CN1580900A - Back light assembly - Google Patents
Back light assembly Download PDFInfo
- Publication number
- CN1580900A CN1580900A CN 03140195 CN03140195A CN1580900A CN 1580900 A CN1580900 A CN 1580900A CN 03140195 CN03140195 CN 03140195 CN 03140195 A CN03140195 A CN 03140195A CN 1580900 A CN1580900 A CN 1580900A
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- CN
- China
- Prior art keywords
- prism
- module backlight
- led light
- guide plate
- light guide
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- 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.)
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Abstract
The present invention relates to a backlight module. It includes at least two LED light sources and a light-conducting plate. Said light-conducting plate includes at least a light incident face, a light emerging face and a bottom face. Said bottom face is perpendicular to the light incident face and opposite to said light emerging face, and said at least two LED light sources are placed oppositely to said at least one light incident face, and said light emerging face has several prismatic structures perpendicular to the light incident face. the prismatic period of said prismatic structure is constant. Besides, said invention also provides the distributed mode of said prismatic structure.
Description
[technical field]
The present invention relates to a kind of module backlight.
[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.
Seeing also Fig. 1, is a kind of module backlight 1 of prior art, and this module 1 backlight comprises two led light sources 11, a reflecting plate 12, a light guide plate 13, a diffuser plate 14 and a blast sheet 15.This light guide plate 13 is roughly plate shaped, and it comprises an incidence surface 131, a bottom surface 133 and an exiting surface 132.Wherein this light source 11 is incidence surface 131 settings with respect to light guide plate 13, and this reflecting plate 12, light guide plate 13, diffuser plate 14 and blast sheet 15 stack gradually placement.The light beam that sends by light source 11, this blast sheet 15 of guiding after light guide plate 13, reflecting plate 12 and diffuser plate 14 effects, these blast sheet 15 surfaces are evenly distributed with a plurality of parallel prism structures 151, and this prism structure 151 is assembled this light beam and directed toward display panel (figure does not show).But more and each element of the component number that this module backlight 1 adopts all is discrete, so optical energy loss is bigger, and this module 1 bright dipping briliancy backlight is lower, and the price of blast sheet 15 is higher, causes this module 1 cost backlight higher.
See also Fig. 2, for overcoming above-mentioned shortcoming, prior art provides another kind of module backlight 2, and this module 2 backlight comprises two led light sources 21, a reflecting plate 23 and a light guide plate 20.The a plurality of prism structures 222 of distribution on the exiting surface 202 of this light guide plate 20, the bottom surface 203 of this light guide plate 20 is distributed with lattice point structure 221.Wherein this light source 21 is incidence surface 201 settings with respect to light guide plate 20, this reflecting plate 23, light guide plate 20 stacked placements.The module backlight 2 of this kind structure can save blast sheet cost, but, the prism structure 222 that cause is arranged in parallel is integrally formed with the transparency carrier 22 of light guide plate 20, prism structure 222 is uniformly distributed in light guide plate 20 surfaces, prism structure 222 has only the optically focused effect, can't change the luminance difference of light source near-end and far-end, thereby uniformity coefficient is relatively poor, and between two light sources, easily form blanking bar, influence visual effect.
[summary of the invention]
For overcoming the relatively poor problem of module outgoing light homogeneity backlight in the prior art, the invention provides the module backlight of the higher outgoing light homogeneity of a kind of tool.
The present invention solves the technical scheme that the prior art problem adopted: a kind of module backlight is provided, it comprises at least two led light sources and a light guide plate, this light guide plate comprises at least one incidence surface, one exiting surface and a bottom surface, this bottom surface is vertical with incidence surface and relative with exiting surface, this at least one incidence surface setting relatively of these at least two led light sources, this exiting surface has a plurality of prism structures vertical with incidence surface, the prism constant period of this prism structure, wherein, the distribution mode of this prism structure is: the prism width of two pairing prism structures in led light source position equates that with the prism cycle prism width from these two led light source positions to these two pairing prism structures in led light source centre position reduces gradually.
Compared to prior art, the present invention has following advantage: the light guide plate exiting surface of the present invention's module backlight has a plurality of prism structures vertical with incidence surface, the prism constant period of this prism structure, the prism width diminishes between corresponding two led light sources, this structure can reduce the blanking bar district, thereby improve the outgoing light homogeneity of this exiting surface, and then 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 the stereographic map of another kind of prior art module backlight.
Fig. 3 is prior art LED light intensity polar coordinates distribution plans.
Fig. 4 is the stereographic map of the present invention's module first embodiment backlight.
Fig. 5 is the front view of module backlight shown in Figure 4.
Fig. 6 is the front view of the present invention's module second embodiment backlight.
Fig. 7 is a LED light intensity polar coordinates distribution plan of the present invention.
