Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises a driving substrate and a plurality of light-emitting elements located on one side of the driving substrate. The light-emitting element comprises a light-emitting element body; the light-emitting element body comprises a top light-emitting surface and a side light-emitting surface which are connected; the first protection structures cover at least part of the top light-emitting surface and part of the side light-emitting surface; and a plurality of first shading structures surrounding at least part of the light-emitting elements. By adopting the technical means, the first protection structure is arranged, so that the light-emitting element can be protected, and the light-emitting element is prevented from being damaged by etching when the first shading structure is formed by etching; meanwhile, due to the existence of the first protection structure, the first shading structure can be fully etched when the first shading structure is formed through etching, the first shading structure cannot be left on the surface of the light-emitting element, the light emitting efficiency of the light-emitting element can be guaranteed, and the display effect is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] With the development of display technology, display products are showing a diversified development trend. Micro-light emitting elements are increasingly used in display products due to their advantages of high brightness, high contrast and high reliability. When a micro-light emitting element display device is displaying, the contrast of the displayed image decreases due to the presence of ambient light and the high reflectivity of the light emitting elements and the metal traces in the backplane, affecting the user's viewing experience.

[0003] In the prior art, in order to reduce the reflection of light by the light-emitting elements and metal wirings, a shading structure is generally used for shielding. However, after the shading layer is prepared, etching the shading layer to form the shading structure will cause etching damage to the light-emitting element. In addition, if etching damage to the light-emitting element is to be avoided, there will be a problem of insufficient etching of the shading structure, and then the shading structure will remain on the light-emitting surface of the light-emitting element, affecting the light-emitting efficiency of the light-emitting element and affecting the display. Summary of the invention

[0004] In view of this, the present invention provides a display panel and a method for manufacturing the same, and a display device to solve the problem of residual shading structure, improve the light extraction efficiency of the light emitting element, and ensure the display effect.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, comprising a driving substrate and a plurality of light-emitting elements located on one side of the driving substrate; the light-emitting elements include a light-emitting element body; the light-emitting element body includes a top light-emitting surface and a side light-emitting surface connected and arranged;

[0006] A plurality of first protective structures, wherein the first protective structures cover at least a portion of the top light emitting surface and a portion of the side light emitting surface;

[0007] A plurality of first light shielding structures surround at least a portion of the light emitting element.

[0008] In a second aspect, an embodiment of the present invention provides a method for manufacturing a display panel, comprising:

[0009] Providing a drive substrate;

[0010] Transferring a plurality of light-emitting elements to one side of the driving substrate; the light-emitting elements include a light-emitting element body; the light-emitting element body includes a top light-emitting surface and a side light-emitting surface connected and arranged;

[0011] A first protective structure is prepared on a side of the light emitting element away from the driving substrate; the first protective structure covers at least a portion of the top light emitting surface and a portion of the side light emitting surface;

[0012] A first light shielding structure is prepared, wherein the first light shielding structure surrounds at least a portion of the light emitting element.

[0013] In a third aspect, an embodiment of the present invention provides a display device, comprising the display panel described in the first aspect of the embodiment of the present invention.

[0014] According to the technical solution provided by the embodiment of the present invention, after the light-emitting element is transferred to the driving substrate, at least a part of the top light-emitting surface and a part of the side light-emitting surface of the light-emitting element are covered by the first protective structure, so that the first protective structure can protect the light-emitting element and avoid etching damage to the light-emitting element when etching to form the first shading structure; at the same time, due to the existence of the first protective structure, the first shading structure can be fully etched when etching to form the first shading structure, avoiding the first shading structure from remaining on the surface of the light-emitting element, thereby ensuring the light-emitting efficiency of the light-emitting element and improving the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of a first display panel provided by an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of the first cross-sectional structure along the section line A-A';

[0017] Figure 3 for Figure 1 A schematic diagram of the second cross-sectional structure along the section line A-A';

[0018] Figure 4 A schematic diagram of the structure of a second display panel provided by an embodiment of the present invention;

[0019] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure along the section line BB';

[0020] Figure 6 A schematic structural diagram of a third display panel provided by an embodiment of the present invention;

[0021] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure along the section line C-C';

[0022] Figure 8 for Figure 1 A schematic diagram of the first cross-sectional structure along the cross-sectional line D-D';

[0023] Fig. 9 for Figure 1 A schematic diagram of the second cross-sectional structure along the section line D-D';

[0024] Fig.10 A schematic diagram of a manufacturing process of a first display panel manufacturing method provided by an embodiment of the present invention;

[0025] Fig.11 for Fig.10 The corresponding display panel manufacturing process flow chart;

[0026] Fig.12 A schematic diagram of a manufacturing process of a second method for manufacturing a display panel provided by an embodiment of the present invention;

[0027] Fig.13 for Fig.12 The corresponding display panel manufacturing process flow chart;

[0028] Fig.14 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the related art, the preparation process of the light-shielding structure is generally after the light-emitting element is transferred to the driving substrate. Specifically, the light-emitting element is first transferred to the driving substrate, and then a whole layer of light-shielding layer is prepared on the surface of the driving substrate facing the light-emitting element, and the light-shielding layer covers the light-emitting element and the metal wiring in the driving substrate; then the light-shielding layer is patterned to remove the light-shielding layer covering the top light-emitting surface of the light-emitting element, so that the light-shielding layer only covers the metal wiring in the driving substrate. However, the inventors have found that in the related art, when the light-shielding layer is patterned, it is possible to cause damage to the top light-emitting surface of the light-emitting element, affecting the light emission of the light-emitting element; and the light-shielding structure is easy to remain on the top light-emitting surface of the light-emitting element, thereby affecting the light emission efficiency of the light-emitting element, resulting in a decrease in display brightness, affecting the display effect of the display device.

