CN100437288C - Area light sources - Google Patents
Area light sources Download PDFInfo
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- CN100437288C CN100437288C CNB021605998A CN02160599A CN100437288C CN 100437288 C CN100437288 C CN 100437288C CN B021605998 A CNB021605998 A CN B021605998A CN 02160599 A CN02160599 A CN 02160599A CN 100437288 C CN100437288 C CN 100437288C
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- light
- guide plate
- area source
- source
- light guide
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- Planar Illumination Modules (AREA)
Abstract
The present invention relates to a surface light source applied to liquid crystal displays, which comprises a plurality of point light sources and a light conducting plate, wherein the light conducting plate comprises a light incidence face, a light emergence face crossed with the light incidence face, and a bottom; the point light sources are positioned at one side of the light incidence face of the light conducting plate; the bottom is provided with net points; a plurality of net points positioned in an area with weak irradiation light intensity of a light source of the bottom are made of fluorescent and melamine resin particles.
Description
[technical field]
The present invention is about a kind of light supply apparatus, especially about a kind of area source that is applied to LCD as even face light.
[background technology]
Present stage, LCD is fast because of its reaction velocity, display quality is preferable, radiationless, be applicable to advantages such as large-scale animation display, be widely used in notebook, desk-top computer monitor, workstation, industry monitoring device, Global Positioning System (GPS) (GPS), personal data processing, game machine, videophone, portable V CD, DVD and some other mancarried devices.So, liquid crystal itself is not luminous, must have an area source to provide display image required light for it.And display panels is made up of a plurality of liquid crystal cells, and each liquid crystal cells is to the same requirement of having obtained of light, so this area source must be the equally distributed area source of glorious degrees.Usually the light source in the area source has two kinds of line source and pointolites, the difference of light source character and position setting thereof, and the structural design thought of this area source is also with regard to corresponding difference.
Please see Figure 1, a kind of commonly used be that the area source 10 of light source includes the prism plate and diffuser plate (scheming not show) that a plurality of pointolites 13, a light guide plate 15, are attached at the reflecting plate (figure does not show) of light guide plate 15 bottom surfaces and are arranged at light guide plate 15 light-emitting faces with the pointolite.These a plurality of pointolites 13 are three light emitting diodes, evenly are spaced light entrance face one side in light guide plate 15 each other.The light that light guide plate 15 is sent pointolite 13 is converted into the area source outgoing.
In area source 10, because the emergent light as the light emitting diode of pointolite 13 is Gauss (Guass) light beam of the certain dispersion angle of tool, its outgoing briliancy changes along with the change of angle, light intensity reaches maximum value near the outgoing zero angle, and zero angle both sides light intensity diminishes gradually, do not pass through and have light beam near the exterior domain of the LED source angles of divergence in light guide plate 15, the zone that light beam intersects go out light intensity a little less than, make D, E among the figure, F, G zone briliancy deficiency, thereby light guide plate 15 and area source 10 whole bright dipping luminance nonuniformities are even.
[summary of the invention]
The even defective of light guide plate bright dipping luminance nonuniformity when solving that area source utilizes pointolite as light source in the background technology the invention provides a kind of area source that light guide plate bright dipping briliancy is evenly distributed when utilizing pointolite as light source.
The technical scheme of technical solution problem of the present invention provides a kind of area source, it comprises a plurality of pointolites and a light guide plate, this light guide plate comprises a light entrance face and one and the light entrance face light-emitting face and the bottom surface of intersecting, these a plurality of pointolites are positioned light guide plate light entrance face one side, and per two light emitted bundles of consecutive point light source intersect and form the more weak zone of light intensity on described light guide plate light bottom surface; This bottom surface is provided with the site, and a plurality of sites that wherein are positioned at the more weak zone of light source irradiation light intensity, bottom surface are to be made by fluorescent-melamine resin particle (MelamineBased Fluorescent Particles).
Because fluorescent-melamine resin particle has good fluorescent effect, light emitting diode is as the light source of area source the time, also excite fluorescent-melamine resin particle emission fluorescent, be the more weak zone of light intensity, bottom surface a plurality of sites not only scattering arrive light emitting diode emergent light in the more weak zone of light intensity, bottom surface, itself also sends fluorescent, become a plurality of pointolites that are dispersed on the more weak zone of bottom surface light intensity, fluorescent that this a plurality of pointolite is launched just can compensate light intensity defect of insufficient in these zones, and makes the outgoing briliancy of whole area source be evenly distributed.
[description of drawings]
Fig. 1 is the stereographic map of area source in the background technology.
Fig. 2 is the schematic perspective view of first embodiment of the invention area source.
Fig. 3 is the network point distribution synoptic diagram of area source shown in Figure 2.
Fig. 4 is the network point distribution synoptic diagram of another embodiment area source of the present invention.
Fig. 5 is the microtexture synoptic diagram that is positioned at site, the more weak zone of bottom surface light intensity among Fig. 2.
