CN1508602A - Area light source device and light board thereof - Google Patents
Area light source device and light board thereof Download PDFInfo
- Publication number
- CN1508602A CN1508602A CNA021497109A CN02149710A CN1508602A CN 1508602 A CN1508602 A CN 1508602A CN A021497109 A CNA021497109 A CN A021497109A CN 02149710 A CN02149710 A CN 02149710A CN 1508602 A CN1508602 A CN 1508602A
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- Prior art keywords
- guide plate
- light source
- light
- light guide
- opposite side
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- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention is a kind of surface source device for liquid monitor. The device comprises a light board and at least a source. The light board at least comprises an entrance face for receiving beams, a light exit face intersecting with the entrance face and a back face opposite to the entrance. The light house is at one side of the entrance face. The back face has a round or rectangular scattering spot.
Description
[technical field]
The present invention is about a kind of planar light source device and be applied to light guide plate in this planar light source device.
[background technology]
Because of panel of LCD itself is not had a characteristics of luminescence, need planar light source device provide uniform in-plane light, to obtain good visual effect for it.
The prior art planar light source device comprises light source and light guide plate, the incidence surface setting of the relative light guide plate of light source, and the transmission direction that this light-guide plate guides is sent light beam from light source converts line source or pointolite to the area source outgoing.The bottom surface of this light guide plate a plurality of scattering points that distribute in order to the total reflection condition of broken beam in the light guide plate internal transmission, and make its scattering improving the homogeneity of light guide plate outgoing beam, and then promote the overall performance of planar light source device.The density of this site, size all can have different designs to adapt to different planar light source devices.Wherein light source mainly comprises pointolite and line source, and the line source device adopts cold cathode fluorescent lamp usually, a little less than this kind line source two end radiance degree distribute; Pointolite adopts LED (Light EmittingDiode, light emitting diode) light source usually, and for the different led light source of specification, it has different lighting angles.
See also Fig. 1, a kind of prior art planar light source device 10 comprises a light guide plate 120 and is arranged at the line source 110 of these light guide plate 120 1 sides.Since the briliancy of line source 110 be distributed in two ends a little less than, the middle part is stronger, makes the place, two end angles of light guide plate 120 contiguous light sources 110 have dark space 130 and occurs, thereby influence the uniformity coefficient of light guide plate 120 emergent lights.
See also Fig. 2, the led light source 210 and that another kind of prior art planar light source device 20 comprises a light guide plate 220, be arranged at light guide plate 220 1 sides is arranged at the reflecting plate (figure does not show) of these light guide plate 220 bottom surfaces.The light that led light source 210 sends with certain lighting angle enters into light guide plate 220, its light energy distribution that enters light guide plate 220 is also inhomogeneous, wherein minimum in part zone 230 briliancy of being close to light source 210 and be positioned at outside the lighting angle, thus light guide plate 220 outgoing uniformities of light influenced.
[summary of the invention]
For solving the prior art planar light source device, the invention provides a kind of emitting uniform planar light source device because of the energy of light source skewness causes the uneven technical matters of light energy distribution of its outgoing.
The present invention also provides a kind of light guide plate that is used for above-mentioned planar light source device.
The technical scheme of technical solution problem of the present invention provides a planar light source device, and it comprises a light guide plate and at least one light source.This light guide plate comprise at least one in order to the incidence surface that receives light, one with the crossing light-emitting face of incidence surface and one and this light-emitting face opposed bottom surface.This light source is arranged at corresponding incidence surface one side.This bottom surface is provided with square and circular scattering point, and square scattering point is positioned at the corresponding bottom surface, weak district that is incident to the luminous energy of this light guide plate from light source.
It is a kind of in order to cooperating the light guide plate of at least one external light source that the present invention also provides, it comprise at least one in order to the incidence surface that receives the external light source incident light, one with the crossing light-emitting face of incidence surface and one and this light-emitting face opposed bottom surface.This bottom surface is provided with square and circular scattering point, and square scattering point is positioned at the corresponding bottom surface, weak district that is incident to the luminous energy of this light guide plate from external light source.
