CN101676771B - Optical system for splitting colors and display unit using same - Google Patents
Optical system for splitting colors and display unit using same Download PDFInfo
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- CN101676771B CN101676771B CN2008102129789A CN200810212978A CN101676771B CN 101676771 B CN101676771 B CN 101676771B CN 2008102129789 A CN2008102129789 A CN 2008102129789A CN 200810212978 A CN200810212978 A CN 200810212978A CN 101676771 B CN101676771 B CN 101676771B
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Abstract
The invention provides an optical system for splitting colors and a display unit using the optical system. The optical system receives incident light traveling from a side edge, so as to split the incident light into various colored light; the optical system comprises a light-guide plate, so that the inner total reflection of the incident light can be generated in a reciprocal manner inside the light-guide plate; a plurality of micro-structures are arranged on the surface of the light-guide plate and capable of breaking down the inner total reflection, so that the light exits.
Description
Technical field
The present invention relates to the optical color light splitting technology, can be provided in image demonstration or when picked-up needed color light source.
Background technology
The color of image generally is by a plurality of primary colors (Primary Color) light and divides other primitive color light shade of gray variation to constitute.That primitive color light is general the most frequently used for example is red (R), green (G), blue (B).
In flat-panel screens, backlight is often arranged in pairs or groups liquid crystal spatial modulator (spatial light modulator) and colored filter to present full-colorization image.And the image sensor in digital camera, the calculation that also needs colored filter accompanying colour difference is to present the color of the original.In relatively large system, then adopt three-plate type or double-plate prism group or colored filter collocation collimated light source to present the full color image as colour camera and back projection TV.When system adopts colored filter (color filter, CF) time,, there is 2/3rds incident white light energy to be absorbed approximately because of each colored pixels of colored filter can only present the wherein single primary colors of red green blue tricolor (RGB), reduce the optics service efficiency, also reduce battery serviceable life.The technology of colored filter itself is loaded down with trivial details in addition, and each primary colors need use above together semiconductor gold-tinted technology, cost height at least.
At conventional art, therefore the fabricator of correlation technique or deviser propose to utilize optical mode to reach the effect of beam split, the RGB primaries are isolated, to avoid adopting colored filter.
With the content of United States Patent (USP) U5615024A, it discloses a kind of optical texture of alternative colored filter, mainly is to utilize the formula grating (Blazed Grating) that glitters to produce three primary colors to separate.When being applied to panel, each primary colors can a corresponding pixel (mainly being that one-level penetrates diffraction light).Owing to use one-level to penetrate the event of diffraction light, incident light and emergent light folder wide-angle vertically enter liquid crystal layer for making emergent light, and incident light must wide-angle enter the grating that declines that glitters.If enter the grating that declines that glitters with vertical incidence light, emergent light can only wide-angle enter liquid crystal layer, will limit workability.
Except above-mentioned conventional art, still also have other multiple different designs based on optical element.Yet the optical texture of the colored filter of conventional art still has its other relative merits.Light splitting technology based on optical element still continues in research and development, to reach better usefulness.
Summary of the invention
The present invention proposes to replace with optical element module the beam-splitting structure of colored filter, keeping under the situation of optical efficiency, for example can produce primaries, and it is incident in liquid crystal layer corresponding to panel pixel and subvertical direction.
The invention provides a kind of optical system for splitting colors, receive incident light by side incident to isolate a plurality of color light.This system comprises base plate, first light guide plate, second light guide plate and the 3rd light guide plate.First light guide plate has first surface and second surface, a plurality of microstructures are arranged on the second surface, and first surface is arranged on the base plate.Incident light comes back reflective between first surface and second surface, wherein Yi Bufen this incident light penetrates in these microstructures, produces to penetrate light.Second light guide plate has the plane of incidence and optical grating construction face, be arranged on first light guide plate, and the plane of incidence receives and to penetrate light, and isolate these color light by the optical grating construction face.The 3rd light guide plate is arranged on second light guide plate, and wherein the exiting surface of the 3rd light guide plate has a plurality of protrusion deviation structures, with these color light deviations to predetermined direction.
According to the embodiment of the invention, for example first light guide plate, second light guide plate and the 3rd light guide plate are tight rhythmo structure in described optical system for splitting colors.
