CN2580452Y

CN2580452Y - Large size light conduction plate

Info

Publication number: CN2580452Y
Application number: CN02249477U
Authority: CN
Inventors: 刘铭萱
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: 2002-11-08
Filing date: 2002-11-08
Publication date: 2003-10-15
Anticipated expiration: 2012-11-08

Abstract

The utility model relates to a large size light conduction plate for backlight systems of liquid-crystal displays, which is formed by that two light conducting elements with moderate and small sizes are arranged in a parallel mode. The light conducting elements respectively comprises a light incidence surface, a light outgoing surface, an end surface, a bevel surface and a bottom surface, which are orderly connected together to form a tabular entity, wherein, the bevel surface slopes corresponding to the end surface. The two light conducting element are connected together by the end surface and are arranged in a parallel mode to form the light conduction plate with large size. The structure design of the light conduction plate with large size can eliminate the dark streak of the junction of the light outgoing surface, and accordingly, the uniformity of the outgoing light of the integral light outgoing surface of the light conducting plate can be increased.

Description

Large-size light-conducting plate

[technical field]

The utility model is the large-size light-conducting plate that is used for the LCD backlight system about a kind of.

[background technology]

Because the liquid crystal itself in the panel of LCD is not had a characteristics of luminescence, thereby, for reaching display effect, need to give the LCD panel that one planar light source device is provided, as back light system, its function is to panel supply briliancy fully and the area source that is evenly distributed.

The back light system of prior art as shown in Figure 1, this back light system 1 mainly is made up of light source 11, light guide plate 12, reflecting plate 13, diffuser plate 14 and digonous runner plate 15.Wherein, the effect of this light guide plate 12 is the transmission direction of direct light line, and then improves the briliancy and the homogeneity of panel of LCD.For improving the utilization ratio of light source 11, in light source 11 1 sides one lampshade 111 is set usually, all be reflected into this light guide plate 12 with the light that light source 11 is sent.

According to the shape of light guide plate 12, it can be divided into plate shaped light guide plate and wedge shape light guide plate again.In addition, for increasing 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 this V-shaped groove or site dispose on light guide plate 12 all can have different designs with size.

Along with panel of LCD large scale information equipment use increasingly extensive, corresponding need provide large-sized back light system to match.The large scale back light system of prior art as shown in Figure 2, it is exposed in No. the 5th, 420,761, the United States Patent (USP) of May 30 nineteen ninety-five bulletin.This large scale back light system comprises a large-size light-conducting plate 21, reflecting

plate

29 and 34, diffuser plate 32 and a light source (figure does not show).Wherein, this large-size light-conducting plate 21 comprises an incidence surface 22, end face 23, exiting surface 26 and lower surface 27, and this lower surface 27 is provided with a plurality of V-shaped grooves 271.The light 35 that this light source sends and reflexes to exiting surface 26 through lower surface 27 and penetrates in incidence surface 22 is incident to this large-size light-conducting plate 21.Reflecting plate 34 is affixed on end face 23 and all is reflected into this large-size light-conducting plate 21 with the light that will throw thereon, and then is penetrated by exiting surface 26.

This large-size light-conducting plate 21 mainly is to make by ejection formation, and still, the size of these light guide plate 21 is bigger, and its ejection formation more is difficulty.Also easily produce problems such as flow liner and burr often because of uneven flexible, the distortion of product stress distribution, and with respect to the end of injection port, cause the yield decline of product.Simultaneously, the equipment of exploitation large scale ejection formation also needs higher cost.

In addition, because these light guide plate 21 sizes are bigger, when light source only was arranged at incidence surface 22 1 sides of light guide plate 21, far away apart from light source because of end face 23, the briliancy of the light guide plate part of close end face 23 was difficult to consistent near the briliancy of incidence surface 22 light guide plate part.Even light source 35 all is set in light guide plate 21 both sides, the lower dark line of briliancy still can appear at the center section of light guide plate 21, be difficult to reach better optical characteristics.

