CN201126482Y - Construction of optical scattering tablet - Google Patents
Construction of optical scattering tablet Download PDFInfo
- Publication number
- CN201126482Y CN201126482Y CNU2007201275469U CN200720127546U CN201126482Y CN 201126482 Y CN201126482 Y CN 201126482Y CN U2007201275469 U CNU2007201275469 U CN U2007201275469U CN 200720127546 U CN200720127546 U CN 200720127546U CN 201126482 Y CN201126482 Y CN 201126482Y
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- scattering layer
- diffusion sheet
- light
- light source
- optical diffusion
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Abstract
The utility model discloses an optical diffusion sheet construction which mainly comprises at least a light-penetrated layer and at least a scattering layer combined with the light-penetrated layer, diffusion microparticles are equably distributed inside the scattering layer, the face of the scattering layer toward a light resource is a light incidence face, and the opposite face is a light outlet face having at least a curved-surface form, each curved-surface position of the light outlet face can align the upper side of the of the light resource position, the thickness change of the scattering layer is proportional to the logarithm of the light radialization lightness of the lights in different angles and emitted from the nearest light resource, and is inverse-proportional to the concentration of the diffusion microparticles. In this way, the problem of non-uniform lightness of the light resource due to the reduction of the distance between the light resource and the diffusion sheet during module thinning design can be eliminated.
Description
Technical field
The utility model relates to a kind of structure of optical diffusion sheet, in its field relevant for optics, can allow the diffusion sheet of light uniformization, particularly a kind of diffusion sheet that includes the scattering layer structure of variation in thickness, so that light uniformization.
Background technology
General LCD selects to utilize the backlight module framework of straight-down negative or side-light type according to the demand of actual design; If the side light type back light module framework, it mainly utilizes the pattern (site or V-groove) and the diffusion barrier sheet (Diffuser sheet) of light guide plate, to reach the evenly effect of diffusion of light; If direct type backlight module framework, then mainly place a diffusion sheet to reach equal light effect in the light source top, such as on Design of Luminaires for reaching equal light effect, utilize lampshade and a diffusion sheet is set in the openend of lampshade, to allow the light part of light source penetrate through diffusion sheet again from the lampshade reflection, a part is directly penetrated by diffusion sheet, to reach equal optical haze effect.
See also shown in Figure 1, its certificate number is compiled " structural improvement of diffusion sheet " the novel patent case for TaiWan, China patent M294042 number, it discloses is the diffusion sheet 60 of surface diffusion type, utilization is spattered and is crossed, spraying or printing process, the diffusion layer 65 that comprises plural number diffusion particulate 62 in incidence surface 63 (or exiting surface 64) formation one of base material 61, or as shown in Figure 2, diffusion sheet 70 sticks method with particulate and sticks diffusion particulate 72 to form a diffusion layer 75 in the exiting surface 74 of base material 71, to form irregular rough surface, and make light reflection and refraction reach the light diffusion effect, like that is the diffusion barrier sheet that belongs to the surface diffusion type, its base material thickness is thinner, and basic structure is many as Fig. 1, shown in Figure 2.
But with particulate stick, spraying or printing process when the processing procedure because factors such as gravity, viscous force or static easily make diffusion particulate difficulty be uniformly distributed in the adhesive agent, thereby the diffusion layer problem of uneven distribution arranged, move as then needing to carry out mechanical lapping in the surface of base material with lapping mode, can have the structural strength problem of damaging or weakening base material on the processing procedure, aforementioned prior art does not disclose the means of any solution to this problem.
And be to improve the function design that diffusion sheet possesses slimming, be able in light fixture and the application of backlight liquid crystal display modular structure, can reach thinner size, so as shown in Figure 3, its certificate number is compiled and is M268167 number " backlight module with light diffusing sheet " patent case of TaiWan, China patent, it discloses the diffusion sheet 80 of surface diffusion type, the light source 25 of its main cold cathode fluorescent lamp kenel is positioned between reflector plate 90 and the diffusion sheet 80, and diffusion sheet 80 is made thick 88 of big thickness, and forms a thin portion 89 between the two thick portions.Yet because the exiting surface 84 between top board 91 and the diffusion sheet 80 is a plane, incidence surface 83 is for being a convex surface for light source 25, thereby backlight module is when doing slimming, because the variation in thickness rule is inversely proportional to the relation of at least one light source 25 and 91 distances of top board, make that the curve of incidence surface 83 is more crooked, cause thick 88 too thick, the curved surface of thin simultaneously portion 89 and the incident angle of incident light are too big, occur the problem of luminance shortage on the contrary.