According to the embodiment of the invention, for example comprise also that in described optical system for splitting colors micro-lens sheet is arranged on the 3rd light guide plate, to assemble these color light to the precalculated position.
According to the embodiment of the invention, for example first light guide plate, second light guide plate, the 3rd light guide plate and micro-lens sheet are tight rhythmo structure in described optical system for splitting colors.
According to the embodiment of the invention, for example the first surface of first light guide plate and second surface are to be parallel to each other in described optical system for splitting colors.
According to the embodiment of the invention, for example base plate is reflection horizon or optical material layer in described optical system for splitting colors, and itself and first light guide plate constitute inner total reflection.
According to the embodiment of the invention, the interface of first light guide plate and second light guide plate for example in described optical system for splitting colors except these microstructures, constitutes inner total reflection face.
According to the embodiment of the invention, for example second light guide plate is single structure layer or composite construction layer in described optical system for splitting colors.
According to the embodiment of the invention, for example each this protrusion deviation structure of the 3rd light guide plate has first inclined-plane in described optical system for splitting colors, second inclined-plane, and refraction coefficient constitutes valley structure makes these color light from this first inclined-plane outgoing and reflect in this second inclined-plane again.
According to the embodiment of the invention, for example base plate, first light guide plate, second light guide plate and the 3rd light guide plate are bar elements in described optical system for splitting colors.
According to the embodiment of the invention, for example base plate, first light guide plate, second light guide plate and the 3rd light guide plate constitute light-emitting area in described optical system for splitting colors.
According to the embodiment of the invention, for example base plate, first light guide plate, second light guide plate and the 3rd light guide plate are planar unit in described optical system for splitting colors, wherein the microstructure of first light guide plate is a plurality of list structures, is parallel to each other and extends in same direction.
According to the embodiment of the invention, for example base plate, first light guide plate, second light guide plate and the 3rd light guide plate are planar unit in described optical system for splitting colors, and wherein the microstructure of first light guide plate is concentric a plurality of around list structure.
According to the embodiment of the invention, for example the refraction coefficient of first light guide plate, second light guide plate and the 3rd light guide plate is respectively n1, n2 and n3 in described optical system for splitting colors, determines the critical angle of inner total reflection by the size of n1, n2 and n3.
According to the embodiment of the invention, for example each this microstructure of first light guide plate has the inclined-plane in described optical system for splitting colors, destroys inner total reflection, allows this incident light to shine this second light guide plate.
According to the embodiment of the invention, in described optical system for splitting colors, for example also comprise the 4th light guide plate between first light guide plate and second light guide plate.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate institute's accompanying drawing, be described in detail below.
Description of drawings
Fig. 1 illustrates according to the present invention, and optical system for splitting colors is applied to the diagrammatic cross-section of liquid crystal display systems.
Fig. 2 illustrates according to the embodiment of the invention, and optical system for splitting colors is applied to the diagrammatic cross-section of liquid crystal display systems.
Fig. 3 illustrates according to the embodiment of the invention, the mechanism of action synoptic diagram of the microstructure 202a of light guide plate 202.
Fig. 4 illustrates according to the embodiment of the invention, the mechanism of action synoptic diagram of the protrusion deviation structure 208a in Fig. 2.
Fig. 5 illustrates according to the embodiment of the invention, and optical system for splitting colors is applied to the diagrammatic cross-section of liquid crystal display systems.
Fig. 6 illustrates according to the embodiment of the invention, the section volume rendering synoptic diagram of planar optical system for splitting colors.
Fig. 7 (a) illustrates according to the embodiment of the invention to 7 (f), the variation synoptic diagram of the microstructure of light guide plate.
Description of reference numerals
100: optically focused micro-lens sheet 102: double-layer grating structure sheet
102a, 102b: optical grating construction 104: display panels
106: inferior pixel 108: white light
200,250: base plate 202: light guide plate
202a: microstructure 204: light guide plate
206: lenticular lenses 206a: the optical grating construction face
208: light guide plate 208a: protrude the deviation structure
210,210 ': concentration piece 212: image display panel
212a: pixel 214: incident light
216: emergent light 500: light source
502: leaded light optical element 504: light guide plate
504a: microstructure 506: light 508: area source
Embodiment
In the present invention, optics mechanism generally for example is to utilize periodic polygonal optical to constitute grating with structure, and wherein grating more for example is the formula grating that glitters, and has the grating of branch light wave effect and diffraction efficiency concurrently.By the incident light of adjustment grating and the relative angle on grating inclined-plane, make that the refractive direction of diffraction direction of light when being plane of refraction with grating facet (Facet) is identical, this moment, diffraction optics efficient can reach optimum condition in diffraction direction (or refractive direction of Facet).
