Display panel, preparation method thereof and display device

Abstract

Embodiments of the present application provide a display panel, a preparation method thereof and a display device. The display panel comprises: a substrate comprising a first surface, a second surface and a side surface; a light-emitting layer; a connecting layer covering the first surface and the light-emitting layer; and a protective layer arranged around the substrate and the connecting layer, wherein the protective layer comprises a first protective portion and a second protective portion, the second protective portion is located on a side of the first protective portion away from the light-emitting layer; the first protective portion is in contact with the connecting layer at least, and a projection of the first protective portion along a first direction intersects with a projection of the connecting layer along the first direction; a projection of the second protective portion along a second direction is located on the side surface at least, and at least part of the second protective portion is in contact with a side of the first protective portion away from the light-emitting layer. The display panel provided by the first aspect of the present application can block the water vapor invasion path, effectively reduce the risk of water vapor invasion, and improve the reliability of the display panel.

Description

Technical Field

[0001] This application relates to the field of display device technology, specifically to a display panel and its manufacturing method, and a display device. Background Technology

[0002] Public Information Displays (PIDs) often employ splicing displays and side wiring technology. The sides of PIDs are encapsulated using pad printing to transfer ink layers, while the front is encapsulated using pressure-sensitive adhesive (PSA) or optically clear adhesive (OCA).

[0003] However, the side-sealing ink is too thin, and the uneven interface before pad printing leads to uneven thickness of the ink layer in some areas after pad printing, resulting in cracks. In addition, the ink layer itself is not very effective at protecting against moisture. Combined with the fact that the edges of PSA or OCA tend to shrink inward after molding, forming cavities on the side, leaving a path for moisture intrusion. Summary of the Invention

[0004] This application provides a display panel and its manufacturing method, as well as a display device, which can block the path of water vapor intrusion and effectively reduce the risk of water vapor intrusion.

[0005] According to an embodiment of this application, a display panel is provided, comprising: a substrate, including a first surface, a second surface, and a side surface, wherein the first surface and the second surface are disposed opposite to each other along a first direction, and the side surface is bent and connected to the first surface and the second surface; a light-emitting layer located on the side of the first surface away from the second surface; a connecting layer located on the side of the light-emitting layer away from the substrate, and the connecting layer covers the first surface and the light-emitting layer; and a protective layer disposed around the substrate and the connecting layer, wherein the protective layer includes a first protective portion and a second protective portion, the second protective portion being located on the side of the first protective portion away from the light-emitting layer; wherein the first protective portion is at least in contact with the connecting layer, and the orthographic projection of the first protective portion along the first direction overlaps with the orthographic projection of the connecting layer along the first direction, the orthographic projection of the second protective portion along the second direction is at least located on the side surface, and at least a portion of the second protective portion is in contact with the side of the first protective portion away from the light-emitting layer, and the first direction and the second direction intersect.

[0006] The display panel provided in the first aspect of this application has a first protective portion in the protective layer that contacts the connecting layer and overlaps with it in orthographic projection along the first direction, thus filling the recess in the connecting layer and blocking part of the path for water and oxygen intrusion. At the same time, the second protective portion contacts the side of the first protective portion away from the light-emitting layer, and the second protective portion is supported by the first protective portion, avoiding the problem that the first protective portion is suspended at the edge recess, which would increase the probability of crack formation, and further blocking part of the path for water and oxygen intrusion. The arrangement of the first and second protective portions together improves the water and oxygen protection capability of the protective portion and improves the reliability of the display panel.

[0007] Secondly, according to embodiments of this application, a method for manufacturing a display panel is provided, comprising: A substrate is provided, the substrate including a first surface, a second surface and a side surface, the first surface and the second surface are disposed opposite to each other along a first direction, and the side surface is bent and connected to the first surface and the second surface; A light-emitting layer and a connecting layer are prepared on one side of the first surface of the substrate, and a recess is formed on the sidewall of the connecting layer. A protective layer is prepared on the side surface and the side wall surface of the connecting layer. The protective layer includes a first protective part and a second protective part. The second protective part is located on the side of the first protective part away from the light-emitting layer. The first protective part is at least in contact with the connecting layer and is filled in the recess. The orthogonal projection of the second protective part along the second direction is at least located on the side surface, and at least a portion of the second protective part is in contact with the side of the first protective part away from the light-emitting layer.

[0008] Thirdly, according to the embodiments of this application, a display device is provided, including a display panel provided in any first aspect embodiment of this application, or a display panel prepared by a method for preparing a display panel provided in any second aspect embodiment of this application. Attached Figure Description

[0009] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0010] Figure 1 This is a cross-sectional structural diagram of a display panel in related technologies; Figure 2 This is a schematic diagram of the planar structure of a display panel provided in the first aspect embodiment of this application; Figure 3 yes Figure 2 A schematic diagram of a cross-sectional structure along the AA direction; Figure 4 yes Figure 2 Another cross-sectional structure diagram along the AA direction; Figure 5 yes Figure 3 A magnified structural diagram of region B in the middle; Figure 6 yes Figure 3 Another enlarged structural diagram of region C in the middle; Figure 7 yes Figure 4 A magnified structural diagram of region D in the middle; Figure 8 yes Figure 4 Another enlarged structural diagram of region E in the middle; Figure 9 This is a schematic flowchart illustrating a method for manufacturing a display panel according to a second aspect embodiment of this application; Figure 10 This is a schematic diagram of another process steps of a method for manufacturing a display panel provided in the second aspect embodiment of this application; Figures 11a to 11b This is a schematic diagram of the process steps of a method for manufacturing a display panel according to a second aspect embodiment of this application; Figure 12 This is a schematic diagram of another process steps of a method for manufacturing a display panel provided in the second aspect embodiment of this application; Figures 13a to 13d This is a schematic diagram of another process step in a method for manufacturing a display panel provided in the second aspect of this application; Figure 14 This is a schematic diagram of the overall structure of a display device provided in the third aspect of this application.

[0011] in: 100 - Substrate; 110 - First side; 120 - Second side; 130 - Side surface; 200 - Emitting layer; 210 - Emitting surface; 300 - Connecting layer; 310 - Recess; 311 - First surface; 400 - Protective layer; 410 - First protective section; 411 - First extension section; 412 - Second extension section; 412a - First part; 412b - Second part; 413 - Main body; 420 - Second protective section; 421 - Third part; 422 - Fourth part; 423 - Fifth part; 400' - Protective material layer; 500 - Optical functional layer; 600-Buffer Layer; 700 - Precast substrate; 1000 - Display panel; 2000 - Display device; X - First direction; Y - Second direction.

[0012] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0013] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0014] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the display panel and display module of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0015] Figure 1 A cross-sectional structure of a display panel in the related art is shown.

[0016] Please see Figure 1 In related technologies, the side-sealing ink (INK) of PID (Polydigestive Processing) is typically prepared using a pad printing process. The side-sealing ink comprises two ink materials: a high-resistivity ink material located on the inner side and a low-resistivity ink material located on the outer side, distinguished by a buffer adhesive filling the side. However, the outermost low-resistivity ink itself suffers from insufficient processing capabilities, resulting in a thinner film thickness, cracks, and inadequate protection against moisture intrusion.

[0017] Meanwhile, during the PID fabrication process, after the light-emitting element transfer is completed, a light-shielding layer is used to reduce reflectivity, and then an OCA or PSA is covered on the light-shielding layer for encapsulation to isolate water and oxygen. However, after molding, the OCA or PSA will shrink inward at the edges, creating a recess that provides a path for moisture intrusion.

