CN2607593Y - Poor light source - Google Patents
Poor light source Download PDFInfo
- Publication number
- CN2607593Y CN2607593Y CNU022505776U CN02250577U CN2607593Y CN 2607593 Y CN2607593 Y CN 2607593Y CN U022505776 U CNU022505776 U CN U022505776U CN 02250577 U CN02250577 U CN 02250577U CN 2607593 Y CN2607593 Y CN 2607593Y
- Authority
- CN
- China
- Prior art keywords
- light
- guide plate
- light guide
- backlight
- entrance face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The utility model relates to a background light source used for an LCD and consists of a plurality of spot light sources, a light guide plate and a plurality of light-scattering points. The light guide plate consists of a light incidence plane and a light outgoing plane intersected with the light incidence plane. The spot light sources are positioned at one side of the light incidence plane of the light guide plate. The light-scattering points are integrated or screen-printed on the light incidence plane of the light guide plate. Each spot light source is corresponded to a plurality of scattering points. The light-scattering points can be coupled with a Gaussian beam, which is emitted from the spot light source and has a divergence angle, into a beam which has an equally-distributed light intensity and is entered into the light guide plate.
Description
[technical field]
The utility model is about a kind of light supply apparatus, especially about a kind of Backlight For Liquid Crystal Display Panels that is applied to.
[background technology]
Present stage, LCD is fast because of its reaction time, 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.Yet liquid crystal itself is not luminous, must have a backlight 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 backlight glorious degrees must evenly distribute.Usually the light source in the backlight 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 backlight is also with regard to corresponding difference.
Please see Figure 1, a kind of commonly used be that the backlight 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 exiting surfaces with the pointolite.These a plurality of pointolites 13 are three light emitting diodes, evenly are spaced incidence surface 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 backlight 10, because the emergent light as the light emitting diode of pointolite 13 is the Gaussian beam (Gauss Beam) of the certain dispersion angle of tool, its output intensity changes along with the change of emergent light angle, light intensity reaches maximum value near the outgoing zero angle, zero angle both sides light intensity diminishes gradually, and pass through near the no light beam in zone outside the LED source angle 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 backlight 10 whole bright dipping luminance nonuniformities are even.
[utility model content]
The even defective of light guide plate bright dipping luminance nonuniformity when solving that backlight utilizes pointolite as light source in the background technology, the utility model provide a kind of backlight that light guide plate bright dipping briliancy is evenly distributed when utilizing pointolite as light source.
The technical scheme of the utility model technical solution problem provides a kind of backlight, and it comprises a plurality of pointolites, a light guide plate and a plurality of scattering point.This light guide plate comprises a light entrance face and one and the light-emitting face that intersects of light entrance face, these a plurality of pointolites are positioned light guide plate light entrance face one side, these a plurality of scattering points are set up the light entrance face that is positioned this light guide plate, and each pointolite is corresponding to several scattering points, and the Gaussian beam of the certain dispersion angle of tool of these several scattering point coupling respective point light source outgoing becomes the equally distributed light beam of light intensity to go into to inject this light guide plate.
The utility model backlight is provided with a plurality of scattering points between light guide plate light entrance face and pointolite, the non-light guide plate that directly enters of the emergent light of pointolite, enter light guide plate but earlier the Gaussian beam of outgoing is converted into the even distribution light beam of light intensity from light entrance face through a plurality of scattering points, and each pointolite is all corresponding to several scattering points on the light entrance face, these several scattering points effectively compensate for the not enough problem of the light intensity in dark space D, the E that may occur in the background technology, F, the G zone, and make light guide plate and backlight outgoing briliancy be evenly distributed.
[description of drawings]
Fig. 1 is the stereographic map of backlight in the background technology.
Fig. 2 is the schematic perspective view of the utility model backlight first embodiment.
Fig. 3 is the vertical view of backlight shown in Figure 2.
Fig. 4 is the vertical view of the utility model backlight second embodiment.
Fig. 5 is the diagrammatic cross-section of the utility model backlight the 3rd embodiment.
Fig. 6 is the diagrammatic cross-section of the utility model backlight the 4th embodiment.
[embodiment]
Please see Figure 2, it is first embodiment of the utility model backlight, this backlight 20 includes a plurality of light emitting diodes 21 and a light guide plate 22, a plurality of scattering points 23 are arranged between these a plurality of light emitting diodes 21 and the light guide plate 22, and the diverging light of these a plurality of light emitting diode 21 outgoing that are coupled is injected in the light guide plate 22.
