CN100363813C - Area source device - Google Patents
Area source device Download PDFInfo
- Publication number
- CN100363813C CN100363813C CNB031469140A CN03146914A CN100363813C CN 100363813 C CN100363813 C CN 100363813C CN B031469140 A CNB031469140 A CN B031469140A CN 03146914 A CN03146914 A CN 03146914A CN 100363813 C CN100363813 C CN 100363813C
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- China
- Prior art keywords
- guide plate
- light guide
- light source
- incidence
- source device
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- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The present invention relates to an area light source device which comprises at least one light emitting diode, at least one reflector and a light guide board, wherein the light guide board comprises at least one incident surface, an emergent surface, a bottom surface corresponding to the emergent surface and a plurality of side surfaces; the reflector is in a slot-type structure with two side walls, is positioned at the side of the incident surface of the light guide board and is clamped with the incident surface to form a cavity for holding the light emitting diode.
Description
[technical field]
The present invention relates to a kind of planar light source device, refer to a kind of planar light source device that adopts light emitting diode as light source especially.
[background technology]
The planar light source device of LCD adopts line source or pointolite as light source usually.Line source generally is cold cathode ray tube (Cold Cathode Fluorescent Lamp is called for short CCFL), and pointolite generally is light emitting diode (Light-Emitting Diode is called for short LED).
Please refer to Fig. 1, is a kind of stereographic map of prior art planar light source device.This planar light source device 1 comprises a plurality of light sources 11 and a light guide plate 12, evenly offer a plurality of circular grooves 122 on the plane of incidence 121 of this light guide plate 12, these a plurality of pointolites 11 are light emitting diodes, be arranged at respectively in this circular groove 122, the light beam 111 that this pointolite 11 sends enters light guide plate 12 from circular groove 122.Because this pointolite 11 has certain lighting angle, near the plane of incidence 121 of light guide plate 12, will form a plurality of dark spaces (not indicating), this dark space is between two consecutive point light sources 11, thus the outgoing light homogeneity of influence surface light supply apparatus 1.
Please refer to Fig. 2, is the 6th, 139, No. 163 disclosed a kind of planar light source devices of United States Patent (USP) of bulletin on October 31st, 2000.This planar light source device 2 comprises a pointolite 21 and a light guide plate 22, and wherein this light guide plate 22 has the reflection hole 223 that a V-arrangement reflecting surface 221, an exit facet 222 and are positioned at light guide plate 22 inside.The summit of V-arrangement reflecting surface 221 is provided with a circular arc plane of incidence 224, receives by pointolite 21 emitted light beams 211, and the dual-side of V-arrangement reflecting surface 221 is made of reflecting wall 225 and the reflection groove 226 that a plurality of intervals are provided with respectively.This hole 223 is roughly isosceles triangle.This pointolite 21 is LED, and the circular arc plane of incidence 224 is provided with relatively.
The light beam 211 that pointolite 21 sends enters light guide plate 22 from the circular arc plane of incidence 224, these hole 223 reflected illumination light beam 211 thereon, and and this reflecting wall 225, reflection groove 226 actings in conjunction with even guiding light guide plate 22 inside of light beam 211, derive by exit facet 222 at last.
Yet, though the project organization of the V-arrangement reflecting surface 221 of this planar light source device 2 has solved the uneven defective of bright dipping in the prior art shown in Figure 1, but a plurality of reflecting walls 225 and reflection groove 226 need be set, complex structural designs, cost of manufacture height on the V-arrangement reflecting surface 221.
[summary of the invention]
For solving the prior art planar light source device is to make bright dipping evenly make the defective of complex structural designs, the invention provides the even and simple planar light source device of structural design of a kind of bright dipping.