[embodiment]
Please see Figure 2 and Fig. 3, it is area source 20 of the present invention, it includes a plurality of light emitting diodes 21 and a light guide plate 22, light guide plate 22 roughly becomes the dull and stereotyped entity of a rectangular parallelepiped, it includes a light entrance face 221, with the vertical light-emitting face 222 of light entrance face 221, bottom surface 223, first side 224, with first side, 224 second side surface opposite (indicating) and three side (indicate) relative with light entrance face 221.These a plurality of light emitting diodes 21 are positioned light guide plate 22 light entrance faces 221 1 sides.And light entrance face 221 caves inward over against the surface of light emitting diode 21 respectively and is curved surface, so that fixedly light emitting diode 21 and light path good coupling with it.
Can change direct of travel for making the light of injecting light guide plate from light entrance face, and oneself and the perpendicular even outgoing of light-emitting face of light entrance face, usually be provided with the site in bottom surface of light guide plate and come the total reflection condition of broken beam, and the refraction of optical beam that is incident to this site changes into from the light-emitting face outgoing in the bottom surface of light guide plate conduction.One-body molded or be printed with site 23 in the area source 20 of the present invention in this light guide plate 22 bottom surfaces 223, the ball cross section body that it can be set to cave inward, right cylinder, four sides cylinder or Rotary-table shrinkage pool also can be outwards outstanding ball cross section body, right cylinder, four sides cylinder or Rotary-table.This site 23 is linear distribution bottom surfaces 223 in light guide plate 22, and is less near site 23 volumes of a plurality of light emitting diodes 21, bigger away from site 23 volumes of a plurality of light emitting diodes 21.This site 23 also can be uniformly distributed in the bottom surface 223 (please see Figure 4) of whole light guide plate 22, and the volume size is consistent.
The light beam that light emitting diode 21 sends is that tool certain angle, light distribution present the Gaussian beam that Gaussian function distributes, light guide plate 22 disperses near per two light emitting diodes of light emitting diodes 21 that Gaussian beam intersecting area light intensity is weak, luminance shortage, it is the darker dark space of briliancy, for compensating this dark space light intensity defect of insufficient, a plurality of site 23a that area source 20 of the present invention is positioned on the more weak regional 223a of corresponding bottom surface 223 light intensity in this dark space make (please see Figure 5) by fluorescent-melamine resin particle 25.Emergent light wavelength corresponding to different light emitting diodes 21, this fluorescent-melamine resin particle 25 can (FluoresceinIsothiocyanate, FITC) three primary colours fluorescent pigment such as green glow fluorescent pigment, Nile blue A (Nile Blue A) ruddiness fluorescent pigment or rhodamine toner B (Rhodamine B) gold-tinted fluorescent pigment and melamine resin be polymerized by Fluorescein Isothiocyanate.Wherein this Fluorescein Isothiocyanate green glow fluorescent pigment excitation source wavelength is 506nm, wavelength of transmitted light is 529nm, this Nile blue A ruddiness fluorescent pigment excitation source wavelength is 636nm, wavelength of transmitted light is 686nm, this rhodamine toner B gold-tinted fluorescent pigment excitation source wavelength is 560nm, and wavelength of transmitted light is 584nm.This fluorescent-melamine resin particle 25 diameters are between 1um～10um.
In addition, a plurality of site 23a that area source 20 is positioned on the more weak regional 223a of bottom surface 223 light intensity are necessarily all made by fluorescent-melamine resin particle, alternative as this embodiment, after these a plurality of site 23a and the 23 common moulding of other site or printing are made, the polymer film of forming at this a plurality of sites 23a coating surface one deck fluorescent-melamine resin particle 25 again.
Because fluorescent-melamine resin particle 25 has good fluorescent effect, light emitting diode 21 is as the light source of area source 20 time, also excite fluorescent-melamine resin particle 25 emission fluorescents, promptly these a plurality of site 23a not only scattering arrive light emitting diode 21 emergent lights in the more weak regional 223a of bottom surface light intensity, itself also sends fluorescent, become a plurality of pointolites that are dispersed on the more weak regional 223a of the corresponding bottom surface light intensity in dark space, fluorescent that this a plurality of pointolite is launched just can compensate light intensity defect of insufficient in these zones, and makes the outgoing briliancy of whole area source 20 be evenly distributed.
For improving the light utilization ratio; in this bottom surface 223 and this each side also be coated with reflectance coating usually or attach one deck reflecting plate (figure do not show) again; be incident upon the light beam of light guide plate 22 bottom surfaces 223 or side with reflection; it is returned in the light guide plate 22, be coated with anti-reflective film to reduce the absorption loss of luminous energy in this light entrance face 221 and light-emitting face 222 from light-emitting face 222 outgoing.
Certainly, the light emitting diode among the present invention also can substitute with other pointolite, and light guide plate also can be a wedge shape, and it is crossing that this wedge shape light guide plate and this rectangular parallelepiped tabular light guide plate difference are that its bottom surface and light entrance face acutangulate.Area source also can further be provided with a plurality of pointolites at least one side of light guide plate, a plurality of sites on the more weak zone of light intensity of corresponding bottom surface, dark space are by fluorescent-the melamine resin particle is made or plating has one deck fluorescent-melamine resin particulate polymer film, so, improving the light guide plate outgoing inhomogeneity while of briliancy, further improving the bright dipping briliancy of area source.
