Display device

Abstract

A display device (1000). By means of shaping the light pattern of backlight, directional backlight is realized; and by means of designing different light-emission principal optical axis angles at different positions on a backlight module (100), more light emitted from a backlight source (1) enters an eye-entry angle-of-view range of an optical machine module (200), thereby achieving a relatively high lighting-effect utilization rate and relatively good angle-of-view uniformity.

Description

A display device Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device. Background Art

[0002] When measuring VR / AR devices, it is generally necessary to consider parameters such as viewing angle, clarity, tracking accuracy, and comfort.

[0003] Clarity is primarily determined by resolution, refresh rate, and PPI. The refresh rate determines the smoothness of the image; higher refresh rates significantly reduce latency and artifacts. PPI is a key factor in determining clarity, and generally, the higher the better. High tracking accuracy and low latency foster a greater sense of immersion. As a wearable device, VR devices are difficult to use for extended periods if they lack overall comfort, significantly reducing the overall experience. In addition to the weight of the VR device, whether it supports pupil-to-object distance adjustment or can be used with glasses, as well as the device's material, also contribute significantly to comfort. SUMMARY OF THE INVENTION

[0004] The light emitted by the backlight source of current display devices has a poor inherent light pattern. When used in the VR field, the amount of light entering the eye is small after being combined with the optical machine module, the light utilization rate of the backlight source is low, and the uniformity of the display device is poor.

[0005] An object of the present invention is to provide a display device that can solve the problems of low light utilization rate of the backlight source of the existing display device and poor uniformity of the display device.

[0006] In order to solve the above problems, the present invention provides a display device, which includes: a backlight module, which includes a backlight source and a light type adjustment film arranged on the light output side of the backlight source; an optical machine module, which is arranged on the side of the light type adjustment film away from the backlight source, and the area of ​​the optical machine module is larger than the area of ​​the backlight module; wherein, the light type adjustment film includes an optical adjustment microstructure, and the angle between the main optical axis and the normal of the light emitted by the backlight source after passing through the light type adjustment film is centrally symmetrical; the angle between the main optical axis and the normal of the light emitted by the backlight source after passing through the light type adjustment film tends to increase from the center of the light type adjustment film to the edge of the light type adjustment film; or the angle between the main optical axis and the normal of the light emitted by the backlight source after passing through the light type adjustment film remains unchanged from the center of the light type adjustment film to the edge of the light type adjustment film.

[0007] Furthermore, the angle between the main optical axis and the normal of the outgoing light after the light emitted by the backlight source passes through the light pattern adjustment film increases from 0° to 10° from the center of the light pattern adjustment film to the edge of the light pattern adjustment film, and the angular cone range of the outgoing light is 10°-13°.

[0008] Furthermore, the backlight source is a collimated backlight source, and the optical adjustment microstructure is an optical diffusion structure.

[0009] Furthermore, the light pattern adjustment film is a Fresnel lens, the smooth surface of the Fresnel lens faces the backlight source, the center of the Fresnel lens coincides with the center of the backlight source, and the focal length of the Fresnel lens increases from its center to its edge.

[0010] Furthermore, the angle between the main optical axis and the normal of the light emitted by the backlight source after passing through the light pattern adjustment film remains unchanged from the center to the edge of the light pattern adjustment film, and the angular cone range of the light is 20°-25°.

[0011] Furthermore, the backlight source is a collimated backlight source, and the optical adjustment microstructure is an optical diffusion structure.

[0012] Furthermore, the light pattern adjustment film includes a plurality of light-expanding structures arranged in a matrix, wherein the side of each light-expanding structure close to the backlight source is a plane, and the side of each light-expanding structure away from the backlight source is a curved surface, and the curved surface satisfies AX2+BY2=Z, wherein A and B are constants, X, Y, and Z represent variables in a first direction, a second direction perpendicular to the first direction, and a third direction perpendicular to the first direction and the second direction, respectively, and the ratio of A to B ranges from 1 to 4.