[embodiment]
Please consulting Fig. 4 and Fig. 5 together, is respectively the stereographic map and the front view of the present invention's module first embodiment backlight.This module 3 backlight comprises two led light sources 31 and a light guide plate 30.Wherein, this light guide plate 30 is in order to receive the light beam that sends from these two led light sources 31 and with its derivation, its have an incidence surface 301, an exiting surface 302 vertical with one with incidence surface 301 and with exiting surface 302 opposed bottom surface 303, this bottom surface 303 evenly is provided with a plurality of sites 34.
Wherein, this exiting surface 302 has a plurality of prism structures vertical with incidence surface 33, the prism period T of this prism structure 33 is constant, the prism width B changes, its distribution mode is: the prism width B of two led light source 31 pairing prism structures equals the prism period T, the prism width of the corresponding prism structure of institute reduces gradually in the middle of from these two led light sources 31 to these two led light sources, and the prism width of minimum is 1/3 of a prism period T.
These two led light sources, 31 relative these incidence surfaces 301 are provided with, and this incidence surface 301 is in order to receive this two light beams that led light source 31 is sent, and derive by exiting surface 302 this beam divergence, reflection back guiding exiting surface 302 this bottom surface 303 with this light beam.
Because the light harvesting effect of prism structure 33 is the principle of linear approximate relationship with the ratio of prism period T and prism width B, by the correction of said structure to the LED light beam, can form LED equivalence light path synoptic diagram as shown in Figure 7, compare the back light module unit structure of prior art, light beam more concentrated (with reference to Fig. 3), the beam brightness between light source strengthens, therefore, can reduce the blanking bar district, and effectively improve the outgoing light homogeneity of module backlight.
Seeing also Fig. 6, is the front view of the present invention's module second embodiment backlight.This module 4 backlight comprises three led light sources 41 and a light guide plate 40.Wherein, this light guide plate 40 is in order to receive the light beam that sends from these three led light sources 41 and with its derivation, its have an incidence surface 401, an exiting surface 402 vertical with one with incidence surface 401 and with exiting surface 402 opposed bottom surface 403, this bottom surface 403 evenly is provided with a plurality of sites 44.
Wherein, this exiting surface 402 has the vertical prism structure 43 of a plurality of and incidence surface 401, the prism period T of this prism structure 43 is constant, the prism width B changes, its distribution mode is: the prism width B of two adjacent LED light source 41 pairing prism structures equals the prism period T, the prism width B of the corresponding prism structure of institute reduces gradually in the middle of from these two led light sources 41 to these two led light sources, and the prism width B of minimum is 1/3 of a prism period T.
These three led light sources, 41 relative these incidence surfaces 401 are provided with, and this incidence surface 401 is in order to receive this three light beams that led light source 41 is sent, and derive by exiting surface 402 this beam divergence, reflection back guiding exiting surface 402 this bottom surface 403 with this light beam.
Because the light harvesting effect of prism structure 43 is the principle of linear approximate relationship with the ratio of prism period T and prism width B, by the correction of said structure to the LED light beam, can form LED equivalence light path synoptic diagram as shown in Figure 7, compare the back light module unit structure of prior art, light beam more concentrated (with reference to Fig. 3), the beam brightness between light source strengthens, therefore, can reduce the blanking bar district, and effectively improve the outgoing light homogeneity of module backlight.
The material that adopt the set a plurality of site of the bottom surface of light guide plate of the present invention's module backlight 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 relatively simultaneously, and this reflecting plate can be gone into light guide plate with the beam reflection that light guide plate is leaked, and improves the briliancy of light guide plate exiting surface.This reflecting plate also can be a reflectance coating, and this reflectance coating pastes the bottom surface in light guide plate.And the bottom surface of this light guide plate also can tilt to intersect with incidence surface.The led light source quantity of module backlight also can be more than three.
Claims (9)
1. module backlight, it comprises at least two led light sources and a light guide plate, this light guide plate comprises at least one incidence surface, one exiting surface and a bottom surface, this bottom surface is vertical with incidence surface and relative with exiting surface, this at least one incidence surface setting relatively of these at least two led light sources, this exiting surface has a plurality of prism structures vertical with incidence surface, the prism constant period of this prism structure, it is characterized in that: the distribution mode of this prism structure is: the prism width of two pairing prism structures in led light source position equates that with the prism cycle prism width from these two led light source positions to these two pairing prism structures in led light source centre position reduces gradually.
2. module backlight as claimed in claim 1 is characterized in that: the prism structure of these two pairing light guide plate exiting surfaces in led light source centre position, its prism width minimum value is 1/3 of the prism cycle.
3. 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.
4. 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.
5. module backlight as claimed in claim 1 is characterized in that: this bottom surface is perpendicular to incidence surface.
6. module backlight as claimed in claim 1 is characterized in that: this bottom surface is evenly distributed with a plurality of sites.
7. module backlight as claimed in claim 1 is characterized in that: this bottom surface and incidence surface tilt to intersect.
