CN100595650C - Back light device - Google Patents
Back light device Download PDFInfo
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- CN100595650C CN100595650C CN200710175488A CN200710175488A CN100595650C CN 100595650 C CN100595650 C CN 100595650C CN 200710175488 A CN200710175488 A CN 200710175488A CN 200710175488 A CN200710175488 A CN 200710175488A CN 100595650 C CN100595650 C CN 100595650C
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- louvre
- reflecting plate
- lighting device
- light
- back lighting
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Abstract
The invention comprises: a bottom reflecting plate, a light-emitting unit located on the bottom reflecting plate, a side reflecting plate located around the bottom reflecting plate and an optical assembly located at one side of the side reflecting plate; there are cooling holes located at the portion of the side reflecting plate near to the bottom reflecting plate; based on the projection angle ofthe light-emitting unit, setting the width of the cooling holes in order to make the light not capable of reaching the cooling holes; mounting a folding edge on the cooling holes to reflect the lightto the inside of the backlight device. The can increase the brightness of the backlight device while keeping good cooling effect.
Description
Technical field
The present invention relates to a kind of back lighting device, relate in particular to the downward back electro-optical device in a kind of LCD with heat abstractor.
Background technology
Liquid crystal panel in the LCD is not luminous, but relies on the back lighting device behind the liquid crystal panel next luminous as light source, thereby finishes Presentation Function.Using maximum backlights at present mainly is light emitting diode (Light Emitting Diode is called for short LED).The color reducibility of LED is good, brightness uniformity is good, the life-span is long, anti-seismic performance is good, has widely applied in the back lighting device of liquid crystal panel.
As shown in Figure 1, be the structural representation of the direct-light type LED backlight device of prior art, this back lighting device comprises several LED lamp groups 11, reflecting plate 12, diffuser plate 13, prism film 14 and diaphragm 15; Reflecting plate 121 and four lateral reflection plates 122 at the bottom of wherein reflecting plate 12 comprises one, lateral reflection plate 122 lays respectively at four limits of base plate 121, and vertically extend from end reflecting plate 121, form the box of a side opening, prism film 14 is close to the exiting surface of diffuser plate 13, and in order to improve backlight illumination, diaphragm 15 is positioned on prism film 14 exiting surfaces, play the effect of protection diaphragm, diffuser plate 13 vertically covers on the reflecting plate 12; Be furnished with plurality of opening 1211 on the end reflecting plate 121, LED lamp group 11 is arranged on perforate 1211 places, and reflecting plate 12 light that LED lamp group 11 is sent reflexes to diffuser plate 13 thus; The light that diffuser plate 13 sends LED lamp group converts area source to by pointolite.
Along with development of times, current electronics shows that product is more and more higher to the requirement of brightness, so the luminosity of back lighting device requires more and more higher.For the direct-light type LED backlight device, for improving the back lighting device overall brightness, existing method is to realize by increasing unit area LED number.Whole LED back lighting device total power consumption sharply increases thereupon thus, causes the working temperature of back lighting device inside to raise.And the led chip temperature is when surpassing a certain critical temperature, and its luminescence efficiency can significantly reduce, and this has just caused vicious cycle, and certainly will shorten the LED life-span; The back lighting device internal temperature is too high, and regular meeting causes diffuser plate/sheet, prism film, end expelling plate thermal stress deformation or yellow, and colour mixture is poor; The back lighting device internal temperature is too high, also can cause liquid crystal panel overheated, shortens liquid crystal panel display life.
Summary of the invention
The purpose of this invention is to provide a kind of back lighting device, thereby overcome the defective of prior art, when increasing back lighting device brightness, reach good heat radiation to be implemented in.
For achieving the above object, the invention provides a kind of back lighting device, comprising:
End reflecting plate is used for reflection ray;
Light-emitting device is positioned on the reflecting plate of the described end, is used to produce light;
Lateral reflection plate is arranged at around the reflecting plate of the described end, is used for reflection ray; Has first louvre that is used to dispel the heat on the described lateral reflection plate;
The optics module is positioned at described lateral reflection plate one side, is used for pointolite is converted to area source and improves backlight illumination.