[0013] Furthermore, the light pattern adjustment film is a viewing angle control film, and the viewing angle control film includes a PICASUS film.

[0014] Furthermore, the light pattern adjustment film includes a first light expanding structure and a second light expanding structure arranged in the first light expanding structure, the refractive index of the first light expanding structure is greater than the refractive index of the second light expanding structure; the shape of the projection of the second light expanding structure on the backlight source includes one or more of a circle and an ellipse.

[0015] Furthermore, the uniformity of the light emitted by the backlight source after passing through the light pattern adjustment film is greater than 90%.

[0016] Furthermore, the collimated backlight source includes: a reflective sheet; a light guide plate, arranged on the side of the reflective sheet close to the light pattern adjustment film; a light source, arranged on one side of the light guide plate; a turning film, arranged on the side of the light guide plate close to the light pattern adjustment film; and a protective layer, arranged on the side of the turning film close to the light pattern adjustment film.

[0017] Furthermore, the optical adjustment microstructure is an optical focusing structure, the backlight source is a non-collimated backlight source, and the non-collimated backlight source includes: a light source; a reflective sheet, arranged on the side of the light source away from the light type adjustment film; a diffuser, arranged on the side of the light source close to the light type adjustment film; and a light enhancement film, arranged on the side of the diffuser close to the light type adjustment film; the light type adjustment film includes a first focusing structure and a second focusing structure arranged in the first focusing structure, the refractive index of the first focusing structure is less than the refractive index of the second focusing structure; the shape of the projection of the second focusing structure on the backlight source includes one or more of a circle and an ellipse. Beneficial effects

[0018] The present invention adjusts the light pattern of the backlight module through a light pattern adjustment film, so that the angle between the main optical axis of the outgoing light after the light emitted by the backlight source passes through the light pattern adjustment film and the normal is centrally symmetrical, and tends to increase from the center of the light pattern adjustment film to the edge of the light pattern adjustment film; the backlight light pattern is shaped to achieve directional backlight, and different main optical axis angles of the light are designed at different positions of the backlight module, so that more light emitted by the backlight source enters the eye-entry viewing angle range of the optical machine module, achieving higher light efficiency utilization and better viewing angle uniformity, realizing power saving function, enhancing the differentiated performance of the product, and improving the market competitiveness of the product.

[0019] The present invention adjusts the light pattern of the backlight module through a light pattern adjustment film, so that the angle between the main optical axis and the normal of the outgoing light emitted by the backlight source after passing through the light pattern adjustment film remains unchanged from the center of the light pattern adjustment film to the edge of the light pattern adjustment film, thereby expanding the angular cone range of the outgoing light, allowing more light emitted by the backlight source to enter the eye-entry viewing angle range of the optical machine module, achieving higher light efficiency utilization and better viewing angle uniformity, realizing power saving function, enhancing the differentiated performance of the product, and improving the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] FIG1 is a schematic structural diagram of a backlight module of Example 1;

[0022] FIG2 is a light schematic diagram 1 of a display device according to the present invention;

[0023] 3 is a curve diagram showing a change in the angle between the main optical axis and the normal line of the backlight module of Example 1;

[0024] FIG4 is a schematic structural diagram of a backlight module according to Example 2;

[0025] FIG5 is a second light schematic diagram of the display device of the present invention;

[0026] FIG6 is a schematic structural diagram of a backlight module according to Example 3;

[0027] 7 is a schematic diagram of the light expansion structure of the light pattern adjustment film of Example 3;

[0028] FIG8 is a schematic structural diagram of a backlight module according to Example 4;

[0029] FIG9 is a schematic structural diagram of the light pattern adjustment film of Example 4;

[0030] 10 is a schematic plan view of the light pattern adjustment film of Example 4;

[0031] FIG11 is a schematic structural diagram of a backlight module of Example 5;

