Backlight module with reasonably configured diffusion film and bright enhancement film

Abstract

The utility model provides a backlight module reasonably provided with a diffusion film and a bright enhancement film, which relates to the technical field of liquid crystal display, and comprises a backlight assembly, the backlight assembly is composed of a mounting cover and a backlight box, and the mounting cover is arranged above the backlight box; the diffusion assembly is composed of an upper layer diffusion film and a lower layer diffusion film which are arranged in the backlight box, spacing columns are arranged below the upper layer diffusion film and the lower layer diffusion film, the spacing columns are annularly distributed, and the diameters of the spacing columns are sequentially increased from inside to outside. When the spacing columns which are annularly distributed and have diameters gradually increased from inside to outside are adopted, the inner-layer small-diameter spacing columns form dense support and small-range diffuse reflection, and the outer-layer large-diameter spacing columns enlarge the light diffusion radius, so that light is in a layered diffusion path of'center dense scattering-edge wide-angle diffusion 'between the two layers of diffusion films.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display technology, and in particular to a backlight module with a reasonable configuration of diffusion film and brightness enhancement film. Background Technology

[0002] In LCD display devices, the backlight module is an important component, and its performance directly affects the display effect of the LCD display device. The diffusion film and brightness enhancement film in the backlight module play a key role. The diffusion film is mainly used to evenly diffuse the light emitted by the light source, reduce light spots and dark corners, and improve the uniformity of the backlight. The brightness enhancement film is used to improve the light emission efficiency of the backlight and enhance the brightness of the displayed image.

[0003] However, there are some problems with the current backlight module configuration of the diffusion film and the brightness enhancement film. On the one hand, the position of the diffusion film and the brightness enhancement film is not reasonable enough, resulting in a large loss of light during transmission, which cannot give full play to the performance advantages of the two. This makes it difficult for the brightness and uniformity of the backlight module to reach the ideal state at the same time. On the other hand, the existing configuration makes the overall thickness of the backlight module relatively thick, which is not conducive to the development of thinner and lighter LCD devices, and also increases the production cost.

[0004] Therefore, this utility model proposes a backlight module with a reasonable configuration of diffusion film and brightness enhancement film. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies and propose a backlight module with a reasonable configuration of diffusion film and brightness enhancement film.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a backlight module with a reasonable configuration of diffusion film and brightness enhancement film, including a backlight assembly, wherein the backlight assembly is composed of a mounting cover and a backlight box, the mounting cover is disposed above the backlight box, and further includes;

[0007] The diffusion assembly consists of an upper diffusion film and a lower diffusion film disposed inside the backlight box. Spacer pillars are disposed below both the upper and lower diffusion films. The spacer pillars are distributed in a ring, and the diameter of the spacer pillars increases sequentially from the inside to the outside.

[0008] Furthermore, a brightness enhancement component is provided between the upper diffusion film and the mounting cover. The brightness enhancement component consists of a brightness enhancement film and a light guide plate, with the light guide plate positioned below the brightness enhancement film.

[0009] The beneficial effects of adopting the above-mentioned further solution are as follows: the light, homogenized by the diffusion component, enters the light guide plate. Through the total internal reflection and refraction of the light guide groove on its bottom surface, the surface light source is converted into uniformly transmitted parallel light. Then, the prism structure of the brightness enhancement film constrains the angle of the light, causing the divergent light to converge in a direction perpendicular to the display surface, forming a highly concentrated emitted light. The light guide plate integrates the diffused scattered light into an ordered beam through light transmission path planning, reducing lateral light energy loss. The prism array of the brightness enhancement film further compresses the light divergence angle, thereby improving the center brightness and achieving synergistic optimization of backlight brightness uniformity and light emission efficiency, meeting the high-definition display's demand for strong light efficiency.

[0010] Furthermore, a light guide groove is provided at the bottom of the light guide plate. The light guide groove is rectangular in shape, and the spacing between two adjacent light guide grooves is equal.

[0011] The beneficial effects of adopting the above-mentioned further scheme are as follows: when light enters the bottom of the light guide plate from the light source mechanism, the rectangularly distributed and equally spaced light guide grooves will regularly refract and reflect the light. Specifically, the inclined surface of the light guide groove causes total internal reflection of the light, guiding the light to the upper surface of the light guide plate; while the diffuse reflection structure at the bottom of the groove scatters some of the light upward. The two effects together transform the line light source or point light source into a uniform surface light source.

[0012] Furthermore, a light source mechanism is provided on the backlight box below the lower diffusion film. There are two light source mechanisms in total, one of which is arranged along the width direction of the backlight box, and the other of which is arranged along the length direction of the backlight box.

[0013] The beneficial effects of adopting the above-mentioned further scheme are: the two sets of orthogonally distributed light source mechanisms project light along the width and length directions of the backlight box respectively, forming a "cross" light source layout. The light emitted by the light source in the width direction is scattered laterally by the lower diffuser film, while the light from the light source in the length direction is simultaneously scattered longitudinally. The two form a bidirectional superimposed diffuse reflection field under the layered diffusion effect of the spacer column, and finally mix into a uniform surface light source through the upper diffuser film.

