represented by the average width AW. The average width AW of the connecting trace 40 is a weighted sum of the widths Wa of the first segment, Wb of the second segment, and Wc of the third segment. The weight of the width Wa of the first segment is the ratio of the length La of the first segment to the total length of the connecting trace 40; the weight of the width Wb of the second segment is the ratio of the length Lb of the second segment to the total length of the connecting trace 40; and the weight of the width Wc of the third segment is the ratio of the length Lc of the third segment to the total length of the connecting trace 40.

[0138]

[0139] In some embodiments, the dimension La of the first trace 40a along its extension direction is ≥200μm; the dimension Lb of the second trace 40b along its extension direction is ≥200μm; and the dimension Lc of the third trace 40c along its extension direction is ≥1200μm.

[0140] In some embodiments, such as Figure 17 As shown, Figure 17 This disclosure provides a structural diagram of the front portion of the display panel 100, in which the average widths of the different connecting traces 40 are not equal, and the average width of the connecting traces 40 is related to the width of the first electrode 30 electrically connected to the connecting trace 40.

[0141] In some embodiments, specifically, the ratio of the dimension of the first electrode 30 in the direction perpendicular to its extension direction to the dimension of the connecting trace 40 electrically connected to the first electrode 30 in the direction perpendicular to its extension direction is between 1 and 3. Wherein, the dimension of the first electrode 30 in the direction perpendicular to its extension direction is the width W30 of the first electrode, and the dimension of the connecting trace 40 in the direction perpendicular to its extension direction is the average width AW of the connecting trace 40. The width W30 of the first electrode and the average width AW of the connecting trace 40 are proportional, and this ratio ranges from 1 to 3, i.e.:

[0142]

[0143] For example, the first electrode 30 can be configured to transmit a VGB signal, a VR signal, or a constant voltage signal (GND signal). The first electrode 30 is electrically connected to a signal line 90 located on a first surface of the backplane. For example, the signal line 90 is used to connect the first electrode 30 and the light-emitting device 20. The width of the first electrode 30 is related to, for example, proportional to, the width of the signal line 90 to which it is electrically connected. According to electrical performance evaluation, the theoretical dimensions of different signal lines 90 in the direction perpendicular to their extension direction are different, with the signal line transmitting the constant voltage signal having the largest dimension in the direction perpendicular to its extension direction. Therefore, different signal lines 90 have different widths, different first electrodes 30 have different average widths, and the average width of different connecting traces 30 is also different, and the average width of the connecting trace 30 is proportional to the width of the signal line 90 to which it is electrically connected.

[0144] As a possible design, such as Figure 18 As shown, the multiple third-segment traces 40c include multiple straight segments arranged side by side. A selected edge Ae' is formed at the junction of the second surface 10b and the selected side surface. The two edges Ae adjacent to the selected edge Ae' are the first edge Ae1 and the second edge Ae2. Among the multiple connecting traces 40, the distance between the third-segment trace 40c of the connecting trace 40 closest to the first edge Ae1 and the first edge Ae1 is greater than or equal to 100 μm. Among the multiple connecting traces 40, the distance between the third-segment trace 40c of the connecting trace 40 closest to the second edge Ae2 and the second edge Ae2 is greater than or equal to 100 μm.

[0145] For example, in the multiple connecting traces 40, the third segment traces 40c are all straight segments. The multiple third segment traces 40c are electrically connected to at least one flexible circuit board 80. At least two third segment traces 40c connected to the same flexible circuit board 80 have a symmetry line S perpendicular to a selected side. The at least two third segment traces 40c connected to the same flexible circuit board 80 are called a group, and a group of third segment traces 40c corresponds to a symmetry line S.

[0146] Each third segment trace 40c includes two opposing sides: an inner side c1 and an outer side c2. The inner side c1 is closer to the outer side c2. The symmetry line S associated with this third segment trace 40c (the symmetry line S corresponding to a group of third segment traces 40c to which this third segment trace 40c belongs) is also included. The orthographic projection of the inner side c1 onto the second surface 10b is the inner side c1' of the third segment trace, and the orthographic projection of the outer side c2 onto the second surface 10b is the inner side c2' of the third segment trace. The distance between the third segment trace 40c closest to the first edge Ae1 and the first edge Ae1 is greater than or equal to 100 μm; that is, the distance K1 between the first edge Ae1 and its closest outer side c2' is greater than or equal to 100 μm. The distance between the third segment 40c of the connection trace 40 closest to the second edge Ae2 and the second edge Ae2 is greater than or equal to 100μm. That is, the distance K2 between the second edge Ae2 and the outer edge c2' of the third segment trace closest to it is greater than or equal to 100μm.

