CN101644855A - Direct backlight module - Google Patents
Direct backlight module Download PDFInfo
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- CN101644855A CN101644855A CN200810303354A CN200810303354A CN101644855A CN 101644855 A CN101644855 A CN 101644855A CN 200810303354 A CN200810303354 A CN 200810303354A CN 200810303354 A CN200810303354 A CN 200810303354A CN 101644855 A CN101644855 A CN 101644855A
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- optical sheet
- strip
- incidence surface
- mode set
- down straight
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Abstract
The invention relates to a direct backlight module which comprises a frame, a plurality of light-emitting diodes, a diffusion plate and a first optical plate, wherein the light-emitting diodes are arranged on a bottom plate of the frame, the first optical plate is arranged above the light-emitting diodes, and the diffusion plate is arranged above the first optical plate at intervals; the first optical plate comprises a light entry surface and a light exit surface which is opposite to the light entry surface; a light entry surface of the first optical plate is close to the light-emitting diodes; the first optical plate also comprises a plurality of V-shaped ridge structures which are formed at the light entry surface, extend along at least two different directions, and are mutually staggered. The direct backlight module has better exit ray uniformity and is suitable for thinned design.
Description
Technical field
The present invention relates to a kind of down straight aphototropism mode set, relate in particular to a kind of down straight aphototropism mode set that is applied to liquid crystal display.
Background technology
Liquid crystal indicator is widely used in the electronic products such as personal digital assistant, notebook computer, digital camera, mobile phone, LCD TV.But because liquid crystal indicator itself can not be luminous, so it need could produce Presentation Function by down straight aphototropism mode set.
See also Fig. 1, a kind of down straight aphototropism mode set 100 comprises framework 10, reflecting plate 12, a plurality of LED light emitting diode pointolite 14, a diffuser plate 16 and an a plurality of optical sheet 18.These a plurality of LED light emitting diode pointolites 14 are arranged on the base plate of framework 10, and a plurality of optical sheets 18 are covered on the opening part of framework 10.Diffuser plate 16 is arranged between LED light emitting diode pointolite 14 and a plurality of optical sheet 18, thereby will be divided into first and second diffusion space 15,17 in the framework 10.
During use, the light that is produced by a plurality of LED light emitting diode pointolites 14 enters diffuser plate 16 after through first diffusion space 15, after diffuser plate 16 diffusions, light enters second diffusion space 17 and spreads, after passing through the diffusion or congregation of a plurality of optical sheets 18 at last, evenly outgoing in the certain viewing angles scope.Yet, though the light that sends from LED light emitting diode pointolite 14 through repeatedly diffusion, but still is difficult to avoid the generation of light emitting diode pointolite 14 light source ghosts.In order to reduce the generation of light source ghost as far as possible, industry can increase the degree of depth of framework 10 usually, promptly increases the height of first and second diffusion space 15,17, perhaps increases the density of arranging of LED light emitting diode pointolite 14.Yet if increase the brightness that the degree of depth of framework 10 will reduce emergent light, if increase the density of arranging of LED light emitting diode pointolite 14, the power that can increase consumption raises the cost.And the degree of depth that increases framework 10 will make the thickness of down straight aphototropism mode set 100 bigger, be difficult to satisfy the slimming designing requirement.
Summary of the invention
In view of above-mentioned condition, be necessary to provide the down straight aphototropism mode set of the lower and thinner thickness of a kind of cost.
A kind of down straight aphototropism mode set, it comprises a framework, a plurality of light emitting diode, a diffuser plate and one first optical sheet.A plurality of light emitting diodes are arranged on the chassis base.First optical sheet is arranged at this light emitting diode top, and diffuser plate is arranged at first optical sheet top.First optical sheet comprises incidence surface and the exiting surface relative with this incidence surface.The incidence surface of first optical sheet is near light emitting diode.First optical sheet also comprises a plurality of V-arrangement ridge structures of at least two the different directions extensions in edge that are formed at incidence surface, and this is interlaced along V-arrangement ridge structure that different directions extends.
Above-mentioned down straight aphototropism mode set is provided with one first optical sheet between light emitting diode and diffuser plate, and the first optical sheet incidence surface is formed with along at least two different directions extensions and interlaced a plurality of V-arrangement ridge structures.Wherein a part is in the incidence surface generation total reflection of first optical sheet for the light of light emitting diode outgoing, and this is reflected and spread by frame inner wall by the light of total reflection.Incident ray enters after first optical sheet, carry out twice refraction at incidence surface and exiting surface, make the light that sends from light emitting diode spread to both sides after first optical sheet, the irradiation area of emergent ray is expanded to form to all around has the larger area area source.Thereby,, satisfy lower cost and slimming designing requirement even adopt the light emitting diode of lesser amt or the framework of the more shallow degree of depth still can form uniform area light source.
