CN114512505A - Display backplane and display device - Google Patents

Abstract

The embodiment of the present invention discloses a display backplane and a display device; the display backplane includes a driving circuit layer, a plurality of light-emitting units arranged at intervals on the driving circuit layer, and a light-emitting unit located between two adjacent light-emitting units. A convex lens structure, and an optical film located on the convex lens structure and the light-emitting unit, the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side closest to the convex lens structure of the optical film; A convex lens structure is arranged between the two light-emitting units, and the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side of the optical film closest to the convex lens structure, so that the light between the two adjacent light-emitting units is concentrated and emitted, which improves the The problem that the brightness of the gap portion between two adjacent light-emitting units is relatively dark improves the technical problem that the display backplane presents alternate distribution of bright areas and dark areas, and improves the light-emitting display effect of the display backplane.

Description

Display backplane and display device

technical field

The invention relates to the field of display, in particular to a display backplane and a display device.

Background technique

In recent years, the light-emitting display effect of the display backplane has been paid more and more attention by consumers. There is a gap between two adjacent light-emitting units of the display backplane, and the light-emitting angle of each light-emitting unit is limited, resulting in two adjacent light-emitting units. The brightness of the gap part of the unit will be darker, the brightness of the light-emitting unit is a bright area, and the gap between two adjacent light-emitting units is a dark area, so that the entire display backplane presents a phenomenon of alternating bright and dark areas.

Therefore, there is an urgent need for a display backplane and a display device to solve the above-mentioned technical problems.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a display backplane and a display device, which can alleviate the technical problem that the current display backplane exhibits alternate distribution of bright areas and dark areas.

An embodiment of the present invention provides a display backplane, including:

drive circuit layer;

a plurality of light-emitting units arranged at intervals, located on the driving circuit layer;

A plurality of convex lens structures are located on the driving circuit layer, and one of the convex lens structures is located between two adjacent light-emitting units;

an optical film on the convex lens structure and the light emitting unit;

Wherein, the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side of the optical film closest to the convex lens structure.

Preferably, the convex lens structure and the light-emitting unit are arranged in the same layer; the optical film includes at least two layers on the convex lens structure and the light-emitting unit; wherein, from the light-emitting unit to the far away In the direction of one side of the driving circuit layer, the refractive index of the film layer of the optical film gradually decreases.

Preferably, in the optical film, the difference between the refractive index of the film layer on the side closest to the convex lens structure and the refractive index of the film layer on the side farthest from the convex lens structure is smaller than the refractive index of the film layer closest to the convex lens structure The difference between the refractive index of the film layer on one side and the refractive index of the convex lens structure.

Preferably, the optical film further includes a plurality of scattering particles located in any layer of the optical film.

Preferably, any layer of the optical film further comprises a matrix; wherein, the refractive index of the scattering particles is different from the refractive index of the corresponding matrix.

Preferably, the refractive index of the scattering particles is greater than the refractive index of the corresponding matrix.

Preferably, at least one of the scattering particles includes a plurality of depressions on the surface of the scattering particles.

Preferably, at least one of the scattering particles includes a particle body and at least one through hole, the through hole penetrates the particle body, and the through hole is filled with the matrix in the corresponding film layer.

Preferably, the display backplane further includes a reflective sheet located between the convex lens structure and the driving circuit layer.

An embodiment of the present invention further provides a display device, including any of the above-mentioned display backplanes and a device main body, wherein the display backplane and the device main body are combined into one body.

Beneficial effects of the present invention: In the embodiment of the present invention, a convex lens structure is arranged between two adjacent light-emitting units, and the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side closest to the convex lens structure of the optical film. The light between the two light-emitting units is concentrated and emitted, which improves the problem that the brightness of the gap between two adjacent light-emitting units is dim, improves the technical problem that the display backplane presents alternating bright areas and dark areas, and improves the display backplane. luminous display effect.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a first structure of a display backplane provided by an embodiment of the present invention;

2 is a schematic structural diagram of a second structure of a display backplane provided by an embodiment of the present invention;

3 is a schematic structural diagram of a third structure of a display backplane provided by an embodiment of the present invention;