Described light-emitting device is a light emitting diode, and described first louvre is positioned at described lateral reflection plate near reflecting plate place, the described end, the breadth extreme of described first louvre
Wherein, d is the breadth extreme of described first louvre, and s is positioned at the vertical range of the center of the described light emitting diode of close described lateral reflection plate on the reflecting plate of the described end to described lateral reflection plate, and α is the emission angle of described light emitting diode.Described first louvre be shaped as rectangle, circle or oval.Also have second louvre that is used to dispel the heat on the described lateral reflection limit, have flanging on described second louvre, be used for the described back lighting device of the light reflected back inside that to be radiated on the described louvre.Described flanging is towards the inboard or the outside of described back lighting device.
By above technical scheme as can be known, shape and the position of the present invention by louvre being set on the reflecting plate in back lighting device and louvre being set, and the dimension width of louvre is set according to the emission angle of light-emitting device, realized when increasing back lighting device brightness, the light that light-emitting device is sent can't shine the louvre place, perhaps shines light on the louvre and is set at flanging reflected back on the louvre.Therefore, louvre is set in back lighting device, can effectively carries out the inside and outside heat interchange of back lighting device, reach better heat radiating effect.
Also in conjunction with the accompanying drawings the present invention is described in further detail below by specific embodiment.
Description of drawings
Fig. 1 is the structural representation of the direct-light type LED backlight device of prior art;
Fig. 2 is the structural representation of back lighting device embodiment 1 of the present invention;
Fig. 3 is the structural representation of back lighting device embodiment 2 of the present invention;
Fig. 4 is the cross-sectional view of back lighting device embodiment 2 of the present invention;
Fig. 5 is the structural representation of back lighting device embodiment 3 of the present invention;
Fig. 6 is one of cross-sectional view of back lighting device embodiment 3 of the present invention;
Fig. 7 is two of the cross-sectional view of back lighting device embodiment 3 of the present invention;
Fig. 8 is the structural representation of back lighting device embodiment 4 of the present invention;
Fig. 9 is the cross-sectional view of back lighting device embodiment 4 of the present invention.
Embodiment
As shown in Figure 2, be the structural representation of the embodiment of the invention 1, the back lighting device of present embodiment comprises that a plurality of light-emitting devices are light emitting diode 41, reflecting plate 42, optics module 43; Reflecting plate 42 is used for reflection ray, form by end reflecting plate 421 and lateral reflection plate 422, lateral reflection plate 422 lay respectively at end reflecting plate 421 around, and vertically extend from end reflecting plate 421, form the box of a side opening, offer at least one louvre 4221 on the lateral reflection plate 422 respectively, grind out louvre 4221 and can be rectangle, circle or oval; Be furnished with plurality of opening 4211 on the end reflecting plate 421, perforate 4211 is arranged according to the difference of light emitting diode 41 and is set to circular hole or square hole, and light emitting diode 41 is arranged on perforate 4211 places; Optics module 43 vertically covers on the reflecting plate 42 and is positioned at lateral reflection plate 422 1 sides, and the light that reflecting plate 42 sends light emitting diode 41 reflexes to optics module 43.
When light emitting diode 41 is luminous, its total power consumption increases, cause the working temperature of back lighting device inside to raise, present embodiment is by offering at least one louvre 4221 respectively on lateral reflection plate 422, make the inner and outside convection current that produces air of back lighting device, thereby take away heat, realize the heat radiation of back lighting device.
As shown in Figure 3, be the structural representation of the embodiment of the invention 2, the back lighting device of present embodiment comprises that a plurality of light-emitting devices are light emitting diode 41, reflecting plate 42, optics module 43; Reflecting plate 42 is used for reflection ray, form by end reflecting plate 421 and lateral reflection plate 422, lateral reflection plate 422 lay respectively at end reflecting plate 421 around, and vertically extend from end reflecting plate 421, form the box of a side opening, offer at least one louvre 4221 on the lateral reflection plate 422 respectively, and louvre 4221 is positioned at lateral reflection plate 422 near reflecting plate 421 places, the end, the breadth extreme of louvre 4221 is less than or equal to and is positioned on the end reflecting plate 421 near the center of the light emitting diode 41 of lateral reflection plate 422 ratio to the tangent value of the vertical range of lateral reflection plate 422 and 1/2nd emission angle α of light emitting diode 41 (being α/2), that is:
In the formula (1), d represents the breadth extreme of louvre 4221, and s represents to be positioned at the vertical range of the center of the light emitting diode 41 of close lateral reflection plate 422 on the end reflecting plate 421 to lateral reflection plate 422, and α represents the emission angle of light emitting diode 41,
The tangent value of/2nd emission angle α (being α/2) of expression light emitting diode 41.
