CN2653542Y - Light-emittig diode backlight source - Google Patents
Light-emittig diode backlight source Download PDFInfo
- Publication number
- CN2653542Y CN2653542Y CNU032239017U CN03223901U CN2653542Y CN 2653542 Y CN2653542 Y CN 2653542Y CN U032239017 U CNU032239017 U CN U032239017U CN 03223901 U CN03223901 U CN 03223901U CN 2653542 Y CN2653542 Y CN 2653542Y
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- Prior art keywords
- light
- guide plate
- light guide
- led
- light source
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The utility model relates to a LED backlight in simple structure and even light distribution, which comprises a LED, a light guide plate and a reflection piece, wherein the reflecting piece is arranged at one side of the light guide plate; a cavity is formed by the reflection piece and the side of the light guide plate together; the LED is arranged at the top end of the cavity and is poisoned between the side of the light guide plate and the reflection piece.
Description
[technical field]
The utility model relates to a kind of flat-panel screens backlight, refers in particular to a kind of back light source in LED.
[background technology]
Because the liquid crystal itself in the panel of LCD does not have the characteristics of luminescence, thereby, for reaching display effect, a planar light source device is provided must for the LCD panel, as backlight or front light-source, its function is to provide the area source that briliancy is abundant and be evenly distributed to panel of LCD.
The backlight that prior art disclosed mainly is made up of light source, light guide plate, reflecting plate, diffuser plate and prism plate etc.Wherein, this light source can be arranged on a side of light guide plate or limit, two opposite sides and with light emission to this light guide plate.The effect of this light guide plate is the transmission direction of direct light line, makes light by the even outgoing of the light-emitting face of light guide plate.Because the light that light source sends enters from the light guide plate side, so light guide plate is luminous brighter near the part of light source, and luminous darker away from the part of light source, therefore, for increasing the light extraction efficiency and the uniformity coefficient of light guide plate, the one side in light guide plate is provided with V-shaped groove or configuration light diffusion site usually.When light transmission during to V-shaped groove or light diffusion site, reflection and scattering will take place in light, and to each different directions transmission, finally by the light-emitting face ejaculation of light guide plate.Utilize various densitys, the V-shaped groove that varies in size or light diffusion site, can make light guide plate luminous evenly.
A kind of prior art back light source in LED as shown in Figure 1, it discloses in No. the 5th, 876,107, the United States Patent (USP) of bulletin on March 2nd, 1999.This back light source in LED 1 comprises a light guide plate 11, an optically-coupled district 12 and a light emitting diode 13.Wherein, this optically-coupled district 12 is connected with this light guide plate 11, the interface of its junction is an optical input surface 111, this light emitting diode 13 is embedded in this 12 inside, optically-coupled district, after the light of its emission is injected this optically-coupled district 12, further is dissipated into this optical input surface 111, and import this light guide plate 11, the one side of this light guide plate 11 is provided with V-shaped groove or configuration light diffusion site, and light is transmitted to each different directions in light guide plate 11, and final light-emitting face ejaculation by light guide plate 11.
The back light source in LED that this patent disclosed, its light source is made of single light emitting diode, thereby it is with low cost, and it is simple in structure, but the exiting surface of this light emitting diode is arranged on this light guide plate central authorities, for the light diffusion area is increased, must make light emitting diode away from the light guide plate setting, this design can obviously increase the light source volume, for the strict small size panel of volume requirement, more inapplicable, and light emitting diode is positioned at optically-coupled district central authorities, cause the light intensity skewness of light guide plate central authorities and both sides easily, thereby influence the panel display effect.
[utility model content]
For overcoming the big and uneven problem of distribution of light of light guide plate volume in the prior art, the utility model provides a kind of volume the little and uniform back light source in LED of distribution of light.
The technical scheme of the utility model technical solution problem is: a kind of back light source in LED is provided, it comprises a light emitting diode, a light guide plate and reflector plate, wherein, this reflector plate is arranged on the side of this light guide plate, the side of this reflector plate and light guide plate folds and forms a cavity, and this light emitting diode is arranged on this cavity top and between the side and reflector plate of this light guide plate.
It is trapezoidal that further improvement of the utility model is that this light guide plate can be designed to, and this reflector plate and light emitting diode all are arranged on the hypotenuse of this trapezoidal light guide plate, and this reflector plate can be an arc, and V-shaped groove or the different site of density can be set thereon.
Compare with prior art, the advantage of the utility model back light source in LED is that it adopts single light emitting diode to cooperate reflector plate to constitute light source, it is simple in structure, and this light emitting diode and reflector plate all are arranged on this light guide plate side, its volume is less, is suitable for the backlight of making the small size panel.
