CN201083930Y - Improved structure of backlight module - Google Patents

Abstract

The utility model discloses backlight module includes at least: the light source forms light incidence from one side of the light incidence surface of the light guide plate, the bottom surface and the light emergence surface of the light guide plate are respectively provided with X, Y-direction arranged optical structures, the diffusion sheet is arranged above the light emergence surface of the light guide plate, the diffusion sheet is provided with a light incidence surface and a light emergence surface opposite to the light incidence surface, and at least one side of the light incidence surface and the light emergence surface is provided with a plurality of dots, so that the light rays entering the diffusion sheet can generate the light ray scattering effect by the dots, and the problem that the conventional backlight module obviously presents bright and dark belt regions is effectively solved.

Description

Improved backlight module structure

technical field

The utility model provides an improved structure of a backlight module, aiming at providing an improved structure of the backlight module which can distribute light from a light source more effectively without forming bright and dark bands.

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 an optical structure 121 in the shape of a continuous zigzag groove on the upper and lower surfaces of the light guide plate 12, which is arranged on the upper and lower plates of the light guide plate 12. The optical structures 121 on the surface are arranged in the X and Y directions respectively. For example, the optical structures 121 on the upper surface are arranged vertically, while the optical structures 121 on the lower surface are arranged horizontally, so that the direct light incident from the light source 10 passes through the guide. After the light plate 12 is converted into vertical plane light, the optical structure 121 on the surface of the light guide plate 12 collects the light in the X and Y directions and adjusts the divergence angle of the light, and has the functions of concentrating and increasing light; however, although the light guide plate It can make the light emitted by the light source have the effect of increasing light, and can reduce the use of the light-enhancing film, but it is easy to appear the phenomenon of bright and dark lines on the side, and each optical structure may cause uneven brightness and darkness due to the traces produced by processing. Shortcomings.

Utility model content

The main purpose of the utility model is to provide an improved structure of the backlight module which can distribute light from the light source more effectively without forming bright and dark bands.

In view of this, the backlight module of the present utility model at least includes: a light guide plate, a light source and a diffusion sheet, the light source forms light from one side of the light incident surface of the light guide plate, and the bottom surface and the light output surface of the light guide plate are respectively provided with X , the optical structure arranged in the Y direction, the diffuser is arranged above the light-emitting surface of the light guide plate, the diffuser has a light-incident surface, and a light-exit surface opposite to the light-incidence surface, and at least There are a plurality of dots on one side, so that the light entering the diffuser can be diffused by each dot, which effectively solves the problem of obvious bright and dark bands in conventional backlight modules.

The beneficial effects of the utility model are:

1. The light incident surface and the light exit surface of the light guide plate of the utility model are respectively provided with optical structures arranged in X and Y directions, so that the light emitted from the light guide plate can be completely distributed on the entire surface of the light guide plate, which can save the cost of the light-enhancing film. use, thereby reducing the thickness of the overall backlight module.

2. With the network dots set on the diffuser, the light in the originally unevenly bright and dark areas can be evened out without forming bright and dark bands, and the light from the light source can be distributed more effectively.

3. Each dot can be set according to the position of the bright and dark lines, and in the area where the bright line is more obvious, set a dot with a larger area to even out the light in the area.

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;

3 is a schematic side view of the backlight module of the first embodiment of the present invention;

4 is a perspective view of the structure of the backlight module of the second embodiment of the present invention;

5A and B are structural perspective views of the backlight module of the third embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a backlight module according to a fourth embodiment of the present invention;

7 is a structural perspective view of a backlight module according to a fourth embodiment of the present invention;

8A and 8B are structural perspective views of the backlight module of the fifth embodiment of the present invention.

【Description of figure number】

Backlight module 1 Light source 10

Reflector 11 Light guide plate 12

Optical structure 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 Optical structure 24

Light source 3 Diffuser 4

Light incident surface 41 Light exit surface 42

Dot 43 Prism sheet 5

Reflector 6

Detailed ways

The utility model "backlight module structure improvement", as shown in Figure 1, the basic structure of the backlight module is shown in Figure 3, which at least includes:

The light guide plate 2, the light guide plate 2 has a light incident surface 21, a bottom surface 22 intersecting the light incident surface 21, and a light exit surface 23 opposite to the bottom surface 22, the bottom surface 22 and the light exit surface 23 are constructed with a plurality of grooves Groove-shaped optical structure 24, the optical structures 24 of the bottom surface 22 and the light-emitting surface 23 are arranged in the X and Y directions respectively. In the embodiment shown in the figure, the optical structures 24 of the bottom surface 22 are arranged horizontally, and the light-emitting surface 23 The optical structures 24 form a vertical arrangement.

The reflection sheet 6 is disposed on a side corresponding to the bottom surface 22 of the light guide plate.

The light source 3 is arranged on a side corresponding to the light incident surface 21 of the light guide plate.

