CN201083928Y - Backlight and its reflecting sheet - Google Patents
Backlight and its reflecting sheet Download PDFInfo
- Publication number
- CN201083928Y CN201083928Y CNU2007201226208U CN200720122620U CN201083928Y CN 201083928 Y CN201083928 Y CN 201083928Y CN U2007201226208 U CNU2007201226208 U CN U2007201226208U CN 200720122620 U CN200720122620 U CN 200720122620U CN 201083928 Y CN201083928 Y CN 201083928Y
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- projection
- light
- reflecting piece
- reflective surface
- backlight
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Abstract
The utility model discloses a backlighting source, comprising a light source, a light guide plate and an optical reflector; the light source is positioned at lateral side of the light guide plate, the light guide plate comprises an attachment surface of the optical reflector which is used for contacting the optical reflector and a light-out surface used for emitting light; the thickness between the attachment surface of the optical reflector and the light-out surface decreases gradually from a near light source end to a far light source end, the attachment surface of the reflection sheet is arch-shaped bulging externally; the reflection sheet comprises a reflection surface and the reflection surface is tightly attached on the optical reflector. The utility model has the advantages that the backlight sources can effectively improve the degree of evenness of the backlight source, eliminate the dark spot or dark fringe of the light source, repair the brightness difference between the near end and far end of the distant light source and improve the utilization ratio of light rays which can improve the effectiveness of liquid crystal display screen which uses sidelight type backlight source.
Description
[technical field]
The utility model relates to a kind of backlight of display device.
[background technology]
Backlight is an important devices in the display device, be positioned at the back of display screen, its structure as shown in Figure 1, generally include light source 1, light guide plate 2 and some and cover blooming piece (not shown) on the light guide plate 2, the light 3 that light source 1 sends enters from the light incident sides 23 of light guide plate 2, and the following of light guide plate 2 is reflecting piece attachment surface 21, light 3 reflections that reflecting piece penetrates light source, the exiting surface 22 of light above light guide plate 2 penetrated, and enter into display screen.Because LED is energy-conservation owing to having, volume is little, pollution-free, color saturation advantages of higher, more and more as light source in the LCD backlight source.And be accompanied by the raising of chip development technology and encapsulation technology, the LED product has been complied with the ultra-thin development trend of large-scale of LCD, and replacing CCFL just gradually becomes the market mainstream.According to the position difference of light source, backlight mainly contains two kinds of straight-down negative (being the downside of light source in light guide plate) and side-light types (being the left and right sides of light source in light guide plate).Compare straight-down negative, side-light type more adapts to the trend of LCD slimming, lightweight and low consumption electrification, therefore many employing side-light types design in middle-size and small-size panel.But in the design of large-size panel, side-light type back light remains in following defective: 1) the close to sources end of the close light source on light guide plate and away from the source ends far away of light source, the angle difference that light is injected, the angle of incidence of light of close to sources end is big with respect to the angle of incidence of light of source ends far away.Since the difference of rising angle, the zone that on display screen, exists light to cover after causing being reflected between each LED pointolite, thus on exiting surface, there are blackening or dark fringe.2) if select for use R, G, B LED as light source, then at the close to sources end, three primary colors better are not mixed under the situation of white light, have to liquid crystal to the direction skew away from light source, thereby the size of the liquid crystal panel that reduced to throw light on has also influenced the harmony of display screen outward appearance and attractive in appearance.In addition, far away more apart from light source under the certain situation of light-source brightness, brightness must be low more, and the display effect of liquid crystal is obvious variation also.
[summary of the invention]
Fundamental purpose of the present utility model solves the problems of the prior art exactly, and a kind of backlight is provided, and by the design of optics aspect, improves the uniformity coefficient that backlight light distributes on exiting surface.
Of the present utility model time a purpose just provides a kind of backlight, further improves the uniformity coefficient that backlight light distributes on exiting surface, and for primitive colours LED, can three primary colors be mixed fully at the close to sources end.
Secondary objective of the present utility model just provides a kind of backlight, further improves light utilization, improves the difference of source ends brightness far away and the brightness of close to sources end.
For achieving the above object, the utility model provides a kind of backlight, comprise light source, light guide plate and reflecting piece, described light source is positioned at the light incident sides of light guide plate, described light guide plate comprises and is used for the reflecting piece attachment surface that contacts with reflecting piece and is used for irradiant exiting surface, the reflecting piece attachment surface of described light guide plate and the thickness between the exiting surface reduce to source ends far away gradually from the close to sources end, the reflecting piece attachment surface of described light guide plate is the arc surfaced of evagination, described reflecting piece comprises reflective surface, and described reflective surface and reflecting piece attachment surface are close to.
