CN100395633C - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN100395633C CN100395633C CNB200310111838XA CN200310111838A CN100395633C CN 100395633 C CN100395633 C CN 100395633C CN B200310111838X A CNB200310111838X A CN B200310111838XA CN 200310111838 A CN200310111838 A CN 200310111838A CN 100395633 C CN100395633 C CN 100395633C
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- guide plate
- area
- light guide
- light
- grating
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Abstract
The present invention relates to a back light module. The back light module of the present invention comprises a light source and a light guide plate, wherein the light guide plate comprises a light emergent surface, a bottom surface and at least one light incident surface, the light emergent surface is opposite to the bottom surface, the light incident surface is connected with the light emergent surface and the bottom surface, the light emergent surface is provided with a plurality of transmission type diffraction grating units, each diffraction grating unit comprises two zones which are vertically arranged, the grating arrangement direction of a first zone is perpendicular to the direction of a connecting line between a nearest luminous point and the point, and the grating arrangement direction of a second zone is perpendicular to the grating arrangement direction of the first zone.
Description
[technical field]
The invention relates to a kind of module backlight, particularly have the module backlight of optical grating construction light guide plate about a kind of use.
[background technology]
Module backlight in the prior art LCD 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.A plurality of sites that distribute, the bottom surface of this light guide plate are in order to the light beam of dispersion light-guiding board internal transmission, to improve the homogeneity of light guide plate outgoing beam.For further improving the light guide plate outgoing light homogeneity, recently, the diffraction grating technology is used to light guide plate to improve the light guide plate outgoing light homogeneity.
On Dec 30th, 1997, the United States Patent (USP) of bulletin disclosed a kind of module backlight that adopts the diffraction grating technology for the 5th, 703, No. 667.See also Fig. 1, this module 1 backlight comprises that the reflecting plate 5, of fluorescent lamp 4, the one contiguous light guide plate 2 bottom surface 2b setting that a light guide plate 2, one contiguous light guide plate 2 incidence surface 2c are provided with is arranged at the diffuser plate 6 and the prism plate 7 of light guide plate 2 exiting surface 2a one side.2b has a plurality of grating regions 3 at this 2 end of light guide plate, this grating orientation is single and be parallel to fluorescent lamp 4, and grating region 3 and non-grating region 3 in the unit length ' ratio along changing away from fluorescent lamp 4 directions, by diffraction grating structure the diffraction effect of light beam is improved this light guide plate 2 outgoing light homogeneity.Yet this patented technology exists not enough.
At first, these light guide plate 2 exiting surface 2a brightness are lower, reason is that the grating of this grating region 3 is single arrangement architecture, it is mainly to the light beam generation diffraction of incident direction perpendicular to the grating orientation, then almost can not produce diffraction to the light beam that is parallel to the grating orientation, therefore the light source utilization factor is lower, and exiting surface 2a brightness is also lower.
Secondly, 2 bottom surface 2b are to light diffraction efficiency deficiency for this light guide plate, and promptly the grating region 3 of light guide plate 2 bottom surface 2b is not a continuous distribution, and non-grating region 3 ' can not make the light generation diffraction of incident causes the outgoing light homogeneity of light guide plate exiting surface 2a to be affected.
[summary of the invention]
Die set light source utilization factor backlight is low in order to solve, the problem of outgoing light homogeneity difference, the invention provides the module backlight that a kind of bright dipping is even and light utilization is high.
The technical scheme that technical solution problem of the present invention is adopted is: a kind of module backlight is provided, it comprises a light source and a light guide plate, this light guide plate comprises an exiting surface, one bottom surface and at least one incidence surface, wherein this exiting surface and bottom surface are oppositely arranged, this incidence surface and exiting surface and bottom surface join, and exiting surface is provided with a plurality of continuous distribution and covers the transmission-type diffraction grating unit of whole exiting surface, each diffraction grating unit comprises two zones that orientation is perpendicular, wherein grating orientation in first area is perpendicular to the luminous point and the direction of line recently herein, and the orientation of second area grating is perpendicular to first area grating orientation.
