CN100422814C - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN100422814C CN100422814C CNB2005100638297A CN200510063829A CN100422814C CN 100422814 C CN100422814 C CN 100422814C CN B2005100638297 A CNB2005100638297 A CN B2005100638297A CN 200510063829 A CN200510063829 A CN 200510063829A CN 100422814 C CN100422814 C CN 100422814C
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- reflector space
- diffusivity
- light source
- backlight module
- reflecting plate
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Abstract
The present invention discloses a back light module. The present invention comprises a reflecting plate and a light source, wherein the reflecting plate is provided with a plurality of reflecting zones, the light source is arranged on at least one side of the reflecting plate, and emitted light is reflected by the reflecting plate and is emitted to a light emergent side; the diffusivity of the reflecting zones far away from the light source is different from that of the reflecting zones near the light source.
Description
Technical field
The present invention relates to a kind of backlight module, particularly relate to a kind of backlight module with the different reflecting plate of diffusivity.
Background technology
Liquid crystal indicator mainly is to show with a liquid crystal panel (LCD panel), because liquid crystal panel itself can't be luminous, therefore must supply the light source that brightness is abundant and be evenly distributed, and makes normally show image of liquid crystal panel.The function of this supply light source is promptly undertaken by (backlight) backlight module.Backlight module can be according to the difference of its structure, and is divided into two kinds of side light type back light module and direct type backlight modules.
The design of direct type backlight module, to place as the fluorescent tube of light source under the backlight module, because of accommodation space becomes big, so can use the fluorescent tube more than two to increase the intensity of light source, but relatively also increased the thickness of backlight module and the power consumption of fluorescent tube, thereby be applicable to portability and the more not fastidious general LCD of space requirement; And side light type back light module adopts single tubes or a plurality of tubes to be positioned over the side of light guide plate usually, with as light source, and can utilize light guide plate design to strengthen control to light going direction.
See also Fig. 1, the structure of existing side light type back light module is illustrated.Fig. 1 shows the exploded view of the liquid crystal indicator 100 that uses existing side light type back light module.The side light type back light module that liquid crystal indicator 100 has a liquid crystal panel 180, a housing 190 and is coated on housing 190 inside.Side light type back light module includes a fluorescent tube as light source 110, a reflecting plate 120, a light guide plate 130 and other and is applicable to blooming piece 140 in the backlight module; for example protect diffusion sheet, prismatic lens, light-collecting piece, diffused inside sheet etc.; in addition; can be provided with a source reflection sheet 115 in light source 110 outsides, scatter and disappear to backlight module with the light of avoiding light source 110 to send.Light guide plate 130 and other blooming piece 140 all can increase and decrease according to the demand of backlight module.
As shown in Figure 1, the light source 110 of side light type back light module is with light directive light guide plate 130, scattering direction by light guide plate 130 guiding light, make light directive bright dipping side (being the direction of liquid crystal panel 180), improving the demonstration briliancy of liquid crystal indicator 100, and guarantee the homogeneity of liquid crystal panel 180 brightness.The effect of reflecting plate 120 is to penetrate light guide plate 130 but not in the light reflected back light guide plate 130 of directive bright dipping side, makes its directive bright dipping side, to improve the light utilization ratio.If in the side light type back light module that does not use light guide plate 130, light source 110 emitted light directly reflect the back towards the bright dipping side by reflecting plate 120.
Generally speaking, the briliancy of side light type back light module and homogeneity can be because the microstructure of light guide plate and size different, and produce different variations.Yet, in the existing side light type back light module,, can reduce into optical efficiency if when using light guide plate as the purposes of leaded light; And when size backlight was big, therefore the weight of light guide plate also increased many.Yet reflecting plate 120 is to adopt single material mostly, when the structure of side light type back light module or size change, the reflecting plate 120 of this single material also can't produce corresponding reflection characteristic adjustment in response to the different size of various side light type back light modules, therefore is easy to generate the bad problem of brightness uniformity.
In addition, the employed light source 110 of side light type back light module, except the difference of self character, the position difference of its configuration can make that also briliancy changes.For example, light source 110 may be arranged at the one-sided of reflecting plate 120 shown in Fig. 2 A, also may be shown in Fig. 2 B, and be arranged at the relative both sides of reflecting plate 120, or shown in Fig. 2 C, be located on the periphery of reflecting plate 120.The reflecting plate 120 of single material also can't be in response to the difference of various light sources configurations, and produces corresponding reflection characteristic adjustment, therefore is easy to generate the bad problem of brightness uniformity.