[0147] The third trace 40c extends into the bonding area and electrically connects to the flexible circuit board. Due to current manufacturing limitations and equipment precision requirements, the flexible circuit board 80 has tolerances, such as ±100μm. Misalignment may occur when bonding the flexible circuit board and multiple third traces. Alternatively, anisotropic conductive film (ACF) is typically used to connect multiple third traces to the flexible circuit board 80, but the position of the ACF can have an error of ±150μm during the bonding process. Therefore, in the direct bonding process between the third sub-segment 40c and the flexible circuit board 80, distances K1 and K2 must be greater than or equal to 100μm to meet current process requirements and equipment capabilities.

[0148] In some embodiments, the interconnect trace 40 is formed by laser etching of a metal layer. Specifically, a metal layer is formed on the portion of the first surface 10a of the backplane 10 near the selected side 10c, the portion of the second surface 10b near the selected side 10c, and the selected side by sputtering. Then, the unwanted portions of the metal layer are removed by laser etching, thus forming the interconnect trace 40.

[0149] Laser etching is used to process connection traces. A metal layer is formed by sputtering and then laser etching is performed. Compared with wet etching, laser etching is simpler, more convenient, and has higher production efficiency. In addition, there is no need to flip the display panel, which can reduce the production materials such as protective layers, further reduce production costs, improve product competitiveness, reduce scratches or dirt caused by contact between the display panel and equipment, and help improve product yield.

[0150] In some embodiments, such as Figure 19 As shown, the connecting trace 40 includes a first buffer conductive pattern t1, a main conductive pattern t2, and a second buffer conductive pattern t3 stacked sequentially. The first buffer conductive pattern t1 is closer to the backplate 10 than the main conductive pattern t2.

[0151] For example, a first buffer conductive pattern t1 is located near the backplate 10, and the material of the first buffer conductive pattern t1 includes at least one of molybdenum and titanium. The material of the main conductive pattern t2 includes at least one of copper and aluminum. The material of the second buffer conductive pattern t3 includes at least one of molybdenum, titanium, and indium tin oxide.

[0152] In some embodiments, such as Figure 20A and Figure 20B As shown, the display panel 100 also includes a first protective layer 60, which covers portions of a plurality of first electrodes 30, a first trace 40a, a second trace 40b, and a third trace 40c near a selected side 10cc. The first protective layer 60 fills the gaps between the plurality of first electrodes 30 and the pattern gaps of the first trace 40a, the second trace 40b, and the portion of the third trace 40c near the selected side.

[0153] For example, a metal layer is formed in a portion of the first surface 10a near the selected side 10c, a portion of the second surface 10b near the selected side 10c, and the selected side 10c. The metal layer is patterned by laser etching to obtain multiple connection traces 40. To protect the connection traces 40, a first protective layer 60 is formed covering the portions of the first trace 40a, the second trace 40b, and the third trace 40c near the selected side 10c. Simultaneously, the first protective layer 60 also covers the portion of the first electrode 30 connected to the connection traces 40.

[0154] The first protective layer 60 is an insulating material with high corrosion resistance and adhesion. For example, the first protective layer 60 can be an overcoating (OC) adhesive. For instance, the material of the first protective layer 60 may include a dark-colored OC adhesive or a dark-colored ink. Ink has high hardness and good corrosion resistance, enabling it to protect multiple connection traces.

[0155] In some embodiments, such as Figure 20A or Figure 20B As shown, the display panel 100 also includes a second protective layer 70A, which covers the portion of the plurality of light-emitting devices 20 and the portion of the first protective layer 60 located on the first surface 10a, and fills the area between the light-emitting devices 20 and between the light-emitting devices 20 and the first electrode 30.

[0156] The portion of the second protective layer 70A covering the multiple light-emitting devices 20 should be selected in terms of material and thickness without affecting the set brightness of the light-emitting devices 20.

