Display panel and display device

Abstract

The invention provides a display panel and a display device, and relates to the technical field of display, and the display panel comprises an array layer, a bonding layer and a light-emitting element; the display panel comprises a display area and a non-display area at least partially surrounding the display area, the bonding layer comprises a plurality of connecting parts located in the display area and a plurality of auxiliary parts located in the non-display area, the light-emitting elements are electrically connected with the array layer through the connecting parts, and at least part of the auxiliary parts are arranged at intervals. Therefore, equivalently, the bonding layer in the non-display area is decomposed into a plurality of independent auxiliary parts, and the stress accumulation range can be effectively limited in each independent auxiliary part. When the stress is accumulated in a certain auxiliary part, the stress can be more easily diffused or released outwards through the edge of the auxiliary part, the problem that the bonding layer of the display area is wrinkled due to the large stress when the large-area auxiliary part exists is effectively solved, and the influence of the stress on the display area is reduced or avoided.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a display panel and a display device. BACKGROUND

[0002] Micro LED display panel technology is an important development direction of next-generation display technology, and has great application potential in ultra-high-definition display, virtual reality (VR) / augmented reality (AR) and wearable devices, etc. due to its self-emission, high brightness, high contrast, wide color gamut, fast response and excellent energy efficiency ratio.

[0003] In the manufacturing process of the Micro LED display panel, the mass transfer technology is one of the key bottlenecks for its commercialization. Among them, the eutectic bonding as a high-efficiency and reliable mass transfer scheme has attracted widespread attention in the industry. The eutectic bonding usually involves preparing a metal thin film as a eutectic layer on the receiving substrate. For example, the substrate surface is evaporated with gold-tin (AuSn) alloy, and the liquid alloy is formed by heating to reach the eutectic temperature, so as to realize the reliable connection of the Micro LED chip and the driving substrate.

[0004] However, in the process of evaporating the metal thin film on the entire eutectic layer, there is a common and severe technical challenge of controlling the internal stress of the thin film. In the non-display area, when the internal stress of the metal film exceeds a certain threshold, the thin film will macroscopically release the accumulated stress by forming a wrinkle structure, and the stress is likely to spread to the display area and cause the evaporation pattern in the display area to deviate, affecting the correct connection of the Micro LED chip and the driving substrate in the display area. SUMMARY

[0005] To solve the above technical problems, the present disclosure provides a display panel and a display device, aiming to alleviate the problem of wrinkles in the bonding layer of the display area caused by large stress when the large-area auxiliary part exists, and reduce or avoid the influence of stress on the display area.

[0006] In a first aspect, the present disclosure provides a display panel, comprising: an array layer, a bonding layer and a light emitting element.

[0007] The display panel comprises a display area and a non-display area surrounding the display area at least in part, the bonding layer comprises a plurality of connection parts located in the display area and a plurality of auxiliary parts located in the non-display area, the light emitting element is electrically connected to the array layer through the connection part, and at least part of the auxiliary parts are arranged at intervals.

[0008] In a second aspect, based on the same inventive concept, the present disclosure provides a display device comprising the display panel provided in the first aspect of the present disclosure.

[0009] The technical scheme provided by the embodiments of the present disclosure has the following advantages compared with the prior art:

[0010] In the display panel and display device provided by the embodiments of the present disclosure, the auxiliary parts in the bonding layer are arranged in multiple numbers, and at least part of the auxiliary parts are arranged in a spaced manner in the non-display area, and the non-continuous full-area layer. When the bonding layer in the non-display area is designed in this kind of dispersed patterning, it is equivalent to decomposing a large-area continuous film into multiple independent small structures, which can effectively limit the stress accumulation range within each independent small area. The total amount of stress accumulation in each small area is much smaller than that of the whole film, so it is not easy to reach the critical stress that causes wrinkles. Moreover, after patterning the bonding layer in the non-display area, the total number of film edges of the auxiliary parts is increased, and the increase of the film edges provides more free surfaces, which can serve as channels for stress release. When stress accumulates in a small auxiliary part, it can more easily diffuse outward through the edge of the auxiliary part or release through slight local deformation, rather than accumulating to a sufficient extent to cause large-area wrinkles. Thus, the problem of the connection part in the display area being deviated due to wrinkles caused by larger stress in the related art is effectively improved, thereby facilitating the improvement of the accuracy of subsequent processes, such as the alignment accuracy of the mass transfer and the connection accuracy and reliability of the light-emitting element and the array layer.

[0011] In addition, the spaced arrangement of the auxiliary parts may, to some extent, change the local heat dissipation path, which helps to more evenly heat and cool, thereby further controlling the stress formation and release in the bonding process. Since wrinkles and stress concentration are important causes of displacement of light-emitting elements, electrical connection failure or short circuit, the introduction of the spaced auxiliary parts directly reduces the defect rate in the manufacturing process by alleviating these problems, thereby improving the overall yield of the display panel. Moreover, the spaced arrangement of the auxiliary parts relieves the residual stress inside the panel, which helps to improve the stability and life of the display panel under long-term work (especially heating) and environmental changes (such as temperature cycling), and avoids the performance degradation or structural damage caused by stress release in the later stage. BRIEF DESCRIPTION OF DRAWINGS

[0012] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure together with the specification.

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced here. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0014] Figure 1 Fig. 1 shows a structural schematic diagram of a display panel provided by an embodiment of the present disclosure.

[0015] Figure 2 Fig. 1 shows a structure diagram of a bonding layer in a display panel provided by an embodiment of the present disclosure;

[0016] Figure 3 Fig. 2 shows a BB cross-sectional view of the display panel in Fig. 1; Figure 1

[0017] Figure 4 Fig. 3 shows a partial schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0018] Figure 5 Fig. 4 shows another partial schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0019] Figure 6 Fig. 5 shows a CC cross-sectional view of the display panel in Fig. 4; Figure 1

[0020] Figure 7 Fig. 6 shows another partial schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0021] Figure 8 Fig. 7 shows another partial schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0022] Figure 9 Fig. 8 shows another partial schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0023] Figure 10 Fig. 9 shows another partial schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0024] Figure 11 Fig. 10 shows another partial schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0025] Figure 12 Fig. 11 shows another partial schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0026] Figure 13 Fig. 12 shows another CC cross-sectional view of the display panel in Fig. 11; Figure 1

[0027] Fig. 13 shows a relative position relationship diagram of a common voltage signal line and an auxiliary part in a non-display area; Figure 14

[0028] Fig. 14 shows a structure schematic diagram of a display device provided by an embodiment of the present disclosure. Figure 15 DETAILED DESCRIPTION

[0029] ​​​In order to enable a more clear understanding of the above-mentioned objects, features and advantages of the present disclosure, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other different manners from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0031] In the related art, when a large-area metal film is evaporated in the non-display area of the display panel as a bonding layer, when the internal stress of the metal film exceeds a certain threshold value, the thin film will release the accumulated stress macroscopically by forming a wrinkle structure. Although the formation of such wrinkles partially releases the internal stress of the entire thin film, it causes a large stress concentration in the local area of the bonding layer. These stresses will accumulate at the wrinkle and propagate along the internal structure or interface of the material. Especially in the areas with complex geometry, weak material connection or sensitive to external stress, such as the boundary of the display area, the accumulated stress will be more easily released. Such stress release may manifest as local displacement, distortion or deformation of the evaporated bonding layer in the display area, thereby affecting the uniformity of the bonding layer in the display area, the bonding reliability, and even possibly causing the misalignment or electrical short circuit of the Micro LED chip, which seriously affects the performance and yield of the display panel. Therefore, how to effectively control the internal stress of the bonding layer and avoid the formation of wrinkles and the subsequent problems caused thereby is one of the key technical problems that need to be solved in the manufacturing of Micro LED display panels.