[0018] Because of the indentation at the edges of PSA or OCA, there is an uneven interface when low-resistivity ink is transferred to the side, resulting in uneven ink thickness in some areas after transfer printing. This can easily lead to cracks in the low-resistivity ink layer, further reducing its ability to protect against moisture intrusion.

[0019] The low-resistivity ink layer is not strong enough to protect against moisture intrusion. Combined with the recesses at the edges of OCA or PSA, it forms a complete moisture intrusion path, posing a reliability risk to the entire display panel.

[0020] In order to solve the above-mentioned technical problems and for technical considerations, the embodiments of this application provide a display panel and its preparation method and display device, which can block the water vapor intrusion path and effectively reduce the risk of water vapor intrusion.

[0021] Figure 2 This diagram illustrates a planar structure of a display panel according to an embodiment of the first aspect of this application. Figure 3 It shows Figure 2 A cross-sectional structure along the AA direction. Figure 4 It shows Figure 2 Another cross-sectional structure along the AA direction.

[0022] Please see Figures 2 to 4 In a first aspect, embodiments of this application provide a display panel, including a substrate 100, a light-emitting layer 200, a connecting layer 300, and a protective layer 400.

[0023] The substrate 100 includes a first surface 110, a second surface 120 and a side surface 130. The first surface 110 and the second surface 120 are disposed opposite to each other along a first direction X, and the side surface 130 is bent and connected to the first surface 110 and the second surface 120.

[0024] The light-emitting layer 200 is located on the side of the first surface 110 that is away from the second surface 120.

[0025] The connecting layer 300 is located on the side of the light-emitting layer 200 away from the substrate 100, and the connecting layer 300 covers the first surface 110 and the light-emitting layer 200.

[0026] The protective layer 400 is disposed around the substrate 100 and the connecting layer 300. The protective layer 400 includes a first protective portion 410 and a second protective portion 420. The second protective portion 420 is located on the side of the first protective portion 410 away from the light-emitting layer 200.

[0027] The first protective part 410 is in contact with the connecting layer 300 at least. The orthographic projection of the first protective part 410 along the first direction X overlaps with the orthographic projection of the connecting layer 300 along the first direction X. The orthographic projection of the second protective part 420 along the second direction Y is at least located on the side 130, and at least part of the second protective part 420 is in contact with the side of the first protective part 410 away from the light-emitting layer 200. The first direction X and the second direction Y intersect.

[0028] For example, the first surface 110 of the substrate 100 is the light-emitting surface 210 of the display panel, which is used to arrange the light-emitting layer 200 and other encapsulation structures for emitting light to display content; the second surface 120 is the backlight surface of the display panel, which is used to arrange the driving element that drives the light-emitting layer 200 to emit light, and the back trace that connects the driving element to the driving circuit of the display panel; the side surface 130 is bent and connected to both. The display panel provided in the first aspect embodiment of this application connects the back trace on the second surface 120 to the array line on the first surface 110 through the side trace on the side surface 130. Therefore, the side trace needs to be further coated with a protective layer 400 and other buffer protection structures for protection to avoid collision damage or direct contact short circuit with other adjacent display panels.

[0029] For example, the light-emitting layer 200 includes a light-emitting element formed by transferring a wafer onto the substrate 100, the light-emitting element including a micro-LED or a mini-LED.

[0030] After the light-emitting layer 200 is prepared, the light-shielding layer is prepared at a height lower than the light-emitting surface 210 of the light-emitting layer 200 to reduce reflection. Then, a film layer is prepared on the entire surface above the light-emitting layer 200 to encapsulate and isolate water and oxygen. The connecting layer 300 covers the first surface 110 and the light-emitting layer 200, and the connecting layer 300 provides a basis for further connection for the subsequent arrangement of other functional film layers.

[0031] Based on the established environment of substrate 100, light-emitting layer 200, and connecting layer 300, a protective layer 400 is arranged on one side 130 of substrate 100. The protective layer 400 includes two layers: a first protective part 410 and a second protective part 420. The two work together to improve the reliability of the display panel. The first protective part 410 in the protective layer 400 contacts the connecting layer 300 and overlaps with the orthographic projection along the first direction X. It should be understood that the first protective part 410 extends into the edge recess of the connecting layer 300 to block at least part of the path of water and oxygen intrusion, thereby improving the protection against water and oxygen intrusion.

[0032] Meanwhile, the second protective part 420 in the protective layer 400 is on the side of the first protective part 410 away from the light-emitting layer 200 and is in contact with the first protective part 410. While completing the encapsulation of the side 130 of the substrate 100, the second protective part 420 provides support at the edge recess of the connecting layer 300, reducing the risk of increased cracks due to the second protective part 420 being suspended at the edge of the connecting layer 300.

[0033] Please refer to Figure 3 and Figure 4The direction away from the light-emitting layer 200 should be understood as the direction away from the side of the light-emitting layer 200 of the display panel, that is, the edge of the display panel, and should not be understood as including the direction away from the light-emitting layer 200 of other adjacent display panels after multiple display panels are spliced ​​together.

[0034] For example, the first direction X includes a direction perpendicular to the plane where the display panel is located.

[0035] For example, the second direction Y includes a direction parallel to the plane where the display panel is located.

[0036] The display panel provided in the first aspect embodiment of this application has a first protective portion 410 in the protective layer 400 that contacts the connecting layer 300 and overlaps with it in the orthographic projection along the first direction X. This portion can fill the recess in the connecting layer 300, blocking part of the path for water and oxygen intrusion. At the same time, the second protective portion 420 contacts the side of the first protective portion 410 away from the light-emitting layer 200. The second protective portion 420 is supported by the first protective portion 410, avoiding the problem that the first protective portion 410 is suspended at the edge recess, which would increase the probability of crack formation. This further blocks part of the path for water and oxygen intrusion. The arrangement of the first protective portion 410 and the second protective portion 420 together improves the water and oxygen protection capability of the protective portion and enhances the reliability of the display panel.

[0037] Figure 5 It shows Figure 3 An enlarged structure in region B of the middle section. Figure 7 It shows Figure 4 An enlarged structure in the D region.

[0038] Please continue reading. Figure 5 and Figure 7 In some embodiments, the connecting layer 300 includes a recess 310, which is recessed by the sidewall surface of the connecting layer 300. Along the first direction X, the portion of the surface of the recess 310 that extends beyond the light-emitting surface 210 of the light-emitting layer 200 includes a first surface 311, and the first protective portion 410 at least covers the first surface 311.

[0039] After the light-emitting layer 200 is prepared and the anti-reflection treatment of the light-shielding layer is completed, a connecting layer 300 is laid on the entire surface above the light-emitting layer 200 to achieve water and oxygen isolation. Due to the characteristics of the molding process, the connecting layer 300 will form an inwardly recessed portion 310 structure near the edge sidewall of the display panel due to material shrinkage. This recess 310 extends along the first direction X, and a part of its area is higher than the light-emitting surface 210 of the light-emitting layer 200. The inner wall of the recess that exceeds the light-emitting surface 210 is the first surface 311.

[0040] The first protective portion 410 in the protective layer 400 at least covers the first surface 311. If there are unfilled cavities or bubbles in the recessed area where the first surface 311 is located, when the light-emitting layer 200 emits light normally, refraction interference will occur when the light passes through the interface between the bubble and the surrounding medium due to the difference in refractive index, which will adversely affect the uniformity of display brightness and display effect. By covering the first surface 311 with the first protective portion 410, the recess at this location can be effectively filled, potential bubbles can be eliminated, optical crosstalk problems caused by abrupt changes in refractive index can be avoided, and the normal light emission and display consistency of the light-emitting layer 200 can be guaranteed.

