CN1641439A - Light guide board and its manufacturing method - Google Patents
Light guide board and its manufacturing method Download PDFInfo
- Publication number
- CN1641439A CN1641439A CN 200410015227 CN200410015227A CN1641439A CN 1641439 A CN1641439 A CN 1641439A CN 200410015227 CN200410015227 CN 200410015227 CN 200410015227 A CN200410015227 A CN 200410015227A CN 1641439 A CN1641439 A CN 1641439A
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- Prior art keywords
- light guide
- guide plate
- grating
- aluminium foil
- light
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- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
This invention provides a kind of light-transmitting board with well-proportioned light-out intensity and simple producing process. The light-transmitting board includes a light-in plane, a light-out plane crossed with the light-out one, a underside corresponding to the light-out plane and several side planes. The underside clings to a reflecting style of aluminum foil holographic slice designed on the basis of the digital computer holograph and on which equipped several reflecting pels organs with several first rasters. Besides this invention also provides the producing method of the light-transmitting board.
Description
[technical field]
The invention relates to a kind of light guide plate and manufacture method thereof.
[background technology]
Advantages such as the liquid crystal display utensil is light, thin, power consumption is little are widely used in modernized information equipments such as notebook, mobile phone, personal digital assistant.Because the liquid crystal in the LCD itself is not had a characteristics of luminescence, need provide area source to realize Presentation Function for it.Area source and light guide plate thereof need have higher emitting brightness and uniformity coefficient, thereby promote color contrast, full frame regional luminance effect and the visible angle of LCD.
A kind of light guide plate of prior art is the diffraction type light guide plate that on May 7th, 2000, disclosed European patent disclosed for the 1st, 016, No. 817 as shown in Figure 1.The upper surface of this light guide plate 313 is provided with optical grating construction 316, and this optical grating construction 316 can make the light intensity that is coupled out light guide plate 313 be evenly distributed.
But, for effectively utilizing luminous energy, these light guide plate 313 belows need to be provided with a reflector 314, and the diffraction type light guide plate that prior art discloses is that the mode with the plastics ejection formation directly forms diffraction grating on light guide plate, it need produce many group dies on Jet forming machine, so its processing procedure is more loaded down with trivial details, production cost is higher.
[summary of the invention]
In order to overcome the more loaded down with trivial details shortcoming of prior art diffraction type light guide plate processing procedure, the invention provides the simple and uniform light guide plate of emitting brightness of a kind of processing procedure.
The present invention also provides a kind of above-mentioned manufacturing method of light conducting board.
The technical scheme that technical solution problem of the present invention is adopted is: a kind of light guide plate is provided, the exiting surface that this light guide plate comprises an incidence surface, intersect with incidence surface, with exiting surface opposed bottom surface and a plurality of side, this bottom surface attaches a reflective aluminium foil hologram, which is provided with a plurality of reflective pixel unit, be provided with a plurality of first gratings in this pixel cell.
The present invention provides a kind of above-mentioned manufacturing method of light conducting board simultaneously, and it comprises the steps: to provide a computer-generated hologram photo light shield; Utilize this computer-generated hologram photo light shield to make accurate holograms mould; The mode of utilizing roll extrusion is rolled into the diffraction pattern of this mould on the reflective aluminium foil, makes reflective aluminium foil hologram; One transparent base is provided, the exiting surface that this transparent base comprises an incidence surface, intersect with incidence surface, with exiting surface opposed bottom surface and a plurality of side, utilize the bottom surface that will this reflective aluminium foil hologram be attached to this transparent base with the transparent material of this transparent base refractive index match.
The invention has the beneficial effects as follows: compared with prior art, light guide plate of the present invention is with the production method of required diffraction pattern by roll extrusion, be rolled on the reflective aluminium foil and and be attached on the light guide plate it, therefore a single die of need employing rolls out the computer-generated hologram photo on the aluminium foil, processing procedure is simpler, and the reflective aluminium foil hologram length that can utilize cylinder to produce is unrestricted.This reflective aluminium foil hologram is to be basic engineering with the digital computer holograms, which is provided with a plurality of grating reflection pixel cells that have, therefore the coupling efficiency that goes out of this light guide plate can be by changing the parameter control of grating and pixel cell, and the selection suitable parameters just can reach the uniform purpose of emitting brightness.And this reflective aluminium foil hologram has the function of reflecting plate simultaneously, does not need to be provided with in addition reflecting plate.
