Display panel, preparation method thereof and display device

Abstract

The application discloses a display panel, a preparation method thereof and a display device. The display panel comprises a driving substrate and a light emitting element located on one side of the driving substrate. The light emitting element comprises a light emitting element body and a protection structure. The protection structure contacts and covers a light emitting surface of the light emitting element body. The light emitting surface comprises a first light emitting surface and / or a side light emitting surface. The first light emitting surface is a surface of the light emitting element body away from the driving substrate. The plane of the side light emitting surface intersects with the plane of the first light emitting surface. The protection structure in at least part of the light emitting elements is independently arranged. The protection structure can protect the light emitting element body, avoid the problem of residual shading material on the first light emitting surface of the light emitting element body, ensure the light emitting efficiency of the light emitting element and improve the display effect. In addition, the protection structure in at least part of the light emitting elements is independently arranged. The protection structure can protect the corresponding light emitting element body, thereby improving the protection effect.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, in particular to a display panel, a preparation method thereof and a display device. BACKGROUND

[0002] With the development of display technology, display products show a diversified development trend. Micro light emitting elements gradually increase in application in display products due to their advantages of high brightness, high contrast and high reliability. When a micro light emitting element display device displays, the contrast of the display picture is reduced due to the existence of ambient light and the high reflectivity of the metal traces in the light emitting element and the back plate, which affects the user's viewing experience.

[0003] In the prior art, in order to reduce the reflection of light by the light emitting element and the metal traces, a light shielding material is generally used to shield the metal traces. However, the prior art has the problem of residue of the light shielding material on the light emitting surface of the light emitting element, which affects the light emitting efficiency of the light emitting element. SUMMARY

[0004] Therefore, the present application provides a display panel, a preparation method thereof and a display device to solve the problem of residue of the light shielding material, improve the light emitting efficiency of the light emitting element and ensure the display effect.

[0005] In a first aspect, an embodiment of the present application provides a display panel, comprising a driving substrate and a light emitting element located on one side of the driving substrate.

[0006] The light emitting element comprises a light emitting element body and a protection structure, the protection structure contacts and covers a light emitting surface of the light emitting element body, the light emitting surface comprises a first light emitting surface and / or a side light emitting surface, the first light emitting surface is a surface of the light emitting element body away from the driving substrate, and the plane where the side light emitting surface is located intersects the plane where the first light emitting surface is located.

[0007] The protection structure in at least part of the light emitting elements is independently provided.

[0008] In a second aspect, an embodiment of the present application provides a preparation method of a display panel, comprising:

[0009] providing a driving substrate;

[0010] transporting a light emitting element to one side of the driving substrate; the light emitting element comprises a light emitting element body and a protection structure, the protection structure contacts and covers a light emitting surface of the light emitting element body, the light emitting surface comprises a first light emitting surface and / or a side light emitting surface, the first light emitting surface is a surface of the light emitting element body away from the driving substrate, and the plane where the side light emitting surface is located intersects the plane where the first light emitting surface is located; the protection structure in at least part of the light emitting elements is independently provided.

[0011] In a third aspect, an embodiment of the present application provides a display device, comprising the display panel of the first aspect of the present application.

[0012] In the embodiment of the present application, the light emitting element comprises a light emitting element body and a protection structure, the protection structure contacts and covers the light emitting surface of the light emitting element body, and the light emitting surface comprises a first light emitting surface and / or a side light emitting surface. The protection structure can protect the light emitting element body, avoid the problem of residual shading material on the first light emitting surface of the light emitting element body, ensure the light emitting efficiency of the light emitting element, and improve the display effect. In addition, the protection structure in at least part of the light emitting elements is independently arranged, and the protection structure can protect the corresponding light emitting element body, reduce or even avoid damage to the light emitting surface of the light emitting element body during etching of the shading material, and further ensure the light emitting effect and light emitting efficiency of the light emitting element body. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0014] Figure 2 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1. Figure 1 A structural schematic diagram along the A-A' direction is shown in FIG. 2.

[0015] Figure 3 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0016] Figure 4 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0017] Figure 5 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1. Figure 4 A structural schematic diagram along the B-B' direction is shown in FIG. 3.

[0018] Figure 6 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0019] Figure 7 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0020] Figure 8 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0021] Figure 9 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0022] Figure 10 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0023] Figure 11 Yet another light propagation schematic diagram provided for an embodiment of the present application;

[0024] Figure 12 Still another display panel partial cross-sectional structure schematic diagram provided for an embodiment of the present application;

[0025] Figure 13 Yet another display panel partial cross-sectional structure schematic diagram provided for an embodiment of the present application;

[0026] Figure 14 Still another display panel partial cross-sectional structure schematic diagram provided for an embodiment of the present application;

[0027] Figure 15 Yet another display panel structure schematic diagram provided for an embodiment of the present application;

[0028] Figure 16 For Figure 15 Structure schematic diagram along C-C' direction;

[0029] Figure 17 Structure schematic diagram of another light emitting element provided for an embodiment of the present application;

[0030] Figure 18 Flow chart of a display panel preparation method provided for an embodiment of the present application;

[0031] Figure 19 For Figure 18 Schematic diagram of the preparation method shown;

[0032] Figure 20 Flow chart of a light-transmitting protection structure preparation method provided for an embodiment of the present application;

[0033] Figure 21 For Figure 20 Schematic diagram of the preparation method shown;

[0034] Figure 22 Flow chart of another light-transmitting protection structure preparation method provided for an embodiment of the present application;

[0035] Figure 23 For Figure 22 Schematic diagram of the preparation method shown;

[0036] Figure 24 Flow chart of yet another light-transmitting protection structure preparation method provided for an embodiment of the present application;

[0037] Figure 25 For Figure 24 Schematic diagram of the preparation method shown;

[0038] Figure 26A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6.

[0039] Figure 27 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6. Figure 26 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6.

[0040] Figure 28 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6.

[0041] Figure 29 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6. Figure 28 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6.

[0042] Figure 30 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6.

[0043] Figure 31 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6. Figure 30 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6.

[0044] Figure 32 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6.

[0045] Figure 33 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6. Figure 32 A flow chart of another method for manufacturing a display panel according to an embodiment of the present application is shown in FIG. 6.

[0046] Figure 34 A structural schematic diagram of a display device according to an embodiment of the present application is shown in FIG. 8. DETAILED DESCRIPTION

[0047] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the present application and are not limiting of the present application. It should also be noted that, for the purpose of description, only the parts related to the present application are shown in the accompanying drawings rather than all the parts.

[0048] It should be noted that the terms "have", "contain", "include" and the like used in the present application are all open terms, i.e., when a module is described as "having", "containing" or "including" a first element, a second element and / or a third element, it means that the module includes the first element, the second element and / or the third element in addition to other elements. In addition, the ordinal numbers "first", "second" and "third" in the present application are not intended to limit the specific order, but merely to distinguish the parts. In the present application, when layer A and layer B are described as "disposed in the same layer", it means that layer A and layer B are made of the same material and by the same process.

[0049] In the related art, the preparation process of the light shielding material 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 side surface of the driving substrate facing the light emitting element, covering the light emitting element and the metal traces in the driving substrate. Then, the light shielding layer is patterned to remove the light shielding layer covering the light emitting surface, so that the light shielding layer only covers the metal traces in the driving substrate. However, the inventors have found that in the related art, when the light shielding layer is patterned, the light emitting surface of the light emitting element may be damaged, affecting the light emitting of the light emitting element. Moreover, the light shielding material is easily left on the light emitting surface of the light emitting element, thereby affecting the light emitting efficiency of the light emitting element, leading to a decrease in display brightness and affecting the display effect of the display device.

[0050] Based on the defects of the above related art, the present application provides a display panel, comprising a driving substrate and a light emitting element located on one side of the driving substrate.

[0051] The light emitting element comprises a light emitting element body and a protection structure, the protection structure contacts and covers the light emitting surface of the light emitting element body, the light emitting surface comprises a first light emitting surface and / or a side light emitting surface, the first light emitting surface is the surface of the light emitting element body away from the driving substrate, and the plane of the side light emitting surface intersects the plane of the first light emitting surface.

[0052] The protection structure in at least part of the light emitting elements is independently provided.

[0053] Through the above technical solution, the protection structure can protect the light emitting element body, avoid the problem of light shielding material left on the first light emitting surface of the light emitting element body, ensure the light emitting efficiency of the light emitting element, and improve the display effect. In addition, the protection structure in at least part of the light emitting elements is independently provided, and the protection structure can protect the corresponding light emitting element body, reduce or even avoid the damage to the light emitting surface of the light emitting element body when etching the light shielding material, thereby ensuring the light emitting effect and light emitting efficiency of the light emitting element body.

[0054] The above is the core idea of the present application, and the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0055] Figure 1 A structural schematic diagram of a display panel provided by the present application is shown in the following figure, Figure 2 is Figure 1 is a sectional structure schematic diagram along A-A', referring to Figure 1 and Figure 2In the embodiment of the present application, the display panel comprises a driving substrate 1 and a light emitting element 2 located on one side of the driving substrate 1; the light emitting element 2 comprises a light emitting element body 20 and a protection structure 21, the protection structure 21 contacts and covers the light emitting surface of the light emitting element body 20, the light emitting surface comprises a first light emitting surface 20a and / or a side light emitting surface 20b, the first light emitting surface 20a is the surface of the light emitting element body 20 away from the driving substrate 1, and the side light emitting surface 20b is located on a plane intersecting the plane of the first light emitting surface 20a; and the protection structure 21 in at least part of the light emitting element 2 is independently arranged.

