CN1510482A

CN1510482A - Direct Type Backlight Module

Info

Publication number: CN1510482A
Application number: CNA021584222A
Authority: CN
Inventors: 杨邦伦
Original assignee: BenQ Corp
Current assignee: BenQ Corp
Priority date: 2002-12-24
Filing date: 2002-12-24
Publication date: 2004-07-07

Abstract

A direct type backlight module includes: a light guide plate having a light incident surface and a light emitting surface, wherein the light emitting surface is above the light incident surface, and the light incident surface is not a plane; a reflector plate; and a plurality of light sources arranged between the light guide plate and the reflector plate, wherein the light guide plate is provided with a plurality of grooves, each light source is arranged corresponding to one groove, and the light rays emitted by the light sources are reflected by the reflector plate, enter the light guide plate through the light incident surface and then exit the light guide plate through the light exit surface.

Description

Direct type backlight module

Technical field

The present invention relates to a kind of backlight module that is applied to display, particularly relate to actinomorphic direct type backlight module.

Background technology

Figure 1A is a kind of stereographic map of direct type backlight module of available liquid crystal display.Shown in Figure 1A, existing direct type backlight module 10 comprises a light guide plate (light guideplate) 11, one reflector plate (reflector) 12 and a plurality of fluorescent tube 13; Wherein, a plurality of fluorescent tubes 13 are arranged between reflector plate 12 and the light guide plate 11.

Generally speaking, with the bee-line place of fluorescent tube, be easy to generate maximum luminousing brightness on the light guide plate plane.Further, along with the permutations of a plurality of fluorescent tubes, produce luminosity easily and change on the luminous flat of the contiguous liquid crystal panel of light guide plate, just the striped of light and shade changes.

For the striped that improves above-mentioned light and shade changes, with reference to Figure 1B, it shows a kind of sectional view of direct type backlight module 20 of available liquid crystal display.On the exiting surface 25 of light guide plate 21 contiguous liquid crystal panels, form a light shield layer 24, cover the bright striped of light and shade striped by this light shield layer with fluorescent tube 23 corresponding sections.Yet the method will reduce the light amount by liquid crystal panel; Further, reduce the luminance brightness of LCD.In addition, again with reference to figure 1C, according to United States Patent (USP) 6,407, No. 781, it shows the sectional view of the direct type backlight module 30 of another kind of available liquid crystal display.Form V-type with the reflector plate 32 of fluorescent tube 33 corresponding positions, by the light beam of V-type reflector plate 32 reflections, so that reduce the difference of light and shade striped on the light guide plate 31 from fluorescent tube.Yet the light beam of direct irradiation light guide plate still can not produce the light and shade striped on the exiting surface 35 of the contiguous liquid crystal panel of light guide plate by the reflection of V-type reflex housing.

Summary of the invention

The object of the present invention is to provide a kind of direct type backlight module, to solve the above-mentioned problem that is proposed.

The object of the present invention is achieved like this, and a kind of direct type backlight module promptly is provided, and comprising: a light guide plate, have an incidence surface and an exiting surface, and above-mentioned exiting surface is positioned at above-mentioned incidence surface top, and above-mentioned incidence surface non-be the plane; One reflector plate; And a plurality of light sources, be arranged between above-mentioned light guide plate and the above-mentioned reflector plate, wherein, above-mentioned light guide plate is provided with a plurality of grooves, each light source corresponds to a groove setting, and above-mentioned these light sources emit beam, through above-mentioned reflector plate reflection, enter above-mentioned light guide plate by above-mentioned incidence surface, penetrate above-mentioned light guide plate by above-mentioned exiting surface again.

Wherein, the light guide plate that the present invention uses with on-plane surface incidence surface, its transversal section can be circular arc type, triangle, rectangle or polygon.

According to the present invention, by incidence surface is nonplanar light guide plate, will spread from the luminous flat of the contiguous liquid crystal panel of light guide plate equably from the light beam of fluorescent tube, and owing to have the light guide plate design of groove, make fluorescent tube can be embedded in the groove, can reduce backlight module thickness thus.

Description of drawings

Figure 1A is a kind of stereographic map of backlight module of available liquid crystal display;

Figure 1B is the sectional view of the backlight module of another kind of available liquid crystal display;

Fig. 1 C is the sectional view of the backlight module of another available liquid crystal display;

Fig. 2 is a first embodiment of the invention direct type backlight module cut-open view;

Fig. 3 is a second embodiment of the invention direct type backlight module cut-open view;

Fig. 4 is a third embodiment of the invention direct type backlight module cut-open view.

Embodiment

Please refer to Fig. 2, it is a first embodiment of the invention direct type backlight module cut-open view.In this embodiment, direct type backlight module 100 has a light guide plate 131, a reflector plate 132 and a plurality of light source 133, and wherein, light source 133 can be fluorescent tube.

Light guide plate 131 has an incidence surface 134 and an exiting surface 135, and exiting surface 135 is positioned at incidence surface 134 tops.Incidence surface 134 has the nonplanar structure of groove shape.Reflector plate 132 is in order to reflection ray.A plurality of light sources 133 are arranged between light guide plate 131 and the reflector plate 132; And a plurality of grooves 137 on the light guide plate 131 and the corresponding setting in light source 133 positions, each light source 133 places in the groove 137, can reduce the thickness of backlight module 100 integral body.