[0031] Based on the defects of the above-mentioned related technologies, the present application provides a display panel, including: a driving substrate and a plurality of light-emitting elements located on one side of the driving substrate; the light-emitting elements include a light-emitting element body; the light-emitting element body includes a top light-emitting surface and a side light-emitting surface connected to each other; a plurality of first protective structures, the first protective structures covering at least part of the top light-emitting surface and part of the side light-emitting surface; a plurality of first shading structures, the first shading structures surrounding at least part of the light-emitting elements.

[0032] Through the above technical solution, after the light-emitting element is transferred to the driving substrate, the light-emitting element is protected by setting a first protective structure to avoid etching damage to the light-emitting element when etching to form the first light-shielding structure; at the same time, due to the existence of the first protective structure, the first light-shielding structure can be fully etched when etching to form the first light-shielding structure, which can avoid the problem of the first light-shielding structure remaining on the top light-emitting surface of the light-emitting element, thereby ensuring the light-emitting efficiency of the light-emitting element and improving the display effect. In addition, in the process of etching the first light-shielding structure, the first protective structure can reduce or even avoid damage to the light-emitting surface of the light-emitting element, thereby ensuring the light-emitting effect and light-emitting efficiency of the light-emitting element.

[0033] The above is the core idea of ​​the present invention. The technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Figure 1 A schematic diagram of the structure of a first display panel provided by an embodiment of the present invention, Figure 2 for Figure 1 Schematic diagram of the first cross-sectional structure along the section line A-A', Figure 3 for Figure 1 The second cross-sectional structure schematic diagram along the section line A-A'; Figure 1-Figure 3 As shown, the display panel includes: a driving substrate 1 and a plurality of light-emitting elements 2 located on one side of the driving substrate 10; the light-emitting element 2 includes a light-emitting element body 20; the light-emitting element body 20 includes a top light-emitting surface 20a and a side light-emitting surface 20b that are connected and arranged; a plurality of first protective structures 3, the first protective structures 3 cover at least part of the top light-emitting surface 20a and part of the side light-emitting surface 20b; and a plurality of first shading structures 4, the first shading structures 4 surround at least part of the light-emitting element 2.

[0035] Specifically, the driving substrate 1 may include a base substrate 101 and a driving layer disposed on one side of the base substrate 101. The base substrate 101 may be a rigid substrate or a flexible substrate, which is not limited in the embodiment of the present invention. The specific structure of the driving layer may be set according to actual needs. For example, when the driving mode of the light-emitting element 2 is active driving, the driving layer may include a driving circuit 102 and a bonding structure 103; when the driving mode of the light-emitting element 2 is passive driving, the driving layer may include a bonding structure 103. The present invention does not elaborate on or limit the setting mode of the driving layer.

[0036] Specifically, the light emitting element 2 may be a micro light emitting element 2 such as a micro light emitting diode (Micro Light Emitting Diode, MicroLED) or a sub-millimeter light emitting diode (Mini Light Emitting Diode, Mini LED). The light emitting element 2 is arranged on one side of the driving substrate 1, and the light emitting element body 20 may refer to a micro light emitting diode chip. The light emitting element body 20 may include a light emitting layer 201 and an electrode structure 202. For micro light emitting diode chips with different structures, the relative positions of the light emitting layer 201 and the electrode structure 202 may be different. In the drawings of the embodiments of the present invention, a flip chip is taken as an example, and the light emitting layer 201 may be located on the side of the electrode structure 202 away from the driving substrate 1, but it is not limited thereto. In embodiments not shown in the present invention, the light emitting element body 20 may also be a positive chip (the electrode structure 202 is located on the side of the light emitting layer 201 away from the driving substrate 1) or a vertical chip (the two electrodes are located on both sides of the light emitting layer 201 along the thickness direction of the display panel), which is not repeated or limited in the embodiments of the present invention.

[0037] Specifically, the light-emitting layer 201 is used to emit light, and the electrode structure 202 is used to be electrically connected to the driving layer in the driving substrate 1. The light-emitting element body 20 includes a top light-emitting surface 20a and a side light-emitting surface 20b that are connected and arranged. The top light-emitting surface 20a can refer to the light-emitting surface of the light-emitting element body 20 that is away from the driving substrate 1, and the side light-emitting surface 20b can refer to the connection surface between the side surface of the light-emitting element body 20 that faces the driving and the top light-emitting surface 20a. Generally, the top light-emitting surface 20a and the side light-emitting surface 20b are the main light-emitting surfaces of the light-emitting element body 20.

[0038] Specifically, after the light emitting element 2 is transferred to the driving substrate 1, a first protective structure 3 is prepared on the side of the light emitting element 2 away from the driving substrate 1, and the first protective structure 3 covers at least a portion of the top light emitting surface 20a and a portion of the side light emitting surface 20b. It is understandable that a whole protective layer can be prepared on the side of the first protective structure 3 away from the driving substrate 1, and then the first protective structure 3 is formed by patterning the protective layer. Due to process limitations, the first protective structure 3 will have a wall hanging phenomenon, that is, the first protective structure 3 will not only cover the top light emitting surface 20a, but also cover a portion of the side light emitting surface 20b.

