CN100437290C - Back light module - Google Patents
Back light module Download PDFInfo
- Publication number
- CN100437290C CN100437290C CNB2003101118591A CN200310111859A CN100437290C CN 100437290 C CN100437290 C CN 100437290C CN B2003101118591 A CNB2003101118591 A CN B2003101118591A CN 200310111859 A CN200310111859 A CN 200310111859A CN 100437290 C CN100437290 C CN 100437290C
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- Prior art keywords
- module backlight
- guide plate
- groove
- pointolite
- light
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Abstract
The present invention relates to a back light module which comprises at least one point light source and a light guide plate, wherein the light guide plate comprises at least one light incident surface and one light exit surface, the point light source is arranged correspondingly to the light incident surface, a plurality of grooves are arranged on the light exit surface near the light incident surface, and the distance between every two grooves near the point light source is larger than the distance between every two grooves far from the point light source.
Description
[technical field]
The invention relates to a kind of module backlight, particularly about a kind of backlight liquid crystal display module that is applied to.
[background technology]
LCD 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 module or preceding optical mode group, this backlight or preceding optical mode group can realize Presentation Function with the beam direction display panel that external light source sent.
See also Fig. 1, be that a patent No. is 6,072, the module backlight 1 of a kind of prior art that United States Patent (USP) disclosed of 551, this module 1 backlight comprises at least one pointolite 11, a reflex housing 12, a light guide plate 13, close pointolite 11 places of this light guide plate exiting surface 132 have a plurality of equally spaced grooves 135, and this groove 135 is used to converge the incident light that enters light guide plate 11, make from the light of this exit facet 132 outgoing more concentrated.
Seeing also Fig. 2, is the light intensity polar coordinates distribution plan of pointolite 11.The light intensity maximum of these pointolite 11 emergent light center sections, the light intensity from the centre to both sides weakens gradually, so the emergent light energy of this pointolite 11 is circular cone distribution.Please consult Fig. 3 together, promptly the emergent light of two pointolites 11 is at the energy distribution synoptic diagram of light guide plate 13 space planes 200.When the emergent light of this pointolite 11 is incident to a space plane 200, the zone 261,262 and 263 that this space plane 200 can exist emergent light to arrive, this zone 261,262 and 263 is commonly called the blanking bar district.Therefore in Fig. 1, though the exiting surface 132 of light guide plate 13 has a plurality of grooves 135, this groove 135 can still can't be eliminated the blanking bar district by converging beam, can there be blanking bar district (figure does not show) in part near the pointolite non-direct projection in 11 places in this light guide plate 13, cause also having the blanking bar district, thereby influence the outgoing light homogeneity of module 1 backlight with the corresponding light guide plate exiting surface in blanking bar district.
[summary of the invention]
In order to overcome the relatively poor problem of module outgoing light homogeneity backlight in the prior art, the invention provides the higher module backlight of a kind of outgoing light homogeneity.
The present invention solves the technical scheme that existing issue adopts: module backlight of the present invention comprises an at least one pointolite and a light guide plate, this light guide plate comprises that at least one incidence surface reaches and an exiting surface of the adjacent setting of this incidence surface, this at least one incidence surface setting relatively respectively of this at least one pointolite, the close incidence surface place of this exiting surface has a plurality of grooves, wherein, spacing is greater than spacing between the groove at point of distance light source place between the close groove at pointolite place, should be 120 μ m near width between the groove at pointolite place, width be 70 μ m between the groove at point of distance light source place.
Compared to prior art, because the light guide plate exiting surface of the present invention's module backlight has a plurality of grooves vertical with incidence surface, and this groove is different with the distance of pointolite, its arrangement mode is also different, near spacing broad between the groove at pointolite place, spacing is narrower between the groove at point of distance light source place, this kind design can make the light beam that is near the pointolite place more concentrated than the light beam at point of distance light source place, this structure can weaken the blanking bar of light guide plate thus, the light and shade difference is further dwindled, thereby improve the outgoing light homogeneity of module backlight.
[description of drawings]
Fig. 1 is the three-dimensional exploded view of a kind of prior art module backlight.
Fig. 2 is pointolite light intensity polar coordinates distribution plans.
Fig. 3 is the light path synoptic diagram of the module backlight of Fig. 1.
Fig. 4 is the stereographic map of the present invention's module first embodiment backlight.
Fig. 5 is the side view of the present invention's module first embodiment backlight.
Fig. 6 is the stereographic map of the present invention's module second embodiment backlight.
