CN201037888Y

CN201037888Y - High brightness area light source device

Info

Publication number: CN201037888Y
Application number: CNU2007201536115U
Authority: CN
Inventors: 蔡荣智; 张庆辉
Original assignee: Taiwan Nano Electro Optical Technology Co Ltd
Current assignee: Fuxiang Industrial Co., Ltd.
Priority date: 2007-05-21
Filing date: 2007-05-21
Publication date: 2008-03-19
Anticipated expiration: 2017-05-21

Abstract

The utility model provides a high brightness surface light source device. A light guide plate is provided with a glaring surface, the glaring surface is provided with diffusing points with different spacing in the form of slight fogging surface to form a light beam diffusing surface, the light guide plate is provided with an undersurface, the undersurface is provided with a plurality of diffusing networks, one side of the light guide plate is provided with a first light collecting plate, and the light collecting plate is provided with a plurality of micro-prism structures; a plurality of diffusing points arranged on the undersurface of the light guide plate matches with the diffusing points with different space on the surface of the light guide plate in the form of fogging surface so that shadow of a light beam reflection point can be counteracted, with uniform luminescence and improving of front illumination; moreover, light beam outgoing from the glaring surface can directly generate refraction through a plurality of micro-prism structures arranged on the first light collecting plate, therefore, directivity of outgoing light beam can be increased for one more time and front illumination can be further improved.

Description

The high brightness planar light source device

Technical field

The utility model is a kind of high brightness planar light source device, be meant especially a kind of make this backlight module towards low consumption electric power, in light weight, volume is thin and more effective raising front face brightness, can reduce manufacturing cost again.

Background technology

See also shown in Figure 1, for commonly using backlight modular structure, it comprises some light sources 1, one reflecting plate 2, one light guide plate 3, one diffuser plate a, one first light collecting plate 4, one second light collecting plate 5, one screening glass 6, one liquid crystal panel 7, it is special little for to utilize the effect of this diffuser plate a to make the beam distribution of ejaculation more even, so, with regard to mobile computer display or general tool liquid crystal panel 7 displays, it requires the visual angle is not very strict, and because the effect of this diffuser plate a, the non-constant of the directive property of outgoing beam, the mobile computer that need only watch from the front in the time of to major part or tool liquid crystal panel 7 displays, the service efficiency of light is not high, and continuing to pursue low consumption electric power, slim, measure light backlight module, because the influence of this diffuser plate a, not only make the light beam utilization rate low, the while must spend the considerable time again and money is done R﹠D work;

Therefore, how to provide a kind of make this backlight module towards low consumption electric power, in light weight, volume is thin and more effective raising front face brightness, can reduce manufacturing cost person again, is the place of the technical difficulties that this case utility model people institute desire solves.

The utility model content

The purpose of the utility model high brightness planar light source device is to provide a kind of height planar light source device, be meant especially a kind of make this backlight module towards low consumption electric power, in light weight, volume is thin and more effective raising front face brightness, can reduce manufacturing cost again.

The technical scheme of the utility model high brightness planar light source device is: its mainly this light guide plate be provided with an exiting surface, its surface of this exiting surface is provided with the different diffusion point of density spacing with slight cloudy surface, use and form a beam spread face, this light guide plate is provided with a bottom surface again, this bottom surface is provided with some diffusions site, this light guide plate one side is provided with one first light collecting plate again, and this first light collecting plate is provided with some micro-prism structures; And when light beam is met the set some diffusion point in the bottom surface of this light guide plate, destroy total reflection, cooperate its surface of this light guide plate with the different diffusion point of the set density spacing of cloudy surface, and then the shadow of counteracting beam reflection point, and reach uniformly light-emitting and improve positive purpose highly simultaneously, and the light beam via the exiting surface outgoing directly produces the refractive power effect via the set some micro-prism structures of this first light collecting plate, and reach the directivity that increases outgoing beam once more, and then improve the purpose of front face brightness again.