And by reflector plate is designed to arcuate structure, and the different site of V-shaped groove or density is set thereon and rationally adjusts the angle of inclination of light guide plate trapezoidal hypotenuse, it is more even that light is distributed in cavity, and be approximated to a line source, and then the interior light of light guide plate is evenly distributed.
[description of drawings]
Fig. 1 is the stereographic map of prior art back light source in LED.
Fig. 2 is the stereographic map of first kind of embodiment of the utility model back light source in LED.
Fig. 3 is the sectional view of Fig. 2 along the III-III direction.
Fig. 4 is the sectional view of second kind of embodiment of the utility model back light source in LED.
Fig. 5 is the sectional view of the third embodiment of the utility model back light source in LED.
Fig. 6 is the sectional view of the 4th kind of embodiment of the utility model back light source in LED.
Fig. 7 is the sectional view of the 5th kind of embodiment of the utility model back light source in LED.
[embodiment]
Seeing also Fig. 2 and Fig. 3, is first kind of embodiment of the utility model back light source in LED, and wherein Fig. 2 is the stereographic map of first kind of embodiment back light source in LED of the utility model, and Fig. 3 is the sectional view of the III-III direction of Fig. 2.This back light source in LED 2 comprises a light guide plate 21, a reflector plate 22 and a light emitting diode 23.Wherein, this reflector plate 22 is groove structures, and the optical input surface 211 of itself and light guide plate 21 links to each other, and both fold and form a cavity 24, and this cavity 24 is used for holding this light emitting diode 23, and the light launched of transmission light emitting diode 23.This light emitting diode 23 is arranged on this cavity 24 tops, its light of launching is after reflector plate 22 and optical input surface 211 reflections, round-trip transmission in cavity 24, the defeated plane of incidence 211 of this light receives the light from light emitting diode 23 and reflector plate 22 reflections, and it is imported in this light guide plate 21, the one side of this light guide plate 21 is provided with V-shaped groove or configuration light diffusion site, and light is transmitted to each different directions in light guide plate 21, and final light-emitting face ejaculation by light guide plate 21.
For improving light utilization ratio and distribution of light uniformity coefficient, this light guide plate 21 does not adopt common rectangular light guide plate, but be designed to trapezoidal light guide plate, this light guide plate 21 and reflector plate 22 corresponding sides are that optical input surface 211 is exactly trapezoidal hypotenuse, this structure makes the side of light guide plate 21 and reflector plate 22 and not parallel, but there is an angle, it can enlarge the reflection angle that light transmits in cavity, it is more even to make that light distributes in cavity 24, and then improves the light uniformity coefficient that enters light guide plate 21.
For reducing the backlight volume, this reflector plate 22 is arranged on the side of this light guide plate 21, the side of this reflector plate 22 and light guide plate 21 folds and forms a cavity 24, this light emitting diode 23 is arranged on these cavity 24 tops and between the side and reflector plate 22 of this light guide plate 21, it matches with reflector plate 22 and optical input surface 211, make light in its common cavity 24 internal reflections transmission that constitutes, side angle of inclination by appropriate design reflector plate 22 structures and light guide plate 21, light is evenly distributed in cavity, and form the marginal ray source of a proximal line light source, it is little to reach volume, the effect of light good evenness, and adopt single light emitting diode as light source, its cost is also lower.
This light guide plate 21 is to make with transparent material such as acryl resin, polycarbonate, polyvinyl resin or glass etc.This reflector plate 22 can adopt high light reflectivity rate material, also reflectance coating directly can be plated thereon, and the diverse location of reflector plate 22 also can be laid the different site of density, to strengthen light reflection and scattering degree, makes distribution of light more even.
Second and third of the utility model back light source in LED, four, five embodiments all are architecture advances of doing about reflector plate, because its structure difference, the light guide effect of being reached is difference to some extent also.
Second kind of embodiment of the utility model back light source in LED as shown in Figure 4, this back light source in LED 3 comprises a light guide plate 31, a reflector plate 32 and a light emitting diode 33.Wherein, the end of this reflector plate 32 becomes an arc, compares with the plate shaped of first embodiment, and its reflection ray effect is better.
The third embodiment of the utility model back light source in LED as shown in Figure 5, this back light source in LED 4 comprises a light guide plate 41, a reflector plate 42 and a light emitting diode 43.Wherein, the integral body of this reflector plate 42 is arcs.