The diffuser 4 is arranged above the light-emitting surface 23 of the light guide plate. The diffuser 4 has a light-incident surface 41 and a light-exit surface 42 opposite to the light-incidence surface 41. At least one of the light-incidence surface 41 and the light-exit surface 42 is There are a plurality of dots 43 on the side, as shown in the figure, each dot 43 protrudes from the surface of the light-emitting surface 42, and is arranged in parallel with the optical structure 24 on the light-emitting surface 23 of the light guide plate, and each dot 43 can be selectively set on Places where bright and dark lines are likely to appear, for example, on the side, or places corresponding to traces of the optical structures 24 of the light guide plate that may be produced due to processing, resulting in uneven brightness and darkness of the display effect, as shown in the second embodiment of Figure 4 Shown, and the arrangement of different sizes or shapes can be formed among the network dots 43, and the network dots 43 with larger area can be arranged on the area where the bright lines are more obvious.

When the light from the light source 3 enters from the light incident surface 21 of the light guide plate, as shown in FIG. The effect of light scattering is generated by each dot 43 to even out the light where bright and dark lines or uneven light and dark should appear, effectively solving the problem of obvious bright and dark bands in conventional backlight modules.

As shown in the third embodiment of FIG. 5A, a plurality of dots 43 are arranged on the light-emitting surface 42 of the diffusion sheet 4, and each dot 43 is recessed on the surface of the light-emitting surface 42, and each dot 43 can be connected to the light-emitting surface 23 of the light guide plate. The optical structure 24 on the light guide plate is arranged in parallel; of course, as shown in Figure 5B, each dot 43 is recessed on the surface of the light-emitting surface 42, but it is not arranged in parallel with the optical structure 24 on the light-emitting surface 23 of the light guide plate. The settings of its dots 43 can be selectively set at places where bright and dark lines are likely to appear.

As shown in the fourth embodiment of FIGS. 6 and 7 , the optical structures 24 on the bottom surface 22 of the light guide plate 2 are arranged vertically, while the optical structures 24 on the light-emitting surface 23 are arranged horizontally, and the light-incident surface of the diffuser 4 41 and the light-emitting surface 42 are provided with a plurality of dots 43, and each dot 43 is arranged horizontally with the optical structure 24 on the light-emitting surface 23, and a prism sheet 5 can be further provided between the light guide plate 2 and the diffusion sheet 4, The effect of uniformly scattering light can also be achieved.

As shown in the fifth embodiment of FIG. 8A , the optical structures 24 on the bottom surface 22 of the light guide plate 2 are arranged obliquely (non-perpendicular or parallel), while the optical structures 24 on the light-emitting surface 23 are also arranged obliquely, and are optically aligned with the bottom surface. The inclination angles of the structures 24 are different, and the light-emitting surface 42 of the diffusion sheet 4 is provided with a plurality of dots 43, and each dot 43 is arranged parallel to the optical structure 24 on the light-emitting surface 23; or as shown in FIG. 8B, each dot 43 is It is arranged parallel to the optical structure 24 on the bottom surface 22 .

It is worth mentioning that the utility model has the following advantages compared with the conventional ones:

1. The light incident surface and the light exit surface of the light guide plate of the utility model are respectively provided with optical structures arranged in X and Y directions, so that the light emitted from the light guide plate can be completely distributed on the entire surface of the light guide plate, which can save the cost of the light-enhancing film. use, thereby reducing the thickness of the overall backlight module.

2. With the network dots set on the diffuser, the light in the originally unevenly bright and dark areas can be evened out without forming bright and dark bands, and the light from the light source can be distributed more effectively.

3. Each dot can be set according to the position of the bright and dark lines, and in the area where the bright line is more obvious, set a dot with a larger area to even out the light in the area.

As mentioned above, the utility model provides another preferable and feasible structural improvement of the backlight module, so an application for a new patent is submitted according to the law; however, the above implementation description and drawings are preferred embodiments of the utility model, not The present utility model is limited in this way, 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 (8)

1. A structural improvement of a backlight module, characterized in that it at least includes: A light guide plate, the light guide plate has 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 a plurality of groove-shaped optical structures, the bottom surface and The optical structure of the light-emitting surface is arranged in the X and Y directions respectively; The light source is arranged on the side corresponding to the light incident surface of the light guide plate; The diffuser is arranged above the light-emitting surface of the light guide plate. The diffuser has a light-incident surface and a light-exit surface opposite to the light-incidence surface. At least one side of the light-incidence surface and the light-exit surface is provided with a plurality of dots. 2 . The improved structure of the backlight module according to claim 1 , wherein the optical structures on the bottom surface are arranged vertically, and the optical structures on the light-emitting surface are arranged horizontally. 3 . The improved structure of the backlight module according to claim 1 , wherein the optical structures on the bottom surface are arranged horizontally, and the optical structures on the light emitting surface are arranged vertically. 4 . 4 . The structural improvement of the backlight module according to claim 1 , wherein a plurality of dots are provided on the light-incident surface and the light-exit surface of the diffuser. 5. The structural improvement of the backlight module according to claim 1, wherein the size or shape of each dot is different. 6 . The improved structure of the backlight module according to claim 1 , wherein each dot is recessed or protruded from the surface. 7. The structural improvement of the backlight module according to claim 1, wherein a prism sheet is further provided between the light guide plate and the diffusion sheet. 8 . The improved structure of the backlight module according to claim 1 , wherein the optical structure on the bottom surface is arranged obliquely, and the optical structure on the light emitting surface is also obliquely arranged at a different angle from the optical structure on the bottom surface.

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