CN100419528C - Back light assembly and its light guide board - Google Patents
Back light assembly and its light guide board Download PDFInfo
- Publication number
- CN100419528C CN100419528C CNB031401988A CN03140198A CN100419528C CN 100419528 C CN100419528 C CN 100419528C CN B031401988 A CNB031401988 A CN B031401988A CN 03140198 A CN03140198 A CN 03140198A CN 100419528 C CN100419528 C CN 100419528C
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- light
- guide plate
- light guide
- grating fringe
- module backlight
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The present invention discloses a back light module and a light guide plate thereof. The back light module comprises a light guide plate and a point light source, wherein the light guide plate comprises a light incident surface, a light emergent surface which intersects the light incident surface, and a bottom surface which is opposite to the light emergent surface. Light beams emitted by the point light source pass through the light incident surface and enter the light guide plate in specific light field distribution, a plurality of strong and weak regions of incident light is formed, and the light emergent surface is provided with a plurality of gratings which are distributed in the strong and weak regions of incident light near the point light source. The present invention can reduce incident dark bands of the light guide plate, and the light guide plate and the back light module which adopts the light guide plate have high light emergent uniformity.
Description
[technical field]
The present invention relates to a kind of module backlight and light guide plate thereof, particularly about a kind of backlight liquid crystal display module and light guide plate thereof of being applied to.
[background technology]
Because advantages such as LCD has gently, approaches, power consumption is little are widely used in modernized information equipments such as notebook, mobile phone, personal digital assistant.Because liquid crystal itself does not have the characteristics of luminescence, need provide module backlight to realize Presentation Function for it.
As everyone knows, module backlight need have higher outgoing light homogeneity, thereby promotes the visible angle of color contrast, full frame regional luminance effect and the complete machine of the LCD that adopts this module backlight.
Prior art module backlight comprises light source and light guide plate, the light entrance face 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 in order to the total reflection condition of broken beam in the light guide plate internal transmission, and make its scattering improving the homogeneity of light guide plate outgoing beam, and then promote the overall performance of module backlight.The density of this site, size all can have different designs to adapt to different modules backlight.
A kind of prior art module backlight can be consulted Fig. 1.This module 9 backlight is made up of light guide plate 10, trnaslucent materials plate 20, reflectorized material box 30 and light source 40.This trnaslucent materials plate 20 folded being located on the light guide plate 10, around the light guide plate 10 and basal surface 12 be included in this reflectorized material box 30, these reflectorized material box 30 1 sides are offered and are accommodated light source 40 locating slot 31 within it.During work, the light beam that light source 40 sends is from a side incident of light guide plate 10, gradually layer wave lines and reflectorized material box 30 effect backs through light guide plate 10 basal surfaces 12 produce planar light, and from light-emitting face 11 outgoing of light guide plate 10, this trnaslucent materials plate 20 makes this planar light distribution more even.
See also Fig. 2, because light source 40 has certain emission angle, emission angle as light emitting diode can be 30 to 130 degree, and the side of these light guide plate 10 relative light sources 40 is planes, the light beam that makes light source 40 send enters light guide plate 10 after this side refraction, its angle of divergence will further be dwindled, maximum is about about 119.653 degree, form the weak district of incident intensity (not indicating), thereby produce bigger blanking bar 13 at light guide plate 10 light incident sides, and then reduce the light beam utilization factor, influence module 9 backlight and even adopt the briliancy and the light-emitting uniformity of the LCD of this module 9 backlight.
See also Fig. 3, on May 1st, 2003, the TaiWan, China patent of bulletin disclosed a kind of module backlight that reduces light guide plate incident dark space for the 530th, No. 919.This module backlight is provided with a plurality of potholes 50 on light guide plate 3, these a plurality of potholes 50 are arranged and are arranged on pointolite incidence point 2 dead aheads.Each pointolite incidence point 2 the place ahead is arranged with a series of a plurality of potholes 50 respectively, these a plurality of potholes 50 can run through light guide plate 3, when touching pothole 50 outer rims, incident ray produces anaclasis or light total reflection effect, but the optical directability that its breakdown point light source is stronger also increases the light dispersion angle, helps to improve the defective that there is the dark space in light guide plate 3 light incident sides.