The 4th kind of embodiment of the utility model back light source in LED as shown in Figure 6, this back light source in LED 5 comprises a light guide plate 51, a reflector plate 52 and a light emitting diode 53.Wherein, the reflective surface of this reflector plate 52 is provided with V-shaped groove, is beneficial to reflectively, makes distribution of light even.
The 5th kind of embodiment of the utility model back light source in LED as shown in Figure 7, this back light source in LED 6 comprises a light guide plate 61, a reflector plate 62 and a light emitting diode 63.Wherein, this reflector plate 62 is arc grooves, and this light emitting diode 63 is located at the focus of this arc groove, after light is sent by light emitting diode 63, through these reflector plate 62 reflections,, can improve the distribution consistency degree of light in light guide plate 61 with approximate parallel angle incident light guide plate 61.
Claims (10)
1. back light source in LED, it comprises: a light emitting diode and a light guide plate, it is characterized in that: this back light source in LED also comprises a reflector plate, this reflector plate is arranged on the side of this light guide plate, the side of this reflector plate and light guide plate folds and forms a cavity, and this light emitting diode is arranged on this cavity top and between the side and reflector plate of this light guide plate.
2. back light source in LED as claimed in claim 1 is characterized in that this light guide plate is trapezoidal light guide plate.
3. back light source in LED as claimed in claim 2 is characterized in that this reflector plate is arranged on the hypotenuse of this trapezoidal light guide plate.
4. back light source in LED as claimed in claim 1 is characterized in that this reflector plate is a groove shape.
5. back light source in LED as claimed in claim 4, this reflector plate is an arc groove.
6. back light source in LED as claimed in claim 1, the end that it is characterized in that this reflector plate is an arc.
7. back light source in LED as claimed in claim 1 is characterized in that this reflector plate is an arc.
8. back light source in LED as claimed in claim 1 is characterized in that this reflector plate is laid with the different site of density, is beneficial to light and evenly distributes.
9. back light source in LED as claimed in claim 1 is characterized in that this reflector plate is provided with V-shaped groove, is beneficial to reflective.
10. back light source in LED as claimed in claim 1 is characterized in that the one side at least of this light guide plate is laid with the different site of density, so that light is evenly distributed in light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032239017U CN2653542Y (en) | 2003-02-24 | 2003-02-24 | Light-emittig diode backlight source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032239017U CN2653542Y (en) | 2003-02-24 | 2003-02-24 | Light-emittig diode backlight source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2653542Y true CN2653542Y (en) | 2004-11-03 |
Family
ID=34325966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032239017U Expired - Lifetime CN2653542Y (en) | 2003-02-24 | 2003-02-24 | Light-emittig diode backlight source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2653542Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454104C (en) * | 2005-06-06 | 2009-01-21 | 友达光电股份有限公司 | Side-lighting type back light module |
| CN102518993A (en) * | 2011-12-16 | 2012-06-27 | 合肥美菱股份有限公司 | Refrigerator and total-reflection honeycomb backlight LED illuminating lamp thereof |
| US8562164B2 (en) | 2010-10-04 | 2013-10-22 | Au Optronics Corporation | Edge-type backlight module |
| CN104344300A (en) * | 2013-07-24 | 2015-02-11 | 标致雪铁龙(中国)汽车贸易有限公司 | Vehicle-mounted backlight lamp |
| WO2019237564A1 (en) * | 2018-06-15 | 2019-12-19 | 惠州市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| US10663799B2 (en) | 2018-06-15 | 2020-05-26 | Huizhou China Star Optoelectronics Technology Co., Ltd. | Backlight module and LCD |
-
2003
- 2003-02-24 CN CNU032239017U patent/CN2653542Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454104C (en) * | 2005-06-06 | 2009-01-21 | 友达光电股份有限公司 | Side-lighting type back light module |
| US8562164B2 (en) | 2010-10-04 | 2013-10-22 | Au Optronics Corporation | Edge-type backlight module |
| CN102518993A (en) * | 2011-12-16 | 2012-06-27 | 合肥美菱股份有限公司 | Refrigerator and total-reflection honeycomb backlight LED illuminating lamp thereof |
| CN104344300A (en) * | 2013-07-24 | 2015-02-11 | 标致雪铁龙(中国)汽车贸易有限公司 | Vehicle-mounted backlight lamp |
| WO2019237564A1 (en) * | 2018-06-15 | 2019-12-19 | 惠州市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| US10663799B2 (en) | 2018-06-15 | 2020-05-26 | Huizhou China Star Optoelectronics Technology Co., Ltd. | Backlight module and LCD |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130224 Granted publication date: 20041103 |