The utility model content
Fundamental purpose of the present utility model is to provide a kind of structure of optical diffusion sheet, and it mainly effectively improves the optical uniformity of diffusion sheet, and meaning makes diffusion sheet be applied to backlight module and light fixture, can have more slimming and does not reduce the characteristics of whole optical uniformity and brightness.
The utility model is to adopt following technological means to realize:
A kind of structure of optical diffusion sheet, it mainly comprises at least one photic zone and at least one scattering layer that combines with this photic zone, the inner diffusion particulate that evenly distributes of this scattering layer, this scattering layer is an incidence surface towards this face of light source, another opposite face is an exiting surface, the exiting surface of this scattering layer has at least one curved surface kenel that is, and this exiting surface whenever be the curved surface position can be in alignment with the top of light emitting source position, the variation in thickness of this scattering layer is proportional to the logarithm of the optical radiation brightness that nearest light source radiates in different angles, and is inversely proportional to this and spreads atomic concentration.
The utility model can also adopt following technological means to realize:
A kind of structure of optical diffusion sheet, it mainly comprises at least one photic zone and at least one scattering layer that combines with this photic zone, the inner diffusion particulate that evenly distributes of this scattering layer, this scattering layer is an incidence surface towards this face of light source, another opposite face is an exiting surface, the exiting surface of this scattering layer has at least one curved surface kenel that is, and this exiting surface whenever be the curved surface position can be in alignment with the top of light emitting source position, is to be proportional to the brilliant degree that the plane lamp source is radiated in vertical direction with this scattering layer at vertical direction thickness, and is inversely proportional to this and spreads atomic concentration.
Aforesaid light source is arranged for the one dimension array.
Aforesaid light source is that two-dimensional array is arranged.
Aforesaid photic zone and scattering layer material are translucent material.
Aforesaid its refractive index n of scattering layer material
1With its refractive index n of diffusion particulate
2, the absolute value of both differences | n
1-n
2| between 0～2.
Aforesaid incidence surface, exiting surface, its cross section curve are the single order differentiable function.
The incidence surface of aforesaid scattering layer has at least one concave surface kenel, and the curved surface position alignment of incidence surface is in the light source position top.
The incidence surface of aforesaid scattering layer is the plane.
Aforesaid euphotic exiting surface is plane or tool prism, pyramid, Fresnel lens, lenticular microstructure.
The utility model compared with prior art has following remarkable advantages and beneficial effect:
The main scattering layer of the utility model combines with photic zone, especially be concavo-convex curve at scattering layer itself, the variation in thickness of its scattering layer that forms, make scattering layer thickness system be proportional to nearest light source, the logarithm (logarithm) of the optical radiation brightness that it radiates in different angles, and be inversely proportional to the atomic concentration of diffusion, and scattering layer is matched with inner uniformly dispersing diffusion particulate, therefore in the middle of the slimming design, can eliminate problem because of the distance light luminance inequality that causes that shortens light source and diffusion sheet, obtain diffusion sheet and have slimming fully concurrently, luminance brightness homogenising characteristics, filled and part be applied to backlight module and light fixture, solve slimming in the past and be difficult to make problems such as brightness is even.
Description of drawings
Fig. 1 is the sectional view (exiting surface diffusion layer) of existing surface diffusion type diffusion sheet;
Fig. 2 is the sectional view (sticking method) of existing surface diffusion type diffusion sheet;
Fig. 3 is the sectional view of the diffusion sheet of existing plane of incidence curvilinear motion;
Fig. 4 is the diffusion sheet structural representation of the utility model preferred embodiment;
Fig. 5 is the diffusion sheet structural representation of another preferred embodiment of the utility model;
Fig. 6 is for being applied to diffusion sheet structural representation in the lighting source;
Fig. 7 is the structural representation that is applied to diffusion sheet in the direct type backlight module;
Fig. 8 is the structural representation that is applied to diffusion sheet in the side light type back light module.
