CN101922675A - Optical sheet and method for manufacturing the same - Google Patents
Optical sheet and method for manufacturing the same Download PDFInfo
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- CN101922675A CN101922675A CN2009101473463A CN200910147346A CN101922675A CN 101922675 A CN101922675 A CN 101922675A CN 2009101473463 A CN2009101473463 A CN 2009101473463A CN 200910147346 A CN200910147346 A CN 200910147346A CN 101922675 A CN101922675 A CN 101922675A
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- optical sheet
- photosensitive
- photosensitive hardening
- hardening glue
- glue
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- 230000003287 optical effect Effects 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003292 glue Substances 0.000 claims abstract description 70
- 238000003825 pressing Methods 0.000 claims abstract description 17
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- 239000012780 transparent material Substances 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract 2
- 238000000576 coating method Methods 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 8
- 239000004809 Teflon Substances 0.000 claims description 5
- 229920006362 Teflon® Polymers 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims 1
- 229920001155 polypropylene Polymers 0.000 claims 1
- 229920003266 Leaf® Polymers 0.000 description 59
- 238000009792 diffusion process Methods 0.000 description 21
- 238000007493 shaping process Methods 0.000 description 15
- 239000000758 substrate Substances 0.000 description 9
- 208000034189 Sclerosis Diseases 0.000 description 8
- 230000009471 action Effects 0.000 description 8
- 230000004888 barrier function Effects 0.000 description 8
- 238000001125 extrusion Methods 0.000 description 6
- 235000003283 Pachira macrocarpa Nutrition 0.000 description 4
- 241001083492 Trapa Species 0.000 description 4
- 235000014364 Trapa natans Nutrition 0.000 description 4
- 235000009165 saligot Nutrition 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000005026 oriented polypropylene Substances 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The embodiment of the invention discloses an optical sheet and a manufacturing method thereof, belonging to the field of optical sheets. The optical sheet is sheet-shaped and used inside a backlight module, the surface of the optical sheet is provided with a plurality of first microstructures, and the optical sheet is characterized in that: the optical sheet is composed of a hardened photosensitive hardening adhesive. The method comprises the following steps: coating unhardened photosensitive hardening glue on a forming die, wherein the surface of the forming die is provided with a plurality of second microstructures, and the photosensitive hardening glue is coated on the second microstructures; covering a pressing plate on the photosensitive hardening adhesive, wherein the pressing plate is made of a transparent material which is not easy to generate a bridging effect with the photosensitive hardening adhesive; hardening the photosensitive hardening glue to form an optical sheet; and separating the optical sheet from the forming die and the pressing plate. The optical sheet provided by the embodiment of the invention has better performance and lower cost.
Description
Technical field
The invention belongs to the otpical leaf field, particularly a kind of otpical leaf that is installed in backlight module inside.
Background technology
In recent years, traditional cathode-ray tube (CRT, Cathode Ray Tube) display is replaced by LCD gradually, and main cause is that the amount of radiation that LCD discharges is far smaller than CRT monitor, and LCD also reduces significantly in this manufacturing cost in several years.In general, LCD comprises backlight module and liquid crystal panel two large divisions, and the main function of backlight module is to provide the light source liquid crystal display to use.
Referring to Figure 1A, Figure 1A is depicted as backlight module of the prior art.This backlight module 100 comprises cathode fluorescent tube (CCFL, Cold Cathode Fluorescent Lamp) 110, reflector 120, diffuser plate 130, diffusion barrier 142 and brightness enhancement film (BEF, Brightness Enhancement Film) 144, CCFL110 is in order to producing light source, reflector 120 then be in order to ray guidance that spaced CCFL110 produced to direction towards diffuser plate 130.The function of diffuser plate 130 mainly is that the light that CCFL110 sends is spread, and makes the light that exposes to liquid crystal panel (not indicating in the drawings) more even, and can not produce the phenomenon of brightness irregularities on the display surface of LCD.In addition, because diffuser plate 130 has a plurality of smooth diffusion particles, so can cause the penetrance of diffuser plate 130 to reduce.In general, the penetrance of diffuser plate 130 is 50%-70%.
