CN201028402Y - Light uniform element of surface light source - Google Patents

Abstract

The utility model relates to a light uniform element of area source mainly goes into the plain noodles under and all forms the light refraction structure in last plain noodles, makes light diffuser plate below fluorescent tube pass through earlier and go into the plain noodles once refraction back down, by last plain noodles secondary refraction again, so can effectively be with the even heat dissipation distribution of light of fluorescent tube, provide a most even plane light source.

Description

Light homogenizing elements for surface light sources

technical field

The utility model relates to a light uniform component of a surface light source, in particular to a light diffusion plate which diffuses the lower backlight light source more uniformly to form a uniform luminance.

Background technique

Since the liquid crystal itself does not have light-emitting properties, a backlight module is required for a flat-panel LCD display. Currently, the backlight module is generally divided into two types: side-type and direct-type. The biggest difference is the location of the lamp.

For the direct type backlight module, it mainly places multiple lamp tubes in a housing with a reflective layer to reflect the light of the lamp tubes upwards, and then installs a light diffusion plate, a diffusion sheet, and a prism at the opening of the housing Chips and other components to further mix the lamp light source more evenly, and then provide it to the upper liquid crystal layer as a flat light source for development.

Since the main requirement of LCD is light and thin appearance, in pursuit of this goal, the thickness of the direct-lit backlight module should not be too large. In this way, the position of the LCD panel near the light tube is brighter, and the brightness between the light tubes is lower. It is darker. Therefore, in order to make the light source of the backlight module more uniform, various manufacturers have invested resources in research and development on the light diffusion plate, so that the brightness of the light source of the light emitting plane is more uniform.

For example, China Taiwan Patent Publication No. 200519466 "diffusion plate and backlight module using the same", which discloses the structure of the diffusion plate of the backlight module, and the lower end surface of the diffusion plate is formed with a V-shaped groove structure , in order to achieve the purpose of uniform light diffusion. In addition, such as Taiwan Patent Announcement No. M252937 "Diffusing Plate with Diffusion Particle Layer" utility model patent, a diffusion particle layer is added to the diffusion plate. Since the diffusion particles in the diffusion particle layer have a relative refractive index, they can refract light. To achieve the purpose of uniform diffusion.

Compared with the lamp tube and the liquid crystal panel, the light diffusion plate has a lower light-incoming surface and an upper light-emitting surface, and the design of the above two kinds of diffusion plates and the current light-diffusing design of the diffusion plate are only for the lower light-incoming surface or the upper light-emitting surface Improvements are made, so the effect of uniform light diffusion is limited, and neither is optimal.

Utility model content

The main purpose of the utility model is to provide a light uniform element of a surface light source, which has a high uniform light diffusion degree, and effectively improves the uniformity of the light source from a plane.

The main technical means used to achieve the above purpose is to make the light uniform element of the surface light source include:

an upper light emitting surface forming a non-planar refractive structure; and

A non-planar refraction structure is formed on the light incident surface.

The non-planar refraction structures are respectively continuous regular, continuous irregular, discontinuous regular or discontinuous irregular concave or convex refraction structures. In this way, when the lamp light source under the light diffusion plate enters the lower light-incoming surface, it will be refracted once first, and then the light will be refracted a second time when it encounters the upper light-emitting surface, so that the light scattering is more uniform.

Description of drawings

Fig. 1: It is a side view of a light diffusion plate arranged in a direct-down type backlight module according to the first preferred embodiment of the present invention.

Fig. 2: is the three-dimensional sectional view of the second preferred embodiment of the present utility model.

Fig. 3: is the three-dimensional sectional view of the third preferred embodiment of the present invention.

Fig. 4: is a three-dimensional sectional view of the fourth preferred embodiment of the present invention.

Fig. 5: It is the three-dimensional sectional view of the fifth preferred embodiment of the present utility model.

Fig. 6: It is the three-dimensional sectional view of the sixth preferred embodiment of the present utility model.

Fig. 7: It is a three-dimensional sectional view of the seventh preferred embodiment of the present utility model.