[0032] To this end, the present disclosure provides a display panel, Figure 1 Fig. 1 shows a structural schematic diagram of a display panel provided by an embodiment of the present disclosure, Figure 2 Fig. 2 shows a structural diagram of a bonding layer in a display panel provided by an embodiment of the present disclosure, which clearly shows the arrangement of the bonding layer, Figure 2 The light emitting element is not shown. Figure 3 Fig. 3 shows a BB cross-sectional view of a display panel, Figure 1 Fig. 4 shows a BB cross-sectional view of a display panel, Figures 1 to 3 The display panel 100 provided by the embodiment of the present disclosure includes an array layer 01, a bonding layer 10 and a light emitting element D0.

[0033] The display panel 100 includes a display area AA and a non-display area NA surrounding at least part of the display area AA, the bonding layer 10 includes a plurality of connection parts 11 located in the display area AA and a plurality of auxiliary parts 12 located in the non-display area NA, the light emitting element D0 is electrically connected to the array layer 01 through the connection part 11, and at least part of the auxiliary parts 12 are arranged at intervals in the non-display area NA.

[0034] When the auxiliary portions 12 in the bonding layer 10 exist in the form of a full-surface film in the non-display area NA, it forms a continuous, large-area film structure. In this structure, if the film itself has internal stress (whether it is deposition stress or thermal stress), the stress will accumulate throughout the film, eventually causing the film to buckle and wrinkle, especially in areas where the adhesion of the film to the substrate is insufficient or the stress is excessive. Once wrinkles are generated, the accompanying tension can spread to the edge pixels of the display area AA, causing the connecting portions 11 in the display area AA to shift.

[0035] Therefore, in the embodiments of the present disclosure, the auxiliary portions 12 in the bonding layer 10 are arranged in multiple numbers, and at least part of the auxiliary portions 12 are arranged in a spaced-apart manner in the non-display area NA, rather than in a continuous full-surface structure. When the bonding layer 10 in the non-display area NA is designed in this kind of dispersed and patterned manner, it is equivalent to decomposing a large-area continuous film into multiple independent small structures, which can effectively limit the range of stress accumulation to each small area corresponding to each auxiliary portion 12. The total amount of stress accumulation in each small area is much smaller than that in a full-surface film, so it is less likely to reach the critical stress that causes wrinkles. Moreover, after the bonding layer 10 in the non-display area NA is patterned, the total number of film edges of the auxiliary portions 12 is increased, and the increase in the number of film edges provides more free surfaces, which can serve as channels for stress release. When stress accumulates in a small auxiliary portion 12, it can more easily diffuse outward through the edges of the auxiliary portion 12 or release through slight local deformation, rather than accumulating to a sufficient extent to cause large-area wrinkles. Thus, the problem of the connecting portions 11 in the display area AA shifting due to wrinkles caused by excessive stress in the related art is effectively improved, which is conducive to improving the accuracy of subsequent processes, such as improving the alignment accuracy of the giant transfer and the connection accuracy and reliability of the light-emitting elements D0 and the array layer 01.

[0036] In addition, the spaced-apart arrangement of the auxiliary portions 12 can change the local heat dissipation path to some extent, which helps to heat and cool more uniformly, thereby further controlling the formation and release of stress during the bonding process. Since wrinkles and stress concentration are important causes of displacement of the light-emitting elements D0, electrical connection failure or short circuit, the introduction of the spaced-apart auxiliary portions 12 directly reduces the defect rate in the manufacturing process by alleviating these problems, thereby improving the overall yield of the display panel. Moreover, the spaced-apart arrangement of the auxiliary portions 12 relieves the residual stress inside the panel, which helps to improve the stability and life of the display panel under long-term operation (especially heating) and environmental changes (such as temperature changes), and avoids the performance degradation or structural damage caused by stress release in the later stage.

[0037] It should be noted that, Figure 1 and Figure 2The display panel is only taken as an example of a rectangular structure, and the actual shape of the display panel is not limited. In some other embodiments of the present disclosure, the display panel can also be in any other feasible shape such as a circular shape, a rounded rectangular shape, or the like. Optionally, the display panel provided in the present embodiment can be a Micro LED display panel, and the corresponding light emitting element D0 is a Micro LED. Figure 3 The film layer structure shown is only schematic, and the number and size of the film layers actually included in the display panel are not limited.

[0038] Optionally, please refer to Figure 3 The display panel includes an array layer 01 arranged on one side of the substrate 00. The array layer 01 includes a semiconductor layer 90, a first metal layer m1, a capacitor metal layer mc, a second metal layer m2, a third metal layer m3, and a fourth metal layer m4. The adjacent metal layers are separated by an insulating layer. Optionally, the semiconductor layer 90 is located between the first metal layer m1 and the substrate 00. The capacitor metal layer mc is located between the first metal layer m1 and the second metal layer m2. The first metal layer m1 is located on the side of the capacitor metal layer mc facing the substrate 00. The second metal layer m2 is located on the side of the capacitor metal layer mc away from the substrate 00. The third metal layer m3 is located on the side of the second metal layer m2 away from the substrate 00. The fourth metal layer m4 is located on the side of the third metal layer m3 away from the substrate 00. When the array layer 01 of the display panel includes a plurality of transistors, the gate of the transistor can be located on the first metal layer m1, and the source and the drain can be located on the second metal layer m2. The first metal layer m1 and the second metal layer m2 can also be provided with a plurality of signal lines. Similarly, the third metal layer m3 and the capacitor metal layer mc can also be provided with signal lines. The capacitor metal layer mc is also used to overlap the second metal layer m2 or the first metal layer m1 to form a storage capacitor in a pixel circuit. The fourth metal layer m4 can form a pad such as a first pad P1 and a second pad P2 for connecting with the light emitting element D0. It should be noted that Figure 3 The film layer diagram is only schematic, and the present disclosure is not limited thereto.

[0039] Figure 4 The display panel provided in the present embodiment is shown in a partial schematic view. Please refer to Figure 4In an optional embodiment of the present disclosure, the minimum distance A1 / A2 between the auxiliary portion 12 in the non-display area NA and the connecting portion 11 in the display area AA is greater than 0. If there is no gap (i.e. the minimum distance is 0) between the auxiliary portion 12 and the connecting portion 11, the auxiliary portion 12 and the connecting portion 11 may actually constitute a continuous whole, or at least a closely connected area. In this case, stress may still be directly transmitted and concentrated from the auxiliary portion 12 to the connecting portion 11 and the display area AA boundary where the connecting portion 11 is located. Therefore, the present embodiment sets the minimum distance between the auxiliary portion 12 and the connecting portion 11 to be greater than 0, and there is a gap between the two, which is equivalent to establishing a stress isolation belt between the two. The stress generated by the auxiliary portion 12 in the non-display area NA (even if it is wrinkled) cannot directly cross the gap between the auxiliary portion 12 and the connecting portion 11. The stress needs to be transmitted through the substrate material or the upper structure, but such transmission will be significantly attenuated by the distance. Therefore, the physical tension of the wrinkle is avoided from directly acting on the connecting portion 11 of the display area AA boundary pixel, thereby effectively preventing the corresponding metal of the connecting portion 11 from being offset.

[0040] In addition, considering that the connecting portion 11 is a key area for electrical connection between the light-emitting element and the array layer 01. If there is no effective distance between the auxiliary portion 12 and the connecting portion 11, especially when there is manufacturing deviation or stress deformation, the auxiliary portion 12 may accidentally contact the connecting portion 11, causing short circuit or unnecessary parasitic capacitance / resistance, thereby affecting the normal work of the display element. Therefore, the scheme that the minimum distance between the auxiliary portion 12 and the connecting portion 11 is greater than 0 effectively eliminates this potential electrical risk and ensures the purity and independence of the electrical connection of the display area AA.