[description of drawings]
Fig. 1 is the side view of the light guide plate of prior art tool diffraction grating.
Fig. 2 is the schematic perspective view of light guide plate of the present invention.
Fig. 3 is the reflective aluminium foil hologram structural representation of light guide plate of the present invention.
Fig. 4 is the partial enlarged drawing of Fig. 3.
Fig. 5 A is a kind of conceptual schematic drawing of the pixel of the reflective aluminium foil hologram of light guide plate of the present invention.
Fig. 5 B is the another kind of conceptual schematic drawing of the pixel of the reflective aluminium foil hologram of light guide plate of the present invention.
Fig. 6 is the process flow diagram of method for manufacturing light guide plate of the present invention.
[embodiment]
See also Fig. 2, the exiting surface 33 that light guide plate 30 of the present invention comprises an incidence surface 31, intersect with incidence surface 31, be attached on the bottom surface 34 of light guide plate 30 by transparent material (indicating) with light guide plate 30 refractive index match with exiting surface 33 opposed bottom surface 34 and a plurality of side 35, one reflective aluminium foil holograms 36.The light that light source 10 penetrates is injected light guide plate 30 from incidence surface 31, passes transparent material through the bottom surface 34 of light guide plate 30, and through behind the diffraction of reflective aluminium foil hologram 36, evenly penetrates from exiting surface 33.Should not have the clearance between light guide plate 30 and the reflective aluminium foil hologram 36,, thereby make light on reflective aluminium foil hologram 36, total reflection take place so that the light in the light guide plate 30 directly 34 penetrates and arrive reflective aluminium foil hologram 36 from the bottom surface.
See also Fig. 3 and Fig. 4, the design of this reflective aluminium foil hologram 36 is to be designed to the basis with the digital computer holograms, which is provided with the about 100 μ m of a plurality of areas
2～40000 μ m
2Pixel as reflective pixel unit 360, the span of this pixel cell 360 both sides X, Y is 10 μ m～200 μ m.
Be provided with a plurality of first gratings 361 in this pixel cell 360, and its middle position includes the central area 362 that does not contain grating, its area is about 20 μ m
2～3900 μ m
2The cycle λ of this first grating 361 is about 1 μ m～3 μ m, and the degree of depth is about 0.1 μ m～1 μ m, and its grating vector K (this grating vector K is meant the distribution arrangement of first grating 361) is by the sensing decision of light source 31 to this pixel cell 360.
The diffraction efficiency calculation formula of this first grating 361 is ε=J
1 2(Φ
1), Φ wherein
1Be the phase grating modulated amplitude index of grating vector K, J
1(Φ
1) be the single order Bessel function.
Then this pixel cell 360 goes out coupling efficiency η
Coupling=A* ε.
Incident light is at the reflectivity η of this pixel cell 360
Instead=ε * A/S.
S is the area (hereinafter to be referred as elemental area S) of pixel cell 360 in the formula, and A is the area (hereinafter to be referred as area of raster A) of first grating 361.
As shown from the above formula, when increasing area of raster A or increasing the ratio of area of raster A and elemental area S, pixel cell 360 go out coupling efficiency η
CouplingAnd reflectivity η
InsteadAlso increase thereupon, therefore control area of raster A and elemental area S just controllable pixels unit 360 go out coupling efficiency η
CouplingWith its reflectivity η
Instead, and reach the uniform purpose of exiting surface 33 emitting brightness by the design of the pixel cell 360 and first grating 361.
Please together consulting Fig. 5 A and Fig. 5 B, is the different embodiments of the pixel cell 360 of reflective aluminium foil hologram 36.As Fig. 5 A, for luminous energy is coupled to different directions, setting has grating vector K1 and the second vertical grating 363 of grating vector K in the central area 362 of each pixel cell 360.The another kind of design of pixel cell 360 is grating regions that the different grating vectors of a plurality of tools are set in pixel cell 360 among Fig. 5 B.
