Optical film assembly, backlight module and display device

Abstract

The embodiment of the invention discloses an optical film assembly, a backlight module and a display device. The optical film assembly, the backlight module and the display device are used for reducing the thickness of the optical film assembly. The embodiment of the invention provides an optical film assembly. The optical film assembly comprises a prism film, a brightness enhancement film located on one side of the prism film, and a first bonding layer located between the prism film and the brightness enhancement film.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an optical film assembly, a backlight module and a display device. Background Art

[0002] Displays have been widely used in various fields and are inseparable from our work, study and life. In the prior art, the backlight module of the display usually needs to be provided with a prism sheet and a brightness enhancement film to improve the light utilization rate, but the prism sheet and the brightness enhancement film are provided independently, which will result in a thicker product. Summary of the invention

[0003] The embodiments of the present application provide an optical film assembly, a backlight module and a display device, which are used to reduce the thickness of the optical film assembly.

[0004] An embodiment of the present application provides an optical film assembly, which includes: a prism film, a brightness enhancement film located on one side of the prism film, and a first adhesive layer located between the prism film and the brightness enhancement film.

[0005] In some embodiments, the prism film includes a substrate, a first prism layer on one side of the substrate, a first prism layer, a second prism layer between the first prism layer and the brightness enhancement film, and a second adhesive layer between the first prism layer and the second prism layer.

[0006] In some embodiments, the first prism layer includes a plurality of first prisms arranged along a first direction and extending along a second direction; the second prism layer includes a plurality of second prisms arranged along a third direction and extending along a fourth direction; the first direction is perpendicular to the third direction; and the second direction intersects with the fourth direction.

[0007] In some embodiments, the light transmission axis of the brightness enhancement film extends in a direction parallel to the fourth direction;

[0008] The non-obtuse angle between the fourth direction and the first direction is greater than or equal to 0° and less than or equal to 15°.

[0009] In some embodiments, the non-obtuse angle between the second direction and the first direction is greater than or equal to 60° and less than or equal to 75°.

[0010] In some embodiments, at least one of the substrate, the first bonding layer, and the second bonding layer includes a plurality of scattering particles.

[0011] In some embodiments, the haze of the first bonding layer is greater than or equal to and less than or equal to;

[0012] The haze of the substrate is greater than or equal to 65% and less than or equal to 70%;

[0013] The second adhesive layer has a haze greater than or equal to 3% and less than or equal to 10%.

[0014] In some embodiments, the diameter of the scattering particles is greater than or equal to 2 microns and less than or equal to 3 microns.

[0015] A backlight module provided in an embodiment of the present application includes: a light source, and an optical film assembly provided in an embodiment of the present application located on one side of the light source.

[0016] A display device provided in an embodiment of the present application includes: a backlight module provided in an embodiment of the present application, and a display panel located on a light emitting side of the backlight module.

[0017] In the optical film assembly, display panel, and display device provided in the embodiments of the present application, the prism film and the brightness enhancement film are bonded by a first bonding layer, that is, the prism film and the brightness enhancement film are integrated into one structure, which can reduce the total thickness of the optical film assembly compared to the prior art where the prism film and the brightness enhancement film are independently provided. The optical film assembly is applied to the backlight module of the display product, which can reduce the thickness of the backlight module, thereby reducing the thickness of the display product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of an optical film assembly provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of another optical film assembly provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of another optical film assembly provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of another optical film assembly provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of a first prism provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of the structure of a second prism provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of another first prism provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of the structure of another second prism provided in an embodiment of the present application;

[0027] Fig. 9 A schematic diagram of the structure of a backlight film assembly provided in an embodiment of the present application;

[0028] Fig.10 A schematic diagram of the structure of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. And in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of this application.

[0030] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and other similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0031] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, but are only intended to illustrate the content of the present application. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0032] The present application embodiment provides an optical film assembly, such as Figure 1 , Figure 2 As shown, the optical film assembly includes: a prism film 1 , a brightness enhancement film 2 located on one side of the prism film 1 , and a first adhesive layer 3 located between the prism film 1 and the brightness enhancement film 2 .