[0041] The light-emitting surface 210 beyond the light-emitting layer 200 should be understood as the first surface 311 located on the side of the light-emitting surface 210 away from the substrate 100 along the direction perpendicular to the plane of the display panel. The light-emitting layer 200 is the light-emitting layer 200 in its own display panel, rather than other light-emitting layers 200 in adjacent display panels after multiple display panels are spliced ​​together. When the light-emitting elements in the light-emitting layer 200 have light-emitting surfaces 210 of various heights, the light-emitting surface 210 farthest from the substrate 100 is selected as the light-emitting surface 210 of the light-emitting layer 200.

[0042] In these embodiments, the first protective part 410 at least covers the first surface 311 of the recess 310 that extends beyond the light-emitting surface, so as to prevent the presence of air bubbles at the position of the first surface 311 that are not filled by the connecting layer 300 or the first protective part 410 when the light-emitting layer 200 emits light normally. This would cause refraction interference problems at the position of the air bubbles due to the difference in refractive index, affecting the normal light emission and display effect of the light-emitting layer 200.

[0043] For example, please refer to Figure 5 In some embodiments, since the first protective part 410 is made of a material with high light transmittance, the light transmittance of the first protective part 410 is greater than that of the second protective part 420. The first protective part 410 also needs to cover the remaining surfaces of the recess 310 that are lower than the light-emitting surface 210, so as to achieve full coverage of the surface of the recess 310. This can further and comprehensively avoid the refraction interference problem caused by the difference in refractive index at the bubble position, which affects the normal light emission and display effect of the light-emitting layer 200.

[0044] The first protective layer 410, which has high light transmittance, does not inherently possess light-shielding capabilities. If unfilled air bubbles exist in other areas of the recess 310 below the light-emitting surface 210, optical interference will also occur due to differences in refractive index. By extending the first protective layer 410 to all inner wall surfaces of the recess 310, the risk of refractive interference caused by differences in refractive index at any location within the recess 310 can be eliminated. This comprehensively ensures normal light emission from the light-emitting layer 200, maintains good display performance, and simultaneously enhances the ability to block water and oxygen intrusion paths, further improving the overall reliability of the display panel.

[0045] For example, please refer to Figure 7 In some embodiments, even if the remaining surfaces of the recess 310 below the light-emitting surface 210 are not covered by the first protective part 410, since the first protective part 410 is made of a material with low light transmittance, the first protective part 410 can still block the light entering the bubble from being refracted and then continuing to be emitted into the user. Similarly, it can avoid the refraction interference problem caused by the difference in refractive index at the location of the bubble, which would affect the normal light emission and display effect of the light-emitting layer 200.

[0046] The material of the first protective part 410 itself has certain light-shielding or light-absorbing properties. In this case, even if the first protective part 410 does not extend to cover the other surfaces of the recess 310 below the light-emitting surface 210, even if there are unfilled air bubbles in the area of ​​the recess 310, the first protective part 410 can effectively block the light entering the bubble area from continuing to be emitted after refraction. This can also avoid the refraction interference caused by the difference in refractive index at the location of the bubble, so as not to affect the normal light emission of the light-emitting layer 200 and the overall display effect.

[0047] With this design, the low-transmittance first protective part 410 can block the water and oxygen intrusion path of the recess 310 while also having a local shading function. Without having to fully cover all surfaces of the recess 310, it can effectively eliminate potential optical interference risks, providing support for process flexibility under different material selection schemes, and further expanding the application range and process compatibility of the first protective part 410 material.

[0048] Please continue reading. Figure 5 and Figure 7 In some embodiments, the orthographic projection of the second protective part 420 along the second direction Y is also located on the side wall surface of the connecting layer 300, and along the first direction X, the second protective part 420 is disposed beyond the light-emitting surface 210 of the light-emitting layer 200.

[0049] During the fabrication of the display panel, the connecting layer 300 covers the light-emitting layer 200 and extends to the edge of the first surface 110 of the substrate 100. Its sidewalls are spatially adjacent to and connected with the side surface 130 of the substrate 100, together forming the side area of ​​the display panel.

[0050] In addition to its basic functions of protecting the side traces of the substrate 100 side 130 and providing electrostatic protection, the second protective part 420 extends further along the second direction Y to the side wall of the connecting layer 300. That is, the second protective part 420 not only covers the side 130 of the substrate 100, but also extends towards the side wall of the connecting layer 300, achieving a more comprehensive coverage and encapsulation of the side area.

[0051] At the same time, along the first direction X, the second protective part 420 is provided beyond the light-emitting surface 210 of the light-emitting layer 200. That is, in the direction perpendicular to the plane where the display panel is located, the coverage height of the second protective part 420 exceeds the position of the light-emitting surface 210 of the light-emitting layer 200, thereby forming an effective shielding at the edge of the light-emitting surface 210 of the light-emitting layer 200.

[0052] When multiple display panels are spliced ​​together, if there is no effective shielding when the light-emitting layer 200 between adjacent display panels emits light from the side, the light from the light-emitting unit at the edge of one display panel may enter the display area of ​​the adjacent display panel from the side, causing light crosstalk interference, resulting in uneven brightness or halo phenomenon in the spliced ​​area, which seriously affects the overall display effect and image consistency of the spliced ​​display.

[0053] By extending the second protective part 420 to cover the side wall of the connecting layer 300 and making it extend beyond the light-emitting surface 210 of the light-emitting layer 200 in the height direction, the second protective part 420 can build an effective lateral light-shielding barrier between the light-emitting layers 200 of adjacent display panels, block the propagation path of lateral light crosstalk, eliminate the light crosstalk interference problem in the splicing area, and ensure the light emission independence and display uniformity between each display panel after multi-screen splicing.

[0054] In these embodiments, the second protective part 420 not only serves to protect the side traces and provide electrostatic protection on the side 130 of the substrate 100, but also extends to the side wall of the connecting layer 300. Furthermore, the second protective part 420 extends beyond the light-emitting surface 210 of the light-emitting layer 200, further preventing cross-light interference between the light-emitting layers 200 of adjacent display panels after splicing, which would affect the display effect.

[0055] The arrangement of the second protective part 420 on the side wall of the connecting layer 300 will be explained in further detail in other first aspect embodiments of this application.

[0056] Please continue reading. Figure 5 In some embodiments, the display panel further includes an optical functional layer 500 located on the side of the connection layer 300 away from the substrate 100, and a buffer layer 600600 located between the substrate 100 and the second protective portion 420, the buffer layer being disposed around the substrate 100.

[0057] The orthographic projection of the second protective part 420 along the second direction Y is also located on the side wall of the optical functional layer 500, and the first protective part 410 is also located between the second protective part 420 and at least one of the optical functional layer 500 and the buffer layer 600.

[0058] The second protective part 420 extends further along the orthographic projection of the second direction Y to the side wall of the optical functional layer 500, thereby covering and encapsulating the side area of ​​the optical functional layer 500 and effectively blocking the potential path of water and oxygen to penetrate inward through the side wall of the optical functional layer 500.

[0059] The first protective part 410 extends further between the second protective part 420 and at least one of the optical functional layer 500 and the buffer layer 600, so that the first protective part 410 forms a continuous intermediate isolation layer between the second protective part 420 and the aforementioned functional layer. This further extends the path that water vapor needs to pass through on the basis of the original encapsulation structure, and improves the overall encapsulation structure's ability to block water and oxygen permeation.

[0060] In these embodiments, the first protective portion 410 further extends between the second protective portion 420 and at least one of the optical functional layer 500 and the buffer layer 600, further extending the moisture intrusion path and improving the reliability of the display panel.

