CN101652680A - Optical sheet and light source using the optical sheet - Google Patents
Optical sheet and light source using the optical sheet Download PDFInfo
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- CN101652680A CN101652680A CN200880010444A CN200880010444A CN101652680A CN 101652680 A CN101652680 A CN 101652680A CN 200880010444 A CN200880010444 A CN 200880010444A CN 200880010444 A CN200880010444 A CN 200880010444A CN 101652680 A CN101652680 A CN 101652680A
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Abstract
Provided is an excellent optical sheet wherein mohr is eliminated and optical defects are not generated. The optical sheet for a backlight unit for a liquid crystal display is provided with at least one of a prism structure, a lens structure and a lenticular structure on a base material front surface. The base material rear surface of the optical sheet has a shape having periodic arrangement. Theperiodicity of arrangement of the base material rear surface shape is identical to that on the base material front surface.
Description
Technical field
The present invention relates to the employed optical sheet of backlight module and the light source of liquid crystal indicator.
Background technology
Advantages such as that liquid crystal indicator has is slim, small-sized, low power consumption are used to the display part of clock, desktop computer, TV, PC etc. now.And then, be used to a lot of purposes such as navigational system, view finder, portable terminal computer, estimate that its market also can further enlarge from now on.
Liquid crystal indicator has 3 types: the reflection-type that reflection shows from the light of the light of outside incident or preceding light modulation, the infiltration type that shows with the light of backlight, use are from the semi-transmission type of two kinds of functions of light of the light of outside incident and backlight.For the display part of TV, PC etc., because through being everlasting indoor watching, so infiltration type is a main flow; For portable terminal computers such as portable phones, in order all to obtain identical display quality in outdoor, indoor, night etc., semi-transmission type becomes main flow.Therefore, nearly all liquid crystal indicator all is built-in with backlight module.
Directly-below type and the light source that backlight module has light source to be positioned at liquid crystal panel below be positioned at the side, with light guide plate with end face irradiation (Edge Light) type of photoconduction to panel, pay attention to portable machine and mostly be end face irradiation type.The structure of the backlight module of end face irradiation type as shown in Figure 1, makes the light of the fluorescent light 1 that becomes backlight inject light guide plate 3 from the side, for diffusion sheet 4 that light is led efficiently, reflector plate 2 is set below light guide plate 3.For will be by the light that diffusion sheet 4 spreads high briliancyization, usually, configuration multi-disc prismatic lens 5.In addition, further dispose diffusion sheet sometimes thereon.Recently, for the high briliancyization of backlight, the purpose of minimizing component parts, begin requirement prismatic lens 5 is made the such a slice prism mode of a slice.
The structure of the backlight module of this a slice prism mode as shown in Figure 2, makes the light of the fluorescent light 1 that becomes backlight inject light guide plate 3 from the side, for prismatic lens 5 that light is led efficiently, reflector plate 2 is set below light guide plate 3.The light that directive property is only arranged from this light guide plate 3 penetrates for by prismatic lens 5 high briliancyization, makes its further diffusion, and diffusion sheet 4 is set.This mode has the briliancy height, the advantage that the prismatic lens number reduces.
So, in backlight module, dispose multi-disc optical sheets such as prismatic lens, diffusion sheet.During the overlay configuration optical sheet, have space between sheet and cause interference fringe or produce by the sheet problem of the optical defect that causes of driving fit each other.As the method that addresses this is that, proposed to form the method (patent documentation 1, patent documentation 2) of microspike at sheet back side disperse particles, also proposed the master mold of making by machining is impressed molded, formed the method (patent documentation 3) of highly irregular projection.In addition, for the purpose of high briliancyization, proposed to dispose the method (patent documentation 4, patent documentation 5) that the two sides is formed with the sheet of prism.
Patent documentation 1: No. 2951525 communique of Japan's special permission
Patent documentation 2: Japanese kokai publication hei 10-300908 communique
Patent documentation 3: Japanese Unexamined Patent Application Publication 2002-536702 communique
Patent documentation 4: TOHKEMY 2000-56106 communique
Patent documentation 5: TOHKEMY 2000-56107 communique
Summary of the invention
The problem that invention will solve
Like this, all form the optical sheet of fine shape with regard to base material front, the back side, when the two sides all has periodically, produce Moire fringe between the periodicity in base material front and the periodicity of substrate backside, even the sheet monomer also can identification, the outward appearance of backlight module becomes bad.Therefore, the purpose of this invention is to provide a kind of good optical sheet that prevents Moire fringe, do not produce optical defect.