[0032] FIG12 is a schematic structural diagram of a backlight module according to Example 6;

[0033] 13 is a schematic structural diagram of the light pattern adjustment film of Example 6;

[0034] FIG14 is a schematic plan view of a light pattern adjusting film according to Example 6. FIG. Modes for Carrying Out the Invention

[0035] The following describes in detail preferred embodiments of the present invention in conjunction with the accompanying drawings to fully introduce the technical content of the present invention to those skilled in the art, to illustrate that the present invention can be implemented, to make the technical content disclosed in the present invention clearer, and to make it easier for those skilled in the art to understand how to implement the present invention. However, the present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments described herein. The description of the embodiments below is not intended to limit the scope of the present invention.

[0036] The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only directions in the drawings. The directional terms used in this article are used to explain and illustrate the present invention, and are not used to limit the scope of protection of the present invention.

[0037] In the accompanying drawings, components with the same structure are represented by the same numerical labels, and components with similar structures or functions are represented by similar numerical labels. In addition, for ease of understanding and description, the size and thickness of each component shown in the accompanying drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component.

[0038] Example 1

[0039] As shown in FIG2 , this embodiment provides a display device 1000 . The display device 1000 includes a backlight module 100 , a display module 200 , and an optical engine module 300 .

[0040] The display module 200 is disposed between the backlight module 100 and the optical engine module 300. In this embodiment, the display module 200 includes a lower polarizer, an array substrate, a liquid crystal layer, a color filter substrate, an upper polarizer and other film structures.

[0041] The optical engine module 300 is formed by combining a plurality of lenses, and the area of ​​the optical engine module 300 is larger than that of the backlight module 100 .

[0042] As shown in FIG. 1 , the backlight module 100 includes a backlight source 1 and a light pattern adjustment film 2 .

[0043] The backlight source 1 has a light-emitting side 101. Specifically, the light-emitting side 101 of the backlight source 1 is the side of the protective layer 15 away from the reflective sheet 11. In this embodiment, the backlight source 1 is a collimated backlight source. The collimated backlight source includes: a reflective sheet 11, a light source 12, a light guide plate 13, a deflection film 14, and a protective layer 15. This embodiment uses an edge-lit light source; in other embodiments, a direct-lit light source may also be used.

[0044] The reflective sheet 11 is used to reflect the light exposed from the bottom of the light guide plate 13 back into the light guide plate 13 , so as to improve the utilization rate of the light.

[0045] The light guide plate 13 is disposed on a side of the reflective sheet 11 close to the light pattern adjustment film 2 . The light guide plate 13 is mainly used to guide the light emitted by the light source 12 toward the light pattern adjustment film 2 .

[0046] The light source 12 is disposed at at least one end of the light guide plate 13 .

[0047] The turning film 14 is disposed on a side of the light guide plate 13 close to the light pattern adjustment film 2 . Light emitted by the light source 12 is guided out through the light guide plate 13 and forms collimated light perpendicular to the protective layer 15 after passing through the turning film 14 .

[0048] The protection layer 15 is disposed on a side of the turning film 14 close to the light pattern adjustment film 2 .

[0049] The light pattern adjustment film 2 is disposed on the light-emitting side 101 of the backlight source 1. The light pattern adjustment film 2 includes an optical adjustment microstructure. In this embodiment, the optical adjustment microstructure is an optical diffusion structure.

[0050] In this embodiment, the light pattern adjustment film 2 is a Fresnel lens. The smooth surface of the Fresnel lens faces the backlight 1, and the center of the Fresnel lens coincides with the center of the backlight 1. The focal length of the Fresnel lens increases from the center to the edge. The diameter of the Fresnel lens is 40 mm, the tooth height of the Fresnel lens is 20 μm, the maximum tooth width of the Fresnel lens is 40 μm, the material of the Fresnel lens is PMMA, and the base thickness of the Fresnel lens is 0.1 mm.