[0041] Figure 5 Another partial schematic view of the display panel provided by the present embodiment is shown. Please refer to Figure 5In an optional embodiment of the present disclosure, the display area AA includes a plurality of pixel units P0 arranged in an array, each pixel unit P0 including at least two light emitting elements D0; this embodiment takes an example of a pixel unit P0 including six light emitting elements D0, which optionally include two red light emitting elements, two green light emitting elements, and two blue light emitting elements, but the present disclosure does not limit the number and color of light emitting elements D0 actually included in the pixel unit P0. In the first direction D1, the minimum distance between the connecting portions 11 corresponding to adjacent pixel units P0 is S1, and in the second direction D2, the minimum distance between the connecting portions 11 corresponding to adjacent pixel units P0 is S2; the first direction D1 and the second direction D2 intersect; in the first direction D1, the minimum distance between the auxiliary portion 12 and the connecting portion 11 is A1, and in the second direction D2, the minimum distance between the auxiliary portion 12 and the connecting portion 11 is A2, wherein A1≥S1 and / or A2≥S2.

[0042] In this embodiment, the distance (A1, A2) between the auxiliary portion 12 and the connecting portion 11 is at least not less than the distance (S1, S2) between the connecting portions 11 of the pixel units P0 in the display area AA, which means that the isolation band or gap provided between the connecting portion 11 and the auxiliary portion 12 between the non-display area NA and the display area AA is wide enough. If A1 or A2 is too small, even if the minimum distance between the auxiliary portion 12 and the connecting portion 11 is greater than 0, it may not be sufficient to effectively block the transmission of stress, or under the manufacturing tolerance, it is easy to cause the auxiliary portion 12 and the connecting portion 11 to accidentally contact when the stress is released. By setting A1≥S1 and / or A2≥S2, it is ensured that the stress can be more fully released in the non-display area NA, while minimizing its impact on the connecting portion 11 at the edge of the display area AA. This can effectively avoid wrinkles, deformation, or displacement of the light emitting elements at the boundary of the display area AA due to stress accumulation.

[0043] In the process of mass transfer of Micro LED, a pickup head or transfer device is usually designed to transfer multiple light emitting elements at a time. The minimum distance S1 between the connecting portions 11 corresponding to adjacent pixel units P0 and the minimum distance S2 between the connecting portions 11 corresponding to adjacent pixel units P0 are usually closely related to the size and arrangement accuracy of the pixel units P0. The distance A1≥S1 and / or A2≥S2 between the auxiliary portion 12 and the connecting portion 11 can provide a wider alignment tolerance for the mass transfer process. Even if there is a slight positioning deviation of the transfer head at the edge position, the auxiliary portion 12 of the non-display area NA will not be accidentally touched, affecting the transfer accuracy or causing short circuit. The wide distance helps to avoid accidental scratching, contamination, or damage to the auxiliary portion 12 of the non-display area NA when the mass transfer tool operates on the pixel units P0 of the display area AA, and vice versa, thereby facilitating improvement of transfer efficiency and yield.

[0044] Figure 6 Shown Figure 1 A CC-direction cross-sectional view of the display panel shows a relative positional relationship between the light emitting element D0 and the auxiliary portion 12 adjacent to the non-display area NA. Figure 6 In an optional embodiment of the present disclosure, the projections of the light-emitting element D0 and the auxiliary part 12 do not overlap in a direction perpendicular to the plane where the display panel is located. The light-emitting element D0 is a semiconductor device that requires precise electrical connection, and the auxiliary part 12 is part of the bonding layer 10, which is usually made of a conductive material (such as a metal alloy). If the projection of the light-emitting element D0 in the vertical direction overlaps with the auxiliary part 12, it means that there is a potential risk that the bottom or side of the light-emitting element D0 will be in direct contact with the auxiliary part 12. This accidental contact will cause an electrical short circuit of the light-emitting element D0. For example, the P-type or N-type electrode of the light-emitting element D0 may be directly short-circuited to the auxiliary part 12, and then short-circuited to a circuit or ground wire that should not be connected, resulting in the pixel not lighting up, abnormal display, or even failure of the entire display area AA. Therefore, setting the light-emitting element D0 and the auxiliary part 12 to a non-overlapping projection relationship fundamentally eliminates the hidden danger of short circuit in this structure. It ensures that there is no conductive auxiliary portion 12 below or above the light emitting element D0 that should not be contacted in the Z-axis direction of the display panel, thereby ensuring the independent electrical function of the light emitting element D0.

[0045] Moreover, during the mass transfer process, the light-emitting element D0 needs to be accurately picked up and placed on the connecting portion 11. If the auxiliary portion 12 overlaps the light-emitting element D0 in the vertical direction, it may cause physical interference on the transfer path, causing the light-emitting element D0 to deviate, flip, or even be damaged during the placement process. Therefore, the light-emitting element D0 and the auxiliary portion 12 are set to a non-overlapping projection relationship, providing a clear and unobstructed space for the mass transfer tool and the light-emitting element D0 to fall. This helps to improve the alignment accuracy and bonding success rate of mass transfer, and reduce the yield loss caused by improper operation or structural interference.

[0046] Please continue to refer to Figure 4 In an optional embodiment of the present disclosure, the non-display area NA includes a plurality of auxiliary units 20, the auxiliary unit 20 includes at least one auxiliary portion 12, and among the plurality of auxiliary units 20 arranged in the same direction, the distance between two adjacent auxiliary units 20 is equal.

[0047] When the auxiliary units 20 arranged in the same direction are arranged equidistantly in the non-display area NA, it ensures that the stress release points inside the non-display area NA are uniformly distributed. This means that, in the entire non-display area NA, no matter where the position is, the local deformation or wrinkle caused by the film internal stress can be released in a relatively uniform small range, avoiding the disorderly accumulation or local high concentration of stress inside the non-display area NA. If the auxiliary units 20 are irregularly spaced, new stress concentration may be formed in the area with smaller spacing, or excessive deformation may be caused in the area with larger spacing. The equidistant arrangement helps to maintain the balance of film stress release in the entire non-display area NA, thereby avoiding the generation of new structural problems.

[0048] In addition, when the auxiliary units 20 arranged in the same direction are arranged equidistantly, the mask design for evaporating or etching these structures is simpler and more standardized. Such a repetitive pattern is easy to design and manufacture, reducing the cost and error rate of complex masks. In batch production, the repeatability of the process is crucial. The uniform and equidistant arrangement of structures makes the parameter adjustment of key processes such as photolithography, evaporation, and etching simpler and more stable. The machine equipment can perform repetitive operations according to a fixed pitch, reducing the alignment deviation or process defects caused by irregular structures, thereby facilitating the improvement of manufacturing yield and production efficiency.

[0049] The above embodiments illustrate the equidistant arrangement of auxiliary units 20 in a single direction to help uniformly release stress, but the present disclosure is not limited thereto, for example, please refer to Figure 4 and Figure 7 In an optional embodiment of the present disclosure, the display panel includes a first non-display area NA1 extending along a first direction D1 and a second non-display area NA2 extending along a second direction D2, the first direction D1 and the second direction D2 intersect; in the first non-display area NA1, the distance d1 between the adjacent auxiliary units 20 along the first direction D1 is equal to the distance d2 between the adjacent auxiliary units 20 along the second direction D2 in the second non-display area NA2. Wherein, Figure 7 Fig. 4 shows another partial schematic view of the display panel provided by the embodiment of the present disclosure.

[0050] In the present embodiment, the auxiliary units 20 in the two intersecting directions (usually perpendicular) are arranged at equal intervals, which means that the stress release pattern is consistent and uniform in the entire non-display area regardless of the direction. This helps to ensure that the stress distribution of the entire panel is more balanced, avoiding local warping or distortion caused by uneven stress release in different directions.

[0051] In view of the fact that the coefficients of thermal expansion and shrinkage of materials can be different in different directions, the embodiments of the present disclosure help reduce the impact of the anisotropy of these materials on stress distribution by setting the same stress release structure spacing in two main directions, so that the panel exhibits more stable mechanical properties during manufacturing and use.