Description of drawings
Fig. 1 is a kind of diagrammatic cross-section of down straight aphototropism mode set.
Fig. 2 is the diagrammatic cross-section of the down straight aphototropism mode set of the embodiment of the invention one.
Fig. 3 is the stereographic map of first optical sheet of down straight aphototropism mode set shown in Figure 2.
Fig. 4 is the stereographic map of second optical sheet of down straight aphototropism mode set shown in Figure 2.
Fig. 5 is the cut-open view of the second optical sheet V-V direction shown in Figure 4.
Fig. 6 is the cut-open view of the second optical sheet VII-VII direction shown in Figure 4.
Fig. 7 is the stereographic map of first optical sheet of the down straight aphototropism mode set of the embodiment of the invention two.
Embodiment
Below in conjunction with the accompanying drawings and the specific embodiments down straight aphototropism mode set of the present invention is described in further detail.
Figure 2 shows that the down straight aphototropism mode set 200 of the embodiment of the invention one, it comprises framework 21 with an openend, be arranged at a plurality of light emitting diodes 22 on framework 21 base plates, diffuser plate 24, first optical sheet 23 and one second optical sheet 25.The diffuser plate 24 and second optical sheet 25 are set in turn in the openend of framework 21.First optical sheet 23 is arranged at light emitting diode 22 tops and mutually close with light emitting diode 22.Keep at a certain distance away between first optical sheet 23 and the diffuser plate 24, form a diffusion space 26.
Framework 21 can be made by metal or plastics that the surface has a high reflectance, and also wall coating within it has the coating of high reflectance, so that light can reflect in framework 21 fully.Framework 21 also has supporting construction and is used for carrying and supports light emitting diode 22, diffuser plate 24, first optical sheet 23 and second optical sheet 25.
See also Fig. 3, first optical sheet 23 is made by transparent material, and it comprises incidence surface 231 and the exiting surface 232 relative with incidence surface 231, and wherein, exiting surface 232 is the plane.First optical sheet 23 forms a plurality of along first direction X at incidence surface 231
1The V-arrangement ridge structure 234a that extends, a plurality of along second direction X
2The V-arrangement ridge structure 234b that extends, a plurality of along third direction X
3The V-arrangement ridge structure 234c that extends and a plurality of along the four directions to X
4The V-arrangement ridge structure 234d that extends.Above-mentioned V-arrangement ridge structure is interlaced.Wherein, along second direction X
2The V-arrangement ridge structure 234b that extends with along the four directions to X
4The V-arrangement ridge structure 234d that extends all passes through along first direction X
1The V-arrangement ridge structure 234a that extends with along third direction X
3Intersection point between the V-arrangement ridge structure 234c that extends.Four direction X
1, X
2, X
3And X
4In angle between the adjacent both direction be 45 degree, the drift angle of V-arrangement ridge structure can be 80 degree to 100 degree, the equidirectional centre distance that between the adjacent V-arrangement ridge structure can be 0.025 millimeter to 1 millimeter.In the present embodiment, four direction X
1, X
2, X
3And X
4Centre distance between the adjacent V-arrangement ridge structure is D respectively
1, D
2, D
3With D
4,
Above-mentioned along four direction X
1, X
2, X
3And X
4The a plurality of interconnective triangular pyramid grooves 234 of the interlaced formation of a plurality of V-arrangement ridge structures that extend with common tie point.Interconnective sidewall with triangular pyramid groove 234 of common tie point forms four jiaos of stars 236, and a plurality of four jiaos of stars, 236 rectangular array arrangements.In addition, need to prove:, can adjust the rate of adding lustre to and the bright dipping visual angle of first optical sheet 23 to a certain extent by adjusting the size of drift angle.
The general thickness T of first optical sheet 23 can be 0.4 millimeter to 4 millimeters.First optical sheet 23 can be formed by one or more the material injection mo(u)lding in polymethylmethacrylate, polycarbonate, polystyrene, the styrene methyl methacrylate multipolymer.Need in the preparation process on mould, to be provided with and triangular pyramid groove 234 corresponding bulge-structures, so that make first optical sheet 23 can moulding in the single injection process.