Embodiment
Below in conjunction with accompanying drawing specific embodiment of the utility model is illustrated:
The utility model is a kind of structure of optical diffusion sheet, and please referring to shown in Figure 4, diffusion sheet 10 mainly engages the composite bed structure that constitutes by a photic zone 15a with a scattering layer 15.Wherein this photic zone 15a is a translucent material, is exiting surface 16 being in reverse to light source 20 these faces, and exiting surface 16 is the plane, when adding other blooming piece, a good closely contact must be arranged;
And this scattering layer 15 is for including the light transmissive material of equally distributed diffusion particulate 12, change scattering layer 15 THICKNESS CONTROL light transmission rates in order to reach, wherein scattering layer 15 has the incidence surface of injecting for the light of light source 20 13, and the exiting surface 14 that supplies light to penetrate, the incidence surface 13 of scattering layer 15 can be plane or concave surface to each light source 20, and Figure 4 shows that the plane, so can prevent has 41 ° incident angle at the normal and the incident light of the plane of incidence in thin portion 19 zones of scattering layer 15, and scattering layer 15 thickness are proportional to nearest light source, the logarithm (logarithm) of the optical radiation brightness that it radiates in different angles, and be inversely proportional to the concentration of diffusion particulate 12, the exiting surface in the zone of thin portion 19 is 14a.
According to the object of light vertical incidence one thickness x, its light transmission rate is relevant with object thickness and internal particle concentration, can be expressed as following formula:
I＝I
0·exp(-α·x)
I wherein: the optical radiation brightness that penetrates; IO: the optical radiation brightness of incident; α: object is relevant with diffusion particulate concentration to absorption coefficient, the diffusion particulate size of light; X: the thickness of object.(optical radiation brightness definition: the unit projected area of light source on a certain direction, the radiation flux in the unit solid angle)
So after following formula is taken the logarithm, change into
Thereby the scattering layer variation in thickness is got the logarithm (1ogarithm) that is proportional to the light source distribution curve flux and is inversely proportional to the atomic concentration of diffusion.Therefore, represent I1, I2 and the thickness x of optical radiation brightness as shown in Figure 4
1, x
2Need to satisfy
Relation.
Make for ease of diffuser plate, its scattering layer can be reduced at vertical direction thickness and be proportional to the brilliant degree (nits) that the plane lamp source is radiated in vertical direction.
If diffusion sheet 10 shown in Figure 4 is if there is non-level and smooth curvilinear structures to surpass 100 microns persons, for avoiding producing bright dark inequality in this position, the utility model is thin portion 19 zones of thinner thickness at scattering layer 15, exiting surface 14 under it need be designed to smooth curve, such as being that para-curve, circular arc line etc. are done slick and sly a connection, make the exiting surface 14 of whole scattering layer 15 be the single order differentiable curve.
The exiting surface 14 of scattering layer 15 shown in Figure 5 also is the identical practice with incidence surface 13, and only the incidence surface 13 of respective sources 20 is shown as concave surface.Fig. 4, Fig. 5 show scattering layer 15 and the available material of photic zone 15a, such as being transparent silica gel, rubber, epoxy resin (Epoxy), phenolic resin (PMC), heat curing-type hydrosulfamine (Polyamide), polyvinylene (PVC), polystyrene (PP), acryl resin, polycarbonate, quartz or glass.
It is very little that 12 of diffusion particulates in the scattering layer 15 can be titania (TiO2), silicon dioxide (SiO2), talcum, mica, magnesium oxide (MgO), barium sulphate (BaSO4), zinc sulphide (ZnS) or the like extinction coefficient, such as less than 0.1 material, shape then be hollow or solid spherosome, spheroid or other polyhedron Li ?size between 0.1～100 micron, preferred embodiment is between 0.2～10 micron.
This diffusion sheet 10 is used in incandescent lamp, light emitting diode (LED), thermal cathode fluorescent tube (HCFL), cathode fluorescent tube (CCFL) and tabular light source ... there is good diffusion evenly to reach the slimming effect in the optical module Deng light source.
Please consult the sectional view of diffusion sheet 10 Application Examples shown in Figure 6 again, it shows the inner face 31 silver-plated or aluminium film 10a (or be coated with the coating of light reflection performance or be covered with light reflection mould) of a housing 30, and a light source 20 places between lampshade 10 and the utility model diffusion sheet 10, and light source 20 is divided into 20a, 20b, 20c and 20d four districts.The left half of situation of drawing at first is described, because the direct reflection effect well imagines at equidistant d1 to produce imaginary light source 21 and equidistant d2 generation imaginary light source 22.So distribution curve flux of the 20a of light source 20 part, cooperate simultaneously imaginary light source 22 22c district part imaging source and shine on diffusion sheet 10, the light intensity distribution curve flux of the 20b of light source 20 part then is that 21a by light source 21 partly replaces and shines on diffusion sheet 10 in addition.Therefore in the modular structure of slimming, scattering layer 15 variation in thickness are taken as logarithm (logarithm) that is proportional to the light intensity that nearest light source radiates in different angles and the concentration that is inversely proportional to diffusion particulate 12 shown in Figure 4.