[0052] Please continue to refer to Figure 4 and Figure 7 In an optional embodiment of the present disclosure, one auxiliary unit 20 includes one auxiliary part 12, and the area of one auxiliary part 12 is greater than the area of one connecting part 11. One of the core functions of the auxiliary part 12 is to disperse and release the internal stress generated during manufacturing. When the area of one auxiliary part 12 is greater than the area of one connecting part 11, it means that the single auxiliary part 12 of the non-display area NA has a larger surface area to bear and buffer the internal stress of the film. A larger area provides more deformation space, so that the stress inside the film can be more fully released in the single auxiliary part 12, thereby reducing the tendency to form macroscopic wrinkles. Thus, it directly solves the problem of excessive internal stress leading to wrinkles mentioned in the related art. Although the area of the single auxiliary part 12 is increased, since they are arranged at intervals, the overall material is still more economical than a continuous full-surface layer, while more material advantages are concentrated on the key point that needs stress release.

[0053] Please continue to refer to Figure 7 In an optional embodiment of the present disclosure, the width m1 of the auxiliary part 12 in the first non-display area NA1 along the first direction D1 is greater than the width m2 of the auxiliary part 12 in the second non-display area NA2 along the first direction D1.

[0054] In the embodiments of the present disclosure, the first direction D1 can be regarded as the direction of the short side extension of the display panel, for example, and the second direction D2 can be regarded as the direction of the long side extension of the display panel, for example. The first non-display area NA1 can be regarded as the upper / lower frame area of the display panel, and the second non-display area NA2 can be regarded as the left / right frame area of the display panel. In the second non-display area NA2 (i.e., the left / right frame area), the width of the auxiliary part 12 along the first direction D1 is designed to be relatively small, so that the auxiliary part 12 for stress release and structural support occupies a smaller horizontal space on the left and right sides of the display panel. Since the auxiliary part 12 is part of the bonding layer 10, they occupy the physical space of the non-display area NA. By reducing the width of the auxiliary part 12 in the second non-display area NA2, the minimum width required for the left and right frames is directly reduced, thereby helping to achieve a narrower left and right frame design.

[0055] Please continue to refer to Figure 7In an optional embodiment of the present disclosure, the width n1 of the auxiliary portions 12 in the first non-display area NA1 along the second direction D2 is equal to the width n2 of the auxiliary portions 12 in the second non-display area NA2 along the second direction D2. By ensuring that the widths of these auxiliary portions 12 in the vertical direction are the same in both the upper and lower bezels and the left and right bezels, a more balanced, isotropic stress distribution and release mechanism can be achieved throughout the non-display area. This consistency in the vertical dimension helps to prevent uneven stress concentration due to variations in the vertical width of the auxiliary portions 12 in different bezel regions.

[0056] When the dimensions of the repeating structure are consistent in one main direction (here, the second direction D2), it is advantageous to simplify the design and manufacture of the photolithography mask. The uniform vertical width means that there are fewer variations in the mask pattern, which is advantageous for reducing mask costs and design errors. Manufacturing steps such as deposition, etching, and even pick-and-place operations can take advantage of these consistent dimensions. Equipment programming becomes more straightforward, and process parameters related to vertical features (e.g., etching time, exposure dose) can be applied uniformly, thereby facilitating improved process yield and consistency between batches.

[0057] Figure 8 Another partial schematic view of a display panel provided by an embodiment of the present disclosure is shown. Please refer to Figure 8 In an optional embodiment of the present disclosure, the display area AA includes a plurality of pixel units P0 arranged in an array along a first direction D1 and a second direction D2, one pixel unit P0 including m connection portions 11, the first direction D1 and the second direction D2 intersecting; the non-display area NA includes a first non-display area NA1 extending along the first direction D1, the first non-display area NA1 including a plurality of first auxiliary units 21 arranged along the first direction D1, one first auxiliary unit 21 including n auxiliary portions 12, wherein m = n.

[0058] In this embodiment, the number of auxiliary portions 12 in the first auxiliary units 21 of the first non-display area NA1 matches the number of connection portions 11 in the pixel units P0 (m = n), and this embodiment is described by taking m = n = 12 as an example, but it is not limited thereto. In this way, the stress management structure of the first non-display area NA1 and the basic units of the display area AA remain synchronized or coordinated in terms of quantity. This synchronization helps to achieve a more harmonious structural transition between the display area AA and the first non-display area NA1. Since the first non-display area NA1 is adjacent to the display area AA, this matching in terms of quantity can allow the auxiliary portions 12 to be more finely aligned or correspond to the structure of the edge pixels of the display area AA. At the boundary of the display area AA, the geometric relationship between the stress release points and the pixel connection points is more regular and controllable, thereby enabling more effective management of stress concentration that can occur in these critical interface regions.

[0059] If m = n, the same processing pitch and process flow as the connection part 11 corresponding to the pixel unit P0 of the display area AA can be adopted in the first direction D1 when manufacturing the auxiliary unit 20 of the first non-display area NA1. For example, if the arrangement period of the pixel unit P0 is related to the arrangement period of the first auxiliary unit 21, it will be helpful to standardize the mask design and equipment motion path of the processes such as photolithography, evaporation, etching, etc. Reducing the difference and complexity of process parameters helps to improve the automation degree and repeatability of the production line, thereby reducing the manufacturing cost and improving the yield. When the structures of different areas have similar periodicity or quantitative characteristics, it is more conducive to realize efficient mass production.

[0060] Please continue to refer to Figure 8 In an optional embodiment of the present disclosure, the display area AA includes a plurality of pixel column groups LZ arranged in the first direction D1, and each pixel column group LZ includes a plurality of pixel units P0 arranged in the second direction D2; the first auxiliary unit 21 is arranged corresponding to the pixel column group LZ and located in the extension direction of the pixel column group LZ.

[0061] By arranging the first auxiliary unit 21 corresponding to the pixel column group LZ and locating it in the extension direction of the pixel column group LZ, the layout of the first auxiliary unit 21 is accurately aligned with the connection part 11 of the periodically arranged light-emitting pixels inside the display area AA. This alignment helps to accurately guide the slight deformation or wrinkles of the non-display area NA caused by thin film stress to the non-display area NA domain between the pixel unit P0 and the first auxiliary unit 21, thereby avoiding affecting the key light-emitting elements D0 and the connection part 11. At the same time, this accurate correspondence also provides a clearer visual or mechanical alignment reference for the mass transfer process. The transfer equipment can use this correspondence between the pixel column group LZ and the first auxiliary unit 21 to realize more efficient and accurate light-emitting element transfer and bonding, further improving the production yield.

[0062] In addition, when the number of auxiliary parts 12 included in the first auxiliary unit 21 is the same as the number of connection parts 11 included in the pixel unit P0, the way of arranging the first auxiliary unit 21 in the extension direction of the pixel column group LZ makes it possible to adopt similar or related design rules and periodicity when designing the mask used to manufacture the pixel column group LZ and the first auxiliary unit 21. This simplifies the design of the mask and makes it possible to use uniform parameters and equipment paths for subsequent processes such as photolithography, evaporation, etching, etc., thereby improving the consistency and repeatability of the process.

[0063] Please continue to refer to Figure 8In an optional embodiment of the present disclosure, the distance e1 between two adjacent first auxiliary units 21 in the first direction D1 (specifically, the minimum distance between the auxiliary portions 12 of the two adjacent first auxiliary units 21 in the first direction D1) is equal to the distance e2 between two adjacent pixel units P0 in the first direction D1 (specifically, the minimum distance between the connecting portions 11 of the two adjacent pixel units P0 in the first direction D1). In this way, the repeating pattern of the auxiliary units 20 in the first non-display area NA1 is synchronized with the repeating pattern of the pixel units P0 in the display area AA. If the distances e1 and e2 in the first direction D1 are equal, the part of the photomask used to manufacture the pixel units P0 (especially the connecting portions 11 thereof) in the display area AA can be directly reused to manufacture the first auxiliary units 21 in the non-display area NA. Alternatively, the connecting portions 11 and the auxiliary portions 12 can share the same set of masks for manufacturing, thus directly reducing the total number of masks required. Masks are high-value consumables in the manufacturing process, and their design and manufacturing costs are very expensive. Reducing the number of masks can directly result in significant material cost savings. This greatly reduces the number of mask types and design complexity, thereby significantly reducing manufacturing costs. When the same mask is used, the core process steps such as photolithography, evaporation, etching, etc. used to form the connecting portions 11 and the auxiliary portions 12 can be highly reused. For example, the same exposure time, developer, etchant formulation, and even equipment parameters can be reused in different areas (the display area AA and the non-display area NA) or different steps, simplifying the process flow and management. Due to the use of the same mask, the connecting portions 11 and the auxiliary portions 12 have high consistency in geometry and size. This consistency reduces defects caused by differences in process parameters, thereby improving production yield and batch-to-batch reliability of the product.

