CN201083931Y

CN201083931Y - Backlight module

Info

Publication number: CN201083931Y
Application number: CNU2007201785423U
Authority: CN
Inventors: 蔡荣智; 张庆辉; 曾国柱
Original assignee: Taiwan Nano Electro Optical Technology Co Ltd
Current assignee: Fuxiang Industrial Co., Ltd.
Priority date: 2007-09-18
Filing date: 2007-09-18
Publication date: 2008-07-09
Anticipated expiration: 2017-09-18

Abstract

The utility model relates to a backlight module, which is characterized in that: a plurality of prism structures, being rotated at an angle, are arranged on prism sheets. When applied in the backlight module, the prism sheets are arranged on a light exit surface of a light guide plate, and optical structures arranged in X and Y directions are positioned on a bottom surface and the light exit surface of the light guide plate, enabling the light to be emitted by the light guide plate and the prism sheets without creating any interference phenomenon (MOIRE).

Description

Backlight module

Technical field

The utility model provides a kind of prismatic lens and applied backlight module thereof, aims to provide a kind of prism Sheet structure, when it is applied in the backlight module, can prevent prismatic lens and applied backlight module thereof that interference (MOIRE) produces.

Background technology

The plane shows that science and technology is widely used in television indicator, graphoscope, and palm type electronic articles for use (as: mobile phone, PDA(Personal Digital Assistant), etc.), LCD (LCD) is flat-panel screens a kind of kenel wherein, and it is implanted one and has liquid crystal (LC) module of array of pixels to show image.In backlight LCD, brightness enhancing films uses the structure guiding light of prism along sight line axle (annotating: vertical with display), with of the brightness of enhancing display, thereby can make this system produce the upward illumination of needed axle with less energy by the light that the user was seen.Up to the present, brightness enhancing films is by being supplied with at the lip-deep parallel prism ditch of the light emission of film, lensing ditch or Pyramid ditch, in order to change the angle of film and air interface, make light can excite film, and make the oblique surface that is incident on other film of light energy to redistribute, make that more rays can be perpendicular to the light gasing surface of glued membrane.Brightness enhancing films has level and smooth light entrance face, through face thus light is entered by backlight module.So far, two brightness enhancing films layers that rotate are mutually used in many application, and therefore the groove at separately thin layer is to differ an angle of 90 degrees each other.When using two brightness enhancing films of flat-panel screens, may produce and not wish the interference (MOIRE) that occurs, this interference is caused by two periodic prism mode configurations on the surface of two brightness enhancing films.

As shown in Figure 1, traditional backlight module 1 comprises light source 10 at present, light guide plate 12, several pieces of blooming pieces and liquid crystal panel 14, wherein, this light guide plate 12 is directly last, the lower face construction has the optical texture 121 that is continuous sawtooth channel form, it is located on the light guide plate 12, the optical texture 121 of lower face becomes X respectively, the Y direction is arranged, for example be located at 121 one-tenth homeotropic alignments of optical texture of upper face, the optical texture 121 of lower face then forms horizontally, allow light source 10 incidents directly advance light through light guide plate 12 convert to vertical plane light after, optical texture 121 through light guide plate 12 plate faces makes light at X again, Y direction light harvesting is also adjusted the divergence of beam angle, and the effect that has optically focused and add lustre to.

And several pieces of set blooming pieces of light guide plate 12 tops can be diffusion sheet 13 and first and second

prismatic lens

15,16, wherein this first and second

prismatic lens

15,16 is provided with plural prism structure 151,161, the plural prism structure 151 of this first prismatic lens 15 is homeotropic alignment, and the plural prism structure 161 of second prismatic lens 16 is horizontal; Yet horizontal plural prism structure 161 makes light guide plate 12 and liquid crystal panel 14 produce interference (MOIRE) easily on this second prismatic lens 16, and the image that makes whole display effect have folded line takes place.

The utility model content

Fundamental purpose of the present utility model is to provide a kind of backlight module that prevents that interference (MOIRE) from producing.

In view of this, prismatic lens of the present utility model is provided with plural prism structure, and each prism structure rotates an angle, when this prismatic lens is applied in the backlight module, this prismatic lens is located on the exiting surface of light guide plate, and the bottom surface of this light guide plate and exiting surface are provided with into the optical texture of X, the arrangement of Y direction.

The beneficial effects of the utility model are: light is penetrated via light guide plate and prismatic lens, can not produce interference (MOIRE).

Description of drawings

Fig. 1 is for practising the structural perspective that backlight module is arranged;

Fig. 2 is the structural perspective of prismatic lens in the utility model;

Fig. 3 is the structural representation of prismatic lens in the utility model;

Fig. 4 is the part structure for amplifying synoptic diagram of prismatic lens in the utility model;

Fig. 5 is applied to the structural perspective of backlight module first embodiment for prismatic lens in the utility model;

Fig. 6 is applied to the structural perspective of backlight module second embodiment for prismatic lens in the utility model.