Please refer again to Fig. 2, diffuser plate 24 is a flat board, and it is made up of the transparent material that is dispersed with scattering particle 242, and scattering particle 242 can be one or more the potpourri in titanium dioxide fine particles, silicon dioxide microparticle and the acryl resin particulate.Be appreciated that by adjusting scattering particle 242 and the ratio between the material that constitutes diffuser plate 24 transparent bodies and can regulate the transmittance of diffuser plate 24 that it is preferable selection that the transmittance of diffuser plate 26 is controlled at more than 80%.
See also Fig. 4 to Fig. 6, second optical sheet 25 is made by transparent material, and it comprises an incidence surface 251 and the exiting surface 252 relative with incidence surface 251.The exiting surface 252 of second optical sheet 25 is formed with a plurality of strip V-type projection 256 and strip arc convex 258 of alternately arranging and being parallel to each other.The incidence surface 251 of second optical sheet 25 is formed with a plurality of strip arc grooves 259 that are parallel to each other.These a plurality of strip V-type projectioies 256 or the bearing of trend of strip arc convex 258 and the bearing of trend of a plurality of strip arc grooves 259 intersect.In the present embodiment, the bearing of trend of these a plurality of strip V-type projectioies 256 or strip arc convex 258 is vertical mutually with the bearing of trend of a plurality of strip arc grooves 259.The vertical cross-section of this strip arc convex 258 is a semicircular arc, and the vertical cross-section of this strip arc groove 259 is a semicircular arc.Be appreciated that the strip arc convex 258 and the vertical cross-section of strip arc groove 259 also can be ellipse arc.Optical effects such as specific refraction, reflection and diffraction can take place in the light of injecting second optical sheet 25 by incidence surface 251.Wherein, strip arc groove 259 is used to restrain the angle of radiation of diffuse underneath plate 24 emergent lights, and strip V-type projection 256 and strip arc convex 258 carry out the secondary light harvesting with light at exiting surface 252.
The width of strip V-type projection 256 is designated as D, and drift angle is designated as θ, highly is designated as H
1Then D, θ, H
1Satisfy following relational expression: 0.025 millimeter≤D≤1 millimeter, 80 degree≤θ≤100 degree, 0.01 millimeter≤H
1≤ 3 millimeters.The width of strip arc convex 258 is designated as L, and radius is designated as R, highly is designated as H
2, then L, R, H
2Satisfy following relational expression: 0.025 millimeter≤L≤1.5 millimeters, L/4≤R≤2L, 0.01 millimeter≤H
2≤ R.By regulating D, θ, H
1, L, R, and H
2Numerical value, can adjust the shape of strip V-type projection 256 and strip arc convex 258, thereby regulate the rate of adding lustre to and the bright dipping visual angle of second optical sheet 25.
The spacing of adjacent two strip arc grooves 259 is designated as p, and radius is designated as r, highly is designated as h, and then p, r and h satisfy following relational expression: 0.025 millimeter≤p≤1.5 millimeters, and p/4≤r≤2p, 0.01 millimeter≤h≤r.By regulating the numerical value of p, r and h, can adjust the surface curvature and the spacing of strip arc groove 259, thereby regulate the diffusion effect of 259 pairs of incident lights of strip arc groove.
Second optical sheet 25 can be formed by one or more the material injection mo(u)lding in polymethylmethacrylate, polycarbonate, polystyrene, the styrene methyl methacrylate multipolymer.Need in the preparation process on mould, to be provided with and strip V-type projection 256 and strip arc convex 258 corresponding sunk structures, and with strip arc groove 259 corresponding projective structures so that make second optical sheet 25 moulding in the single injection process.
Second optical sheet 25 adopts the mode of injection mo(u)lding one-body molded, strip V-type projection 256 on it and other parts of strip arc convex 258 and optical sheet 25 form together, therefore can make strip V-type projection 256 and strip arc convex 258 have higher structural strength, the adhesion of strip V-type projection 256 and strip arc convex 258 and second optical sheet, 25 other parts can also be promoted simultaneously, thereby strip V-type projection 256 and the in use impaired danger of strip arc convex 258 can be avoided or reduce.Second optical sheet 25 has the advantage that point luminescent diode directly is converted to equally distributed area source.The strip V-type projection 256 of the exiting surface 252 of second optical sheet 25 can be omitted, and a plurality of strip arc convex 258 that are parallel to each other only are set, the bearing of trend of strip arc convex 258 is vertical mutually with the bearing of trend of a plurality of strip arc grooves 259 of exiting surface 252.
For further promoting the homogeneity of area source, two or more optical sheets 30 can also be set above second optical sheet 25, and with the exiting surface of the optical sheet 30 that is positioned at the top exiting surface as module 20 backlight.Optical sheet 30 can be light diffusing sheet, brightening piece or reflecting polarized wafer.