[0064] Please continue to refer to Figure 8In an optional embodiment of the present disclosure, the distance e3 between two adjacent pixel units P0 in the second direction D2 (specifically, the minimum distance between the connecting portions 11 in two adjacent pixel units P0 in the second direction D2) is equal to the distance e4 between the first auxiliary unit 21 and the pixel unit P0 in the second direction D2 (specifically, the minimum distance between the auxiliary portion 12 and the connecting portion 11 in the first auxiliary unit 21 and the pixel unit P0 in the second direction D2). In this way, when the display area AA and the non-display area NA are evaporated or etched with the eutectic layer, one set or similar mask design rules can be used, which greatly reduces the types and design complexity of the mask, thereby significantly reducing the manufacturing cost and development cycle. The key process steps such as photolithography, evaporation, etching, etc. can use uniform motion pitch and process parameters in the entire panel area (including the display area AA and the non-display area NA). For example, the step distance of the exposure equipment, the scanning path of the etching equipment, etc. can be kept consistent, without frequent switching or adjustment. This greatly improves the production efficiency and automation level. The unified process parameters and equipment operation process can effectively reduce the process deviation caused by the area difference, thereby improving the yield and consistency of each batch of products.

[0065] By aligning the arrangement period of the auxiliary unit 20 with the arrangement period of the pixel unit P0, the stress release point in the first non-display area NA1 can be more accurately coordinated with the periodic structure inside the display area AA. This helps to accurately guide and limit the slight deformation or wrinkles caused by the internal stress of the thin film in the first non-display area NA1, thereby maximizing the integrity of the light emitting element D0 and the connecting portion 11. This periodic matching makes the transition of the entire panel from the display area AA to the first non-display area NA1 more smooth and continuous in structure. This helps to improve the overall mechanical stability of the panel and reduce local stress concentration caused by structural discontinuity under thermal cycling or external impact.

[0066] Please continue to refer to Figure 8 In an optional embodiment of the present disclosure, the distance e5 between two adjacent auxiliary portions 12 in the first auxiliary unit 21 in the first direction D1 is equal to the distance e6 between two adjacent connecting portions 11 in the pixel unit P0 in the first direction D1; the distance e7 between two adjacent auxiliary portions 12 in the first auxiliary unit 21 in the second direction D2 is equal to the distance e8 between two adjacent connecting portions 11 in the pixel unit P0 in the second direction D2.

[0067] Therefore, the mask pattern used to define the internal connection part 11 of the pixel unit P0 can be directly reused to form the auxiliary part 12 in the first auxiliary unit 21 without any modification, which is equivalent to unifying the microstructure patterns of two completely different areas (display functional area and stress management area). The mask is a very expensive tool in the manufacturing of Micro LED. In the embodiment, the separate design and manufacturing of the mask for the auxiliary part 12 are reduced or even avoided, which can effectively reduce the manufacturing cost. Moreover, the key processes such as evaporation, photolithography and etching of the entire panel can be carried out under unified stepping, alignment and exposure parameters. There is no need to switch masks or adjust process parameters in different areas, which greatly simplifies the production process, shortens the production cycle and improves the efficiency of automated production. Unified process parameters and masks mean that the structure consistency between product batches is very high, reducing defects caused by process switching or parameter differences, thereby significantly improving the yield.

[0068] Please continue to refer to Figure 8 In an optional embodiment of the present disclosure, the shapes and areas of the auxiliary part 12 in the first non-display area NA1 and the connection part 11 in the display area AA are the same. Therefore, in the photolithography process, the basic geometric pattern used to define the internal connection part 11 of the pixel unit P0 can be applied to define the auxiliary part 12 in the non-display area NA completely identically. Both can be made using the same pattern area on the same set of masks, or even the same mask. The design, verification and manufacturing cost of the mask is extremely high. By realizing the reuse of such a single basic pattern, the types and quantities of masks required can be minimized, thereby effectively saving costs. Moreover, the key processes such as evaporation, photolithography and etching of the entire panel can be carried out under completely unified parameters and device paths, without any pattern switching, parameter adjustment or process difference, which greatly simplifies the production process, shortens the production cycle and improves the efficiency of automated production.

[0069] When the shapes and areas of the connection part 11 and the auxiliary part 12 are the same, the material properties, stress response and thermal expansion / contraction behavior of the connection part 11 and the auxiliary part 12 will remain highly consistent when subjected to the same process. This means that the performance of the auxiliary part 12 when releasing stress will be very close to the expected performance of the connection part 11 under the same material. This geometric unity makes the transmission and release pattern of stress in the panel more predictable and controllable. The auxiliary part 12 can absorb and disperse local stress in a similar way to the connection part 11, thereby more effectively protecting the sensitive display area AA domain.

[0070] Figure 9 Another partial schematic view of the display panel provided by the embodiment of the present disclosure is shown. Please refer to Figure 9In an optional embodiment of the present disclosure, the non-display area NA includes a second non-display area NA2 extending along the second direction D2, and the second non-display area NA2 includes a plurality of second auxiliary units 22 arranged along the second direction D2, and each second auxiliary unit 22 includes p auxiliary parts 12, where p < n. n is the number of auxiliary parts 12 included in a first auxiliary unit 21. In this embodiment, p = 4 and n = 12 are taken as examples, but the present disclosure is not limited thereto.

[0071] In this embodiment, since the number of auxiliary parts 12 in each second auxiliary unit 22 in the second non-display area NA2 is reduced (p < n), the total width or spacing ratio of the auxiliary parts 12 required in the second non-display area NA2 (usually the left and right side frames) can be smaller. This directly helps to reduce the left and right side frame width of the display panel, making it narrower, thereby improving the screen-to-body ratio and visual aesthetics of the product, and meeting the market demand for narrow frames. The left and right side frames are usually relatively narrow, and may need to be provided with functional components such as wiring and integrated driving circuit, so reducing the number of auxiliary parts 12 in the second auxiliary unit 22 can reserve valuable physical space for these key functional components, making the design more compact and the functional integration higher.

[0072] Please continue to refer to Figure 9 In this embodiment, the shape and size of the auxiliary parts 12 included in the second auxiliary unit 22 are the same as those of the auxiliary parts 12 included in the first auxiliary unit 21, and are also the same as those of the connecting parts 11 included in the pixel units P0 in the display area AA. In this way, the same mask can be used to form the connecting parts 11 in the display area AA and the auxiliary parts 12 in the non-display area NA, and the shape and size of the openings in the mask are the same. This is beneficial to simplify the production process and reduce production costs.

[0073] Figure 10 Another partial schematic view of the display panel provided by the embodiment of the present disclosure is shown. Please refer to Figure 10 In an optional embodiment of the present disclosure, the auxiliary part 12 includes a first sub-auxiliary part 121 and a second sub-auxiliary part 122, the first sub-auxiliary part 121 is located between the second sub-auxiliary part 122 and the display area AA, and the arrangement density of the first sub-auxiliary part 121 is lower than that of the second sub-auxiliary part 122.

[0074] It is considered that the display area AA boundary is the most sensitive, most likely to accumulate and release stress area. By allowing the first sub-auxiliary part 121 close to the display area AA to have a lower arrangement density, a relatively "gentle" stress release area can be created. In this way, the intensity or frequency of stress release at the edge of the display area AA will be relatively low, thereby avoiding excessive local stress concentration at the key boundary and reducing the risk of wrinkles and deformation.