[0061] For example, the optical functional layer 500 is a multifunctional optical film that can achieve multiple functions such as anti-glare (AG), anti-reflective (AR), and anti-fingerprint (AF) to further improve the light emission effect and enhance the user experience. In the complete structure of the display panel, the optical functional layer 500 is also provided on the side of the connecting layer 300 away from the substrate 100. As a multifunctional optical film, the optical functional layer 500 can achieve multiple functions such as anti-glare, anti-reflective, and anti-fingerprint on the light emission side, which can effectively improve the light emission effect of the display panel and enhance the touch experience and visual comfort of the user in actual use.

[0062] For example, the buffer layer 600 is a side filler adhesive, which provides an extra layer of protection for the side traces and further provides a buffering effect for collisions when multiple display panels are spliced ​​together; a buffer layer 600 is also provided around the substrate 100 between the substrate 100 and the second protective part 420. As a side filler adhesive, the buffer layer 600 provides additional physical protection for the side traces on the one hand, and on the other hand, when multiple display panels are spliced ​​and assembled, it can effectively absorb the collision force between adjacent display panels caused by installation errors or external impacts, playing a buffering and shock-absorbing role, thereby reducing the risk of damage to the side traces and packaging structure during the splicing process.

[0063] For example, the light transmittance of the first protective part 410 is greater than that of the second protective part 420. The first protective part 410 uses a transparent ink material with a mature manufacturing process, which can be directly printed on the side 130 of the substrate 100, the side wall of the connecting layer 300 and the side wall of the optical functional layer 500 to form a uniform and continuous bottom protective cover. Then, the second protective part 420 is prepared on the first protective part 410 by pad printing process, thereby naturally realizing the structural arrangement of the first protective part 410 between the second protective part 420 and the optical functional layer 500 and the buffer layer 600.

[0064] This preparation path not only solves the process bottleneck of high interface flatness requirements in pad printing, but also provides a flatter pad printing substrate for the second protective part 420 by pre-filling and covering the edge depression of the connecting layer 300 and the side wall of the buffer layer 600 with the first protective part 410, reducing the risk of uneven film thickness and cracks in the second protective part 420 due to interface unevenness.

[0065] related Figure 7 The method for fabricating the structure of the first protective part 410 and the second protective part 420 will be described in further detail in the method for fabricating the display panel provided in the embodiments of other aspects of this application.

[0066] Please continue reading. Figure 5 In some embodiments, the first protective part 410 includes a body part 413 and a first extension part 411. The first extension part 411 is located between the optical functional layer 500 and the second protective part 420. The orthographic projection of the body part 413 along the first direction X overlaps with the orthographic projection of the connecting layer 300 along the first direction X, and the body part 413 is connected to the first extension part 411.

[0067] In the side area of ​​the display panel, the connecting layer 300 covers the light-emitting layer 200 and extends to the edge of the first surface 110 of the substrate 100, and an optical functional layer 500 is stacked on top of it.

[0068] As the core component of the first protective part 410, the main body 413 overlaps with the connecting layer 300 in its orthogonal projection along the first direction X. It can penetrate deep into the edge recessed area of ​​the connecting layer 300, fill potential cavities, and block the path of water and oxygen to penetrate inward through the edge recess of the connecting layer 300.

[0069] The first extension portion 411 extends further into the area between the side wall of the optical functional layer 500 and the second protective portion 420 based on the main body portion 413. The main body portion 413 and the first extension portion 411 are connected beyond the light-emitting surface 210 of the light-emitting layer 200 and close to the optical functional layer 500, so as to achieve complete and continuous coverage of the side wall of the connecting layer 300 and the side wall of the optical functional layer 500.

[0070] On the one hand, the first extension portion 411 is located between the optical functional layer 500 and the second protective portion 420, effectively extending the path that water vapor needs to travel from one side of the optical functional layer 500 sidewall to the inside, further strengthening the water and oxygen barrier capability of the encapsulation structure in this area; on the other hand, the continuous coverage of the body portion 413 and the first extension portion 411 eliminates any unfilled areas that may remain near the optical functional layer 500, avoiding the refractive index change caused by the presence of air bubbles at this location, thus preventing refractive interference and ensuring that the light emitted by the light-emitting layer 200 in the area near the light-emitting surface 210 is emitted normally, maintaining good display visual effect.

[0071] In these embodiments, the main body 413 and the first extension 411 are connected beyond the light-emitting surface 210 of the light-emitting element and close to the optical functional layer 500, and completely cover the connecting layer 300. While extending the moisture intrusion path on the side of the optical functional layer 500, the problem of bubble refraction on the side close to the optical functional layer 500 is avoided, which affects the visual effect and improves the reliability of the display panel.

[0072] Please continue reading. Figure 5 In some embodiments, the first protective portion 410 further includes a second extension portion 412, which is disposed around the buffer layer 600 on the side of the buffer layer 600 away from the substrate 100, and the second extension portion 412 is connected to the body portion 413.

[0073] The second extension 412 includes a first part 412a and a second part 412b, which are bent and connected. The first part 412a is at least partially located between the buffer layer 600 and the second protective part 420, and the orthographic projection of the second part 412b along the first direction X is at least located on the second surface 120.

[0074] On the side of the display panel closest to the substrate 100, a buffer layer 600 is provided around the substrate 100 to provide physical protection for the side traces and absorb the impact of splicing collisions.

[0075] The second extension portion 412 is connected to the main body portion 413 on the side of the buffer layer 600 away from the substrate 100, so that the first protective portion 410 also forms a continuous and complete coverage on the side close to the substrate 100, eliminating any unfilled cavities that may exist in this area, avoiding bubble refraction interference problems on the side close to the substrate 100, and ensuring the consistency of the overall visual effect of the display panel.

[0076] The first part 412a of the second extension 412 extends between the buffer layer 600 and the second protective part 420, effectively blocking the channel through which water vapor penetrates inward through the interface between the side wall of the buffer layer 600 and the second protective part 420; the second part 412b extends in a bent direction X, and its orthographic projection covers at least the second surface 120 of the substrate 100, thereby achieving encapsulation coverage of the edge area of ​​the backlight surface of the substrate 100.

[0077] The first part 412a and the second part 412b, which are bent and connected, form a continuous protective extension in the corner area of ​​the side surface 130 and the second surface 120 of the substrate 100, further extending the detour path that moisture needs to take to bypass the buffer layer 600 and the side surface 130 of the substrate 100 and invade inward.

[0078] In these embodiments, the main body 413 and the second extension 412 are connected on the side near the substrate 100 and completely cover the connecting layer 300 and the side surface 130 and the second surface 120 of the substrate 100. The first part 412a and the second part 412b, which are bent and connected, further extend the moisture intrusion path on the side of the substrate 100, while avoiding the problem of bubble refraction on the side near the substrate 100, which affects the visual effect and improves the reliability of the display panel.

[0079] In some embodiments, the difference in refractive index between the material of the first protective part 410 and the material of the connecting layer 300 does not exceed 0.05.

[0080] The difference in refractive index between the material of the first protective layer 410 and the material of the connecting layer 300 does not exceed a preset range.

[0081] In the light emission path of the display panel, after the light is emitted from the light-emitting layer 200, it passes through the area covered by the connecting layer 300 and the first protective part 410 in sequence. If there is a significant difference in refractive index between the material of the first protective part 410 and the material of the connecting layer 300, light refraction will occur at the interface where the two come into contact, causing the emitted light to deflect and resulting in uneven brightness or halo on the light-emitting surface 210 of the display panel, which may cause abnormal visual effects such as interference with the user's normal viewing experience.