Generally speaking, in order to reach the spectrophotometric result of good optical band, the light beam of incident grating has preferred effect in the mode of height collimation.The present invention proposes beam-splitting structure and has optical grating construction, for example can produce high collimated backlight.System for splitting colors of the present invention for example contains the optical layers of specific refractive index and microstructure and the blooming piece of three layers of periodic polygonized structure in conjunction with three layers.In addition, the present invention more allows to adopt the incident light of polarization, and when making it be applied to panel or optical-mechanical system, the service efficiency of light can promote more.
Below propose some embodiment as description of the invention, but the present invention is not limited and illustrated embodiment, and institute is for also can suitable mutually combination between a plurality of embodiment.Again, following description of the invention is to be that example is described with the RGB primitive color light, and with regard to wavelength, primitive color light of the present invention is not limited in the wave band of RGB.
Fig. 1 illustrates according to the present invention, and optical system for splitting colors is applied to the diagrammatic cross-section of liquid crystal display systems.Consult Fig. 1, the present invention proposes to reach separate primary color light by the grating of optical element, and further is applied on the liquid crystal display systems.Optically focused micro-lens sheet 100 receives white light 108, and white light 108 is assembled.Lenticule on the optically focused micro-lens sheet 100 is corresponding preposition setting, for example is the position of respective pixel and being provided with.White light 108 after the gathering is isolated white light 108 by double-layer grating structure sheet 102 primaries of RGB.Optical grating construction sheet 102 for example has double-deck optical grating construction 102a, 102b.Based on grating optical diffraction phenomenon, the white light 108 after the gathering can be according to the different primaries that isolate R, G, B of the wavelength of RGB after by optical grating construction 102a.The direct of travel of the primaries of this R that is separated, G, B has deviation, and it is rotated back into R, the G of these separation, the primaries of B near the exit direction perpendicular to optical grating construction sheet 102 by the optical grating construction 102b of another side again.Then, the light of optical grating construction sheet 102 outgoing can enter the inferior pixel 106 on the display panels 104.Three pixel 106 corresponding R, G, B show that shade of gray constitutes pixel.
In the structure of Fig. 1,, for example need long path with regard to whole component thickness.In addition, based on the basic structure design of Fig. 1, the present invention proposes some embodiment more in addition.Fig. 2 illustrates according to the embodiment of the invention, and optical system for splitting colors is applied to the diagrammatic cross-section of liquid crystal display systems.Consult Fig. 2, the structure that optical system for splitting colors is basic for example comprises base plate 200, light guide plate 202, light guide plate 204/206 and light guide plate 208.Base plate 200 for example can be optical material or the reflector plate with refraction coefficient n0, and its effect is the effect that produces reflection, and it can be described in the back.Light guide plate 202 has two surfaces, and a plurality of microstructure 202a are arranged on one of them surface, and another surface then is arranged on the base plate 200.Microstructure 202a has the region geometry shape, incides this regional incident angle in order to change light, to destroy the phenomenon of inner total reflection, allows this regional light to penetrate.The geometric configuration of the microstructure 202a for example geometric configuration on section is the triangle of evagination, and the angle change incident angle by its inclined-plane allows this regional light for example to penetrate in the refraction mode.Yet the geometric configuration of microstructure 202a is not limited to the outer male structure of being lifted.In other words, microstructure 202a for example also has been the structure of indent.Microstructure 202a has an exiting surface at least, changes the phenomenon of inner total reflection the phenomenon of refraction into, and light is penetrated.The effect meeting of microstructure 202a continues in the back to describe.