[0075] In contrast, the second sub-assist portions 122 away from the display area AA have a higher arrangement density, which enables them to more densely and strongly absorb and release the internal stress accumulated by the panel as a whole (or the non-display area NA body). This helps to ensure that most of the stress is effectively managed in the area away from the display area AA, further protecting the display area AA from being affected. This density gradient is similar to creating an elastic region in the material that gradually hardens from the display area AA outward, enabling the stress to smoothly transition from the display area AA to the stress release core area of the non-display area NA.

[0076] In the present embodiment, the assist portions 12 near the display area AA have a lower density, and the spacing between these conductive assist portions 12 is larger. This helps to reduce the parasitic capacitance and resistance effects near the boundary of the display area AA, thereby improving the integrity and electrical performance of the display signal. The sparser arrangement also means that the probability of accidental short circuiting of the conductive assist portions 12 is lower at the edge of the display area AA, which further improves the reliability of the product.

[0077] In addition, the boundary near the display area AA is usually the area with the highest manufacturing alignment and precision requirements. By setting the first sub-assist portions 121 to have a lower density, it is possible to provide more fault tolerance space for photolithography, evaporation or pick-and-place operations in these critical areas, so that even if there is a slight process deviation, it is not easy to cause defects. This layered design allows different strategies or parameters to be used for different density areas in the manufacturing process, thereby achieving more fine-grained control and optimization of the overall manufacturing process.

[0078] Figure 11 Another partial schematic view of the display panel provided by the embodiment of the present disclosure is shown. Please refer to Figure 11 When the arrangement density of the first sub-assist portions 121 is less than that of the second sub-assist portions 122, in an optional embodiment of the present disclosure, the first sub-assist portions 121 and the second sub-assist portions 122 have the same area, and the number of the first sub-assist portions 121 is less than the number of the second sub-assist portions 122.

[0079] When the areas of the individual auxiliary portions 12 are the same, the arrangement density of the first sub-auxiliary portions 121 being less than that of the second sub-auxiliary portions 122 is directly achieved by the number of the first sub-auxiliary portions 121 being less than that of the second sub-auxiliary portions 122. In this way, the auxiliary portions 12 (first sub-auxiliary portions 121) close to the display area AA are more sparse, forming a buffer area with weaker stress release; and the auxiliary portions 12 (second sub-auxiliary portions 122) away from the display area AA are more dense, forming an active area with stronger stress release. This design helps to achieve smooth stress transition from the display area AA to the outside of the non-display area NA. There are fewer stress release points close to the display area AA, avoiding sudden and excessive release of stress at the critical boundary, thereby reducing the risk of boundary wrinkles and deformation of the display area AA. At the same time, the area away from the display area AA can effectively absorb and disperse the accumulated internal stress of the panel.

[0080] When the areas of the first sub-auxiliary portions 121 and the second sub-auxiliary portions 122 are the same, only one set of basic mask patterns for the individual auxiliary portions 12 is needed in the process of lithography and evaporation / etching. Whether it is the first sub-auxiliary portion 121 or the second sub-auxiliary portion 122, their formation at the microscopic level follows the same geometric rules. This unified microscopic pattern design greatly simplifies the manufacturing process. The equipment does not need to switch different patterns or adjust parameters when processing auxiliary portions 12 in different areas. The process flow is more standardized, improving production efficiency and automation level.

[0081] In addition, in the area close to the display area AA, due to the smaller number of first sub-auxiliary portions 121, the overall proportion of conductive material is reduced, so the parasitic capacitance and resistance effect of this area may be smaller, which is beneficial to improve the integrity of the display signal and the electrical performance. Therefore, the reduction of the number of first sub-auxiliary portions 121 directly reduces the probability of accidental short circuit at the edge of the most critical display area AA.

[0082] Figure 12 Another partial schematic view of the display panel provided by the embodiment of the present disclosure is shown. Please refer to Figure 12 In an optional embodiment of the present disclosure, the number of the first sub-auxiliary portions 121 and the second sub-auxiliary portions 122 is the same, and the area of the first sub-auxiliary portions 121 is smaller than that of the second sub-auxiliary portions 122.

[0083] Since the area of the first sub auxiliary portion 121 is smaller than the area of the second sub auxiliary portion 122, and the number of the first sub auxiliary portion 121 is the same as that of the second sub auxiliary portion 122, the total area of the first sub auxiliary portion 121 in the region close to the display area AA is small, and the arrangement density of the auxiliary portion 12 in this region is low. A relatively "soft" stress release buffer region can be formed in this way. This design helps to achieve a smooth stress transition from the display area AA to the outside of the non-display area NA. The stress release point (or stress absorption capacity) close to the display area AA is relatively weak, which can avoid excessive local stress concentration at the critical boundary, thereby reducing the risk of wrinkles and deformation. On the contrary, the second sub auxiliary portion 122 far away from the display area AA has a larger area, so that the total area of this region is higher, thereby forming a higher arrangement density, which can more strongly absorb and disperse the accumulated internal stress of the panel, and further protect the display area AA from being affected.

[0084] Moreover, the first sub auxiliary portion 121 close to the display area AA has a smaller area, so that the contact area of the first auxiliary portion 12 with the surrounding circuit or substrate is reduced. This helps to reduce the parasitic capacitance and resistance effect near the boundary of the display area AA, thereby improving the integrity and electrical performance of the display signal. The smaller area of the first auxiliary portion 12 also means that the probability of accidental short circuit of the conductive auxiliary portion 12 at the most critical edge of the display area AA is lower, because its physical size is smaller, and the gap with the adjacent structure is relatively larger, thereby improving the reliability of the product.

[0085] Figure 13 The cross-sectional view of the display panel is shown in FIG. 6. Please refer to Figure 1 The cross-sectional view of the display panel is shown in FIG. 6. Please refer to Figure 13 In an optional embodiment of the present disclosure, the array layer 01 includes a first pad P1 and a second pad P2 disposed towards the light emitting element D0, the first pad P1 is electrically connected to the first electrode J1 of the light emitting element D0 through a connection portion 11, and the second pad P2 is electrically connected to the second electrode J2 of the light emitting element D0 through another connection portion 11; the second pad P2 is connected to the common voltage signal line X0; at least part of the common voltage signal line X0 is electrically connected to the auxiliary portion 12.

[0086] The common voltage signal line X0 usually carries a large current in the display panel. By electrically connecting the auxiliary part 12 with the partial common voltage signal line X0, the effective conductive cross section of the common voltage signal line X0 is actually increased. A larger conductive cross section means a lower line resistance, thereby reducing the voltage drop (IR drop) and ensuring that the light emitting element receives a more stable and uniform common voltage signal. For a self-luminous device such as a Micro LED that requires precise current control, a stable and uniform common voltage signal helps to improve display uniformity and color accuracy. Especially in large-size or high-brightness panels, the common voltage signal line X0 may need to carry a large transient or continuous current. The addition of the auxiliary part 12 can significantly enhance its current carrying capacity and avoid line burning or performance degradation due to current overload. The auxiliary part 12 with a larger area connected with the common voltage signal line X0 can also improve the anti-interference ability of the signal line and reduce the influence of high-frequency noise on signal integrity.

[0087] In addition, in the present embodiment, the auxiliary part 12 of the non-display area NA originally mainly used for stress management is reused for the electrical function of the common voltage signal line X0. This reuse design avoids separately arranging a wide trace or additional conductive structure for the common voltage signal line X0, thereby saving valuable non-display area NA space. By reusing the auxiliary part 12, the wiring space inside the bezel can be further compressed without sacrificing electrical performance, providing a structural basis for achieving an ultra-narrow bezel.

[0088] If the auxiliary part 12 is made of a metal material with good thermal conductivity and has a relatively large area, it can not only carry current but also serve as an additional heat dissipation path, helping to guide the heat generated by the light emitting element D0 during operation to the non-display area NA, thereby improving the heat dissipation performance of the panel and improving the life and stability of the light emitting element D0.