Above-mentioned bottom surface of light guide plate further applies a fluorescent coating.
Compared with prior art, a plurality of transmission-type diffraction grating unit of light guide plate exiting surface in the present invention's module backlight is because orthogonal two grating regions of tool orientation, this two grating region can make the incident light generation diffraction of different directions, so light guide plate luminance is higher; The fluorescent coating of this bottom surface of light guide plate is to the amplification of light beam wavelength, make that the angle of diffraction behind the diffraction is bigger, and diffraction element continuous distribution and cover whole exiting surface, can make light guide plate exiting surface brightness unanimity everywhere promptly has sufficiently high outgoing light homogeneity.
[description of drawings]
Fig. 1 is the synoptic diagram of prior art module backlight.
Fig. 2 is the structural representation of the present invention's module first embodiment backlight.
Fig. 3 is the vertical view of the present invention's module first embodiment backlight.
Fig. 4 is the structural representation of the present invention's module second embodiment backlight.
Fig. 5 is the vertical view of the present invention's module second embodiment backlight.
[embodiment]
See also Fig. 2 and Fig. 3, first embodiment of the invention module 10 backlight comprises a line source 11, a light guide plate 12 and a reflector plate 13.Wherein, this line source 11 is a cold cathode fluorescent lamp (Cold Cathode Fluorecent Lamp, CCFL), this light guide plate 12 comprise an exiting surface 123 that a plurality of transmission-type raster units 125 are set, one and this exiting surface 123 be oppositely arranged, and the incidence surface 121 that joins of the bottom surface 122, with a plurality of sites 124 and fluorescent coating (figure does not show) and this exiting surface 123 and this bottom surface 122.These line source 11 contiguous these light guide plate 12 incidence surfaces 121 are provided with, and the bottom surface 122 of reflector plate 13 relative light guide plate 12 is provided with.
This light guide plate 12 is tabular, makes with transparent material such as acryl resin, polycarbonate, polyvinyl resin or glass etc., and different, it is closeer away from light source according to the distance of distance line source 11 for site 124 sizes of its bottom surface 122 and density.These a plurality of sites 124 can be lenticule shape, cylindric, cube or spherical etc.The fluorescent coating that this bottom surface 122 applies adopts fluorescent material to make, and also can adopt phosphor material or alkaline earth aluminate material etc.This coating can be elongated with the wavelength that passes through light beam wherein.A plurality of transmission-type raster units 125 (as shown in phantom in Figure 3) are set on the exiting surface 123 of this light guide plate 12, these a plurality of raster units 125 cover the exiting surface 123 of whole light guide plate 12, adopt die casting technology and this light guide plate 12 one-body molded, to a series of manufacture of semiconductor such as the making employing el of the pattern on die surface that should diffraction grating unit 125, electroforming.Each diffraction grating unit 125 comprises orthogonal two zones of grating orientation, i.e. first area a and second area A, and first area a is positioned at a jiao of each diffraction grating unit 125.Wherein the orientation of first area a grating is perpendicular to the light beam incident direction, and the orientation of second area A grating is perpendicular to first area a grating orientation.
See also Fig. 3, the grating orientation of raster unit 125 is described.The characteristics of luminescence according to line source 11, suitable substantially with the luminous intensity of the equidistant each point of line source 11, therefore the grating orientation of the first area a of each raster unit 125 all is set to parallel with incidence surface 121, and the grating orientation of second area A all is set to incidence surface 121 perpendicular, and a little less than more healing away from line source 11 luminous intensities, so playing the area of the first area a of bigger effect, the light beam of vertical raster orientation incident increases gradually, i.e. the area S of first area a
aArea S with second area A
ARatio along laterally gradually changing, if along laterally light guide plate being divided into isometric four sections area I, II, III, IV, then its ratio range can be followed successively by 0.01～0.1,0.1～0.2,0.2～0.3,0.3～0.4.The grating cross section of this diffraction grating unit 125 is rectangles, and its grating constant is 2～10 μ m, preferably 3 μ m.