The refraction coefficient of first light guide plate 202 is n1.Incident light 214 comes back reflective between two surfaces of first light guide plate 202, for example be the inner total reflection phenomenon of optics.For example, the light guide plate 204 with refraction coefficient n2 is arranged on the light guide plate 202, makes refraction coefficient n1 less than light guide plate 202 by selective refraction coefficient n2, can produce inner total reflection.For example, incident light 214 is from the side of light guide plate 202, and with predetermined angle incident, then light can come back reflective, is directed to another side in light guide plate 202.200 normal direction N are reference direction with base plate, for example incide base plate 200 with 62 ° incident light at incidence point 214a, and are reflected to incidence point 214b.With regard to the incident beam of practical operation, incident angle has the scope that departs from several years, and for example 2 degree departs from scope.Incident light is reflected to incidence point 214c from incidence point 214b again.As described above, be distributed with a plurality of microstructure 202a on the light guide plate 202.At this example, inner total reflection is to incidence point 214d again from incidence point 214c meeting quilt for light 214, and it drops on the inclined-plane of microstructure 202a.The inclined-plane of microstructure 202a changes incident angle, and then changes into the refraction penetration phenomenon from the inner total reflection phenomenon.Can penetrate when therefore the incident light of a part is incident on microstructure 202a, produce and penetrate light.
Fig. 3 illustrates according to the embodiment of the invention, the mechanism of action synoptic diagram of the microstructure 202a of light guide plate 202.Consult Fig. 3 earlier, on the exiting surface of light guide plate 202, increase microstructure 202a.The section shape of microstructure 202a for example is the triangle that protrudes, and wherein the oblique angle on inclined-plane is a reference direction with the horizontal direction of light guide plate 202, for example is to depart from 2 degree, and wherein the N direction is the vertical direction of whole light guide plate 202.Relatively the N direction for example has the incident lights of 62 degree, can produce inner total reflection when being incident in the flat site of light guide plate 202.Yet, when being incident in the microstructure 202a inclined-plane of light guide plate 202, because the inclined-plane departs from 2 degree, cause the phenomenon of inner total reflection to disappear, and change into refraction effect, and its most light can penetrate, and the light of fraction still can reflect, continuation is advanced in light guide plate 202 with same mechanism, penetrates once again on other microstructure 202a that are fit to.After choosing suitable refraction coefficient, for example its part that penetrates of incident light of 62 degree can be for example with the 84.2 angle outgoing of spending.Unpolarized light beam allows an angular range.Fig. 3 only illustrates to describe the mechanism that inner total reflection is converted to the refraction penetration phenomenon.
Then, the effect of light guide plate 204 is by the difference between refraction coefficient n2 and the light guide plate 202 refraction coefficient n1, and some incident angle of light are produced inner total reflection.Then, lenticular lenses 206 is set on light guide plate 204.In this, the light guide plate that light guide plate 204 and lenticular lenses 206 also can be considered as integrating.The refraction coefficient n3 of lenticular lenses 206 can equal n2 or be not equal to n2.Light can directly penetrate if n3 equals n2, and for example light guide plate 204 is same materials with lenticular lenses 206, can also be the optical element of monolithic.
At this embodiment, light guide plate 208 has the plane of incidence and optical grating construction face 206a, be arranged on the light guide plate 204, wherein the plane of incidence receives the penetrate light of light guide plate 202 in microstructure 202a zone, then, isolate for example different-waveband light of RGB by the relation of diffraction phenomena and wavelength by the optical grating construction face.Then, another light guide plate 208 is arranged on the light guide plate 206.At this embodiment, the interface between light guide plate 208 and the light guide plate 206 is to combine closely with the structure of conformal (conformal).Yet for the practical design arrangement, conformal tight structure is not unique mode.
Then, for being had preferably, isolated light utilizes, for example cooperate the inferior pixel of image display panel 212 to show, the exiting surface of light guide plate 208 can be provided with a plurality of protrusion deviation structure 208a again, with with these color light deviations to predetermined direction, for example be the direction of near vertical in light guide plate 208.The design example of protruding deviation structure 208a is if any two inclined-planes.Can receive the colorama of separation on the inclined-plane of incidence point 214f, make its refraction enter into another inclined-plane.The oblique angle on this inclined-plane can produce reflecting effect, penetrates toward predetermined party.