4 is an enlarged schematic diagram of the first structure of the scattering particles of the display backplane provided by an embodiment of the present invention;

5 is an enlarged schematic diagram of a second structure of the scattering particles of the display backplane provided by an embodiment of the present invention;

6 is an enlarged schematic diagram of a third structure of the scattering particles of the display backplane provided by an embodiment of the present invention;

7 is an enlarged schematic diagram of a fourth structure of scattering particles of a display backplane provided by an embodiment of the present invention;

8 is a schematic structural diagram of a fourth structure of a display backplane provided by an embodiment of the present invention;

9 is a schematic diagram of the effect of a display backplane provided by an embodiment of the present invention;

10 is a schematic structural diagram of a first structure of a display device provided by an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a second structure of a display device provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention. In the present invention, unless otherwise stated, the directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the direction of the drawing in the accompanying drawings. ; while "inside" and "outside" refer to the outline of the device.

In recent years, the light-emitting display effect of the display backplane has been paid more and more attention by consumers. There is a gap between two adjacent light-emitting units of the display backplane, and the light-emitting angle of each light-emitting unit is limited, resulting in two adjacent light-emitting units. The brightness of the gap part of the unit will be darker, the brightness of the light-emitting unit is a bright area, and the gap between two adjacent light-emitting units is a dark area, so that the entire display backplane presents a phenomenon of alternating bright and dark areas.

Referring to FIG. 1 to FIG. 9, an embodiment of the present invention provides a display backplane 100, including:

driving circuit layer 200;

A plurality of light-emitting units 300 arranged at intervals are located on the driving circuit layer 200;

a plurality of convex lens structures 400 are located on the driving circuit layer 200, and one of the convex lens structures 400 is located between two adjacent light emitting units 300;

The optical film 500 is located on the convex lens structure 400 and the light-emitting unit 300;

Wherein, the refractive index of the convex lens structure 400 is smaller than the refractive index of the film layer on the side of the optical film 500 closest to the convex lens structure 400 .

In the embodiment of the present invention, a convex lens structure is arranged between two adjacent light-emitting units, and the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side of the optical film closest to the convex lens structure. The light emitted from the radiator is concentrated and emitted, which improves the problem that the brightness of the gap between two adjacent light-emitting units is dim, improves the technical problem that the display backplane presents alternate distribution of bright areas and dark areas, and improves the light-emitting display effect of the display backplane.

The technical solutions of the present invention will now be described with reference to specific embodiments.

In this embodiment, please refer to FIG. 1 and FIG. 2 , the display backplane 100 includes a driving circuit layer 200 , a plurality of light emitting units 300 disposed on the driving circuit layer 200 at intervals, and two adjacent light emitting units 300 . The convex lens structure 400 between the light emitting units 300, and the optical film 500 located on the convex lens structure 400 and the light emitting unit 300, the refractive index of the convex lens structure 400 is smaller than that of the optical film 500 closest to the convex lens structure Refractive index of the layer on the 400 side.

Wherein, the dashed arrows in FIG. 1 , FIG. 2 , FIG. 3 , and FIG. 8 represent schematic diagrams of light paths.

Please refer to (a) of FIG. 9 , if the solution of this embodiment is not adopted, there is currently a dark area between two adjacent light-emitting units 300 .

Please refer to (b) of FIG. 9 , one of the convex lens structures 400 is located between two adjacent light emitting units 300 , and the refractive index of the convex lens structure 400 is smaller than that of the optical film 500 on the side closest to the convex lens structure 400 When the light passes through the convex lens structure 400 and hits the optical film 500, the light is refracted from the low refractive index to the high refractive index film, and will be at the interface between the convex lens and the optical film 500. The refraction of the light convergence occurs, so that more light lines between two adjacent light-emitting units 300 are converged and emitted, and the brightness between the two adjacent light-emitting units 300 will increase, thereby weakening the difference between the two adjacent light-emitting units 300. The problem that the brightness of the gap portion between the two parts is relatively dark, thereby improving the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas, and improving the light-emitting display effect of the display backplane 100 .