At present, diffuser plate 130 is mainly made by the mode of ejection formation.Yet along with frivolous trend becomes prevailing custom, the thickness of diffuser plate 130 is also more and more thin.Yet when diffuser plate 130 is more and more thin, its various technological parameters (as: die temperature) will be difficult to control, and this will cause the ratio of briquetting of diffuser plate 130 to reduce.In addition, the main material of diffuser plate 130 is that (PMMA, PolymethylMethacrylate), this material absorbs water polymethyl methacrylate easily, thereby causes diffuser plate 130 easy buckling deformations.
Referring to Figure 1B, Figure 1B is depicted as the front view of brightness enhancement film among Figure 1A.Brightness enhancement film 144 mainly is made of a substrate 144a and a structure sheaf 144b.Wherein, the thickness of substrate 144a is about 175 μ m, and its material is transparent PET (PET, polyethylene terephthalate), and the thickness of structure sheaf 144b is about 25 μ m, and its material then is photosensitive hardening glue (photosensitive resin).
Yet being provided with of substrate 144a can make material cost increase.And, when light I1 after the plane of incidence 144c incident of brightness enhancement film 144, needing could can increase the loss of light from the exit facet 144d ejaculation of brightness enhancement film 144 like this through two layer mediums (being substrate 144a and structure sheaf 144b).In addition, because substrate 144a is made of different materials respectively with structure sheaf 144b, refractive index is also different mutually, so light I 1 needs could to penetrate from the exit facet 144d of brightness enhancement film 144 through three refractions at least, further increases the loss of light.And the designer of brightness enhancement film 144 also need consider more variable when design, and the degree of difficulty in the design is increased.
Therefore, how improving the ratio of briquetting of diffuser plate 130, the material cost that reduces brightness enhancement film 144 and minimizing designer degree of difficulty in design, is to be worth this area to have the problem of knowing that usually the knowledgeable considers.
Summary of the invention
The purpose of this invention is to provide a kind of otpical leaf, this otpical leaf can reduce material cost, reduce loss and designer's degree of difficulty in design of light.
According to above-mentioned purpose and other purpose, the invention provides a kind of otpical leaf, this otpical leaf uses in the inside of backlight module, has a plurality of first micro-structurals on the surface of this otpical leaf, and this otpical leaf is characterised in that: this otpical leaf mainly is made of hardened photosensitive hardening adhesive.Wherein, photosensitive hardening glue is UV cured glue.
According to above-mentioned purpose and other purpose, the invention provides a kind of manufacture method of otpical leaf, it comprises following step: at first, one unhardened photosensitive hardening glue is coated on a molding, have a plurality of second micro-structurals on the surface of this shaping mould, and this photosensitive hardening glue is coated on these second micro-structurals; One pressing plate is covered on the photosensitive hardening glue, and this pressing plate is made of the transparent material that is difficult for photosensitive hardening glue generation bridging action; Then, with the sclerosis of photosensitive hardening glue, form an otpical leaf; At last, otpical leaf and shaping mould and pressing plate are broken away from mutually.Wherein, photosensitive hardening glue is UV cured glue.
According to above-mentioned purpose and other purpose, the invention provides the manufacture method of another kind of otpical leaf, it comprises following step; At first, a unhardened photosensitive hardening glue is coated on the transparent transport tape, transport tape is to be made of the transparent material that is difficult for photosensitive hardening glue generation bridging action; Above transport tape, be provided with a roller, and have imprinted pattern on the surface of this roller, below transport tape, be provided with at least one light source; On photosensitive hardening glue, can make above-mentioned imprinted pattern transfer printing on photosensitive hardening glue the roller roll extrusion, on photosensitive hardening glue, form a plurality of first micro-structurals; Then, the light that light source is sent is radiated on above-mentioned first micro-structural, can make the sclerosis of first micro-structural; Hardened photosensitive hardening adhesive and transport tape are separated; At last, hardened photosensitive hardening adhesive is divided into a plurality of otpical leafs.
According to above-mentioned purpose and other purpose, the invention provides a kind of manufacturing equipment of otpical leaf, this manufacturing equipment comprises a container, a transport tape, a roller, a light source and a product accommodation device.Wherein, container has a valve, and the photosensitive hardening glue that is aqueous is housed in this container.Transport tape is to be discharged by a transport tape unlocking wheel, and takes in wheel by a transport tape and take in.Transport tape is made of the transparent material that is difficult for producing bridging action with photosensitive hardening glue and the below of the valve of passing through, and the photosensitive hardening glue in the said vesse is deposited on the transport tape through valve.And transport tape is made of the transparent material that is difficult for photosensitive hardening glue generation bridging action.Have imprinted pattern on the roller, roller is positioned at the top of transport tape and the photosensitive hardening glue that is deposited on the transport tape is carried out roll extrusion.First light source is arranged on the below of transport tape, the photosensitive hardening glue after the roll extrusion is shone, so that the sclerosis of photosensitive hardening glue.In addition, the product accommodation device is taken in hardened photosensitive hardening adhesive.