Claims (11)
1. area source, it comprises a plurality of pointolites and a light guide plate, and this light guide plate comprises a light entrance face and one and the light entrance face light-emitting face and the bottom surface of intersecting, and this bottom surface is provided with the site; These a plurality of pointolites are positioned light guide plate light entrance face one side, and per two light emitted bundles of consecutive point light source intersect and form the more weak zone of light intensity on described light guide plate light bottom surface; It is characterized in that: a plurality of sites that are positioned at the more weak zone of light source irradiation light intensity, bottom surface are to be made by fluorescent-melamine resin particle.
2. area source as claimed in claim 1 is characterized in that this fluorescent-melamine resin particle is to be polymerized by Fluorescein Isothiocyanate green glow fluorescent pigment and melamine, Nile blue A ruddiness fluorescent pigment and melamine or rhodamine toner B gold-tinted fluorescent pigment and melamine resin.
3. area source as claimed in claim 2, it is characterized in that this Fluorescein Isothiocyanate green glow fluorescent pigment excitation source wavelength is 506nm, wavelength of transmitted light is 529nm, this Nile blue A ruddiness fluorescent pigment excitation source wavelength is 636nm, wavelength of transmitted light is 686nm, this rhodamine toner B gold-tinted fluorescent pigment excitation source wavelength is 560nm, and wavelength of transmitted light is 584nm.
4. area source as claimed in claim 1 is characterized in that this fluorescent-melamine resin particle diameter is between 1um～10um.
5. area source as claimed in claim 1 is characterized in that the site on this bottom surface is the bottom surface that is uniformly distributed in light guide plate.
6. area source as claimed in claim 1 is characterized in that the site on this bottom surface is to be the bottom surface of linear distribution in light guide plate, and is less near the site volume of light source, bigger away from the site volume of light source.
7. area source as claimed in claim 1 is characterized in that the site on this bottom surface is one-body molded or prints sub-bottom surface of light guide plate.
8. area source as claimed in claim 1 is characterized in that the site on this bottom surface is ball cross section body, right cylinder, four sides cylinder shrinkage pool or the Rotary-table shrinkage pool that caves inward or the ball cross section body of outwards giving prominence to, right cylinder, four sides cylinder or Rotary-table.
9. area source as claimed in claim 1 is characterized in that this area source comprises that further a beam reflection that will be incident upon bottom surface of light guide plate returns the reflecting plate of light guide plate.
10. area source as claimed in claim 1 is characterized in that this area source further is coated with a reflectance coating in this bottom surface and site.
11., it is characterized in that these a plurality of pointolites are light emitting diodes as claim 1 to 9 any described area source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021605998A CN100437288C (en) | 2002-12-26 | 2002-12-26 | Area light sources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021605998A CN100437288C (en) | 2002-12-26 | 2002-12-26 | Area light sources |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1510484A CN1510484A (en) | 2004-07-07 |
| CN100437288C true CN100437288C (en) | 2008-11-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021605998A Expired - Fee Related CN100437288C (en) | 2002-12-26 | 2002-12-26 | Area light sources |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100437288C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI422880B (en) * | 2010-11-04 | 2014-01-11 | Wintek Corp | Light guide element and light source device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203025371U (en) * | 2011-05-19 | 2013-06-26 | 深圳市华星光电技术有限公司 | Light guide plate and backlight display module |
| CN102707372A (en) * | 2012-06-28 | 2012-10-03 | 苏州佳宏光电有限公司 | Novel light guide plate |
| CN105987325B (en) | 2015-03-02 | 2019-02-15 | 南京瀚宇彩欣科技有限责任公司 | Quantum pipe, backlight module and liquid crystal display device |
| CN108954038A (en) * | 2018-06-12 | 2018-12-07 | 北京交通大学 | Multi-functional chromatography area source |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1020109A (en) * | 1996-06-28 | 1998-01-23 | Casio Comput Co Ltd | Liquid crystal display device |
| CN2310926Y (en) * | 1997-09-26 | 1999-03-17 | 陈兴 | Area source device for LED |
| JP2001023420A (en) * | 1994-06-17 | 2001-01-26 | Nichia Chem Ind Ltd | Flat light source |
-
2002
- 2002-12-26 CN CNB021605998A patent/CN100437288C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001023420A (en) * | 1994-06-17 | 2001-01-26 | Nichia Chem Ind Ltd | Flat light source |
| JPH1020109A (en) * | 1996-06-28 | 1998-01-23 | Casio Comput Co Ltd | Liquid crystal display device |
| CN2310926Y (en) * | 1997-09-26 | 1999-03-17 | 陈兴 | Area source device for LED |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI422880B (en) * | 2010-11-04 | 2014-01-11 | Wintek Corp | Light guide element and light source device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1510484A (en) | 2004-07-07 |
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Granted publication date: 20081126 Termination date: 20171226 |