The means of dealing with problems
Discoveries such as the inventor: the periodicity in periodicity and base material front of substrate backside shape by making the used base material front of backlight module, the back side all form the optical sheet of fine shape is same period, be below the 20 μ m perhaps by the periodicity that makes the substrate backside shape, the good optical sheet that can make and prevent Moire fringe, does not produce optical defect.
Promptly, optical sheet of the present invention is the backlight module optical sheet of liquid crystal indicator, it is the positive at least a structure that forms in prism structure, lens arrangement, the biconvex lens structure of base material, substrate backside forms the optical sheet of the shape with periodic arrangement, and the periodicity of substrate backside shape is same period with the periodicity in base material front.The periodicity of preferred especially described base material front shape and substrate backside shape is 40～50 μ m.And then the periodicity of more preferably described base material front shape and substrate backside shape is 44～48 μ m, especially is preferably 46 μ m.
In addition, in order to address the above problem, optical sheet of the present invention is the backlight module optical sheet of liquid crystal indicator, it is the positive at least a structure that forms in prism structure, lens arrangement, the biconvex lens structure of base material, substrate backside forms the optical sheet of the shape with periodic arrangement, and the periodicity of substrate backside shape is below the 20 μ m.In addition, the periodicity of preferred described base material front shape is 40～50 μ m.And then the periodicity of more preferably described base material front shape is 44～48 μ m, especially is preferably 46 μ m.
Light source of the present invention disposes described optical sheet and light conductor.
The invention effect
According to the present invention, a kind of good optical sheet that prevents Moire fringe, optical defect does not take place can be provided, and the light source that uses this optical sheet.
Description of drawings
Fig. 1 is the sectional view that is used to illustrate the structure of backlight module in the past.
Fig. 2 is the sectional view that is used to illustrate the structure of a slice lens type backlight module in the past.
Fig. 3 is the sectional view of an example of the structure of expression optical sheet of the present invention.
Fig. 4 is the sectional view of other examples of the structure of expression optical sheet of the present invention.
Fig. 5 is the sectional view of an example of the manufacturing process of the transfer printing master mold that uses of expression the present invention.
Fig. 6 is the sectional view of an example of the manufacturing process of expression optical sheet of the present invention.
Symbol description
1. light source (fluorescent light)
2. reflector plate
3. light guide plate
4. diffusion sheet
5. prismatic lens
6. diamond segment
7. base material roller
8. prism structure
9. ultraviolet lamp
10. supply head
11. roller shape transfer printing master mold
12. niproll
13. base material
14. resin bed
Embodiment
Below, describe being used to implement best mode of the present invention.This embodiment is the used optical sheet of the backlight module of liquid crystal indicator, is the backlight module that is particularly suitable for end face irradiation type, can be used to replace for example 2 prismatic lens of above-mentioned backlight modular structure shown in Figure 1.
With reference to Fig. 1, make the light of the fluorescent light 1 that becomes backlight inject light guide plate 3 from the side, reflecting plate 2 is set from light guide plate 3 guiding diffusion sheets 4, light is injected from diffusion sheet 4 made the optical sheet that prismatic lens uses, make this optical sheet of light transmission.
This optical sheet, as shown in Figure 3, by base material 13, transfer printing roller shape transfer printing master mold described later back side fine shape resin bed 14 and constitute in positive layers 8 of the structure likely that forms of base material.
Particularly, the layer 8 in the base material front periodically disposes prism shape with prescribed distance P.As front shape, except that prism structure, also can form lens arrangement, biconvex lens structure.Form at least a the getting final product in these structures.In addition, at the resin bed 14 of substrate backside, be formed with the protuberance that for example has sphere with the cycle (prescribed distance P) identical with the periodicity in front.Prescribed distance P for example is preferably 40～50 μ m, and more preferably 44～48 μ m especially are preferably 46 μ m.
In addition, the resin bed 14 of substrate backside as shown in Figure 4, also can form the protuberance with inconsistent cycle of periodicity of layer 8 the prism shape of face side, and to make spacing be below the 20 μ m but cycle this moment is preferably.And the spacing of the prism shape of the face side layer 8 of Fig. 3 and Fig. 4 is different scales.