[0033] In the optical film assembly provided by the embodiment of the present application, the prism film and the brightness enhancement film are bonded by a first bonding layer, that is, the prism film and the brightness enhancement film are integrated into one structure, which can reduce the total thickness of the optical film assembly compared to the prior art where the prism film and the brightness enhancement film are independently provided. The optical film assembly is applied to the backlight module of the display product, which can reduce the thickness of the backlight module, thereby reducing the thickness of the display product.

[0034] In some embodiments, Figure 1 As shown, the brightness enhancement film 2 includes at least two stacked birefringent index layers 201; the birefringent index layers have the same refractive index in one direction and different refractive indexes in another direction. Thus, the transmission of polarized light along the specific direction (such as S polarized light) and the reflection of polarized light perpendicular to the specific direction (such as P polarized light) can be achieved; it should be noted that Figure 1 The medium brightness enhancement film includes first double refractive index layers 201-1 and second double refractive index layers 201-2 with different refractive indices which are alternately arranged.

[0035] In specific implementation, the type and quantity of the double refractive index layers included in the brightness enhancement film can be set according to actual needs.

[0036] In some embodiments, Figure 1 , Figure 2 As shown, the prism film 1 includes: a substrate 101, a first prism layer 102 located on one side of the substrate 101, the first prism layer 102, a second prism layer 103 located between the first prism layer 102 and the brightness enhancement film 2, and a second adhesive layer 104 located between the first prism layer 102 and the second prism layer 103.

[0037] It should be noted that in the related art, the backlight module of the display product needs to be provided with two layers of prism sheets, and each layer of prism sheets needs to be provided with a prism structure on a substrate and supported by the substrate, that is, the prism sheet includes a substrate and a prism structure located on one side of the substrate. The double-layer substrate and double-layer prism structure included in the two-layer prism sheet will result in a thick backlight module.

[0038] In the optical film assembly provided by the embodiment of the present application, the two prism layers are bonded by the second bonding layer, that is, the two prism layers are integrated into one structure, and there is no need to set up an additional substrate to support the second prism layer located on the upper layer. The thickness of the second bonding layer is much smaller than the thickness of the substrate, that is, compared with the case where the two prism layers are independently set in the prior art, the total thickness of the optical film assembly can be reduced. The optical film assembly is applied to the backlight module of the display product, which can reduce the thickness of the backlight module, thereby reducing the thickness of the display product.

[0039] In some embodiments, the thickness of the substrate is greater than or equal to 50 micrometers and less than or equal to 400 micrometers, and the maximum thickness of the first bonding layer and the second bonding layer is greater than or equal to 5 micrometers and less than or equal to 100 micrometers.

[0040] In some embodiments, Figure 3 As shown, the first prism layer 102 includes a plurality of first prisms 1021 arranged along a first direction X and extending along a second direction X'; the second prism layer 103 includes a plurality of second prisms 1031 arranged along a third direction Y and extending along a fourth direction X"; the first direction X is perpendicular to the third direction Y; the second direction X' intersects with the fourth direction X".

[0041] It should be noted that when the optical film assembly is applied to the backlight module of a display product, the display product has a fixed horizontal direction, which is parallel to the direction in which the human eyes are arranged. Figure 3 The first direction X corresponds to the horizontal direction of the display product when the optical film assembly is applied to the display product. Figure 3 In the embodiment, the third direction Y is perpendicular to the fourth direction X″.

[0042] It should be noted that Figure 1 For along Figure 3 The cross-sectional view of AA', Figure 2 For along Figure 3 Cross-sectional view of BB'.

[0043] In a specific implementation, a plurality of first prisms in the first prism layer are closely arranged, that is, adjacent first prisms are in contact with each other; a plurality of second prisms in the second prism layer are closely arranged, that is, adjacent second prisms are in contact with each other.

[0044] It should be noted that Figure 1 Take the first prism 102 and the second prism 103 as an example, both of which are triangular prisms, that is, the shape of the first prism in a cross section perpendicular to the substrate and perpendicular to the second direction is a triangle, and the shape of the second prism in a cross section perpendicular to the substrate and perpendicular to the fourth direction is a triangle. Figure 3 The different dashed lines in the figure represent the edge 10211 of the first prism 102 away from the substrate 101 and the edge 10311 of the second prism 103 away from the substrate 101 .