Light source 133 emits beam, and except entering via the incidence surface 134 with groove 137, directly penetrates outside the light guide plate 131, also can enter above-mentioned light guide plate 131 by incidence surface 134 through reflector plate 132 reflections, penetrates above-mentioned light guide plate 131 by above-mentioned exiting surface 135 again.

The transversal section of light guide plate 131 grooves 137 can be polygon as shown in Figure 2, and above light guide plate 131, also is provided with a disperser 136, uses so that the more even diffusion of light shafts.Disperser 136 can comprise that a screening glass is attached on the exiting surface 135, a prismatic lens is attached on the above-mentioned protective film and an atomizing piece is attached on the prismatic lens.

Please refer to Fig. 3, it is a second embodiment of the invention direct type backlight module cut-open view.In this embodiment, direct type backlight module 200 has a light guide plate 231, a reflector plate 232 and a plurality of light source 233, and wherein light source 233 can be fluorescent tube.

Light guide plate 231 has an incidence surface 234 and an exiting surface 235, and exiting surface 235 is positioned at incidence surface 234 tops.It is planar structure that incidence surface 234 has the non-of groove shape.Reflector plate 232 is in order to the reflected light wire harness.A plurality of light sources 233 are arranged between light guide plate 231 and the reflector plate 232; And a plurality of grooves 237 on the light guide plate 231 and the corresponding setting in light source 233 positions, each fluorescent tube 233 places in the groove 237, can reduce the thickness of backlight module 200 integral body.

Light source 233 emits beam, except entering via incidence surface 234 with groove 237, directly penetrate outside the light guide plate 231, also can be through reflector plate 232 reflections, enter this light guide plate 231 by incidence surface 234, penetrate above-mentioned light guide plate 231 by above-mentioned exiting surface 235 again.

In this embodiment, the transversal section of light guide plate 231 grooves 237 can be circular arc as shown in Figure 3.Above light guide plate 231; also be provided with a disperser 236; with so that the more even diffusion of light shafts, wherein disperser 236 can comprise that a screening glass is attached on the exiting surface 235, a prismatic lens is attached on the above-mentioned screening glass and an atomizing piece is attached on the above-mentioned prismatic lens.

Please refer to Fig. 4, it is a third embodiment of the invention direct type backlight module cut-open view.In this embodiment, direct type backlight module 300 has a light guide plate 331, a reflector plate 332 and a plurality of light source 333, and wherein light source 333 can be fluorescent tube.

Light guide plate 331 has an incidence surface 334 and an exiting surface 335, and exiting surface 335 is positioned at incidence surface 334 tops.What again, incidence surface 334 had a groove shape non-ly is planar structure.Reflector plate 332 is in order to the reflected light wire harness.A plurality of light sources 333 are arranged between light guide plate 331 and the reflector plate 332; And a plurality of grooves 337 on the light guide plate 331 and the corresponding setting in light source 333 positions, each light source 333 places within the groove 337, can reduce the thickness of backlight module 300 integral body.

Light source 333 emits beam, except entering via incidence surface 334 with groove 337, directly penetrate outside the light guide plate 331, also can be through reflector plate 332 reflections, enter this light guide plate 331 by incidence surface 334, penetrate above-mentioned light guide plate 331 by above-mentioned exiting surface 335 again.

In this embodiment, the transversal section of light guide plate 331 grooves 337 can be triangle as shown in Figure 4.Above light guide plate 331, also be provided with a disperser 336, use so that the more even diffusion of light shafts.Disperser 336 can comprise that a screening glass is attached on the exiting surface 335, a prismatic lens is attached on the above-mentioned screening glass and an atomizing piece is attached on the above-mentioned prismatic lens.

Though disclosed the present invention in conjunction with above preferred embodiment; yet it is not to be defined in the present invention; anyly be familiar with this technician, can do some and change and retouching not breaking away from the spirit and scope of the present invention, so protection scope of the present invention should be be as the criterion that claim was defined.

Claims

1. A direct type backlight module, comprising:

A light guide plate has a light incident surface and a light exit surface, and the light exit surface is located above the light incident surface, and the light incident surface is not flat;

a reflector; and

A plurality of light sources are arranged between the light guide plate and the reflection sheet,

Wherein, the light guide plate is provided with a plurality of grooves, and each light source is arranged corresponding to a groove, and the light emitted by these light sources is reflected by the reflector, enters the light guide plate from the light incident surface, and then exits from the light exit surface. The light guide plate.

2. The direct type backlight module as claimed in claim 1, wherein a cross section of the groove is arc-shaped.

3. The direct type backlight module as claimed in claim 1, wherein the cross section of the groove is triangular.

4. The direct type backlight module as claimed in claim 1, wherein the cross section of the groove is rectangular.

5. The direct type backlight module as claimed in claim 1, wherein the groove has a polygonal cross section.

6. The direct type backlight module as claimed in claim 1, further comprising a diffusion device disposed above the light guide plate.

7. The direct-lit backlight module as claimed in claim 6, wherein the diffusing device comprises a protective sheet attached to the light-emitting surface, a prism sheet attached to the protective film, and an atomized sheet attached to the The prism sheet is on.

8. The direct type backlight module as claimed in claim 1, wherein each light source is a light tube.