[0056] Reference Figure 1 And Figure 2 The driving substrate 1 can comprise a substrate 101 and a driving layer arranged on one side of the substrate 101, and the substrate 101 can be a rigid substrate or a flexible substrate, which is not limited in the embodiment of the present application. The specific structure of the driving layer can be arranged according to actual needs, for example, when the driving mode of the light emitting element 2 is active driving, the driving layer can comprise a driving circuit 102 and a driving signal line 103, etc.; when the driving mode of the light emitting element 2 is passive driving, the driving layer can comprise a driving signal line 103, and the arrangement of the driving layer is not described or limited herein.

[0057] The light emitting element 2 can be a micro light emitting diode (Micro LED) or a mini light emitting diode (Mini LED) or the like. The light emitting element 2 is arranged on one side of the driving substrate 1, and the light emitting element body 20 can refer to a micro light emitting diode chip, which can comprise a light emitting layer 201 and an electrode 202. For different structures of the micro light emitting diode chip, the relative positions of the light emitting layer 201 and the electrode 202 can be different, and in the embodiment of the present application, the flip chip is taken as an example, the light emitting layer 201 can be located on the side of the electrode 202 away from the driving substrate 1, which is not limited in practice. In the embodiment not shown in the present application, the light emitting element body 20 can also be a positive chip (the electrode 202 is located on the side of the light emitting layer 201 away from the driving substrate 1) or a vertical chip (two electrodes are respectively located on the two sides of the light emitting layer 201 along the thickness direction of the display panel), which is not described or limited in the embodiment of the present application.

[0058] The light emitting layer 201 is used for light emission, and the electrode 202 is used for electrical connection with the driving layer in the driving substrate 1. The light emitting surface of the light emitting element body 20 can refer to the light emitting surface of the light emitting layer 201, and the protection structure 21 contacts and covers at least part of the light emitting surface of the light emitting element body 20, thereby protecting at least part of the light emitting surface of the light emitting element body 20. Figure 1The shape filled with the shown pattern represents a light emitting element 2, and the rectangular frame between adjacent light emitting elements 2 represents a spare light emitting element setting area, which is used for setting a spare light emitting element. Figure 1 The relative position relationship between the light emitting element 2 and the spare light emitting element setting area shown in the figure is only an example, and is not limited to this in practice. Of course, in other embodiments, the display panel can also not be provided with a spare light emitting element setting area.

[0059] In the figure, the first light emitting surface 20a of the light emitting element body 20 can refer to the light emitting surface of the side of the light emitting element body 20 away from the driving substrate 1, and the side light emitting surface 20b of the light emitting element body 20 can refer to the connecting surface of the side surface of the light emitting element body 20 facing the driving substrate 1 and the first light emitting surface 20a. Generally, the first light emitting surface 20a and the side light emitting surface 20b are the main light emitting surfaces of the light emitting element body 20.

[0060] The embodiment of the present application does not limit the specific position of the protection structure 21 on the light emitting surface, Figure 1 and Figure 2 The protection structure 21 covers the first light emitting surface 20a of the light emitting element body 20, which is shown in the figure, and is not limited to this in practice. In this arrangement, the protection structure 21 can be made of a light-transmitting material to form a light-transmitting protection structure 211. In this way, even if the light emitting element 2 needs to be transported later and the preparation of the light shielding layer and the patterning process are required, the presence of the protection structure 21 can prevent the light emitting element body 20 from being damaged. At the same time, the light shielding material is prevented from directly contacting the light emitting element body 20, avoiding the problem of the light shielding material remaining on the first light emitting surface 20a of the light emitting element body 20 in the related art, ensuring the light emitting efficiency of the light emitting element 2, and improving the display effect.

[0061] In addition, in other embodiments, when the protection structure 21 is arranged on the side light emitting surface 20b of the light emitting element body 20, the protection structure 21 can be directly made of a light shielding material to form a light shielding protection structure. In this way, after the light emitting element 2 is transported later, there is no need to additionally prepare a light shielding layer, and on the basis of ensuring the light emitting efficiency of the light emitting element body 20, the preparation of the light shielding layer and the patterning process can be removed, thereby simplifying the process and fundamentally avoiding the problems of the light shielding material remaining on the first light emitting surface 20a and the damage of the light emitting element 2.

[0062] It should be noted that in the embodiment of the present application, the protection structure 21 of at least part of the light emitting elements 2 is independently arranged, in other words, the protection structure 21 of at least part of the light emitting elements 2 is independent of each other and does not contact. In some embodiments, the protection structure 21 of all light emitting elements 2 can be independently arranged, and the light emitting element body 20 corresponds to the protection structure 21 one by one, and any two adjacent protection structures 21 do not contact. In this way, the protection structure 21 can protect the respective corresponding light emitting element body 20, and the protection effect is good.

[0063] The protection structure 21 can be prepared on part of the light emitting surface of the light emitting element body 20, and then the light emitting element 2 is formed, and then the light emitting element 2 is transferred to the driving substrate 1.

[0064] In the embodiment of the present application, the light emitting element comprises a light emitting element body and a protection structure, the protection structure contacts and covers the light emitting surface of the light emitting element body, and the light emitting surface comprises a first light emitting surface and / or a side light emitting surface. The protection structure can protect the light emitting element body, avoid the problem of residual light shielding material on the first light emitting surface of the light emitting element body, ensure the light emitting efficiency of the light emitting element, and improve the display effect. In addition, the protection structure in at least part of the light emitting element is independently arranged, and the protection structure can protect the corresponding light emitting element body, reduce or even avoid damage to the light emitting surface of the light emitting element body during etching of the light shielding material, and thus ensure the light emitting effect and light emitting efficiency of the light emitting element body.

[0065] The display panel provided in the embodiment of the present application can be a transparent display panel or a non-transparent display panel, which is not limited in the present application. For the non-transparent display panel, the light shielding layer prepared after the light emitting element is transferred to the driving substrate is generally prepared by evaporation process, and the light shielding material is more likely to be residual. By using the scheme in the present application, the problem of residual light shielding material can be effectively avoided.

[0066] Optionally, reference can be made to Figure 1 and Figure 2 In some embodiments, the protection structure 21 comprises a light-transmitting protection structure 211, and the light-transmitting protection structure 211 at least covers the first light emitting surface 20a.

[0067] As described above, in the embodiment, the light-transmitting protection structure 211 can be prepared by using a light-transmitting material, and the light-transmitting protection structure 211 is arranged to at least contact and cover the first light emitting surface 20a. The presence of the light-transmitting protection structure 211 will not affect the light emitting of the first light emitting surface 20a of the light emitting element body 20, and the light emitting efficiency of the light emitting element body 20 is ensured.

[0068] When the protection structure 21 is the light-transmitting protection structure 211, a light shielding layer needs to be prepared in the subsequent process. At this time, along the thickness direction Z of the display panel, the part of the light shielding layer overlapping with the first light emitting surface 20a contacts the protection structure 21 covered by the first light emitting surface 20a. When this part of the light shielding layer is removed, the first light emitting surface 20a will not be damaged. In addition, compared with the first light emitting surface 20a, the surface of the protection structure 21 is smoother, and the light shielding material is not easy to be residual on the protection structure 21, so that the light emitting efficiency of the first light emitting surface 20a can be ensured.

[0069] Exemplarily, Figure 3 A partial cross-sectional structure schematic diagram of a display panel provided in the embodiment of the present application is shown in FIG. 2, and the cross-sectional position is the same as the above-mentioned Figure 2The cross-sectional positions shown are similar, for reference Figure 3 In possible embodiments, the first light-out surface 20a comprises a plurality of microstructures 203.

[0070] The microstructures 203 can refer to a plurality of protruding and / or recessed structures on the first light-out surface 20a, Figure 3 For example, the first light-out surface 20a comprises a plurality of protruding microstructures 203, but the actual implementation is not limited thereto. The presence of the microstructures 203 makes the first light-out surface 20a a rough surface. The advantage of setting the microstructures 203 is that the light-out angle of the light-emitting element body 20 can be adjusted through the microstructures 203, avoiding total internal reflection of the light rays emitted by the light-emitting element body 20 at the first light-out surface 20a, thereby improving the light-emitting efficiency of the light-emitting element body 20.

[0071] When the first light-out surface 20a is provided with a plurality of microstructures 203, the roughness of the first light-out surface 20a is large. If the process in the related art is followed, the light-blocking material is extremely easy to remain on the first light-out surface 20a. In the present application, the light-transmitting protective structure 211 covers the first light-out surface 20a, which can improve the smoothness of the side surface of the light-emitting element 2 away from the driving substrate 1, reduce the difficulty of removing the light-blocking material from the side surface of the light-emitting element 2 away from the driving substrate 1, and avoid the problem of remaining light-blocking material.

[0072] Figure 1 In the embodiment shown, the light-transmitting protective structure 211 only covers the first light-out surface 20a, Figure 4 Another structure schematic diagram of a display panel provided by an embodiment of the present application is shown, Figure 5 For Figure 4 A structure schematic diagram along the B-B' direction is shown, Figure 4 And Figure 5 In the embodiment shown, the light-transmitting protective structure 211 covers the first light-out surface 20a and the side light-out surface 20b. The light-transmitting protective structure 211 can simultaneously protect the first light-out surface 20a and the side light-out surface 20b. In addition, when the light-transmitting protective structure 211 covers the side light-out surface 20b, the light rays emitted by the side light-out surface 20b of the light-emitting element 2 can also be emitted through the light-transmitting protective structure 211, thereby improving the light-emitting efficiency of the light-emitting element 2 and improving the display effect under a large viewing angle.