In addition, for eliminating the chromatic dispersion of grating, also pixel cell 360 can be designed as sub-pixel, and per three sub-pixel combinations are become one group of design, the sub-pixel of each group is respectively at different color light (ruddiness, blue light and gold-tinted) design, and the grating cycle of each sub-pixel is then designed at the wavelength of different color light.
Simultaneously, for further improving the utilization factor and the light-emitting uniformity of light, a plurality of sides 35 of this light guide plate also can attach reflective aluminium foil hologram, and the V-type groove can be set at the exiting surface of this light guide plate.
See also Fig. 6, method for manufacturing light guide plate of the present invention comprises the steps:
One computer-generated hologram photo light shield is provided, and this computer-generated hologram photo light shield is write as by electron beam direct;
Utilize this computer-generated hologram photo light shield to make the mould of accurate holograms;
The mode of utilizing roll extrusion on reflective aluminium foil, is made reflective aluminium foil hologram with the diffraction pattern roll extrusion of this mould;
One transparent base that can make light guide plate is provided, and this transparent base comprises an incidence surface, one and incidence surface bottom surface and a plurality of side of intersecting.The transparent material of utilization and this transparent base refractive index match as various optics viscose glues, resin or refractive index match wet goods, is attached to this reflective aluminium foil hologram the bottom surface of transparent base.
If adopt coupling oil this transparent base of coupling and reflective aluminium foil hologram with this transparent base refractive index match, then need adopt the mode of encapsulation will mate oil sealing and be loaded between transparent base and the reflective aluminium foil hologram.Can produce total reflection for guaranteeing that incident light is incident on the reflective aluminium foil hologram simultaneously, should not have the clearance between this transparent base and reflective aluminium foil hologram.
Simultaneously, for improving the efficiency of light energy utilization, this manufacturing method of light conducting board also comprises the transparent material that utilizes with the transparent base refractive index match, attaches the step of reflective aluminium foil hologram in each side of transparent base.
Compared with prior art, the manufacturing side of the reflective aluminium foil hologram of manufacturing of the present invention Method is to utilize computer-generated hologram photo light shield to make mould, this mould placed on the roller press, Utilize the mode of roll extrusion to roll out computer full figure grating on the aluminium foil, owing to adopt roll extrusion Mode make reflective aluminium foil hologram, therefore only need utilize single die just can realize instead Penetrate the continuous production of formula aluminium foil hologram, and the present invention is that aluminium foil reflector plate and computer is complete The combination of picture grating, escapable cost is also simplified and is made flow process. Simultaneously, because the present invention's employing The computer-generated hologram photo, the uniformity of LGP emitting brightness can be by the control computer-generated hologram The pixel unit of photo and the parameter of grating reach.
Claims (12)
1. light guide plate, the exiting surface that it comprises an incidence surface, intersect with incidence surface, with exiting surface opposed bottom surface and a plurality of side, it is characterized in that: this bottom surface of light guide plate attaches a reflective aluminium foil hologram, which is provided with a plurality of reflective pixel unit, be provided with a plurality of first gratings in this pixel cell.
2. light guide plate as claimed in claim 1 is characterized in that: this pixel cell area is at 100 μ m
2To 40000 μ m
2Between, its degree of depth is between 0.1 μ m to 1 μ m, and the periodic regime of this first grating is 1 μ m to 3 μ m, and its grating vector is by the sensing decision of light source to each pixel.
3. light guide plate as claimed in claim 1 is characterized in that: this pixel cell center is provided with a central area that does not contain grating, and the span of this central area area is 20 μ m
2To 3900 μ m
2
4. light guide plate as claimed in claim 1 is characterized in that: the bright dipping coupling efficiency η of this exiting surface
CouplingSatisfy formula η
Coupling=A* ε, A is the area of raster of this first grating in the formula, and ε is a grating diffraction efficient, and its computing formula is ε=J
1 2(Φ
1), Φ
1Be the phase grating modulated amplitude index of grating vector, J
1(Φ
1) be the single order Bessel function, the reflectivity η of this reflective aluminium foil hologram
InsteadSatisfy formula η
Instead=ε * A/S, S is an elemental area in the formula.