[embodiment]
Seeing also Fig. 4 and Fig. 5, is respectively the stereographic map and the side view of the present invention's module first embodiment backlight.This module 3 backlight comprises a pointolite 31 and a light guide plate 33.Wherein, this light guide plate 33 is used to receive the light beam that sends from this pointolite 31 and with its derivation, its have an incidence surface 331, an exiting surface 332 vertical with one with incidence surface 331 and and exiting surface 332 opposed bottom surface 333, this bottom surface 333 evenly is provided with a plurality of sites 3331, these a plurality of sites 3331 are the light generation scatterings that are incident to this bottom surface 333 in order to make, thereby the light of exit facet 332 can evenly be penetrated.Wherein, the close incidence surface place of this exiting surface 332 has a plurality of grooves 3321, spacing L is greater than spacing H between the groove of point of distance light source 31 places (being the blanking bar district) between the close groove 3321 at pointolite 31 places (being the bright band district), this groove 3321 can be straight-line groove or arc groove, its cross section is that V-arrangement also can be a U-shaped, wherein, best design is to adopt arc groove and camber line flute length 3mm, degree of depth 30m, width 60 μ m, the arc groove respective radius is 10cm, arc groove in the bright band zone each other spacing be 120 μ m, spacing is 70 μ m each other in the blanking bar zone.This kind design is in order to reduce the difference between the light and shade, the groove of dark space is bigger than the groove density in area pellucida, big more its light harvesting effect of groove density is strong more, thereby the light harvesting effect that makes the dark space is used for compensating difference in brightness problem between the light and shade greater than the light harvesting in area pellucida, reaches the outgoing light homogeneity that suppresses blanking bar and improve module 3 backlight.Groove 3321 arrangement modes of exiting surface of the present invention also can reduce to point of distance light source place from close pointolite gradually for spacing between the groove.
Seeing also Fig. 6, is the stereographic map of the present invention's module second embodiment backlight.This module 4 backlight comprises a light guide plate 43 and lays respectively at a plurality of pointolites 41 of these light guide plate 43 both sides.Wherein, this light guide plate 43 is to be used to receive the light beam that sends from this pointolite 41 and with its derivation, it has two incidence surfaces 431 and an exiting surface 432, and this bottom surface 433 evenly is provided with a plurality of sites (figure does not show).These pointolite 41 relative these incidence surfaces 431 are provided with, and this two incidence surface 431 is used to receive the light beam that this pointolite 41 is sent, and derive by exiting surface 432 this beam divergence, reflection back guiding exiting surface 432 this bottom surface 433 with this light beam.Wherein, the close incidence surface place of this exiting surface 432 has a plurality of grooves 4321, these a plurality of grooves 4321 can be that straight-line groove also can be an arc groove, but best design is that employing arc groove and its length are 3mm, the degree of depth is 30 μ m, and width is 60 μ m, and the arc groove respective radius is 10cm, bright band zone arc groove each other spacing be 120 μ m, blanking bar zone arc groove each other spacing be 70 μ m.Compared to the module backlight of prior art, module backlight of the present invention can reduce the luminance difference distance between blanking bar and the bright band, thereby improves the outgoing light homogeneity of module backlight.
This groove 3321,4321 length can be according to size and the expanded range of dark space or the length of dwindling line segment of light guide plate, the width and the degree of depth, because blanking bar, the far and near gap of bright band and light source equally also exists briliancy difference between the blanking bar and the briliancy difference between the bright band, therefore, on the basis that width is little between the blanking bar zone is than bright band zone, the blanking bar zone than the dark areas middle conductor between spacing can suitably narrow down, the bright band zone than the bright area middle conductor between spacing can suitably broaden, thereby dwindle brighter place with than the briliancy difference of dark place, and then improve the outgoing light homogeneity of module backlight.
The material that adopt the set a plurality of site of bottom surface of light guide plate of the present invention is high diverging light material, and its shape can be circular, square or rhombus, and its distribution mode also can be along increasing its size or density gradually away from incidence surface.The bottom surface of light guide plate is provided with a reflecting plate (figure does not show) relatively simultaneously, and the beam reflection that this reflecting plate leaks light guide plate is gone into light guide plate, improves the briliancy of light guide plate exiting surface.This reflecting plate is reflectance coating also, and this reflectance coating pastes the bottom surface in light guide plate.In addition, the bottom surface of this light guide plate also can tilt to intersect with incidence surface.The pointolite quantity of module backlight can increase or reduce pointolite quantity according to the size of light guide plate.The pointolite that is adopted among the present invention be light emitting diode (Light Emitting Diode, LED).