[figure number explanation]

Backlight module 1 light source 10

Light guide plate 12 optical textures 121

Diffusion sheet 13 liquid crystal panels 14

First prismatic lens, 15 prism structures 151

Second prismatic lens, 16 prism structures 161

Prismatic lens 2 first avris 21

Second avris, 22 prism structures 23

Light guide plate 3 light faces 31

Bottom surface 32 exiting surfaces 33

Optical texture 34 light sources 4

Embodiment

Your auditor is convenient to understand content of the present utility model in order to make, and the effect that can reach, cooperates the graphic specific embodiment of enumerating now, and introduction is described as follows in detail:

The utility model backlight module, the basic structure of this prismatic lens 2 is formed as shown in Figures 2 and 3, this prismatic lens 2 has corresponding in twos first,

second avris

21,22, this prismatic lens 2 is provided with plural prism structure 23, each prism structure 23 rotations one angle, make part prism structure 23 extend to second avris 22 by first avris 21, this prismatic lens 2 is upper left part and bottom right prism structure 23 partly in Fig. 3, and part prism structure 23 extends to relative first avris 21 in addition by first avris 21, and this prism structure 23 and first,

second avris

21,23 angle is not equal to 90 degree, in the present embodiment, the anglec of rotation of this prism structure 23 is about 3～15 degree, as shown in Figure 4, make the angle theta of this prism structure 23 and second avris 23 be about 3～15 degree.

When this prismatic lens 2 is applied in the backlight module, as shown in Figure 5, this backlight module includes at least: light guide plate 3, plural number light source 4 and at least one prismatic lens 2, wherein, this light guide plate 3 has an incidence surface 31, one bottom surface 32 of intersecting with this incidence surface 31, an and exiting surface 33 relative with this bottom surface 32, this bottom surface 32 and exiting surface 33 construction have the optical texture 34 of plural channel form, the optical texture of this bottom surface 32 and exiting surface 33 becomes X respectively, the Y direction is arranged, among the embodiment as shown in the figure, the optical texture 34 of this bottom surface of light guide plate 32 is towards being arranged in parallel, and the optical texture 34 of this light guide plate exiting surface 33 is towards homeotropic alignment, and plural light source 4 is arranged at a side that should light guide plate incidence surface 31, and this light source 4 can be pointolite or line source (as shown in Figure 6).

Wherein, the prism structure of this prismatic lens rotates an angle with the optical texture orientation of bottom surface of light guide plate, the prism structure of this prismatic lens and the optical texture of bottom surface of light guide plate form the angle of about 3～15 degree, during concrete enforcement, as shown in the figure, second avris 22 of this prismatic lens 2 is parallel with light guide plate incidence surface 31, and this second avris 22 is parallel with the optical texture 34 of bottom surface of light guide plate 32, and the angle of this prism structure 23 and second avris 22 is about 3～15 degree.

Perhaps, the prism structure of this prismatic lens rotates an angle with the optical texture orientation of light guide plate exiting surface, the optical texture of the prism structure of this prismatic lens and light guide plate exiting surface forms the angle of about 3～15 degree, during concrete enforcement, as shown in Figure 6, second avris 22 of this prismatic lens 2 is vertical with light guide plate incidence surface 31, and this second avris 22 is parallel with the optical texture 34 of light guide plate exiting surface 33, and the angle of this prism structure 23 and second avris 22 is about 3～15 degree.

In the various embodiments described above, prism structure on the prismatic lens rotates an angle, make this prism structure not with light guide plate wherein the one side optical texture be arranged in parallel fully, when the light that makes light source penetrates via light guide plate, prismatic lens and liquid crystal panel, can prevent interference (MOIRE) generation of light guide plate and liquid crystal panel.

As mentioned above, the utility model provides another preferable feasible backlight module, and the application of novel patent is offered in the whence in accordance with the law; Only, above implementation and graphic shown in, be the utility model preferred embodiment person, be not to limit to the utility model with this, be with, approximate with structure of the present utility model, device, feature etc. such as, identical person all should belong to of the present utility model founding within purpose and the claim.

Claims

1. backlight module is characterized in that it includes at least:

Light guide plate, this light guide plate has an incidence surface, one and this incidence surface bottom surface of intersecting, and an exiting surface relative with this bottom surface, this bottom surface and exiting surface construction have the optical texture of plural channel form, and the optical texture of this bottom surface and exiting surface becomes X, Y direction to arrange respectively;

Light source is arranged at a side that should the light guide plate incidence surface;

At least one prismatic lens, this prismatic lens is located on the exiting surface of light guide plate, and this prismatic lens is provided with plural prism structure, each prism structure rotates an angle.

2. backlight module according to claim 1 is characterized in that, the optical texture of this bottom surface of light guide plate is towards being arranged in parallel, and the optical texture of this light guide plate exiting surface is towards homeotropic alignment.

3. as backlight module as described in the claim 2, it is characterized in that the prism structure of this prismatic lens rotates an angle with the optical texture orientation of bottom surface of light guide plate.

4. as backlight module as described in the claim 2, it is characterized in that the prism structure of this prismatic lens and the optical texture of bottom surface of light guide plate form the angles of 3～15 degree.

5. as backlight module as described in the claim 2, it is characterized in that the prism structure of this prismatic lens rotates an angle with the optical texture orientation of light guide plate exiting surface.

6. as backlight module as described in the claim 2, it is characterized in that the optical texture of the prism structure of this prismatic lens and light guide plate exiting surface forms the angles of 3～15 degree.

7. backlight module according to claim 1, it is characterized in that, this prismatic lens has corresponding in twos first, second avris, this prismatic lens is provided with plural prism structure, wherein the part prism structure extends to second avris by first avris, and the part prism structure extends to relative first avris in addition by first avris, and the angle of this prism structure and first, second avris is not equal to 90 degree.

8. as backlight module as described in the claim 7, it is characterized in that this second avris is parallel with the light guide plate incidence surface, and this second avris is parallel with the optical texture of bottom surface of light guide plate.

9. as backlight module as described in the claim 7, it is characterized in that this second avris is vertical with the light guide plate incidence surface, and this second avris is parallel with the optical texture of light guide plate exiting surface.

10. as backlight module as described in claim 8 or 9, it is characterized in that the angle of this prism structure and second avris is 3～15 degree.