5. light guide plate as claimed in claim 2 is characterized in that: this central area is provided with grating vector and mutually perpendicular second grating of first grating vector.
6. light guide plate as claimed in claim 1 is characterized in that: wherein this reflective aluminium foil hologram is a sub-pixel with this pixel cell, and is one group with three sub-pixel combinations, and the grating cycle of each sub-pixel is at different coloured light wavelength designs.
7. light guide plate as claimed in claim 1 is characterized in that: the grating that is provided with the different grating vectors of a plurality of tools in this pixel cell.
8. light guide plate as claimed in claim 1 is characterized in that: a plurality of sides of this light guide plate are pasted with reflective aluminium foil hologram.
9. method for manufacturing light guide plate, it comprises: a computer-generated hologram photo light shield is provided; Utilize this computer-generated hologram photo light shield to make accurate holograms mould; The mode of utilizing roll extrusion on reflective aluminium foil, is made reflective aluminium foil hologram with the diffraction pattern roll extrusion of this mould; One transparent base is provided, the exiting surface that this transparent base comprises an incidence surface, intersect with incidence surface, with exiting surface opposed bottom surface and a plurality of side, utilize the transparent material with this transparent base refractive index match that this reflective aluminium foil hologram is attached on the bottom surface of this transparent base.
10. method for manufacturing light guide plate as claimed in claim 9 is characterized in that: this transparent material is optics viscose glue or resin.
11. method for manufacturing light guide plate as claimed in claim 9 is characterized in that: this transparent material is an index-matching oil, and it is to be encapsulated between light guide plate and the reflective aluminium foil hologram by the mode that encapsulates.
12. method for manufacturing light guide plate as claimed in claim 9 is characterized in that: it further is included in the step that each side of transparent base attaches reflective aluminium foil hologram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410015227XA CN100376955C (en) | 2004-01-14 | 2004-01-14 | Light guide board and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410015227XA CN100376955C (en) | 2004-01-14 | 2004-01-14 | Light guide board and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1641439A true CN1641439A (en) | 2005-07-20 |
| CN100376955C CN100376955C (en) | 2008-03-26 |
Family
ID=34867972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410015227XA Expired - Fee Related CN100376955C (en) | 2004-01-14 | 2004-01-14 | Light guide board and its manufacturing method |
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| Country | Link |
|---|---|
| CN (1) | CN100376955C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685178B (en) * | 2008-09-27 | 2012-05-30 | 比亚迪股份有限公司 | Diffraction light guide film and preparation method thereof |
| CN103123051A (en) * | 2011-11-21 | 2013-05-29 | 鸿富锦精密工业（深圳）有限公司 | Light source module assembly and light-emitting device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2116262U (en) * | 1991-12-05 | 1992-09-16 | 济南印刷二厂 | Directly moulding laser holographic trade mark |
| JPH09127894A (en) * | 1995-10-27 | 1997-05-16 | Asahi Glass Co Ltd | Surface light source device |
| JP2865618B2 (en) * | 1996-05-31 | 1999-03-08 | 嶋田プレシジョン株式会社 | Light guide plate and light guide plate assembly |
| JPH11147255A (en) * | 1997-11-19 | 1999-06-02 | Matsushita Electric Ind Co Ltd | Manufacture of light conduction plate with prism shape |
| FI106992B (en) * | 1999-05-28 | 2001-05-15 | Ics Intelligent Control System | A light indicator |
| JP3457591B2 (en) * | 1999-10-08 | 2003-10-20 | インターナショナル・ビジネス・マシーンズ・コーポレーション | Liquid crystal display |
-
2004
- 2004-01-14 CN CNB200410015227XA patent/CN100376955C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685178B (en) * | 2008-09-27 | 2012-05-30 | 比亚迪股份有限公司 | Diffraction light guide film and preparation method thereof |
| CN103123051A (en) * | 2011-11-21 | 2013-05-29 | 鸿富锦精密工业（深圳）有限公司 | Light source module assembly and light-emitting device |
| CN103123051B (en) * | 2011-11-21 | 2016-05-11 | 鸿富锦精密工业（深圳）有限公司 | Light source module and light-emitting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100376955C (en) | 2008-03-26 |
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Granted publication date: 20080326 Termination date: 20160114 |