Fig. 8 is a three-dimensional sectional view of the eighth preferred embodiment of the present invention.

Fig. 9: is a three-dimensional sectional view of the ninth preferred embodiment of the present invention.

Fig. 10 is a three-dimensional sectional view of the tenth preferred embodiment of the present invention.

[Description of main component symbols]

(10) Backlight module (11) Reflective bottom cover

(12) Lamp (13) Diffuser

(14) Rhombus lens (20) Light diffusion plate

(21) Upper light emitting surface (211) Bump

(211a)～(211d) bumps

(212) groove (213) rough surface

(22) Lower incident light surface (221) Bump

(222) groove (223) rough surface

Detailed ways

First please refer to FIG. 1, which is a side view of a light diffusion plate 20 of the present invention arranged on a direct-down backlight module, wherein the backlight module 10 generally includes a reflective bottom cover 11 arranged in plural on the reflective bottom from bottom to top. The lamp tube 12, the light diffusion plate 20, the light diffusion sheet 13, the diamond sheet 14, etc. of the cover 11; and the light diffusion plate 20 of the present utility model mainly forms continuous regular and continuous irregular surfaces on the upper light-emitting surface 21 and the lower light-incoming surface 22, respectively. Or discontinuous concave refraction structure or convex refraction structure.

In this embodiment, the material of the light diffusion plate 20 can be selected from PMMA (polymethyl methacrylate), PC (polycarbonate), PET (polyethylene terephthalate), GLASS (glass), etc. A transparent or translucent material whose structure is:

A plurality of parallel V-shaped grooves 212 are formed on the upper light-emitting surface 21 to form a continuous concave refraction structure; and

Irregular hemispherical bumps 221 are partially arranged side by side on the lower light incident surface 22 corresponding to the positions of the lamp tubes to form a discontinuous convex refraction structure.

From the structure of this embodiment, it can be known that the V-shaped grooves 212 on the upper light emitting surface are all of the same size, so they present a continuous and regular concave refraction structure. If the sizes of the V-shaped grooves are different, they will present a continuous and irregular concave refraction structure. .

Please refer to Fig. 2 , which is the second preferred embodiment of the present utility model. The upper light-emitting surface 21 forms a plurality of side-by-side zigzag-shaped protrusions 211a to form a continuous convex refraction structure, while the lower light-incoming surface 22 corresponds to the lamp tube. Irregular hemispherical bumps 221 are partially arranged side by side to form a discontinuous and irregular convex reflection structure.

Please refer to Fig. 3, which is the third preferred embodiment of the present utility model, its upper light-emitting surface 21 is the same as the second preferred embodiment, and its lower light-incoming surface 22 corresponds to the position of the lamp tube to form a local side-by-side irregularity The hemispherical groove 222 forms a discontinuous and irregular concave reflective structure.

Please refer to Fig. 4, which is the fourth preferred embodiment of the present utility model, where the upper light-emitting surface 21 forms a plurality of semi-cylindrical bumps 211b parallel and side by side to form a continuous regular convex reflection structure, while the lower light-incoming surface is aligned with The second preferred embodiment is the same.

Please refer to Fig. 5, which is the fifth preferred embodiment of the present utility model. The upper light-emitting surface 21 forms a plurality of parallel semi-cylindrical bumps 211b side by side to form a continuous regular convex reflection structure, while the lower light-incidence surface 22 is Same as the third preferred embodiment.

Please refer to Fig. 6, which is the sixth preferred embodiment of the present utility model, in which a plurality of hemispherical bumps 211c are formed on the upper light emitting surface 21, and the size of the hemispherical bumps will vary with the distance between the light diffusing plate and the lamp tube. And adjusted to form a continuous regular convex reflective structure, and the lower light-incident surface 22 is the same as the second preferred embodiment.

Please refer to Fig. 7, which is the seventh preferred embodiment of the present utility model, where the upper light-emitting surface 21 forms a plurality of side-by-side hemispherical bumps 211c to form a continuous regular convex reflection structure, while the lower light-incident surface 22 is aligned with The third preferred embodiment is the same.

