CN2588411Y

CN2588411Y - Area source device

Info

Publication number: CN2588411Y
Application number: CN 02250578
Authority: CN
Inventors: 陈弥坚
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2002-12-20
Filing date: 2002-12-20
Publication date: 2003-11-26
Anticipated expiration: 2012-12-20

Abstract

The utility model relates to an area source device used for a liquid crystal display, which comprises a large-area light conducting plate, a reflecting plate and a plurality of light sources, wherein the large-area light conducting plate is formed by cutting an acryl plate, and comprises an exit face and a bottom surface. A plurality of grooves are formed on the bottom surface of the large-area light conducting plate through the processing of a shaping cutter and are used for containing the light sources. The light sources can use cold cathode fluorescent lamp tubes, and the reflecting plate is adhered on the bottom surface of the large-area light conducting plate. The structural design of the light conducting plate makes that the utility model can be applied in a large area with splicing, and the utility model has the advantages of good luminescence brilliance and good uniformity.

Description

Planar light source device

[technical field]

The utility model relates to a kind of planar light source device that is used for LCD.

[background technology]

Because the liquid crystal material itself in the panel of LCD does not have the characteristics of luminescence, therefore, for reaching display effect, a planar light source device is provided for the LCD panel, as module backlight, its function is to provide the area source that briliancy is abundant and be evenly distributed to panel of LCD.

Please refer to Fig. 1, is a kind of module backlight 1 of prior art, and this module 1 backlight mainly is made up of light source 11, light guide plate 12, reflecting plate 13, diffuser plate 14 and two prism plates 15.Wherein, the effect of this light guide plate 12 is the transmission direction of direct light line, thereby improves the briliancy and the homogeneity of panel of LCD.For improving the utilization ratio of light source 11, the side at light source 11 is provided with a lampshade 111 usually, is used for the light that light source 11 is sent all is reflected into this light guide plate 12.

Light guide plate 12 can be divided into plate shaped light guide plate and wedge shape light guide plate according to shape.Be to increase light extraction efficiency and homogeneity, the one side in light guide plate 12 is provided with V-shaped groove or configuration site usually, and the distance that dispose on light guide plate 12 of this V-shaped groove or site and big or small different designs can be arranged.

Along with panel of LCD is increasingly extensive in the application of large tracts of land display device, need provide corresponding large tracts of land module backlight to match.Prior art adopts two light guide plate of splicing to form large-area planar light source device as shown in Figure 2, and it is exposed in No. the 5th, 438,484, the United States Patent (USP) of bulletin on August 1 nineteen ninety-five.This planar light source device 2 mainly comprises light source 211,212 and light guide plate 221,222, and wherein, this light guide plate 221,222 is respectively equipped with the plane of incidence 241,242 and exit facet 251,252.Light guide plate 221 and the plane of incidence 241 opposing end faces (not indicating) and light guide plate 222 and the plane of incidence 242 opposing end faces (not indicating) splicing, and bind by transparent binder and to form larger area light guide plate 22, the end face that binds forms joint face 23, exit facet 251,252 forms a new exit facet 25, and light source 211,212 is separately positioned on the contiguous plane of incidence 241,242 places, light guide plate 22 both sides.Luminous by light source 211,212 during these planar light source device 2 work, light beam is injected light guide plate 22 by the plane of incidence 241,242 respectively, is penetrated by exit facet 25, forms the light source that the feed flow LCD panel uses.But, this light guide plate 22 is to be binded by the less light guide plate 221,222 of area to form, be subjected to transparent binder and and the influence of light source 211,212 distances, exit facet 25 is difficult to consistent near the bright dipping briliancy of joint face 23 parts and the bright dipping briliancy of the close plane of incidence 241,242 parts, make planar light source device 2 be difficult to have preferable optical property.In addition, this planar light source device 2 only is provided with light source 211,212 in light guide plate 22 both sides, and light guide plate 22 areas are big more, is difficult to more guarantee that its each several part has sufficiently high bright dipping briliancy.

[utility model content]

Lack good bright dipping briliancy and homogeneity for solving prior art large scale planar light source device, the utility model provides a kind of employing large tracts of land light guide plate and has good bright dipping briliancy and inhomogeneity planar light source device.

The technical scheme that the utility model technical solution problem adopts is: a planar light source device is provided, and it comprises a large tracts of land light guide plate and a plurality of light source.Wherein, this large tracts of land light guide plate comprises an exit facet and a bottom surface, on this large tracts of land bottom surface of light guide plate a plurality of grooves is set, and is used to take in this a plurality of light sources.

Compared with prior art, the utlity model has following advantage: this planar light source device adopts a large tracts of land light guide plate, this large tracts of land light guide plate is provided with structural design that a plurality of grooves are used to take in a plurality of light sources and it need not be spliced can realize large tracts of landization in the bottom surface, the quantity of adjustment light source and relative spacing can realize the control to briliancy, also make the bright dipping of large tracts of land light guide plate each several part even, dark line can not occur, adopt the planar light source device of this large tracts of land light guide plate to have good light source characteristic thereby make.