[0082] By controlling the refractive index of the material of the first protective part 410 and the refractive index of the material of the connecting layer 300 to be within a similar range, the propagation behavior of light at the interface between the two can be made to be more continuous, effectively eliminating the interface refraction effect and avoiding optical interference caused by refractive index mismatch, thereby ensuring the normal emission direction and brightness uniformity of the light from the light-emitting surface 210.

[0083] In these embodiments, the material of the first protective part 410 has a similar refractive index to the material of the connecting layer 300, which further avoids the problem of interface refraction at the contact surface between the first protective part and the connecting layer 300, thereby affecting the light emission of the light-emitting surface 210 and interfering with normal visual effects.

[0084] Figure 6 It shows Figure 3 Another enlarged structural diagram of region C.

[0085] Please see Figure 6 In some embodiments, the orthographic projection of the second protective portion 420 along the first direction X does not overlap with the orthographic projection of the second extension portion 412 along the first direction X.

[0086] Because the second protective part 420 has low light transmittance, the coverage width it occupies along the second direction Y at the edge of the display panel directly determines the width range of the visible black border at the edge of the display panel.

[0087] In applications where multiple display panels are spliced ​​together, the width of the black border between adjacent display panels is a key factor affecting the visual continuity and overall display effect of the spliced ​​display. The narrower the black border, the less noticeable the splicing gap, and the stronger the immersiveness and consistency of the displayed image.

[0088] Based on this, this embodiment limits the orthographic projection range of the second protective part 420 along the first direction X to not overlap with the orthographic projection of the second extension part 412 along the first direction X. That is, the second protective part 420 does not extend further to cover the second surface 120 of the substrate 100 where the second part 412b of the second extension part 412 is located. This narrows the coverage width of the second protective part 420 in the second direction Y to the minimum required range. Thus, while ensuring the side wiring protection function and electrostatic protection function, the black border width of the display panel edge is compressed to the lowest possible level, effectively improving the narrow bezel performance of the splicing display device.

[0089] Meanwhile, in the area where the second extension 412 second part 412b of the second extension 412 is not covered by the second protective part 420, the second extension 412 of the first protective part 410 with higher light transmittance still completely covers the area, ensuring that the water and oxygen intrusion path on the edge side of the second surface 120 of the substrate 100 is effectively blocked, and maintaining the overall water and oxygen protection capability of the packaging structure is not weakened due to the narrowing of the coverage area of ​​the second protective part 420.

[0090] The first protective portion 410, which has a high light transmittance, does not visually constitute a noticeable black border. Therefore, even if the coverage of the first protective portion 410 extends to the second surface 120 of the substrate 100, it will not adversely affect the width of the black border at the edge of the display panel.

[0091] In these embodiments, the second protective portion 420 does not extend further on the second portion 412b side of the second extension portion 412, thereby further reducing the width of the second protective portion 420 and further reducing the width of the black border at the edge of the display panel.

[0092] For example, the light transmittance of the first protective part 410 is greater than that of the second protective part 420. The width of the black border at the edge of the display panel mainly depends on the width of the second protective part 420 along the second direction Y. Therefore, when the orthographic projection of the second protective part 420 along the first direction X does not overlap with the second extension part 412, the width of the second protective part 420 is reduced to its narrowest point, which can further reduce the width of the black border at the edge of the display panel.

[0093] Please see Figure 7 In some embodiments, the display panel further includes an optical functional layer 500 located on the side of the connection layer 300 away from the substrate 100, and the orthographic projection of the second protective part 420 along the second direction Y is also located on the side wall of the optical functional layer 500. The first protective part 410 and the second protective part 420 are made of the same material, and the first protective part 410 is connected to the second protective part 420.

[0094] The first protective part 410 and the second protective part 420 are integrally molded from the same material and are structurally interconnected to form a complete package that starts from the side 130 of the substrate 100 and sequentially covers the side wall of the connecting layer 300 and the side wall of the optical functional layer 500.

[0095] The integrated structural design enables the protective layer 400 to simultaneously fill the recess 310 and cover and encapsulate the side surface 130, the side wall of the connecting layer 300, and the side wall of the optical functional layer 500 in a single manufacturing process. This effectively simplifies the manufacturing process, reduces the complexity of the process, and eliminates the potential problem of weak interface bonding between the two protective materials during layered manufacturing. This makes the overall structure of the protective layer 400 more compact and continuous, further enhancing its ability to block water and oxygen intrusion paths.

[0096] In these embodiments, the first protective portion 410 is connected to the second protective portion 420 and is sequentially distributed on the side wall of the connecting layer 300 and the side wall of the optical functional layer 500 from the side 130 of the substrate 100. They are integrally formed and simultaneously fill the recess 310 and cover the side 130, the side wall of the connecting layer 300 and the side wall of the optical functional layer 500, simplifying the process and improving the reliability of the display panel.

[0097] For example, the second protective portion 420 located on the side of the optical functional layer 500 and the side of the substrate 100 side 130 is connected to the first protective portion 410. Therefore, at least a portion of the second protective portion 420 extends to the connecting layer 300, and its orthogonal projection in the second direction Y also overlaps with the connecting layer 300.

[0098] The second protective portion 420 located on one side of the optical functional layer 500 and on one side of the substrate 100 side 130 are connected through the first protective portion 410, so that at least part of the second protective portion 420 extends to the area of ​​the connecting layer 300, and its orthographic projection along the second direction Y overlaps with the connecting layer 300, further strengthening the encapsulation coverage of the edge area of ​​the connecting layer 300 and improving the overall reliability and process manufacturing efficiency of the side encapsulation structure of the display panel.

[0099] Please continue reading. Figure 7 In some embodiments, the second protective portion 420 includes a third portion 421 and a fourth portion 422. The orthographic projection of the third portion 421 along the second direction Y is located on the side wall of the optical functional layer 500, and the orthographic projection of the fourth portion 422 along the second direction Y is located at least on the side 130. The third portion 421 is connected to the side of the first protective portion 410 away from the substrate 100, and the fourth portion 422 is connected to the side of the first protective portion 410 near the substrate 100.

[0100] The difference in height between the surface of the first protective part 410 away from the light-emitting layer 200 and the surfaces of the third part 421 and the fourth part 422 away from the light-emitting layer 200 shall not exceed 0.5 mm.

[0101] The second protective section 420 is further subdivided into two functional sections: the third section 421 and the fourth section 422. The third section 421 specifically covers the side wall area of ​​the optical functional layer 500 to block the water and oxygen intrusion path of the side wall of the optical functional layer 500. The fourth section 422 covers the side 130 area of ​​the substrate 100 and undertakes the functions of protecting the side traces and electrostatic protection.

[0102] Both are connected to the side of the first protective part 410 away from the substrate 100 and the side close to the substrate 100, respectively, and together they form a complete protective structure around the side area.

[0103] The step difference between the surface of the first protective part 410 away from the light-emitting layer 200 and the surfaces of the third part 421 and the fourth part 422 away from the light-emitting layer 200 is controlled within a small range, so that the overall outer surface of the protective layer 400 maintains a continuous and smooth transition, avoids stress concentration caused by local protrusions or depressions, effectively reduces the risk of cracks in the protective layer 400 in this area, ensures the reliability of the encapsulation structure, and also provides a good flat substrate for the subsequent stacking and preparation of other functional layers.

[0104] In these embodiments, the size of the protective layer 400, which consists of the first protective part 410 and the second protective part 420, changes continuously to prevent stress concentration caused by abrupt changes in thickness and to provide a flat substrate for the subsequent preparation of other film layers.