Fig. 4 illustrates according to the embodiment of the invention, the mechanism of action synoptic diagram of the protrusion deviation structure 208a in Fig. 2.Consult Fig. 4, protrude deviation structure 208a when incident ray for example enters with 66.95 ° incident angle, and run into the one inclined-plane.Protrude the refraction coefficient n=1.56 of the refraction coefficient n=1.32 of deviation structure 208a less than concentration piece 210 '.Therefore, the inner total reflection meeting betides on another inclined-plane of 20 degree, with the outgoing of near vertical direction, becomes emergent ray.Fig. 4 only is a schematic diagram of mechanism, and the condition of actual design can be according to changes in demand.
Fig. 5 illustrates according to the embodiment of the invention, and optical system for splitting colors is applied to the diagrammatic cross-section of liquid crystal display systems.Consult Fig. 5, the structure of Fig. 5 is similar to mechanism to the structure of Fig. 2, and its differences is that base plate 250 is the structure settings with the reflection horizon, therefore need not consider the refraction coefficient of base plate 250.
Fig. 6 illustrates according to the embodiment of the invention, the section volume rendering synoptic diagram of planar optical system for splitting colors.Aforesaid structure mechanism also can be applied to planar structure, for example be around structure.The light source 500 in zone is incident in leaded light optical element 502 at the center from side, and the structure example on its corrugated is as the same with the structure of Fig. 2, but the protrusion microstructure 504a on the light guide plate 504 is provided with ring-type, and it is luminous to reach face.The light of incident is from being guided to the light of dispersing 506, and it penetrates out by protruding microstructure 504a, becomes area source 508.
Fig. 7 illustrates according to the embodiment of the invention, the variation synoptic diagram of the microstructure of light guide plate.Consulting Fig. 7, is reference with two refraction coefficient n1 and the n2 of Fig. 7 (a), for example is to be that 62.94 ° incident light designs at incident angle.Then can suitably adjust refraction coefficient n2 at Fig. 7 (b), so incident angle can be varied to 61.94 °.At Fig. 7 (c), the oblique angle θ 1 on the inclined-plane of microstructure can adjust, and changes the condition that refraction penetrates.At Fig. 7 (d), when oblique angle θ 1 was changed over oblique angle θ 2, also can reach at incident angle was 61.94 ° application.At Fig. 7 (e), the width of microstructure is W1, and the many a spot of light of its decision can penetrate.At Fig. 7 (f), if the width of the microstructure of Fig. 7 (e) is changed into W2, then the amount of bright dipping can be more.
In other words, aforementioned for embodiment under identical principle of design, can do and suitably adjust design conditions, to reach desired usefulness.
Leaded light design provided by the invention can be adopted marginal ray incident, and then incident light is guided into planar bright dipping, also further can cooperate follow-up diffraction structure that incident light is isolated primitive color light, is beneficial to the color representation of image.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when looking being as the criterion that accompanying Claim defines.
Claims (16)
1. optical system for splitting colors receives incident light by side incident to isolate a plurality of color light, and this optical system for splitting colors comprises:
Base plate;
First light guide plate, have first surface and second surface, a plurality of microstructures are arranged on this second surface, wherein this first surface is arranged on this base plate, this incident light comes back reflective between this first surface and this second surface, wherein Yi Bufen this incident light penetrates in described microstructure, produces to penetrate light;
Second light guide plate has the plane of incidence and optical grating construction face, is arranged on this first light guide plate, and this plane of incidence receives this and penetrates light and isolate described color light by this optical grating construction face; And
The 3rd light guide plate is arranged on this second light guide plate, and wherein the exiting surface of the 3rd light guide plate has a plurality of protrusion deviation structures, with described color light deviation to predetermined direction.
2. optical system for splitting colors as claimed in claim 1, wherein this first light guide plate, this second light guide plate and the 3rd light guide plate are tight rhythmo structure.
3. optical system for splitting colors as claimed in claim 1 comprises that also micro-lens sheet is arranged on the 3rd light guide plate, to assemble described color light to the precalculated position.
4. optical system for splitting colors as claimed in claim 3, wherein this first light guide plate, this second light guide plate, the 3rd light guide plate and this micro-lens sheet are tight rhythmo structure.
5. optical system for splitting colors as claimed in claim 1, wherein this first surface of this first light guide plate and this second surface are to be parallel to each other.
