CN1645216A - Back light assembly of liquid crystal device - Google Patents
Back light assembly of liquid crystal device Download PDFInfo
- Publication number
- CN1645216A CN1645216A CN 200510051623 CN200510051623A CN1645216A CN 1645216 A CN1645216 A CN 1645216A CN 200510051623 CN200510051623 CN 200510051623 CN 200510051623 A CN200510051623 A CN 200510051623A CN 1645216 A CN1645216 A CN 1645216A
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- China
- Prior art keywords
- light
- lens
- liquid crystal
- light source
- crystal display
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- 239000004973 liquid crystal related substance Substances 0.000 title claims description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 238000009792 diffusion process Methods 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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- Optical Elements Other Than Lenses (AREA)
Abstract
A back light component consists of a reflection plate, a light source and lens including transmission surface at lens bottom face with its section being top arc form, reflection surface at lens top face with its section being top arc form, two side transmission surface being to be connected to reflection and transmission surfaces, and scattering surface being flange at center of reflection surface.
Description
Technical field
The present invention relates to a kind of light source and lens thereof of backlight assembly, particularly relate to the light source and the lens thereof of the direct type backlight assembly that is used for LCD.
Background technology
Directly-down liquid crystal display backlight assembly is by being installed on many tubes in the dead astern of display panel, and to increase the mode of quantity of light source and then increase luminous flux, the LCD of making large-size makes giant display have enough briliancy.
Consult Fig. 1, backlight assembly 1 has diffusion sheet 11, framework 12, reflector plate 13 and fluorescent tube 14.Diffusion sheet 11 and reflector plate 13 utilize framework 12 fixing, and fluorescent tube 14 is located therein, and emit beam by reflector plate 13 upwards reflection of light again, and light passes diffusion sheet 11 backs and penetrates.Because the fluorescent tube 14 of known backlit assembly 1 is too big with reflector plate 13 light and shade differences, easily cause the phenomenon of background light and shade inequality.If want head it off, then must increase fluorescent tube 14 and diffusion sheet 11 apart from d.Yet, the thickness of LCD will be increased, and can't meet the frivolous requirement of display volume.
In addition, solve the fluorescent tube 14 and the too big problem of reflector plate 13 light and shade differences of backlight assembly 1, also can solve, consult Fig. 2 by increasing diffusion sheet 11a.Also promptly, diffusion sheet 11a on repeating repeatedly on the diffusion sheet 11 originally utilizes the thickness and degree of ruing (Haze) that increase diffusion sheet 11,11a, and the profile of fluorescent tube 14 is broken up, and reaches the uniform purpose of picture briliancy.But, increase diffusion sheet 11a and not only cause cost to increase, the thickness of backlight assembly 1 is increased.Moreover,, overlap after the use, the light source utilization factor is significantly reduced because the light transmission of diffusion sheet 11,11a is low.So will reach the needed briliancy of large-sized monitor, just must use more fluorescent tube 14, and the cost of fluorescent tube 14 is increased.
Summary of the invention
In order to improve above-mentioned shortcoming, the invention provides a kind of backlight liquid crystal display assembly and lens thereof, backlight assembly comprises: a reflector plate, at least one light source that is positioned at the upper surface of this reflector plate, and at least one lens that are positioned at this light source top.These at least one lens comprise a reflecting surface, a transmission plane, two side transmission planes and a scattering surface.This transmission plane be for the bottom surface of these lens and its section be arc on.Upper surface and its section that this reflecting surface is positioned at these lens are last arc.This two sides transmission plane lays respectively at the joint face of this reflecting surface and this transmission plane.And this scattering surface is to be a dome, and this convexity is formed in the middle part of this reflecting surface.Refraction and the reflection of this light source by these lens with the light mean allocation on this light source and this reflecting surface, but reached the effect of backlight assembly uniformly light-emitting.
In addition, lens of the present invention comprise a transmission plane, this transmission plane be for the bottom surface of these lens and its section be arc on; Upper surface and its section that one reflecting surface, this reflecting surface are positioned at these lens are last arc; Two side transmission planes, this two sides transmission plane lays respectively at the joint face of this reflecting surface and this transmission plane side; And a scattering surface, this scattering surface is the dome that is formed at the optical axis position of this reflecting surface for.
For above and other objects of the present invention, feature and advantage can be become apparent, enumerate preferred embodiment below especially, and in conjunction with the accompanying drawings, be described in detail below.