[0157] For example, after the first protective layer 60 is coated, a protective film is applied to the non-display side of the display panel 100 (this protective film is removed in subsequent processes). Then, the light-emitting devices 20 are fabricated on the display side of the display panel 100, for example, by bonding LED chips and a microcontroller chip, which controls the LED chips to emit light. After completing the above processes, a second protective layer 70A is applied to the portion of the light-emitting devices 20 and the first protective layer 60 located on the first surface 10a. The second protective layer 70A covers multiple light-emitting devices 20 and fills the gaps between the multiple light-emitting devices 20 and the area between the light-emitting devices 20 and the first electrode 30. The second protective layer 70A can be an overcoating adhesive; for example, the material of the second protective layer 70A can include dark-colored overcoating adhesive or dark-colored ink. The side of the second protective layer 70A away from the backplate 10 is flat.

[0158] The second protective layer 70A is configured to protect multiple light-emitting devices 20 and to provide electrical insulation and protection against water and oxygen corrosion, thereby preventing the multiple light-emitting devices 20 from being damaged by external factors, such as being knocked off or being oxidized, and ensuring the light-emitting performance of the light-emitting devices 20.

[0159] In other embodiments, such as Figure 20B As shown, the display panel 100 may also include a third protective layer 70B, which at least covers the portion of the first protective layer 60 located on the side 10c and the second surface 10b, as well as the third segment of the multiple connecting traces 40c.

[0160] In some examples, the third protective layer 70B covers the portion of the first protective layer 60 located on the side 10c and the second surface 10b, the third segment of the multiple connecting traces 40c, and the entire second surface 10b.

[0161] For example, after the second protective layer 70A is attached, the flexible circuit board 80 is bonded to the third sub-trace of the third segment trace 40c. For instance, the flexible circuit board 80 and the third sub-trace of the third segment trace 40c are bonded by a hot-pressing process. Then, a third protective layer 70B is applied to the side of the first protective layer 60 away from the side 10c and the side of the third segment trace 40c away from the second surface 10b. The third protective layer 70B can be a fluorinated layer, and a fluorinated agent can be used. The third protective layer 70B covers the portion of the first protective layer 60 located on the side 10c and the second surface 10b, as well as the portion connecting the trace 40 and the flexible circuit board 80, and also covers the portion of the flexible circuit board 80 bonded to the third sub-trace.

[0162] The third protective layer 70B can further protect the display side and non-display side of the display panel, preventing external damage and water and oxygen corrosion to the multiple connecting lines 40 and the part where the connecting lines 40 are connected to the flexible circuit board 80, thus affecting the stability of the connection.

[0163] like Figure 21A and Figure 21B As shown, some embodiments of this disclosure also provide a display device 1000, including a display panel 100 and a driving circuit board 200 as provided in any of the above embodiments. The driving circuit board 200 is disposed on the second surface 10b of the back plate 10 of the display panel 100. The driving circuit board 200 is electrically connected to a plurality of first electrodes 30 of the display panel 100 through a flexible circuit board and a plurality of connecting traces 40 of the display panel 100.

[0164] For example, after the drive circuit board 200 is connected to one end of the flexible circuit board, the other end of the flexible circuit board and the third sub-segment 40c of the multiple connecting traces 40 are connected in the bonding area CC.

[0165] The display device 1000 uses the display panel 100 provided in the above embodiments and has the same technical effects as the display panel 100 described above, which will not be described in detail here.

[0166] like Figure 22 As shown, some embodiments of this disclosure also provide a splicing display device 10000, including the display device 1000 as provided in the above embodiments, and multiple display devices 1000 spliced ​​together.

[0167] The splicing display device 10000 adopts the display device 1000 provided in the above embodiment and has the same technical effect as the display device 1000 described above, which will not be elaborated here.

[0168] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display panel, comprising: a back plate comprising a first surface, a second surface opposite to the first surface, and a plurality of side surfaces connecting the first surface and the second surface, wherein at least one of the plurality of side surfaces is a selected side surface; a plurality of light emitting devices disposed on the first surface; a plurality of first electrodes disposed on the first surface and close to the selected side surface; a plurality of connection wires, each of which comprises a first wire segment, a second wire segment and a third wire segment connected in sequence, the first wire segment is disposed on the first surface and electrically connected with one of the plurality of first electrodes, the second wire segment is disposed on the selected side surface, and the third wire segment is disposed on the second surface and electrically connected with a flexible printed circuit board; the third wire segment comprises a first sub-wire segment, a second sub-wire segment and a third sub-wire segment connected in sequence, the first sub-wire segment is close to the selected side surface; the first sub-wire segment and the second sub-wire segment are connected through a first connecting portion; wherein the first connecting portion comprises opposite first inner side surface and first outer side surface, the first inner side surface is projected on the back plate as a first inner edge, the first outer side surface is projected on the back plate as a first outer edge, and the first inner edge is a curve; and / or the first outer edge is a curve.