[description of drawings]

Fig. 1 is the decomposing schematic representation of prior art planar light source device;

Fig. 2 is the schematic perspective view of prior art large scale planar light source device;

Fig. 3 is the schematic perspective view of the utility model planar light source device first embodiment;

Fig. 4 is the schematic perspective view of the utility model planar light source device second embodiment.

[embodiment]

As shown in Figure 3, be first embodiment of the utility model planar light source device, this planar light source device 3 comprises a reflecting plate 33, a light guide plate 32 and a plurality of light source 31, wherein, this light guide plate 32 is by the acrylic plate excision forming.

This light guide plate 32 is six entities of a tabular, and it comprises a bottom surface 35 and an exiting surface 37, and wherein, this exiting surface 37 be arranged in parallel with this bottom surface 35.Use forming tool to process a plurality of grooves 34 at this bottom surface of light guide plate 35, be used to take in a plurality of light sources 31.These a plurality of grooves 34 are arranged in parallel the distance that its space is certain.This light source 31 can be used the cold cathode fluorescent lamp pipe, and the concave surface of groove 34 is a light beam incidence surface 36.According to the requirement of homogeneity and bright dipping briliancy, the diffusion site (figure does not show) of the different designs of can arranging in the exiting surface 37 of this light guide plate 32 and bottom surface 35.In the present embodiment, the thickness of light guide plate 32 can be 6mm to 10mm, adopt diameter be the cold cathode fluorescent lamp pipe of 2mm to 2.4mm as light source 31, during machined grooves 34, its internal diameter is controlled at 3mm to 3.4mm can be installed in the cold cathode fluorescent lamp pipe in the groove 34 non-contactly.This reflecting plate 33 is attached at the bottom surface 35 of this light guide plate 32, and the surface that itself and light guide plate 32 bottom surfaces 35 attach is placed with diffusion site (figure does not show), is used for further spreading light beam.During use, light source 31 is luminous, and light beam is injected in the light guide plate 32 by incidence surface 36, and the diffusion site of bottom surface 35 and reflecting plate 33 can be derived light beam this light guide plate 32, and the diffusion site on the exiting surface 37 can further improve the homogeneity of outgoing beam.Realize the light guide plate 32 of large tracts of landization, only need on acrylic plate, according to bright dipping briliancy and inhomogeneity requirement the light source 31 that quantity and spacing can be adjusted arbitrarily is installed again by required area excision forming.Improve briliancy and homogeneity, only need increase the spacing that light source 31 quantity are adjusted light source 31 simultaneously.The quantity and spacing of control groove 34 can realize adjusting arbitrarily the quantity and spacing of light source 31.The exiting surface 37 of light guide plate 32 will be different thereupon also with the design of the diffusion site of bottom surface 35, thereby the exiting surface 37 that guarantees large tracts of land light guide plate 32 each part all has good bright dipping briliancy and homogeneity.

Please refer to Fig. 4, is the utility model planar light source device second embodiment, and it is the improvement on the first embodiment basis.Planar light source device 4 comprises a reflecting plate 43, a light guide plate 42, a plurality of cold cathode fluorescent lamp pipe 41, two stands 45 and plural lasso 46.Wherein, this lasso 46 can be made by the transparency and heat-proof material, as silicon rubber (Silicon Rubber), it is arranged in the groove 44 and is nested on the cold cathode fluorescent lamp pipe 41, but fixing is located this cold cathode fluorescent lamp pipe 41, also forms at interval, avoids cold cathode fluorescent lamp pipe 41 to contact with light guide plate 42.This two stands 45 can be made by silicon rubber, and nested a plurality of cold cathode fluorescent lamp pipes 41 two ends also are used for the fixing location respectively.On these two stands 45 levels and vertical direction, all be provided with a plurality of through holes that are used to dispel the heat 47.

Claims

1. planar light source device, it comprises a large tracts of land light guide plate and a plurality of light source, wherein this large tracts of land light guide plate comprises an exit facet and a bottom surface, it is characterized in that: on this large tracts of land bottom surface of light guide plate a plurality of grooves are set, are used to take in this a plurality of light sources.

2. planar light source device according to claim 1 is characterized in that this planar light source device further comprises a reflecting plate, and it is attached at this bottom surface of light guide plate.

3. planar light source device according to claim 2 is characterized in that the surface that this reflecting plate is attached at this large tracts of land light guide plate is placed with the diffusion site.

4. planar light source device according to claim 1 is characterized in that the bottom surface between between groove is placed with the diffusion site on this light guide plate.

5. planar light source device according to claim 1 is characterized in that the exiting surface of this light guide plate is placed with the diffusion site.

6. planar light source device according to claim 1, the groove that it is characterized in that this bottom surface of light guide plate is to be arranged in parallel, and the space certain distance.

7. planar light source device according to claim 1, further feature are that this light source can be cathode fluorescent tube.

8. planar light source device according to claim 7 is characterized in that this light supply apparatus comprises a plurality of lassos, and these a plurality of lassos are arranged in this groove and nested this cold cathode fluorescent lamp pipe.

9. planar light source device according to claim 7 is characterized in that this planar light source device comprises two stands, and these cold cathode fluorescent lamp pipe two ends of support difference fixing.

10. planar light source device according to claim 9 is characterized in that all being provided with through hole in level and vertical direction on this two stands.