[0014] Furthermore, the bottom of the mounting cover is provided with a snap-fit ​​component, and the top of the backlight box is provided with a snap-fit ​​bracket. The mounting cover and the backlight box are snapped together by the snap-fit ​​component and the snap-fit ​​bracket.

[0015] The beneficial effects of adopting the above-mentioned further solution are as follows: During installation, the snap-fit ​​component is pushed in along the guide surface of the snap-fit ​​frame, and the slot is locked by the elastic deformation of the structure, forming a mechanical limit; during disassembly, the snap-fit ​​component is disengaged from the slot under the action of external force, and quick separation is completed. This structure uses geometric shape matching to achieve tool-free installation. At the same time, the tight fit of the snap-fit ​​surface can reduce the internal gap of the module and prevent light from leaking from the seam.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0017] In this invention, light from the light source is initially scattered by the lower diffusion film. When it passes through the ring-shaped spacers with diameters increasing from the inside to the outside, the inner small-diameter spacers form dense support and diffuse reflection in a small area, while the outer large-diameter spacers expand the light diffusion radius. This results in a layered diffusion path of "dense scattering at the center and wide-angle diffusion at the edges" between the two diffusion films. Finally, the light is uniformly output again through the upper diffusion film. The ring-shaped variable-diameter spacer design is adapted to the surface light source characteristics of the backlight box. The dense spacers in the central area improve the light diffusion accuracy, while the large-diameter spacers in the edge area compensate for light intensity attenuation, thus improving backlight uniformity. The layered diffusion structure reduces the use of a single thick film, reducing the thickness. At the same time, the variable-diameter structure achieves a dual improvement in brightness uniformity and thinness with the same number of film layers through optical path optimization. Attached Figure Description

[0018] Figure 1 The front view of the backlight module with a reasonable configuration of diffusion film and brightness enhancement film according to this utility model;

[0019] Figure 2 An exploded view of the backlight module with a reasonable configuration of diffusion film and brightness enhancement film according to this utility model;

[0020] Figure 3 A split view of the backlight assembly in the backlight module with a reasonable configuration of diffusion film and brightness enhancement film according to this utility model;

[0021] Figure 4 This is an exploded view of the diffusion component in the backlight module with a reasonable configuration of diffusion film and brightness enhancement film according to this utility model.

[0022] Figure 5 This is an exploded view of the brightness enhancement component in the backlight module of the present invention, which rationally configures the diffusion film and the brightness enhancement film.

[0023] Figure Labels

[0024] 1. Backlight assembly; 11. Mounting cover; 111. Snap-fit ​​connector; 12. Backlight box; 121. Snap-fit ​​bracket; 13. Light source mechanism;

[0025] 2. Brightness enhancement component; 21. Brightness enhancement film; 22. Light guide plate; 221. Light guide groove;

[0026] 3. Diffusion assembly; 31. Upper diffusion membrane; 32. Spacer column; 33. Lower diffusion membrane. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figure 1-5 As shown, this utility model provides a technical solution: a backlight module with a reasonable configuration of a diffusion film and a brightness enhancement film, including a backlight assembly 1, the backlight assembly 1 being composed of a mounting cover 11 and a backlight box 12, the mounting cover 11 being disposed above the backlight box 12, and also including;

[0029] The diffusion component 3 consists of an upper diffusion film 31 and a lower diffusion film 33 disposed inside the backlight box 12. Spacer pillars 32 are disposed below both the upper and lower diffusion films 31 and 33, arranged in a ring. The diameter of the spacer pillars 32 increases sequentially from the inside out. Light from the light source is initially scattered by the lower diffusion film 33. When light passes through the ring-shaped spacer pillars 32 with increasing diameters, the inner smaller-diameter spacer pillars 32 form dense support and small-area diffuse reflection, while the outer larger-diameter spacer pillars 32 expand the light diffusion radius, allowing the light to diffuse more effectively. The light beam follows a layered diffusion path of "dense scattering at the center and wide-angle diffusion at the edges" between the two diffusion films. Finally, it is uniformly output after secondary diffusion by the upper diffusion film 31. The annular variable diameter spacer 32 is designed to adapt to the surface light source characteristics of the backlight box 12. The central area improves the light diffusion accuracy through the dense spacer 32, while the edge area uses the large diameter spacer 32 to compensate for the light intensity attenuation, thereby improving the backlight uniformity. The layered diffusion structure reduces the use of a single thick film, thus reducing the thickness. At the same time, the variable diameter structure achieves a dual improvement in brightness uniformity and thinness with the same number of film layers through optical path optimization.