[0051] Among them, the angle A between the main optical axis of the outgoing light after the light emitted by the backlight source 1 passes through the light type adjustment film 2 and the normal is centrally symmetrical, and tends to increase from the center of the light type adjustment film to the edge of the light type adjustment film, or the angle A between the main optical axis of the outgoing light after the light emitted by the backlight source 1 passes through the light type adjustment film 2 and the normal remains unchanged from the center of the light type adjustment film to the edge of the light type adjustment film.

[0052] As shown in FIG2 , the angle A between the main optical axis and the normal of the light emitted by the backlight source 1 in this embodiment after passing through the light pattern adjustment film 2 is centrally symmetrical, and tends to increase from the center to the edge of the light pattern adjustment film.

[0053] As shown in Figure 3, the horizontal axis represents the distance X between a certain position and the center of the light pattern adjustment film, and the vertical axis represents the angle A between the principal optical axis and the normal of the light emitted after passing through the light pattern adjustment film 2. Specifically, the angle A between the principal optical axis and the normal of the light emitted from the backlight source 1 after passing through the light pattern adjustment film 2 increases from 0° to 10° from the center of the light pattern adjustment film to the edge of the light pattern adjustment film.

[0054] As shown in Figure 2, the angle cone B of the outgoing light is in the range of 10° to 13°. In this embodiment, the angle cone B of the outgoing light is 13°.

[0055] The uniformity of the light emitted by the backlight source 1 after passing through the light pattern adjustment film 2 is greater than 90%.

[0056] Through experiments, it can be known that the brightness uniformity within the eye-entering viewing angle range at the center position of the optical module of this embodiment is not much different from the brightness uniformity within the eye-entering viewing angle range at the center position of the optical module when no light type adjustment film is set; this embodiment uses the light type adjustment film 2 to make the angle between the main optical axis of the outgoing light emitted by the backlight source 1 and the normal after passing through the light type adjustment film 2 be centrally symmetrical, and tend to increase from the center of the light type adjustment film to the edge of the light type adjustment film, thereby shaping the backlight light type to achieve directional backlight, and designing different main optical axis angles of light emission at different positions of the backlight module 100 , allowing more light emitted by the backlight source 1 to enter the eye-entry viewing angle range of the optical machine module, achieving higher light efficiency utilization and better viewing angle uniformity, realizing power saving function, enhancing product differentiation performance, and improving product market competitiveness; through the above adjustment, the brightness uniformity within the eye-entry viewing angle range at the edge position of the optical machine module of this embodiment is improved by 2-3 times compared with the brightness uniformity within the eye-entry viewing angle range at the edge position of the optical machine module when no light type adjustment film is set, and compared with the existing display device, the overall brightness of the display device of this embodiment is improved by 1.3-3 times.

[0057] Example 2

[0058] As shown in FIG4 , this embodiment includes most of the technical features of the embodiment 1. The difference between this embodiment and the embodiment 1 is that, in this embodiment, the backlight source 1 is a non-collimated backlight source.

[0059] As shown in Figure 4, in this embodiment, the backlight source 1 includes a reflector 11, a light source 12, a light guide plate 13, a diffuser 16, and a light enhancement film 17. This embodiment uses an edge-lit light source, but in other embodiments, a direct-lit light source may also be used.

[0060] As shown in Figure 4, the reflective sheet 11 is disposed on the side of the light source 12 away from the light pattern adjustment film 2. The reflective sheet 11 is used to reflect the light exposed from the bottom of the light guide plate 13 back into the light guide plate 13 to improve the utilization rate of light.

[0061] The diffuser 16 is disposed on the side of the light source 12 close to the light pattern adjustment film 2. The diffuser 16 atomizes the light source through refraction and reflection of the diffusion material and focuses the light from a small angle to the front to improve the front brightness.

[0062] The brightness enhancement film 17 is disposed on a side of the diffusion sheet 16 close to the light pattern adjustment film 2. The brightness enhancement film 17 mainly plays a role in enhancing light.