2. The display panel of claim 1, wherein: the first sub-wire segments of the plurality of connection wires are arranged side by side, and the third sub-wire segments of the plurality of connection wires are arranged side by side; the extension direction of the first sub-wire segment intersects with the extension direction of the second sub-wire segment, and the extension direction of the second sub-wire segment intersects with the extension direction of the third sub-wire segment; and the angle formed between the extension direction of the first sub-wire segment and the extension direction of the second sub-wire segment ranges from 90° to 180°.

3. The display panel of claim 2, wherein: the first sub-wire segment comprises opposite first sub-wire segment inner side surface and first sub-wire segment outer side surface, the first sub-wire segment inner side surface is projected on the back plate as a first sub-wire segment inner edge, and the first sub-wire segment outer side surface is projected on the back plate as a first sub-wire segment outer edge; the second sub-wire segment comprises opposite second sub-wire segment inner side surface and second sub-wire segment outer side surface, the second sub-wire segment inner side surface is projected on the back plate as a second sub-wire segment inner edge, and the second sub-wire segment outer side surface is projected on the back plate as a second sub-wire segment outer edge; the first inner edge is connected with the first sub-wire segment inner edge and the second sub-wire segment inner edge, and the first outer edge is connected with the first sub-wire segment outer edge and the second sub-wire segment outer edge.

4. The display panel of claim 3, wherein, the first inner edge is an arc, and / or the first outer edge is an arc.

5. The display panel of claim 3, wherein, the first inner edge comprises a plurality of broken line segments connected in sequence, and the angle formed between one of the plurality of broken line segments of the first inner edge and the first sub-wire segment inner edge ranges from 170° to 177°. An angle formed between two connected line segments of the first inner edge ranges from 170° to 177°. An angle formed between a line segment of the first inner edge connected with the second sub-line segment inner side and the second sub-line segment inner side ranges from 170° to 177°. And / or, The first outer edge comprises a plurality of connected line segments, and an angle formed between a line segment of the first outer edge connected with the first sub-line segment outer side and the first sub-line segment outer side ranges from 170° to 177°. An angle formed between two connected line segments of the first outer edge ranges from 170° to 177°. An angle formed between a line segment of the first outer edge connected with the second sub-line segment outer side and the second sub-line segment outer side ranges from 170° to 177°.

6. The display panel of any one of claims 2 to 5, wherein, An angle formed between the extending direction of the third sub-line segment and the extending direction of the second sub-line segment ranges from 90° to 180°.

7. The display panel of claim 6, wherein, The third sub-line segment and the second sub-line segment are connected by a second connecting part. The second connecting part comprises opposite second inner and outer sides, the second inner side is a second inner edge in orthographic projection on the back plate, and the second outer side is a second outer edge in orthographic projection on the back plate. The third sub-line segment comprises opposite third sub-line segment inner and outer sides, the third sub-line segment inner side is a third sub-line segment inner edge in orthographic projection on the back plate, and the third sub-line segment outer side is a third sub-line segment outer edge in orthographic projection on the back plate. The second sub-line segment comprises opposite second sub-line segment inner and outer sides, the second sub-line segment inner side is a second sub-line segment inner edge in orthographic projection on the back plate, and the second sub-line segment outer side is a second sub-line segment outer edge in orthographic projection on the back plate. The second inner edge is connected with the third sub-line segment inner edge and the second sub-line segment inner edge, and the second outer edge is connected with the third sub-line segment outer edge and the second sub-line segment outer edge.