[0030] A brightness enhancement component 2 is disposed between the upper diffusion film 31 and the mounting cover 11. The brightness enhancement component 2 consists of a brightness enhancement film 21 and a light guide plate 22. The light guide plate 22 is disposed below the brightness enhancement film 21. The light, homogenized by the diffusion component 3, enters the light guide plate 22. Through the total internal reflection and refraction of the light guide groove 221 on its bottom surface, the surface light source is converted into uniformly transmitted parallel light. Then, the prism structure of the brightness enhancement film 21 constrains the angle of the light, causing the divergent light to converge in a direction perpendicular to the display surface, forming a highly concentrated emitted light. The light guide plate 22 integrates the diffused scattered light into an ordered beam through light transmission path planning, reducing lateral light energy loss. The prism array of the brightness enhancement film 21 further compresses the light divergence angle, thereby improving the center brightness and achieving synergistic optimization of backlight brightness uniformity and light emission efficiency, meeting the requirements of high-definition display for strong light efficiency.

[0031] The bottom of the light guide plate 22 is provided with a light guide groove 221. The light guide groove 221 is rectangularly distributed and the distance between two adjacent light guide grooves 221 is equal. When light enters the bottom of the light guide plate 22 from the light source mechanism 13, the rectangularly distributed and equally spaced light guide grooves 221 will regularly refract and reflect the light. Specifically, the inclined surface of the light guide groove 221 causes the light to undergo total internal reflection and guides the light to the upper surface of the light guide plate 22; while the diffuse reflection structure at the bottom of the groove scatters some of the light upward. The two effects work together to transform the line light source or point light source into a uniform surface light source.

[0032] A light source mechanism 13 is provided on the backlight box 12 below the lower diffusion film 33. There are two light source mechanisms 13. One light source mechanism 13 is arranged along the width direction of the backlight box 12, and the other backlight box 12 is arranged along the length direction of the backlight box 12. The two sets of orthogonally distributed light source mechanisms 13 project light along the width and length directions of the backlight box 12 respectively, forming a "cross" light source layout. The light emitted by the light source in the width direction is scattered laterally by the lower diffusion film 33, while the light from the light source in the length direction is simultaneously scattered longitudinally. The two form a bidirectional superimposed diffuse reflection field under the layered diffusion effect of the spacer column 32, and finally mix into a uniform surface light source through the upper diffusion film 31.

[0033] The mounting cover 11 has a snap-fit ​​component 111 at the bottom and the backlight box 12 has a snap-fit ​​bracket 121 at the top. The mounting cover 11 and the backlight box 12 are interlocked by the snap-fit ​​component 111 and the snap-fit ​​bracket 121. During installation, the snap-fit ​​component 111 is pushed in along the guide surface of the snap-fit ​​bracket 121, and the slot is locked by the elastic deformation of the structure, forming a mechanical limit. During disassembly, the snap-fit ​​component 111 is disengaged from the slot under the action of external force, and quick separation is completed. This structure uses geometric shape matching to achieve tool-free installation. At the same time, the tight fit of the snap-fit ​​surface can reduce the internal gap of the module and prevent light from leaking from the seam.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A backlight module with rationally arranged diffusion film and brightness enhancement film, comprising a backlight assembly (1) which is composed of a mounting cover (11) and a backlight box (12), the mounting cover (11) is arranged above the backlight box (12), characterized in that, Also includes; The diffusion assembly (3) consists of an upper diffusion film (31) and a lower diffusion film (33) disposed inside the backlight box (12). A spacer (32) is disposed below both the upper diffusion film (31) and the lower diffusion film (33). The spacer (32) is distributed in a ring and the diameter of the spacer (32) increases sequentially from the inside to the outside.

2. The backlight module with rationally configured diffusion film and brightness enhancement film according to claim 1, wherein: A light enhancement component (2) is provided between the upper diffusion film (31) and the mounting cover (11). The light enhancement component (2) is composed of a light enhancement film (21) and a light guide plate (22). The light guide plate (22) is located below the light enhancement film (21).

3. The backlight module with rationally configured diffusion film and brightness enhancement film according to claim 2, wherein: The bottom of the light guide plate (22) is provided with a light guide groove (221), the light guide groove (221) is rectangularly distributed, and the distance between two adjacent light guide grooves (221) is equal.

4. The backlight module with rationally configured diffusion film and brightness enhancement film according to claim 1, wherein: A light source mechanism (13) is provided on the backlight box (12) below the lower diffusion film (33). There are two light source mechanisms (13), one of which is arranged along the width direction of the backlight box (12) and the other is arranged along the length direction of the backlight box (12).

5. The backlight module with rationally configured diffusion film and brightness enhancement film according to claim 1, wherein: The mounting cover (11) is provided with a snap-fit ​​component (111) at the bottom, and the backlight box (12) is provided with a snap-fit ​​bracket (121) at the top. The mounting cover (11) and the backlight box (12) are snapped together by the snap-fit ​​component (111) and the snap-fit ​​bracket (121).

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