In like manner, the right half of situation of drawing is also identical, if light source 20 is incandescent lamp, LED ... Deng pointolite, the exiting surface 14 of scattering layer 15 then please cooperate shown in Figure 4ly, curve form is as umbrella; If light source 20 is HCFL, CCFL ... Deng line source, then exiting surface 14 curve forms of scattering layer 15 are as rectangular carinate.
See also the sectional view of Fig. 7 again, use diffusion sheet 10 of the present utility model can improve in the prior art slimming and equal optical issue about direct type backlight module.Direct type backlight module comprises a housing 301, a reflector plate 42, a plurality of light source 20, a diffusion sheet 10, a diffusion barrier sheet 40 and a brightening film sheet 41, and said modules is combined composition module, and liquid crystal panel 50 is placed on the backlight module.If light source 20 as be periodic arrangement person, then get a cellular construction 55 explanations, it shows that the variation in thickness of its left side scattering layer 15 is that the distribution curve flux that is proportional to 20a and 21b part in the light source 20 shines in the logarithm of diffusion layer 15, and the variation in thickness of the right scattering layer 15 is to be proportional to that the distribution curve flux of 20c and 21d part shines in the logarithm of diffusion layer 15 in the light source 20 in the same cellular construction 55.
See also shown in Figure 4ly, if light source 20 is CCFL (or HCFL), then whole scattering layer 15 shapes in the cellular construction 55 then periodically are replicated in other position on the one dimension direction; If light source 20 is LED and is periodic array arrangement, whole scattering layer 15 shapes in the cellular construction 55 then, then on two-dimensional directional, do also periodically to duplicate, last photic zone 15a is covered on the scattering layer 15, and the exiting surface 16 of photic zone 15a and incidence surface 13 keeping parallelisms of scattering layer 15, other optical sheet then is close to the exiting surface 16 of photic zone 15a.So in the direct type backlight module slimming simultaneously, can keep certain optical uniformity and can not reduce brightness.
The sectional view of preferred embodiment shown in Figure 8 is applied to 7 o'clock following side light type back light modules, comprises a housing 302, a reflector plate 42, a light source 20, a diffusion sheet 102 and a brightening film sheet 41.Equally light source 20 is divided into 20a, 20b, 20c and 20d four districts, at first the distribution curve flux of 20c part directly is radiated on the diffusion sheet 102 through cavity 56 in the light source 20, exiting surface 141 is inclined plane type, and the distribution curve flux of 20d part is through also being radiated on the diffusion sheet 102 through cavity 56 and reflector plate 42 in addition.The variation in thickness of therefore getting scattering layer 15 is that the distribution curve flux of 20c and 21d part shines in the logarithm of diffusion layer 15 in the direct ratio light source 20; As for the light of 20a and 20b part in the light source 20, then after semicircle reflector plate 42 reflections, level enters among the cavity 56, so for the side light type back light module below 7 o'clock, can roughly be considered as being evenly distributed on the diffusion sheet 102 by experimental result.
Therefore at last be that the distribution curve flux of 20c and 21d part shines in the logarithm of diffusion layer 15 in the direct ratio light source 20 for the variation in thickness of the scattering layer 15 of diffusion sheet 102.And the exiting surface 16 of photic zone 15a then keeps parallel with the incident light plane 132 of scattering layer 15, is beneficial to closely attach with brightening film sheet 41.Replace as for the also available light guide plate of cavity 56, the material of diffusion sheet 102 of the present utility model should be selected soft materials for use, as silica gel at this moment.
It should be noted that at last: although this instructions has been described in detail the utility model with reference to each above-mentioned embodiment,, those of ordinary skill still can be made amendment or is equal to replacement the utility model; And all do not break away from the technical scheme and the improvement thereof of utility model, and it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (10)
1. the structure of an optical diffusion sheet, it mainly comprises at least one photic zone and at least one scattering layer that combines with this photic zone, it is characterized in that:
The inner diffusion particulate that evenly distributes of this scattering layer, this scattering layer is an incidence surface towards this face of light source, another opposite face is an exiting surface, the exiting surface of this scattering layer has at least one curved surface kenel that is, and this exiting surface whenever be the curved surface position can be in alignment with the top of light emitting source position, the variation in thickness of this scattering layer is proportional to the logarithm of the optical radiation brightness that nearest light source radiates in different angles, and is inversely proportional to this and spreads atomic concentration.