[0045] In some embodiments, the light transmission axis of the brightness enhancement film 2 extends in a direction parallel to the fourth direction X″.

[0046] It should be noted that no matter what polarization state the light emitted from the prism film is in, the light will become partially polarized light with a main polarization direction of 0° after passing through the brightness enhancement film. Therefore, when the main polarization direction of the incident light is parallel to the extension direction of the light transmission axis of the brightness enhancement film, more light will pass through the brightness enhancement film. That is, in the optical module assembly provided in the embodiment of the present application, the extension direction of the light transmission axis of the brightness enhancement film is parallel to the fourth direction X", which can improve the light transmittance of the optical module assembly.

[0047] It should be noted that one of the certification standards for display products is TCO. TCO needs to meet the following requirements for the uniformity of viewing angle brightness of display products: (1) TCO in the horizontal direction of the display product: [(L max+30° / L min+30° )+(L max-30° / L min-30° )] / 2≤1.73; where L max+30° L is the brightness value corresponding to the viewing angle of +30° with the maximum brightness in the horizontal direction. min+30° L is the brightness value corresponding to the viewing angle of +30° with the minimum brightness in the horizontal direction. max-30° L is the brightness value corresponding to the viewing angle of -30° with the maximum brightness in the horizontal direction. min-30° The brightness value corresponding to the viewing angle of -30°, which is the minimum brightness in the horizontal direction. (2) TCO of the display product in the vertical direction: L max+15° / L min+15° ≤1.73, L max-15° / L min-15° ≤1.73; where L max+15° L is the brightness value corresponding to the viewing angle of maximum brightness in the vertical direction + 15°. min+15° L is the brightness value corresponding to the viewing angle of minimum brightness in the vertical direction +15°. max-15° L is the brightness value corresponding to the viewing angle of -15° with the maximum brightness in the vertical direction. min-15°It is the brightness value corresponding to the viewing angle of -15°, the viewing angle with the minimum brightness in the vertical direction. The related technology includes a double-layer prism sheet and a backlight module with a brightness enhancement film applied to display products, which cannot meet the viewing angle requirements of TCO for the brightness uniformity of display products. Specifically, in the related technology, in the double-layer prism sheet, the lower prism sheet corresponds to the first prism layer of the present application, and the extension direction of the prism structure included in the lower prism sheet is perpendicular to the first direction involved in the embodiment of the present application, and the upper prism sheet corresponds to the second prism layer of the present application, and the extension direction of the prism structure included in the upper prism sheet is parallel to the first direction involved in the embodiment of the present application. When the optical film assembly is applied to the backlight module, the brightness distribution of the light emitted by the backlight module is related to the extension direction of the prism. In the related art, when the extension direction of the prism structure included in the upper prism sheet is parallel to the first direction involved in the embodiment of the present application, and the extension direction of the prism structure included in the lower prism sheet is perpendicular to the first direction involved in the embodiment of the present application, the setting method of the double-layer prism in the related art makes the light converge more in the 0° direction perpendicular to the screen, but sacrifices the viewing angle. The backlight module including the double-layer prism sheet is applied to the display product and cannot meet the viewing angle requirements of TCO for the uniformity of brightness of the display product. The optical film assembly provided in the embodiment of the present application designs the extension direction of each layer of the prism structure so that the backlight module applied to the display product can meet the viewing angle requirements of TCO for the uniformity of brightness of the display product.

[0048] In some embodiments, a non-obtuse angle a2 between the fourth direction X″ and the first direction X is greater than or equal to 0° and less than or equal to 15°.

[0049] In some embodiments, the non-obtuse angle a1 between the second direction X′ and the first direction X is greater than or equal to 60° and less than or equal to 75°.