[0073] Optionally, in possible embodiments, the refractive index of the light-transmitting protective structure 211 can be less than the refractive index of the light-emitting element body 20.

[0074] Specifically, the light emitted by the light emitting element body 20 is incident to the light-transmissive protective structure 211, the refractive index of the light-transmissive protective structure 211 is less than the refractive index of the light emitting element body 20, the light is emitted to the outside environment through a medium with a small refractive index, the probability of total reflection of the light at the interface between the light emitting element body 20 and the light-transmissive protective structure 211 is reduced, the light emitting efficiency is improved, and the light is more likely to be emitted in a direction perpendicular or close to perpendicular to the first light emitting surface 20a, so that the light emitting viewing angle is adjusted and the normal viewing angle light emitting brightness is improved. Figure 6 A light propagation schematic diagram is provided for the embodiment of the present application, Figure 6 The arrows in the figure represent light rays, for example, Figure 6 As shown in (a) of the figure, if the light is directly emitted by the light emitting element body 20 to the air, the refractive angle θ1 of the emitted light is large due to the large difference in refractive index between the air and the light emitting element body 20. Figure 6 As shown in (b) of the figure, if the light-transmissive protective structure 211 is arranged on the light emitting surface of the light emitting element body 20, and the refractive index of the light-transmissive protective structure 211 is less than the refractive index of the light emitting element body 20, the light-transmissive protective structure 211 serves as a transition medium between the light emitting element body 20 and the air, the difference in refractive index between the adjacent two media in the light propagation path is small, and the refractive angle θ2 of the emitted light is small, so that the light emitting viewing angle is adjusted.

[0075] The embodiment of the present application does not limit the specific value of the refractive index of the light-transmissive protective structure 211, which can be set according to actual needs by those skilled in the art.

[0076] Optionally, Figure 7 Another partial cross-sectional structure schematic diagram of a display panel is provided for the embodiment of the present application, which can be combined with reference to Figure 1 and Figure 7 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, the refractive index of the first color light emitting element body 20R is greater than the refractive index of the second color light emitting element body 20G and / or the third color light emitting element body 20B; the light-transmissive protective structure 211 includes a first protective structure 2111, a second protective structure 2112, and a third protective structure 2113; the first protective structure 2111 contacts and covers the light emitting surface of the first color light emitting element body 20R, the second protective structure 2112 contacts and covers the light emitting surface of the second color light emitting element body 20G, and the third protective structure 2113 contacts and covers the light emitting surface of the third color light emitting element body 20B; wherein the refractive index of the first protective structure 2111 is greater than the refractive index of the second color protective structure 21 and / or the third color protective structure 21.

[0077] 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 three different color micro light emitting diode chips. It can be understood that the materials of the light emitting layers 201 in the different color light emitting element bodies 20 are different, so that the refractive indexes of the different color light emitting element bodies 20 can be different. Therefore, the embodiment proposes that the light-transmitting protection structures 211 covering the different color light emitting element bodies 20 can be set differently according to the differences in the refractive indexes of the different color light emitting element bodies 20. For example, the refractive index of the light-transmitting protection structure 211 above the light emitting element body 20 with a larger refractive index can be set to be larger, and the refractive index of the light-transmitting protection structure 211 above the light emitting element body 20 with a smaller refractive index can also be set to be smaller, so that the probabilities of total reflection of light of each color at the interface between the light emitting element body 20 and the light-transmitting protection structure 211 are all relatively low, and the light emitting viewing angles of the color light emitting element bodies 20 can be adjusted, so as to ensure the light emitting brightness of the color light emitting element bodies 20 at the normal viewing angle.

[0078] Specifically, the light-transmitting protection structure 211 covering the first light emitting surface 20a of the first color light emitting element body 20R is defined as the first protection structure 2111, the light-transmitting protection structure 211 covering the first light emitting surface 20a of the second color light emitting element body 20G is defined as the second protection structure 2112, and the light-transmitting protection structure 211 covering the first light emitting surface 20a of the third color light emitting element body 20B is defined as the third protection structure 2113. As an optional implementation manner, among the three color light emitting element bodies 20, the refractive index of the first color light emitting element body 20R is larger, and the refractive indexes of the second color light emitting element body 20G and / or the third color light emitting element body 20B are smaller. Correspondingly, the refractive index of the first protection structure 2111 can be set to be larger than the refractive indexes of the second protection structure 2112 and / or the third protection structure 2113, so that the refractive index difference between each color light emitting element body 20 and the corresponding light-transmitting protection structure 211 is relatively balanced.

[0079] Among them, the first color light emitting element body 20R can be a red light emitting element body, the second color light emitting element body can be a green light emitting element body, and the third color light emitting element body can be a blue light emitting element body, and the combination of red, green and blue light emitting element bodies realizes full-color display. The inventor finds that the light emitting layer of the red light emitting element body will be doped with elements, which will cause the refractive index of the light emitting layer 1 of the red light emitting element body to be larger, so the refractive index of the light-transmitting protection structure corresponding to the red light emitting element body can be set to be larger, and the refractive index of the light-transmitting protection structure corresponding to the blue and / or green light emitting element body can be set to be smaller.

[0080] Optionally, Figure 8 Another partial cross-sectional structure schematic diagram of a display panel provided by the embodiment is provided, which is shown in FIG. 6.Figure 8 The display panel further comprises an encapsulation layer 3 located on the side of the light-transmitting protective structure 211 away from the driving substrate 1; the refractive index of the light-transmitting protective structure 211 is greater than the refractive index of the encapsulation layer 3.

[0081] Specifically, the encapsulation layer 3 is located on the light-emitting side of the light-emitting element 2, and the light-transmitting protective structure 211 can cover the light-transmitting protective structure 211 to achieve encapsulation and protection. The encapsulation layer 3 can be an integral structure along the thickness direction Z of the display panel, and the encapsulation layer 3 can cover at least part of the light-emitting element 2. The encapsulation layers 3 corresponding to different light-emitting elements 2 are in contact with each other and are integrally arranged. The area between the adjacent two light-emitting elements 2 can also be filled by the encapsulation layer 3, that is, the encapsulation layer 3 can cover at least part of the side light-emitting surface 20b of the light-emitting element body 20. Optionally, the encapsulation layer 3 located on the side of the first light-emitting surface 20a of the light-emitting element body 20 and the encapsulation layer 3 covering the side light-emitting surface 20b of the light-emitting element body 20 can be made of the same material in the same process, or can be made of different materials in different processes, and the present embodiment does not limit this.

[0082] In the present embodiment, the refractive index of the encapsulation layer 3 can be less than the refractive index of the light-transmitting protective structure 211, so that the probability of total reflection of the light emitted by the light-emitting element body 20 at the interface between the light-transmitting protective structure 211 and the encapsulation layer 3 is reduced, and the light-emitting efficiency is improved. In addition, referring to Figure 9 , Figure 9 Another light propagation diagram provided by the present embodiment is provided. By setting the refractive index of the encapsulation layer 3 to be less than the refractive index of the light-transmitting protective structure 211, the encapsulation layer 3 serves as a transition medium between the light-transmitting protective structure 211 and air, further reducing the refractive index difference between the adjacent two media in the light propagation path, and the refraction angle θ3 of the light emitted through the encapsulation layer 3 is further reduced, thereby further improving the normal viewing angle light-emitting brightness.

[0083] The present embodiment does not limit the specific value of the refractive index of the encapsulation layer 3, and a person skilled in the art can set it according to actual needs.

[0084] Optionally, in possible embodiments, the display panel can still comprise the encapsulation layer 3 located on the side of the light-transmitting protective structure 211 away from the driving substrate 1, and the material of the light-transmitting protective structure 211 and the encapsulation layer 3 can be different.

[0085] The position of the encapsulation layer 3 can refer to Figure 8 This will not be described again in this embodiment. In the present embodiment, the light-transmitting protective structure 211 and the encapsulation layer 3 can be formed of different materials in different preparation processes. A person skilled in the art can select materials with different refractive indices and / or different hardnesses to form the light-transmitting protective structure 211 and the encapsulation layer 3 according to actual needs.

[0086] Exemplarily, the light-transmissive protective structure 211 is prepared by using a glue material with a large refractive index and a small hardness, and the encapsulation layer 3 is prepared by using a glue material with a small refractive index and a large hardness, so as to ensure the light extraction efficiency at the normal viewing angle and the encapsulation effect, and avoid damage to the light-emitting element body 20 by the light-transmissive protective structure 211.

[0087] In some specific embodiments, the light-transmissive protective structure 211 is prepared by using a polydimethylsiloxane (PDMS) material, and the encapsulation layer 3 is prepared by using an organic silicon potting glue, but is not limited thereto.

[0088] Optionally, the side of the encapsulation layer 3 away from the driving substrate 1 can further include an encapsulation cover plate (not shown in the figure), and the encapsulation cover plate can be a glass cover plate, which protects the entire display panel.

[0089] Figure 10 A structure diagram of a light-emitting element provided in an embodiment of the present application can be referred to Figure 10 In possible embodiments, the light-transmissive protective structure can include a first position P1 and a second position P2, and the thickness of the light-transmissive protective structure 211 at the first position P1 is not equal to the thickness of the light-transmissive protective structure 211 at the second position P2 along the thickness direction Z of the display panel.