[0039] Specifically, after the first protective structure 3 is prepared, a whole layer of shading layer is prepared on the side of the first protective structure 3 away from the driving substrate 1, and the first shading structure 4 is formed by patterning the shading layer. The first shading structure 4 can shield metal wiring such as the electrode structure 202, the driving circuit 102 and the bonding structure 103, thereby reducing metal reflection and improving the performance of the display panel. In the process of patterning the shading layer, it is necessary to remove the part covering the surface of the first protective structure 3, that is, it is necessary to remove the shading structure overlapping with the projection of the light-emitting element, so that the light emitted by the light-emitting element will not be absorbed by the first shading structure 4, which is conducive to ensuring the light emitting effect of the light-emitting element.

[0040] For details, please refer to Figure 2 and Figure 3 As shown, by setting the first protective structure 3, in the process of patterning the shading layer to form the first shading structure, the top light emitting surface 20a can be protected to avoid etching damage to the light-emitting element when etching to form the first shading structure 4; at the same time, due to the existence of the first protective structure 3, the first shading structure 4 can be fully etched when etching to form the first shading structure 4.

[0041] For details, please refer to Figure 3 In order to improve the light extraction efficiency of the light emitting element 2, the surface of the light emitting element 2 can be subjected to microstructure or roughening treatment. The light extraction angle of the light emitting element body 20 can be adjusted by microstructure or roughening treatment to avoid the total internal reflection of the light emitted by the light emitting element body 20 at the top light extraction surface 20a, thereby improving the light extraction efficiency of the light emitting element body 20. The setting of the first protective structure 3 can prevent the first light shielding structure 4 from directly contacting the microstructure. At the same time, the top surface of the first protective structure 3 is a plane, so that the etching process of the first light shielding structure 4 is simple when etching to form the first light shielding structure 4. At the same time, due to the existence of the first protective structure 3, the first light shielding structure 4 can be fully etched when etching to form the first light shielding structure 4, so as to avoid the first light shielding structure 4 from being left on the top light extraction surface 20a, thereby affecting the light extraction effect of the light emitting element, thereby ensuring the performance of the light emitting element.

[0042] It can be understood that the material of the first light-shielding structure 4 can be a material that absorbs light.

[0043] The display panel provided by the embodiment of the present invention, after the light-emitting element is transferred to the driving substrate, covers at least a portion of the top light-emitting surface and a portion of the side light-emitting surface of the light-emitting element by a first protective structure, so that the first protective structure can protect the light-emitting element and avoid etching damage to the light-emitting element when etching to form the first shading structure; at the same time, due to the existence of the first protective structure, the first shading structure can be fully etched when etching to form the first shading structure, avoiding the first shading structure from remaining on the surface of the light-emitting element, thereby ensuring the light-emitting efficiency of the light-emitting element and improving the display effect.

[0044] Optional, Figure 4 A schematic diagram of the structure of a second display panel provided by an embodiment of the present invention, Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the section line B-B', Figure 6 A schematic diagram of the structure of a third display panel provided by an embodiment of the present invention, Figure 7 for Figure 6 The schematic diagram of the cross-sectional structure along the section line C-C' is as follows: Figure 4-Figure 7 As shown, the top light emitting surface 20a includes a central light emitting area aa and an edge light emitting area bb, and the edge light emitting area bb surrounds the central light emitting area aa; the first protective structure 3 covers the central light emitting area aa; the first shading structure 4 includes a first shading portion 41, and the first shading portion 41 covers at least part of the edge light emitting area bb.

[0045] Specifically, the central light emitting area aa can be the central area of ​​the top light emitting surface 20a, and the edge light emitting area bb can be the edge area around the top light emitting surface 20a. The proportion of the central light emitting area aa in the top light emitting surface 20a is greater than the proportion of the edge light emitting area bb in the top light emitting surface 20a.

[0046] Specifically, the first protective structure 3 covers the central light emitting area aa, so that the central light emitting area aa can be protected by the first protective structure 3 to avoid etching damage to the central light emitting area aa when etching to form the first light shading structure; at the same time, due to the existence of the first protective structure 3, the first light shading structure can be fully etched when etching to form the first light shading structure, so as to prevent the first light shading structure 4 from remaining in the central light emitting area aa, which is beneficial to ensure the light emitting efficiency of the central light emitting area aa. Specifically, the first protective structure 3 covering the edge light emitting area bb can be removed by an etching process, so that at least part of the edge light emitting area bb can be exposed, and then when preparing the first light shading structure 4, the first light shading division 41 of the first light shading structure 4 can cover the exposed edge light emitting area bb, which is beneficial to reduce the reflection of external ambient light by the first light shading division 41. In addition, the first light shading division 41 can prevent crosstalk between two adjacent light emitting elements 2, thereby reducing color deviation and improving the display performance of the display panel.

[0047] Exemplarily, the first color light emitted from the first color light emitting element body to the second color light emitting element body will be absorbed by the first light shielding portion 41, and thus no crosstalk will occur.

[0048] As a feasible implementation method, continue to refer to Figure 4 and Figure 5 The first shading section 41 completely covers the edge light emitting area bb, that is, the first shading section 4 covers the surrounding positions of the upper surface of the light emitting element 2 and surrounds the first protective structure 3. This can further prevent crosstalk between two adjacent light emitting elements 2 and reduce color deviation on the one hand, and on the other hand, it is beneficial to further reduce the reflection of external ambient light and improve the display performance of the display panel.