Claims (8)
1. module backlight, it comprises an at least one pointolite and a light guide plate, this light guide plate comprises that at least one incidence surface reaches and an exiting surface of the adjacent setting of this incidence surface, this at least one incidence surface setting relatively respectively of this at least one pointolite, the close incidence surface place of this exiting surface has a plurality of grooves, it is characterized in that: spacing is greater than spacing between the groove at point of distance light source place between the close groove at pointolite place, should be 120 μ m near width between the groove at pointolite place, width be 70 μ m between the groove at point of distance light source place.
2. module backlight as claimed in claim 1 is characterized in that: this groove is an arc groove.
3. module backlight as claimed in claim 2, wherein this camber line flute length is 3mm, and the degree of depth is 30 μ m, and width is 60 μ m, and the arc groove respective radius is 10cm.
4. module backlight as claimed in claim 1 is characterized in that: this light guide plate further comprises a bottom surface, and this bottom surface is perpendicular to incidence surface and relative with exiting surface, and this bottom surface is distributed with a plurality of sites.
5. module backlight as claimed in claim 4 is characterized in that: the shape of this site is along becoming big gradually away from the incidence surface direction.
6. module backlight as claimed in claim 1 is characterized in that: this module backlight further comprises a reflecting plate, and the bottom surface of the contiguous light guide plate of this reflecting plate is provided with.
7. module backlight as claimed in claim 1 is characterized in that: this module backlight further comprises a reflectance coating, and this reflectance coating is covered on the bottom surface of light guide plate.
8. module backlight as claimed in claim 1 is characterized in that: this pointolite is a light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101118591A CN100437290C (en) | 2003-10-18 | 2003-10-18 | Back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101118591A CN100437290C (en) | 2003-10-18 | 2003-10-18 | Back light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1609681A CN1609681A (en) | 2005-04-27 |
| CN100437290C true CN100437290C (en) | 2008-11-26 |
Family
ID=34759491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101118591A Expired - Fee Related CN100437290C (en) | 2003-10-18 | 2003-10-18 | Back light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100437290C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101866244B1 (en) * | 2011-01-17 | 2018-06-12 | 삼성전자주식회사 | Scanning backlight unit and liquid crystal display having the same |
| US9442240B2 (en) | 2012-03-16 | 2016-09-13 | Radiant Opto-Electronics Corporation | Light guide plate and light source module |
| TWI481915B (en) | 2013-08-20 | 2015-04-21 | Radiant Opto Electronics Corp | Light guide plate with multidirectional structures |
| TWI457622B (en) * | 2012-03-16 | 2014-10-21 | Radiant Opto Electronics Corp | Light guide plate and backlight module |
| US9223079B2 (en) | 2012-03-16 | 2015-12-29 | Radiant Opto-Electronics Corporation | Light guide plate and backlight module |
| JP5915556B2 (en) * | 2013-01-30 | 2016-05-11 | オムロン株式会社 | Light guide plate |
| 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 |
| DE102017130790A1 (en) * | 2017-12-20 | 2019-06-27 | Itz Innovations- Und Technologiezentrum Gmbh | Flat or rod-shaped light guide element |
| CN114815036B (en) * | 2022-05-20 | 2024-05-31 | 深圳市高亮光光电科技有限公司 | Light guide plate, light guide plate assembly and light guide plate manufacturing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301977A (en) * | 1999-12-28 | 2001-07-04 | 富士通化成株式会社 | Lighting device |
| JP2001255415A (en) * | 2000-03-09 | 2001-09-21 | Citizen Electronics Co Ltd | Light guide plate |
| JP2002042534A (en) * | 2000-07-31 | 2002-02-08 | Nichia Chem Ind Ltd | Light-emitting device |
| CN2496052Y (en) * | 2001-04-13 | 2002-06-19 | 宋义 | Improved, uniform and high efficiency side lighting type back light source |
-
2003
- 2003-10-18 CN CNB2003101118591A patent/CN100437290C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301977A (en) * | 1999-12-28 | 2001-07-04 | 富士通化成株式会社 | Lighting device |
| JP2001255415A (en) * | 2000-03-09 | 2001-09-21 | Citizen Electronics Co Ltd | Light guide plate |
| JP2002042534A (en) * | 2000-07-31 | 2002-02-08 | Nichia Chem Ind Ltd | Light-emitting device |
| CN2496052Y (en) * | 2001-04-13 | 2002-06-19 | 宋义 | Improved, uniform and high efficiency side lighting type back light source |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1609681A (en) | 2005-04-27 |
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| PB01 | Publication | ||
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20081126 Termination date: 20151018 |
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