But, this pothole 50 is laid near light guide plate 3 incidence surfaces, the light total reflection effect that incident ray contacts its surface generation makes the incident light that has partly entered light guide plate 3 be reflected, and tails off reduction light utilization efficiency and module bright dipping briliancy backlight towards the light guide plate 3 inner light quantities that continue transmission; And these a plurality of potholes 50 are formed on light guide plate 3 inside, and light makes the light ray energy loss that is incident to light guide plate inside in the refraction on pothole 50 surfaces with reflection; In addition, pothole 50 refractive indexes are different with the refractive index of light guide plate 3, hinder the deep transmission of incident ray, incidence point is stronger by the less regional light intensity that pothole 50 surrounds, other bigger zone is because factors such as the obstruction of the minimizing of incident light energy, pothole 50 and scattared energy losses, make transfer to this big zone light intensity a little less than, influence the uniformity coefficient and the briliancy of light guide plate bright dipping.
[summary of the invention]
In order to overcome the low defective of prior art back light system outgoing light homogeneity, the invention provides the high module backlight of a kind of outgoing light homogeneity.
The present invention also provides a kind of outgoing light homogeneity higher light guide plate.
The technical scheme of technical solution problem of the present invention is: a kind of module backlight is provided, comprise light guide plate and pointolite, this light guide plate comprises light entrance face, the light-emitting face that intersects with this light entrance face and with the light-emitting face opposed bottom surface, this pointolite emitted light beams enters light guide plate with the specific light field distribution through light entrance face, form the weak district of a plurality of incident intensities, and light-emitting face is provided with a plurality of gratings, these a plurality of gratings are distributed in the weak district of incident intensity, these a plurality of gratings comprise grating fringe and the spacer portion between grating fringe, this grating fringe and light entrance face tilt to intersect, and form triangle nested against one another.
The present invention also provides a kind of outgoing light homogeneity higher light guide plate, this light guide plate is in order to the points of engagement light source, comprise the light entrance face of receiving beam, intersect with this light entrance face and the light-emitting face of lead beam outgoing and with the light-emitting face opposed bottom surface, and light-emitting face is provided with a plurality of gratings, and these a plurality of gratings are distributed in the weak district of the incident intensity that light beam that pointolite sends forms.
Compare prior art, the invention has the beneficial effects as follows: because the light-emitting face of light guide plate of the present invention is provided with a plurality of gratings, and these a plurality of gratings are distributed in because the weak district of the formed incident intensity of specific light field distribution of pointolite, thereby utilize these a plurality of gratings can be with the character of direction of beam propagation to external diffusion, the light beam that makes pointolite send can spread the weak district of laggard incident intensity through these a plurality of gratings, reach the phenomenon that reduces even eliminate light guide plate incident blanking bar, make light guide plate and adopt the higher outgoing light homogeneity of module tool backlight of this light guide plate.
[description of drawings]
Fig. 1 is the three-dimensional exploded view of a kind of prior art module backlight.
Fig. 2 is the part light path synoptic diagram of prior art shown in Figure 1 module backlight.
Fig. 3 is the plan view of another prior art module backlight.
Fig. 4 is the stereographic map of the present invention's module first embodiment backlight.
Fig. 5 is the grating distribution schematic diagram of module backlight shown in Figure 4.
Fig. 6 is the network point distribution synoptic diagram of module backlight shown in Figure 4.
Fig. 7 is the stereographic map of the present invention's module second embodiment backlight.
Fig. 8 is the stereographic map of the present invention's module the 3rd embodiment backlight.
Fig. 9 is the network point distribution synoptic diagram of module backlight shown in Figure 8.
[embodiment]
Seeing also Fig. 4, is the present invention's module first embodiment backlight, and this module 100 backlight comprises a plurality of pointolites 110 and a light guide plate 120.This pointolite 110 sends light beam, and the transmission direction that these light guide plate 120 these pointolites 110 of guiding send light beam is converted into the area source outgoing.
This pointolite 210 can be light emitting diode or miniature bulb, and light emitting diode that can be by disposing a plurality of different colours or miniature bulb are to allocate required Show Color and briliancy.
This light guide plate 120 is plate shaped light guide plate, adopts transparent materials such as acryl, glass or polycarbonate to make, and it comprises a light entrance face 121, the light-emitting face 122 that links to each other with light entrance face 121, and light-emitting face 122 opposed bottom surface 123 and side 124.