The shape of optical sheet substrate backside of the present invention also can similarly form in prism structure, lens arrangement, the biconvex lens structure any with front shape.In addition, round dot pattern that also can design rule, polygon pattern etc. are concavo-convex.Can change the shape at this back side by the minute shape on control transfer printing master mold surface.
The method for making of the transfer printing master mold that uses during as the shape of making optical sheet substrate backside of the present invention can be made by machining is carried out on the surface.Fig. 5 is the sectional view of the manufacturing process of the transfer printing master mold that uses of expression the present invention.Make on one side roller shape base material shown in Figure 57 rotations, diamond segment 6 is moved along the direction of arrow, perhaps, and meanwhile roller is moved along the direction of arrow, Yi Bian form shape by pushing with cutter head.In addition, also can push, perhaps change the position and push with identical cutter head with a plurality of variform cutter heads.By shape, processing spacing, working (finishing) area, the working depth of selecting diamond segment, can be with Shape optimization.
Then, describe for the fine shape that has used the surface to have the roller shape transfer printing master mold making optical sheet substrate backside of fine shape.Fig. 6 is the sectional view of an example that is used to illustrate the manufacturing process of optical sheet of the present invention.As shown in Figure 6, resin bed 14 is coated on to form on the base material 13 is transferred film by supplying with 10, make above-mentioned roller shape transfer printing master mold 11 rotations on one side, on one side with the described film that is transferred of niproll 12 pushings, irradiation is from the ultraviolet light of ultraviolet lamp 9, resin bed is solidified, thus continuously the replicated fine shape, peel off, make thus.
And then, with the method identical, in the positive at least a structure of making in prism structure, lens arrangement, the biconvex lens structure of the base material of the sheet made from the method for making shape overleaf.
The material of transfer printing master mold is metal, pottery, resin etc., and is unqualified, the ferroalloys such as stainless steel of preferred size stability, excellent electric conductivity, and then preferred the use is laminated with the copper with fininsh allowance or the material of nickel.Mechanical lapping, etching, washing etc. are carried out in transfer printing master mold surface, and it is evenly used the back.As the method for surface formation fine shape, can enumerate Laser Processing, sputter, etching, lithography etc.As productivity excellence, the efficient method that obtains the surface configuration of hope, preferably use the first-class method of transfer printing master mold surface being carried out machining of diamond tool.
The roller shape transfer printing master mold that the fine shape of optical sheet substrate backside is to use the surface to have shape obtains its shape transferred thereon to being transferred on the film.Being transferred film is the thing that deformable base material, base material are provided with resin bed.Being provided with the film that is transferred of resin bed with regard to base material, is the operation by pushing transfer printing master mold on resin bed, the operation that resin bed is solidified, thereby its surface configuration is transferred to be transferred on the film to be obtained.In order to improve thermotolerance, solvent resistance, shape stability, also can in the pushing operation, supply with heat, light etc.And then, by adding coupling agent, cementability imparting agent, also can improve adherence with base material.Bonding purpose for improving base material and resin bed also can be coated with the cementability imparting agent on the bonding plane of base material or resin bed.
For resin bed, preferred usability photosensitive resin composition, hot curing resin composition, thermoplastic resin, rubber.By using photoresist, the also essential part of cull layer only, and remove unwanted part.
As the base material that uses among the present invention, can use chemically stable, thermally-stabilised and can be shaped to sheet or tabular material.For example, can use the organic polymer more than from the following substances group, select at least a: tygon, polyolefin such as polypropylene, the polymkeric substance of (methyl) acrylate, ethene and vinyl acetate, ethene and acrylate, the ethylene copolymer that ethene and vinyl alcohol are such, Polyvinylchloride, the multipolymer of vinyl chloride and vinyl acetate, the multipolymer of vinyl chloride and vinyl alcohol, Vingon, polystyrene, styrene and the such styrol copolymer of (methyl) acrylate, polyvinyl toluene, vinyltoluene and the such vinyl toluene copolymer of (methyl) acrylate, poly-(methyl) acrylate, the multipolymer of (methyl) acrylate that (methyl) butyl acrylate and vinyl acetate are such, cellulose acetate, NC Nitroncellulose, cellulose derivatives such as cellophane, polyamide, polycarbonate, polyimide, polyester, synthetic rubber etc.In addition, also have metal species such as aluminium, copper.Wherein, the twin shaft that particularly preferably is excellent in dimensional stability extends polyethylene terephthalate.