The technical solution adopted for the present invention to solve the technical problems is: a kind of planar light source device is provided, it comprises at least one light emitting diode, at least one reflecting body and a light guide plate, this light guide plate comprises at least one plane of incidence, an exit facet, one and the corresponding bottom surface of this exit facet and a plurality of side, wherein this reflecting body is the trench structure with two sidewalls, and it is positioned at this light guide plate plane of incidence one side and folds formation one cavity to hold this light emitting diode with it.
Compared with prior art, the advantage of planar light source device of the present invention is: planar light source device of the present invention is provided with reflecting body in the light guide plate plane of incidence one side, the light that reflection is launched from light emitting diode, inject in the light guide plate through the reflecting body light reflected, and from the exit facet outgoing, both can produce uniform emergent ray, and make this planar light source device project organization simple again.
[description of drawings]
Fig. 1 is the stereographic map of prior art planar light source device.
Fig. 2 is the stereographic map of another prior art planar light source device.
Fig. 3 is the stereographic map of planar light source device first embodiment of the present invention.
Fig. 4 is the sectional view of Fig. 3 along the IV-IV direction.
Fig. 5 is the stereographic map of planar light source device second embodiment of the present invention.
Fig. 6 is the stereographic map of planar light source device the 3rd embodiment of the present invention.
Fig. 7 is the stereographic map of planar light source device the 4th embodiment of the present invention.
Fig. 8 is the stereographic map of planar light source device the 5th embodiment of the present invention.
Fig. 9 is the stereographic map of planar light source device the 6th embodiment of the present invention.
[embodiment]
Please refer to Fig. 3 and Fig. 4, is respectively the stereographic map of planar light source device first embodiment of the present invention and this stereographic map sectional view along the IV-IV direction.This planar light source device 3 comprises a light guide plate 31, a brightening piece 32, two reflecting bodys 33 and two light emitting diodes 34.Wherein, this brightening piece 32 is attached on the incidence surface 311 of this light guide plate 31, this two reflecting body 33 all is the V-type trough body structure, be symmetrically distributed with the incidence surface 311 of this light guide plate 31, comprise the first side wall 331 and second sidewall 333, wherein this first side wall 331 respectively with 311 liang of terminal vertical connections of incidence surface of this light guide plate 31,333 liang of ends of second sidewall join with the incidence surface 311 of this first side wall 331 and this light guide plate 31 respectively, to form the reflecting surface relative with incidence surface 311, and form cavity 35 and cavity 36, this cavity 35 and cavity 36 hold this two light emitting diode 34 respectively, wherein this two light emitting diode 34 is fixed on the first side wall 331 inboards of this two reflecting body 33, the light that this light emitting diode 34 is sent is respectively at cavity 35, propagate in 36, wherein this cavity 35 and cavity 36 are symmetrically distributed with respect to this light guide plate 31.This light emitting diode 34 is arranged at the top of this cavity 35 and cavity 36 respectively, its issued light line after reflecting body 33 reflection, round-trip transmission cavity 35 or cavity 36 in, and through in this light guide plate 31 of importing behind brightening piece 32 light harvestings.
The exiting surface 313 of this light guide plate 31 is provided with V-shaped groove (figure does not show) to strengthen the briliancy of emergent light, and this V-shaped groove can be trapezoidal, circular-arc or other shape; The bottom surface 312 of this light guide plate 31 can be provided with light diffuser screen dot matrix (figure does not show) so that light transmits to different directions in light guide plate 31, make emergent ray more even.Each site is shapes such as microprism shape, point-like, square, spherical shape, cylindric, square or pyramid in this light diffuser screen dot matrix, and wherein the density of scattering point is to increase progressively arrangement along the direction away from this incidence surface 311.
This light guide plate 31 is to make with transparent materials such as acryl resin, polycarbonate, polyvinyl resin or glass.This reflecting body 33 can adopt high light reflectivity rate material, also reflectance coating directly can be plated on the v-depression framework, the diverse location of reflecting body 33 can be provided with the different site of density (figure does not show), to strengthen light reflection and scattering degree, makes distribution of light more even.