Please refer to Fig. 8, which is the eighth preferred embodiment of the present utility model, on which a plurality of parallel quadrangular pyramid protrusions 211d are formed on the light-emitting surface 21 to form a continuous regular convex reflection structure, wherein the quadrangular pyramid size will vary with The distance between the light diffusing plate and the lamp tube is adjusted, and the lower light incident surface 22 is the same as the second preferred embodiment.

Please refer to Fig. 9, which is the ninth preferred embodiment of the present utility model, where the upper light-emitting surface 21 forms a plurality of parallel quadrangular pyramid protrusions 211d to form a continuous regular convex reflection structure, while the lower light-incident surface 22 is aligned with The third preferred embodiment is the same.

Please refer to Fig. 10 , which is the tenth preferred embodiment of the present utility model. The upper light-emitting surface 21 and the lower light-incident surface 22 of the light diffusion plate are respectively formed with reflective structures of rough surfaces 213 and 223. The distance between the diffuser plate and the lamp tube is adjusted.

It can be seen from the above description that the upper light-emitting surface and the lower light-incoming surface of the light diffusion plate of the present invention can be respectively formed with continuous/discontinuous regular or irregular V-shaped grooves, semi-cylindrical, semi-circular, quadrangular pyramids and rough surfaces. The shape of the convex reflective structure or the concave reflective structure. Since the utility model mainly forms a light refraction structure on the upper light-emitting surface and the lower light-incoming surface, the lamp tube under the light diffusion plate is firstly refracted by the lower light-incoming surface, and then refracted by the upper light-emitting surface for the second time, so that it can effectively Evenly dissipate the light of the lamp tube to provide the most uniform plane light source for the upper LCD panel.

Claims (10)

1. the even element of the light of an area source is characterized in that, includes:

Exiting surface on one is formed with an on-plane surface refraction structure; And

Once incidence surface is formed with an on-plane surface refraction structure.

2. the even element of the light of area source according to claim 1 is characterized in that, wherein:

The on-plane surface refraction structure that should go up exiting surface is a continuous recessed refraction structure; And

The on-plane surface refraction structure of this time incidence surface is a continuous recessed refraction structure.

3. the even element of the light of area source according to claim 1 is characterized in that, wherein:

The on-plane surface refraction structure that should go up exiting surface is a discontinuous recessed refraction structure; And

The on-plane surface refraction structure of this time incidence surface is a continuous recessed refraction structure.

4. the even element of the light of area source according to claim 1 is characterized in that, wherein:

The on-plane surface refraction structure that should go up exiting surface is a continuous recessed refraction structure; And

The on-plane surface refraction structure of this time incidence surface is a discontinuous recessed refraction structure.

5. the even element of the light of area source according to claim 1 is characterized in that, wherein:

The on-plane surface refraction structure that should go up exiting surface is a discontinuous recessed refraction structure; And

The on-plane surface refraction structure of this time incidence surface is a discontinuous recessed refraction structure.

6. the even element of the light of area source according to claim 1 is characterized in that, wherein:

The on-plane surface refraction structure that should go up exiting surface is a convex row refraction structure; And

The on-plane surface refraction structure of this time incidence surface is a convex row refraction structure.

7. the even element of the light of area source according to claim 1 is characterized in that, wherein:

The on-plane surface refraction structure that should go up exiting surface is a discontinuous protruding refraction structure; And

The on-plane surface refraction structure of this time incidence surface is a convex row refraction structure.

8. the even element of the light of area source according to claim 1 is characterized in that, wherein:

The on-plane surface refraction structure that should go up exiting surface is a convex row refraction structure; And

The on-plane surface refraction structure of this time incidence surface is a discontinuous protruding refraction structure.

9. the even element of the light of area source according to claim 1 is characterized in that, wherein:

The on-plane surface refraction structure that should go up exiting surface is a discontinuous protruding refraction structure; And

The on-plane surface refraction structure of this time incidence surface is a discontinuous protruding refraction structure.

10. the even element of the light of area source according to claim 1 is characterized in that, on this exiting surface and down the on-plane surface refraction structure of incidence surface be a matsurface.

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