CN100426078C - Light guide plate and back light module - Google Patents

Light guide plate and back light module Download PDF

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Publication number
CN100426078C
CN100426078C CNB200410077303XA CN200410077303A CN100426078C CN 100426078 C CN100426078 C CN 100426078C CN B200410077303X A CNB200410077303X A CN B200410077303XA CN 200410077303 A CN200410077303 A CN 200410077303A CN 100426078 C CN100426078 C CN 100426078C
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CN
China
Prior art keywords
guide plate
light guide
light
incidence surface
different
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 - Fee Related
Application number
CNB200410077303XA
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Chinese (zh)
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CN1782802A (en
Inventor
卓宏升
杨秋莲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hongfujin Precision Industry Shenzhen Co Ltd
Innolux Corp
Original Assignee
Hongfujin Precision Industry Shenzhen Co Ltd
Innolux Corp
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Application filed by Hongfujin Precision Industry Shenzhen Co Ltd, Innolux Corp filed Critical Hongfujin Precision Industry Shenzhen Co Ltd
Priority to CNB200410077303XA priority Critical patent/CN100426078C/en
Publication of CN1782802A publication Critical patent/CN1782802A/en
Application granted granted Critical
Publication of CN100426078C publication Critical patent/CN100426078C/en
Expired - Fee Related legal-status Critical Current
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Abstract

The present invention relates to a light guide plate and a backlight module. The light guide plate is provided with a bottom surface, at least one light incident surface and a plurality of light guide units, wherein the light guide units are stacked and arranged along the direction away from the light incident surface of the light guide plate; two adjacent light guide units have different refractivity; the interfaces among the light guide units tilt with the light incident surface. The light guide plate can enhance the light energy utilization ratio of the backlight module.