[0089] Figure 14 A relative position relationship diagram of the common voltage signal line X0 and the auxiliary part 12 in the non-display area NA is shown. Please refer to Figure 14 In an optional embodiment of the present disclosure, the common voltage signal line X0 is electrically connected with a plurality of different auxiliary parts 12. Optionally, when the width of the common voltage signal line X0 in the non-display area is relatively large, a plurality of openings can be formed on the common voltage signal line X0 to reduce the coupling area between the common voltage signal line X0 and other signal lines and reduce the parasitic capacitance. At the same time, the openings can also release the internal stress when forming a large-area common voltage signal line X0, reduce the risk of panel bending or deformation, and improve the manufacturing yield.

[0090] In this embodiment, the common voltage signal line X0 is connected to multiple different auxiliary parts 12, which is equivalent to forming multiple parallel conductive paths in the entire non-display area NA. This greatly increases the effective conductive cross-sectional area of the common voltage signal line X0. More connection points mean that current can flow in or out from multiple paths, making the distribution of current in the entire common voltage network more uniform. This can effectively reduce the problem of excessive local current density, thereby reducing the voltage drop caused by current concentration. In a Micro LED display panel, uniform voltage supply is crucial for the uniformity of pixel brightness and color. By electrically connecting with multiple different auxiliary parts 12, reducing the voltage drop on the common voltage signal line X0, it is beneficial to ensure that all light emitting elements (especially elements far from the power input end) can obtain stable and same common voltage, thereby significantly improving the consistency and visual effect of the display picture.

[0091] If these auxiliary parts 12 are conductive and heat-conductive metal structures, connecting the common voltage signal line X0 to multiple such auxiliary parts 12 can form a more extensive and uniform heat dissipation network throughout the non-display area NA. This will help to more effectively conduct the heat generated by the light emitting elements D0 during operation from the edge of the display area AA to the non-display area NA, and dissipate outward through the auxiliary parts 12, thereby reducing the local temperature of the panel and prolonging the service life of the light emitting elements D0 and the overall stability of the panel.

[0092] Please refer to Figure 13 and Figure 14 In an optional embodiment of the present disclosure, the common voltage signal line X0 is in direct contact with the auxiliary part 12. The way of direct contact forming electrical connection means that there is no additional solder, conductive glue or other connectors between the common voltage signal line X0 and the auxiliary part 12, and they are physically closely connected. The intermediate connection medium (such as solder, conductive glue) often introduces additional contact resistance, which will increase the IR Drop (voltage drop) and may generate heat. Direct contact between the common voltage signal line X0 and the auxiliary part 12 eliminates these intermediate links, ensuring the lowest equivalent resistance between the common voltage signal line X0 and the auxiliary part 12. Lower resistance and more direct connection path help to minimize signal loss and voltage fluctuation, ensuring the uniformity and stability of the common voltage signal throughout the display panel, which is crucial for the brightness consistency and color performance of Micro LED. In addition, when the common voltage signal line X0 is in direct contact with the auxiliary part 12, the maximum effective conductive area is provided, which enables it to carry large current more effectively without generating excessive heat or voltage drop at the connection.

[0093] Please continue to refer to Figure 6 and Figure 13In an optional embodiment of the present disclosure, the light emitting element D0 includes electrodes J1 and J2, and the array layer 01 includes pads P1 and P2 electrically connected to the light emitting element D0; in the direction perpendicular to the light emitting surface of the display panel, the connecting part 11 in the bonding layer 10 is located between the pads and the electrodes of the light emitting element D0 in the array layer 01, and is in contact with the pads and the electrodes respectively, that is, the connecting part 11 serves as an electrical connection bridge between the pads and the electrodes. The bonding layer 10 (such as gold-tin alloy) forms a liquid alloy after heating, solidifies after cooling, realizes effective electrical connection of the pads and the electrodes, and the connecting part 11 fills the area between the electrodes and the pads, which is conducive to forming a low-resistance ohmic contact, ensuring that the current is efficiently transmitted from the array layer 01 to the light emitting element D0, and minimizing energy loss and voltage drop. Moreover, the precise vertical connection of the connecting part 11 helps to uniformly inject current into the light emitting element D0, thereby improving the light emitting efficiency and brightness uniformity of the Micro LED.

[0094] In addition, after the connecting part 11 in the bonding layer 10 solidifies between the pads and the electrodes, it can provide strong mechanical fixing force to firmly bond the tiny light emitting element D0 on the array layer 01, preventing it from falling off or shifting due to vibration, impact or thermal stress during subsequent manufacturing, packaging or use. Especially in the eutectic bonding process, the liquid connecting layer can effectively fill the tiny gap or surface unevenness between the pads and the electrodes, ensuring maximum contact area and thereby improving the reliability and stability of the bonding. The bonding layer 10 material may have certain plasticity or toughness after solidification, which can act as a microscopic stress buffer layer to absorb the local stress between the light emitting element D0 and the array layer 01 due to the mismatch of the material thermal expansion coefficients, thereby preventing the light emitting element D0 from cracking or connection failure.

[0095] The interlayer position and contact relationship of the light emitting element D0 and the array layer 01 makes the transferred light emitting element D0 fall accurately above the pads, and then be reliably bonded through the connecting part 11. The connecting part 11 as an intermediate layer simplifies the structural requirements for the transfer device. Uniform and controllable connecting part 11 helps to ensure that each transferred light emitting element D0 can be successfully and reliably bonded, thereby improving the yield of mass transfer.

[0096] Please refer to Figure 1 In an optional embodiment of the present disclosure, the display panel further includes an alignment mark S arranged in the non-display area NA, and at least part of the auxiliary part 12 is multiplexed as the alignment mark S.

[0097] In the multiple precision manufacturing steps of the Micro LED display panel, such as mass transfer, bonding, and photolithography, alignment marks are indispensable. They serve as reference points for machine vision systems or alignment tools to accurately identify the position and orientation of the substrate or chip. Multiplexing the auxiliary part 12 as an alignment mark means that these ready-made, regularly arranged structures can be directly recognized and utilized by machines without the need for additional specialized alignment mark patterns. This can significantly shorten the alignment time and improve the production line's pace. As a functional structure, the auxiliary part 12 is usually made by high-precision photolithography and evaporation / etching processes, with high dimensional stability and edge clarity, making it ideal for reuse as an alignment mark. Precise alignment helps ensure the correct placement of light-emitting elements D0 and the precise alignment between layers, thereby improving the yield of mass transfer and the success rate of subsequent processes.

[0098] In some other embodiments of the present disclosure, the auxiliary part 12, which not only bears stress management but also serves as part of the common voltage signal line, can be multiplexed as an alignment mark in the space-limited non-display area NA, avoiding the need to allocate space and create structures for alignment marks alone. This is crucial for achieving an ultra-narrow bezel design. Eliminating specialized alignment mark structures makes the panel design more concise and efficient. Without the need to design and manufacture specialized alignment mark masks and corresponding photolithography steps, manufacturing costs are directly reduced. Reducing the number of process steps and types of tools makes the entire manufacturing process smoother and more efficient. Reducing potential sources of manufacturing errors while improving alignment accuracy improves the overall product yield.

[0099] Based on the same inventive concept, the present disclosure also provides a display device, Figure 15 The display device 200 provided by the embodiment of the present disclosure is shown as a structural schematic diagram, please refer to Figure 15 The display device 200 includes the display panel 100 in any of the above embodiments. The display device 200 provided by the embodiment of the present disclosure can be a touch display screen, a mobile phone, a tablet computer, a notebook computer, an electronic paper, or a television, etc. Any electronic device with display function. The display device 200 provided by the embodiment of the present disclosure has the beneficial effects of the display panel provided by the embodiment of the present disclosure. For specific description of the display panel, please refer to the specific description of the display panel in the above embodiments, which will not be repeated here.

[0100] It can be understood that, Figure 15 Only a rectangular structure is taken as an example to illustrate one shape of the display device 200. In some other embodiments of the present disclosure, the display device 200 can also be circular, elliptical, or any other feasible shape, which is not limited in the present disclosure.