The beneficial effect of the utility model high brightness planar light source device is: 1, needn't install diffuser plate; 2, increase the utilization rate of light beam; 3, light source more can be uniformly distributed in the luminous zone; 4, front face brightness relatively improves; 5, low consumption electric power; 6, in light weight, volume approaches; 7, save manufacturing cost.

Description of drawings

Fig. 1 is the backlight modular structure synoptic diagram of commonly using;

Fig. 2 is a backlight modular structure synoptic diagram of the present utility model;

Fig. 3 is the diffusion point synoptic diagram of light guide plate exiting surface of the present utility model;

Fig. 4 is the synoptic diagram of wedge type plate for the light guide plate of another embodiment of the utility model;

Fig. 5 is another structural representation of backlight module of the present utility model.

[figure number explanation]

A... some light sources of diffuser plate 1...

10.. light source cover 2... reflecting plate

3... light guide plate 31.. exiting surface

311. diffusion point 32.. bottom surface

321. some diffusion point 4... collection one tabula rasa

41.. micro-prism structure 5... second light collecting plate

51.. micro-prism structure 6... screening glass

7... liquid crystal panel 8... diffusion sheet

81... diffusion point

Embodiment

See also shown in Figure 2ly, the invention provides a kind of high brightness planar light source device, it comprises some light sources 1, a reflecting plate 2, a light guide plate 3, one first light collecting plate 4, one second light collecting plate 5, a screening glass 6, a liquid crystal panel 7, it is characterized by:

In order to send light beam, these some light source 1 one sides are provided with light source cover 10 to these some light sources 1 (as: light emitting diode, bulb, cold-cathode tube or relation line light source etc.) again, and this light source cover 10 partly surrounds these some light sources 1;

This reflecting plate 2 is arranged in this light guide plate 3 belows, and it will be in this light guide plate 3 of reflected back that expose these light guide plate 3 bottom surfaces, and to improve the utilization rate of light beam;

This light guide plate 3 is ganoid rectangular panel blocks or wedge shape plate (as Fig. 4), this light guide plate 3 is provided with an exiting surface 31 again, these exiting surface 31 its surfaces cooperate the mode (as: etching of printing or non-printing with slight cloudy surface, electrotyping, ultraprecise processing etc.) be provided with diffusion point 311 (as Fig. 3), use and form a beam spread face, this light guide plate 3 is provided with a bottom surface 32 again, this bottom surface 32 is provided with some diffusions site 321,311 densitys are put in diffusion by this exiting surface 31, the diffusion dot pattern design (as: ring-type that varies in size, the rib shape, triangular shape etc.), cooperate set some diffusions site 321, bottom surface 32, and the angle during this light beam outgoing of may command and offset beam reflection point shadow simultaneously advances to reach the purpose that improves front face brightness;

This first light collecting plate 4 is located at a side of this light guide plate 3, again this first light collecting plate 4 its be provided with some micro-prism structures 41, by the refractive power and the optically focused effect of these some micro-prism structures 41, and with directivity that increases outgoing beam and the purpose that reaches the raising front face brightness simultaneously;

These second light collecting plate, 5 its sides with respect to this screening glass 6 are provided with some micro-prism structures 51, refractive power and optically focused effect by these some micro-prism structures 51, produce refractive power, reflection and refraction once more, and reach the directivity that increases outgoing beam once more, advance to reach and improve front face brightness again;

This screening glass 6 is arranged in a side of the set some micro-prism structures 51 of this second light collecting plate 5, and with protection liquid crystal panel 7;

This liquid crystal panel 7 is arranged in a side of this screening glass 6, and it is a display device;