[0049] As another possible implementation, continue to refer to Figure 6 and Figure 7 , the first light shielding sub-section 41 covers part of the edge light emitting area bb. Exemplarily, the first light shielding sub-section 41 can cover half of the edge light emitting area bb, and the first protective structure 3 can cover the remaining edge light emitting area bb, so that on the one hand, the coverage area of ​​the first protective structure 3 can be increased, which is conducive to ensuring that the light emitting area of ​​the light emitting element 2 is larger and improving the light emitting efficiency of the light emitting element 2. In addition, the first light shielding sub-section 41 can reduce the reflection of external ambient light and reduce the crosstalk between two adjacent light emitting elements 2, reduce color deviation, and thus improve the display performance of the display panel.

[0050] Exemplarily, the first light shielding portion 41 may also cover 1 / 4 or 1 / 3 of the edge light emitting area bb.

[0051] Optional, Figure 8 for Figure 1 The first cross-sectional structure schematic diagram along the cross-sectional line D-D' is as follows: Figure 8 As shown, the driving substrate 1 includes multiple main bonding structures 10 and multiple backup bonding structures 20; the light-emitting element 2 also includes an electrode structure 202 located on the side of the light-emitting element body 20 close to the driving substrate 1; the electrode structure 202 is electrically connected to the main bonding structure 10; the display panel also includes multiple second protective structures 5, and the second protective structure 5 covers at least part of the backup bonding structure 20.

[0052] Specifically, the light emitting element body 20 includes a first color light emitting element body 20R, a second color light emitting element body 20G and a third color light emitting element body 20B, and the first color light emitting element body 20R, the second color light emitting element body 20G and the third color light emitting element body 20B are micro light emitting diode chips of three different colors. Exemplarily, the first color light emitting element body 20R can be a red light emitting element body, the second color light emitting element body 20G can be a green light emitting element body, and the third color light emitting element body 20B can be a blue light emitting element body.

[0053] Specifically, the main bonding structure 10 can be understood as the main pad on the driving substrate 1. During the transportation of the light-emitting element 2, the electrode structure 202 is bonded and electrically connected to the main bonding structure 10. The spare bonding structure 20 can be understood as a spare pad on the driving substrate 1, that is, a redundant pad. When the main bonding structure 10 is damaged, the electrode structure 202 can be electrically connected to the spare bonding structure 20.

[0054] Specifically, after preparing a protective layer on the side of the light-emitting element 2 away from the driving substrate 1, the protective layer is patterned to form a first protective structure 3 and a second protective structure 5. That is, the first protective structure 3 and the second protective structure 5 are formed by the same process step, and the preparation process is simple. Among them, the first protective structure 3 covers at least part of the top light-emitting surface 20a and part of the side light-emitting surface 20b, and the second protective structure 5 covers at least part of the spare bonding structure 20. In this way, the spare bonding structure 20 and the metal wiring below it can be shielded by the second protective structure 5, thereby reducing the reflection of the metal wiring and improving the performance of the display panel.

[0055] Exemplarily, the second protection structure 5 completely covers the backup bonding structure 20 , which is helpful to increase the shielding area of ​​the metal wiring, thereby further reducing the reflection of the metal wiring and improving the performance of the display panel.

[0056] Optional, continue to refer to Figure 8 The display panel further includes a plurality of second light-shielding structures 6 , and the second light-shielding structures 6 cover the second protection structure 5 .

[0057] Specifically, the second shading structure 6 covers the second protective structure 5 , so that the second shading structure 6 can further shield the backup bonding structure 20 and the metal wiring thereunder, further reducing the reflection of the metal wiring and improving the performance of the display panel.

[0058] It should be noted that after a whole light-shielding layer is prepared on the side of the first protective structure 3 away from the driving substrate 1, the light-shielding layer is patterned to form the first light-shielding structure 4 and the second light-shielding structure 6. That is, the first light-shielding structure 4 and the second light-shielding structure 6 are formed through the same process steps, and the preparation process is simple.

[0059] Optional, continue to refer to Figure 8 The first light-shielding structure 4 includes a second light-shielding portion 42 ; the second light-shielding portion 42 covers the main bonding structure 10 , the electrode structure 202 and a portion of the side light-emitting surface 20 b ; the thickness of the second light-shielding structure 6 is greater than the thickness of the second light-shielding portion 42 .

[0060] Specifically, the second light-shielding portion 42 covers the main bonding structure 10, the electrode structure 202 and a portion of the side light-emitting surface 20b. That is, the distance between the first surface 421 of the second light-shielding portion 42 away from the driving substrate 1 and the driving substrate 1 is greater than the distance between the lower surface of the light-emitting element body 20 close to the driving substrate 1 and the driving substrate 1, which is beneficial for the second light-shielding portion 42 to shield the main bonding structure 10, the electrode structure 202 and a portion of the side light-emitting surface 20b, thereby reducing metal reflection and improving the performance of the display panel.

[0061] Specifically, since the thicker the light shielding structure is, the better the light shielding effect is, the thickness of the second light shielding structure 6 is greater than the thickness of the second light shielding section 42, that is, the thickness of the light shielding structure located on the side of the spare bonding structure 20 away from the driving substrate 1 is larger, which is beneficial to reduce the reflection of the metal wiring at the position of the spare bonding structure 20, thereby improving the performance of the display panel.

[0062] Optional, Fig. 9 for Figure 1 The second cross-sectional structure schematic diagram along the section line D-D' is as follows: Fig. 9 As shown, the second light shielding portion 42 includes a first surface 421 away from the driving substrate 1 ; the second light shielding structure 6 includes a second surface 61 away from the driving substrate 1 ; and the curvature radius of the first surface 421 is smaller than the curvature radius of the second surface 61 .