Second and third embodiment of planar light source device of the present invention all is architecture advances of doing about reflecting body.
Planar light source device second embodiment of the present invention as shown in Figure 5, this planar light source device 4 comprises a light guide plate 41, a brightening piece 42, two reflecting bodys 43 and two light emitting diodes 44.Compare with the reflecting body of the v-depression body structure of first embodiment, reflecting body 43 second sidewalls 433 of second embodiment are arcuate structures.
Planar light source device the 3rd embodiment of the present invention as shown in Figure 6, this planar light source device 5 comprises a light guide plate 51, a brightening piece 52, two reflecting bodys 53 and two light emitting diodes 54.Compare with the reflecting body of the v-depression body structure of first embodiment, reflecting body 53 second sidewalls 533 inside surfaces of the 3rd embodiment are the sawtooth pattern structures.
Seeing also Fig. 7, is the sectional view of planar light source device the 4th embodiment of the present invention, and this planar light source device 6 comprises a plate shaped light guide plate 61, a plurality of brightening piece 62, two reflecting bodys 63 and two light emitting diodes 64.Wherein, these brightening piece 62 length are half of light guide plate 61 incidence surfaces 611 length, one brightening piece 62 is attached to first zone of these light guide plate 61 1 incidence surfaces 611, another brightening piece 62 is attached at second zone of these light guide plate 61 another incidence surfaces 612, attach reflector plate 67 to prevent beam projecting in second zone of incidence surface 611 and first zone of incidence surface 612, this two reflecting body 63 can be in first to the 3rd embodiment any reflector structure (as Fig. 7, Fig. 8 or shown in Figure 9), the incidence surface 611 of itself and light guide plate 61 folds and forms first cavity 65 and second cavity 66, this first cavity 65 and second cavity 66 are used for holding this light emitting diode 64 respectively and transmit the light that light emitting diode 64 is sent, and wherein this first cavity 65 and second cavity 66 are with light guide plate 61 center symmetries.This two light emitting diode 64 to be arranged at being provided with of this first embodiment light emitting diode similar, the light that it sent is after reflector plate 63 reflections, round-trip transmission in first cavity 65 or second cavity 66, and behind brightening piece 62 light harvestings, import in this light guide plate 61.
In addition, the reflecting body number can be one, is arranged on the light guide plate plane of incidence one side, and with plane of incidence equal in length; And for reducing the assembly and the cost of planar light source device, V-shaped groove (figure does not show) can be set on the incidence surface of light guide plate replace brightening piece, this V-shaped groove is shaped as the different shape that trapezoidal, circular-arc or ellipse etc. can produce the light harvesting function.Wherein this V-shaped groove and light guide plate one ejection formation, or with method manufacturings such as chemical etching texture method, laser direct-writing method, precision optical machinery processing methods.
Claims (9)
1. planar light source device, it comprises at least one light emitting diode, at least one reflecting body and a light guide plate, this light guide plate comprises at least one plane of incidence, an exit facet, one and the corresponding bottom surface of this exit facet and a plurality of side, it is characterized in that: this reflecting body is the trench structure that comprises first, second two sidewalls, and it is positioned at this light guide plate plane of incidence one side and folds formation one cavity to hold this light emitting diode with it.
2. planar light source device according to claim 1 is characterized in that: a plane of incidence one side of this light guide plate is provided with two reflecting bodys, and this two reflecting body is symmetrically distributed with respect to the plane of incidence of light guide plate.
3. planar light source device according to claim 1 is characterized in that: two planes of incidence of this light guide plate are respectively arranged with a reflecting body, and this two reflecting body is symmetrically distributed with respect to the plane of incidence of light guide plate.
4. according to claim 1,2 or 3 described planar light source devices, it is characterized in that: the wherein the first side wall of this reflecting body and the plane of incidence of light guide plate end contact and fold and meet at right angles, and the plane of incidence of second sidewall and light guide plate contacts.