Because otpical leaf of the present invention is not provided with substrate, therefore can reduce material cost and thickness.In addition, light only need just can penetrate from the exit facet of otpical leaf through one deck medium after the plane of incidence incident of otpical leaf, can reduce the parameter of designer's required consideration when the design otpical leaf like this, thereby reduces the degree of difficulty in the design.And, because light only need pass through one deck medium, so otpical leaf is lower to the loss of light.Therefore, otpical leaf of the present invention has preferable performance and lower cost.
Description of drawings
Figure 1A is depicted as the backlight module of prior art.
Figure 1B is depicted as the front view of the brightness enhancement film of Figure 1A.
Fig. 2 A to Fig. 2 E is depicted as the otpical leaf manufacturing flow chart of the embodiment of the invention.
Being used to of Figure 3 shows that the embodiment of the invention provides made the shaping mould of the otpical leaf of tool light diffusion function.
Figure 4 shows that the otpical leaf of another embodiment of the present invention.
Figure 5 shows that the otpical leaf of an embodiment more of the present invention.
Figure 6 shows that the manufacturing equipment of otpical leaf.
Figure 7 shows that the another kind of manufacturing equipment of otpical leaf.
In the accompanying drawing, the list of parts of each label representative is as follows:
100 backlight modules, 110 cathode fluorescent tubes, 120 reflectors, 130 diffuser plates, 142 diffusion barriers, 144 brightness enhancement film, 144a substrate, 144b structure sheaf, the 144c plane of incidence, 144d exit facet
20 photosensitive hardening glue
30,30 ' shaping mould, 31 surfaces, 32,32 ' second micro-structural
40 pressing plates
50 light sources
60,60 ', 60 " otpical leaf, 61,61 ', 61 " first micro-structural, 62 planes of incidence, 63 exit facets, I2 light, 64 " the light diffusion particle
71 containers, 72 transport tape unlocking wheels, 73 rollers, 74 transport tapes are taken in wheel, and 75 products are taken in wheel, 75 ' placement platform, 751 ' placement surface, 76a first light source, 76b secondary light source, 76c the 3rd light source, 77 transport tapes, 78 auxiliary wheels, 79 valves
The specific embodiment
For the purpose, technical solutions and advantages of the present invention more can be become apparent, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Referring to Fig. 2 A to Fig. 2 E, Fig. 2 A to Fig. 2 E is depicted as the otpical leaf manufacturing flow chart of the embodiment of the invention.At first, referring to Fig. 2 A, be a molding 30 that the embodiment of the invention provides, have a plurality of second micro-structural, 32, the second micro-structurals 32 on the surface 31 of shaping mould 30 for to be the specular groove of water chestnut, the material of shaping mould 30 is a metal, for example: nickel.And, on the surface 31 of shaping mould 30, also be coated with Teflon (Teflon).Referring to Fig. 2 B, be the photosensitive hardening glue 20 that aqueous and viscosity surpasses 50cps with one and be coated on the surface 31 of shaping mould 30.Photosensitive hardening glue is meant: when being subjected to the light irradiation of certain wavelength band, it can produce sclerosis.In the present embodiment, photosensitive hardening glue 20 is UV cured glue, can produce sclerosis when promptly photosensitive hardening glue 20 is subjected to the ultraviolet ray irradiation.
Referring to Fig. 2 C, a pressing plate 40 is covered on the photosensitive hardening glue 20.Pressing plate 40 is made of transparent material, and for example glass, oriented polypropylene (oriented polypropylene) or other are difficult for producing the transparent materials that build bridge (cross-link) acts on 20 in photosensitive hardening glue.
Then, referring to Fig. 2 D, use 50 pairs of photosensitive hardening glue 20 of a light source to shine.Because pressing plate 40 is made of transparent material, so the light that sends of light source 50 can see through pressing plate 40 and be radiated on the photosensitive hardening glue 20, makes 20 sclerosis of photosensitive hardening glue.In the present embodiment, light source 50 is a ultraviolet lamp.