The arc surfaced of described reflecting piece for matching with the reflecting piece attachment surface.
Further improvement of the utility model is to have net-point shape sphere projection on the reflective surface of described reflecting piece, and circular arc curvature, height and the distribution density of the projection on the described reflective surface followed its residing position and changed.
The circular arc curvature of described projection increases to source ends far away gradually from the close to sources end, the height of described projection increases to source ends far away gradually from the close to sources end, and the density of the projection of described close to sources end is less than the density of the projection of source ends far away and greater than the density of the projection of center section.
Of the present utility model further the improvement is: the source ends far away of described reflective surface comprises also that many light incident sides with light guide plate are parallel, the inclined-plane is towards the prismatic projection of incident light, and the angle between described inclined-plane and the reflective surface is spent greater than 45.
Be coated with reflective material layer on described reflective surface and the projection.
For achieving the above object, the utility model provides a kind of backlight reflecting piece simultaneously, and described reflecting piece comprises reflective surface, and described reflective surface is the arc surfaced of indent.
Further improvement of the utility model is: have net-point shape sphere projection on the reflective surface of described reflecting piece, circular arc curvature, height and the distribution density of the projection on the described reflective surface followed its residing position and changed.
The circular arc curvature of the projection of close to sources end and height are less than the circular arc curvature and the height of the projection of source ends far away on the described reflective surface, and greater than the circular arc curvature and the height of the projection of center section on the reflective surface, the density of the projection of close to sources end and source ends far away is greater than the density of the projection of center section on the described reflective surface.
Of the present utility model further the improvement is: the source ends far away of described reflective surface comprises also that many light incident sides with light guide plate are parallel, the inclined-plane is towards the prismatic projection of incident light, and the angle between described inclined-plane and the reflective surface is spent greater than 45.
The beneficial effects of the utility model are:
1) compares with existing reflecting piece, this reflecting piece agent structure has been selected the cambered surface design for use, on the arc reflective surface, arranged simultaneously the sphere projection, effect by cambered surface and sphere projection, light source projects can be reflexed to the reflecting piece rear end to the partial parallel light of reflective surface front end, because the circular arc curvature of the projection on the reflective surface, height and distribution density are followed its residing position and are changed, the main effect of the projection of close to sources end is the diffuse reflection to light, help the mixing of light, make the more abundant of primaries mixing, thereby can eliminate blackening (dark fringe) phenomenon of exiting surface.
2) source ends far away has been arranged prismatic projection on the reflective surface, by prismatic projection with the light reflection upwards, realizes the more weak purpose of compensation rear end light, for the bigger display screen of area, the difference in brightness of its source ends far away and close to sources end is reduced.
3) at the reflecting piece surface coated reflectorized material of extinction not, to improve the utilization factor of light.
[description of drawings]
Fig. 1 is the diagrammatic cross-section of existing backlight;
Fig. 2 is the diagrammatic cross-section of the backlight of a kind of embodiment of the utility model;
Fig. 3 is the cut-open view of reflecting piece of the present utility model;
Fig. 4 is a reflecting piece reflective surface upper process distribution schematic diagram of the present utility model;
Fig. 5 is that the arc reflective surface is to the effect of light synoptic diagram;
Fig. 6 is sphere projection reflection parallel rays synoptic diagram;
Fig. 7-1, Fig. 7-2 projects different curvature sphere projection back reflection distribution of light synoptic diagram for parallel rays;
Fig. 8 is prismatic projection reflection ray synoptic diagram;
Fig. 9 is the diagrammatic cross-section of the backlight of the another kind of embodiment of the utility model.