[utility model content]

The technical matters that the utility model solves is to provide a kind of large-size light-conducting plate, improves the light-emitting uniformity of the whole exiting surface of light guide plate simultaneously.

For realizing the utility model purpose, the utility model large-size light-conducting plate forms by being set up in parallel two light-guide devices.This two light-guide device comprises respectively that the incidence surface of accepting light, intersects with incidence surface and exiting surface that light is derived, one with incidence surface is relative and with crossing end face, the inclined-plane of exiting surface, this inclined-plane and this end face is adjacent and with respect to this end slope, the end face of this two light guide plate interconnects and by the interaction of inclined-plane to light, eliminate the dark line of junction exiting surface, and then improve the leaded light efficient and the homogeneity of light guide plate.This inclined-plane can be coated with reflecting material or attach reflector plate.

Compared to prior art, the utlity model has following advantage: because of the utility model adopts in two, the small size light-guide device is merged into large-size light-conducting plate, it is difficult for producing owing to uneven bending, the distortion that causes of stress distribution, and then influence the defective of light guide plate yield and optical property, thereby the equipment that can avoid simultaneously developing the large scale ejection formation reduces manufacturing cost; In addition, the utility model adopts the inclined design of light-guide device, also can improve the optical characteristics of light guide plate, increases the leaded light homogeneity.

[description of drawings]

Fig. 1 is the decomposing schematic representation of prior art back light system;

Fig. 2 is the schematic perspective view of prior art large scale back light system;

Fig. 3 is the schematic perspective view of the utility model large-size light-conducting plate;

Fig. 4 is the side schematic view of another embodiment of the utility model large-size light-conducting plate;

Fig. 5 is the utility model large-size light-conducting plate and the synoptic diagram that cooperates of light source.

[embodiment]

As shown in Figure 3, be the schematic perspective view of the utility model large-size light-conducting plate 50.This large-size light-conducting plate 50 comprises two light-guide devices that are set up in parallel 51, and this two light-guide device 51 can adopt transparent material and make with the mode or the alternate manner of ejection formation.

Each light-guide device 51 comprises an incidence surface 511, an exiting surface 513, an end face 515, an inclined-plane 519 and a bottom surface 517 respectively, and these five planes link to each other in turn and constitute a tabular entity.Wherein, this incidence surface 511 and end face 515 are relative and be parallel to each other, and exiting surface 513 and bottom surface 517 are relative and be parallel to each other.Wherein, this incidence surface 511 is in order to the light of acceptance from light source (scheming not show), and it is imported in light-guide device 51.A plurality of parallel vee-cuts (figure does not show) of site that ranks arrange or a plurality of and incidence surface 511 that are can be arranged in bottom surface 517, and it all is in order to exiting surface 513 that light is evenly led, and improves briliancy.This exiting surface 513 is in order to derive light this light-guide device 51.The end face 515 of this two light-guide device 51 connects by transparent materials of adhesive, can reach large-size light-conducting plate 50.The inclined-plane 519 of this two light-guide device 51 respectively posts reflector plate 53.

Fig. 4 is the large-size light-conducting plate 60 of another embodiment of the utility model, and it comprises two and the light-guide device 61 put.Each light-guide device 61 comprises an incidence surface 611, an exiting surface 613, an end face 615 and an inclined-plane 519 respectively, and these four planes link to each other in turn and constitute a clapboard.Wherein, this incidence surface 611 is parallel to each other with end face 615, and the inclined-plane 619 of this two light-guide device 61 posts reflector plate 63 respectively.