Summary of the invention
In view of this, one embodiment of the invention disclose a kind of backlight module, are used for liquid crystal indicator, and this backlight module comprises a reflecting plate and a light source.Have a plurality of reflector spaces on the reflecting plate, and light source is arranged at least one side of reflecting plate.Wherein, the surface away from the reflector space of this light source is a diffusingsurface, and the surface near the reflector space of this light source is a minute surface, so that be higher than diffusivity near the reflector space of light source away from the diffusivity of the reflector space of light source in the above-mentioned reflector space.
Another embodiment of the present invention discloses a kind of backlight module, be used for liquid crystal indicator, this backlight module comprises a reflecting plate, one second reflector space that has first reflector space that is positioned at dual-side and be positioned at central portion, wherein the surface of this second reflector space is a diffusingsurface, respectively the surface of first reflector space is a minute surface, so that the diffusivity of second reflector space is different from the diffusivity of first reflector space; And two light sources, be arranged at the side of reflecting plate respectively, near first reflector space.
Another embodiment of the present invention discloses a kind of backlight module, be used for liquid crystal indicator, this backlight module comprises a reflecting plate, have one first reflector space of the outer side edges of being located on and be located at one second inner reflector space, wherein this first reflector space is different with the Facing material of this second reflector space, so that the diffusivity of second reflector space is different from the diffusivity of first reflector space; And at least one light source, be located on the outer side edges of reflecting plate, near first reflector space, wherein the surface of this second reflector space is a diffusingsurface, the surface of this first reflector space is a minute surface.
For above-mentioned and other purpose of the present invention, feature and advantage can be become apparent, concrete preferred embodiment cited below particularly, and cooperate appended graphic elaborating.
Description of drawings
Fig. 1 is the side-looking exploded view of an existing side light type back light module;
Fig. 2 A is that light source is disposed at the one-sided synoptic diagram of reflecting plate in the existing side light type back light module;
Fig. 2 B is the synoptic diagram that light source is disposed at the reflecting plate both sides in the existing side light type back light module;
Fig. 2 C is the synoptic diagram that light source is located on the reflecting plate periphery in the existing side light type back light module;
Fig. 3 is the three-dimensional exploded view of the backlight module of one embodiment of the invention;
Fig. 4 A is the synoptic diagram of the backlight module of another embodiment of the present invention;
Fig. 4 B is the synoptic diagram of the backlight module of further embodiment of this invention; And
Fig. 4 C is the synoptic diagram of the backlight module of further embodiment of this invention.
Embodiment
See also Fig. 3, the structure of the backlight module of its explanation one embodiment of the invention.Backlight module shown in Figure 3, for light source 10 is arranged at the pattern of reflecting plate 20 both sides, its structure also has blooming piece 40 and source reflection sheet 15 except that comprising light source 10 and reflecting plate 20, but does not have a light guide plate.10 both sides that are arranged at reflecting plate 20 of light source have a plurality of according to reflector space 20a, 20b, 20c, 20d, 20e, 20f, 20g that light source limited on the reflecting plate 20.Light source 10 emitted lights directly penetrate towards the bright dipping side direction of blooming piece 40 (promptly towards) via reflecting plate 20 reflection.Wherein, away from the reflector space of light source 10, be the most central reflector space 20d among reflector space 20a, 20b, 20c, 20d, 20e, 20f, the 20g, and, be reflector space 20a and 20g near both sides near the reflector space of light source 10.For the brightness of backlight module homogeneity is improved, so the diffusivity of reflector space 20a, 20b, 20c, 20d, 20e, 20f, 20g is different, away from the reflector space 20d of light source 10, its diffusivity the highest (for example the surface is a diffusingsurface); And than reflector space 20a and 20g near light source, its diffusivity minimum (for example the surface is a minute surface), middle each reflector space is then complied with apart from the distance of light source 10 and is adjusted, and distance then diffusivity far away more is high more.
Further, different at employed light source 10 configurations of backlight module, the reflector space on the reflecting plate 20 also has different configurations.Below please respectively referring to Fig. 4 A, Fig. 4 B and Fig. 4 C, at 10 configurations of different light sources, configuration is illustrated to the reflector space on the reflecting plate 20.