[0090] Specifically, the same light-transmissive protective structure 211 can be provided at different positions with different thicknesses, so that the light extraction surface of the light-transmissive protective structure 211 is not a flat surface extending in a certain direction, but a surface with ups and downs. As shown in Figure 10 The side surface of the light-transmissive protective structure 211 away from the light-emitting element body 20 can include at least the first position P1 and the second position P2, and the thickness of the light-transmissive protective structure 211 at the first position P1 is different from the thickness of the light-transmissive protective structure 211 at the second position P2, so that the height of the light extraction surface of the light-transmissive protective structure 211 is different. For example Figure 10 As shown in the figure, the thickness d1 of the light-transmissive protective structure 211 at the first position P1 is greater than the thickness d2 of the light-transmissive protective structure 211 at the second position P2, so that the height of the light extraction surface of the light-transmissive protective structure 211 at the first position P1 is higher than the height of the light extraction surface at the second position P2, but is not limited thereto. Figure 10 The first position P1 and the second position P2 shown in the figure are only examples, and any two points with different thicknesses on the light-transmissive protective structure 211 can be regarded as the first position P1 and the second position P2. Different light extraction surface shapes have different modulation conditions for the light emitted by the light-emitting element body 20. In this way, the light extraction surface shape of the light-transmissive protective structure 211 can be designed according to the actual situation, so as to adjust the light extraction viewing angle according to the requirements, and meet the diversified design requirements of the light extraction viewing angle.

[0091] In addition, in the subsequent parallel light shielding layer preparation and patterning process, if the light shielding material remains on the light transmission protection structure 211, removing the remaining light shielding material can also cause the light emitting surface of the light transmission protection structure 211 to have undulations.

[0092] Optionally, as shown in Figure 10 , the surface of the light transmission protection structure 211 on the side close to the light emitting element body 20 is parallel or approximately parallel to the plane on which the driving substrate 1 is located, and the surface of the light transmission protection structure 211 on the side away from the light emitting element body 20 has undulations.

[0093] Further, with reference to Figure 10 , in an exemplary embodiment, the light emitting surface of the light transmission protection structure 211 can be convex on the side away from the driving substrate 1.

[0094] As shown in Figure 10 , as an optional way, the light emitting surface of the light transmission protection structure 211 can be set as a convex lens structure, that is, along the thickness direction Z of the display panel, the distance between the middle region of the light emitting surface of the light transmission protection structure 211 and the light emitting element body 20 is greater than the distance between the edge region of the light emitting surface of the light transmission protection structure 211 and the light emitting element body 20. Figure 11 Another light propagation schematic diagram provided for an embodiment of the present application, Figure 11 , the arrows represent light, which can be referred to Figure 11 , when the light emitting surface of the light transmission protection structure 211 is convex on the side away from the driving substrate 1, the light emitting surface of the light transmission protection structure 211 is a convex surface, which can converge light, and the light emitted by the light emitting element body 20 is more likely to propagate to the middle region of the light transmission protection structure 211, thereby further improving the normal viewing angle luminance.

[0095] Figure 12 Still another partial cross-sectional structure schematic diagram of a display panel provided for an embodiment of the present application can be combined with reference to Figure 7 and Figure 12 , the light transmission protection structure 211 includes a transparent protection structure 212; or, the light transmission protection structure 211 includes a color filter protection structure 213.

[0096] With reference to Figure 7 , in some embodiments, the transparent colloid material can be used to prepare the light transmission protection structure 211 to form the transparent protection structure 212, which can allow various colors of light to pass through. Under this setting, the first light emitting surface 20a of the light emitting element 2 of different colors covers the same material of the transparent protection structure 212, which can reduce the preparation difficulty of the transparent protection structure 212.

[0097] With reference to Figure 12In other embodiments, a color resist material can be used to prepare the light-transmitting protective structure 211, forming a color-filtering protective structure 213, which allows light of the corresponding color to pass through. Assuming 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, then the color-filtering protective structure 213 should include a first color-filtering protective structure 2131, a second color-filtering protective structure 2132, and a third color-filtering protective structure 2133. The first color-filtering protective structure 2131 contacts and covers the first light-emitting surface 20a of the first-color light-emitting element body 20R, the second color-filtering protective structure 2132 covers the first light-emitting surface 20a of the second-color light-emitting element body 20G, and the third color-filtering protective structure 2133 contacts and covers the first light-emitting surface 20a of the third-color light-emitting element body 20B. The first color filter protection structure 2131 is made of a color resist material of the first color and is used to transmit the first color light while filtering out the second and third color light; the second color filter protection structure 2132 is made of a color resist material of the second color and is used to transmit the second color light while filtering out the first and third color light; the third color filter protection structure 2133 is made of a color resist material of the third color and is used to transmit the third color light while filtering out the first and second color light.

[0098] Setting the light-transmitting protection structure 211 as a color-filtering protection structure 213 can improve the purity of the light emitted by the light-emitting element 2 and avoid color deviation problems.

[0099] Optional, you can continue to refer to Figure 2 The driving substrate 1 may include a driving circuit 102 and a driving signal line 103. The driving circuit 102 is electrically connected to the driving signal line 103 and the light-emitting element 2, respectively. The display panel also includes a first light-shielding structure 4, which covers the driving circuit 102 and the driving signal line 103. The first light-shielding structure 4 exposes the side light-emitting surface 20b, or the first light-shielding structure 4 covers at least part of the side light-emitting surface 20b.

[0100] Specifically, the driving circuit 102 may include structures such as transistors and capacitors. The electrodes 202 of the light-emitting element body 20 are electrically connected to the driving circuit 102 and the driving signal line 103, thereby transmitting the driving signal to the light-emitting element 2. The specific arrangement of the driving circuit 102 and the driving signal line 103 is not described in detail or limited in this embodiment of the invention, and those skilled in the art can set it according to actual needs.

[0101] like Figure 2As shown, the first light-shielding structure 4 is the light-shielding layer mentioned above. Along the thickness direction Z of the display panel, the first light-shielding structure 4 overlaps with the driving circuit 102 and the driving signal line 103, thereby preventing light from being emitted on the driving circuit 102 and the driving signal line 103. Along the thickness direction Z of the display panel, the first light-shielding structure 4 partially contacts and covers the light-transmitting protective structure 211, preventing the first light-shielding structure 4 from affecting the light emitted by the light-emitting element body 20.

[0102] The first light-shielding structure 4 can be fabricated after the light-emitting element 2 is transferred to the driving substrate 1. Specifically, a full-length first initial light-shielding layer can be deposited on the side of the driving substrate 1 facing the light-emitting element 2, and then the first initial light-shielding layer can be patterned to form the first light-shielding structure 4 covering the driving circuit 102 and the driving signal line 103. The presence of the light-transmitting protection structure 211 can prevent the first initial light-shielding layer from remaining on the first light-emitting surface 20a of the light-emitting element body 20.

[0103] in, Figure 2 In the embodiment shown, the first light-shielding structure 4 exposes the side light-emitting surface 20b. In this configuration, the side light-emitting surface 20b of the light-emitting element 2 has a light-emitting path, which can improve the light-emitting efficiency of the light-emitting element 2. In addition, the first light-shielding structure 4 can also block the bottom of the light-emitting element 2 (the area where the electrode 202 is located) to a certain extent, thereby reducing the reflectivity of the display panel.

[0104] Figure 13 This is a partial cross-sectional structural diagram of another display panel provided in an embodiment of the present invention. Figure 14 This is a partial cross-sectional structural diagram of another display panel provided in an embodiment of the present invention. Figure 13 In the embodiment shown, the first light-shielding structure 4 covers all the side light-emitting surfaces 20b of the light-emitting element 2. The first light-shielding structure 4 can block the side light emission of the light-emitting element 2, so that the light is emitted from the first light-emitting surface 20a, thereby reducing the large viewing angle deviation problem caused by side light emission. Figure 14 In the embodiment shown, the light-transmitting protective structure 211 covers the first light-emitting surface 20a and the side light-emitting surface 20b of the light-emitting element body 20, and the first light-shielding structure 4 covers the side of the light-transmitting protective structure 211 away from the side light-emitting surface 20b. In this way, the light-emitting efficiency of the light-emitting element 2 can be taken into account and the problem of large viewing angle color deviation can be improved.

[0105] The above Figure 13 and Figure 14 In the embodiments, the transparent protective structure 212 is used as an example of the light-transmitting protective structure 211. In the embodiments not shown in the accompanying drawings of this invention, the transparent protective structure 212 can be replaced by the color-filtering protective structure 213.

[0106] Optional, Figure 15FIG. 2 shows a structural schematic diagram of another display panel according to an embodiment of the present application, Figure 16 For Figure 15 FIG. 3 shows a structural schematic diagram along the direction of C-C' of the display panel shown in FIG. 2, Figure 15 and Figure 16 In some other embodiments, the protection structure 21 comprises a light-shielding protection structure 214 covering the side light-emitting surface 20b.

[0107] As shown in FIG. 4, the present embodiment proposes another setting mode of the protection structure 21, i.e., the light-shielding protection structure 214 made of the light-shielding material covering at least part of the side light-emitting surface 20b of the light-emitting element body 20. Figure 15 and Figure 16 As shown in FIG. 4, the present embodiment proposes another setting mode of the protection structure 21, i.e., the light-shielding protection structure 214 made of the light-shielding material covering at least part of the side light-emitting surface 20b of the light-emitting element body 20.