6. optical system for splitting colors as claimed in claim 1, wherein this base plate is reflection horizon or optical material layer, itself and this first light guide plate constitutes inner total reflection.
7. optical system for splitting colors as claimed in claim 1, wherein the interface of this first light guide plate and this second light guide plate except described microstructure, constitutes inner total reflection face.
8. optical system for splitting colors as claimed in claim 1, wherein this second light guide plate is single structure layer or composite construction layer.
9. optical system for splitting colors as claimed in claim 1, wherein this protrusion deviation structure of each of the 3rd light guide plate has the valley structure of first inclined-plane, second inclined-plane formation, the 3rd light guide plate has refraction coefficient, and described color light is reflected in this second inclined-plane from this first inclined-plane outgoing again.
10. optical system for splitting colors as claimed in claim 1, wherein this base plate, this first light guide plate, this second light guide plate and the 3rd light guide plate are bar elements.
11. optical system for splitting colors as claimed in claim 1, wherein this base plate, this first light guide plate, this second light guide plate and the 3rd light guide plate constitute light-emitting area.
12. optical system for splitting colors as claimed in claim 1, wherein this base plate, this first light guide plate, this second light guide plate and the 3rd light guide plate are planar unit, wherein the described microstructure of this first light guide plate is a plurality of list structures, is parallel to each other and extends in a direction.
13. optical system for splitting colors as claimed in claim 1, wherein this base plate, this first light guide plate, this second light guide plate and the 3rd light guide plate are planar unit, and wherein the described microstructure of this first light guide plate is concentric a plurality of around list structure.
14. optical system for splitting colors as claimed in claim 7, wherein the refraction coefficient of this first light guide plate, this second light guide plate and the 3rd light guide plate is respectively n1, n2 and n3, determines the critical angle of inner total reflection by the size of n1, n2 and n3.
15. optical system for splitting colors as claimed in claim 7, wherein this microstructure of each of this first light guide plate has the inclined-plane, destroys inner total reflection, allows this incident light to shine this second light guide plate.
16. optical system for splitting colors as claimed in claim 1 wherein also comprises the 4th light guide plate between this first light guide plate and this second light guide plate.
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| CN2008102129789A CN101676771B (en) | 2008-09-17 | 2008-09-17 | Optical system for splitting colors and display unit using same |
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| CN2008102129789A CN101676771B (en) | 2008-09-17 | 2008-09-17 | Optical system for splitting colors and display unit using same |
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| CN101676771B true CN101676771B (en) | 2011-07-27 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI452402B (en) * | 2010-12-08 | 2014-09-11 | Au Optronics Corp | Display device |
| TW201319679A (en) * | 2011-11-07 | 2013-05-16 | Ind Tech Res Inst | Multi-dimensional assembly and display thereof |
| TWI526741B (en) * | 2015-01-14 | 2016-03-21 | 友達光電股份有限公司 | Back light module |
| CN106959546A (en) | 2016-01-08 | 2017-07-18 | 京东方科技集团股份有限公司 | Backlight and display device |
| CN105700066B (en) * | 2016-04-29 | 2018-11-23 | 京东方科技集团股份有限公司 | Light guide plate, backlight and display device |
| CN108562965B (en) * | 2018-01-10 | 2020-08-25 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN108020883A (en) * | 2018-01-17 | 2018-05-11 | 上海渺视光学科技有限公司 | Augmented reality planar waveguide optical device with multiplelayer microstructure |
| CN114966944B (en) * | 2021-02-23 | 2024-05-28 | 北京小米移动软件有限公司 | Light guide assembly and casing |
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| CN1920642A (en) * | 2005-08-26 | 2007-02-28 | 三星电子株式会社 | Direct light type backlight unit and liquid crystal display |
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| CN1920642A (en) * | 2005-08-26 | 2007-02-28 | 三星电子株式会社 | Direct light type backlight unit and liquid crystal display |
| CN1959494A (en) * | 2005-11-04 | 2007-05-09 | 鸿富锦精密工业（深圳）有限公司 | Color dispersing unit, and liquid crystal display device |
| CN101149445A (en) * | 2007-11-09 | 2008-03-26 | 清华大学 | Grating and its backlight module |
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