Because pressing plate 40 is to be made of difficult and 20 materials that produce bridging action of photosensitive hardening glue, so photosensitive hardening glue 20 just can be taken away pressing plate 40 after sclerosis easily.And, owing to be coated with Teflon on the shaping mould 30,, photosensitive hardening glue 20 do not build bridge so can not producing with Teflon, after 20 sclerosis of photosensitive hardening glue, photosensitive hardening glue 20 can be taken off from shaping mould 30.Shown in Fig. 2 E, just the photosensitive hardening glue 20 after the moulding becomes an otpical leaf 60 with a plurality of first micro-structurals 61.
Compared to the brightness enhancement film 144 of Figure 1B,, therefore can reduce material cost and thickness because otpical leaf 60 is not provided with substrate.In the present embodiment, the thickness of otpical leaf 60 is about 50 μ m.At this, the thickness of otpical leaf 60 is meant from the distance on the plane of incidence 62 to first micro-structurals 61 tops of otpical leaf 60.In addition, compared to brightness enhancement film 144, light I2 only need just can penetrate from the exit facet 63 of otpical leaf 60 through one deck medium after the plane of incidence 62 incidents of otpical leaf 60, can reduce the parameter of designer's required consideration when design otpical leaf 60 like this, thereby reduce the degree of difficulty in the design.And, because light only need pass through one deck medium, so the loss of 60 pairs of light of otpical leaf is lower.Therefore, otpical leaf 60 has preferable performance and lower cost compared to the brightness enhancement film 144 of prior art.
Technical process by shown in Fig. 2 A to Fig. 2 E except can producing the otpical leaf 60 with light-focusing function, also can design the otpical leaf of providing light diffusion function, in order to replace the diffusion barrier 142 among Figure 1A.Referring to Fig. 3, Figure 3 shows that the shaping mould that is used to make otpical leaf with light diffusion function.This shaping mould 30 ' is with the maximum differential of the shaping mould 30 of Fig. 2 A: second micro-structural 32 ' on the shaping mould 30 ' is hemispheric groove shape.By unhardened photosensitive hardening glue 20 (shown in Fig. 2 B) is coated on the shaping mould 30 ', and through after the flow process shown in Fig. 2 C and Fig. 2 D, can produce otpical leaf 60 ' as shown in Figure 4, the thickness of otpical leaf 60 ' is approximately between between the 0.1mm to 0.2mm.Because first micro-structural 61 ' on the otpical leaf 60 ' is hemispherical, have the effect of diffusion light, therefore can replace the diffusion barrier 142 (shown in Figure 1A) in the backlight module 100.And, because diffusion barrier 142 still need be provided with substrate 144a, so otpical leaf 60 ' has thin thickness and lower material cost.In Fig. 4, first micro-structural 61 ' is to wait layout to arrange each other, but this area has and knows that usually the knowledgeable also can make first micro-structural 61 ' random number and arrange.
Above-mentioned first micro-structural 61 and first micro-structural 61 ' are the shape of outside protrusion, but this area has and know that usually the knowledgeable also can be according to the required character that reaches of otpical leaf, first microstructure design are become other shape, for example: the groove that caves inward.
In addition, also can in unhardened photosensitive hardening glue 20, add the light diffusion particle, simultaneously with its thickness thickening, just can form otpical leaf 60 as shown in Figure 5 "; otpical leaf 60 " except its first micro-structural 61 " be the semi-spherical shape; its inside also has a plurality of smooth diffusion particles 64 ", these light diffusion particles 64 ' can increase the effect of light diffusion further.Because otpical leaf 60 " have bigger thickness (approximately between between the 0.5mm to 1.6mm), and have the effect of light diffusion, therefore can replace the diffuser plate 130 (shown in Figure 1A) in the backlight module 100.Certainly, this area has knows that usually the knowledgeable also can select not to be provided with first micro-structural 61 ", and make otpical leaf 60 " exiting surface present smooth surface.