[0108] The light-shielding protection structure 214 can be formed on the side light-emitting surface 20b of the light-emitting element body 20 before the light-emitting element 2 is transferred to the driving substrate 1, and after the light-emitting element 2 is transferred, there is no need to additionally prepare a light-shielding layer, thereby simplifying the process and fundamentally avoiding the problems of the light-shielding material remaining on the first light-emitting surface 20a and the damage of the light-emitting element 2.

[0109] The light-shielding protection structure 214 can be made of a black light-shielding material, and the specific material is not limited, which can be selected according to actual needs by those skilled in the art.

[0110] Further, continuing to refer to Figure 15 and Figure 16 The driving substrate 1 can still comprise a driving circuit 102 and a driving signal line 103, the driving circuit 102 is electrically connected with the driving signal line 103 and the light-emitting element 2 respectively; the display panel further comprises a second light-shielding structure 5 covering the driving circuit 102 and the driving signal line 103; and the light-shielding protection structure 214 is independently set with the second light-shielding structure 5.

[0111] The driving circuit 102 and the driving signal line 103 are arranged in the same manner as in the above embodiment, and details are not repeated here. The second light shielding structure 5 is used to shield the driving circuit 102 and the driving signal line 103 to avoid light emission on the driving circuit 102 and the driving signal line 103. A pixel region can be defined as a driving circuit 102 corresponding to a light emitting element 2, and the second light shielding structure 5 can cover the edge of the pixel region in the thickness direction Z of the display panel. The second light shielding structure 5 also overlaps with the light shielding protection structure 214 in the thickness direction Z of the display panel. For example, if the projection area of the light emitting element 2 on the driving substrate 1 is smaller than the projection area of the driving circuit 102, the edge of the second light shielding structure 5 can be located at the periphery of the light shielding protection structure 214, or in other words, the edge of the second light shielding structure 5 surrounds the light shielding protection structure 214. The light shielding protection structure 214 and the first light shielding structure 4 together play a light shielding role, which can further reduce the reflectivity and ensure the light emitting efficiency of the light emitting element 2.

[0112] It should be noted that the light shielding protection structure 214 and the second light shielding structure 5 are light shielding structures prepared in different process flows, and thus are independent of each other, that is, the light shielding protection structure 214 and the second light shielding structure 5 are not in contact with each other and are independent of each other. Independent arrangement can ensure that the light shielding protection structure 214 and the second light shielding structure 5 have greater freedom and are more flexible in arrangement position.

[0113] Optionally, the light shielding protection structure 214 and the second light shielding structure 5 can be prepared by using the same or different light shielding materials, and the present embodiment does not limit the same. In an exemplary embodiment, the light shielding protection structure 214 can be prepared by using a carbon black system material, for example, a carbon black plus acrylic resin material, and the second light shielding structure 5 can be prepared by using an organic dye type material, and the actual material selection is much more than this.

[0114] In addition, the second light shielding structure 5 in the present embodiment can have the same position as the first light shielding structure 4 in the above embodiment, but the preparation process is different. In the present embodiment, the second light shielding structure 5 can be prepared on one side of the driving substrate 1 first, and then the light emitting element 2 is transferred, and after the light emitting element 2 is transferred to the driving substrate 1, no other light shielding layer needs to be prepared.

[0115] Figure 17 Another structure diagram of a light emitting element provided by the present embodiment is shown in FIG. 6. Figure 2 and Figure 17 In a possible embodiment, the light emitting surface further includes a second light emitting surface 20c located on the side of the first light emitting surface 20a close to the driving substrate 1; in the thickness direction Z of the display panel, the first light emitting surface 20a covers the second light emitting surface 20c; or the second light emitting surface 20c covers the first light emitting surface 20a.

[0116] The second light exit surface 20c is a surface opposite to the first light exit surface 20a, and the second light exit surface 20c faces the driving substrate 1. The electrode 202 of the light emitting element body 20 can be arranged on the second light exit surface 20c. The side light exit surface 20b of the light emitting element 2 is the connecting surface of the first light exit surface 20a and the second light exit surface 20c. Figure 2 In the illustrated embodiment, along the thickness direction Z of the display panel, the first light exit surface 20a covers the second light exit surface 20c, that is, the projection area of the first light exit surface 20a in the direction is greater than the projection area of the second light exit surface 20c in the direction. The light emitting element body 20 is in the shape of an inverted trapezoid, and the area of the first light exit surface 20a is larger, which can ensure the light emitting efficiency at the normal viewing angle. Figure 17 In the illustrated embodiment, along the thickness direction Z of the display panel, the second light exit surface 20c covers the first light exit surface 20a, that is, the projection area of the first light exit surface 20a in the direction is less than the projection area of the second light exit surface 20c in the direction. The light emitting element body 20 is in the shape of a trapezoidal roof. In this arrangement, the light emitted by the side light exit surface 20b can also propagate upward, which is conducive to improving the light emitting efficiency.

[0117] Of course, in actual application, the shape of the light emitting element body 20 is not limited to this, and the embodiments of the present application only exemplarily list two optional shapes.

[0118] The display panel provided by the embodiments of the present application can also include any structure known to those skilled in the art, and the embodiments of the present application do not elaborate or limit this.

[0119] Based on the same concept, the embodiments of the present application also provide a preparation method of a display panel for preparing the display panel provided by any embodiment of the present application. The preparation method of the display panel comprises the following steps: step one, providing a driving substrate; step two, transferring a light emitting element to one side of the driving substrate. The light emitting element comprises a light emitting element body and a protection structure. The protection structure contacts and covers the light exit surface of the light emitting element body. The light exit surface comprises a first light exit surface and / or a side light exit surface. The first light exit surface is a surface of the light emitting element body away from the driving substrate. The plane where the side light exit surface is located intersects the plane where the first light exit surface is located. The protection structure in at least part of the light emitting elements is independently arranged.

[0120] The structure of the driving substrate and the light emitting element can refer to the above-mentioned embodiments and the corresponding drawings, which will not be described here. The preparation method of the display panel provided by the embodiments of the present application can protect the light emitting element body by arranging the protection structure in the light emitting element. The protection structure can avoid the problem of residual light shielding layer material on the first light exit surface of the light emitting element body, ensure the light emitting efficiency of the light emitting element, and improve the display effect. In addition, the protection structure in at least part of the light emitting elements is independently arranged, and the protection structure can protect the corresponding light emitting element body, thereby improving the protection effect.

[0121] Optionally, in some embodiments, the protective structure can be a light-transmissive protective structure, before (step two) in the above embodiments, the following can also be performed: providing a light-emitting element body and preparing a light-transmissive protective structure on at least a first light-out surface of the light-emitting element body.

[0122] Figure 18 A flowchart of a preparation method of a display panel according to an embodiment of the present application is shown in Figure 19 A schematic diagram of the preparation method is shown in Figure 18 The preparation method can be further refined on the basis of the above embodiments, and specifically includes the following steps: Figure 18 Figure 19 The preparation method can be further refined on the basis of the above embodiments, and specifically includes the following steps:

[0123] S110, providing a driving substrate.

[0124] S120, providing a light-emitting element body and preparing a light-transmissive protective structure on at least a first light-out surface of the light-emitting element body.

[0125] The light-emitting element body can refer to a micro light-emitting diode chip. The light-emitting element body 20 can include a light-emitting layer 201 and an electrode 202. The light-emitting layer 201 can be located on the side of the electrode 202 away from the driving substrate 1. The light-emitting layer 201 is used for light emission, and the electrode 202 is used for connection with the conductive structure in the driving substrate 1.

[0126] Referring to (b) in Figure 19 The light-transmissive protective structure 211 can be formed on at least the first light-out surface 20a of the light-emitting element body 20. The light-transmissive protective structure 211 is prepared from a light-transmissive material, and can be arranged one-to-one with the light-emitting element 2.

[0127] S130, transferring the light-emitting element to the side of the driving substrate.

[0128] The light-emitting element 2 transfer process can be a mass transfer process. The specific transfer method can refer to the prior art, and will not be described or limited herein.

[0129] In this embodiment, the light-transmissive protective structure is arranged on the light-emitting element body before the light-emitting element is transferred to the driving substrate. The light-transmissive protective structure can protect the first light-out surface, avoiding damage to the first light-out surface during the transfer process. Even if the light-blocking layer preparation and patterning process need to be performed after the light-emitting element is transferred, the presence of the light-transmissive protective structure can avoid direct contact between the light-blocking material and the light-emitting element body, and avoid the problem of residual light-blocking material on the first light-out surface of the light-emitting element body in the related art, thereby ensuring the light-emitting efficiency of the light-emitting element.

[0130] ​The present invention does not limit the specific preparation process of the light-transmitting protective structure. Several preparation methods of the light-transmitting protective structure are described below by way of example.

[0131] For example, Figure 20 This is a flowchart illustrating a method for preparing a light-transmitting protective structure according to an embodiment of the present invention. Figure 21 for Figure 20 The schematic diagram of the preparation method shown can be referred to. Figure 20 and Figure 21 The above embodiment (S120) can be further refined into the following steps:

[0132] S1201. Fabricate the light-emitting element body in the carrier substrate.