The light beam that these light entrance face 121 acceptance point light sources 110 send, the zone of the light beam that Coupling point light source 110 sends on it can be provided with anti-reflective film (figure does not show), to improve the light beam utilization factor.
See also Fig. 5, this light-emitting face 122 can be processed into the uneven surface with certain roughness.Because pointolite 110 emitted light beams have specific optical field distribution, therefore district's (indicating) a little less than the zone forms incident intensity between the light guide plate corner of the adjacent light plane of incidence 121 and two pointolites.Distinguish a little less than making light beam fully diffuse into incident intensity, the district is provided with a plurality of gratings 130 a little less than the incident intensity of light guide plate 120 light-emitting faces 122.These a plurality of gratings 130 comprise grating fringe 131 and spacer portion 132, and wherein, this grating fringe 131 is projectioies of many flat shape fixed cycles, can certainly be groove, and this spacer portion 132 is the compartments between the grating fringe 131.The distribution arrangement of the grating fringe 131 of these a plurality of gratings 130 is the beam emissions angular direction that are parallel to pointolite 110.Can change it to influence by size, shape and the spacing of adjusting grating 130 by light.Generally speaking, the width of the width of this grating fringe 131 and spacer portion 132 all should be less than 2 μ m, and the height of grating fringe 131 projectioies is about about 0.5-1.5 μ m.The shape of this grating fringe 131 can be triangle, trapezoidal or rectangle.
See also Fig. 6, the bottom surface 123 of light guide plate 120 is provided with a plurality of sites 140, to improve the briliancy and the homogeneity of light guide plate 120 outgoing beams.The size of this site 140 increases progressively along the direction away from light entrance face 121, and it is cylindric.Certainly, this site 140 also can be spherical shape, square, pyramid or other suitable shape.This site 140 can be distributed in the bottom surface 123 of light guide plate 120 by modes such as printing or ejection formations.In addition, also can be 123 a plurality of V-shaped grooves (figure does not show) be set to substitute these a plurality of sites 140 in the bottom surface.The bottom surface 123 of this light guide plate 120 can be provided with reflectance coating (figure does not show), and this reflectance coating is by SiO
2With TiO
2Alternately the multilayer film that form make projection beam reflection thereon, overflow from the bottom surface 123 of light guide plate 120 to prevent light beam, thus the energy loss of reduction light beam, the whole optical property of raising light guide plate 120.This reflectance coating can adopt methods such as chemical vapour deposition technique, electron beam evaporation plating method, sputtering method to form, and its reflectivity at visible region can reach more than 98%.
Seeing also Fig. 7, is the present invention's module second embodiment backlight, and this module 200 backlight comprises a plurality of pointolites 210 and a light guide plate 220.This light guide plate 220 is wedge shape light guide plate, the bottom surface 223 that comprises a light entrance face 221, tilts to intersect with light entrance face 221, light-emitting face 222 and the side 224 relative with bottom surface 223, these pointolite 210 relative light entrance faces 221 settings.
The a plurality of gratings 230 of the weak district of the incident intensity of these light-emitting face 222 corresponding point light sources 210 (indicating) distribution.These a plurality of grating 230 method for makings commonly used have mechanical scratching method, vacuum coating replica method and holography method etc.The mechanical scratching method is deposition of aluminum or a golden film on the light guide plate base material, and then delineation forms.Be the control shape of grating fringe 231 and grating fringe 231 position, the temperature of the form accuracy of the kinematic accuracy of optical grating graduating machine, cutter and environment, humidity etc. are had relatively high expectations with spacer portion 232.The vacuum coating replica method be the grating made of the mechanical scratching method as master mold, on master mold with vacuum coating method evaporation separating layer and aluminium, then under the bonding agent effect with aluminium attached to the blank of replica grating on and obtain replica grating.Holography method is made grating and is called interferometric method again, is to utilize laser hologram photography to make grating.Closeer with the grating fringe of the grating of mechanical scratching with the grid ratio that holography method is made, interval error is littler.
These a plurality of sites of 223 distributions, bottom surface (figure does not show), the size of this site and density all increase gradually along the direction away from light entrance face 221, in order to improve the homogeneity of light guide plate 220 and module backlight 200 outgoing beams.
