CN1645217A - Disk lens and dot light source of back light assembly - Google Patents
Disk lens and dot light source of back light assembly Download PDFInfo
- Publication number
- CN1645217A CN1645217A CN 200510051624 CN200510051624A CN1645217A CN 1645217 A CN1645217 A CN 1645217A CN 200510051624 CN200510051624 CN 200510051624 CN 200510051624 A CN200510051624 A CN 200510051624A CN 1645217 A CN1645217 A CN 1645217A
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- Prior art keywords
- light
- backlight assembly
- point source
- lens
- scattering
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- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 238000009792 diffusion process Methods 0.000 claims description 24
- 239000004065 semiconductor Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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Abstract
A back light component consists of a reflection plate a point light source and dished 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, ring side edge connecting to side edges of reflection and transmission surfaces, and scattering surface being flange at center of reflection surface. The dished lens and luminous semiconductor component are packaged to form a LED component for providing uniform back light.
Description
Technical field
The present invention relates to a kind of light source and lens thereof of backlight assembly, particularly relate to the point source of light and the disk lens thereof of the direct type backlight assembly that is used for LCD.
Background technology
Progress along with process conditions, light emitting diode (LED, light emitting diode) luminescence efficiency and luminous power all have significant progress, therefore light emitting diode be applied to the backlight liquid crystal display assembly therefrom, undersized side light inlet mode, towards use light emitting diode matrix (LED array) in, large-scale direct type backlight assembly.Because the emphasis of direct type backlight assembly maximum is exactly that the light source profile is eliminated, make the briliancy of picture can be more even.Yet, because light emitting diode is a pointolite,, solve in the mode that increases backlight assembly thickness usually if will eliminate the luminance nonuniformity that the light source profile causes, for example increase the distance of light source and diffusion sheet, or increase the thickness and the vaporific degree (Haze) of diffusion sheet.
Consult Fig. 1, backlight assembly 1 has diffusion sheet 11, reflector plate 13 and point source of light 14.Point source of light 14 is located between diffusion sheet 11 and the reflector plate 13, and the part light that it sent with upwards reflection of light, passes through diffusion sheet 11 to eliminate the profile of point source of light 14 by reflector plate 13 again.
The problem of known backlit assembly 1 is, point source of light 14 is too big with the reflector plate 13 light and shade differences of background, if want the head it off then must increasing with point source of light 14 and diffusion sheet 11 apart from d, so design can make the thickness of LCD increase, and the idea frivolous with present pursuit display volume runs in the opposite direction.
Consult Fig. 2 again, solve the point source of light 14 of backlight assembly 1 and the too big problem of reflector plate 13 light and shade differences of background, also can be by increasing the method for diffusion sheet 11a.Also promptly, diffusion sheet 11a on repeating repeatedly on the script diffusion sheet 11 utilizes the thickness that increases diffusion sheet 11,11a, and the profile of point source of light 14 is broken up, and reaches the uniform purpose of picture briliancy.But, increase diffusion sheet 11a cost is increased, the thickness of backlight assembly 1 is increased.Moreover,, overlap after the use, the efficiency of light energy utilization is more reduced because the light transmission of diffusion sheet 11,11a is low.Just must use more point source of light 14 so will reach the needed briliancy of large-sized monitor.
In addition, consult Fig. 3, this figure is the embodiment of No. the 6679621st, U.S. Patent number " SIDE EMITTING LEDAND LENS " patent specification.Lens 15 comprise second parts 152 that are funnel shaped first parts 151 and are located at the lens below, wherein first parts 151 are provided with a reflecting surface 153 and one first plane of refraction 154, have second plane of refraction 155 of a circular arc and the bottom surface 156 of a circular arc on second parts 152, when the light emitting diode (not shown) is located at the L point, the light that light emitting diode sent can pass bottom surface 156 and enter in the lens 15, after arriving reflecting surface 153, light can be to first plane of refraction, the 154 directions reflection of two sides, pass first plane of refraction 154 at last and leave lens 15, this is the light path of first light path 17.Other second light path 18 is that light is sent by light emitting diode, passes bottom surface 156 and enters in the lens 15, will leave lens 15 behind the light refraction via second parts 152 again.This piece instructions provides and utilizes lens 15 with pointolite refraction and reflection, and light is concentrated by side emitting.Because the technology that provides of this case is with providing the more backlight assembly of thin type so that reflecting plate 16 curvatures are slowed down,, also can't reaches and make the uniform purpose of picture briliancy so still can't solve the problem of brightness disproportionation between point source of light that leading portion mentions and the reflecting plate.