[0101] In summary, the display panel and display device provided by the embodiments of the present disclosure at least achieve the following technical effects:

[0102] In the display panel and display device provided by the embodiments of the present disclosure, the auxiliary parts in the bonding layer are arranged in multiple numbers, and at least part of the auxiliary parts are arranged in a spaced-apart manner in the non-display area, and the non-continuous full-area layer. When the bonding layer in the non-display area is designed in such a dispersed patterning manner, it is equivalent to decomposing a large-area continuous film into multiple independent small structures, which can effectively limit the stress accumulation range within each independent small area. The total amount of stress accumulation in each small area is much smaller than that of the whole film, and therefore the critical stress causing wrinkles is not easily reached. Moreover, after patterning the bonding layer in the non-display area, the total number of film edges of the auxiliary parts is increased, and the increase in the film edges provides more free surfaces, which can serve as stress release channels. When stress accumulates in a small auxiliary part, it can more easily diffuse outward through the edge of the auxiliary part or release through slight local deformation, rather than accumulating to a sufficient extent to cause large-area wrinkles. Thus, the problem of the connection part in the display area being deviated due to wrinkles caused by relatively large stress in the related art is effectively improved, thereby facilitating the improvement of the precision of subsequent processes, such as the alignment precision of the mass transfer and the connection accuracy and reliability of the light-emitting element and the array layer.

[0103] In addition, the spaced-apart arrangement of the auxiliary parts may, to some extent, change the local heat dissipation path, which is helpful for more uniform heating and cooling, thereby further controlling the stress formation and release in the bonding process. Since wrinkles and stress concentration are important reasons for the displacement of light-emitting elements, electrical connection failure or short circuit, the introduction of the spaced-apart auxiliary parts directly reduces the defect rate in the manufacturing process by alleviating these problems, thereby improving the overall yield of the display panel. Moreover, the spaced-apart arrangement of the auxiliary parts relieves the residual stress inside the panel, which is helpful for improving the stability and life of the display panel under long-term work (especially heating) and environmental changes (such as temperature cycling), and avoids the performance degradation or structural damage caused by stress release in the later stage.

[0104] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0105] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized in that: include: Array layer, bonding layer and light emitting element; The display panel includes a display area and a non-display area that at least partially surrounds the display area. The bonding layer includes a plurality of connecting parts located in the display area and a plurality of auxiliary parts located in the non-display area. The light-emitting elements are electrically connected to the array layer through the connecting parts, and at least some of the auxiliary parts are arranged at intervals.

2. The display panel according to claim 1, wherein: The minimum distance between the auxiliary portion and the connecting portion is greater than 0.

3. The display panel according to claim 2, wherein: The display area includes a plurality of pixel units arranged in an array, each pixel unit including at least two light-emitting elements; along a first direction, a minimum distance between corresponding connecting portions of adjacent pixel units is S1, and along a second direction, a minimum distance between corresponding connecting portions of adjacent pixel units is S2; the first direction and the second direction intersect; Along the first direction, the minimum distance between the auxiliary portion and the connecting portion is A1, and along the second direction, the minimum distance between the auxiliary portion and the connecting portion is A2, wherein A1≥S1, and / or A2≥S2.

4. The display panel according to claim 1, wherein: Along a direction perpendicular to the plane where the display panel is located, projections of the light-emitting element and the auxiliary portion do not overlap.

5. The display panel according to claim 1, wherein: The non-display area includes a plurality of auxiliary units, each of which includes at least one auxiliary portion. Among the plurality of auxiliary units arranged in the same direction, a distance between two adjacent auxiliary units is equal.

6. The display panel according to claim 5, wherein: The display panel includes a first non-display area extending along a first direction and a second non-display area extending along a second direction, and the first direction and the second direction intersect; in the first non-display area, the distance between the auxiliary units adjacent along the first direction is equal to the distance between the auxiliary units adjacent along the second direction in the second non-display area.

7. The display panel according to claim 6, wherein: One of the auxiliary units includes one of the auxiliary parts, and an area of ​​the auxiliary part is larger than an area of ​​the connecting part.

8. The display panel according to claim 6, wherein: A width of the auxiliary portion in the first non-display area along the first direction is greater than a width of the auxiliary portion in the second non-display area along the first direction.

9. The display panel according to claim 6, wherein: A width of the auxiliary portion in the first non-display area along the second direction is equal to a width of the auxiliary portion in the second non-display area along the second direction.

10. The display panel according to claim 1, wherein The display area includes a plurality of pixel units arrayed along a first direction and a second direction, one pixel unit includes m connecting portions, and the first direction and the second direction intersect; the non-display area includes a first non-display area extending along the first direction, the first non-display area includes a plurality of first auxiliary units arranged along the first direction, one first auxiliary unit includes n auxiliary portions, where m=n.

11. The display panel according to claim 10, wherein: The display area includes a plurality of pixel column groups arranged along the first direction, and the pixel column groups include a plurality of pixel units arranged along the second direction. The first auxiliary unit is disposed corresponding to the pixel column groups and located in the extending direction of the pixel column groups.

12. The display panel according to claim 10, wherein: The distance between the first auxiliary units adjacent to each other along the first direction is equal to the distance between the pixel units adjacent to each other along the first direction.

13. The display panel according to claim 10, wherein: The distance between the pixel units adjacent to each other along the second direction is equal to the distance between the first auxiliary unit and the pixel unit adjacent to each other along the second direction.

14. The display panel according to claim 10, wherein: The distance between the auxiliary parts adjacent along the first direction in the first auxiliary unit is equal to the distance between the connecting parts adjacent along the first direction in the pixel unit; the distance between the auxiliary parts adjacent along the second direction in the first auxiliary unit is equal to the distance between the connecting parts adjacent along the second direction in the pixel unit.

15. The display panel according to claim 10, wherein: The auxiliary portion in the first non-display area and the connecting portion in the display area have the same shape and area.

16. The display panel according to claim 10, wherein: The non-display area includes a second non-display area extending along the second direction, the second non-display area includes a plurality of second auxiliary units arranged along the second direction, and the second auxiliary unit includes p auxiliary portions, where p<n.

17. The display panel according to claim 1, wherein: The auxiliary portion includes a first sub-auxiliary portion and a second sub-auxiliary portion, the first sub-auxiliary portion is located between the second sub-auxiliary portion and the display area, and an arrangement density of the first sub-auxiliary portion is smaller than an arrangement density of the second sub-auxiliary portion.

18. The display panel according to claim 17, wherein: The first sub-auxiliary parts and the second sub-auxiliary parts have the same area, and the number of the first sub-auxiliary parts is smaller than the number of the second sub-auxiliary parts.

19. The display panel according to claim 17, wherein: The number of the first sub-auxiliary parts and the second sub-auxiliary parts is the same, and the area of ​​the first sub-auxiliary parts is smaller than that of the second sub-auxiliary parts.

20. The display panel according to claim 1, wherein The array layer includes a first pad and a second pad arranged toward the light-emitting element, the first pad being electrically connected to the first electrode of the light-emitting element through the connecting portion, and the second pad being electrically connected to the second electrode of the light-emitting element through another connecting portion; the second pad being connected to a common voltage signal line; and at least part of the common voltage signal line being electrically connected to the auxiliary portion.

21. The display panel according to claim 20, wherein: The common voltage signal line is electrically connected to a plurality of different auxiliary parts.

22. The display panel according to claim 20, wherein: The common voltage signal line is in direct contact with the auxiliary portion.

23. The display panel according to claim 1, wherein The light-emitting element includes an electrode, and the array layer includes a pad electrically connected to the light-emitting element; along a direction perpendicular to the light-emitting surface of the display panel, the connecting portion in the bonding layer is located between the pad in the array layer and the electrode of the light-emitting element, and is in contact with the pad and the electrode respectively.

24. The display panel according to claim 1, wherein The display panel further includes an alignment mark disposed in the non-display area, and at least a portion of the auxiliary portion is reused as the alignment mark.

25. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 24.

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