CN201083843Y - Light guide plate and backlight module - Google Patents

Abstract

The light guide plate of the present invention at least comprises a light incident surface, a bottom surface intersecting with the light incident surface, and a light emitting surface opposite to the bottom surface, wherein the light source is disposed at one side corresponding to the light incident surface, a plurality of grooves are formed on the bottom surface and the light emitting surface, and the grooves on the bottom surface and the light emitting surface are respectively arranged in X, Y directions; the grooves on one side of the bottom surface or the light-emitting surface are vertically arranged, the cross section of each vertically arranged groove is provided with a vertex angle B, the value range of the vertex angle B in each groove is more than or equal to 60 degrees and less than or equal to 140 degrees, and the vertex angle B is not equal to 90 degrees, so that the luminance of the backlight module can be improved when the backlight module is applied to the backlight module.

Description

Light guide plate and backlight module

technical field

The utility model provides a light guide plate, aiming at providing a light guide plate which can be applied in a backlight module and can improve the luminance of the backlight module.

Background technique

Liquid crystal displays with side-lit backlight units are widely used in notebook computers, vehicle displays, mobile phones, and other fields due to their small size, light weight, and uniform brightness. The backlight module of the liquid crystal display is an optical mechanism that can convert scattered point light sources or line light sources into uniform plane light sources. With the expansion of the application field of liquid crystal displays, higher requirements are put forward for the backlight technology based on the light guide plate, which is mainly manifested in: high brightness, low cost, low energy consumption, light and thin, etc.

As shown in FIG. 1 , a conventional backlight module 1 includes a light source 10 , a light guide plate 12 , several optical films and a display panel 14 . According to different functions, the optical films include: a reflector 11 and a diffuser 13 . The reflective sheet 11 guides unscattered light into the light guide plate 12 , and the diffuser sheet 13 diffuses and evenly diffuses the light, eliminating bright areas formed by microstructures on the light guide plate 12 .

Among them, the main function of the light guide plate 12 is to convert the straight light incident by the light source 10 into vertical plane light by the principle of light scattering. Two brightness enhancement films 15 are added, and an optical structure 151 (the optical structure is in the shape of a continuous zigzag groove) is provided on the upper surface of each brightness enhancement film 15 to achieve the effect of scattering and uniform light; however, additional brightness enhancement films The use of the light guide plate not only increases the cost, but also the light guide in the light guide plate 12 is caused by total reflection, and the light emitted from the light guide plate 12 cannot be completely distributed on the entire surface of the light guide plate 12 .

Therefore, there is another conventional light guide plate structure. As shown in FIG. 2 , the light guide plate 12 is directly constructed with a continuous zigzag groove structure 121 on the upper and lower surfaces of the light guide plate 12. The grooves 121 are respectively arranged in the X and Y directions. For example, the grooves 121 on the upper surface are arranged vertically, while the grooves 121 on the lower surface are arranged horizontally, so that the straight light incident from the light source 10 is converted by the light guide plate 12 After forming vertical plane light, it passes through the grooves 121 on the surface of the light guide plate 12 to collect the light in the X and Y directions and adjust the divergence angle of the light, and has the effect of concentrating and increasing light; however, the grooves 121 of the light guide plate The section has an apex angle A, as shown in FIG. 3, the apex angle A is 90 degrees, and is especially located on the vertically arranged grooves 121, so that the light entering the light guide plate cannot be obtained after passing through each groove 121. Excellent brightness performance.

Utility model content

The main purpose of the utility model is to provide a light guide plate which can be applied in a backlight module and can improve the luminance of the backlight module.

In view of this, the light guide plate of the present invention at least includes a light incident surface, a bottom surface intersecting the light incident surface, and a light exit surface opposite to the bottom surface, and the light source is arranged on a side corresponding to the light incident surface, The bottom surface and the light-emitting surface are constructed with a plurality of grooves, and the grooves on the bottom surface and the light-emitting surface are arranged in the X and Y directions respectively; wherein the grooves on the bottom surface or the light-emitting surface are arranged vertically, and the cross-section of the vertically arranged grooves has A top angle B, the value range of the top angle B in each groove is 60 degrees≤B≤140 degrees, and the top angle B is not equal to 90 degrees, when used in a backlight module, the brightness of the backlight module can be improved.

The beneficial effect of the utility model is that a light guide plate that can be applied to a backlight module and can improve the luminance of the backlight module can be obtained.

Description of drawings

FIG. 1 is a schematic side view of a conventional backlight module;

FIG. 2 is a schematic side view of another conventional backlight module;

FIG. 3 is a partially enlarged schematic view of the light guide plate in FIG. 2;

4 is a perspective view of the structure of the light guide plate of the first embodiment of the present invention;

Fig. 5 is a partially enlarged schematic diagram of the light guide plate of the first embodiment of the present invention;

FIG. 6 is a structural schematic diagram of the light guide plate of the present invention applied to the backlight module;

7 is a perspective view of the structure of the light guide plate of the second embodiment of the present invention;

FIG. 8 is a partially enlarged schematic view of a light guide plate according to a second embodiment of the present invention.