[0063] Specifically, since the smaller the radius of curvature is, the more concave the surface shape of the shading structure is. By setting the radius of curvature of the first surface 421 to be smaller than the radius of curvature of the second surface 61, it means that the first surface 421 is more concave than the second surface, and the edge height of the first surface 421 is greater than the edge height of the second surface 61, which is conducive to absorbing light with a large viewing angle, reducing color deviation, and improving the display effect of the display panel.

[0064] It should be noted that the thickness of the second shading structure 6 is greater than the thickness of the second shading section 42, and / or the curvature radius of the first surface 421 is smaller than the curvature radius of the second surface 61. This can improve the performance of the display panel on the one hand, and achieve diversified settings for the display panel on the other hand.

[0065] Optional, continue to refer to Fig. 9 The second shading structure 6 includes a second surface 61 away from the driving substrate 1; among the plurality of second shading structures 6, the maximum curvature radius of the second surface 61 is R1, and the minimum curvature radius of the second surface 61 is R2; wherein, |R2-R1| / R1≤20%.

[0066] Specifically, |R2-R1| / R1≤20%, indicating that the curvature radii of the multiple second surfaces 61 are approximately equal, that is, the degree of concavity of the second surfaces 61 at the positions of the multiple spare bonding structures 20 is approximately consistent. In this way, on the one hand, the preparation process of the second shading structure 6 is simple, and on the other hand, it can ensure that the second shading structure 6 absorbs light and reflects stray light in a consistent direction, thereby improving the performance of the display panel.

[0067] Optional, continue to refer to Figure 8 The first light-shielding structure 4 includes a second light-shielding division 42; the second light-shielding division covers the main bonding structure 10, the electrode structure 202 and a portion of the side light-emitting surface 20b; along the thickness direction of the display panel (the Z direction as shown in the figure), the height of the side light-emitting surface 20b is D1; ​​the height of the side light-emitting surface 20b covered by the second light-shielding division 42 is D2; wherein, D2 / D1≤1 / 3.

[0068] Specifically, the second shading portion 42 does not completely cover the side light emitting surface 20b, but only covers part of the side light emitting surface 20b. This is helpful to ensure that the light emitted from the side light emitting surface 20b will not be completely absorbed by the second shading portion 42, thereby ensuring the light emitting efficiency of the light emitting element 2, and achieving a wide viewing angle to enhance the display effect.

[0069] For example, when D2 / D1>1 / 3, it means that the second shading portion 42 covers more of the side light emitting surface 20b, so most of the light emitted from the side light emitting surface 20b will be absorbed by the second shading portion 42, and the light emitting efficiency of the light emitting element 2 cannot be guaranteed, and a wide viewing angle cannot be achieved.

[0070] Optional, continue to refer to Figure 2 and Figure 3 Along the thickness direction Z of the display panel, the first protective structure 3 includes a first protective surface 31 and a second protective surface 32; the first protective surface 31 is located on the side of the second protective surface 32 away from the driving substrate 1; the area of ​​the second protective surface 32 is greater than or equal to the area of ​​the first protective surface 31.

[0071] Specifically, the area of ​​the first protective surface 31 can be understood as the surface area of ​​the upper surface of the first protective structure 3, and the area of ​​the second protective surface 32 can be understood as the surface area of ​​the lower surface of the first protective structure 3; or, the area of ​​the first protective surface 31 can be understood as the projection area of ​​the upper surface of the first protective structure 3 on the light-emitting element 2, and the area of ​​the second protective surface 32 can be understood as the projection area of ​​the lower surface of the first protective structure 3 on the light-emitting element 2. The area of ​​the second protective surface 32 is greater than or equal to the area of ​​the first protective surface 31, that is, the surface area of ​​the lower surface of the first protective structure 3 is greater than or equal to the surface area of ​​the upper surface, or the projection area of ​​the lower surface on the light-emitting element is greater than or equal to the projection area of ​​the upper surface on the light-emitting element, so that the preparation process of the first protective structure 3 is simple, and in addition, the contact area between the second protective surface 32 and the top light-emitting surface 20a can be increased, so as to achieve a better protection effect on the top light-emitting surface 20a, and prevent more first light-shielding structures 4 from remaining on the top light-emitting surface 20a, affecting the light-emitting efficiency of the light-emitting element 2.

[0072] Optional, continue to refer to Figure 2 , the first protection structure 3 includes a light-transmitting organic material.

[0073] Specifically, since organic materials have good adhesion, the use of organic materials is conducive to ensuring the adhesion effect of the first protective structure 3 to the top light emitting surface 20a and the side light emitting surface 20b, thereby improving the protection performance of the light emitting element. In addition, the first protective structure 3 is made of light-transmitting material, which is conducive to ensuring the light emitting effect of the light emitting element 2.

[0074] It should be noted that the first protective structure 3 may also have yellowing resistance, which is beneficial to maintaining the optical properties of the display panel and preventing the first protective structure 3 from yellowing due to ultraviolet radiation or other environmental factors, thereby ensuring the display quality and service life of the display panel.

[0075] It should be noted that, continue to refer to Figure 8 Before preparing the first shading structure, a spacing structure 7 is also included between two adjacent light-emitting elements, which is beneficial to provide physical support for the display panel, increase the structural stability of the display panel, and prevent adhesion or damage between the light-emitting elements due to external pressure or temperature changes.