[0063] Experiments have shown that the brightness uniformity within the eye viewing angle range at the center position of the optical machine module of this embodiment is not much different from the brightness uniformity within the eye viewing angle range at the center position of the optical machine module when no light type adjustment film is set. However, the brightness uniformity within the eye viewing angle range at the edge position of the optical machine module of this embodiment is improved by 2-3 times compared with the brightness uniformity within the eye viewing angle range at the edge position of the optical machine module when no light type adjustment film is set. Moreover, compared with the existing display device, the overall brightness of the display device of this embodiment is improved by 1.3-3 times.

[0064] Example 3

[0065] As shown in Figure 5 , this embodiment includes most of the technical features of Example 1. The difference between this embodiment and Example 1 lies in that, in this embodiment, the angle A between the principal optical axis and the normal of the light emitted by the backlight source 1 after passing through the light pattern adjustment film 2 remains constant from the center to the edge of the light pattern adjustment film, and the angle cone B of the light emitted ranges from 20° to 25°. In this embodiment, the angle cone B of the light emitted is 25°, and the uniformity of the light emitted by the backlight source 1 after passing through the light pattern adjustment film 2 is greater than 90%.

[0066] As shown in Figures 6 and 7, the light pattern adjustment film 2 in this embodiment includes a plurality of light-diffusing structures 21 arranged in a matrix. The side of each light-diffusing structure 21 close to the backlight source 1 is a plane, and the side of each light-diffusing structure 21 away from the backlight source 1 is a curved surface. The curved surface satisfies AX2+BY2=Z, where A and B are constants, and X, Y, and Z represent variables in the first direction M, the second direction N perpendicular to the first direction M, and the third direction Q perpendicular to the first direction M and the second direction N, respectively. The ratio of A to B ranges from 1 to 4. If the ratio of A to B is less than 1 or greater than 4, the light within the eye-viewing angle range of the optical engine module will be reduced, resulting in a decrease in the light utilization rate of the backlight module. In this embodiment, the ratio of A to B ranges from 2.

[0067] This embodiment adjusts the light pattern of the backlight module 100 through the light pattern adjustment film 2, so that the angle between the main optical axis and the normal of the outgoing light emitted by the backlight source 1 after passing through the light pattern adjustment film 2 remains unchanged from the center of the light pattern adjustment film to the edge of the light pattern adjustment film, thereby expanding the angular cone range of the outgoing light, allowing more light emitted by the backlight source 1 to enter the eye-entry viewing angle range of the optical machine module, achieving higher light efficiency utilization and better viewing angle uniformity, realizing power saving function, enhancing the differentiated performance of the product, and improving the market competitiveness of the product.

[0068] Example 4

[0069] As shown in Figures 8, 9 and 10, this embodiment includes most of the technical features of Example 3. The difference between this embodiment and Example 3 is that, in this embodiment, the light pattern adjustment film 2 includes a first light expanding structure 22 and a second light expanding structure 23 arranged in the first light expanding structure 22, and the refractive index of the first light expanding structure 22 is greater than the refractive index of the second light expanding structure 23.

[0070] The refractive index of the first light expansion structure 22 is in the range of 1.5-1.8. In this embodiment, the refractive index of the first light expansion structure 22 is 1.78. The refractive index of the second light expansion structure 23 is in the range of 1.1-1.5. In this embodiment, the refractive index of the second light expansion structure 23 is 1.2.

[0071] In this embodiment, a material with a refractive index of 1.78 is used to form a film layer, which serves as the first light-expanding structure 22. A material with a refractive index of 1.2 is then embedded within the first light-expanding structure 22, forming the second light-expanding structure 23. In this embodiment, the second light-expanding structure 23 is cylindrical, and its projection on the reflector 11 is circular. The diameter of the second light-expanding structure 23 ranges from 5 nm to 10 nm, and the pitch of the second light-expanding structure 23 ranges from 10 nm to 200 nm. In this embodiment, the diameter of the second light-expanding structure 23 is 7 nm, and the pitch of the second light-expanding structure 23 is 100 nm.