[0133] refer to Figure 21 In Figure (a), the carrier substrate 6 can be a silicon wafer or a silicon chip. The carrier substrate 6 serves as the growth substrate for the light-emitting element body 20, and multiple light-emitting element bodies 20 are fabricated on the carrier substrate 6. Among them, the light-emitting layer 201 of the light-emitting element body 20 is close to the carrier substrate 6, and the electrode 202 is located on the side of the light-emitting layer 201 away from the carrier substrate 6. That is, the first light-emitting surface 20a of the light-emitting element body 20 faces the carrier substrate 6.

[0134] The method for preparing the light-emitting element body 20 is not limited, and those skilled in the art can set it according to actual needs.

[0135] S1202, Provide a first transfer substrate and transfer the light-emitting element body to the first transfer substrate in such a way that the first light-emitting surface is away from the first transfer substrate.

[0136] refer to Figure 21 Figure (b) shows a first transfer substrate 7, on one side of which a first release adhesive layer 8 may be provided. After aligning the carrier substrate 6 with the first transfer substrate 7, the light-emitting element body 20 on the carrier substrate 6 is transferred to the first transfer substrate 7, wherein the electrode 202 of the light-emitting element body 20 is fixed to the first release adhesive layer 8.

[0137] The multiple light-emitting element bodies 20 on the carrier substrate 6 can be of the same color, and the light-emitting element bodies 20 transferred to the first transfer substrate 7 in this step can also be of the same color. The process of transferring the light-emitting element bodies 20 from the carrier substrate 6 to the first transfer substrate 7 can be defined as the first transfer process.

[0138] S1203. A first light-transmitting protective layer is prepared on at least one side of the light-emitting element body away from the first transfer substrate.

[0139] Further, refer to Figure 21In the middle (c) figure, the first light-transmissive protective layer 9 can be prepared by a coating process, and the first light-transmissive protective layer 9 covers the light-emitting element body 20 and the exposed first release adhesive layer 8 between adjacent light-emitting element bodies 20. The first light-transmissive protective layer 9 can be prepared by using a resin material with high light transmittance, for example, PDMS, but is not limited thereto.

[0140] S1204, providing a first mask and patterning the first light-transmissive protective layer by the first mask to prepare a light-transmissive protective structure on the first light-emitting surface of the light-emitting element body.

[0141] The pattern design of the first mask matches the arrangement of the light-emitting element body 20 on the first transfer substrate 7. Referring to Figure 21 In the middle (d) figure, the first light-transmissive protective layer 9 is patterned by using the first mask to remove the first light-transmissive protective layer 9 in the region of the first release adhesive layer 8 where no light-emitting element body 20 is arranged, and to retain the first light-transmissive protective layer 9 on the first light-emitting surface 20a of the light-emitting element body 20, and the retained part of the first light-transmissive protective layer 9 forms the light-transmissive protective structure 211. The patterning process can be a photolithography and etching process, which is not described or limited in the embodiments of the present application.

[0142] After S1204, other transfer processes are also included, and in the subsequent transfer processes, the light-transmissive protective structure 211 can play a protective role to avoid damage to the light-emitting element body 20.

[0143] An exemplary Figure 22 Another process flow for preparing a light-transmissive protective structure provided by the embodiments of the present application is shown in Figure 23 For Figure 22 The schematic diagram of the preparation method is shown in Figure 22 and Figure 23 (S120) in the above embodiments can be further divided into the following steps:

[0144] S1205, preparing the light-emitting element body in the carrier substrate.

[0145] S1206, providing a first transfer substrate and transferring the light-emitting element body to the first transfer substrate with the first light-emitting surface facing away from the side of the first transfer substrate.

[0146] The specific implementation of S1205 and S1206 can refer to S1201 and S1202 in the above embodiments, which will not be described here.

[0147] S1207, providing a second transfer substrate and preparing a second light-transmissive protective layer on one side of the second transfer substrate.

[0148] Referring to Figure 23In the (c) drawing, a second transfer substrate 11 is provided, and the second transfer substrate 11 can be provided with a second release adhesive layer 12. The second release adhesive layer 12 can be coated with a second transparent protective layer 13 by coating process. The second transparent protective layer 13 and the first transparent protective layer 9 in the above embodiment can be made of the same material.

[0149] In S1208, the light emitting element body is transferred to the second transfer substrate in a manner that the first light emitting surface faces the second transparent protective layer.

[0150] Further, referring to Figure 23 In the (d) drawing, the first transfer substrate 7 is aligned with the second transfer substrate 11, and the light emitting element body 20 on the first transfer substrate 7 is transferred to the second transfer substrate 11, wherein the first light emitting surface 20a of the light emitting element body 20 is fixed with the second transparent protective layer 13. The process of transferring the light emitting element body 20 from the first transfer substrate 7 to the second transfer substrate 11 can be defined as a second transfer process. In the second transfer process, light emitting element bodies 20 of different colors can be transferred to the same second transfer substrate 11, so as to realize the transfer integration of light emitting elements 2 of different colors.

[0151] In S1209, the second transparent protective layer is patterned by taking the light emitting element body as a mask, so as to prepare a transparent protective structure on the first light emitting surface of the light emitting element body.

[0152] Further, referring to Figure 23 In the (e) drawing, in the embodiment, along the thickness direction Z of the second transfer substrate 11, the second transparent protective layer 13 is located between the light emitting element body 20 and the second transfer substrate 11, and the first light emitting surface 20a faces the second transparent protective layer 13. In this way, the light emitting element body 20 can be directly used as a mask, and the second transparent protective layer 13 is patterned under the mask effect of the light emitting element body 20. The part of the second transparent protective layer 13 not covered by the light emitting element body 20 is removed, and the part of the second transparent protective layer 13 covered by the light emitting element body 20 remains to form a transparent protective structure 211.

[0153] In this arrangement, the mask is not needed in the process of patterning the second transparent protective layer 13. On the one hand, there is no alignment error between the mask and the light emitting element body 20 caused by process deviation, so as to ensure the alignment accuracy between the transparent protective structure 211 and the light emitting element body 20. On the other hand, the cost of the mask can be reduced.

[0154] Exemplarily, Figure 24 A flowchart of another method for preparing a transparent protective structure provided by the embodiment of the present application is shown in Figure 25 For Figure 24 The schematic diagram of the preparation method is shown in Figure 24 andFigure 25 The above embodiment (S120) can be further refined into the following steps:

[0155] S1210. Fabricate the light-emitting element body in the carrier substrate.

[0156] S1211. A first transfer substrate is provided and the light-emitting element body is transferred to the first transfer substrate in such a way that the first light-emitting surface is away from the first transfer substrate.

[0157] S1212, Provide a second transfer substrate and prepare a second light-transmitting protective layer on one side of the second transfer substrate.

[0158] S1213. The light-emitting element body is transferred to the second transfer substrate with the first light-emitting surface facing the second light-transmitting protective layer.

[0159] For specific implementation methods of S1210 to S1213, please refer to S1205 to S1208 in the above embodiments.

[0160] S1214. A third light-transmitting protective layer is prepared on the side of the light-emitting element body away from the second transfer substrate.

[0161] Further, refer to Figure 25 In Figure (e), after the light-emitting element body 20 is transferred to the second transfer substrate 11, a third light-transmitting protective layer 14 can be prepared on the side of the second transfer substrate 11 facing the light-emitting element body 20. The third light-transmitting protective layer 14 covers the light-emitting element body 20 and the second light-transmitting protective layer 13. The third light-transmitting protective layer 14 and the second light-transmitting protective layer 13 can be prepared from the same material.

[0162] S1215. A second photomask is provided and a second and a third light-transmitting protective layer are patterned using the second photomask to prepare a light-transmitting protective structure on the first light-emitting surface and the side light-emitting surface of the light-emitting element body.

[0163] The graphic design of the second mask matches the arrangement of the light-emitting element body 20 on the second transfer substrate 11. (Reference) Figure 25 In Figure (f), the second light-transmitting protective layer 13 and the third light-transmitting protective layer 14 are patterned using a second mask to remove a portion of the second light-transmitting protective layer 13 and the third light-transmitting protective layer 14 in the area where the light-emitting element body 20 is not located, while retaining a portion of the second light-transmitting protective layer 13 that contacts the first light-emitting surface 20a of the light-emitting element body 20 and a portion of the third light-transmitting protective layer 14 that contacts the side light-emitting surface 20b of the light-emitting element body 20. The retained second light-transmitting protective layer 13 and the third light-transmitting protective layer 14 form the light-transmitting protective structure 211.

[0164] In the embodiment, the light-transmissive protection structure 211 can simultaneously protect the first light-out surface 20a and the side light-out surface 20b. When the light-transmissive protection structure 211 covers the side light-out surface 20b, the light emitted by the side light-out surface 20b of the light-emitting element 2 can also be emitted through the light-transmissive protection structure 211, thereby improving the light-emitting efficiency of the light-emitting element 2.

[0165] The above Figures 20-25 In the embodiment, (S130) can be refined as: after the transfer substrate (the first transfer substrate and / or the second transfer substrate) is aligned with the driving substrate, the light-emitting element is transferred to the driving substrate in a manner that the electrode of the light-emitting element body faces the driving substrate, so as to fix the light-emitting element and the driving substrate.

[0166] The light-transmissive protection structure can be a transparent protection structure or a color filter protection structure. When the light-transmissive protection structure is the transparent protection structure, the transparent protection structures corresponding to the light-emitting element bodies of different colors are the same. When the light-transmissive protection structure is the color filter protection structure, the color filter protection structures corresponding to the light-emitting element bodies of different colors are different.