[0076] In summary, the display panel provided by the embodiment of the present invention, after the light-emitting element is transferred to the driving substrate, covers at least part of the top light-emitting surface and part of the side light-emitting surface of the light-emitting element through the first protective structure, so that the first protective structure can protect the light-emitting element and avoid etching damage to the light-emitting element when etching to form the first light-shielding structure; at the same time, due to the existence of the first protective structure, the first light-shielding structure can be fully etched when etching to form the first light-shielding structure, avoiding the first light-shielding structure from remaining on the surface of the light-emitting element, thereby ensuring the light-emitting efficiency of the light-emitting element and improving the display effect. In addition, the first protective structure covers the central light-emitting area, and the first light-shielding section covers at least part of the edge light-emitting area, which is conducive to ensuring the light-emitting efficiency of the central light-emitting area, and the first light-shielding section can reduce the reflection of external ambient light and reduce color deviation, thereby improving the display performance of the display panel.

[0077] Based on the same inventive concept, an embodiment of the present invention further provides a method for preparing a display panel. Fig.10 A schematic diagram of a manufacturing process of a first display panel manufacturing method provided by an embodiment of the present invention, Fig.11 for Fig.10 The corresponding display panel preparation process flow chart is as follows: Fig.10 and Fig.11 As shown, the method for preparing the display panel includes:

[0078] S101, providing a driving substrate.

[0079] Specifically, referring to step (a1), the driving substrate 1 may include a base substrate 101 and a driving layer disposed on one side of the base substrate 101 , and the driving layer may include a driving circuit 102 and a bonding structure 103 .

[0080] S102, transferring a plurality of light-emitting elements to one side of the driving substrate; the light-emitting elements include a light-emitting element body; the light-emitting element body includes a top light-emitting surface and a side light-emitting surface that are connected and arranged.

[0081] Specifically, referring to step (b1), the light emitting element 2 transfer process may be a mass transfer process, and the specific transfer method may refer to the prior art, which is not elaborated or limited in the embodiment of the present invention.

[0082] S103, preparing a first protective structure on a side of the light emitting element away from the driving substrate; the first protective structure covers at least a portion of the top light emitting surface and a portion of the side light emitting surface.

[0083] Specifically, referring to step (c1), after the light-emitting element 2 is transferred to the driving substrate 1, a first protective structure 3 is prepared on the side of the light-emitting element 2 away from the driving substrate 1, and the first protective structure 3 covers at least a portion of the top light-emitting surface 20a and a portion of the side light-emitting surface 20b. It is understandable that a whole protective layer can be prepared on the side of the first protective structure 3 away from the driving substrate 1, and then the first protective structure 3 is formed by patterning the protective layer. Due to process limitations, the first protective structure 3 will have a wall hanging phenomenon, that is, the first protective structure 3 will not only cover the top light-emitting surface 20a, but also cover a portion of the side light-emitting surface 20b.

[0084] Specifically, the first protective structure 3 can protect the top light emitting surface 20a, thereby preventing the light emitting element from being damaged by etching when the first light shielding structure 4 is formed; at the same time, due to the existence of the first protective structure 3, the first light shielding structure 4 can be fully etched when the first light shielding structure 4 is formed by etching. This prevents the first light shielding structure from being left on the top light emitting surface 20a, thereby affecting the light emitting effect of the light emitting element. On the other hand, it can prevent the light emitting surface of the light emitting element from being damaged during the patterning of the light shielding layer, thereby ensuring the stability of the light emitting element.

[0085] S104, preparing a first light-shielding structure, wherein the first light-shielding structure surrounds at least a portion of the light-emitting element.

[0086] Specifically, referring to step (d1), after the first protective structure 3 is prepared, a whole layer of shading layer is prepared on the side of the first protective structure 3 away from the driving substrate 1, and the first shading structure 4 is formed by patterning the shading layer. The first shading structure 4 can shield metal wiring such as the electrode structure 202, the driving circuit 102 and the bonding structure 103, thereby reducing metal reflection and improving the performance of the display panel. In the process of patterning the shading layer, it is necessary to remove the portion covering the surface of the first protective structure 3, that is, it is necessary to remove the shading structure that overlaps with the projection of the light-emitting element, so that the light emitted by the light-emitting element will not be absorbed by the first shading structure 4, which is conducive to ensuring the light-emitting effect of the light-emitting element and avoiding the light emitted by the light-emitting element from being absorbed by the first shading structure.

[0087] It should be noted that before preparing the first shading structure, a spacing structure 7 is also provided between two adjacent light-emitting elements, which is beneficial for providing physical support for the display panel, increasing the structural stability of the display panel, and preventing adhesion or damage between the light-emitting elements due to external pressure or temperature changes.

[0088] The method for preparing a display panel provided by an embodiment of the present invention provides a first protective structure to cover at least part of the top light-emitting surface and part of the side light-emitting surface of the light-emitting element after the light-emitting element is transferred, so that the first protective structure can protect the light-emitting element and avoid etching damage to the light-emitting element when etching to form the first light-shielding structure; at the same time, due to the existence of the first protective structure, the first light-shielding structure can be fully etched when etching to form the first light-shielding structure, avoiding the first light-shielding structure from remaining on the surface of the light-emitting element, thereby ensuring the light-emitting efficiency of the light-emitting element and improving the display effect. In addition, in the process of etching the first light-shielding structure, the first protective structure can reduce or even avoid damage to the light-emitting surface of the light-emitting element, thereby ensuring the light-emitting effect and light-emitting efficiency of the light-emitting element.