As the coating process that uses among the present invention, roll coater coating, spin coater coating, spraying, rotary coating machine coating (whirler coating), the coating of dip coated device, curtain flow coater coating, the coating of line rod spreader, the coating of intaglio plate spreader, the coating of air-blade type spreader etc. are arranged to base material coating resin layer.
Embodiment
Below, with reference to table 1, table 2 embodiment 1～14 is described.The invention is not restricted to these embodiment.
Embodiment 1～14
Make the iron base material rotation of the roller shape of diameter 130mm, wide 470mm on one side,, obtain on iron, being laminated with the roller base material of 200 μ m copper Yi Bian carry out the copper plating.And then, carry out the nickel plating, obtain being laminated with the master mold base material of 200 μ m nickel.It is ground, surface working is become minute surface.Then, make its rotation on one side, one side is that the diamond segment of the curved surface of radius R=40 μ m pushes with some cycles, certain amplitude with front end, obtains roller shape transfer printing master mold, periodically is arranged with the shape of the sphere that is pressed with radius 17.2 μ m, the degree of depth 1.2 μ m on this master mold with certain altitude.Process-cycle is controlled with the roller rotational speed, and working depth is controlled with the cutter head amplitude.The roller shape roller mould that embodiment 1～embodiment 7, embodiment 8～embodiment 14 make corresponding to making the process-cycle difference.
As base material, the film of the prism shape of 90 ° of spacing 46 μ m, high 23 μ m, drift angles is disposed in use on the pet film of thick 50 μ m, be coated with machine at substrate backside coating light-cured resin solution (following 1 and 2) with mould, push described roller shape transfer printing master mold, irradiation ultraviolet radiation, light-cured resin is solidified, separate, obtain having the optical sheet of the upset shape of roller shape transfer printing master mold surface configuration in the surface transfer of light-cured resin layer from roller shape transfer printing master mold.
Light-cured resin solution 1: Hai Taluode (ヒ タ ロ イ De) 7981-F47 (Hitachi Chemical Co., Ltd.'s manufacturing)
Light-cured resin solution 2: the UV curable resin composition that the oligourethane that is obtained by diisocyanate cpd, the methylene glycol that contains hydroxyl and caprolactone modification acrylate constitutes.
Comparative example 1
Upset shape in the described roller shape of not transfer printing of substrate backside transfer printing master mold surface configuration does not form shape at the optical sheet back side, in addition, with embodiment similarly, obtain optical sheet.
The back side shape height of optical sheet of shape of roller shape transfer printing master mold and spacing are arranged and then observe in the substrate backside transfer printing for what make, the results are shown in table 1,2 for the outward appearance of the backlight module that uses this optical sheet to make.For height and spacing, use super degree of depth measuring shape microscope VK-8550 (trade name, Co., Ltd.'s Keyemce (キ one エ Application ス) (Keyence) is made) to measure.In addition, observe for outward appearance, 2 inches of structure shown in Figure 1 with backlight module in, 2 prismatic lenses 5 are replaced to the optical sheet that obtains, can judgement see optical defects such as Moire fringe.By the outward appearance observations optical sheet is carried out comprehensive evaluation, best is expressed as zero, bad being expressed as *.Table 1 is to use the result of light-cured resin solution 1.Table 2 is to use the result of light-cured resin solution 2.
Table 1
Table 2
Among the embodiment 1 shown in the table 1, the spacing of back side shape is 800 μ m.Below, described spacing is 500 μ m in embodiment 2, is 200 μ m among the embodiment 3, is 46 μ m among the embodiment 4, is 30 μ m among the embodiment 5, is 20 μ m among the embodiment 6, is 10 μ m among the embodiment 7.The spacing of their positive prism shapes that forms is aforesaid 46 μ m.Thereby among the embodiment 4, the spacing of front shape and back side shape is 46 μ m, is identical.
In addition, among the embodiment 8 shown in the table 2, the spacing of back side shape is 800 μ m.Below, described spacing is 500 μ m in embodiment 9, is 200 μ m among the embodiment 10, is 46 μ m among the embodiment 11, is 30 μ m among the embodiment 12, is 20 μ m among the embodiment 13, is 10 μ m among the embodiment 14.The spacing of their positive prism shapes that forms is aforesaid 46 μ m.Thereby among the embodiment 11, the spacing of front shape and back side shape is 46 μ m, is identical.