[0167] Optionally, in possible embodiments, the driving substrate includes a driving circuit and a driving signal line, and the driving circuit is electrically connected with the driving signal line and the light-emitting element body respectively; after (S130) in the above embodiment, the method further includes the following steps: a first light-shielding structure is prepared from a side of the light-emitting element away from the driving substrate, the first light-shielding structure covers the driving circuit and the driving signal line; and the first light-shielding structure exposes the side light-out surface, or the first light-shielding structure covers at least part of the side light-out surface.

[0168] Figure 26 Another flowchart of a preparation method of a display panel provided in an embodiment of the present application is shown in Figure 27 For Figure 26 The schematic diagram of the preparation method is shown in Figure 26 and Figure 27 The preparation method includes:

[0169] S210, providing a driving substrate.

[0170] S220, providing a light-emitting element body and preparing a light-transmissive protection structure at least on a first light-out surface of the light-emitting element body.

[0171] S230, transferring the light-emitting element to a side of the driving substrate.

[0172] The specific implementation of S210-S230 can refer to the above embodiments, which will not be described here again.

[0173] S240, preparing a first light-shielding structure from a side of the light-emitting element away from the driving substrate, the first light-shielding structure covering the driving circuit and the driving signal line.

[0174] ReferenceFigure 27 In Figures (d) to (e), a first initial light-shielding layer 15 can be prepared on the side of the light-emitting element 2 away from the driving substrate 1. The first initial light-shielding layer 15 covers the light-emitting element 2 and the driving substrate 1. Subsequently, the first initial light-shielding layer 15 can be patterned using a fourth mask to at least remove the first initial light-shielding layer 15 on the side of the first light-emitting surface 20a of the light-emitting element body 20, while retaining a portion of the first initial light-shielding layer 15 covering the driving circuit (not shown in the figure) and the driving signal line 103. The retained first initial light-shielding layer 15 forms the first light-shielding structure 4.

[0175] It should be noted that patterning the first initial light-shielding layer 15 may damage the light-transmitting protective structure 211, causing... Figure 27 The thickness of the light-transmitting protective structure 211 shown in Figure (e) may be less than the thickness of the light-transmitting protective structure 211 shown in Figure (d) of Figure 27.

[0176] Among them, the first light-shielding structure 4 can expose the side light-emitting surface 20b (e.g. Figure 27 (As shown), or, the first light-shielding structure 4 may cover at least part of the side-emitting light surface 20b. When patterning the first initial light-shielding layer 15, the first initial light-shielding layer 15 surrounding the first light-emitting surface 20a of the light-emitting element body 20 and the side of the light-emitting element 2 may be removed, so that the remaining first light-shielding structure 4 exposes the side-emitting light surface 20b; or, only the first initial light-shielding layer 15 on the first light-emitting surface 20a of the light-emitting element body 20 may be removed, so that the first light-shielding structure 4 covers the side-emitting light surface 20b.

[0177] Optionally, in some other embodiments, prior to (step two) in the above embodiments, the following may also be performed: providing a light-emitting element body and preparing a light-shielding protective structure on the side light-emitting surface of the light-emitting element body.

[0178] Figure 28 The flowchart illustrates another method for manufacturing a display panel according to an embodiment of the present invention. Figure 29 for Figure 28 The diagram shows a further refinement of the preparation method described in the above embodiments. Figure 28 and Figure 29 The preparation method shown specifically includes the following steps:

[0179] S310 provides a drive board.

[0180] S320, Provide a light-emitting element body and prepare a light-shielding protection structure on the side light-emitting surface of the light-emitting element body.

[0181] like Figure 29As shown in FIG. b, the light shielding protection structure 214 can be formed on at least part of the side light emitting surface 20b of the light emitting element body 20, and the light shielding protection structure 214 is made of a light shielding material and can be arranged one by one corresponding to the light emitting element body 20.

[0182] S330, transferring the light emitting element to the side of the driving substrate.

[0183] By preparing the light shielding protection structure on the side light emitting surface of the light emitting element body, the light shielding protection structure can block the side light emitting of the light emitting element, so that the light is emitted from the first light emitting surface, thereby reducing the large viewing angle deviation problem caused by the side light emitting. In addition, after the light emitting element body is transferred, there is no need to additionally prepare a light shielding layer, which can remove the preparation and patterning process of the light shielding layer, thereby simplifying the process and fundamentally avoiding the problem of residual light shielding material on the first light emitting surface and damage to the light emitting element.

[0184] Exemplarily, Figure 30 A flow chart of a preparation method of a light shielding protection structure provided by an embodiment of the present application, Figure 31 For Figure 30 The schematic diagram of the preparation method shown in FIG. b can refer to Figure 30 and Figure 31 (S320) in the above embodiment can be refined as follows:

[0185] S3201, preparing a light emitting element body in a carrier substrate.

[0186] S3202, providing a first transfer substrate and transferring the light emitting element body to the first transfer substrate with the first light emitting surface facing away from the side of the first transfer substrate.

[0187] The specific implementation of S3201 and S3202 is the same as that in the above embodiment, which will not be described here again.

[0188] S3203, providing a second transfer substrate and transferring the light emitting element body to the second transfer substrate with the first light emitting surface facing the side of the second transfer substrate.

[0189] As Figure 31 As shown in FIG. c, a second transfer substrate 11 is provided, and one side of the second transfer substrate 11 can be provided with a second release adhesive layer 12. After aligning the first transfer substrate 7 and the second transfer substrate 11, the light emitting element body 20 on the first substrate is transferred to the second transfer substrate 11, wherein the first light emitting surface 20a of the light emitting element body 20 is fixed with the second release adhesive layer 12.

[0190] S3204, preparing a light shielding protection layer on the side of the light emitting element body away from the second transfer substrate.

[0191] Further, referring to FIG. 12(d), the light-shielding protective layer 16 can be prepared by evaporation or other methods. The light-shielding protective layer 16 covers the luminescent element body 20 and the exposed second release adhesive layer 12 between adjacent luminescent element bodies 20. The light-shielding protective layer 16 can be prepared by using black material, such as carbon black system material, but is not limited thereto. Figure 31

[0192] S3205, a third mask is provided and the light-shielding protective layer is patterned by the third mask to prepare a light-shielding protective structure on the side light-out surface of the luminescent element body.

[0193] The pattern design of the third mask should match the arrangement of the side light-out surface 20b of the luminescent element body 20 on the second transfer substrate 11. Referring to FIG. 12(e), the light-shielding protective layer 16 is patterned by using the third mask to remove the light-shielding protective layer 16 above the first light-out surface 20a of the luminescent element body 20 and between the side light-out surfaces 20b of adjacent two luminescent element bodies 20, and to retain the light-shielding protective layer 16 covering the side light-out surface 20b of the luminescent element body 20. The retained part of the light-shielding protective layer 16 forms the light-shielding protective structure 214. Figure 31

[0194] Optionally, the driving substrate includes a driving circuit and a driving signal line, and the driving circuit is electrically connected to the driving signal line and the luminescent element body, respectively. Before the step (S330) in the above embodiment, the method further includes: preparing a second light-shielding structure on one side of the driving substrate, the second light-shielding structure covering the driving circuit and the driving signal line, and the light-shielding protective structure is independently arranged from the second light-shielding structure.

[0195] Figure 32 FIG. 13 is a flowchart of another method for preparing a display panel according to an embodiment of the present application, Figure 33 FIG. 14 is a schematic diagram of the method for preparing a display panel according to an embodiment of the present application, Figure 32 FIG. 15 is a schematic diagram of the method for preparing a display panel according to an embodiment of the present application, Figure 32 FIG. 16 is a schematic diagram of the method for preparing a display panel according to an embodiment of the present application, Figure 33 The method for preparing a display panel according to an embodiment of the present application includes the following steps:

[0196] S410, a driving substrate is provided.

[0197] S420, a luminescent element body is provided and a light-shielding protective structure is prepared on a side light-out surface of the luminescent element body.

[0198] S421, a second light-shielding structure is prepared on one side of the driving substrate, the second light-shielding structure covering the driving circuit and the driving signal line, and the light-shielding protective structure is independently arranged from the second light-shielding structure.

[0199] FIG. 17 is a schematic diagram of the method for preparing a display panel according to an embodiment of the present application, Figure 33 ​​As shown in Figures (c) and (d), a full-layer second initial light-shielding layer 17 can be prepared on one side of the driving substrate 1 using processes such as vapor deposition. Subsequently, the second initial light-shielding layer 17 can be patterned using a fifth mask to at least remove the portion of the second initial light-shielding layer 17 that overlaps with the driving circuit (not shown) and the driving signal line 103, retaining the portion of the second initial light-shielding layer 17 that covers the driving circuit and the driving signal line 103. The retained second initial light-shielding layer 17 forms the second light-shielding structure 5. The light-shielding protection structure 214 and the first light-shielding structure 4 are independent of each other and do not contact each other.

[0200] This step can be performed after S420 and before S430, or after S410 and before S420. This embodiment of the invention does not limit the execution of this step.

[0201] S430, Transfer the light-emitting element to one side of the driving substrate.

[0202] In the embodiments of the preparation method of the present invention, the light-emitting element body is inverted trapezoidal in some of the corresponding figures, and is upright trapezoidal in some of the embodiments. The shape of the light-emitting element body is only an example and not a limitation of the present invention.