Description of drawings
Fig. 1 is the synoptic diagram for known backlight assembly of liquid crystal display;
Fig. 2 is the synoptic diagram for known backlight assembly of liquid crystal display;
Fig. 3 is the stereoscopic figure for lens of the present invention and light source;
Fig. 4 is the sectional view for Fig. 3 A-A profile line;
Fig. 5 is the light path synoptic diagram for backlight assembly of the present invention.
The reference numeral explanation:
1～backlight assembly 11,11a～diffusion sheet
12～framework, 13～reflector plate
The distance of 14～fluorescent tube d～fluorescent tube 14 and diffusion sheet 11
21～lens, 211～transmission plane
212～reflecting surface, 213～two side transmission planes
214～scattering surface, 215～front-reflection layer
216～back reflection layer, 217～dented space
30～light source, 301～rear side light path
302～front side light path 303～reflected light path
304～directly scattering light paths 305～indirect scattering light path
306～the first side direction light paths, 307～the second side direction light paths
40～reflector plate, 50～diffusion sheet
Embodiment
Consult Fig. 3,4, the bottom surface of lens 21 is to be a transmission plane 211, and the section of this transmission plane 211 is last arc.And the upper surface of these lens 21 has a reflecting surface 212, and this reflecting surface 212 has reflected coat layer, in order to form a front-reflection layer 215 and a back reflection layer 216.And the section of this reflecting surface 212 is to be last arc.Two side transmission planes 213 are the form of half transmitting, and are located at this reflecting surface 212 and this transmission plane 211 sides in the dip plane mode respectively, and connect this reflecting surface 212 and this transmission plane 211.In addition, the middle part of this reflecting surface 212 is provided with the scattering surface 214 of a convexity.And the transmission plane 211 of these lens 21 also comprises a dented space 217 in order to ccontaining light source 30.
In conjunction with consulting Fig. 4,5 figure.Backlight assembly 2 comprises reflector plate 40, at least one light source 30 and lens 21.This light source 30 is located at the upper surface of reflector plate 40, and lens 21 are positioned at the top of the optical axis of light source 30.The detailed structure of these lens 21 discloses in leading portion, and this section repeats no more.In addition, above backlight assembly 2, also be provided with a diffusion sheet 50.
The light that light source 30 of the present invention is sent comprises a rear side light path 301 and a front side light path 302.This rear side light path 301 penetrates towards these reflector plate 40 directions after being launched by this light source 30, penetrates via these reflector plate 40 reflections and towards diffusion sheet 50 directions again.And this front side light path 302 by 30 emissions of this light source after, directly enter in these lens 21.
The front side light path 302 that enters behind the lens 21 comprises a reflected light path 303, one a direct scattered light road 304 and an indirect scattering light path 305.This reflected light path 303 is by this back reflection layer 216 this reflected light path 303 to be reflected towards these reflector plate 40 directions, and this reflector plate 40 reflects this reflected light path 303 again towards this diffusion sheet 50 at last.
And after directly scattering light path 304 enters these lens 21, by this scattering surface 214 should direct scattering light path 304 towards these diffusion sheet 50 direction scatterings.In addition, after scattering light path 305 enters these lens 21 indirectly, should indirect scattering light path 305 scatter on this front-reflection layer 215, should penetrate towards these diffusion sheet 50 directions by indirect scattered beam 305 by this front-reflection layer 215 again by this scattering surface 214.
In addition, because two side transmission planes 213 are forms for half transmitting, so after light source 30 is entered by lens 21, towards the ejaculation of two side transmission planes, 213 directions and directly advance, be the first side direction light path 306 towards diffusion sheet 50 directions.Light path as for returning through two side transmission planes 213 in the lens 21 then is called the second side direction light path 307.
Scioptics 21 of the present invention provide light that light source 30 produced via different light paths, comprise front side light path 302, reflected light path 303, direct scattering light path 304 and indirect scattering light path 305, rear side light path 301, the first side direction light path 306 and the second side direction light path 307, make part light pass through reflector plate 40 to diffusion sheet 50 direction transmission, so just can dwindle the briliancy difference between light source 30 and the reflector plate 40, make the light source of background more even.
Though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; certainly can do various changes and retouching, thus protection scope of the present invention should with claims scope was defined is as the criterion.
Claims (10)
1. backlight liquid crystal display assembly comprises at least:
One reflector plate;
At least one light source that is positioned at the upper surface of this reflector plate; And
At least one lens that are positioned at this at least one light source top, these lens comprise a reflecting surface, a transmission plane, two side transmission planes and a scattering surface, this transmission plane be for the bottom surface of these lens and its section be arc on, upper surface and its section that this reflecting surface is positioned at these lens are last arc, this two sides transmission plane lays respectively at the joint face of this reflecting surface and this transmission plane, and this scattering surface is to be a dome, and this convexity is formed in the optical axis position of this reflecting surface.