Table 1,2 result are same result, do not have not observe Moire fringe in the comparative example of back side shape.Have among the embodiment 1,2,8,9 of back side shape, produce Moire fringe between the periodicity in base material front and the periodicity of substrate backside, in backlight, be observed.And then the texture of back side shape also is observed in backlight.Among the embodiment 3,10, do not observe the texture of back side shape, but produced and embodiment 1 or 2 identical Moire fringes.The spacing of back side shape is become among the embodiment 4,11 of the 46 μ m identical with the spacing of front shape, the spacing that perhaps makes back side shape is among the following embodiment 6,7,13,14 of 20 μ m, has obtained there is not Moire fringe, has not had the good backlight of outward appearance of texture.So, become the cycle identical by the periodicity that makes the substrate backside shape with the periodicity of base material front shape, the periodicity that perhaps makes the substrate backside shape is below the 20 μ m, obtains the good backlight module that can prevent Moire fringe, optical defect does not take place.
Application on the industry
The present invention is the used optical sheet of the backlight module of liquid crystal indicator, by form metal on the surface Layer can be used as reflector plate and uses. In addition, also can use the optical sheet that obtains as the transfer printing master mold, At this moment, because be the transfer printing of transfer printing, so surface configuration that can the former transfer printing master mold of transfer printing.
Claims (7)
1. optical sheet, it is characterized in that, be formed with at least a structure in prism structure, lens arrangement, the biconvex lens structure in the base material front, form the shape with periodic arrangement at substrate backside, the periodicity of substrate backside shape is the roughly the same cycle with the periodicity in base material front.
2. according to the optical sheet of claim 1 record, wherein, the periodicity of described base material front shape and substrate backside shape is 40～50 μ m.
3. according to the optical sheet of claim 2 record, wherein, the periodicity of described base material front shape and substrate backside shape is 44～48 μ m.
4. an optical sheet is characterized in that, is formed with at least a structure in prism structure, lens arrangement, the biconvex lens structure in the base material front, forms the shape with periodic arrangement at substrate backside, and the periodicity of substrate backside shape is below the 20 μ m.
5. according to the optical sheet of claim 4 record, wherein, the periodicity of described base material front shape is 40～50 μ m.
6. according to the optical sheet of claim 5 record, wherein, the periodicity of described base material front shape is 44～48 μ m.
7. dispose the optical sheet of each record of claim 1～6 and the light source of light conductor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP097326/2007 | 2007-04-03 | ||
| JP2007097326 | 2007-04-03 | ||
| JP203015/2007 | 2007-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101652680A true CN101652680A (en) | 2010-02-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880010444A Pending CN101652680A (en) | 2007-04-03 | 2008-03-05 | Optical sheet and light source using the optical sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101652680A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192473A (en) * | 2010-03-17 | 2011-09-21 | 索尼公司 | Diffusion sheet, backlight, liquid crystal display device, and method for manufacturing diffusion sheet |
| CN102213788A (en) * | 2010-03-26 | 2011-10-12 | 友辉光电股份有限公司 | Optical substrates having light collimating and diffusion structures |
| CN102269840A (en) * | 2010-06-07 | 2011-12-07 | 友辉光电股份有限公司 | Light guide film |
-
2008
- 2008-03-05 CN CN200880010444A patent/CN101652680A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192473A (en) * | 2010-03-17 | 2011-09-21 | 索尼公司 | Diffusion sheet, backlight, liquid crystal display device, and method for manufacturing diffusion sheet |
| CN102213788A (en) * | 2010-03-26 | 2011-10-12 | 友辉光电股份有限公司 | Optical substrates having light collimating and diffusion structures |
| TWI475257B (en) * | 2010-03-26 | 2015-03-01 | Ubright Optronics Corp | Optical substrates having light collimating and diffusion structures |
| CN102213788B (en) * | 2010-03-26 | 2016-03-23 | 友辉光电股份有限公司 | There is the optical substrate of optical alignment and diffusing structure |
| CN105572790A (en) * | 2010-03-26 | 2016-05-11 | 友辉光电股份有限公司 | Optical substrate, uneven structure and method for forming uneven structure on substrate |
| CN102269840A (en) * | 2010-06-07 | 2011-12-07 | 友辉光电股份有限公司 | Light guide film |
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Open date: 20100217 |