In this module 10 backlight, go into to inject light guide plate 12 from the light beam that line source 11 sends from light guide plate 12 incidence surfaces 121, segment beam is directive exiting surface 123 after 124 scatterings of a plurality of sites of bottom surface 122, and another part light beam through the bottom surface 122 the fluorescent coating and the plate 13 reflected back light guide plate 12 that are reflected, because the effect of fluorescent coating, the wavelength of this segment beam is elongated, in more than 123 transmission-type diffraction grating of exiting surface unit 125 places part generation diffraction effect, from exiting surface 123 outgoing; Incident exiting surface 123 segment beams are owing to incident angle continues to the direction reflections propagate away from light source less than the cirtical angle of total reflection, until from exiting surface 123 outgoing.Because this diffraction grating unit 125 has two different zones of grating orientation, this two grating region can make the incident light generation diffraction of different directions, so these module 10 light utilizations backlight are higher, brightness is higher; And the bottom surface 122 of light guide plate 12 has the fluorescent coating, the light beam wavelength that passes this fluorescent coating is elongated, it is bigger in the angle of diffraction that diffraction effect takes place exiting surface 123, reach these diffraction grating unit 125 continuous distribution and cover whole exiting surface 123, make and higher outgoing light homogeneity is promptly arranged light guide plate exiting surface 123 brightness unanimities everywhere.
Seeing also Fig. 4 and Fig. 5, is second embodiment structural representation and the vertical view of the present invention's module backlight.This module 20 backlight comprises two pointolites, 21, one light guide plate 22 and a reflector plate 23.Wherein this pointolite is light emitting diode (Light Emitting Diode, LED), this light guide plate 22 comprise an exiting surface 223 that a plurality of transmission-type raster units 225 are set, one and this exiting surface 223 be oppositely arranged and have the incidence surface 221 that the bottom surface 222, of a plurality of sites 224 and fluorescent coating (figure does not show) joins with this exiting surface 223 and this bottom surface 222.Be provided with in the middle of these two pointolites, 21 contiguous these light guide plate 22 incidence surfaces 221, the bottom surface 222 of reflector plate 23 relative light guide plate 22 is provided with.
This light guide plate 22 is wedge shape, and different, it is closeer away from light source according to the distance of distance light source for the size of a plurality of sites 224 of its bottom surface 222 and density.Being arranged on the fluorescent coating of bottom surface 222, is to adopt fluorescent material to make, and also can adopt phosphor material or alkaline earth aluminate material.A plurality of transmission-type raster units 225 of the exiting surface 223 of this light guide plate 22 cover the exiting surface 223 of whole light guide plate 22, are one-body molded with this light guide plate 22.Each diffraction grating unit 225 comprises orthogonal two zones of grating orientation, be first area a and second area A, first area a is positioned at a jiao of each diffraction grating unit 225, wherein the orientation of first area a grating is perpendicular to the light beam incident direction, and second area A orientation is perpendicular to first area a grating orientation.
See also Fig. 5, the grating orientation of raster unit 225 is described.The characteristics of luminescence that has certain dispersion angle according to pointolite 21, the area part of basic vertical incidence light guide plate 22 incidence surfaces 221 of corresponding point light source 21 light beams then, two zones of diffraction grating unit are arranged the second area A that the first area a be parallel to incidence surface 221 and grating arrange perpendicular to incidence surface 221 by grating and are formed, and get over point of distance light source 21, the area of first area a that can play big diffraction to the incident beam of relative vertical raster orientation is big more, and be positioned at the area part of light beam oblique incidence light guide plate 22 incidence surfaces 221 of pointolite 21, two orthogonal oblique raster arrangement modes are adopted in two zones of unit, diffraction light station, be the beam direction of the grating arragement direction of first area a perpendicular to oblique incidence incidence surface 221, the grating arragement direction of second area A is then perpendicular to the grating arragement direction of first area a, and get over point of distance light source 21, the area of first area a is big more.If along laterally light guide plate being divided into isometric four sections area I, II, III, IV, then its ratio range can be followed successively by 0.01～0.1,0.1～0.2,0.2～0.3,0.3～0.4.The grating cross section of this diffraction grating unit 225 is a rectangle, and its grating constant is 2～10 μ m, preferably 3 μ m.Certainly, the grating orientation also can have different designs according to pointolite present position difference and number difference in this diffraction grating unit 225.