[0105] Please continue reading. Figure 7In some embodiments, the portion of the protective layer 400 that overlaps with the recess 310 when projected orthogonally along the second direction Y has a thickness dimension on the side of the protective layer 400 away from the substrate 100 along the first direction X that is smaller than the thickness dimension on the side closer to the substrate 100.

[0106] At the edge recess 310 of the connecting layer 300, since the optical functional layer 500 and the side 130 have different thicknesses along the first direction X, the amount of protective material required for the corresponding coverage also differs.

[0107] During the fabrication process, the amount of ink applied to one side of the optical functional layer 500 to form the protective layer 400 is less than the amount applied to the side 130. This results in the thickness of the protective layer 400 at the recess 310 being smaller on the side away from the substrate 100 along the first direction X than on the side closer to the substrate 100. This creates a thickness gradient distribution along the first direction X, reflecting the process characteristics of the filling material in the recess 310 being adaptively distributed according to the morphology of the recess 310. This allows the protective material to be filled more uniformly and effectively in the recess 310, reducing film defects caused by local overfilling or underfilling.

[0108] On the other hand, the protective layer 400 structure with a gradually varying thickness helps to alleviate the internal stress concentration caused by the sudden change in thickness, reduces the probability of cracks in the protective layer 400 at the recess 310 position, further enhances the water and oxygen barrier effect in the recess 310 area, and improves the overall reliability of the display panel packaging structure.

[0109] In these embodiments, the amount of ink used to prepare the first protective portion 410 on one side of the optical film layer is less than the amount of ink used to prepare the first protective portion 410 on the side 130. This results in the thickness dimension of a portion of the protective layer 400 on the side away from the substrate 100 along the first direction X at the recess 310 position being less than the thickness dimension on the side closer to the substrate 100. This allows the protective layer 400 to be adaptively distributed according to the covering structure, reducing stress concentration problems caused by abrupt changes in thickness and further improving the reliability of the display panel.

[0110] Please continue reading. Figure 7 In some embodiments, the second protective part 420 further includes a fifth part 423, which is bent and connected to the fourth part 422 on the side opposite to the third part 421, and the orthographic projection of the fifth part 423 along the first direction X is at least located on the second surface 120. The fourth part 422 and the fifth part 423 have different thicknesses.

[0111] In these embodiments, since the fourth part 422 and the fifth part 423 are prepared using different manufacturing processes, the thicknesses of the fourth part 422 and the fifth part 423 are different. This enables adaptive leveling of structures prepared using different manufacturing processes, reduces stress concentration problems caused by abrupt changes due to forced limitation of the thicknesses of the fourth part 422 and the fifth part 423, and further improves the reliability of the display panel.

[0112] After completing the encapsulation and coverage of the side 130 of the substrate 100, the connecting layer 300, and the side wall of the optical functional layer 500, the second protective part 420 further extends towards the second surface 120 of the substrate 100 through the fifth part 423. The fifth part 423 and the fourth part 422 are bent and connected at the corner of the side 130 and the second surface 120 of the substrate 100. Its orthographic projection along the first direction X covers at least the area of ​​the second surface 120 of the substrate 100, thereby realizing the encapsulation extension of the edge position of the backlight surface of the substrate 100, further blocking the potential path of water and oxygen to penetrate to the second surface 120 of the substrate 100 by bypassing the corner of the side 130 of the substrate 100, and comprehensively strengthening the water and oxygen protection capability of the backlight side of the display panel.

[0113] Since Part 422 and Part 523 are prepared using different preparation processes, they differ in film formation mechanism, material flow characteristics and process parameters, resulting in different film thicknesses.

[0114] This differentiated thickness distribution is a natural result of optimizing and adapting different manufacturing processes to the characteristics of the respective areas of the side 130 and the second side 120 of the substrate 100. This helps to achieve optimal coverage and protection performance in each area, ensures the structural continuity and film integrity at the bending connection, and further improves the reliability and process feasibility of the overall packaging structure of the display panel.

[0115] Figure 8 It shows Figure 4 Another magnified structure of region E in the middle.

[0116] Please see Figure 8 In some embodiments, the orthographic projection of the fifth portion 423 along the second direction Y is within the orthographic projection of the first protective portion 410 along the second direction Y.

[0117] In the edge encapsulation structure of the display panel, the maximum coverage width of the protective layer 400 along the second direction Y directly determines the width range of the visible black border at the edge of the display panel. Since the light transmittance of the first protective part 410 is higher than that of the second protective part 420, the first protective part 410 itself does not visually constitute an obvious light-blocking black border, while the second protective part 420, due to its lower light transmittance, has its coverage range along the second direction Y as the main factor affecting the width of the black border.

[0118] In the aforementioned embodiment, the fifth part 423 and the fourth part 422 are bent and connected and extend toward the second surface 120 of the substrate 100 to achieve encapsulation coverage of the backlight side edge region of the substrate 100.

[0119] In this embodiment, by limiting the orthographic projection range of the fifth part 423 along the second direction Y to within the orthographic projection range of the first protective part 410 along the second direction Y, that is, the coverage width of the fifth part 423 in the second direction Y does not exceed the coverage width of the first protective part 410, the fifth part 423 does not additionally increase the width of the overall structure of the protective layer 400 in the second direction Y, thereby avoiding the problem of increased black border width caused by the outward expansion of the fifth part 423.

[0120] In this arrangement, the maximum width of the overall structure of the protective layer 400 along the second direction Y is determined by the coverage of the first protective part 410. The fifth part 423 of the second protective part 420 is completely contained within the projection range of the first protective part 410. This achieves the goal of compressing the width of the black border at the edge of the display panel to the lowest possible level while retaining the water and oxygen encapsulation protection function of the fifth part 423 on the edge of the second surface 120 of the substrate 100.

[0121] For applications involving multiple display panels, this setting further reduces the width of the black border at the seam, enhancing the visual continuity of the spliced ​​image, minimizing the interference of the seam gaps on the viewing experience, and making the overall image of the spliced ​​display device more complete and smooth.

[0122] At the same time, the structural arrangement of the fifth part 423 within the projection range of the first protective part 410 also makes the overall outline of the protective layer 400 in the corner area of ​​the substrate 100 more compact, which helps to reduce the risk of interference and collision between the display panel and the adjacent display panel due to the excessively wide edge structure during splicing and installation, and improves the reliability of the display panel.

[0123] In these embodiments, the width of the black border of the display panel depends on the maximum width dimension of the overall structure of the first protective part 410 and the second protective part 420 along the second direction Y. When the width dimension of the fifth part 423 along the second direction Y does not exceed the width dimension of the first protective part 410, the width of the black border of the display panel can be further reduced, thereby improving the reliability of the display panel.

[0124] Figure 9 This illustration shows a flowchart of a method for manufacturing a display panel according to a second aspect embodiment of this application.

[0125] Please see Figure 9 Secondly, embodiments of this application provide a method for manufacturing a display panel, comprising: Step S10: Provide a substrate 100. The substrate 100 includes a first surface 110, a second surface 120 and a side surface 130. The first surface 110 and the second surface 120 are disposed opposite to each other along a first direction X. The side surface 130 is bent and connected to the first surface 110 and the second surface 120. Step S20: A light-emitting layer 200 and a connecting layer 300 are prepared on one side of the first surface 110 of the substrate 100, and a recess 310 is formed in the side wall of the connecting layer 300. Step S30: Prepare a protective layer 400 on the side surface 130 and the side wall surface of the connecting layer 300. The protective layer 400 includes a first protective part 410 and a second protective part 420. The second protective part 420 is located on the side of the first protective part 410 away from the light-emitting layer 200. The first protective part 410 is at least in contact with the connecting layer 300 and is filled in the recess 310. The orthogonal projection of the second protective part 420 along the second direction Y is at least located on the side surface 130, and at least a portion of the second protective part 420 is in contact with the side of the first protective part 410 away from the light-emitting layer 200.