The manufacture method of the otpical leaf of being introduced except Fig. 2 A to Fig. 2 E, below introduce the otpical leaf manufacturing process of another embodiment of the present invention.Referring to Fig. 6, be the manufacturing equipment of otpical leaf shown in Fig. 6, this manufacturing equipment comprises: a container 71, a transport tape unlocking wheel 72, a roller 73, a transport tape are taken in wheel 74, one product and are taken in wheel 75,1 first light source 76a, a secondary light source 76b, one the 3rd light source 76c, a transport tape 77, an auxiliary wheel 78 and a valve 79.Wherein, be equipped with in the container 71 and be the photosensitive hardening glue 20 that aqueous and viscosity surpasses 50cps, and the discharge of valve 79 control photosensitive hardening glue 20,, can control photosensitive hardening glue 20 and be deposited on thickness on the transport tape 77 by the control discharge.Transport tape 77 is to discharge from transport tape unlocking wheel 72, and takes in wheel 74 by transport tape and take in.Transport tape 77 is to be made of difficult and 20 transparent materials that produce bridging action of photosensitive hardening glue, for example: oriented polypropylene.
In the present embodiment, one first light source 76a, a secondary light source 76b and one the 3rd light source 76c are ultraviolet lamp.Wherein, secondary light source 76b is used for photosensitive hardening glue 20 is done tentatively to harden.Photosensitive hardening glue 20 can be subjected to the roll extrusion of roller 73 through after tentatively hardening, and has imprinted pattern (indicating) on the surperficial 73a of roller 73.After photosensitive hardening glue 20 was crossed in roller 73 roll extrusion, imprinted pattern can be transferred on the photosensitive hardening glue 20, to form a plurality of first micro-structurals 61.And roller 73 is to be made of the transparent material that is difficult for producing bridging action with photosensitive hardening glue 20, and photosensitive hardening glue 20 can be attached on the roller 73.In the present embodiment, first micro-structural 61 is for to be the specular projection of water chestnut, so imprinted pattern should be made up of a plurality of specular grooves of water chestnut that are.
When 73 pairs of photosensitive hardening glue of roller 20 carried out roll extrusion, the first light source 76a and the 3rd light source 76c all shone photosensitive hardening glue 20, and photosensitive hardening glue 20 is further hardened.
In the present embodiment, light source has 3, but this area has and knows that usually the knowledgeable also can adjust the quantity of light source according to situation, for example only is provided with a light source, or 2 light sources are set, or the light source more than 3 is set.
Because transport tape 77 is to constitute with 20 transparent materials that produce bridging action of photosensitive hardening glue by being difficult for, so hardened photosensitive hardening adhesive 20 can separate with transport tape 77, takes in and takes turns on 75 and make photosensitive hardening glue 20 be wound on product.Then, can take in the photosensitive hardening glue 20 of wheel on 75 and take off being wound on product, and it is cut, to form the otpical leaf 60 shown in 2E.
In addition, referring to Fig. 7, Figure 7 shows that the another kind of manufacturing equipment of otpical leaf.The maximum difference of this manufacturing equipment and manufacturing equipment shown in Figure 6 is: hardened photosensitive hardening adhesive 20 is not to be incorporated in product to take on the wheel 75, but be sent on the placement platform 75 ' with smooth placement surface 751 ', (for example: cutting) to carry out follow-up technology.
This area has knows the knowledgeable usually as long as Fig. 6 or process apparatus and parameter shown in Figure 7 are adjusted, and can make the optical sheet of other kind.For example, if change the imprinted pattern on the roller 73 into hemispheric groove, just can produce otpical leaf 60 ' as shown in Figure 4.Perhaps, adjust valve 79,, just can make the enlarged in thickness of the photosensitive hardening glue 20 that is deposited on the transport tape 77 the discharge increasing of photosensitive hardening glue 20, in unhardened photosensitive hardening glue 20, add the light diffusion particle simultaneously, just can produce otpical leaf 60 as shown in Figure 5 ".
The above is the preferred embodiment of the present invention only, is not so limits claim of the present invention.Any modification that every utilization specification of the present invention and accompanying drawing content are done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101473463A CN101922675A (en) | 2009-06-15 | 2009-06-15 | Optical sheet and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101473463A CN101922675A (en) | 2009-06-15 | 2009-06-15 | Optical sheet and method for manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101922675A true CN101922675A (en) | 2010-12-22 |
Family
ID=43337770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101473463A Pending CN101922675A (en) | 2009-06-15 | 2009-06-15 | Optical sheet and method for manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101922675A (en) |
-
2009
- 2009-06-15 CN CN2009101473463A patent/CN101922675A/en active Pending
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Open date: 20101222 |