Again as shown in Figure 5, be the utility model large-size light-conducting plate 50 and the synoptic diagram that cooperates of light source.In the present embodiment, this light source is two fluorescent tubes 55 that are equal to these large-size light-conducting plate 50 incidence surfaces 511 width, and this two fluorescent tube 55 be arranged in parallel with the incidence surface 511 of this two light-guide device 51 respectively.This two fluorescent tube 55 to around emit beam, wherein relative with incidence surface 511 part light is directly into being incident upon light-guide device 51, for increasing the light source utilization ratio, can be respectively this two fluorescent tube 55 away from light-guide device 51 sides two lampshades 551 are set, be reflected into this light-guide device 51 with other light that this fluorescent tube 55 is sent via this lampshade 551.In addition, the incidence surface 511 of this two light-guide device 51 also can be provided with two fluorescent tubes 55 respectively as light source.

Certainly, for preventing bottom surface 517 outgoing of light, also can reflecting plate be set, will be reflected into this large-size light-conducting plate 50 once more by the light of bottom surface 517 outgoing in the bottom surface 517 of relative this large-size light-conducting plate 50 by this large-size light-conducting plate 50.Also can set gradually diffuser plate and prism plate at the relative exiting surface 513 of this large-size light-conducting plate 50, so that by the distribution of light of exiting surface 513 outgoing uniformity more.

Because the inclined-plane 519 of the utility model large-size light-conducting plate 50 tilts with respect to end face 515, after the light 553 that sends via a side lamp pipe 55 is incident to inclined-plane 519, reflex to the exiting surface 513 of opposite side light-guide device 51 by this inclined-plane 519, interaction by these 519 pairs of light 553 in two light-guide devices, 51 inclined-planes, the emergent ray 553 of its two exiting surface 513 is contained mutually, and then eliminates the dark line of linkage interface.

The reflection of these 519 pairs of light in inclined-plane can be reached by attaching reflector plate 53, also can realize at these inclined-plane 519 coating reflecting materials.In addition, for guaranteeing can to pass end face 515 via the light of inclined-plane 519 reflections, this inclined-plane 519 is required to be 135 degree at least with the angle of bottom surface 517, and this two fluorescent tube 55 also should be lower than end face 515 and be provided with.

Claims

1. large-size light-conducting plate, it is characterized in that: it comprises two light-guide devices that are set up in parallel, this two light-guide device comprises respectively that the incidence surface of accepting light, intersects with incidence surface and exiting surface that light is derived, one with incidence surface is relative and with crossing end face, the inclined-plane of exiting surface, this inclined-plane and this end face is adjacent and with respect to this end slope, the end face of this two light guide plate interconnects.

2. large-size light-conducting plate according to claim 1 is characterized in that: this light-guide device further comprise one intersect with the inclined-plane and with the exiting surface opposed bottom surface, this incidence surface, exiting surface, end face, inclined-plane and bottom surface link to each other in turn and constitute a tabular entity.

3. large-size light-conducting plate according to claim 1 is characterized in that: the incidence surface of this light-guide device, exiting surface, end face and inclined-plane link to each other in turn and constitute a clapboard.

4. according to claim 2 or 3 described large-size light-conducting plate, it is characterized in that: the end face of this two light-guide device is to interconnect by transparent materials of adhesive.

5. large-size light-conducting plate according to claim 2 is characterized in that: the angle of this inclined-plane and bottom surface is at least 135 degree.

6. according to claim 2 or 3 described large-size light-conducting plate, it is characterized in that: this inclined-plane is coated with reflecting material.

7. according to claim 2 or 3 described large-size light-conducting plate, it is characterized in that: it further comprises a reflector plate, and this reflector plate is attached on this inclined-plane.

8. large-size light-conducting plate according to claim 2 is characterized in that: this bottom surface and this exiting surface are to be arranged in parallel.

9. large-size light-conducting plate according to claim 2 is characterized in that: this bottom surface is provided with a plurality of V-grooves, and this V-groove is parallel with this incidence surface.

10. large-size light-conducting plate according to claim 2 is characterized in that: a plurality of sites of arranging, this bottom surface, this site become ranks to arrange.