Compared to prior art, the present invention has following advantage: be provided with the light guide plate of square and circular scattering point because of planar light source device of the present invention adopts the bottom surface, and square scattering point is positioned at the corresponding bottom surface, weak district that is incident to the luminous energy of this light guide plate from light source, square scattering point scattering power is stronger relatively, circular scattering point scattering power relatively a little less than, thereby make planar light source device of the present invention have good uniformity coefficient.
[description of drawings]
Fig. 1 is the synoptic diagram of prior art planar light source device.
Fig. 2 is the synoptic diagram of another prior art planar light source device.
Fig. 3 is the stereographic map of first embodiment of the invention planar light source device.
Fig. 4 is a light guide plate scattering point distribution schematic diagram shown in Figure 3.
Fig. 5 is the synoptic diagram of second embodiment of the invention planar light source device.
Fig. 6 is the synoptic diagram of third embodiment of the invention planar light source device.
[embodiment]
See also Fig. 3 and Fig. 4, the planar light source device 3 of the present invention's first embodiment comprises light guide plate 32 and is arranged at the light source 31 of light guide plate 32 1 sides.Light guide plate 32 comprise the light-emitting face 325 that intersects in order to the incidence surface 321 that receives light, direct light outgoing and with incidence surface 321 and with light-emitting face 325 opposed bottom surface 323.Light source 31 is the line source that is arranged at incidence surface 321 1 sides of light guide plate 32, for example cold cathode fluorescent lamp.Because of light source 31 briliancy skewness own, centre partly briliancy distributes strong and even, two end briliancy distribute more weak and briliancy by two ends to partly crescendo of centre, so be incident to contiguous light source 31 light guide plate 32 two opposite side corners, 327 luminous energies a little less than, cause from light source 31 be incident to light guide plate 32 luminous energy weak district emergent light briliancy a little less than, form the dark space.Each opposite side corner 327 roughly is fan-shaped.
For solving the more weak problem of two opposite side corners, 327 briliancy of light guide plate 32, can scattering point be set in 323 zones, bottom surface of two opposite side corners, 327 correspondences, to destroy the light beam total reflection condition that is incident to 327 places, opposite side corner from light source 31, make light beam generation scattering, cause light beam to increase from the 327 places outgoing of opposite side corner, strengthening dark space radiance degree, and then improve the emergent light uniformity coefficient of light-emitting face 325.For further promoting the uniformity coefficient of planar light source device 3, can in the bottom surface 323 of light guide plate 32 square scattering point 328 and circular scattering point 329 be set simultaneously, and square scattering point 328 is positioned at 327 corresponding bottom surfaces 323, two opposite side corners partly regional, and circular scattering point 329 is positioned at other part of bottom surface 323.Square scattering point 328 can remedy the lower shortcoming of two opposite side corners, 327 place's emergent light briliancy that causes light guide plate 32 because of light source 31 briliancy skewness with respect to circular scattering point 329 tools scattering efficiency preferably.Square scattering point 328 and circular scattering point 329 from close light source 31 side direction of light guide plate 32 away from the ascending bottom surface 323 that is distributed in of light source 31 sides.
See also Fig. 5, the planar light source device 4 of the present invention's second embodiment comprises a light guide plate 42 and is positioned at the light source 41 of light guide plate 42 2 opposite sides.The light-emitting face (figure does not show) that light guide plate 42 comprises two incidence surfaces (indicate), intersect with this two incidence surface and with light-emitting face opposed bottom surface 423.Light source 41 is line source, for example cold cathode fluorescent lamp.Because of light source 41 briliancy skewness own, intermediate portion part briliancy distributes strong and even, two end briliancy distribute more weak and briliancy by two ends to partly crescendo of centre, so be incident to contiguous light source 41 light guide plate 42 opposite side corner 427 luminous energies a little less than, cause from light source 41 be incident to light guide plate 32 luminous energy weak district emergent light briliancy a little less than, form the dark space.