Among the embodiment of Fig. 4 A, light source 10 is arranged at the one-sided of reflecting plate 20.At this moment, the reflector space on the reflecting plate 20 can be divided near first reflector space 201 of light source 10 and away from second reflector space 202 of light source 10, and the 3rd reflector space 203 between first reflector space 201 and second reflector space 202.First reflector space 201 has first diffusivity, second reflector space 202 and has second diffusivity, the 3rd reflector space 203 has the 3rd diffusivity.Second reflector space 202 is because away from light source 10, so its second diffusivity is higher than the 3rd diffusivity of the 3rd reflector space 203, and the 3rd diffusivity of the 3rd reflector space 203 is higher than first diffusivity of first reflector space 201.So, can make the brightness of backlight module homogeneity improve.
Among the embodiment of Fig. 4 B, two light sources 10 are arranged at the both sides of reflecting plate 20 respectively.At this moment, reflector space on the reflecting plate 20 can be divided into and be positioned at dual-side and near first reflector space 201 of light source 10, be positioned at central portion and away from second reflector space 202 of light source 10, and the 3rd reflector space 203 between first reflector space 201 and second reflector space 202.First reflector space 201 has first diffusivity, second reflector space 202 and has second diffusivity, the 3rd reflector space 203 has the 3rd diffusivity.Second reflector space 202 is because away from light source 10, so its second diffusivity is higher than the 3rd diffusivity of the 3rd reflector space 203, and the 3rd diffusivity of the 3rd reflector space 203 is higher than first diffusivity of first reflector space 201.So, can make the brightness of backlight module homogeneity improve.
Among the embodiment of Fig. 4 C, a plurality of light sources 10 are located on the periphery (i.e. all outer side edges) of reflecting plate 20 respectively.At this moment, reflector space on the reflecting plate 20 can be divided into and be located on the outermost side and near first reflector space 201 of light source 10, be positioned at inside and away from second reflector space 202 of light source 10, and be located on the 3rd reflector space 203 between first reflector space 201 and second reflector space 202.First reflector space 201 has first diffusivity, second reflector space 202 and has second diffusivity, the 3rd reflector space 203 has the 3rd diffusivity.Second reflector space 202 is because away from light source 10, so its second diffusivity is higher than the 3rd diffusivity of the 3rd reflector space 203, and the 3rd diffusivity of the 3rd reflector space 203 is higher than first diffusivity of first reflector space 201.So, can make the brightness of backlight module homogeneity improve.
In this mandatory declaration, above-mentioned Fig. 4 A～embodiment of Fig. 4 C is divided into three groups with reflector space, however in the practical application, can be according to the structure and the size requirements of backlight module, and reflector space is divided into the combination of any amount, be not restricted to the described embodiments.
In addition, in the various embodiments described above, light source can be cathode fluorescent tube or light emitting diode (LED), also can adopt other suitable luminophor as the backlight module light source.
Though in conjunction with having disclosed the present invention with preferred embodiment; yet it is not in order to limiting the present invention, anyly is familiar with this operator, without departing from the spirit and scope of the present invention; still can do some change and retouching, so protection scope of the present invention should be with being as the criterion that claim was defined.
Claims (10)
1. a backlight module is used for liquid crystal indicator, and this backlight module comprises:
One reflecting plate has a plurality of reflector spaces; And
At least one light source is arranged at least one side of this reflecting plate;
Wherein, the surface away from the reflector space of this light source is a diffusingsurface, the surface near the reflector space of this light source is a minute surface, so that be higher than diffusivity near the reflector space of this light source away from the diffusivity of the reflector space of this light source in this each reflector space.
2. backlight module as claimed in claim 1, wherein this light source is cathode fluorescent tube or light emitting diode.
3. backlight module as claimed in claim 1, wherein this reflecting plate comprises:
One first reflector space adjacent to this light source, has one first diffusivity;
One second reflector space is away from this light source, has one second diffusivity; And
One the 3rd reflector space between this first reflector space and this second reflector space, has one the 3rd diffusivity,
Wherein this second diffusivity is greater than the 3rd diffusivity, and the 3rd diffusivity is greater than this first diffusivity.