[0126] The method for preparing a display panel provided in the second aspect of this application, since it is used to prepare the display panel provided in any of the first aspects of this application, has the beneficial effects of the display panel provided in any of the first aspects of this application, and will not be described again here.

[0127] Figure 10 This illustration shows another process step of a method for manufacturing a display panel according to a second aspect embodiment of this application. Figures 11a to 11b This illustration shows a schematic diagram of the process steps of a method for manufacturing a display panel according to a second aspect embodiment of this application.

[0128] Please see Figure 10 as well as Figures 11a to 11b In some embodiments, step S30 further includes: Step S31: Print the first protective part 410, the first protective part 410 is in contact with the connecting layer 300 and fills the recess 310 at least; Step S32: Transfer the second protective part 420 to the side of the first protective part 410 away from the light-emitting layer 200. At least part of the second protective part 420 is in contact with the side of the first protective part 410 away from the light-emitting layer 200. The light transmittance of the first protective part 410 is greater than that of the second protective part 420.

[0129] In step S31, the first protective part 410 is prepared directly on the side 130 and the side wall of the connecting layer 300 using a printing process. The printing process has good adaptability to complex interface morphology and can accurately fill the transparent ink material into the edge recess 310 of the connecting layer 300, thereby effectively sealing the recess 310 area. While blocking some water and oxygen intrusion paths, it fills the uneven interface formed by the recess 310, providing a continuous and flat base surface for the subsequent pad printing preparation of the second protective part 420.

[0130] In step S32, the second protective part 420 is transferred to the side of the first protective part 410 away from the light-emitting layer 200 by pad printing process, so that at least part of the second protective part 420 comes into contact with the side of the first protective part 410 away from the light-emitting layer 200.

[0131] Since the first protective part 410 has pre-filled and leveled the recess 310, the interface flatness faced by the pad printing process is improved, which effectively reduces the probability of uneven film thickness caused by local suspension or interface undulation after the second protective part 420 is pad printed, thereby reducing the risk of cracks in the second protective part 420 and ensuring the protection capability of the second protective part 420 against water and oxygen intrusion.

[0132] In these embodiments, the first protective part 410 can be directly printed on one side of the side 130, filling the recess 310 at the edge of the connecting layer 300, blocking part of the water and oxygen intrusion path, while providing a flat base for the subsequent pad printing of the second protective part 420, reducing the probability of uneven thickness and cracking problems caused by uneven surface after the pad printing of the second protective part 420.

[0133] For example, the first protective part 410 uses a transparent ink with a mature process. The light transmittance of the first protective part 410 is greater than that of the second protective part 420. The differentiated configuration of the material properties of the two allows them to perform optimally in terms of optical transmission and water and oxygen barrier functions.

[0134] For example, after the first protective part 410 and the second protective part 420 are prepared, they both need to undergo a curing and molding step. At least one of the curing methods such as photocuring and thermal curing can be selected to ensure that the material of the protective layer 400 is fully cross-linked and cured to achieve a stable and reliable encapsulation effect.

[0135] Figure 12 This illustration shows another process step of a method for manufacturing a display panel according to a second aspect embodiment of this application. Figures 13a to 13d This illustration shows another process step of a method for manufacturing a display panel according to a second aspect embodiment of this application.

[0136] Please see Figure 12 as well as Figures 13a to 13bIn some embodiments, step S30 further includes: Step S33: Prepare a protective material layer 400' on the prefabricated substrate 700; Step S34: The side of the precast substrate 700 with the protective material layer 400' is attached to the side surface 130 and the side wall of the connecting layer 300, and the protective material layer 400' at least partially fills the recess 310; Step S35: The protective material layer 400' is cured to form a protective layer 400. The portion of the protective material layer 400' that fills the recess 310 forms a first protective part 410. The portion of the protective material layer 400' whose orthogonal projection along the second direction Y is at least located on the side 130 forms a second protective part 420. Step S36: Peel the precast substrate 700 from the side surface 130 and the side wall of the connecting layer 300.

[0137] In step S33, a protective material layer 400' is first prepared on the prefabricated substrate 700. The prefabricated substrate 700 serves as a temporary carrier for the protective material layer 400', providing an operational basis for the subsequent bonding process.

[0138] In step S34, the side of the precast substrate 700 with the protective material layer 400' is bonded to the side surface 130 of the substrate 100 and the side wall of the connecting layer 300. The protective material layer 400' in the uncured state has good fluidity and can automatically fill into the edge recess 310 of the connecting layer 300 under the action of bonding pressure and its own leveling properties, so as to achieve adaptive filling of the recess 310 area and effectively eliminate potential water and oxygen intrusion paths.

[0139] In step S35, the protective material layer 400' is cured to form a structurally stable protective layer 400. The portion filling the recess 310 is cured to form the first protective part 410, and the portion that covers at least the side 130 along the second direction Y is cured to form the second protective part 420. The two are integrally formed and have a continuous structure, which eliminates the problem of weak interface bonding between the two layers of materials that may exist in the layered preparation process, and the overall encapsulation structure is more compact and reliable.

[0140] In step S36, the prefabricated substrate 700 is peeled off from the side 130 and the side wall of the connecting layer 300 to complete the final preparation of the protective layer 400.

[0141] In these embodiments, a protective material layer 400' is first prepared on the prefabricated substrate 700, and the uncured protective material layer 400' is attached to the side 130. The protective material layer 400' self-levels and fills the recess 310 at the edge of the connecting layer 300, which partially blocks the path of water and oxygen intrusion. At the same time, the first protective part 410 and the second protective part 420 can be prepared simultaneously, simplifying the process. Moreover, the first protective part 410 and the second protective part 420 are integrally formed, improving the reliability of the display panel.

[0142] Optionally, during the testing phase, various protective material layers 400' of different thicknesses can be prepared on the prefabricated substrate 700. After being attached, the filling of the recess 310 can be observed. It is acceptable if the protective material layer 400' can fill the recess 310 after leveling, and the thickness of the second protective part 420 is less than a predetermined value. Based on the thickness of the protective material layer 400' selected during the testing phase, it can then be applied to the mass production phase.

[0143] For example, before the protective material layer 400' is formed, the bonding force between the protective material layer 400' and the precast substrate 700 is greater than the bonding force between the protective material layer 400' and the side surface 130 and the connecting layer 300; after the protective material layer 400' is formed, the bonding force between the protective material layer 400' and the precast substrate 700 is less than the bonding force between the protective material layer 400' and the side surface 130 and the connecting layer 300, thus enabling the smooth peeling of the precast substrate 700 subsequently; before curing The bonding force between the protective material layer 400' and the prefabricated substrate 700 is greater than the bonding force between it and the side 130 and the connecting layer 300, so as to ensure that the protective material layer 400' is smoothly transferred with the prefabricated substrate 700 during the bonding stage; after curing, the bonding force between the protective material layer 400' and the prefabricated substrate 700 is less than the bonding force between it and the side 130 and the connecting layer 300, thereby ensuring that the prefabricated substrate 700 can be easily peeled off after curing, avoiding damage to the structure of the protective layer 400, and ensuring the integrity and encapsulation reliability of the protective layer 400.

[0144] For example, the curing and molding step of forming the first protective part 410 and the second protective part 420 can be selected from at least one of the curing methods such as photocuring and thermal curing, so as to ensure that the protective layer 400 material is fully cross-linked and cured, and to achieve a stable and reliable encapsulation effect.