For solving the more weak problem of emergent light briliancy at 427 places, two opposite side corners, can scattering point be set 427 corresponding bottom surfaces 423 in the opposite side corner, this scattering point can destroy the light beam total reflection condition that is incident to 427 places, opposite side corner from light source 41, make light beam generation scattering, cause light beam to increase from the 427 places outgoing of opposite side corner, strengthening dark space radiance degree, and then improve the emergent light uniformity coefficient of light guide plate 42.For further promoting uniformity coefficient, can be set to square scattering point 428 in 427 corresponding bottom surfaces 423 in the opposite side corner, simultaneously in the bottom surface 423 other partly be set to circular scattering point 429.Square scattering point 428 and circular scattering point 429 are from the ascending bottom surface 423 that is distributed in of close light source 41 lateral guide tabula rasas 42 pars intermedias of light guide plate 42.
See also Fig. 6, the planar light source device 5 of the present invention's the 3rd embodiment comprises a light guide plate 52 and is positioned at least one light source 51 of light guide plate 52 1 sides.The light-emitting face (figure does not show) that light guide plate 52 comprises incidence surface (indicate), intersect with incidence surface and with light-emitting face opposed bottom surface 523.Light source 51 is a led light source.Because of light source 51 has certain lighting angle, when it is arranged at light guide plate 52 1 sides, the part that is positioned at the extra-regional light guide plate 52 of light source 51 lighting angles enter luminous energy a little less than, cause from light source 51 be incident to light guide plate 52 luminous energy weak district emergent light briliancy a little less than, form the dark space.When light source 51 only was one, the dark space was two opposite side corners 527 of the light guide plate 52 of contiguous light source 51.When light source 51 is two or more for a long time, the dark space is the two opposite side corners 527 of the light guide plate 52 of contiguous light source 51 and the delta-shaped region (indicating) of contiguous light source 51 and the light guide plate 52 between two adjacent light sources 51.
Uniformity coefficient for the emergent light that promotes light guide plate 52, can scattering point be set in the dark space, this scattering point can destroy the light beam total reflection condition that is incident to the dark space from light source 51, make light beam generation scattering, cause light beam to increase from the part outgoing of dark space correspondence, strengthening brilliant degree, and then improve the emergent light uniformity coefficient of light guide plate 52.For further promoting briliancy and uniformity coefficient, can square scattering point 528 be set corresponding bottom surface 523 in the dark space, simultaneously in the bottom surface 523 other circular scattering point 529 partly is set.Square scattering point 528 and circular scattering point 529 from close light source 51 side direction of light guide plate 52 away from the ascending distribution of light source 51 sides.
Claims (10)
1. planar light source device, it comprises an at least one light source and a light guide plate, this light guide plate comprise at least one in order to the incidence surface that receives light, one with the crossing light-emitting face of incidence surface and one and this light-emitting face opposed bottom surface, this light source is arranged at this incidence surface one side, it is characterized in that: this bottom surface is provided with square and circular scattering point, and square scattering point is positioned at the corresponding bottom surface, weak district that is incident to the luminous energy of this light guide plate from light source.
2. planar light source device according to claim 1 is characterized in that: this at least one light source is a line source, and the weak district of the luminous energy of this light guide plate is two opposite side corners of the light guide plate of contiguous this line source, and each opposite side corner is fan-shaped.
3. planar light source device according to claim 1, it is characterized in that: this at least one incidence surface is two incidence surfaces, this at least one light source is two line sources, and the weak district of the luminous energy of this light guide plate is four opposite side corners of the light guide plate of contiguous this two line source, and each opposite side corner is fan-shaped.
4. planar light source device according to claim 3 is characterized in that: this square scattering point and circular scattering point are by contiguous this light source side ascending this bottom surface that is distributed in the middle part of this light guide plate.
5. planar light source device according to claim 1 is characterized in that: this at least one light source is a pointolite, and the weak district of the luminous energy of this light guide plate is two opposite side corners of the light guide plate of contiguous this pointolite, and each opposite side corner is triangular in shape.
6. planar light source device according to claim 1 is characterized in that: at least one light source is the pointolite that is arranged at the same side of this light guide plate.
