JP3114466U - Light guide structure of direct type backlight module - Google Patents

Abstract

Provided is a light guide structure for a direct type backlight module that effectively distributes light rays from a light source and erases dark areas.
A light guide structure 33 of a direct type backlight module includes a reflective cover 10, a plurality of light sources 20, a diffusion plate 30, several optical film pieces 40, and a liquid crystal face plate 50 in order from the inside to the outside. . Among them, a plurality of light guide structures 33 are formed on the light entrance surface 31 and the light exit surface 32 of the diffusion plate, and are installed so that the light beam of the light source passes through the light guide structure of the diffusion plate. Since the light beam that has passed through the light guide structure diffuses at least twice, the light beam of the light source is distributed more effectively.
[Selection] Figure 2

Description

The present invention relates to a light guide structure of a backlight module, and more particularly to a direct type.

A liquid crystal monitor, which is a general electronic device, selects an architecture of a direct type or a side light source type module according to actual requirements. FIG. 1 shows a basic structure instruction diagram of a direct type backlight module. In this structure, the reflection cover 10, the plurality of light sources 20, the diffusion plate 30, the plurality of optical film pieces 40, and the liquid crystal face plate 50 are installed in this order from the inside to the outside. Among them, each light source 20 is linear, U-shaped, or other continuous curved shape, and is installed between the reflective cover 10 and the diffusion plate 30 at an appropriate interval. The display effect of the liquid crystal module is constituted by light rays emitted from each light source 20. Several optical film pieces 40 between the diffusing plate 30 and the liquid crystal face plate 50 often found in the market are 1 to 3 diffusing pieces, 0 to 2 brightening pieces, 0 to 1 reflective polarization polarization etc. Are combined with each other, and the action diffuses the light rays that pass through. A light-free area occurs at the interval between the light sources, and a light-dark area phenomenon occurs on the liquid crystal module.

However, only the action of the diffusing plate 30 causes the light rays that have passed through to be emitted uniformly, and there is a limit to improving the bright and dark areas on the liquid crystal module. For this reason, in some backlight modules, the space between the light source 20 and the diffusion plate 30 is intentionally widened, and the range in which the light source 20 enters the diffusion plate 30 is widened to reduce the formation of dark areas. However, even this structure is not effective, and the thickness of the backlight module increases, which goes against the thinning of today's liquid crystal modules.

The problem to be solved is that a light-free part occurs in the interval part of each light source, and the phenomenon of bright and dark areas occurs on the liquid crystal module. For improvement, when the space between the light source and the diffusion plate is widened, the liquid crystal module The overall thickness increases, which is a point that goes against the trend of thinning.

In the present invention, a reflective cover, a plurality of light sources, a diffusion plate, several optical film pieces, and a liquid crystal face plate are sequentially installed from the inside to the outside. Among them, a plurality of light guide structures are formed on the light entrance surface and the light exit surface of the diffuser plate, and are installed so that the light beam of the light source passes through the light guide structure of the diffuser plate. Since the light beam that has passed through the light guide structure is diffused at least twice, the most important feature is to distribute the light beam of the light source more effectively.

The light guide structure of the direct type backlight module according to the present invention has an advantage in that the light from the light source is effectively distributed and the dark area is eliminated.

As shown in FIG. 2, the direct type backlight module is provided with a reflective cover 10, a plurality of light sources 20, a diffusion plate 30, several optical film pieces 40, and a liquid crystal face plate 50 in this order.
Among them, the optical film piece 40 is configured by combining 1 to 3 diffusion pieces, 0 to 2 brightening pieces, 0 to 1 reflective polarizing pieces, and the like. Each light source 20 is a linear, U-shaped or other continuously curved light tube, and is installed between the reflective cover 10 and the diffuser plate 30 at an appropriate interval. The monitor effect of the liquid crystal module is composed of light rays emitted from each light source 20.

The diffusion plate 30 has a light incident surface 31 and a light output surface 32, and a plurality of light guide structures 33 are formed thereon. In this embodiment, the interval between the light guide structures 33 is less than or equal to 1 mm. As described above, the light beams from each light source 20 are subjected to the diffusing action of the light guide structure 33 at least twice by the installation of the light guide structure 33 of the diffusion plate 30 before entering the liquid crystal face plate 50, and the backlight. The module displays the expected brightness, erases the dark space between each light source, and distributes the light source light more effectively.

As shown in FIGS. 2 and 3, each light guide structure 33 is a V-shaped projecting structure as shown in the figure. In this embodiment, the height of each light guide structure 33 is smaller than or equal to 0.5 mm. Or a plurality of V-shaped grooves are concave (see FIG. 3) and the depth of each light guide structure is less than or equal to 0.5 mm. The protruding structure or the concave structure is integrally installed at the arrangement site. At this time, in addition to the projecting structure or the concave shape, a structure having a different geometric shape may be used, and as shown in FIG.

It is a structure instruction | indication figure of a well-known direct type backlight module. It is an application arrangement state diagram of the direct type backlight module of the present invention. It is a three-dimensional exploded view of the diffusion plate of the present invention. It is a three-dimensional exploded view of another diffusion plate of the present invention.

Explanation of symbols

10 Reflective cover
20 Light source
30 Diffuser
31 Incident surface
32 Light emitting surface
33 Light guide structure
40 Optical film pieces
50 LCD faceplate

Claims (8)

In the light guide structure of the direct type backlight module, which is a backlight module in which a reflective cover, a plurality of light sources, a diffusion plate, several optical film pieces and a liquid crystal face plate are installed in order from the inside to the outside,
The diffuser plate is formed with a plurality of light guide structures on the light incident surface and the light exit surface, and the light beam of the light source undergoes diffusion at least twice by the light guide structure of the diffuser plate before entering the liquid crystal face plate. A light guide structure for a direct type backlight module, wherein light rays from a light source are effectively distributed. 2. The light of a direct type backlight module according to claim 1, wherein each of the light sources is a straight, U-shaped or other continuously curved light tube, and is installed between the reflection cover and the diffusion plate at an appropriate interval. Guide structure. 2. The light guide structure of a direct type backlight module according to claim 1, wherein each of the light guide structures is integrally formed as a protruding structure of the portion. The light guide structure of a direct type backlight module according to claim 1, wherein each of the light guide structures is integrally formed as a concave shape of the portion. 2. The light guide structure of a direct type backlight module according to claim 1, wherein each of the light guide structures is integrally formed as a U-shaped or V-shaped shape of the portion. The light guide structure of a direct type backlight module according to claim 1, wherein each of the light guide structures has an interval smaller than or equal to 1 mm. 4. The light guide structure of a direct type backlight module according to claim 3, wherein each light guide structure has a height smaller than or equal to 0.5 mm. 5. The light guide structure of a direct type backlight module according to claim 4, wherein each of the light guide structures has a depth smaller than or equal to 0.5 mm.