4. a backlight module is used for liquid crystal indicator, and this backlight module comprises:
One reflecting plate, one second reflector space that has first reflector space that is positioned at dual-side and be positioned at central portion, wherein the surface of this second reflector space is a diffusingsurface, respectively the surface of first reflector space is a minute surface, so that the diffusivity of this second reflector space is different from the diffusivity of this each first reflector space; And
Two light sources are arranged at this each side of this reflecting plate respectively, near should each first reflector space.
5. backlight module as claimed in claim 4, wherein this each light source is cathode fluorescent tube or light emitting diode.
6. backlight module as claimed in claim 4, wherein this reflecting plate also comprises one the 3rd reflector space, be arranged between this first reflector space and this second reflector space, the diffusivity of the 3rd reflector space is higher than the diffusivity of this each first reflector space, and is lower than the diffusivity of this second reflector space.
7. a backlight module is used for liquid crystal indicator, and this backlight module comprises:
One reflecting plate, have one first reflector space of the outer side edges of being located on and be located at one second inner reflector space, wherein this first reflector space is different with the Facing material of this second reflector space, so that the diffusivity of this second reflector space is different from the diffusivity of this first reflector space; And
At least one light source is located on this each outer side edges of this reflecting plate, near this first reflector space,
Wherein the surface of this second reflector space is a diffusingsurface, and the surface of this first reflector space is a minute surface.
8. backlight module as claimed in claim 7, wherein the diffusivity of this second reflector space is higher than the diffusivity of this each first reflector space.
9. backlight module as claimed in claim 7, wherein this reflecting plate also has the 3rd reflector space, be located between this first reflector space and this second reflector space, the diffusivity of the 3rd reflector space is higher than the diffusivity of this first reflector space, and is lower than the diffusivity of this second reflector space.
10. backlight module as claimed in claim 7, wherein this light source is cathode fluorescent tube or light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100638297A CN100422814C (en) | 2005-04-08 | 2005-04-08 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100638297A CN100422814C (en) | 2005-04-08 | 2005-04-08 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1658048A CN1658048A (en) | 2005-08-24 |
| CN100422814C true CN100422814C (en) | 2008-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100638297A Expired - Fee Related CN100422814C (en) | 2005-04-08 | 2005-04-08 | Backlight module |
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| Country | Link |
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| CN (1) | CN100422814C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389349C (en) * | 2005-11-07 | 2008-05-21 | 友达光电股份有限公司 | Backlight module |
| JP5406225B2 (en) | 2010-12-06 | 2014-02-05 | エルジー イノテック カンパニー リミテッド | Backlight unit |
| CN102620208B (en) * | 2012-03-29 | 2015-12-09 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN104090314B (en) * | 2014-05-19 | 2019-02-19 | 北醒（北京）光子科技有限公司 | Optics active diffusion sheet |
| KR102071472B1 (en) * | 2018-06-28 | 2020-01-30 | 주식회사 엘엠에스 | Optical film for mini led or micro led backlight unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11144512A (en) * | 1997-11-07 | 1999-05-28 | Sony Corp | Illuminating device |
| CN2408471Y (en) * | 2000-02-17 | 2000-11-29 | 东莞宇宙电子有限公司 | Two-way light conductive plate |
| US6224246B1 (en) * | 1998-03-18 | 2001-05-01 | Koito Manufacturing Co., Ltd. | Signal lamp for vehicles |
| CN1512230A (en) * | 2002-12-27 | 2004-07-14 | 鸿富锦精密工业（深圳）有限公司 | Back light module |
-
2005
- 2005-04-08 CN CNB2005100638297A patent/CN100422814C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11144512A (en) * | 1997-11-07 | 1999-05-28 | Sony Corp | Illuminating device |
| US6224246B1 (en) * | 1998-03-18 | 2001-05-01 | Koito Manufacturing Co., Ltd. | Signal lamp for vehicles |
| CN2408471Y (en) * | 2000-02-17 | 2000-11-29 | 东莞宇宙电子有限公司 | Two-way light conductive plate |
| CN1512230A (en) * | 2002-12-27 | 2004-07-14 | 鸿富锦精密工业（深圳）有限公司 | Back light module |
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| Publication number | Publication date |
|---|---|
| CN1658048A (en) | 2005-08-24 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081001 Termination date: 20210408 |