[0203] The method for preparing a display panel provided in this embodiment of the invention includes all the technical features and corresponding beneficial effects of the display panel provided in any embodiment of the invention. For any content not described in detail in the preparation method, please refer to the corresponding embodiment of the display panel.

[0204] Based on the same concept, embodiments of the present invention also provide a display device. Figure 34 This is a schematic diagram of a display device provided in an embodiment of the present invention. Figure 34 As shown, the display device includes the display panel 100 provided in any embodiment of the present invention. Therefore, the display device provided in the embodiments of the present invention has the corresponding beneficial effects of the display panel provided in the embodiments of the present invention, which will not be described again here. For example, the display device may be an electronic device such as a mobile phone, computer, smart wearable device (e.g., smartwatch), and in-vehicle display device, and the embodiments of the present invention do not limit it to this.

[0205] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A display panel, characterized by, The display panel comprises a driving substrate and a light-emitting element located on one side of the driving substrate; The light-emitting element comprises a light-emitting element body and a protection structure, the protection structure contacts and covers a light-emitting surface of the light-emitting element body, the light-emitting surface comprises a first light-emitting surface and / or a side light-emitting surface, the first light-emitting surface is a surface of the light-emitting element body away from the driving substrate, and the side light-emitting surface is located on a plane intersecting with a plane on which the first light-emitting surface is located; The protection structure in at least part of the light-emitting element is independently arranged; The protection structure comprises a light-transmitting protection structure, and the light-transmitting protection structure covers at least the first light-emitting surface; The refractive index of the light-transmitting protection structure is less than the refractive index of the light-emitting element body; The light-emitting element body comprises a first color light-emitting element body, a second color light-emitting element body and a third color light-emitting element body, the refractive index of the first color light-emitting element body is greater than the refractive index of the second color light-emitting element body and / or the third color light-emitting element body; The light-transmitting protection structure comprises a first protection structure, a second protection structure and a third protection structure, the first protection structure contacts and covers a light-emitting surface of the first color light-emitting element body, the second protection structure contacts and covers a light-emitting surface of the second color light-emitting element body, and the third protection structure contacts and covers a light-emitting surface of the third color light-emitting element body; The refractive index of the first protection structure is greater than the refractive index of the second protection structure and / or the third protection structure.

2. The display panel of claim 1, wherein, The display panel further comprises an encapsulation layer located on a side of the light-transmitting protection structure away from the driving substrate; The refractive index of the light-transmitting protection structure is greater than the refractive index of the encapsulation layer.

3. The display panel of claim 1, wherein, The display panel further comprises an encapsulation layer located on a side of the light-transmitting protection structure away from the driving substrate; The light-transmitting protection structure is different from the encapsulation layer in material.

4. The display panel of claim 1, wherein, The light-transmitting protection structure comprises a first position and a second position, and the thickness of the light-transmitting protection structure at the first position is not equal to the thickness of the light-transmitting protection structure at the second position in the thickness direction of the display panel.

5. The display panel of claim 4, wherein, The light-emitting surface of the light-transmitting protection structure is protruded towards a side away from the driving substrate.

6. The display panel of claim 1, wherein, The light-transmitting protection structure comprises a transparent protection structure; or the light-transmitting protection structure comprises a color filter protection structure.

7. The display panel of claim 1, wherein, The light-transmitting protection structure covers the first light-emitting surface and the side light-emitting surface.

8. The display panel of claim 1, wherein, The driving substrate comprises a driving circuit and a driving signal line, and the driving circuit is electrically connected with the driving signal line and the light-emitting element respectively; The display panel further comprises a first light-shielding structure, the first light-shielding structure covers the driving circuit and the driving signal line, and the first light-shielding structure exposes the side light-emitting surface or covers at least part of the side light-emitting surface.

9. The display panel of claim 1, wherein, The protection structure comprises a light-shielding protection structure, and the light-shielding protection structure covers the side light-emitting surface.

10. The display panel of claim 9, wherein, The driving substrate comprises a driving circuit and a driving signal line, and the driving circuit is electrically connected with the driving signal line and the light-emitting element respectively; The display panel further comprises a second light-shielding structure, and the second light-shielding structure covers the driving circuit and the driving signal line. The light-shielding protection structure is independently arranged from the second light-shielding structure.

11. The display panel of claim 1, wherein, The first light-out surface comprises a plurality of microstructures.

12. The display panel of claim 1, wherein, The light-out surface further comprises a second light-out surface, which is located on the side of the first light-out surface close to the driving substrate. In the thickness direction of the display panel, the first light-out surface covers the second light-out surface. Alternatively, the second light-out surface covers the first light-out surface.

13. A method for manufacturing a display panel, for manufacturing a display panel according to any one of claims 1 to 12, characterized in that, Comprising: providing a driving substrate; transferring the light-emitting element to the side of the driving substrate; The light-emitting element comprises a light-emitting element body and a protection structure, the protection structure contacts and covers the light-out surface of the light-emitting element body, the light-out surface comprises a first light-out surface and / or a side light-out surface, the first light-out surface is the surface of the light-emitting element body away from the driving substrate, the plane of the side light-out surface intersects with the plane of the first light-out surface; at least part of the protection structure in the light-emitting element is independently arranged.

14. The method of claim 13, wherein, Before transferring the light-emitting element to the side of the driving substrate, further comprising: providing a light-emitting element body and preparing a light-transmitting protection structure at least on the first light-out surface of the light-emitting element body.

15. The method of claim 14, wherein, Providing a light-emitting element body and preparing a light-transmitting protection structure at least on the first light-out surface of the light-emitting element body, comprising: preparing a light-emitting element body in a carrier substrate; providing a first transfer substrate and transferring the light-emitting element body to the first transfer substrate with the first light-out surface away from the side of the first transfer substrate; preparing a first light-transmitting protection layer at least on the side of the light-emitting element body away from the first transfer substrate; providing a first mask and patterning the first light-transmitting protection layer through the first mask to prepare a light-transmitting protection structure on the first light-out surface of the light-emitting element body.

16. The method of claim 14, wherein, Providing a light-emitting element body and preparing a light-transmitting protection structure at least on the first light-out surface of the light-emitting element body, comprising: preparing a light-emitting element body in a carrier substrate; providing a first transfer substrate and transferring the light-emitting element body to the first transfer substrate with the first light-out surface away from the side of the first transfer substrate; providing a second transfer substrate and preparing a second light-transmitting protection layer on the side of the second transfer substrate; transferring the light-emitting element body to the second transfer substrate with the first light-out surface facing the second light-transmitting protection layer; patterning the second light-transmitting protection layer with the light-emitting element body as a mask to prepare a light-transmitting protection structure on the first light-out surface of the light-emitting element body.

17. The preparation method according to claim 14, characterized in that, Providing a light-emitting element body and preparing a light-transmitting protection structure at least on the first light-out surface of the light-emitting element body, comprising: preparing a light-emitting element body in a carrier substrate; providing a first transfer substrate and transferring the light-emitting element body to the first transfer substrate with the first light-out surface away from the side of the first transfer substrate; providing a second transfer substrate and preparing a second light-transmitting protection layer on the side of the second transfer substrate; transferring the light-emitting element body to the second transfer substrate with the first light-out surface facing the second light-transmitting protection layer; preparing a third light-transmitting protection layer on the side of the light-emitting element body away from the second transfer substrate; A second mask is provided and the second light-transmissive protective layer and the third light-transmissive protective layer are patterned by the second mask to form light-transmissive protective structures on the first light-out surface and the side light-out surface of the light-emitting element body.

18. The method of claim 14, wherein, The driving substrate comprises a driving circuit and a driving signal line, and the driving circuit is electrically connected to the driving signal line and the light-emitting element body, respectively. After the light-emitting element is transferred to the side of the driving substrate, the method further comprises: A first light-blocking structure is formed on the side of the light-emitting element away from the driving substrate, and the first light-blocking structure covers the driving circuit and the driving signal line. The first light-blocking structure exposes the side light-out surface, or the first light-blocking structure covers at least part of the side light-out surface.

19. The method of claim 13, wherein, Before the light-emitting element is transferred to the side of the driving substrate, the method further comprises: A light-emitting element body is provided, and a light-blocking protective structure is formed on a side light-out surface of the light-emitting element body.

20. The method of claim 19, wherein, A light-emitting element body is provided, and a light-blocking protective structure is formed on a side light-out surface of the light-emitting element body, which comprises: A light-emitting element body is formed in a carrier substrate; A first transfer substrate is provided, and the light-emitting element body is transferred to the first transfer substrate with the first light-out surface facing away from the side of the first transfer substrate; A second transfer substrate is provided, and the light-emitting element body is transferred to the second transfer substrate with the first light-out surface facing toward the side of the second transfer substrate; A light-blocking protective layer is formed on the side of the light-emitting element body away from the second transfer substrate; A third mask is provided, and the light-blocking protective layer is patterned by the third mask to form a light-blocking protective structure on the side light-out surface of the light-emitting element body.

21. The method of claim 20, wherein, The driving substrate comprises a driving circuit and a driving signal line, and the driving circuit is electrically connected to the driving signal line and the light-emitting element body, respectively. Before the light-emitting element is transferred to the side of the driving substrate, the method further comprises: A second light-blocking structure is formed on the side of the driving substrate, and the second light-blocking structure covers the driving circuit and the driving signal line, and the light-blocking protective structure is independently arranged from the second light-blocking structure.

22. A display device comprising: The display panel of any one of claims 1-12.

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