Light guide plate 22 roughly becomes the dull and stereotyped entity of a rectangular parallelepiped, its include a light entrance face 221, with the vertical light-emitting face 222 of light entrance face 221, bottom surface 223, first side 224, and first side, 224 second side surface opposite 225 and three side 226 relative with the plane of incidence 221.For making light from light-emitting face 222 even outgoing; usually be provided with a plurality of sites (figure does not show) in this bottom surface 223; this site can variformly distribute; and for improving the light utilization ratio; in this bottom surface 223 and this each side 224,225 and 226 also be coated with reflectance coating usually or attach one deck reflecting plate (figure do not show) again; with reflection from light guide plate 22 bottom surfaces 223 or the side emergent light return light guide plate 22 and from light-emitting face 222 outgoing, 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.
Please see Fig. 3 in the lump, these a plurality of scattering points 23 are wire mark or the light entrance face 221 that is shaped in this light guide plate 22, and are outwards outstanding ball cross section body, certainly, these a plurality of scattering points 23 also can be the three-dimensional shape of the similar optical function of other tool, as right cylinder, four sides cylinder or Rotary-table etc.Per three scattering points are corresponding to a light emitting diode 21 in these a plurality of scattering points 23, and these three scattering point sizes are consistent, and corresponding with it light emitting diode 21 emergent lights of coupled in common are injected light guide plate 22 from light entrance face 221.
Please see Figure 4, it is the backlight 40 of the utility model second embodiment, backlight 20 compared to first embodiment, its difference is that three scattering points, the 43 volume size distribution and the light emitting diode 21 emergent ray intensity curves that wherein correspond respectively to a light emitting diode 21 distribute complementary, scattering point volume near corresponding light emitting diode 21 is less, and both sides are bigger away from the scattering point volume of corresponding light emitting diode 21.
Please see Figure 5, it is the backlight 30 of the utility model the 3rd embodiment, these backlight 30 basic structures are consistent with backlight 20, and difference is that wherein a plurality of scattering points 33 are a plurality of ball cross section body, right cylinder, four sides cylinder or Rotary-table shrinkage pools that cave inward from light guide plate 32 planes of incidence 321.These a plurality of shrinkage pools are the light entrance faces 321 that are shaped in light guide plate 32.Per three shrinkage pools are corresponding to a light emitting diode 31 in these a plurality of scattering points 33, and these three scattering point sizes are consistent, and corresponding with it light emitting diode 31 emergent lights of coupled in common are injected light guide plate 32 from light entrance face 321.
Please see Figure 6, it is the backlight 50 of the utility model the 4th embodiment, backlight 30 compared to the 3rd embodiment, its difference is that wherein these three shrinkage pools, 53 volume size distribution and light emitting diode 31 outgoing intensity curves that correspond respectively to a light emitting diode 31 distribute complementary, shrinkage pool volume near corresponding light emitting diode 31 is less, and both sides are bigger away from the shrinkage pool volume of corresponding light emitting diode 31.
In the utility model embodiment, in light guide plate 22,32 light entrance face 221,321 with light emitting diode 21, be provided with a plurality of scattering points 23 between 31,33, light emitting diode 21, the non-light guide plate 22 that directly enters of 31 emergent light, 32, but earlier through a plurality of scattering points 23,33 Gaussian beams with outgoing are converted into the even distribution light beam of light intensity from light entrance face 221,321 enter light guide plate 22,32, and each pointolite is all corresponding to three scattering points on the light entrance face, particularly second, in the 4th embodiment, scattering point body 23, proper and the light emitting diode 21 of 33 long-pending size distribution, the Gaussian distribution complementation of 31 smooth outgoing intensity, these three scattering points are for the dark space D that may occur in the background technology, E, F, the not enough problem of light intensity in the G zone effectively compensates, and makes light guide plate 22,32 outgoing briliancy are evenly distributed.
Certainly, also available other pointolite of light emitting diode substitutes in the utility model, 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; This scattering point number corresponding to the every bit light source can be a plurality of, and its big or small deploying also is not limited to above-mentioned distribution, can decide according to the light-emitting characteristic curve of difference light source.This backlight also can be in its at least one side further one-body molded or a plurality of scattering points of wire mark, and further be provided with a plurality of pointolites in side one side that light guide plate is provided with scattering point, consistent with first, second embodiment design, corresponding several scattering points of each pointolite, so, improving the light guide plate outgoing inhomogeneity while of briliancy, further improving the bright dipping briliancy of backlight.