[0089] Optional, Fig.12 A schematic diagram of a preparation process of a second method for preparing a display panel provided in an embodiment of the present invention, Fig.13 for Fig.12 The corresponding display panel preparation process flow chart, Fig.12 and Fig.13 Based on the above embodiment, the operations of preparing the first protective structure and the first light shielding structure on the side of the light emitting element away from the driving substrate are described in detail. Fig.12 and Fig.13 As shown, the method for preparing the display panel includes:

[0090] S201, providing a driving substrate.

[0091] S202, transferring a plurality of light-emitting elements to one side of the driving substrate; the light-emitting elements include a light-emitting element body; the light-emitting element body includes a top light-emitting surface and a side light-emitting surface that are connected and arranged.

[0092] Specifically, referring to step (a2) and step (b2), the top light emitting surface 20a includes a central light emitting area aa and an edge light emitting area bb, and the edge light emitting area bb surrounds the central light emitting area aa.

[0093] S203 , preparing a protective layer on a side of the light emitting element away from the driving substrate.

[0094] Specifically, referring to step (c2), a protective layer 30 is prepared on a side of the light emitting element away from the driving substrate.

[0095] S204 , patterning the protective layer to form a first protective structure; the first protective structure covers the central light emitting area.

[0096] Specifically, referring to step (d2), the protective layer 30 is patterned through an etching process to form a first protective structure 3, and the first protective structure covers the central light emitting area aa. In this way, the central light emitting area aa can be protected by the first protective structure 3 to avoid etching damage to the central light emitting area aa when etching to form the first light shading structure. At the same time, due to the existence of the first protective structure 3, the first light shading structure can be fully etched when etching to form the first light shading structure to prevent the subsequent first light shading structure from remaining in the central light emitting area aa, which is beneficial to ensure the light output efficiency of the central light emitting area aa.

[0097] Optionally, continuing to refer to step (d2), the driving substrate 1 includes multiple main bonding structures 10 and multiple backup bonding structures 20; the light-emitting element 2 also includes an electrode structure 202 located on the side of the light-emitting element body 20 close to the driving substrate 1; the electrode structure 202 is electrically connected to the main bonding structure 20; the method for preparing the display panel also includes: preparing a first protective structure 3 on the side of the light-emitting element 2 away from the driving substrate 1, and preparing a second protective structure 5 on the side of the backup bonding structure 20, the second protective structure 5 covering at least part of the backup bonding structure 20.

[0098] Specifically, the first protective structure 3 and the second protective structure 5 are formed by patterning the protective layer 30, that is, the first protective structure 3 and the second protective structure 5 are formed by the same process step, and the preparation process is simple. Among them, the first protective structure 3 covers at least part of the top light emitting surface 20a and part of the side light emitting surface 20b, and the second protective structure 5 covers at least part of the spare bonding structure 20, so that the spare bonding structure 20 and the metal wiring thereunder can be shielded by the second protective structure 5, thereby reducing the reflection of the metal wiring and improving the performance of the display panel.

[0099] Exemplarily, the second protection structure 5 can completely cover the backup bonding structure 20 , which is helpful to increase the shielding area of ​​the metal wiring, thereby further reducing the reflection of the metal wiring and improving the performance of the display panel.

[0100] S205 , preparing a light-shielding layer, wherein the light-shielding layer covers the light-emitting element and the first protective structure.

[0101] Specifically, referring to step (e2), a light shielding layer 40 is prepared, and the light shielding layer 40 covers the light emitting element 2 and the first protective structure 3 , that is, the upper surface of the first protective structure 3 is covered by the light shielding layer 40 .

[0102] S206 , patterning the light-shielding layer to form a first light-shielding structure; the first light-shielding structure includes a first light-shielding portion, and the first light-shielding portion covers at least a portion of the edge light-emitting area.

[0103] Specifically, referring to step (f2), the light shielding layer 40 is patterned by an etching process to form a first light shielding structure 4, and the first light shielding structure 4 includes a first light shielding sub-portion 41, and the first light shielding sub-portion 41 covers at least a portion of the edge light emitting area bb, which is conducive to reducing the reflection of external ambient light through the first light shielding sub-portion 41. In addition, the first light shielding sub-portion 41 can prevent crosstalk between two adjacent light-emitting elements 2, thereby reducing color deviation and improving the display performance of the display panel.

[0104] Optionally, referring to step (f2), the method for preparing the display panel further includes: preparing a second light shielding structure 6 on a side of the second protection structure 5 away from the driving substrate 1 while preparing the first light shielding structure 4 .

[0105] Specifically, the second light-shielding structure 6 covers the second protective structure 5 , so that the second light-shielding structure 6 further reduces the reflection of the metal wiring, thereby improving the performance of the display panel.

[0106] It should be noted that after a whole light-shielding layer is prepared on the side of the first protective structure 3 away from the driving substrate 1, the light-shielding layer is patterned to form the first light-shielding structure 4 and the second light-shielding structure 6. That is, the first light-shielding structure 4 and the second light-shielding structure 6 are formed through the same process steps, and the preparation process is simple.

[0107] The method for preparing a display panel provided by an embodiment of the present invention adopts the same process steps to prepare the first protection structure and the second protection structure, which can simplify the preparation process on the one hand, and can protect the light-emitting element through the first protection structure, and can shield the metal wiring through the second protection structure on the other hand. In addition, the first shading structure and the second shading structure are prepared by the same process steps, which can simplify the preparation process on the one hand, and can shield the metal wiring such as the edge light emitting area, electrode structure, drive circuit and bonding structure through the first shading structure, and can shield the spare bonding structure and the drive circuit through the second shading structure, thereby reducing metal reflection and improving the performance of the display panel.