Seeing also Fig. 8, is the present invention's module the 3rd embodiment backlight.This module 300 backlight comprises a plurality of pointolites 310 and a light guide plate 320.This light guide plate 320 is plate shaped, it comprise two light entrance faces 321, one with the light entrance face 321 vertical bottom surfaces 323 that link to each other, light-emitting face 322 and the side 324 relative, these pointolite 310 relative these two light entrance faces, 321 settings with bottom surface 323.
A plurality of gratings 330 all distribute in the weak district of the incident intensity of these light-emitting face 322 two ends corresponding point light sources 310 (not indicating).These a plurality of gratings 330 are to utilize femtosecond (10
-15Second) laser is made in light guide plate 320 inside from the 60 different angles irradiation light guide plate of spending to 120 degree 320.These a plurality of gratings 330 have the character of direction of beam propagation to external diffusion, and the light beam that makes pointolite send can reach the phenomenon that reduces even eliminate light guide plate incident blanking bar by this weak district of a plurality of laggard incident intensities of grating 330 diffusions.
See also Fig. 9, these a plurality of sites 340 of 323 distributions, bottom surface.These a plurality of sites 340 are evenly distributed on the bottom surface 323 of this light guide plate 320, and it is cylindric, also can be cubes, round table-like, spherical or rectangular-shaped.The bottom surface 323 of this light guide plate 320 has reflectance coating (indicating), overflows from the bottom surface 323 of light guide plate 320 to prevent light beam, thus the energy loss of reduction light beam, the whole optical property of raising light guide plate 320.Certainly, reflecting plate (figure does not show) also can be set to realize this function in bottom surface 323 1 sides of contiguous light guide plate 320.
Claims (9)
1. module backlight, comprise pointolite and light guide plate, this light guide plate comprises light entrance face, the light-emitting face that intersects with this light entrance face and with the light-emitting face opposed bottom surface, this pointolite emitted light beams enters light guide plate with the specific light field distribution through light entrance face, form the weak district of a plurality of incident intensities, it is characterized in that: this light guide plate also comprises a plurality of gratings that are arranged on light-emitting face, and a plurality of grating pairs answer the weak district of incident intensity to distribute, these a plurality of gratings comprise grating fringe and the spacer portion between grating fringe, this grating fringe and light entrance face tilt to intersect, and form triangle nested against one another.
2. module backlight as claimed in claim 1 is characterized in that: the distribution arrangement of this grating fringe is the beam emissions angular direction that is parallel to pointolite.
3. module backlight as claimed in claim 1 is characterized in that: this grating fringe is the projection in many secured in parallel cycles.
4. module backlight as claimed in claim 3 is characterized in that: the shape of this grating fringe is triangle, trapezoidal or rectangle.
5. module backlight as claimed in claim 3 is characterized in that: the width of this grating fringe and the width of spacer portion are all less than 2 μ m, and the height of grating fringe is 0.5-1.5 μ m.
6. module backlight as claimed in claim 1 is characterized in that: this grating fringe is the groove in many secured in parallel cycles.
7. module backlight as claimed in claim 1 is characterized in that: these a plurality of gratings are to adopt mechanical scratching method, vacuum coating replica method or holography method to make.
8. module backlight as claimed in claim 1 is characterized in that: this pointolite is a light emitting diode.