Claims (10)
1. backlight, 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-emitting face that intersects of light entrance face, these a plurality of pointolites are positioned light guide plate light entrance face one side, it is characterized in that: this area source also includes the scattering point on the light entrance face that a plurality of settings are positioned this light guide plate, and each pointolite is corresponding to several scattering points, and the Gaussian beam of the certain dispersion angle of tool of these several scattering point coupling respective point light source outgoing becomes the equally distributed light beam of light intensity to go into to inject this light guide plate.
2. backlight as claimed in claim 1 is characterized in that these a plurality of scattering points are formed in one in outwards outstanding ball cross section body, right cylinder, four sides cylinder or the Rotary-table of this light entrance face.
3. backlight as claimed in claim 1 is characterized in that these a plurality of scattering points are outwards outstanding ball cross section body, right cylinder, four sides cylinder or the Rotary-table of wire mark in this light entrance face.
4. as claim 2 or 3 described backlights, it is characterized in that these a plurality of scattering point sizes are consistent.
5. as claim 2 or 3 described backlights, the volume size distribution and the pointolite outgoing intensity curve that it is characterized in that several scattering points that this corresponds respectively to the same point light source distribute complementary, scattering point volume near the respective point light source is less, and both sides are bigger away from the scattering point volume of respective point light source.
6. as claim 1,2 or 3 described backlights, it is characterized in that this light guide plate further comprises vertical with light entrance face or acutangulates crossing bottom surface, this bottom surface is provided with a plurality of sites.
7. backlight as claimed in claim 6, it comprises that further one reflects the reflecting plate that returns light guide plate from light guide plate bottom surface emergent light.
8. backlight as claimed in claim 6, this bottom surface further is coated with a reflectance coating.
9. as claim 1,2 or 3 described backlights, it is characterized in that this light guide plate further comprises another light entrance face, one-body molded or wire mark has a plurality of scattering points on it, and each pointolite correspondence is provided with several scattering points.
10. as claim 1,2 or 3 described backlights, it is characterized in that these a plurality of pointolites are light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU022505776U CN2607593Y (en) | 2002-12-20 | 2002-12-20 | Poor light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU022505776U CN2607593Y (en) | 2002-12-20 | 2002-12-20 | Poor light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2607593Y true CN2607593Y (en) | 2004-03-24 |
Family
ID=34149538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU022505776U Expired - Lifetime CN2607593Y (en) | 2002-12-20 | 2002-12-20 | Poor light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2607593Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395634C (en) * | 2004-08-07 | 2008-06-18 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN101566757B (en) * | 2008-04-23 | 2011-08-31 | 群康科技(深圳)有限公司 | Backlight module and liquid crystal display device |
| CN102236123A (en) * | 2011-07-04 | 2011-11-09 | 林胜军 | Light guide structure with multiple three-dimensional incident faces |
| US8107034B2 (en) | 2008-04-03 | 2012-01-31 | Chimei Innolux Corporation | Backlight module with light concentrating and scattering structure and liquid crystal display using same |
| CN101685602B (en) * | 2008-09-27 | 2012-02-01 | 佛山市顺德区汉达精密电子科技有限公司 | Display device with backlight local optical-projection control circuit |
| WO2013143162A1 (en) * | 2012-03-29 | 2013-10-03 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
-
2002
- 2002-12-20 CN CNU022505776U patent/CN2607593Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395634C (en) * | 2004-08-07 | 2008-06-18 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| US8107034B2 (en) | 2008-04-03 | 2012-01-31 | Chimei Innolux Corporation | Backlight module with light concentrating and scattering structure and liquid crystal display using same |
| CN101566757B (en) * | 2008-04-23 | 2011-08-31 | 群康科技(深圳)有限公司 | Backlight module and liquid crystal display device |
| CN101685602B (en) * | 2008-09-27 | 2012-02-01 | 佛山市顺德区汉达精密电子科技有限公司 | Display device with backlight local optical-projection control circuit |
| CN102236123A (en) * | 2011-07-04 | 2011-11-09 | 林胜军 | Light guide structure with multiple three-dimensional incident faces |
| WO2013143162A1 (en) * | 2012-03-29 | 2013-10-03 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
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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: 20121220 Granted publication date: 20040324 |