[embodiment]
Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Embodiment one:
Please refer to Fig. 2, backlight comprises light source 1, light guide plate 2 and reflecting piece 4, light source 1 is positioned at the light incident sides 23 of a side of light guide plate 2, light guide plate 2 comprises reflecting piece attachment surface 21 and is used for irradiant exiting surface 22, the reflecting piece attachment surface 21 and the thickness between the exiting surface 22 of described light guide plate 2 reduce to source ends 300 far away gradually from close to sources end 100, the reflecting piece attachment surface 21 of described light guide plate 2 is the arc surfaced of evagination, described reflecting piece 4 comprises the reflective surface with net-point shape sphere projection, described reflective surface and reflecting piece attachment surface 21 are close to, for example reflecting piece 4 is sticked on the reflecting piece attachment surface 21, or reflecting piece 4 is pressed on the reflecting piece attachment surface 21 by extraneous pressure.Because of the reflecting piece attachment surface 21 of light guide plate is the arc surfaced of evagination, so reflecting piece 4 is the arc surfaced of the indent that matches with reflecting piece attachment surface 21.The light 3 that light source 1 sends enters from the light incident sides 23 of light guide plate 2, with light 3 reflections that light source penetrates, the exiting surface 22 of light above light guide plate 2 is penetrated by reflecting piece 4, enters into display screen at last.Light source 1 adopts LED usually, also can adopt primitive colours LED side by side.
In the present embodiment, reflecting piece 4 can for flexibility or rigidity, when reflecting piece 4 when being flexible, it can determine shape according to the shape of reflecting piece attachment surface 21.When reflecting piece 4 was rigidity, the reflective surface 41 of reflecting piece 4 was the arc surfaced of indent, matched with the shape of the reflecting piece attachment surface 21 of light guide plate 2, as shown in Figure 3.Has the sphere projection on the reflective surface.According to light reflection principle, can learn that under identical irradiate light, spheric curvature is big more, the reformed degree of light ray propagation direction is also big more, promptly throws to the light of exiting surface many more.In identical irradiate light, under the also identical situation of sphere projection curvature, rising height is high more, and the reformed degree of light ray propagation direction is also big more.Sphere projection 42 residing position differences on the described reflective surface, the optical effect that it rose is also different, therefore circular arc curvature, height and the distribution density of sphere projection 42 are followed its residing position and are changed, the circular arc curvature of each several part sphere projection, distribution density and highly be according to its optical effect set.As shown in Figure 4, at close to sources end 100, the mixing of light is extremely important, and will there be blackening in undercompounding on exiting surface.Therefore the main effect that play of the sphere projection of this part is carried out diffuse reflection to light exactly, has determined that thus the circular arc curvature of sphere projection is less, and is highly lower.For guaranteeing that light mixes fully, its distribution density is bigger.And in source ends 300 far away, for improving the utilization factor of light, the luminance difference of balance and close to sources end just need reflex to exiting surface as much as possible with the place ahead next light of projection, so circular arc curvature, height and the distribution density of the sphere projection of this part are all bigger.The sphere projection of center section 200 plays a transition role, and circular arc curvature and height are between near-end and far-end, and density is also less relatively.In summary, for effectively improving on the exiting surface apart from the luminance difference of light source far-end and near-end, far away more from light source, sphere projection curvature should be big more, highly also high more, and the density of the projection of close to sources end is less than the density of the projection of source ends far away and greater than the density of the projection of center section.In actual fabrication, the concrete numerical value of the circular arc curvature of each several part sphere projection, density and height answers brightness, the distance between each pointolite and the size of backlight of comprehensive reference light source to determine.The density of projection is high more good more, but density is high more, and cost of manufacture is high more.Generally, the brightness of light source is low more, and the density of needed projection is big more comparatively speaking; The size of backlight is big more, and the density of needed projection is also big more comparatively speaking.With close to sources end sphere projection is reference, and its density established standards is: can effectively eliminate pointolite because blackening that forms on exiting surface or the dark fringe that the rising angle and the interval that distributes are brought.Distance light source distal process rises because will be with light guiding exiting surface as much as possible, and to improve light utilization, sphere projection distribution density that therefore should the zone is also bigger, and its density values should be as the criterion to reach optimum efficiency with reference to aggregative indexes such as technology, costs.Zone line sphere projection is a transition portion, and density can be less.
Below in conjunction with the description of drawings present embodiment is how to improve the emergent light uniformity coefficient.
As shown in Figure 5, the parallel rays 301,302,303 that comes from light source projects is through the reflex of arc reflective surface, with the lead end of reflecting piece of light, and horizontal light is changed into the upwards light of projection, thereby compensated the situation of the terminal insufficient light of reflecting piece.And horizontal light 304 also has been directed to the reflecting piece end through the repeatedly reflection of arc reflective surface.Because led light source has certain rising angle, not hard to imagine, the level of its emission and downward light are through the reflex of reflecting piece, part light will be directed to the reflecting piece end, thereby can compensate the luminance difference of source ends far away and close to sources end to a certain extent.