Description

Light guide plate and module backlight
[technical field]
The invention relates to a kind of light guide plate and module backlight, particularly about a kind of light guide plate and module backlight that promotes the efficiency of light energy utilization.
[background technology]
In recent years, along with the colorize and the maximization of LCD, its application is more extensive, as notebook computer, various desk-top computer and LCD TV etc.Because the liquid crystal display module is a kind of non-self-emission display apparatus, it shows mainly passing through or the obstructed realization of coming by control light beam that external light source sends, therefore need corresponding backlight or preceding optical mode group usually, this backlight or preceding optical mode group can realize Presentation Function with the beam direction display panel that external light source sent.
Seeing also Fig. 1, is a kind of prior art module 10 backlight, mainly is made up of light source 11, light guide plate 12, diffuser plate 13, prism plate combination 14 and reflecting plate 16.This light guide plate 12 comprises a plane of incidence 121, an exit facet 122 and a bottom surface 123, wherein, this plane of incidence 121 receives the light beam that the light source 11 relative with it sends, and with these light beam importing light guide plate 12 inside, this bottom surface 123 should import beam reflection, scattering, formation is along the homodisperse scattered beam of all directions, and this exit facet 122 should be derived light guide plate 12 by homodisperse light beam, guiding display panels (figure does not show).The scattering of these 123 pairs of light beams in bottom surface is to realize that by site 124 this site 124 can utilize mode of printing, with the high reflectance not material such as the titania (TiO of extinction 2) be printed on this bottom surface 123 with the form of circular or square diffusion point.This site 124 can change the direct of travel of these light guide plate 12 internal communication light, destroy its total reflection condition, and, light is evenly penetrated by the exiting surface 122 of this light guide plate 12 by controlling the distribution of this site 124, realize the display panels even illumination of (figure does not show).
See also Fig. 2, it is the light guide plate 22 of another kind of prior art, has groove 224 on the bottom surface 223 of this light guide plate 22, this groove 224 can be made by ejection formation or hot-forming and other method, it destroys the total reflection condition of these light guide plate 22 internal communication light beams by reflection, refraction, and, light is evenly penetrated by the exiting surface 222 of this light guide plate 22 by controlling shape, height or its spacing distance of this groove 224.
The light guide plate of above-mentioned two kinds of prior aries is only carried out scattering to the light that incides the bottom surface, the light that is parallel to the bottom surface then penetrates by material absorption itself or by other surface, and the light that is scattered transmits to different directions, the light that only is dispersed into directly over the light guide plate is penetrated by the exiting surface of light guide plate, and other light is absorbed by material itself or by penetrating on other surface, thereby the efficiency of light energy utilization of light guide plate is lower.
[summary of the invention]
For solving the lower problem of the efficiency of light energy utilization of light guide plate in the prior art module backlight, the invention provides a kind of light guide plate with higher efficiency of light energy utilization.
For solving the lower problem of the efficiency of light energy utilization of prior art module backlight, the present invention also provides a kind of module backlight with higher efficiency of light energy utilization.
The technical scheme that technical solution problem of the present invention is adopted is: a kind of light guide plate is provided, it has a bottom surface and at least one incidence surface, this light guide plate comprises a plurality of light elements, these a plurality of light elements are arranged along the direction away from this light guide plate incidence surface, these a plurality of light elements are formed by the different resin material of a plurality of refractive indexes, and two adjacent light elements have different refractive index arbitrarily, and the interphase between this light element and this incidence surface tilt, and each interfacial angle of inclination is different.
The incidence surface of light guide plate of the present invention further is provided with optical grating construction.
The exiting surface of light guide plate of the present invention further is provided with stripe shape or pyramid projection.
The present invention also provides a kind of module backlight, it comprises a light guide plate, one reflecting plate and at least one light source, this light guide plate comprises an exiting surface, one with this exiting surface opposed bottom surface and at least one incidence surface that links to each other with this exiting surface, this reflecting plate this bottom surface relatively is provided with, this light source this incidence surface relatively is provided with, this light guide plate comprises a plurality of light elements, these a plurality of light elements are along the direction phase stacked arrangement away from this light guide plate incidence surface, these a plurality of light elements are formed by the different resin material of a plurality of refractive indexes, and two adjacent light elements have different refractive index arbitrarily, interphase between this light element and this incidence surface tilt, and each interfacial angle of inclination is different.
Module backlight of the present invention further is provided with a polarization separation element at the exiting surface of light guide plate, between the bottom surface of light guide plate and reflecting plate a polarization element is set.
Compared with prior art, light guide plate of the present invention is formed by a plurality of light element stacked arrangement, interfacial angle of inclination between the refringence between adjacent two light elements of utilization change and this two light element, reflection and the refraction of control light on this interphase, these all light of light guide plate internal transmission are evenly penetrated by the exiting surface of this light guide plate, thereby overcome the optical energy loss that scattering phenomenon caused of prior art.The optical grating construction of the incidence surface setting of light guide plate of the present invention can further be lifted into optical efficiency by diffraction effect.The exiting surface raised structures of light guide plate of the present invention can converge emergent ray, improves the bright dipping briliancy perpendicular to this light guide plate exiting surface direction.Polarization separation element that module backlight of the present invention is included and polarization element can be converted into the part polarized light that is originally absorbed by the polaroid of liquid crystal panel (figure does not show) can be by the polarized light of polaroid, thereby promotes the efficiency of light energy utilization of module backlight.