[0072] In other embodiments, the shape of the second light expansion structure 23 may be an elliptical cylinder, and the shape of the projection of the second light expansion structure 23 on the reflective sheet 11 may also be an ellipse.

[0073] Example 5

[0074] As shown in FIG11 , this embodiment includes most of the technical features of Example 3. The difference between this embodiment and Example 3 is that in this embodiment, the light pattern adjustment film 2 is a viewing angle control film, and the viewing angle control film includes a PICASUS film.

[0075] Specifically, the PICASUS film includes a first control film 24 and a second control film 25 that are alternately stacked and have different refractive indices. The first control film 24 and the second control film 25 are manufactured using a multi-layer co-extrusion process. The first control film 24 and the second control film 25 can both be made of resin.

[0076] Example 6

[0077] As shown in Figures 12, 13 and 14, this embodiment includes most of the technical features of Example 2. The difference between this embodiment and Example 2 is that, in this embodiment, the optical adjustment microstructure is an optical focusing structure, and the light pattern adjustment film 2 includes a first focusing structure 26 and a second focusing structure 27 arranged in the first focusing structure 26, and the refractive index of the first focusing structure 26 is less than the refractive index of the second focusing structure 27.

[0078] The refractive index of the first light-concentrating structure 26 is in the range of 1.1-1.5, and in this embodiment, the refractive index of the first light-concentrating structure 26 is 1.2. The refractive index of the second light-concentrating structure 27 is in the range of 1.5-1.8, and in this embodiment, the refractive index of the second light-concentrating structure 27 is 1.78.

[0079] In this embodiment, a material with a refractive index of 1.2 is used to form a film layer, which serves as the first light-concentrating structure 26. A material with a refractive index of 1.78 is then embedded within the first light-concentrating structure 26, forming the second light-concentrating structure 27. In this embodiment, the second light-concentrating structure 27 is cylindrical in shape, and its projection on the reflector 11 is circular. The diameter of the second light-concentrating structure 27 ranges from 5 nm to 10 nm, and the pitch between the second light-concentrating structures 27 ranges from 10 nm to 200 nm. In this embodiment, the diameter of the second light-concentrating structure 27 is 7 nm, and the pitch between the second light-concentrating structures 27 is 100 nm.

[0080] In other embodiments, the shape of the second light-concentrating structure 27 may be an elliptical cylinder, and the shape of the projection of the second light-concentrating structure 27 on the reflective sheet 11 may also be an ellipse.

[0081] Furthermore, the above is a detailed introduction to a display device provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A display device, comprising: A backlight module, comprising a backlight source and a light pattern adjustment film arranged on the light emitting side of the backlight source; An optical-mechanical module is arranged on a side of the light pattern adjustment film away from the backlight source, and the area of ​​the optical-mechanical module is larger than the area of ​​the backlight module; Wherein, the light pattern adjustment film comprises an optical adjustment microstructure, and the angle between the main optical axis and the normal line of the light emitted by the backlight source after passing through the light pattern adjustment film is centrally symmetrical; After the light emitted by the backlight source passes through the light pattern adjustment film, the outgoing light tends to increase from the center of the light pattern adjustment film to the edge of the light pattern adjustment film; or The angle between the main optical axis and the normal line of the light emitted by the backlight source after passing through the light pattern adjustment film remains unchanged from the center of the light pattern adjustment film to the edge of the light pattern adjustment film.