[0108] Based on the same inventive concept, an embodiment of the present invention further provides a display device, Fig.14 FIG. 1 is a schematic diagram of a display device provided by an embodiment of the present invention. Fig.14 As shown, the display device includes the display panel provided by any embodiment of the present invention. Therefore, the display device provided by the embodiment of the present invention has the corresponding beneficial effects of the display panel provided by the embodiment of the present invention, which will not be repeated here. Exemplarily, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and a car display device, which is not limited by the embodiment of the present invention.

[0109] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: include: A driving substrate and a plurality of light emitting elements located on one side of the driving substrate; The light emitting element comprises a light emitting element body; the light emitting element body comprises a top light emitting surface and a side light emitting surface which are connected and arranged; A plurality of first protective structures, wherein the first protective structures cover at least a portion of the top light emitting surface and a portion of the side light emitting surface; A plurality of first light shielding structures surround at least a portion of the light emitting element.

2. The display panel according to claim 1, characterized in that: The top light emitting surface includes a central light emitting area and an edge light emitting area, and the edge light emitting area surrounds the central light emitting area; The first protection structure covers the central light emitting area; the first light shading structure includes a first light shading section, and the first light shading section covers at least a portion of the edge light emitting area.

3. The display panel according to claim 1, characterized in that: The driving substrate includes a plurality of main bonding structures and a plurality of backup bonding structures; the light-emitting element also includes an electrode structure located on a side of the light-emitting element body close to the driving substrate; the electrode structure is electrically connected to the main bonding structure; The display panel further includes a plurality of second protection structures, wherein the second protection structures cover at least a portion of the backup bonding structures.

4. The display panel according to claim 3, characterized in that: The display panel further includes a plurality of second light shielding structures, and the second light shielding structures cover the second protection structure.

5. The display panel according to claim 4, characterized in that: The first light shielding structure includes a second light shielding sub-section; the second light shielding sub-section covers the main bonding structure, the electrode structure and part of the side light emitting surface; The thickness of the second light-shielding structure is greater than the thickness of the second light-shielding portion.

6. The display panel according to claim 4, characterized in that: The second light shielding section includes a first surface away from the driving substrate; the second light shielding structure includes a second surface away from the driving substrate; The radius of curvature of the first surface is smaller than the radius of curvature of the second surface.

7. The display panel according to claim 4, characterized in that: The second light shielding structure includes a second surface away from the driving substrate; In the plurality of second light-shielding structures, the maximum curvature radius of the second surface is R1, and the minimum curvature radius of the second surface is R2; Among them, |R2-R1| / R1≤20%.

8. The display panel according to claim 4, characterized in that: The first light shielding structure includes a second light shielding sub-section; the second light shielding sub-section covers the main bonding structure, the electrode structure and part of the side light emitting surface; Along the thickness direction of the display panel, the height of the side light emitting surface is D1; ​​the height of the side light emitting surface covered by the second light shielding portion is D2; Among them, D2 / D1≤1 / 3.

9. The display panel according to claim 1, characterized in that: Along the thickness direction of the display panel, the first protection structure includes a first protection surface and a second protection surface; the first protection surface is located on a side of the second protection surface away from the drive substrate; The area of ​​the second protection surface is greater than or equal to the area of ​​the first protection surface.

10. The display panel according to claim 1, characterized in that: The first protection structure includes a light-transmitting organic material.

11. A method for preparing a display panel, characterized in that: include: Providing a drive substrate; transferring a plurality of light emitting elements to one side of the driving substrate; The light emitting element comprises a light emitting element body; the light emitting element body comprises a top light emitting surface and a side light emitting surface which are connected and arranged; A first protective structure is prepared on a side of the light emitting element away from the driving substrate; the first protective structure covers at least a portion of the top light emitting surface and a portion of the side light emitting surface; A first light shielding structure is prepared, wherein the first light shielding structure surrounds at least a portion of the light emitting element.

12. The preparation method according to claim 11, characterized in that: The top light emitting surface includes a central light emitting area and an edge light emitting area, and the edge light emitting area surrounds the central light emitting area; A first protective structure is prepared on a side of the light emitting element away from the driving substrate, comprising: Preparing a protective layer on a side of the light emitting element away from the driving substrate; Patterning the protective layer to form a first protective structure; the first protective structure covers the central light emitting area; Preparing a first light shielding structure, comprising: preparing a light shielding layer, wherein the light shielding layer covers the light emitting element and the first protective structure; The light-shielding layer is patterned to form a first light-shielding structure; the first light-shielding structure includes a first light-shielding portion, and the first light-shielding portion covers at least a portion of the edge light-emitting area.

13. The preparation method according to claim 11, characterized in that: The driving substrate includes a plurality of main bonding structures and a plurality of backup bonding structures; the light emitting element also includes an electrode structure located on a side of the light emitting element body close to the driving substrate; The electrode structure is electrically connected to the main bonding structure; The preparation method further comprises: While preparing a first protective structure on a side of the light emitting element away from the driving substrate, a second protective structure is prepared on a side of the backup bonding structure, wherein the second protective structure covers at least a portion of the backup bonding structure.

14. The preparation method according to claim 13, characterized in that: The preparation method further comprises: While preparing the first light shielding structure, a second light shielding structure is prepared on a side of the second protection structure away from the driving substrate.

15. A display device, characterized in that: A display panel comprising any one of claims 1 to 10.

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