In some embodiments, please refer to FIG. 2 , the convex lens structure 400 and the light emitting unit 300 are disposed in the same layer; the optical film 500 includes at least two layers on the convex lens structure 400 and the light emitting unit 300 film layer; wherein, in the direction from the light emitting unit 300 to the side away from the driving circuit layer 200, the refractive index of the film layer of the optical film 500 gradually decreases.

Referring to FIG. 2 , taking the optical film 500 including two layers as an example, the optical film 500 at least includes a first layer 510 located on the convex lens structure 400 and the light-emitting unit 300 , and a first layer 510 located on the convex lens structure 400 and the light-emitting unit 300 . The second layer 520 on the first layer 510 ; wherein the refractive index of the first layer 510 is greater than the refractive index of the second layer 520 .

The light emitting unit 300 emits light directly directed to the side away from the driving circuit layer 200. When passing through the first layer 510 and the second layer 520, the refractive index of the first layer 510 is greater than that of the first layer 510. The refractive index of the second layer 520, the light will be refracted in the first layer 510 and the second layer 520, thereby increasing the divergence angle of the light directly emitted by the light-emitting unit 300, increasing the display back The uniformity of the light of the panel 100 improves the problem that the brightness of the gap between two adjacent light-emitting units 300 is too dark, improves the technical problem that the display back panel 100 presents alternate distribution of bright areas and dark areas, and improves the light emission of the display back panel 100 display effect.

In some embodiments, referring to FIG. 8 , the optical film 500 may include multiple layers. For example, the optical film 500 further includes a third layer located on the side of the second layer 520 away from the first layer 510 . Layer 530, the refractive index of the third layer 530 is smaller than the refractive index of the second layer 520, which increases the divergence angle of light, increases the uniformity of the light of the display backplane 100, and improves the two adjacent light-emitting units 300. For the problem that the brightness of the gap portion between them is relatively dark, the number of film layers of the optical film 500 can be adjusted according to the actual situation, and the specific number is not limited here.

In some embodiments, in the optical film 500, the difference between the refractive index of the film with the largest refractive index and the refractive index of the film with the smallest refractive index is smaller than the refractive index of the film with the largest refractive index The difference between the ratio and the refractive index of the convex lens structure 400. That is, in the optical film 500, the difference between the refractive index of the film layer on the side closest to the convex lens structure 400 and the refractive index of the film layer on the side farthest from the convex lens structure 400 is smaller than the refractive index of the film layer on the side closest to the convex lens structure 400 The difference between the refractive index of the film layer on one side of the structure 400 and the refractive index of the convex lens structure 400 .

The convergent refraction effect of the light passing through the convex lens is greater than the divergent refraction effect of the light passing through the optical film 500 , so that more light lines between two adjacent light-emitting units 300 are converged and emitted, and the two adjacent light-emitting units The brightness between 300 will increase, thereby reducing the problem that the brightness of the gap between two adjacent light-emitting units 300 is dark, thereby improving the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas, and improving the display backplane. The light-emitting display effect of the board 100 is shown.

In some embodiments, referring to FIG. 3 , the optical film 500 further includes a plurality of scattering particles 600 located in any layer of the optical film 500 .

The scattering particles 600 are added to the optical film 500 to improve the degree of light divergence, increase the light uniformity of the display backplane 100 , and improve the problem that the brightness of the gap between two adjacent light-emitting units 300 is dim. The display backplane 100 presents a technical problem in that the bright areas and the dark areas are alternately distributed, which improves the light-emitting display effect of the display backplane 100 .

In some embodiments, any layer of the optical film 500 further includes a matrix; wherein, the refractive index of the scattering particles 600 is different from the refractive index corresponding to the matrix. The refractive indices of the scattering particles 600 and the matrix are different, and the light will also be refracted when passing through the surface between the matrix and the scattering particles 600, thereby improving the degree of light divergence, increasing the light uniformity of the display backplane 100, and at the same time. The refractive index of the optical film 500 can be adjusted by using the scattering particles 600 to adapt to different application scenarios, improve the problem that the brightness of the gap between two adjacent light-emitting units 300 is dark, and improve the display backplane 100 The technical problem of the alternate distribution of bright areas and dark areas improves the light-emitting display effect of the display backplane 100 .