This module 20 backlight can be reached higher outgoing light homogeneity and brightness as module 10 backlight.For making outgoing light homogeneity better, can change the grating orientation of the second area A of each diffraction grating unit 225 along point of distance light source 21, the grating orientation of point of distance light source 21 second area A is more tilted more, more near light source and line direction herein.Also can a plurality of reflection-type diffraction gratings unit be set in light guide plate 22 bottom surfaces 222.
In addition, this module 10,20 backlight also has other change design, as changes the grating constant of each diffraction grating unit 125,225, thereby the diffraction efficiency that changes each diffraction grating unit 125,225 is to improve outgoing light homogeneity; Changing grating constant makes it more little away from light source 11,21 more; Change the position of the first area a in the diffraction grating unit 125,225, make the center that is positioned at each diffraction grating unit 125,225; The grating cross section that changes diffraction grating unit 125,225 is the orthogonal square or rectangle that contains oblique line, and its grating constant is 2～10 μ m, preferably 3 μ m.
Claims (10)
1. module backlight, it comprises a light source and a light guide plate, this light guide plate comprises an exiting surface, one bottom surface and at least one incidence surface, wherein this exiting surface and bottom surface are oppositely arranged, this incidence surface joins with this exiting surface and bottom surface, it is characterized in that: this exiting surface is provided with a plurality of continuous distribution and covers the transmission-type diffraction grating unit of whole exiting surface, each diffraction grating unit comprises two zones that orientation is perpendicular, wherein grating orientation in first area is perpendicular to the luminous point and the direction of line recently herein, and the second area orientation is perpendicular to first area grating orientation.
2. module backlight as claimed in claim 1 is characterized in that: this bottom surface of light guide plate is provided with a plurality of sites, and this site is big more close more away from light source more.
3. module backlight as claimed in claim 1 is characterized in that: this bottom surface of light guide plate applies a fluorescent coating.
4. module backlight as claimed in claim 3 is characterized in that: this fluorescent coating is to adopt fluorescent, phosphorescence or alkaline earth aluminate material to make.
5. module backlight as claimed in claim 1 is characterized in that: the area of this first area is big more away from light source more.
6. module backlight as claimed in claim 1 is characterized in that: the grating constant of this first area is more little away from light source more.
7. module backlight as claimed in claim 1 is characterized in that: the first area in this diffraction grating unit is positioned at a jiao of each diffraction grating unit.
8. module backlight as claimed in claim 1 is characterized in that: the first area in this diffraction grating unit is positioned at the center of each diffraction grating unit.
9. module backlight as claimed in claim 1 is characterized in that: the grating cross section of this diffraction grating unit is a rectangle.