9. light guide plate, in order to the points of engagement light source, comprise the light entrance face of receiving beam, intersect with light entrance face and the light-emitting face of lead beam outgoing and with the light-emitting face opposed bottom surface, it is characterized in that: this light guide plate also comprises a plurality of gratings that are arranged on light-emitting face, and a plurality of grating pairs answer the weak district of the incident intensity of pointolite to distribute, these a plurality of gratings comprise grating fringe and the spacer portion between grating fringe, this grating fringe and light entrance face tilt to intersect, and form triangle nested against one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031401988A CN100419528C (en) | 2003-08-14 | 2003-08-14 | Back light assembly and its light guide board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031401988A CN100419528C (en) | 2003-08-14 | 2003-08-14 | Back light assembly and its light guide board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1580901A CN1580901A (en) | 2005-02-16 |
| CN100419528C true CN100419528C (en) | 2008-09-17 |
Family
ID=34579271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031401988A Expired - Fee Related CN100419528C (en) | 2003-08-14 | 2003-08-14 | Back light assembly and its light guide board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100419528C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236123A (en) * | 2011-07-04 | 2011-11-09 | 林胜军 | Light guide structure with multiple three-dimensional incident faces |
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| KR101082904B1 (en) | 2004-10-25 | 2011-11-11 | 삼성전자주식회사 | Light guide panel, and back light assembly and display device having the same |
| CN109541840B (en) * | 2011-01-21 | 2022-07-08 | 群创光电股份有限公司 | Liquid crystal panel module and liquid crystal display device |
| CN102182962A (en) * | 2011-04-26 | 2011-09-14 | 苏州向隆塑胶有限公司 | Lighting module |
| US8755007B2 (en) * | 2011-07-01 | 2014-06-17 | Seiko Epson Corporation | Liquid crystal device, electronic apparatus and lighting device |
| CN102331598B (en) * | 2011-09-19 | 2013-05-08 | 苏州向隆塑胶有限公司 | Light guide plate, manufacturing method thereof and light source device |
| CN102621623B (en) * | 2012-04-06 | 2017-02-08 | 深圳市华星光电技术有限公司 | Light guide plate and backlight module group |
| CN104090326A (en) * | 2014-06-11 | 2014-10-08 | 东莞市现代精工实业有限公司 | Light guide plate with uniform light emitting brightness |
| CN104090327A (en) * | 2014-07-28 | 2014-10-08 | 苏州茂立光电科技有限公司 | Light guide plate with light incident side of conical structure |
| CN104501045B (en) * | 2014-12-23 | 2017-02-22 | 苏州茂立光电科技有限公司 | Laterally-incoming-type backlight module and light guide plate thereof |
| CN104749687B (en) * | 2015-04-14 | 2017-12-12 | 武汉华星光电技术有限公司 | Light guide plate and backlight module |
| KR102364848B1 (en) * | 2015-08-20 | 2022-02-18 | 삼성전자주식회사 | Curved backlight unit and curved display apparatus including the same |
| CN105974711B (en) * | 2016-06-29 | 2018-11-27 | 凌云光技术集团有限责任公司 | The conllinear regulating device of light source anti-vibration of line-scan digital camera |
| KR102626224B1 (en) * | 2016-08-31 | 2024-01-17 | 삼성디스플레이 주식회사 | Light emitting module and display device having the same |
| CN106908891A (en) * | 2017-03-02 | 2017-06-30 | 张模辉 | A kind of glass light guide plate and apply its lamination big-power solar cell panel |
| CN107193070B (en) | 2017-08-01 | 2020-07-28 | 京东方科技集团股份有限公司 | Light field modulation layer, backlight structure and display device |
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| JPH0934371A (en) * | 1995-07-17 | 1997-02-07 | Nichia Chem Ind Ltd | Led surface light source |
| JPH0992886A (en) * | 1995-09-26 | 1997-04-04 | Nichia Chem Ind Ltd | Led surface light source |
| JP2001043720A (en) * | 1999-07-28 | 2001-02-16 | Sanyo Electric Co Ltd | Surface light source device and display device |
| US20030086030A1 (en) * | 2001-11-08 | 2003-05-08 | Hitoshi Taniguchi | Backlit lighting device, liquid crystal display device utilizing same, and liquid crystal display device manufacturing method |
-
2003
- 2003-08-14 CN CNB031401988A patent/CN100419528C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0934371A (en) * | 1995-07-17 | 1997-02-07 | Nichia Chem Ind Ltd | Led surface light source |
| JPH0992886A (en) * | 1995-09-26 | 1997-04-04 | Nichia Chem Ind Ltd | Led surface light source |
| JP2001043720A (en) * | 1999-07-28 | 2001-02-16 | Sanyo Electric Co Ltd | Surface light source device and display device |
| US20030086030A1 (en) * | 2001-11-08 | 2003-05-08 | Hitoshi Taniguchi | Backlit lighting device, liquid crystal display device utilizing same, and liquid crystal display device manufacturing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236123A (en) * | 2011-07-04 | 2011-11-09 | 林胜军 | Light guide structure with multiple three-dimensional incident faces |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1580901A (en) | 2005-02-16 |
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