【Description of figure number】

Backlight module 1 Light source 10

Reflector 11 Light guide plate 12

Groove 121 Diffuser 13

Display panel 14 Brightening film 15

Optical structure 151 Light guide plate 2

Light incident surface 21 Bottom surface 22

Light-emitting surface 23 Groove 24

Light source 3 Reflector 4

Optical film 5 Diffuser 51

Prism sheet 52 Panel 6

Detailed ways

The light guide plate and the backlight module of the utility model, as shown in Figure 4, the basic structure of the light guide plate 2 is shown in Figure 4, which at least includes: a light incident surface 21, a bottom surface 22 intersecting with the light incident surface 21 , and a light-emitting surface 23 opposite to the bottom surface 22, and the light source 3 is arranged on the side corresponding to the light-emitting surface 21, the bottom surface 22 and the light-emitting surface 23 are constructed with a plurality of grooves 24, the bottom surface 22 and the light-emitting surface 23 The grooves are respectively arranged in X and Y directions. In the embodiment shown in the figure, the grooves 24 on the bottom surface 22 are arranged horizontally, while the grooves 24 on the light-emitting surface 23 are arranged vertically.

The key point of this case is that the section of each groove 24 has an apex angle B. Also refer to FIG. B is not equal to 90 degrees, so that the light from the light source 3 can have a better emission angle after passing through each groove 24; of course, the value range of the apex angle B of each groove section of the light-emitting surface can also be 60 degrees ≤ B ≤140 degrees, and the top angle B is not equal to 90 degrees.

As shown in Figure 6, it is a structural schematic diagram of the application of the light guide plate of the present invention to the backlight module. The backlight module at least includes: the above-mentioned light guide plate 2, light source 3, reflection sheet 4, multiple optical films 5 and a panel 6, the The light source 3 is arranged on one side corresponding to the light incident surface 21 of the light guide plate. The light source 3 can be a line light source or a point light source (as shown in FIG. 7 ), and the reflective sheet 4 is arranged under the light guide plate 2. The panel 6 is sequentially arranged on the top of the light guide plate 2, wherein each optical film can be a prism sheet 52 and a diffusion sheet 51, and the light from the light source 3 can have better The emission angle to improve the luminance of the overall backlight module.

In the second embodiment shown in FIGS. 7 and 8 , the grooves 24 on the light-emitting surface 23 are arranged horizontally, while the grooves 24 on the bottom surface 22 are arranged vertically. The value range is 60 degrees≤B≤140 degrees, and the apex angle B is not equal to 90 degrees, so that the light from the light source 3 can have a better emission angle after passing through each groove 24; of course, the cross-section of each groove on the light-emitting surface The value range of the apex angle B can also be 60 degrees≤B≤140 degrees, and the apex angle B is not equal to 90 degrees.

As mentioned above, the utility model provides another preferable and feasible light guide plate and backlight module, so the application for a new patent is filed according to law; however, the above implementation description and drawings are the preferred embodiments of the utility model, This is not to limit the present utility model, therefore, all similar and identical structures, devices, features, etc. of the present utility model should belong to the creation purpose of the present utility model and within the scope of the patent application.

Claims (9)

1. A light guide plate, the light guide plate at least includes a light incident surface, a bottom surface intersecting the light incident surface, and a light exit surface opposite to the bottom surface, the bottom surface and the light exit surface are constructed with multiple grooves, the bottom surface and the grooves on the light-emitting surface are arranged in the X and Y directions respectively; it is characterized in that: Each groove section on at least one side of the bottom surface or the light-emitting surface has an apex angle B, and the value range of the apex angle B in each groove is 60°≤B≤140°, and the apex angle B is not equal to 90°. 2. The light guide plate according to claim 1, wherein the grooves on the bottom surface are arranged vertically, while the grooves on the light-emitting surface are arranged horizontally, and the value of the apex angle B of each groove section on the bottom surface is The range is 60 degrees ≤ B ≤ 140 degrees, and the apex angle B is not equal to 90 degrees. 3 . The light guide plate according to claim 2 , wherein the vertex angle B of each groove cross-section on the light-emitting surface ranges from 60 degrees ≤ B ≤ 140 degrees, and the vertex angle B is not equal to 90 degrees. 4 . 4. The light guide plate according to claim 1, wherein the grooves on the bottom surface are arranged horizontally, and the grooves on the light-emitting surface are arranged vertically, and the angle B of the cross-section of each groove on the light-emitting surface is taken as The value range is 60 degrees ≤ B ≤ 140 degrees, and the apex angle B is not equal to 90 degrees. 5 . The light guide plate according to claim 2 , wherein the value range of the apex angle B of each groove section on the bottom surface is 60°≤B≤140°, and the apex angle B is not equal to 90°. 6. A backlight module utilizing the light guide plate according to claim 1, wherein the light guide plate at least comprises a light incident surface, a bottom surface intersecting the light incident surface, and a light exit surface opposite to the bottom surface , the bottom surface and the light-emitting surface are constructed with a plurality of grooves, and the grooves on the bottom surface and the light-emitting surface are arranged in the X and Y directions respectively; the cross-section of each groove on at least one side of the bottom surface or the light-emitting surface has a vertex angle B, and each groove The value range of the apex angle B is 60°≤B≤140°, and the apex angle B is not equal to 90°; a light source is provided on one side of the light incident surface of the light guide plate. 7. The backlight module according to claim 6, wherein a plurality of optical films and panels are arranged above the light guide plate. 8. The backlight module according to claim 7, wherein each optical film is a prism film or a diffusion film. 9. The backlight module according to claim 6, wherein a reflective sheet is disposed under the light guide plate.

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