As shown in Figure 6, parallel rays projects on the spherical reflective surface, and its reflection ray diffuses to all directions.Therefore, among Fig. 4, the sphere projection in that reflecting piece close to sources end 100 gathers will play irreflexive effect to the light that light source projects is come, and therefore, can make the more even of light mixing.
Shown in Fig. 7-1, Fig. 7-2, the parallel rays that character is identical projects on the spherical reflective surface of different curvature, and the effect after its reflection is different.Spheric curvature is more little, and the distribution angle of reflection ray is also more little; Spheric curvature is big more, and the distribution angle of reflection ray is also big more.Hence one can see that, the sphere projection that center section 200, source ends 300 two parts far away are arranged among Fig. 4, curvature and density increase gradually, the reflection upwards light proportion of (promptly projecting liquid crystal display) increases gradually, and the light ratio of guiding reflecting piece end reduces gradually, and this has also improved the distribution consistency degree of light to a certain extent.
For the bigger display screen of area, the brightness of the source ends far away of its backlight is less, for improving the brightness of backlight source ends far away, extreme distal end 310 in the source ends far away 300 of reflecting piece is distributed with some parallel prismatic projections 43, as shown in Figure 4, this prismatic projection 43 is parallel with the light incident sides of light guide plate, and the inclined-plane is towards incident light.
As shown in Figure 8, the reflective surface slope of prismatic projection is to design according to the light that the place ahead projection comes, generally, angle between inclined-plane and the reflective surface is greater than 45 degree, purpose guarantees light is farthest reflected upwards exactly, thereby improve emergent light intensity, remedy on the liquid crystal display, also improved the utilization factor of light apart from the luminance difference of light source far-end and near-end away from the Lights section.
Embodiment two:
Please refer to Fig. 9, differently among backlight in the present embodiment and the embodiment one be: light source 1 has two, lays respectively at the left and right sides of light guide plate 2, and the reflecting piece attachment surface of light guide plate 2 is two arcs, arc reflecting piece 4 also has two, is close on the reflecting piece attachment surface.Identical among the structure of reflecting piece 4 and the embodiment one.
In the foregoing description,, on reflective surface and projection, be coated with the not reflectorized material of extinction, form overlayer in order further to strengthen the reflectivity of reflective surface to light.
In sum, the utility model can effectively improve the distribution of light uniformity coefficient of backlight (especially side-light type), eliminate the blackening or the dark fringe of light source near-end, remedy luminance difference apart from light source far-end and near-end, and the utilization factor of raising light, make the display effect of the LCDs of using side-light type back light better.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (12)
1. backlight, comprise light source, light guide plate and reflecting piece, described light source is positioned at the light incident sides of light guide plate, described light guide plate comprises and is used for the reflecting piece attachment surface that contacts with reflecting piece and is used for irradiant exiting surface, it is characterized in that: the reflecting piece attachment surface of described light guide plate and the thickness between the exiting surface reduce to source ends far away gradually from the close to sources end, the reflecting piece attachment surface of described light guide plate is the arc surfaced of evagination, and described reflective surface and reflecting piece attachment surface are close to.
2. backlight as claimed in claim 1 is characterized in that: the arc surfaced of described reflecting piece for matching with the reflecting piece attachment surface.
3. backlight as claimed in claim 1 is characterized in that: described reflecting piece is for flexible.
4. as each described backlight in the claim 1 to 3, it is characterized in that: have net-point shape sphere projection on the reflective surface of described reflecting piece, circular arc curvature, height and the distribution density of the projection on the described reflective surface followed its residing position and changed.
5. backlight as claimed in claim 4, it is characterized in that: the circular arc curvature of described projection increases to source ends far away gradually from the close to sources end, the height of described projection increases to source ends far away gradually from the close to sources end, and the density of the projection of described close to sources end is less than the density of the projection of source ends far away and greater than the density of the projection of center section.
6. backlight as claimed in claim 5 is characterized in that: the source ends far away of described reflective surface also comprises the prismatic projection of many parallel with the light incident sides of light guide plate, inclined-planes towards incident light, and the angle between described inclined-plane and the reflective surface is greater than 45 degree.
7. backlight as claimed in claim 4 is characterized in that: be coated with reflective material layer on described reflective surface and the projection.
8. backlight reflecting piece, it is characterized in that: described reflecting piece comprises reflective surface, described reflective surface is the arc surfaced of indent.