[0145] Figure 14 The overall structure of a display device 2000 provided in a third aspect embodiment of this application is shown.

[0146] Please see Figure 14Thirdly, embodiments of this application provide a display device 2000, including a display panel 1000 provided in any first aspect embodiment of this application, or a display panel 1000 formed by a method for preparing a display panel provided in any second aspect embodiment of this application.

[0147] The display device 2000 provided in the third aspect embodiment of this application includes the display panel 1000 provided in any second aspect embodiment of this application, or the display panel 1000 prepared by the preparation method of the display panel provided in any second aspect embodiment of this application. Therefore, it has the beneficial effects of the display panel 1000 provided in any second aspect embodiment of this application or the preparation method of the display panel provided in any second aspect embodiment of this application, which will not be described in detail here.

[0148] The display device 2000 in this application embodiment includes, but is not limited to, mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, control consoles, and other devices with display functions.

[0149] The display device 2000 can be any device with a display function, such as mobile devices such as mobile phones, tablets, laptops, handheld computers, in-vehicle electronic devices, wearable devices, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), as well as non-mobile devices such as personal computers (PCs), televisions (TVs), ATMs, or self-service machines.

[0150] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A display panel, characterized in that, include: A substrate includes a first surface, a second surface, and a side surface, wherein the first surface and the second surface are disposed opposite to each other along a first direction, and the side surface is bent and connected to the first surface and the second surface; A light-emitting layer is located on the side of the first surface opposite to the second surface; A connecting layer is located on the side of the light-emitting layer opposite to the substrate, and the connecting layer covers the first surface and the light-emitting layer; A protective layer is disposed around the substrate and the connecting layer. The protective layer includes a first protective portion and a second protective portion, wherein the second protective portion is located on the side of the first protective portion away from the light-emitting layer. The first protective part is in contact with the connecting layer at least, and the orthographic projection of the first protective part along the first direction overlaps with the orthographic projection of the connecting layer along the first direction. The orthographic projection of the second protective part along the second direction is at least located on the side, and at least a portion of the second protective part is in contact with the side of the first protective part away from the light-emitting layer. The first direction and the second direction intersect.

2. The display panel according to claim 1, characterized in that, The connecting layer includes a recess, which is recessed by the sidewall of the connecting layer. Along the first direction, the portion of the surface of the recess that extends beyond the light-emitting surface of the light-emitting layer includes a first surface, and the first protective portion at least covers the first surface.

3. The display panel according to claim 2, characterized in that, The orthographic projection of the second protective part along the second direction is also located on the side wall of the connecting layer, and along the first direction, the second protective part is disposed beyond the light-emitting surface of the light-emitting layer.

4. The display panel according to claim 3, characterized in that, The display panel further includes an optical functional layer located on the side of the connection layer opposite to the substrate, and a buffer layer located between the substrate and the second protective portion, the buffer layer being disposed around the substrate; The orthographic projection of the second protective part along the second direction is also located on the side wall of the optical functional layer, and the first protective part is also located between the second protective part and at least one of the optical functional layer and the buffer layer.

5. The display panel according to claim 4, characterized in that, The first protective part includes a body part and a first extension part. The first extension part is located between the optical functional layer and the second protective part. The orthographic projection of the body part along the first direction overlaps with the orthographic projection of the connecting layer along the first direction, and the body part is connected to the first extension part.

6. The display panel according to claim 5, characterized in that, The first protective portion further includes a second extension portion, which is disposed around the buffer layer on the side of the buffer layer away from the substrate, and the second extension portion is connected to the body portion; The second extension includes a first part and a second part, which are bent and connected. The first part is at least partially located between the buffer layer and the second protective part, and the orthographic projection of the second part along the first direction is at least located on the second surface.

7. The display panel according to claim 6, characterized in that, The difference in refractive index between the material of the first protective part and the material of the connecting layer does not exceed 0.

05.

8. The display panel according to claim 7, characterized in that, The orthographic projection of the second protective part along the first direction does not overlap with the orthographic projection of the second extension part along the first direction.

9. The display panel according to claim 3, characterized in that, The display panel further includes an optical functional layer located on the side of the connection layer opposite to the substrate. The orthographic projection of the second protective part along the second direction is also located on the side wall of the optical functional layer. The first protective part and the second protective part are made of the same material, and the first protective part is connected to the second protective part.

10. The display panel according to claim 9, characterized in that, The second protective portion includes a third part and a fourth part. The orthographic projection of the third part along the second direction is located on the side wall of the optical functional layer. The orthographic projection of the fourth part along the second direction is located at least on the side. The third part is connected to the side of the first protective portion away from the substrate, and the fourth part is connected to the side of the first protective portion close to the substrate. The difference in height between the surface of the first protective part away from the light-emitting layer and the surfaces of the third and fourth parts away from the light-emitting layer does not exceed 0.5 mm.

11. The display panel according to claim 9, characterized in that, The portion of the protective layer that overlaps with the recess when projected orthogonally along the second direction has a thickness dimension on the side away from the substrate along the first direction that is smaller than the thickness dimension on the side closer to the substrate.

12. The display panel according to claim 10, characterized in that, The second protective part also includes a fifth part, which is bent and connected to the fourth part on the side opposite to the third part, and the orthographic projection of the fifth part along the first direction is at least located on the second surface, and the fourth part and the fifth part have different thicknesses.

13. The display panel according to claim 12, characterized in that, The orthographic projection of the fifth part along the second direction falls within the orthographic projection of the first protective part along the second direction.

14. A method for manufacturing a display panel, characterized in that, include: A substrate is provided, the substrate including a first surface, a second surface and a side surface, the first surface and the second surface being disposed opposite to each other along a first direction, and the side surface being bent and connected to the first surface and the second surface; A light-emitting layer and a connecting layer are prepared on one side of the first surface of the substrate, and a recess is formed in the sidewall of the connecting layer; A protective layer is prepared on the side surface and the sidewall surface of the connecting layer. The protective layer includes a first protective portion and a second protective portion. The second protective portion is located on the side of the first protective portion away from the light-emitting layer. The first protective portion is at least in contact with the connecting layer and is filled in the recess. The orthographic projection of the second protective portion along the second direction is at least located on the side surface, and at least a portion of the second protective portion is in contact with the side of the first protective portion away from the light-emitting layer.

15. The method for manufacturing a display panel according to claim 14, characterized in that, The step of preparing the protective layer on the side surface and the sidewall surface of the connecting layer further includes: The first protective part is printed and prepared, wherein the first protective part is at least in contact with the connecting layer and fills the recess; The second protective part is transferred to the side of the first protective part away from the light-emitting layer, and at least a portion of the second protective part is in contact with the side of the first protective part away from the light-emitting layer, and the light transmittance of the first protective part is greater than that of the second protective part.

16. The method for manufacturing a display panel according to claim 14, characterized in that, The step of preparing the protective layer on the side surface and the sidewall surface of the connecting layer further includes: Prepare a protective material layer on a prefabricated substrate; The protective material layer is prepared on one side of the prefabricated substrate and is attached to the side surface and the side wall of the connecting layer, wherein the protective material layer at least partially fills the recess. The protective material layer is cured to form the protective layer. The portion of the protective material layer filling the recess forms the first protective part, and the portion of the protective material layer whose orthogonal projection along the second direction is at least located on the side surface forms the second protective part. Peel the precast substrate from the side surface and the sidewall of the connecting layer.

17. A display device, characterized in that, It includes the display panel according to any one of claims 1 to 13, or the display panel formed by the method of making the display panel according to any one of claims 14 to 16.

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