The louvre of opening 4221 can be rectangle, circle or oval, and the width of circular and oval-shaped louvre 4221 its circumscribed rectangles all must be less than or equal to breadth extreme d; Be furnished with plurality of opening 4211 on the end reflecting plate 421, perforate 4211 is arranged according to the difference of light emitting diode 41 and is set to circular hole or square hole, and light emitting diode 41 is arranged on perforate 4211 places; Optics module 43 vertically covers on the reflecting plate 42 and is positioned at lateral reflection plate 422 1 sides, and the light that reflecting plate 42 sends light emitting diode 41 reflexes to optics module 43.
As shown in Figure 4, be the cross-sectional view of the embodiment of the invention 2, light emitting diode 41 be set, near reflecting plate 421 places, the end louvre 4221 is set at lateral reflection plate 422 at perforate 4211 places of end reflecting plate 421.
When light emitting diode 41 is luminous, the light that all light emitting diodes 41 send all can't shine louvre 4221 places, and then can not go out louvre 4221 by direct irradiation, thereby can not weaken light intensity, end reflecting plate 421 reflexes to optics module 43 with the light that lateral reflection plate 422 sends light emitting diode 41.
The described louvre 4221 of present embodiment is opened in reflecting plate 421 places, the close end on the lateral reflection plate 422, and according to formula (1) louvre 4221 is set, and the light that light emitting diode 41 is sent can't shine louvre 4221 places, can effectively avoid light leak; Simultaneously, louvre 4221 promotes the inner and outside convection current that produces air of back lighting device, has realized the heat radiation of back lighting device.
As shown in Figure 5, be the structural representation of the embodiment of the invention 3, comprise in the back lighting device of present embodiment that a plurality of light-emitting devices are light emitting diode 41, reflecting plate 42, optics module 43; Reflecting plate 42 is used for reflection ray, form by end reflecting plate 421 and lateral reflection plate 422, lateral reflection plate 422 lay respectively at end reflecting plate 421 around, and vertically extend from end reflecting plate 421, form the box of a side opening; Be respectively provided to few 1 louvre 5221 on the lateral reflection plate 422, have flanging on this louvre 5221, be used for the light reflection of will shine on louvre 5221; Be furnished with plurality of opening 4211 on the end reflecting plate 421, perforate 4211 is arranged according to the difference of light emitting diode 41 and is set to circular hole or square hole, and light emitting diode 41 is arranged on perforate 4211 places; Optics module 43 vertically covers on the reflecting plate 42 and is positioned at lateral reflection plate 422 1 sides, and the light that reflecting plate 42 sends light emitting diode 41 reflexes to optics module 43.
Particularly, as shown in Figure 6, be one of back lighting device embodiment 3 cross-sectional view of the present invention, wherein the flanging on the louvre 5221 is towards the back lighting device inboard, perforate 4211 places at end reflecting plate 421 are provided with light emitting diode 41, when light emitting diode 41 was luminous, the light that is radiated at louvre 5221 was reflected by flanging, and end reflecting plate 421 reflexes to optics module 43 with the light that lateral reflection plate 422 sends light emitting diode 41; As shown in Figure 7, be two of back lighting device embodiment 3 cross-sectional view of the present invention, wherein be arranged on flanging on the louvre 5221 on the lateral reflection plate 422 towards the back lighting device outside, perforate 4211 places at end reflecting plate 421 are provided with light emitting diode 41, when light emitting diode 41 was luminous, the light that is radiated at louvre 5221 was reflexed to optics module 43 by flanging.
By present embodiment as can be seen, louvre 5221 is provided with flanging, and when light emitting diode 41 was luminous, flanging can be with irradiation light reflected back back lighting device inside thereon.Therefore, set up louvre 5221, not only can promote the heat radiation of back lighting device with flanging, simultaneously can be with light reflected back optics module 43, thus can effectively avoid light leak.