In some embodiments, the refractive index of the scattering particles 600 is greater than the refractive index of the corresponding matrix. The material of the matrix can be an organic encapsulation material, such as silicone silica gel, however, the refractive index of the organic encapsulation material is generally small, and it is difficult to achieve a refractive index gradient, and the material of the scattering particles 600 can be inorganic particles, such as TiO ₂ , ZnS , ZrO ₂ , etc., thereby increasing the refractive index of the optical film 500, making it easier to realize the refractive index gradient of the optical film 500, helping to improve the degree of light divergence, increasing the light uniformity of the display backplane 100, and improving the The problem that the brightness of the gap portion between two adjacent light-emitting units 300 is relatively dark improves the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas, and improves the light-emitting display effect of the display backplane 100 .

In some embodiments, please refer to FIG. 4 , at least one of the scattering particles 600 is a solid particle.

The scattering particles 600 are solid particles, and the refractive index of the scattering particles 600 is different from the refractive index of the corresponding film layer, which increases the complexity of the optical structure of the optical film 500 layer, and enhances the display by utilizing the refractive index difference. The scattering effect of light when it strikes the scattering particles 600 increases the light uniformity of the display backplane 100 , improves the problem that the brightness of the gap between two adjacent light-emitting units 300 is dim, and improves the display backplane 100 The technical problem of alternate distribution of bright areas and dark areas is presented, and the light-emitting display effect of the display backplane 100 is improved.

In some embodiments, please refer to FIG. 5 , at least one of the scattering particles 600 includes a plurality of recesses 610 on the surface of the scattering particle 600 .

The recesses 610 can increase the degree of divergence of the light when it strikes the scattering particles 600 , improve the light scattering effect, increase the light uniformity of the display backplane 100 , and improve the gap between two adjacent light-emitting units 300 . The problem of low brightness is improved, and the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas is improved, and the light-emitting display effect of the display backplane 100 is improved.

In some embodiments, please refer to FIG. 6 , at least one of the scattering particles 600 includes a particle body 601 and at least one through hole 620 , the through hole 620 penetrates the particle body 601 , and the through hole 620 is filled with corresponding particles. the substrate of the membrane layer.

The particle main body 601 is penetrated by the through hole 620. When in contact with the film layer of the optical film 500, the matrix of the optical film 500 is filled in the through hole 620. The refractive index of the particle main body 601 is different from the refractive index of the corresponding film layer, which enhances the scattering effect of the display light when it strikes the scattering particles 600, increases the light uniformity of the display backplane 100, and improves the adjacent two. The problem that the brightness of the gap portion between the light-emitting units 300 is too dark can improve the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas, and improve the light-emitting display effect of the display backplane 100 .

In some embodiments, referring to FIG. 7 , at least one of the scattering particles 600 includes a particle body 601 and a cavity 630 located in the particle body 601 , and the refractive index of the medium in the cavity 630 is the same as that of the particle body. 601 has a different refractive index.

The particle body 601 wraps the cavity 630 and has a hollow structure when there is no filler. The particle body 601 is filled with media with different refractive indices of the particle body 601 , and the optical film 500 is added. Due to the complexity of the optical structure, the difference in refractive index is used to enhance the scattering effect of the display light when it strikes the scattering particles 600, increase the light uniformity of the display backplane 100, and improve the space between two adjacent light-emitting units 300. The problem that the brightness of the gap portion is relatively dark, the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas is improved, and the light-emitting display effect of the display backplane 100 is improved.

In some embodiments, in some embodiments, the scattering particles 600 including the cavity 630 are filled with a first gas or a first liquid, and the refractive index of the first gas is the same as that of the particle body 601 . The refractive indices are different, and the refractive index of the first liquid is different from the refractive index of the particle body 601 .

The difference in refractive index is used to enhance the scattering effect of the display light when it strikes the scattering particles 600 , increase the light uniformity of the display backplane 100 , and improve the brightness of the gap between two adjacent light-emitting units 300 . To solve the problem, the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas is improved, and the light-emitting display effect of the display backplane 100 is improved.