8. The display panel of claim 7, wherein, The second inner edge is a curve; and / or, the second outer edge is a curve.

9. The display panel of claim 8, wherein, The second inner edge is an arc, and / or, the second outer edge is an arc.

10. The display panel of claim 7, wherein, The second inner edge comprises a plurality of connected line segments, and an angle formed between a line segment of the second inner edge connected with the third sub-line segment inner side and the third sub-line segment inner side ranges from 170° to 177°. An angle formed between two connected line segments of the second inner edge ranges from 170° to 177°. An angle formed between a line segment of the second inner edge connected with the second sub-line segment inner side and the second sub-line segment inner side ranges from 170° to 177°. And / or, The second outer edge comprises a plurality of broken line segments connected in sequence, and an angle between one of the plurality of broken line segments of the second outer edge and the third sub-line outer side edge is in a range of 170° to 177°. An angle between two of the plurality of broken line segments of the second outer edge is in a range of 170° to 177°. An angle between one of the plurality of broken line segments of the second outer edge and the second sub-line outer side edge is in a range of 170° to 177°.

11. The display panel of any one of claims 7 to 10, wherein, The plurality of connection wires are divided into at least one connection wire group, and each connection wire group comprises at least two connection wires. In each connection wire group, the extension direction of the first sub-line is the same as the extension direction of the third sub-line, and the distance between the third sub-line outer side edges of the two connection wires farthest apart is less than the distance between the first sub-line outer side edges of the two connection wires farthest apart.

12. The display panel of claim 11, wherein, In the same connection wire group, the distance between the two third sub-lines of adjacent connection wires is less than the distance between the two first sub-lines of adjacent connection wires. The distance between the two third sub-lines of adjacent connection wires is the distance between the third sub-line outer side edge of one third sub-line and the third sub-line inner side edge of the other third sub-line. The distance between the two first sub-lines of adjacent connection wires is the distance between the first sub-line outer side edge of one first sub-line and the first sub-line inner side edge of the other first sub-line.

13. The display panel of claim 12, wherein, The distance between the third sub-line outer side edges of the two connection wires closest apart in adjacent connection wire groups is greater than 1000 μm.

14. The display panel of claim 12 or 13, wherein, The second surface and each of the plurality of side surfaces form an edge, and the second surface and the selected side surface form a selected edge; two edges adjacent to the selected edge are a first edge and a second edge. The distance between the third sub-line of the connection wire closest to the first edge and the first edge is greater than or equal to 100 μm. The distance between the third sub-line of the connection wire closest to the second edge and the second edge is greater than or equal to 100 μm.

15. The display panel of claim 14, wherein, The distance between the first sub-lines of adjacent connection wires in the connection wire group is 10 to 60 μm.

16. The display panel of claim 14, wherein, The distance between the third sub-lines of adjacent connection wires in the connection wire group is greater than or equal to 10 μm.

17. The display panel of claim 15 or 16, wherein, A ratio of a size of the first electrode in a direction perpendicular to an extending direction of the first electrode to a size of the connection trace electrically connected to the first electrode in a direction perpendicular to an extending direction of the connection trace is between 1 and 3.

18. The display panel of claim 17, wherein, An angle between an extending direction of the first sub-line segment and an extending direction of the second sub-line segment is in a range of 100° to 180°; and / or, an angle between an extending direction of the third sub-line segment and an extending direction of the second sub-line segment is in a range of 100° to 180°; a size of the second sub-line segment in the extending direction thereof is greater than or equal to 100 um.

19. The display panel of claim 18, wherein, The second surface comprises a binding area, the third sub-line segment extends into the binding area, and the third sub-line segment is configured to bind the flexible circuit board in the binding area.

20. The display panel of claim 1, wherein, The plurality of third trace segments comprises a plurality of straight line segments arranged side by side. The second surface and the selected side surface meet to form a selected edge; two edges adjacent to the selected edge are a first edge and a second edge. A distance between a third trace segment of a connection trace closest to the first edge among the plurality of connection traces and the first edge is greater than or equal to 100 um. A distance between a third trace segment of a connection trace closest to the second edge among the plurality of connection traces and the second edge is greater than or equal to 100 um.

21. A display device, comprising: The display panel according to any one of claims 1-20; A driving circuit board disposed on a second surface of a back plate of the display panel, the driving circuit board being electrically connected to the plurality of first electrodes of the display panel through the flexible circuit board and the plurality of connection traces of the display panel.

22. A tiled display apparatus comprising: A plurality of display devices according to claim 21, the plurality of display devices being assembled by splicing.

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