2. the structure of an optical diffusion sheet, it mainly comprises at least one photic zone and at least one scattering layer that combines with this photic zone, it is characterized in that:
The inner diffusion particulate that evenly distributes of this scattering layer, this scattering layer is an incidence surface towards this face of light source, another opposite face is an exiting surface, the exiting surface of this scattering layer has at least one curved surface kenel that is, and this exiting surface whenever be the curved surface position can be in alignment with the top of light emitting source position, is to be proportional to the brilliant degree that the plane lamp source is radiated in vertical direction with this scattering layer at vertical direction thickness, and is inversely proportional to this and spreads atomic concentration.
3. the structure of optical diffusion sheet according to claim 2 is characterized in that: described light source is that the one dimension array is arranged.
4. the structure of optical diffusion sheet according to claim 2 is characterized in that: described light source is that two-dimensional array is arranged.
5. the structure of optical diffusion sheet according to claim 2, it is characterized in that: described photic zone and scattering layer material are translucent material.
6. the structure of optical diffusion sheet according to claim 2 is characterized in that: described its refractive index n of scattering layer material
1With its refractive index n of diffusion particulate
2, the absolute value of both differences | n
1-n
2| between 0～2.
7. the structure of optical diffusion sheet according to claim 2, it is characterized in that: described incidence surface, exiting surface, its cross section curve are the single order differentiable function.
8. the structure of optical diffusion sheet according to claim 2, it is characterized in that: the incidence surface of described scattering layer has at least one concave surface kenel, and the curved surface position alignment of incidence surface is in the light source position top.
9. the structure of optical diffusion sheet according to claim 2, it is characterized in that: the incidence surface of described scattering layer is the plane.
10. the structure of optical diffusion sheet according to claim 2 is characterized in that: described euphotic exiting surface can be plane or tool prism, pyramid, Fresnel lens, lenticular microstructure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201275469U CN201126482Y (en) | 2007-08-07 | 2007-08-07 | Construction of optical scattering tablet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201275469U CN201126482Y (en) | 2007-08-07 | 2007-08-07 | Construction of optical scattering tablet |
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| Publication Number | Publication Date |
|---|---|
| CN201126482Y true CN201126482Y (en) | 2008-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201275469U Expired - Fee Related CN201126482Y (en) | 2007-08-07 | 2007-08-07 | Construction of optical scattering tablet |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090314A (en) * | 2014-05-19 | 2014-10-08 | 李�远 | Optical active diffusion sheet |
| CN106393918A (en) * | 2016-08-29 | 2017-02-15 | 浙江强盟实业股份有限公司 | Delustering white polyester film and preparation method therefor |
| CN107435818A (en) * | 2016-05-26 | 2017-12-05 | 技嘉科技股份有限公司 | Luminous Ring and radiator fan |
| CN109655949A (en) * | 2019-02-22 | 2019-04-19 | 海迪科（南通）光电科技有限公司 | It is a kind of uniformly to go out light diffusing sheet structure and its manufacturing method |
| CN110794614A (en) * | 2018-08-03 | 2020-02-14 | 日亚化学工业株式会社 | Light emitting module |
| CN112684533A (en) * | 2019-10-17 | 2021-04-20 | 现代摩比斯株式会社 | Light guide and method for sequentially illuminating a light guide |
-
2007
- 2007-08-07 CN CNU2007201275469U patent/CN201126482Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090314A (en) * | 2014-05-19 | 2014-10-08 | 李�远 | Optical active diffusion sheet |
| CN104090314B (en) * | 2014-05-19 | 2019-02-19 | 北醒（北京）光子科技有限公司 | Optics active diffusion sheet |
| CN107435818A (en) * | 2016-05-26 | 2017-12-05 | 技嘉科技股份有限公司 | Luminous Ring and radiator fan |
| CN106393918A (en) * | 2016-08-29 | 2017-02-15 | 浙江强盟实业股份有限公司 | Delustering white polyester film and preparation method therefor |
| CN110794614A (en) * | 2018-08-03 | 2020-02-14 | 日亚化学工业株式会社 | Light emitting module |
| CN109655949A (en) * | 2019-02-22 | 2019-04-19 | 海迪科（南通）光电科技有限公司 | It is a kind of uniformly to go out light diffusing sheet structure and its manufacturing method |
| CN112684533A (en) * | 2019-10-17 | 2021-04-20 | 现代摩比斯株式会社 | Light guide and method for sequentially illuminating a light guide |
| CN112684533B (en) * | 2019-10-17 | 2023-08-22 | 现代摩比斯株式会社 | Light guide device and method for sequentially illuminating light guide devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081001 Termination date: 20120807 |