5. according to claim 1,2 or 3 described planar light source devices, it is characterized in that: this reflecting body is a V-type groove structure.
6. according to claim 1,2 or 3 described planar light source devices, it is characterized in that: this reflecting body second sidewall is the camber structure.
7. according to claim 1,2 or 3 described planar light source devices, it is characterized in that: this reflecting body second sidewall is the sawtooth pattern structure.
8. according to claim 1,2 or 3 described planar light source devices, it is characterized in that: this light emitting diode is fixed on the first side wall inboard.
9. according to claim 1,2 or 3 described planar light source devices, it is characterized in that: the plane of incidence of this light guide plate posts brightening piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031469140A CN100363813C (en) | 2003-09-19 | 2003-09-19 | Area source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031469140A CN100363813C (en) | 2003-09-19 | 2003-09-19 | Area source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1598670A CN1598670A (en) | 2005-03-23 |
| CN100363813C true CN100363813C (en) | 2008-01-23 |
Family
ID=34659717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031469140A Expired - Fee Related CN100363813C (en) | 2003-09-19 | 2003-09-19 | Area source device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100363813C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725908B (en) * | 2008-10-28 | 2014-05-14 | 群创光电股份有限公司 | Backlight module and light guide plate thereof |
| CN103217733A (en) * | 2012-01-19 | 2013-07-24 | 扬昕科技(苏州)有限公司 | Light guide plate and backlight module |
| CN102840521B (en) * | 2012-09-28 | 2015-06-10 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN109116464B (en) * | 2018-08-31 | 2020-06-30 | 合肥泰沃达智能装备有限公司 | Backlight module for light incidence side microstructure of light guide plate |
| CN112037674B (en) * | 2020-09-22 | 2022-09-06 | 京东方科技集团股份有限公司 | Area light source, manufacturing method thereof and display device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0594709A (en) * | 1990-12-27 | 1993-04-16 | Toshiba Lighting & Technol Corp | Reflecting plate |
| JP2001035229A (en) * | 1999-07-22 | 2001-02-09 | Citizen Electronics Co Ltd | Surface light source unit |
| JP2001060410A (en) * | 1999-08-20 | 2001-03-06 | Citizen Electronics Co Ltd | Sheet-like light source unit |
| CN1316668A (en) * | 2000-03-24 | 2001-10-10 | 株式会社日立制作所 | Liquid crystal display device |
| JP2002250820A (en) * | 2001-02-26 | 2002-09-06 | Kawaguchiko Seimitsu Co Ltd | Structure of light guide plate and electronic equipment having the plate |
| TW538211B (en) * | 2002-07-19 | 2003-06-21 | Au Optronics Corp | Backlight module of direct-underneath type |
-
2003
- 2003-09-19 CN CNB031469140A patent/CN100363813C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0594709A (en) * | 1990-12-27 | 1993-04-16 | Toshiba Lighting & Technol Corp | Reflecting plate |
| JP2001035229A (en) * | 1999-07-22 | 2001-02-09 | Citizen Electronics Co Ltd | Surface light source unit |
| JP2001060410A (en) * | 1999-08-20 | 2001-03-06 | Citizen Electronics Co Ltd | Sheet-like light source unit |
| CN1316668A (en) * | 2000-03-24 | 2001-10-10 | 株式会社日立制作所 | Liquid crystal display device |
| JP2002250820A (en) * | 2001-02-26 | 2002-09-06 | Kawaguchiko Seimitsu Co Ltd | Structure of light guide plate and electronic equipment having the plate |
| TW538211B (en) * | 2002-07-19 | 2003-06-21 | Au Optronics Corp | Backlight module of direct-underneath type |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1598670A (en) | 2005-03-23 |
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Granted publication date: 20080123 Termination date: 20170919 |
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| CF01 | Termination of patent right due to non-payment of annual fee |