In some embodiments, the refractive index of the general gas is smaller than the refractive index of the solid-liquid, the refractive index of the first gas is smaller than the refractive index of the particle body 601 , and when the light is emitted from the particle body 601 to the cavity 630 , which is emitted from the side with the larger refractive index to the side with the smaller refractive index. When the incident angle is greater than the critical angle, the light will be totally reflected at the interface between the particle body 601 and the cavity 630 . In addition to the scattering effect when the scattering particles 600 are emitted, the utilization rate of light is improved, the light loss is reduced, the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas is improved, and the luminous display effect of the display backplane 100 is improved.

In some embodiments, in the optical film 500, the difference between the refractive index of the film with the highest refractive index and the refractive index of the film with the smallest refractive index is less than 0.48. In the experiment, the range of the extreme value difference of the refractive index can not only ensure the divergence of light, but also not easily cause excessive total reflection of light in the optical film 500, and improve the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas. The light-emitting display effect of the display backplane 100 is improved.

In some embodiments, please refer to FIG. 8 , the display backplane 100 further includes a reflective sheet 700 located between the convex lens structure 400 and the driving circuit layer 200 .

The utilization rate of the light emitted by the light-emitting unit 300 toward the driving circuit layer 200 is improved, so that more light lines between two adjacent light-emitting units 300 are converged and emitted, and the light lines between two adjacent light-emitting units 300 are concentrated and emitted. The brightness will increase, thereby reducing the problem that the brightness of the gap between the two adjacent light-emitting units 300 is dark, thereby improving the technical problem that the display backplane 100 presents alternate distribution of bright areas and dark areas, and improving the light emission of the display backplane 100 display effect.

In some embodiments, the light-emitting unit 300 may be a Mini LED or a Micro LED, which is not specifically limited herein.

In some embodiments, the convex lens structure 400 may be a transparent material, such as silicone silica gel, transparent optical glue, etc., which is only an example and not limited herein.

In some embodiments, in the direction from the edge of the display backplane 100 to the center of the display backplane 100 , the refractive index of the convex lens structure 400 increases gradually. To improve the brightness of the display light in the dark area in the center of the display backplane 100 , human vision generally focuses on the center area of the display backplane 100 , focusing on improving the display light in the center area, and improving the display effect to the greatest extent.

In some embodiments, in the direction from the center of the display backplane 100 to the edge of the display backplane 100 , the number of the recesses 610 gradually increases.

In a circle around the edge of the display backplane 100 , since there are no light-emitting units 300 at the periphery, the problem of dark areas becomes more and more serious. Increasing the number of recesses 610 in the direction of the edge is beneficial to increase the amount of light hitting the scattering particles 600 . The degree of divergence can improve the light scattering effect, increase the light uniformity of the display backplane 100, improve the problem that the brightness of the gap between two adjacent light-emitting units 300 is dark, and improve the display backplane 100 to present bright areas and dark areas. The technical problem of alternating distribution improves the light-emitting display effect of the display backplane 100 .

In the embodiment of the present invention, a convex lens structure is arranged between two adjacent light-emitting units, and the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side of the optical film closest to the convex lens structure. The light emitted from the radiator is concentrated and emitted, which improves the problem that the brightness of the gap between two adjacent light-emitting units is dim, improves the technical problem that the display backplane presents alternate distribution of bright areas and dark areas, and improves the light-emitting display effect of the display backplane.

Referring to FIG. 10 , an embodiment of the present invention further provides a display device 10 , including a display backplane 100 and a device main body 20 as described above, and the display backplane 100 and the device main body 20 are combined into one.

For the specific structure of the display backplane 100 , please refer to any of the above-mentioned embodiments of the display backplane 100 and the accompanying drawings, which will not be repeated here.

The technical solutions of the present invention will now be described with reference to specific embodiments.

In some embodiments, please refer to FIG. 11 , the device body 20 may include a back frame 30 on the side of the driving circuit layer 200 away from the light emitting unit 300 , the back frame 30 is formed with an inner cavity, the The display backplane 100 is located in the inner cavity.

In some embodiments, please refer to FIG. 11 , the device body 20 may further include an optical functional layer 50 located on the side of the optical film 500 away from the light emitting unit 300 and a functional main body located on the optical functional layer 50 40 , the functional body 40 includes an array substrate 41 , a liquid crystal layer 42 , a color filter layer 43 , an upper polarizing layer 44 and a lower polarizing layer 45 .