Summary of the invention
In order to overcome above-mentioned shortcoming, the invention provides a kind of backlight assembly and disk lens thereof and light emitting diode, this backlight assembly comprises: a reflector plate, at least one point source of light, be positioned at this reflector plate on, and dish-shaped lens that coat this point source of light.This disk lens comprises a transmission plane, and this transmission plane is an arc on for bottom surface and its section of this disk lens; One reflecting surface, this reflecting surface is last arc for upper surface and its section of these lens; Second ring side, this circumferential lateral edge are positioned at this reflecting surface and this transmission plane side connects formed dip plane; And a scattering surface, this scattering surface is one to be formed at the dome of the middle part of this reflecting surface.
In addition, light emitting diode comprises: a light-emitting semi-conductor components and dish-shaped lens.This light emitting diode is coated in this disk lens, and the light launched of light-emitting semi-conductor components via this disk lens with light scatter and reflection, provide uniform light source to backlight assembly.
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 the known displays backlight assembly;
Fig. 2 is the synoptic diagram for the known displays backlight assembly;
Fig. 3 is the synoptic diagram for known lens directs light source;
Fig. 4 is disk lens synoptic diagram of the present invention;
Fig. 5 is the light path synoptic diagram for backlight assembly of the present invention;
Fig. 6 is light emitting diode synoptic diagram of the present invention.
The reference numeral explanation:
1～backlight assembly 11,11a～diffusion sheet
13～reflector plate, 14～pointolite
Distance 15～the lens of d～pointolite 14 and diffusion sheet 11
151～the first parts, 152～the second parts
153～reflecting surface, 154～the first planes of refraction
155～the second planes of refraction, 156～bottom surface
16～reflecting plate, 17～the first light paths
18～the second light paths L～pointolite lay down location
2～backlight assembly, 21～disk lens
211～transmission plane, 212～reflecting surface
213～circumferential lateral edge, 214～scattering surface
215～front-reflection layer, 216～back reflection layer
217～dented space, 218～plane
30～point source of light, 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
601～light emitting diode
Embodiment
Consult Fig. 4, disk lens 21 comprises transmission plane 211, reflecting surface 212, circumferential lateral edge 213 and scattering surface 214.Transmission plane 211 be for the bottom surface of this disk lens 21 and its section be arc on.Upper surface and its section that reflecting surface 212 is positioned at this disk lens 21 are last arc.This reflecting surface 212 has reflected coat layer, and this reflected coat layer is in order to form a front-reflection layer 215 and a back reflection layer 216.Circumferential lateral edge 213 connects this reflecting surface 212 and this transmission plane 211.And scattering surface 214 is one to be formed at the dome at the optical axis position of this reflecting surface 212.Also be provided with a plane 218 on the transmission plane 211 in the present embodiment in addition.
In conjunction with consulting Fig. 4,5, backlight assembly 2 comprises reflector plate 40, at least one point source of light 30 and lens 21.This point source of light 30 be located at reflector plate 40 on, disk lens 21 is positioned at point source of light 30 tops.The detailed structure of this disk lens 21 discloses in leading portion, and this section repeats no more.In addition, also be provided with a diffusion sheet 50 in backlight assembly 2 tops.
The light that point source of light 30 of the present invention is sent comprises a rear side light path 301, a front side light path 302 and a horizontal optical path 308.This rear side light path 301 is after the light emission by this point source of light 30, penetrate towards these reflector plate 40 directions, again via these reflector plate 40 reflections and towards diffusion sheet 50 directions penetrate form.
Then by after these light source 30 emissions, light directly enters in these lens 21 and forms this front side light path 302.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 be the light that sent by point source of light 30 by this back reflection layer 216 with this light towards this reflector plate 40 directions reflection, at last this reflector plate 40 again with this light towards these diffusion sheet 50 reflections and form.After the light that direct scattering light path 304 is then sent by light source 30 enters these lens 21, light is formed towards these diffusion sheet 50 direction scatterings by this scattering surface 214.In addition, after scattering light path 305 is meant that light enters these lens 21 indirectly, scatter on this front-reflection layer 215, by this front-reflection layer 215 this light is penetrated towards these diffusion sheet 50 directions again by this scattering surface 214.