In down straight aphototropism mode set 200, the incidence surface 231 of first optical sheet 23 is mutually close with these a plurality of light emitting diodes 22 tops, and distance between the two is less than or equal to 3 millimeters.The diffuser plate 24 and first optical sheet 23 have a preset height in vertical direction, and the scope of its height is more than or equal to 10 millimeters.In the present embodiment, the vertical range between the exiting surface 232 of diffuser plate 24 incidence surfaces and first optical sheet 23 is 10 millimeters.Certainly, the distance of the two can actual conditions adjust, and usually, under the identical situation of outgoing light homogeneity, the degree of depth of framework 21 becomes anti-duplicate ratio with the quantity of light emitting diode 22.When the quantity of light emitting diode 22 more for a long time, the degree of depth of framework 21 is less, first optical sheet 23 can be provided with smallerly with diffuser plate 24 distance at interval.When the negligible amounts of light emitting diode 22, the degree of depth of framework 21 is bigger, and first optical sheet 23 correspondingly is provided with more greatly with diffuser plate 24 distance at interval.
During use, the light that light emitting diode 22 sends directly or enter after the reflection of framework 21 inwalls in first optical sheet 23.Wherein, roughly total reflection takes place in the light of outgoing at incidence surface 232 places directly over light emitting diode 22, afterwards again through the reflection of framework 21 inwalls, diffuse into first optical sheet 23.Because the refractive index of first optical sheet, 23 materials is different from the refractive index of air, the light that is incident to first optical sheet 23 reflects at incidence surface 231 and exiting surface 232 places, makes the irradiation area of light emitting diode 22 have the larger area area source to expanding formation all around.In addition, the refraction that light takes place at first optical sheet, 23 exiting surfaces, 232 places also can be with light to the front face brightness of diffuser plate 24 direction correctings with lifting light, and the bright spot that light emitting diode 22 tops occur also improves.Light after diffusion space 26 diffusions enters diffuser plate 24 and further spreads, and spares light and gathering by second optical sheet 25 more afterwards, at last by optical sheet 30, forms uniform surface light source at optical sheet 30 exiting surfaces that are positioned at the superiors.
Be appreciated that second optical sheet 25 also can omit, only the light that a plurality of light emitting diodes 22 are sent of the optical effect by first optical sheet 23 and diffuser plate 24 forms uniform surface light source.
Fig. 7 is first optical sheet 43 of the embodiment of the invention two, its first optical sheet 23 to embodiment one is similar, make by transparent material, it comprises incidence surface 431 and the exiting surface 432 relative with this incidence surface 431, and difference is: the incidence surface 431 of this first optical sheet 43 is formed with by a plurality of along first direction X
1The V-arrangement ridge structure 434a that extends, a plurality of along second direction X
2The V-arrangement ridge structure 434b that extends and a plurality of along third direction X
3The V-arrangement ridge structure 434c that extends.Above-mentioned a plurality of V-arrangement ridge structure is interlaced.Wherein, along third direction X
3The V-arrangement ridge structure 434c that extends passes through along first direction X
1The V-arrangement ridge structure 434a that extends with along second direction X
2Intersection point between the V-arrangement ridge structure 434b that extends.First direction X
1With second direction X
2Between angle be 90 the degree, third direction X
3With first, second direction X
1, X
2Angle be respectively 45 degree and 135 and spend.Three direction X
1, X
2, X
3Interconnective triangular pyramid connected in star of the interlaced formation of V-arrangement ridge structure 435 and rectangular pyramid connected in star 436, wherein each rectangular pyramid groove 436 is surrounded by four adjacent triangular pyramid grooves 435.First optical sheet 43 can make the light of outgoing that specific diffusion takes place, and it is less with the angle of exiting surface 432 that light penetrates the back from first optical sheet 43.Like this, light through long light path, helps strengthening the space diffusion effect in framework 21.
Be appreciated that in the present invention the incidence surface of first optical sheet also can be formed with a plurality of strip V-type ridge structures that extend along two different directions, this intersects vertically along a plurality of strip V-type ridge structures that different directions extends.
In addition, those skilled in the art also can do other variation in spirit of the present invention.Certainly, the variation that these are done according to spirit of the present invention all should be included in the present invention's scope required for protection.
