CN2580476Y - Surface light source device - Google Patents
Surface light source device Download PDFInfo
- Publication number
- CN2580476Y CN2580476Y CN 02249711 CN02249711U CN2580476Y CN 2580476 Y CN2580476 Y CN 2580476Y CN 02249711 CN02249711 CN 02249711 CN 02249711 U CN02249711 U CN 02249711U CN 2580476 Y CN2580476 Y CN 2580476Y
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- Prior art keywords
- light
- light source
- guide device
- source device
- plane
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- Expired - Lifetime
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The utility model relates to a surface light source device for liquid-crystal displays. The surface light source device comprises a large size light conducting plate and at least two lamp tubes, wherein, the large size light conducting plate is formed by that two moderate size and small size light conducting elements 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 connected orderly to form a tabular entity; the bevel surface slopes corresponding to the end surface. The structure design of the large size light conduction plate can eliminate the dark streak of the junction of the light outgoing surface, and accordingly, the uniformity of the outgoing light of the overall surface light source device is increased.
Description
[technical field]
The utility model is the planar light source device that is used for LCD 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 planar light source device of prior art as shown in Figure 1, this planar light source device 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 planar light source device to match.The large scale planar light source device 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 planar light source device 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, and improve whole planar light source device and also be difficult to reach better optical characteristics.
[utility model content]
The technical matters that the utility model solves is to provide a kind of planar light source device, and this planar light source device adopts a large-size light-conducting plate and the higher light-emitting uniformity of tool.
For realizing the utility model purpose, the utility model planar light source device comprises a large-size light-conducting plate and at least two fluorescent tubes, and wherein, this large-size light-conducting plate is to form 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.This at least two fluorescent tube is arranged at two incidence surface places of this large-size light-conducting plate respectively, and for further increasing light utilization ratio and light-emitting uniformity, also the exiting surface of this planar light source device sets gradually diffuser plate and prism plate relatively.
Compared to prior art, the utlity model has following advantage: adopt the large-size light-conducting plate that is merged into by two light-guide devices because of the utility model, this large-size light-conducting plate is difficult for producing owing to uneven bending, the distortion that causes of stress distribution, and need not to develop the equipment of large scale ejection formation, thereby preferable optical property and the low manufacturing cost of tool; In addition, the inclined design of this light-guide device also can improve the leaded light homogeneity of light guide plate and whole planar light source device.
[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 large-size light-conducting plate of the utility model planar light source device employing;
Fig. 4 is the side schematic view of another embodiment of large-size light-conducting plate of the utility model planar light source device employing;
Fig. 5 is the side schematic view of the utility model planar light source device.
[embodiment]
As shown in Figure 3, be the schematic perspective view of the large-size light-conducting plate 50 of the utility model planar light source device employing.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 ejection formation or other modes.
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 planar light source device employing, and it comprises two juxtaposed light-guide devices 61.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 side schematic view of the utility model planar light source device, it is cooperated with light source by this large-size light-conducting plate 50 and constitutes.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.
Because the inclined-plane 519 of the large-size light-conducting plate 50 that the utility model planar light source device adopts 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.
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 light by exiting surface 513 outgoing after, through the effect of diffuser plate and prism plate, further improve this planar light source device outgoing uniformity more that distributes.
The utility model planar light source device equally can be shown in Figure 4 large-size light-conducting plate 60 cooperate formation with light source.
Claims (13)
1. planar light source device, it comprises a large-size light-conducting plate and at least two fluorescent tubes, it is characterized in that: this large-size light-conducting plate comprises two light-guide devices, this two light-guide device comprise respectively one accept that incidence surface, from the light of fluorescent tube intersects with incidence surface and exiting surface that light is derived, one and 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 device interconnects, and this at least two fluorescent tube is arranged at the incidence surface place of this two light-guide device respectively.
2. planar light source device according to claim 1 is characterized in that: this light-guide device further comprise one intersect with the inclined-plane and with exiting surface opposed bottom surface, this incidence surface, exiting surface, end face, inclined-plane and the bottom surface formation one tabular entity that links to each other in turn.
3. planar light source device according to claim 1 is characterized in that: the incidence surface of this light-guide device, exiting surface, end face link to each other in turn with the inclined-plane and constitute a clapboard.
4. according to claim 2 or 3 described planar light source devices, it is characterized in that: the end face of this two light-guide device interconnects by transparent glutinous agent material.
5. planar light source device according to claim 2 is characterized in that: the inclined-plane of this two light-guide device and the angle of bottom surface are at least 135 degree.
6. according to claim 2 or 3 described planar light source devices, it is characterized in that: the inclined-plane of this two light-guide device is coated with reflecting material.
7. according to claim 2 or 3 described planar light source devices, it is characterized in that: this two light-guide device further comprises a reflector plate, and this reflector plate is attached on this inclined-plane.
8. planar light source device according to claim 2 is characterized in that: the bottom surface of this two light-guide device and this exiting surface are to be arranged in parallel.
9. planar light source device according to claim 2 is characterized in that: the bottom surface of this two light-guide device is provided with a plurality of V-grooves, and this V-groove is parallel with this incidence surface.
10. planar light source device according to claim 2 is characterized in that: a plurality of sites of arranging, the bottom surface of this two light-guide device, this site become ranks to arrange.
11., it is characterized in that according to claim 2 or 3 described planar light source devices: this at least two fluorescent tube away from the light-guide device side one lampshade is set respectively.
12. planar light source device according to claim 2 is characterized in that: with the bottom surface opposite position of this light-guide device reflecting plate is set, being reflected into this large-size light-conducting plate once more by the light of bottom surface outgoing.
13., it is characterized in that: set gradually diffuser plate and prism plate with the exiting surface opposite position of this light-guide device according to claim 2 or 3 described planar light source devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02249711 CN2580476Y (en) | 2002-11-19 | 2002-11-19 | Surface light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02249711 CN2580476Y (en) | 2002-11-19 | 2002-11-19 | Surface light source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2580476Y true CN2580476Y (en) | 2003-10-15 |
Family
ID=33720086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02249711 Expired - Lifetime CN2580476Y (en) | 2002-11-19 | 2002-11-19 | Surface light source device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2580476Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943357A (en) * | 2010-07-14 | 2011-01-12 | 深圳市华星光电技术有限公司 | Backlight module capable of dynamically adjusting brightness and method thereof |
| CN101592824B (en) * | 2008-05-30 | 2011-11-09 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN106133561A (en) * | 2014-03-27 | 2016-11-16 | 东丽株式会社 | Reflector plate, planar light source device reflector element and planar light source device |
| CN110346862A (en) * | 2019-02-11 | 2019-10-18 | 友达光电股份有限公司 | Display device and its backlight module |
-
2002
- 2002-11-19 CN CN 02249711 patent/CN2580476Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592824B (en) * | 2008-05-30 | 2011-11-09 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN101943357A (en) * | 2010-07-14 | 2011-01-12 | 深圳市华星光电技术有限公司 | Backlight module capable of dynamically adjusting brightness and method thereof |
| US8730150B2 (en) | 2010-07-14 | 2014-05-20 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight module |
| CN106133561A (en) * | 2014-03-27 | 2016-11-16 | 东丽株式会社 | Reflector plate, planar light source device reflector element and planar light source device |
| CN106133561B (en) * | 2014-03-27 | 2019-11-08 | 东丽株式会社 | Reflector plate, planar light source device reflector element and planar light source device |
| CN110346862A (en) * | 2019-02-11 | 2019-10-18 | 友达光电股份有限公司 | Display device and its backlight module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121119 Granted publication date: 20031015 |