[description of drawings]
Fig. 1 is the structural representation of a kind of prior art module backlight.
Fig. 2 is the structural representation of another kind of prior art light guide plate.
Fig. 3 is the work synoptic diagram of light guide plate first embodiment of the present invention.
Fig. 4 is the structural representation of the incidence surface of light guide plate first embodiment of the present invention.
Fig. 5 is the structural representation of the incidence surface of light guide plate second embodiment of the present invention.
Fig. 6 is the structural representation of the exiting surface of light guide plate the 3rd embodiment of the present invention.
Fig. 7 is the structural representation of the present invention's module first embodiment backlight.
Fig. 8 is the structural representation of the present invention's module second embodiment backlight.
[embodiment]
Seeing also Fig. 3, is the structural representation of light guide plate first embodiment of the present invention.This light guide plate 32 has an incidence surface 321 and a bottom surface 323, these light guide plate 32 inside comprise a plurality of light elements 320, the material of this light element 320 can be two kinds in methacrylic resin, polyacrylic resin, polycarbonate, the polyvinyl resin, also can select two or more materials, perhaps the different blended condensation material of above-mentioned material.These a plurality of light elements 320 are arranged along the direction away from these light guide plate 32 incidence surfaces 321, two adjacent light elements have different refractive index, interphase 324 and this incidence surface 321 of this light element 320 tilt, light by incidence surface 321 incidents of this light guide plate 32 produces refraction and reflection, the interfacial transmissivity T of its i layer through this interphase 324 iWith reflectivity R iCan be expressed as:
R i＝|γ p，i| 2+|γ s，i| 2；T i＝|t p，i| 2+|t s，i| 2
Wherein:
γ p , i = - n i + 1 cos θ i - n i cos θ i + 1 n i + 1 cos θ i + n i cos θ i + 1 ;
γ s , i = - n i + 1 cos θ i + 1 - n i cos θ i n i + 1 cos θ i + 1 + n i cos θ i ;
t p , i = 2 n i cos θ i n i + 1 cos θ i + n i cos i + 1 ;
t s , i = 2 n i cos θ i n i + 1 cos θ i + 1 + n i cos i ;
γ S, i, γ P, iRepresent that respectively S polarized light and P polarized light are in the reflection coefficient of i layer interphase 324, t S, i, t P, iRepresent that respectively S polarized light and P polarized light are in the transmission coefficient of i layer interphase 324.The present invention can make the exiting surface 322 even outgoing of the light of these light guide plate 30 inside by this light guide plate 30 by the refractive index of each light element 320 of adjustment and the angle of each interphase 324.
See also Fig. 4, the incidence surface of light guide plate 42 of the present invention can further be set to optical grating construction 44, makes light effectively enter this light guide plate 42, and the direct of travel of may command light.
See also Fig. 5, the incidence surface of light guide plate 52 of the present invention can further be set to arcuate surface 56, and light is further concentrated.
See also Fig. 6, the exiting surface 622 of light guide plate 62 of the present invention can further be set to raised structures 624, and emergent ray is converged to the vertical direction of this exiting surface 622, and this raised structures 624 can be stripe shape projection or pyramid projection.
Seeing also Fig. 7, is the structural representation of first embodiment of the present invention's module 70 backlight.This module 70 backlight comprises light source 71, light guide plate 72, diffuser plate 73, prism plate 74 and reflecting plate 76.This light guide plate 72 comprises an incidence surface 721 and a bottom surface 723, these these light guide plate 72 inside comprise a plurality of light elements 720, the material of this light element 720 can be two kinds in methacrylic resin, polyacrylic resin, polycarbonate, the polyvinyl resin, also can select two or more materials, perhaps the different blended condensation material of above-mentioned material.These a plurality of light elements 720 are arranged along incidence surface 721 directions away from this light guide plate 72, adjacent two light elements have different refractive index, the interphase 724 of this light element 720, this interphase 724 is planes, tilt with this incidence surface 721, produce refraction and reflection through this interphase 724 by the light of incidence surface 721 incidents of this light guide plate 72.The refractive index by adjusting each light element 720 and the angle of each interphase 724 can make the exiting surface 722 even outgoing of these light guide plate 72 internal light by this light guide plate 72.
Seeing also Fig. 8, is the structural representation of the present invention's module second embodiment backlight.This module 80 backlight is except that comprising light source 81, light guide plate 82, reflecting plate 86, it further is provided with a polarization separation element 88 at the exiting surface 822 of this light guide plate 82, between the bottom surface 823 of this light guide plate 82 and this reflecting plate 86, a polarization element 87 is set, this polarization separation element 82 can be multilayer membrane type reflecting polarizer (the DualBrightness Enhance Film that 3M company (Minne sota Mining andManufacturing C ompany) produces, DBEF), this polarization element 87 is quarter-wave plates.Interphase 824 refractions and reflection that are had the light-guide device 820 of different refractivity by the light of incidence surface 821 incidents of this light guide plate 82, via exiting surface 822 outgoing, this emergent ray is a natural light, it incides this polarization separation element 88, this polarization separation element 88 makes the wherein polarized light transmission of a polarization direction, and the vertically polarized light of this polarization direction reflection, this reflection ray enters this light guide plate 82, and be converted into through the bit phase delay of this polarization element 87 and 86 reflections of this reflecting plate can be by the light of these polarization separation element 88 transmissions, this module 80 backlight can make the part polarized light that is absorbed by the polaroid of liquid crystal panel (figure does not show) originally be converted into can pass through the polarized light of this polaroid, and then promotes the light extraction efficiency of module backlight.This polarization separation element 88 can also adopt the realization that matches with quarter-wave plate of cholesterol formula reflecting polarizer.