[0050] In specific implementation, since the extension direction of the second prism structure, i.e., the fourth direction X”, needs to be parallel to the extension direction of the light transmission axis of the brightness enhancement film, taking into account the actual phase deviation, the non-obtuse angle between the extension direction of the second prism structure, i.e., the fourth direction X” and the first direction X is greater than or equal to 0° and less than or equal to 15°. Simulation of the optical film assembly provided in the embodiment of the present application shows that when a2 is greater than or equal to 0° and less than or equal to 15° and a1 is equal to 90°, the brightness gain of the optical film assembly is the largest but the viewing angle brightness uniformity is the worst. When a2 is equal to 5° and a1 is equal to 40°, the viewing angle brightness uniformity of the optical film assembly is the best but the brightness is low. In the optical film assembly provided in the embodiment of the present application, a1 is greater than or equal to 60° and less than or equal to 75°, which can achieve the goal of meeting the brightness requirements while meeting the TCO viewing angle brightness uniformity requirements.

[0051] In a specific implementation, the direction in which the first direction X extends to the right is defined as the positive direction of the first direction X, and the direction in which the first direction X extends to the left is defined as the negative direction of the first direction X. The non-obtuse angle between the fourth direction X" and the first direction X can be the non-obtuse angle between the fourth direction X" and the positive direction of the first direction X, or the non-obtuse angle between the fourth direction X" and the negative direction of the first direction X.

[0052] Furthermore, the non-obtuse angle a2 between the fourth direction X" and the first direction X is greater than or equal to 3° and less than or equal to 10°. Thus, the backlight module can meet the brightness and TCO viewing angle requirements when applied to display products.

[0053] Furthermore, the angle a1 between the second direction X' and the first direction X is greater than or equal to 65° and less than or equal to 70°. This can avoid serious brightness loss when the optical film assembly is applied to the backlight module when a1 is less than 65°. It can also avoid the backlight module being unable to meet the TCO viewing angle requirements when applied to display products when a1 is greater than 70°.

[0054] In some embodiments, Figure 4 As shown, at least one of the substrate 101 , the first bonding layer 3 , and the second bonding layer 104 includes a plurality of scattering particles 4 .

[0055] That is, only the substrate may include multiple scattering particles, only the first adhesive layer may include multiple scattering particles, only the second adhesive layer may include multiple scattering particles, or the substrate, the first adhesive layer and the second adhesive layer may all include multiple scattering particles. Figure 4 In the figure, the substrate 101, the first bonding layer 3 and the second bonding layer 104 all include multiple scattering particles 4. The multiple scattering particles 5 included in the substrate 1 are multiple first scattering particles 401, the multiple scattering particles 4 included in the second bonding layer 104 are multiple second scattering particles 402, and the multiple scattering particles 4 included in the first bonding layer 3 are multiple third scattering particles 403.

[0056] The optical film assembly provided in the embodiment of the present application comprises a plurality of scattering particles in at least one of the substrate, the first bonding layer and the second bonding layer, which can improve the haze of the optical film assembly, so that the light is broken up and evenly dispersed after reaching the film layer where the scattering particles are located, which is more conducive to improving the uniformity of the brightness of the light output.

[0057] In some embodiments, the volume of the scattering particles in the film layer is greater than or equal to 5% and less than or equal to 45%.

[0058] It should be noted that the volume of the scattering particles in the film layer in which they are located affects the haze of the film layer in which they are located. Haze refers to the percentage of the transmitted light intensity that deviates from the incident light by more than 2.5° to the total transmitted light intensity. The greater the haze, the lower the gloss and transparency of the film layer. The larger the volume of the scattering particles in the film layer in which they are located, the higher the haze of the film layer in which they are located.

[0059] In some embodiments, the substrate has a haze greater than or equal to 15% and less than or equal to 45%.

[0060] Furthermore, the haze of the substrate is greater than or equal to 25% and less than or equal to 45%.

[0061] It should be noted that if the haze of the substrate is less than 25%, the viewing angle brightness cannot meet the TCO requirements. If the haze of the substrate is greater than 45%, the scattering particle content is high and the brightness loss of the light output is obvious. That is, the optical module assembly provided in the embodiment of the present application has a haze of the substrate greater than or equal to 25% and less than or equal to 45%, so that the optical module assembly can meet the TCO requirements without excessive brightness loss.

[0062] In some embodiments, the second bonding layer has a haze greater than or equal to 15% and less than or equal to 45%.