7. planar light source device according to claim 6 is characterized in that: the weak district of the luminous energy of this light guide plate is this bottom surface delta-shaped region between two opposite side corners of the light guide plate of contiguous this pointolite and adjacent pointolite.
8. one kind in order to cooperate the light guide plate of at least one external light source, it comprises: at least one in order to the incidence surface that receives the external light source incident light, one with the crossing light-emitting face of incidence surface and one and this light-emitting face opposed bottom surface, it is characterized in that: this bottom surface is provided with square and circular scattering point, and square scattering point is positioned at the corresponding bottom surface, weak district that is incident to the luminous energy of this light guide plate from external light source.
9. light guide plate according to claim 8 is characterized in that: the weak district of the luminous energy of this light guide plate is two opposite side corners of contiguous this at least one incidence surface, and each opposite side corner is fan-shaped or triangle.
10. light guide plate according to claim 8 is characterized in that: the weak district of the luminous energy of this light guide plate for two opposite side corners of contiguous this at least one incidence surface and be positioned at this two opposite side corner between delta-shaped region, and each opposite side corner is triangular in shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021497109A CN100363808C (en) | 2002-12-20 | 2002-12-20 | Area light source device and light board thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021497109A CN100363808C (en) | 2002-12-20 | 2002-12-20 | Area light source device and light board thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1508602A true CN1508602A (en) | 2004-06-30 |
| CN100363808C CN100363808C (en) | 2008-01-23 |
Family
ID=34233758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021497109A Expired - Fee Related CN100363808C (en) | 2002-12-20 | 2002-12-20 | Area light source device and light board thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100363808C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370283C (en) * | 2004-12-24 | 2008-02-20 | 鸿富锦精密工业（深圳）有限公司 | Guiding light plate |
| CN100462802C (en) * | 2005-10-14 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Backlight module and light guiding plate thereof |
| CN100483208C (en) * | 2005-07-06 | 2009-04-29 | 鸿富锦精密工业（深圳）有限公司 | Light-guiding board and back-light module using same |
| CN102032529A (en) * | 2010-10-25 | 2011-04-27 | 苏州向隆塑胶有限公司 | Light-guiding assembly |
| CN101566289B (en) * | 2008-04-24 | 2014-07-16 | 三星显示有限公司 | Backlight assembly and display device having the same |
| CN107870468A (en) * | 2017-11-30 | 2018-04-03 | 盛天誉 | Study display device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3429387B2 (en) * | 1995-03-31 | 2003-07-22 | 株式会社エンプラス | Sidelight type surface light source device |
| JP3632165B2 (en) * | 1997-01-14 | 2005-03-23 | ミネベア株式会社 | Surface light source device |
| JP3654410B2 (en) * | 1997-08-11 | 2005-06-02 | 株式会社エンプラス | Sidelight type surface light source device, liquid crystal display device, and light guide plate |
| JP2002108227A (en) * | 2000-07-26 | 2002-04-10 | Bridgestone Corp | Front light and liquid crystal display device |
-
2002
- 2002-12-20 CN CNB021497109A patent/CN100363808C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370283C (en) * | 2004-12-24 | 2008-02-20 | 鸿富锦精密工业（深圳）有限公司 | Guiding light plate |
| CN100483208C (en) * | 2005-07-06 | 2009-04-29 | 鸿富锦精密工业（深圳）有限公司 | Light-guiding board and back-light module using same |
| CN100462802C (en) * | 2005-10-14 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Backlight module and light guiding plate thereof |
| CN101566289B (en) * | 2008-04-24 | 2014-07-16 | 三星显示有限公司 | Backlight assembly and display device having the same |
| CN102032529A (en) * | 2010-10-25 | 2011-04-27 | 苏州向隆塑胶有限公司 | Light-guiding assembly |
| CN107870468A (en) * | 2017-11-30 | 2018-04-03 | 盛天誉 | Study display device |
| CN107870468B (en) * | 2017-11-30 | 2020-10-02 | 盛天誉 | Display device for learning |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100363808C (en) | 2008-01-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080123 Termination date: 20171220 |