In addition, because circumferential lateral edge 213 is forms for half transmitting, so after light source 30 was entered by lens 21, directly advancing towards diffusion sheet 50 directions towards the ejaculation of circumferential lateral edge 213 directions was the first side direction light path 306.The light path that can't penetrate second ring side 213 and return in the lens 21 is called the second side direction light path 307.
Above-mentioned lens 21 can with light-emitting semi-conductor components, be packaged together and become the LED assembly as LED, as shown in Figure 6.Its lens arrangement repeats no more with reference to above-mentioned description.
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 (11)
1. backlight assembly comprises at least:
One reflector plate;
At least one be positioned at this reflector plate on point source of light; And
One coats the disk lens of this point source of light, comprising:
One transmission plane, this transmission plane be for the bottom surface of this disk 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;
Lay respectively at the circumferential lateral edge of the joint face of this reflecting surface and this transmission plane; And
One scattering surface, this scattering surface are the domes that is formed at the middle part of this reflecting surface for.
2. backlight assembly as claimed in claim 1 is characterized in that: the reflecting surface of this disk 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 assembly as claimed in claim 1 is characterized in that: this circumferential lateral edge is the form for half transmitting.
4. backlight assembly as claimed in claim 1 is characterized in that: the transmission plane of this disk lens forms a space to coat this point source of light.
5. backlight assembly as claimed in claim 1 is characterized in that: the light that this point source of light sent comprises a rear side light path, and this rear side light path is by behind this point source of light emission light, penetrates towards this reflector plate direction, forms via this reflector plate reflection again.
6. backlight assembly as claimed in claim 1 is characterized in that: the light that this point source of light sent comprises a front side light path, and this front side light path is by behind this point source of light emission light, directly enters in this disk lens and forms.
7. backlight assembly as claimed in claim 1 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 assembly as claimed in claim 7, it is characterized in that: this reflected light path be the light launched by this point source of light see through this disk lens after, the reflection horizon towards this reflector plate direction emission, forms with this light this light again towards this diffusion sheet direction reflection.
9. backlight assembly as claimed in claim 7 is characterized in that: this direct scattering light path is to be entered in this disk lens by the light that this point source of light is launched, and by this scattering surface this light is formed towards this diffusion sheet direction scattering.
10. backlight assembly as claimed in claim 7, it is characterized in that: this indirect scattering light path is to be entered in this disk lens by the light that this point source of light is launched, by this scattering surface with this light scatter to the front-reflection layer, again by this this light of front-reflection layer towards this diffusion sheet direction penetrate form.
11. backlight assembly as claimed in claim 1 is characterized in that: this point source of light is to be light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100516247A CN100359381C (en) | 2005-02-08 | 2005-02-08 | Disk lens and dot light source of back light assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100516247A CN100359381C (en) | 2005-02-08 | 2005-02-08 | Disk lens and dot light source of back light assembly |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200710137194XA Division CN100472269C (en) | 2005-02-08 | 2005-02-08 | Dished lens and point source of light in back lighting module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1645217A true CN1645217A (en) | 2005-07-27 |
| CN100359381C CN100359381C (en) | 2008-01-02 |
Family
ID=34876609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100516247A Expired - Fee Related CN100359381C (en) | 2005-02-08 | 2005-02-08 | Disk lens and dot light source of back light assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100359381C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100399149C (en) * | 2005-09-19 | 2008-07-02 | 中强光电股份有限公司 | Illuminating device and plane light-source module |
| CN110056839A (en) * | 2019-04-02 | 2019-07-26 | 福建华佳彩有限公司 | A kind of secondary lens structure with reflecting effect |
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 CNB2005100516247A patent/CN100359381C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100399149C (en) * | 2005-09-19 | 2008-07-02 | 中强光电股份有限公司 | Illuminating device and plane light-source module |
| CN110056839A (en) * | 2019-04-02 | 2019-07-26 | 福建华佳彩有限公司 | A kind of secondary lens structure with reflecting effect |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100359381C (en) | 2008-01-02 |
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