9. reflecting piece as claimed in claim 8 is characterized in that: have net-point shape sphere projection on the reflective surface of described reflecting piece, circular arc curvature, height and the distribution density of the projection on the described reflective surface followed its residing position and changed.
10. reflecting piece as claimed in claim 9, it is characterized in that: the circular arc curvature of the projection of close to sources end and height are less than the circular arc curvature and the height of the projection of source ends far away on the described reflective surface, and greater than the circular arc curvature and the height of the projection of center section on the reflective surface, the density of the projection of close to sources end and source ends far away is greater than the density of the projection of center section on the described reflective surface.
11. reflecting piece as claimed in claim 10 is characterized in that: the source ends far away of described reflective surface also comprises the prismatic projection of many parallel with the light incident sides of light guide plate, inclined-planes towards incident light, and the angle between described inclined-plane and the reflective surface is greater than 45 degree.
12., it is characterized in that: be coated with reflective material layer on described reflective surface and the projection as each described reflecting piece in the claim 8 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201226208U CN201083928Y (en) | 2007-08-30 | 2007-08-30 | Backlight and its reflecting sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201226208U CN201083928Y (en) | 2007-08-30 | 2007-08-30 | Backlight and its reflecting sheet |
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| Publication Number | Publication Date |
|---|---|
| CN201083928Y true CN201083928Y (en) | 2008-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201226208U Expired - Fee Related CN201083928Y (en) | 2007-08-30 | 2007-08-30 | Backlight and its reflecting sheet |
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| CN (1) | CN201083928Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852395A (en) * | 2010-06-22 | 2010-10-06 | 上海向隆电子科技有限公司 | Light guiding assembly |
| CN102943973A (en) * | 2011-08-15 | 2013-02-27 | 中强光电股份有限公司 | Side-entry backlight module |
| CN103017033A (en) * | 2012-12-07 | 2013-04-03 | 康佳集团股份有限公司 | Bilateral optical backlight module |
| WO2013127250A1 (en) * | 2012-02-28 | 2013-09-06 | 天地融科技股份有限公司 | Electronic device |
| WO2016045201A3 (en) * | 2014-09-24 | 2016-05-19 | 深圳Tcl新技术有限公司 | Light guide plate and liquid crystal display device |
| CN106523986A (en) * | 2016-10-31 | 2017-03-22 | 马瑞利汽车零部件(芜湖)有限公司 | Light curtain automobile tail light with gradual change effect |
| JP2017220288A (en) * | 2016-06-03 | 2017-12-14 | 株式会社エイビック | Transparent light guide plate and light reflection sheet used therefor |
-
2007
- 2007-08-30 CN CNU2007201226208U patent/CN201083928Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852395A (en) * | 2010-06-22 | 2010-10-06 | 上海向隆电子科技有限公司 | Light guiding assembly |
| CN101852395B (en) * | 2010-06-22 | 2013-09-04 | 上海向隆电子科技有限公司 | Light guiding assembly |
| CN102943973A (en) * | 2011-08-15 | 2013-02-27 | 中强光电股份有限公司 | Side-entry backlight module |
| WO2013127250A1 (en) * | 2012-02-28 | 2013-09-06 | 天地融科技股份有限公司 | Electronic device |
| CN103017033A (en) * | 2012-12-07 | 2013-04-03 | 康佳集团股份有限公司 | Bilateral optical backlight module |
| WO2016045201A3 (en) * | 2014-09-24 | 2016-05-19 | 深圳Tcl新技术有限公司 | Light guide plate and liquid crystal display device |
| JP2017220288A (en) * | 2016-06-03 | 2017-12-14 | 株式会社エイビック | Transparent light guide plate and light reflection sheet used therefor |
| CN106523986A (en) * | 2016-10-31 | 2017-03-22 | 马瑞利汽车零部件(芜湖)有限公司 | Light curtain automobile tail light with gradual change effect |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Huizhou Biyadi Industry Co., Ltd Assignor: Biyadi Co., Ltd. Contract fulfillment period: 2008.11.1 to 2016.3.31 Contract record no.: 2009440000400 Denomination of utility model: Backlight and its reflecting sheet Granted publication date: 20080709 License type: Exclusive license Record date: 20090525 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.11.1 TO 2016.3.31; CHANGE OF CONTRACT Name of requester: HUIZHOU BIYADI INDUSTRY CO.,LTD. Effective date: 20090525 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080709 Termination date: 20150830 |
|
| EXPY | Termination of patent right or utility model |