As shown in Figure 8, structural representation for the embodiment of the invention 4, in the back lighting device of present embodiment, reflecting plate 42 is made up of lateral reflection plate 422 and end reflecting plate 421, form the box of a side opening, on lateral reflection plate 422, offer at least 1 first louvre 4321 respectively near the part of end reflecting plate 421, and the breadth extreme of first louvre 4321
In the formula, d represents the breadth extreme of first louvre 4321, and s represents to be positioned at the vertical range of the center of the light emitting diode 41 of close lateral reflection plate 422 on the end reflecting plate 421 to lateral reflection plate 422, and α represents the emission angle of light emitting diode 41,
The tangent value of/2nd emission angle α (being α/2) of expression light emitting diode 41, the light that the light emitting diode 41 that is arranged on end reflecting plate 421 perforates 4211 places is sent can't shine first louvre, 4321 places, and then can not directly penetrate this back lighting device, thereby can light leak, effectively increased light intensity; At least 1 second louvre 5321 is set on lateral reflection plate 422 simultaneously, has flanging on this second louvre 5321, be used for the light reflected back back lighting device inside that to shine on second louvre 5321.
As shown in Figure 9, be back lighting device embodiment 4 cross-sectional view of the present invention, perforate 4211 places at end reflecting plate 421 are provided with light emitting diode 41, when light emitting diode 41 is luminous, light can't shine first louvre, 4321 places that are arranged on the lateral reflection plate 422, and the light that is radiated at second louvre 5321 on the lateral reflection plate 422 is simultaneously reflexed to optics module 43 by flanging.
Wherein, the shape of first louvre 4321 and second louvre 5321 can be rectangle, circle or oval, and the width of circular and oval-shaped first louvre 4321 and second louvre, 5321 its circumscribed rectangles all must be less than or equal to breadth extreme d; Flanging on second louvre 5321 can be towards the back lighting device inboard or the outside.
The described back lighting device of present embodiment is offered first louvre 4321 and second louvre 5321, effectively carries out the inside and outside heat interchange of back lighting device, reaches certain radiating effect; Because the setting of first louvre 4321, so that the light that light emitting diode 41 sends can't shine first louvre 4321, therefore can effectively avoid light leak; And because on second louvre 5321, be provided with flanging, therefore shine light on second louvre 5321 by the flanging reflected back, so under the situation of the brightness that increases back lighting device, also can effectively avoid light leak.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (4)
1, a kind of back lighting device is characterized in that, comprising:
End reflecting plate is used for reflection ray;
Light-emitting device is positioned on the reflecting plate of the described end, is used to produce light;
Lateral reflection plate is arranged at around the reflecting plate of the described end, is used for reflection ray; Has first louvre that is used to dispel the heat on the described lateral reflection plate;
The optics module is positioned at described lateral reflection plate one side, is used for pointolite is converted to area source and improves backlight illumination;
Described light-emitting device is a light emitting diode, and described first louvre is positioned at described lateral reflection plate near reflecting plate place, the described end, the breadth extreme of described first louvre
Wherein, d is the breadth extreme of described first louvre, and s is positioned at the vertical range of the center of the described light emitting diode of close described lateral reflection plate on the reflecting plate of the described end to described lateral reflection plate, and α is the emission angle of described light emitting diode.
2, back lighting device according to claim 1 is characterized in that, described louvre be shaped as rectangle, circle or oval.
3, back lighting device according to claim 1, it is characterized in that, also have second louvre that is used to dispel the heat on the described lateral reflection plate, have flanging on described second louvre, be used for the described back lighting device of the light reflected back inside that to be radiated on described second louvre; Described flanging is towards the inboard or the outside of described back lighting device.
4, back lighting device according to claim 3 is characterized in that, described first louvre and second louvre be shaped as rectangle, circle or oval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710175488A CN100595650C (en) | 2007-09-29 | 2007-09-29 | Back light device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710175488A CN100595650C (en) | 2007-09-29 | 2007-09-29 | Back light device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100069951A Division CN101498409B (en) | 2007-09-29 | 2007-09-29 | Backlight device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101135811A CN101135811A (en) | 2008-03-05 |
| CN100595650C true CN100595650C (en) | 2010-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710175488A Active CN100595650C (en) | 2007-09-29 | 2007-09-29 | Back light device |
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| CN (1) | CN100595650C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628565B (en) * | 2012-03-26 | 2014-01-15 | 深圳市华星光电技术有限公司 | Direct type backlight module and liquid crystal display device |
| TWI526745B (en) | 2013-10-03 | 2016-03-21 | 友達光電股份有限公司 | Light source module |
| CN111564431B (en) * | 2020-05-28 | 2021-08-06 | 马鞍山东毅新材料科技有限公司 | Side-light type light-emitting diode conducting module and preparation method thereof |
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2007
- 2007-09-29 CN CN200710175488A patent/CN100595650C/en active Active
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| Publication number | Publication date |
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| CN101135811A (en) | 2008-03-05 |
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