8. module backlight as claimed in claim 1 is characterized in that: this bottom surface is distributed with a plurality of sites, and the distribution of these a plurality of sites is along becoming close gradually away from the incidence surface direction.
9. module backlight as claimed in claim 1 is characterized in that: this bottom surface is distributed with a plurality of sites, and these a plurality of sites are along becoming big gradually away from the incidence surface direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031401953A CN100376978C (en) | 2003-08-14 | 2003-08-14 | Back light assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031401953A CN100376978C (en) | 2003-08-14 | 2003-08-14 | Back light assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1580900A true CN1580900A (en) | 2005-02-16 |
| CN100376978C CN100376978C (en) | 2008-03-26 |
Family
ID=34579268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031401953A Expired - Fee Related CN100376978C (en) | 2003-08-14 | 2003-08-14 | Back light assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100376978C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100498454C (en) * | 2005-10-28 | 2009-06-10 | 鸿富锦精密工业（深圳）有限公司 | Backlight module set and its light guide plate |
| CN104409052A (en) * | 2014-12-12 | 2015-03-11 | 京东方科技集团股份有限公司 | 3D display backlight module, control method thereof and 3D display |
| CN105372743A (en) * | 2015-11-13 | 2016-03-02 | 重庆鑫翎创福光电科技股份有限公司 | PS light guide plate with light-out microprism structure |
| CN105372740A (en) * | 2015-11-13 | 2016-03-02 | 重庆鑫翎创福光电科技股份有限公司 | PMMA light guide plate with light-out microprism structure |
| CN108931836A (en) * | 2018-08-17 | 2018-12-04 | 京东方科技集团股份有限公司 | Light guide plate and determining method, backlight, display device, readable storage medium storing program for executing |
| WO2023168826A1 (en) * | 2022-03-11 | 2023-09-14 | 瑞仪光电(苏州)有限公司 | Corner brightness surge phenomenon suppressing backlight module, and display apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112859435A (en) * | 2021-01-12 | 2021-05-28 | 扬昕科技(苏州)有限公司 | Light guide plate and light source module |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5359691A (en) * | 1992-10-08 | 1994-10-25 | Briteview Technologies | Backlighting system with a multi-reflection light injection system and using microprisms |
| JPH10160938A (en) * | 1996-11-29 | 1998-06-19 | Toshiba Lighting & Technol Corp | Light guide unit, back light, and lighting device using the same |
| JPH10282496A (en) * | 1997-02-07 | 1998-10-23 | Sanyo Electric Co Ltd | Light transmission body, production of light transmission body and surface light source |
| US5999685A (en) * | 1997-02-07 | 1999-12-07 | Sanyo Electric Co., Ltd. | Light guide plate and surface light source using the light guide plate |
| JPH10268304A (en) * | 1997-03-26 | 1998-10-09 | Dainippon Printing Co Ltd | Back light device and liquid crystal display device |
| JP3316441B2 (en) * | 1997-12-11 | 2002-08-19 | 三洋電機株式会社 | Light guide plate, surface light source using the light guide plate, liquid crystal display device, and method of manufacturing light guide plate |
| JPH11142843A (en) * | 1997-11-05 | 1999-05-28 | Toshiba Chem Corp | Back light device |
| JP4360701B2 (en) * | 1998-06-19 | 2009-11-11 | 日本ライツ株式会社 | Flat lighting device |
| CN2341165Y (en) * | 1998-09-10 | 1999-09-29 | 台湾光宝电子股份有限公司 | Background plate with different prisms optical induction structure |
-
2003
- 2003-08-14 CN CNB031401953A patent/CN100376978C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100498454C (en) * | 2005-10-28 | 2009-06-10 | 鸿富锦精密工业（深圳）有限公司 | Backlight module set and its light guide plate |
| CN104409052A (en) * | 2014-12-12 | 2015-03-11 | 京东方科技集团股份有限公司 | 3D display backlight module, control method thereof and 3D display |
| CN105372743A (en) * | 2015-11-13 | 2016-03-02 | 重庆鑫翎创福光电科技股份有限公司 | PS light guide plate with light-out microprism structure |
| CN105372740A (en) * | 2015-11-13 | 2016-03-02 | 重庆鑫翎创福光电科技股份有限公司 | PMMA light guide plate with light-out microprism structure |
| CN108931836A (en) * | 2018-08-17 | 2018-12-04 | 京东方科技集团股份有限公司 | Light guide plate and determining method, backlight, display device, readable storage medium storing program for executing |
| CN108931836B (en) * | 2018-08-17 | 2020-07-03 | 京东方科技集团股份有限公司 | Light guide plate, backlight source, display device and readable storage medium |
| WO2023168826A1 (en) * | 2022-03-11 | 2023-09-14 | 瑞仪光电(苏州)有限公司 | Corner brightness surge phenomenon suppressing backlight module, and display apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100376978C (en) | 2008-03-26 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080326 Termination date: 20160814 |