[0063] Furthermore, the haze of the second adhesive layer is greater than or equal to 15% and less than or equal to 30%.

[0064] It should be noted that if the haze of the second bonding layer is less than 15%, the content of scattering particles is relatively small, and the shielding property of the scattering particles to light is relatively poor, which affects the uniformity of light dispersion. If the haze of the second bonding layer is greater than 30%, the content of scattering particles is high, and the loss of light brightness is obvious. That is, in the optical module assembly provided in the embodiment of the present application, the haze of the second bonding layer is greater than or equal to 15% and less than or equal to 30%, thereby improving the uniformity of light brightness while avoiding excessive brightness loss, so that the optical module assembly meets the requirements of TCO.

[0065] In a specific implementation, for example, the haze of the second adhesive layer is 15% and the haze of the substrate is 40%. Of course, in a specific implementation, the haze of the substrate can be appropriately reduced to obtain more brightness gain while meeting the TCO viewing angle requirement.

[0066] In some embodiments, the scattering particles are spherical in shape, and the diameter of the scattering particles is greater than or equal to 2 micrometers and less than or equal to 3 micrometers.

[0067] In some embodiments, the refractive index of the substrate, the refractive index of the first prism layer, the refractive index of the second prism layer, the first bonding layer, and the second bonding layer is greater than or equal to 1.45 and less than or equal to 1.7.

[0068] It should be noted that the higher the refractive index of each film layer of the optical module assembly, the higher the brightness of the output light of the optical module assembly, but in actual use, the film material with a higher refractive index will cause related reliability problems such as poor scratch resistance. In the optical film assembly provided in the embodiment of the present application, the refractive index of the substrate, the refractive index of the first prism layer, the refractive index of the second prism layer, the refractive index of the first bonding layer and the refractive index of the second bonding layer are greater than or equal to 1.45 and less than or equal to 1.7, which is conducive to balancing the brightness and scratch resistance of the film material.

[0069] For example, the performance of the optical module assembly is improved. Further, the refractive index of the substrate, the refractive index of the first prism layer, the refractive index of the second prism layer, the refractive index of the first bonding layer, and the refractive index of the second bonding layer are greater than or equal to 1.52 and less than or equal to 1.61. Thus, the scratch resistance of the optical module assembly can be ensured while improving the brightness of the optical film assembly and meeting the TCO requirements.

[0070] In some embodiments, the period of the first prism is equal to the period of the second prism. The period of the first prism is the maximum width of the first prism in the fifth direction when multiple first prisms are closely arranged, and the period of the second prism is the maximum width of the first prism in the third direction when multiple second prisms are closely arranged. The fifth direction is perpendicular to the second direction, and the third direction is perpendicular to the fourth direction. Taking into account the difficulty of making the first prism and the second prism, in a specific implementation, the period of the first prism is equal to the period of the second prism, for example, greater than or equal to 25 microns and less than or equal to 50 microns; further, the period of the first prism is equal to the period of the second prism, greater than or equal to 30 microns and less than or equal to 45 microns.

[0071] In some embodiments, Figures 5 to 8 As shown, the cross-section shape of the first prism 1021 along the first direction is a first triangle, and the first triangle includes a first vertex 10212 away from the side of the substrate 1; the cross-section shape of the second prism 1031 along the third direction is a second triangle, and the second triangle includes a second vertex 10312 away from the side of the substrate 1;

[0072] like Figure 5 As shown, the first vertex angle 10212 is 90°, or, as Figure 7 As shown, the first vertex 10212 is a rounded corner, and the central angle corresponding to the rounded corner is 90°;

[0073] like Figure 6 As shown, the second vertex angle 10312 is 90°, or, as Figure 8 As shown, the second vertex 10312 is a rounded corner, and the center angle corresponding to the rounded corner is 90°.

[0074] It should be noted that Figure 5 , Figure 7The fifth direction is perpendicular to the second direction. Figure 6 , Figure 8 It is a cross-sectional view along the third direction Y. Figure 6 , Figure 8 Only a partial area of ​​the second adhesive layer 104 is shown.