Claims (12)

1. light guide plate, it has a bottom surface and at least one incidence surface, it is characterized in that: this light guide plate inside further comprises a plurality of light elements, these a plurality of light elements are arranged along the direction away from this light guide plate incidence surface, these a plurality of light elements are formed by the different resin material of a plurality of refractive indexes, and two adjacent light elements have different refractive index arbitrarily, and the interphase between this light element and this incidence surface tilt, and each interfacial angle of inclination is different.
2. light guide plate as claimed in claim 1 is characterized in that: the different resin material of these a plurality of refractive indexes is methacrylic resin, polyacrylic resin, polycarbonate, polyvinyl resin or its made from mixed materials.
3. light guide plate as claimed in claim 1 is characterized in that: this interphase is a plane.
4. light guide plate as claimed in claim 1 is characterized in that: the incidence surface of this light guide plate has optical grating construction.
5. light guide plate as claimed in claim 1 is characterized in that: the incidence surface of this light guide plate is the arc structure to the inboard depression of this light guide plate.
6. light guide plate as claimed in claim 1 is characterized in that: the exiting surface of this light guide plate has raised structures.
7. light guide plate as claimed in claim 6 is characterized in that: this raised structures is stripe shape projection or the pyramid raised structures that is parallel to this incidence surface.
8. module backlight, it comprises:
One light guide plate, it comprises an exiting surface, one with this exiting surface opposed bottom surface and at least one incidence surface that links to each other with this exiting surface;
One reflecting plate, it is provided with this bottom surface relatively;
At least one light source, it is this incidence surface setting relatively;
It is characterized in that: this light guide plate inside further comprises a plurality of light elements, these a plurality of light elements are along the incidence surface direction phase stacked arrangement away from this light guide plate, these a plurality of light elements are formed by the different resin material of a plurality of refractive indexes, and two adjacent light elements have different refractive index arbitrarily, interphase between this light element and this incidence surface tilt, and each interfacial angle of inclination is different.
9. module backlight as claimed in claim 8 is characterized in that: the different resin material of these a plurality of refractive indexes is methacrylic resin, polyacrylic resin, polycarbonate, polyvinyl resin or its made from mixed materials.
10. module backlight as claimed in claim 8, it is characterized in that: this module backlight further comprises a polarization separation element and a polarization element, this polarization separation element is arranged at the exiting surface of this light guide plate, and this polarization element is arranged between the bottom surface and this reflecting plate of this light guide plate.
11. module backlight as claimed in claim 10 is characterized in that: this polarization separation element is a multilayer membrane type reflecting polarizer, or a cholesterol formula reflecting polarizer cooperates a quarter-wave plate.
12. module backlight as claimed in claim 10 is characterized in that: this polarization element is a quarter-wave plate.
CNB200410077303XA 2004-12-04 2004-12-04 Light guide plate and back light module Expired - Fee Related CN100426078C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB200410077303XA CN100426078C (en) 2004-12-04 2004-12-04 Light guide plate and back light module

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Application Number Priority Date Filing Date Title
CNB200410077303XA CN100426078C (en) 2004-12-04 2004-12-04 Light guide plate and back light module

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CN100426078C true CN100426078C (en) 2008-10-15

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5818719B2 (en) * 2012-03-05 2015-11-18 株式会社ジャパンディスプレイ Display device and anisotropic scatterer
CN103925523B (en) * 2014-04-02 2016-06-15 京东方科技集团股份有限公司 A kind of backlight module and display device
CN105022192A (en) * 2015-08-10 2015-11-04 苏州固特斯电子科技有限公司 High concentration photovoltaic liquid crystal display module
CN106324891B (en) * 2016-09-21 2019-06-07 武汉华星光电技术有限公司 A kind of LCD display of the symmetrical scattering light of formation
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161873A (en) * 1991-02-27 1992-11-10 Sharp Kabushiki Kaisha Apparatus for lighting of liquid crystal
JPH06337413A (en) * 1993-05-28 1994-12-06 Asahi Glass Co Ltd Liquid crystal display device
JPH08286185A (en) * 1995-04-17 1996-11-01 Sekisui Chem Co Ltd Surface light emission device
CN1504776A (en) * 2002-12-05 2004-06-16 鸿富锦精密工业（深圳）有限公司 Light conducting element
JP2004241323A (en) * 2003-02-07 2004-08-26 Hitachi Maxell Ltd Planar light source and liquid crystal display device using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161873A (en) * 1991-02-27 1992-11-10 Sharp Kabushiki Kaisha Apparatus for lighting of liquid crystal
JPH06337413A (en) * 1993-05-28 1994-12-06 Asahi Glass Co Ltd Liquid crystal display device
JPH08286185A (en) * 1995-04-17 1996-11-01 Sekisui Chem Co Ltd Surface light emission device
CN1504776A (en) * 2002-12-05 2004-06-16 鸿富锦精密工业（深圳）有限公司 Light conducting element
JP2004241323A (en) * 2003-02-07 2004-08-26 Hitachi Maxell Ltd Planar light source and liquid crystal display device using the same

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