2. backlight liquid crystal display assembly as claimed in claim 1 is characterized in that: the reflecting surface of these lens has reflected coat layer, and this reflected coat layer is in order to form a front-reflection layer and a back reflection layer.
3. backlight liquid crystal display assembly as claimed in claim 1 is characterized in that: two side transmission planes of these lens are the forms for half transmitting.
4. backlight liquid crystal display assembly as claimed in claim 1 is characterized in that: the middle part of the transmission plane of these lens also comprises a dented space in order to ccontaining this light source.
5. backlight liquid crystal display assembly as claimed in claim 1 is characterized in that: the light that this light source sent comprises a rear side light path, penetrates towards this reflector plate direction after this this light emitted of rear side optical routing, forms via this reflector plate reflection again.
6. backlight liquid crystal display assembly as claimed in claim 1 is characterized in that: the light that this light source sent comprises a front side light path, directly enters after this this light emitted of front side optical routing in these lens and forms.
7. backlight liquid crystal display assembly as claimed in claim 6 is characterized in that: this front side light path comprises a reflected light path, a direct scattered light road and an indirect scattering light path.
8. backlight liquid crystal display assembly as claimed in claim 7, it is characterized in that: this reflected light path is directly by the back reflection layer of these lens this reflected light path to be reflected towards this reflector plate direction by the light that this light source is launched, and this light is formed towards this diffusion sheet reflection again.
9. backlight liquid crystal display assembly as claimed in claim 7 is characterized in that: this direct scattering light path is directly to be entered in these lens by the light that this light source is launched, and by this scattering surface this light is formed towards this light source top scattering.
10. backlight liquid crystal display assembly as claimed in claim 7, it is characterized in that: this indirect scattering light path is directly to be entered in these lens by the light that this light source is launched, by this scattering surface with this light scatter to this front-reflection layer, again by this front-reflection layer with this light towards this light source top direction penetrate form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100516232A CN100350313C (en) | 2005-02-08 | 2005-02-08 | Back light assembly of liquid crystal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100516232A CN100350313C (en) | 2005-02-08 | 2005-02-08 | Back light assembly of liquid crystal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1645216A true CN1645216A (en) | 2005-07-27 |
| CN100350313C CN100350313C (en) | 2007-11-21 |
Family
ID=34876608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100516232A Expired - Fee Related CN100350313C (en) | 2005-02-08 | 2005-02-08 | Back light assembly of liquid crystal device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100350313C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426089C (en) * | 2006-11-16 | 2008-10-15 | 友达光电股份有限公司 | Display and its lens |
| CN103017085A (en) * | 2012-12-14 | 2013-04-03 | 京东方科技集团股份有限公司 | Reflecting lens, backlight module using reflecting lens and display device |
| CN104062803A (en) * | 2013-03-21 | 2014-09-24 | 三星电子株式会社 | Backlight Unit And Display Device Having Same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002093202A (en) * | 2000-09-13 | 2002-03-29 | Ryoden Trading Co Ltd | Surface light emitting back light device and method of manufacturing it |
| US6679621B2 (en) * | 2002-06-24 | 2004-01-20 | Lumileds Lighting U.S., Llc | Side emitting LED and lens |
| CN1504803A (en) * | 2002-11-29 | 2004-06-16 | 鸿富锦精密工业（深圳）有限公司 | Backlight source and liquid crystal display device |
| CN100370337C (en) * | 2003-07-04 | 2008-02-20 | 鸿富锦精密工业（深圳）有限公司 | Straight down type backlight module |
-
2005
- 2005-02-08 CN CNB2005100516232A patent/CN100350313C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426089C (en) * | 2006-11-16 | 2008-10-15 | 友达光电股份有限公司 | Display and its lens |
| CN103017085A (en) * | 2012-12-14 | 2013-04-03 | 京东方科技集团股份有限公司 | Reflecting lens, backlight module using reflecting lens and display device |
| CN104062803A (en) * | 2013-03-21 | 2014-09-24 | 三星电子株式会社 | Backlight Unit And Display Device Having Same |
| CN104062803B (en) * | 2013-03-21 | 2020-03-13 | 三星电子株式会社 | Backlight unit of display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100350313C (en) | 2007-11-21 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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Granted publication date: 20071121 |