[0075] That is, the first triangle and the second triangle can be triangles or rounded triangles. When the first triangle is a triangle, the first vertex angle is a right angle, and when the second triangle is a triangle, the second vertex angle is a right angle; when the first triangle is a rounded triangle, the first vertex angle is rounded, and when the second triangle is a triangle, the second vertex angle is rounded.

[0076] It should be noted that, compared with other angles, when the first vertex angle is 90°, the second vertex angle is 90°, or the central angle corresponding to the rounded angle is 90°, the light output brightness of the optical module assembly is the highest.

[0077] The present application provides a backlight module, such as Fig. 9 As shown, it includes: a light source 5, and an optical film assembly 6 provided in an embodiment of the present application located on one side of the light source 5.

[0078] In specific implementation, Fig. 9 As shown, for example, the light source 5 is disposed opposite to a side surface of the substrate 101 .

[0079] A display device provided in an embodiment of the present application is Fig.10 As shown, the display device includes: a backlight module 7 provided in an embodiment of the present application, and a display panel 8 located on the light emitting side of the backlight module 7 .

[0080] In a specific implementation, the display panel 8 is, for example, a liquid crystal display panel, which includes: an array substrate 801 and an opposite substrate 802 that are oppositely arranged, and a liquid crystal layer 803 located between the array substrate 801 and the opposite substrate 802 .

[0081] The display device provided in the embodiment of the present application is any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, etc. Other essential components of the display device should be understood by ordinary technicians in the field, and will not be described in detail here, nor should they be used as limitations on the present application. The implementation of the display device can refer to the above-mentioned embodiment of the display panel, and the repeated parts will not be described in detail.

[0082] In summary, in the optical film assembly, display panel, and display device provided in the embodiments of the present application, the prism film and the brightness enhancement film are bonded by the first bonding layer, that is, the prism film and the brightness enhancement film are integrated into one structure, which can reduce the total thickness of the optical film assembly compared to the prior art where the prism film and the brightness enhancement film are independently provided. The optical film assembly is applied to the backlight module of the display product, which can reduce the thickness of the backlight module, thereby reducing the thickness of the display product.

[0083] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0084] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An optical film assembly, characterized in that: The optical film assembly comprises: a prism film, a brightness enhancement film located on one side of the prism film, and a first bonding layer located between the prism film and the brightness enhancement film.

2. The optical film assembly according to claim 1, characterized in that: The prism film includes: a substrate, a first prism layer located on one side of the substrate, a first prism layer, a second prism layer located between the first prism layer and the brightness enhancement film, and a second adhesive layer located between the first prism layer and the second prism layer.

3. The optical film assembly according to claim 2, characterized in that: The first prism layer includes a plurality of first prisms arranged along a first direction and extending along a second direction; the second prism layer includes a plurality of second prisms arranged along a third direction and extending along a fourth direction; the first direction is perpendicular to the third direction; and the second direction intersects with the fourth direction.

4. The optical film assembly according to claim 3, characterized in that: The light transmission axis of the brightness enhancement film extends in a direction parallel to the fourth direction; The non-obtuse angle between the fourth direction and the first direction is greater than or equal to 0° and less than or equal to 15°.

5. The optical film assembly according to claim 4, characterized in that: A non-obtuse angle between the second direction and the first direction is greater than or equal to 60° and less than or equal to 75°.

6. The optical film assembly according to any one of claims 2 to 5, characterized in that: At least one of the substrate, the first bonding layer, and the second bonding layer includes a plurality of scattering particles.

7. The optical film assembly according to claim 6, characterized in that: The volume of the scattering particles in the film layer is greater than or equal to 5% and less than or equal to 45%; The haze of the substrate is greater than or equal to 15% and less than or equal to 45%; The haze of the second adhesive layer is greater than or equal to 10% and less than or equal to 45%.

8. The optical film assembly according to claim 6, characterized in that: The diameter of the scattering particles is greater than or equal to 2 micrometers and less than or equal to 3 micrometers.

9. A backlight module, characterized in that: include: A light source, and an optical film assembly according to any one of claims 1 to 8, located on one side of the light source.

10. A display device, characterized in that: The display device comprises: the backlight module according to claim 9, and a display panel located on the light emitting side of the backlight module.

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