10. module backlight as claimed in claim 1 is characterized in that: this bottom surface of light guide plate further is provided with a plurality of reflection-type diffraction gratings unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310111838XA CN100395633C (en) | 2003-10-16 | 2003-10-16 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310111838XA CN100395633C (en) | 2003-10-16 | 2003-10-16 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1607435A CN1607435A (en) | 2005-04-20 |
| CN100395633C true CN100395633C (en) | 2008-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200310111838XA Expired - Fee Related CN100395633C (en) | 2003-10-16 | 2003-10-16 | Backlight module |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1932602A (en) | 2005-09-14 | 2007-03-21 | 鸿富锦精密工业（深圳）有限公司 | Light-conducting plate |
| WO2008053078A1 (en) * | 2006-10-31 | 2008-05-08 | Oy Modines Ltd. | Light outcoupling structure for a lighting device |
| CN102608798B (en) * | 2011-01-21 | 2016-04-20 | 群创光电股份有限公司 | Liquid crystal panel module, backlight module and liquid crystal indicator |
| TWI476483B (en) * | 2011-03-31 | 2015-03-11 | Chi Mei Materials Technology Corp | Display apparatus and a liquid crystal display device |
| TWI477823B (en) * | 2012-05-28 | 2015-03-21 | E Ink Holdings Inc | Light guide and electrophoretic display apparatus switchable between black-white mode and color mode |
| CN103454714B (en) | 2012-05-28 | 2016-08-24 | 元太科技工业股份有限公司 | Light guide plate and electrophoretic display device capable of switching between color mode and black-and-white mode |
| DE102013220190B4 (en) * | 2013-10-07 | 2021-08-12 | Dr. Johannes Heidenhain Gmbh | Measuring graduation and photoelectric position measuring device with this measuring graduation |
| CN103565396A (en) * | 2013-11-11 | 2014-02-12 | 苏州卫生职业技术学院 | Visual chart light box with light guide plate of submicrometer structure |
| TWI599801B (en) * | 2016-07-26 | 2017-09-21 | Au Optronics Corp | Image sensing device and optical film thereof |
| CA3035801C (en) * | 2016-10-05 | 2021-01-12 | Leia Inc. | Polarized backlight and backlit display using the same |
| CN107238974B (en) | 2017-07-24 | 2021-03-02 | 京东方科技集团股份有限公司 | Backlight source and liquid crystal display module |
| CN108050439B (en) * | 2018-01-03 | 2020-02-28 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN109709723A (en) * | 2019-03-15 | 2019-05-03 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and display panel |
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| JPH08297204A (en) * | 1995-04-26 | 1996-11-12 | Dainippon Printing Co Ltd | Color filter and color liquid crystal display device |
| JPH09311212A (en) * | 1996-05-21 | 1997-12-02 | Kawaden Kogyo Kk | Color filter for matrix display device |
| JPH10332916A (en) * | 1997-05-30 | 1998-12-18 | Toppan Printing Co Ltd | Diffraction grating pattern |
| CN2310926Y (en) * | 1997-09-26 | 1999-03-17 | 陈兴 | Area source device for LED |
| JP2000266914A (en) * | 1999-03-12 | 2000-09-29 | Toppan Printing Co Ltd | Light diffuser and display device using it |
| JP2001183529A (en) * | 1999-12-22 | 2001-07-06 | Victor Co Of Japan Ltd | Master hologram |
| CN1352786A (en) * | 1999-05-28 | 2002-06-05 | 智能控制系统有限公司 | Light indicator |
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2003
- 2003-10-16 CN CNB200310111838XA patent/CN100395633C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08297204A (en) * | 1995-04-26 | 1996-11-12 | Dainippon Printing Co Ltd | Color filter and color liquid crystal display device |
| JPH09311212A (en) * | 1996-05-21 | 1997-12-02 | Kawaden Kogyo Kk | Color filter for matrix display device |
| JPH10332916A (en) * | 1997-05-30 | 1998-12-18 | Toppan Printing Co Ltd | Diffraction grating pattern |
| CN2310926Y (en) * | 1997-09-26 | 1999-03-17 | 陈兴 | Area source device for LED |
| JP2000266914A (en) * | 1999-03-12 | 2000-09-29 | Toppan Printing Co Ltd | Light diffuser and display device using it |
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| JP2001183529A (en) * | 1999-12-22 | 2001-07-06 | Victor Co Of Japan Ltd | Master hologram |
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| Publication number | Publication date |
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| CN1607435A (en) | 2005-04-20 |
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