In some embodiments, please refer to FIG. 11 , the optical functional layer 50 includes a quantum dot film 51 on the side of the optical film 500 away from the light emitting unit 300 , and a first diffusion on the quantum dot film 51 . layer 52 , a first light enhancement layer 53 on the first diffusion layer 52 , a second light enhancement layer 54 on the first light enhancement layer 53 , and a second diffusion layer on the second light enhancement layer 54 55.

In the embodiment of the present invention, a convex lens structure is arranged between two adjacent light-emitting units, and the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side of the optical film closest to the convex lens structure. The light emitted from the radiator is concentrated and emitted, which improves the problem that the brightness of the gap between two adjacent light-emitting units is dim, improves the technical problem that the display backplane presents alternate distribution of bright areas and dark areas, and improves the light-emitting display effect of the display backplane.

The embodiment of the present invention discloses a display backplane and a display device; the display backplane includes a driving circuit layer, a plurality of light-emitting units arranged at intervals on the driving circuit layer, and a light-emitting unit located between two adjacent light-emitting units. A convex lens structure, and an optical film located on the convex lens structure and the light-emitting unit, the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side closest to the convex lens structure of the optical film; A convex lens structure is arranged between the two light-emitting units, and the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side of the optical film closest to the convex lens structure, so that the light between the two adjacent light-emitting units is concentrated and emitted, which improves the The problem that the brightness of the gap between two adjacent light-emitting units is relatively dark improves the technical problem that the display backplane presents alternate distribution of bright areas and dark areas, and improves the light-emitting display effect of the display backplane.

A display backplane and a display device provided by the embodiments of the present invention have been described above in detail. The principles and implementations of the present invention are described with specific examples in this paper. The method of the invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. To sum up, the content of this description should not be construed as Limitations of the present invention.

Claims (10)

1. A display backplane, characterized in that, comprising: drive circuit layer; a plurality of light-emitting units arranged at intervals, located on the driving circuit layer; A plurality of convex lens structures are located on the driving circuit layer, and one of the convex lens structures is located between two adjacent light-emitting units; an optical film on the convex lens structure and the light emitting unit; Wherein, the refractive index of the convex lens structure is smaller than the refractive index of the film layer on the side of the optical film closest to the convex lens structure. 2. The display backplane according to claim 1, wherein the convex lens structure and the light emitting unit are arranged in the same layer; The optical film includes at least two film layers on the convex lens structure and the light-emitting unit; Wherein, in the direction from the light-emitting unit to the side away from the driving circuit layer, the refractive index of the film layer of the optical film gradually decreases. 3 . The display backplane according to claim 2 , wherein, in the optical film, the refractive index of the film layer on the side closest to the convex lens structure is the same as the refractive index of the film layer on the side farthest from the convex lens structure. 4 . The difference of the refractive index is smaller than the difference between the refractive index of the film layer on the side closest to the convex lens structure and the refractive index of the convex lens structure. 4 . The display backplane of claim 2 , wherein the optical film further comprises a plurality of scattering particles located in any film layer of the optical film. 5 . 5. The display backplane according to claim 4, wherein any film layer of the optical film further comprises a matrix; Wherein, the refractive index of the scattering particles is different from the refractive index of the corresponding matrix. 6 . The display backplane according to claim 5 , wherein the refractive index of the scattering particles is greater than the refractive index of the corresponding matrix. 7 . 7 . The display backplane of claim 6 , wherein at least one of the scattering particles comprises a plurality of depressions on the surface of the scattering particles. 8 . 8. The display backplane according to claim 6 or 7, wherein at least one of the scattering particles comprises a particle body and at least one through hole, the through hole penetrates the particle body, and the through hole is filled with a particle body. The matrix in which the corresponding film layer is located. 9 . The display backplane according to claim 1 , wherein the display backplane further comprises a reflective sheet located between the convex lens structure and the driving circuit layer. 10 . 10. A display device, characterized in that it comprises the display backplane and the device main body according to any one of claims 1 to 9, wherein the display backplane and the device main body are combined into one body.

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