Please consult Fig. 2 again; shown in 3; these light guide plate 3 belows are provided with a reflecting plate 2; one first light collecting plate 4 is directly installed in these light guide plate 3 tops again; one second light collecting plate 5 is installed in these first light collecting plate, 4 tops; these second light collecting plate, 5 tops install a screening glass 6; these screening glass 6 tops install a liquid crystal panel 7; its this light guide plate 3 is in the mode of end face irradiation; and make light beam enter this light guide plate 3; and assisting by this reflecting plate 2; the beam reflection that to expose from these light guide plate 3 bottom surfaces is returned in this light guide plate 3; and to increase the utilization rate of light beam; and some diffusion points 321 of these light guide plate 3 bottom surfaces 32; the set diffusion point 311 of exiting surface 31 its surperficial cloudy surfaces that cooperates this light guide plate 3; and then the shadow of counteracting beam reflection point; and reach uniformly light-emitting and improve the purpose of front face brightness simultaneously; and the light beam via exiting surface 31 outgoing directly produces the refractive power effect via these first light collecting plate, 4 set some micro-prism structures 41; see through the set some micro-prism structures 51 of this second light collecting plate 5 again again; and make light beam produce reflection once more; refraction; and reach the directivity that increases outgoing beam once more; and then improving the purpose of front face brightness again, visible the utility model has practicality and progressive.

Moreover, can further be provided with a diffusion sheet 8 on this first light collecting plate 4, one side of this diffusion sheet 8 then is provided with liquid crystal panel 7, as shown in Figure 5, and these diffusion sheet 8 one sides are provided with one or above diffusion point 81, and the diffusion point 81 that sees through diffusion sheet 8 gives the even and fine-tuning light source refraction angle with light source.

For making the utility model show its progressive and practicality more, now with commonly use that to do a comparative analysis as follows:

Commonly use disappearance: 1, because the directivity that the effect light beam of diffuser plate penetrates is poor; 2, front face brightness relatively reduces; 3, manufacturing cost is too high.

The utility model advantage: 1, needn't install diffuser plate; 2, increase the utilization rate of light beam; 3, Light source more can be uniformly distributed in the luminous zone; 4, front face brightness relatively improves; 5, low consumption electric power; 6, in light weight, volume is thin; 7, save manufacturing cost.

In sum, the utility model is under the previous technical pattern, for a kind of low power consumption Power, in light weight, volume is thin and the backlight modular structure of Effective Raise front face brightness more, it is in the city On the face and in the domestic related data from find no identical person at first utility model when no query, and It but can reach again the effect that institute's wish is promoted, and practicality is especially unquestionable, should get permission patent, Request your auditor and can know clearly and give careful examine, develop simultaneously and day grant quasi patent for praying.

Claims

1. high brightness planar light source device is characterized in that: comprise:

One some light sources, the one side is provided with light source cover;

One reflecting plate, it is located at this light guide plate below;

One light guide plate, it is provided with an exiting surface, and this exiting surface is provided with the diffusion point, and this light guide plate is provided with a bottom surface again, and this bottom surface is provided with some diffusions site;

One first light collecting plate, it is provided with some micro-prism structures.

2. high brightness planar light source device according to claim 1 is characterized in that these some light sources are light emitting diode, bulb or leonard's tube.

3. high brightness planar light source device according to claim 1 is characterized in that this light guide plate is ganoid rectangular panel blocks.

4. high brightness planar light source device according to claim 1 is characterized in that this light guide plate is ganoid wedge shape plate.

5. high brightness planar light source device according to claim 1 is characterized in that, can further be provided with one second light collecting plate on this first light collecting plate.

6. as high brightness planar light source device as described in the claim 5, it is characterized in that this second light collecting plate is provided with some micro-prism structures.

7. as high brightness planar light source device as described in the claim 5, it is characterized in that a side of some micro-prism structures that this second light collecting plate is set further is provided with a screening glass, a side of this screening glass then is provided with liquid crystal panel.

8. high brightness planar light source device according to claim 1 is characterized in that, this first light collecting plate top further is provided with a diffusion sheet, and a side of this diffusion sheet then is provided with liquid crystal panel.

9. as high brightness planar light source device as described in the claim 8, it is characterized in that this diffusion sheet one side is provided with one or above diffusion point.