Claims (10)
1. down straight aphototropism mode set, it comprises a framework, a plurality of light emitting diodes, a diffuser plate and one first optical sheet, these a plurality of light emitting diodes are arranged on this chassis base, it is characterized in that: this first optical sheet is arranged at this light emitting diode top, this diffuser plate is arranged at this first optical sheet top, this first optical sheet comprises an incidence surface and the exiting surface relative with this incidence surface, the incidence surface of this first optical sheet is near light emitting diode, this first optical sheet also comprises a plurality of V-arrangement ridge structures of at least two the different directions extensions in edge that are formed at incidence surface, and this is interlaced along a plurality of V-arrangement ridge structures that different directions extends.
2. down straight aphototropism mode set as claimed in claim 1 is characterized in that: these a plurality of V-arrangement ridge structures that are formed at the first optical sheet incidence surface extend along two different directions, and this intersects vertically along the V-arrangement ridge structure that two different directions extend.
3. down straight aphototropism mode set as claimed in claim 1: it is characterized in that: these a plurality of V-arrangement ridge structures that are formed at the first optical sheet incidence surface extend along three different directions, and a plurality of V-type ridge structures that extend along one of them direction are by the intersection point between a plurality of V-type ridge structures that extend along two other different directions and intersect.
4. down straight aphototropism mode set as claimed in claim 1, it is characterized in that: these a plurality of V-arrangement ridge structures that are formed at the first optical sheet incidence surface extend along four different directions, and the edge wherein V-arrangement ridge structure of both direction extension is passed through along the intersection point between the V-arrangement ridge structure of two other direction extension.
5. down straight aphototropism mode set as claimed in claim 1, it is characterized in that: this module backlight comprises that further one is arranged at second optical sheet of diffuser plate top, this second optical sheet comprises an incidence surface and the exiting surface relative with this incidence surface, this second optical sheet also comprises a plurality of strip arc convex that are parallel to each other that are formed at exiting surface, and a plurality of strip arc grooves that are parallel to each other that are formed at incidence surface, the bearing of trend of these a plurality of strip arc grooves intersects with the bearing of trend of these a plurality of strip arc convex.
6. down straight aphototropism mode set as claimed in claim 5 is characterized in that: this second optical sheet further comprises a plurality of strip V-type projectioies that are parallel to each other that are formed at exiting surface, and this strip V-type projection intersects vertically with this strip arc convex.
7. down straight aphototropism mode set as claimed in claim 5, it is characterized in that: this second optical sheet further comprises a plurality of strip V-type projectioies that are parallel to each other that are formed at exiting surface, and these a plurality of strip V-type projectioies are alternately arranged and are parallel to each other with these a plurality of strip arc convex.
8. down straight aphototropism mode set as claimed in claim 5 is characterized in that: the vertical cross-section of this strip arc groove and this strip arc convex is one of circular arc and ellipse arc.
9. down straight aphototropism mode set as claimed in claim 5 is characterized in that: this first optical sheet, second optical sheet are formed by one or more the material injection mo(u)lding in polymethylmethacrylate, polycarbonate, polystyrene, the styrene-methylmethacrylate copolymer.
10. down straight aphototropism mode set as claimed in claim 1, it is characterized in that: the distance between the incidence surface of this first optical sheet and this a plurality of LED top is less than or equal to 3 millimeters, and the distance between this first optical sheet and the diffuser plate is more than or equal to 10 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810303354A CN101644855A (en) | 2008-08-04 | 2008-08-04 | Direct backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810303354A CN101644855A (en) | 2008-08-04 | 2008-08-04 | Direct backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101644855A true CN101644855A (en) | 2010-02-10 |
Family
ID=41656795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810303354A Pending CN101644855A (en) | 2008-08-04 | 2008-08-04 | Direct backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101644855A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287714A (en) * | 2011-08-19 | 2011-12-21 | 上海交通大学 | Backlight system with optical grating |
| CN103206618A (en) * | 2012-01-13 | 2013-07-17 | 刘武强 | Method and device capable of scattering directional light beams, and lighting lamp |
| CN104791665A (en) * | 2015-04-23 | 2015-07-22 | 京东方科技集团股份有限公司 | Backlight module, display device and diffusion plate |
-
2008
- 2008-08-04 CN CN200810303354A patent/CN101644855A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287714A (en) * | 2011-08-19 | 2011-12-21 | 上海交通大学 | Backlight system with optical grating |
| CN103206618A (en) * | 2012-01-13 | 2013-07-17 | 刘武强 | Method and device capable of scattering directional light beams, and lighting lamp |
| CN104791665A (en) * | 2015-04-23 | 2015-07-22 | 京东方科技集团股份有限公司 | Backlight module, display device and diffusion plate |
| CN104791665B (en) * | 2015-04-23 | 2017-05-10 | 京东方科技集团股份有限公司 | Backlight module, display device and diffusion plate |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100210 |