2. The display device according to claim 1, wherein the angle between the main optical axis and the normal line of the light emitted by the backlight source after passing through the light pattern adjustment film increases from 0° to 10° from the center of the light pattern adjustment film to the edge of the light pattern adjustment film. 3 . The display device according to claim 2 , wherein the angular cone range of the outgoing light is 10°-13°. 4 . The display device according to claim 3 , wherein the backlight source is a collimated backlight source, and the optical adjustment microstructure is an optical diffusion structure. 5 . The display device according to claim 4 , wherein the light pattern adjustment film is a Fresnel lens, a smooth surface of the Fresnel lens faces the backlight source, and a center of the Fresnel lens coincides with a center of the backlight source. 6 . The display device according to claim 5 , wherein the focal length of the Fresnel lens increases from the center to the edge thereof.

7. The display device according to claim 1, wherein the angle between the main optical axis and the normal of the outgoing light after the light emitted by the backlight source passes through the light pattern adjustment film remains unchanged from the center of the light pattern adjustment film to the edge of the light pattern adjustment film, and the angular cone range of the outgoing light is 20°-25°. 8 . The display device according to claim 7 , wherein the backlight source is a collimated backlight source, and the optical adjustment microstructure is an optical diffusion structure.

9. The display device according to claim 8, wherein the light pattern adjustment film comprises a plurality of light expansion structures arranged in a matrix, wherein a side of each light expansion structure close to the backlight source is a plane, and a side of each light expansion structure away from the backlight source is a curved surface, and the curved surface satisfies AX2+BY2=Z, wherein: A and B are constants, and X, Y, and Z represent variables in a first direction, a second direction perpendicular to the first direction, and a third direction perpendicular to the first direction and the second direction, respectively.

10. The display device according to claim 9, wherein the ratio of A to B is in the range of 1-4. 11 . The display device according to claim 8 , wherein the light pattern adjustment film is a viewing angle control film, and the viewing angle control film comprises a PICASUS film. 12 . The display device according to claim 8 , wherein the light pattern adjustment film comprises a first light expansion structure and a second light expansion structure disposed in the first light expansion structure, and a refractive index of the first light expansion structure is greater than a refractive index of the second light expansion structure. 13 . The display device according to claim 12 , wherein a shape of a projection of the second light expansion structure on the backlight source comprises one or more of a circle and an ellipse. 14 . The display device according to claim 3 , wherein the uniformity of the light emitted by the backlight source after passing through the light pattern adjustment film is greater than 90%. 15 . The display device according to claim 7 , wherein the uniformity of the light emitted by the backlight source after passing through the light pattern adjustment film is greater than 90%.

16. The display device according to claim 4, wherein the collimated backlight source comprises: Reflective sheet; A light guide plate, arranged on a side of the reflective sheet close to the light pattern adjustment film; A light source is arranged on one side of the light guide plate; A turning film, disposed on a side of the light guide plate close to the light pattern adjustment film; and The protective layer is arranged on a side of the turning film close to the light pattern adjustment film.

17. The display device according to claim 8, wherein the collimated backlight source comprises: Reflective sheet; A light guide plate, arranged on a side of the reflective sheet close to the light pattern adjustment film; A light source is arranged on one side of the light guide plate; A turning film, disposed on a side of the light guide plate close to the light pattern adjustment film; and The protective layer is arranged on a side of the turning film close to the light pattern adjustment film.

18. The display device according to claim 7, wherein the optical adjustment microstructure is an optical focusing structure, and the backlight source is a non-collimated backlight source.

19. The display device according to claim 18, wherein the non-collimated backlight source comprises: light source; A reflective sheet, arranged on a side of the light source away from the light pattern adjustment film; a diffusion sheet, disposed on a side of the light source close to the light pattern adjustment film; and A brightness enhancement film, disposed on a side of the diffusion sheet close to the light pattern adjustment film; The light pattern adjustment film includes a first light-condensing structure and a second light-condensing structure disposed in the first light-condensing structure, and the refractive index of the first light-condensing structure is smaller than the refractive index of the second light-condensing structure. 20 . The display device according to claim 19 , wherein a shape of a projection of the second light-focusing structure on the backlight source comprises one or more of a circle and an ellipse.

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