CN1916726A - Optical element in use for liquid crystal display, and prepartion method - Google Patents
Optical element in use for liquid crystal display, and prepartion method Download PDFInfo
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- CN1916726A CN1916726A CN 200510091742 CN200510091742A CN1916726A CN 1916726 A CN1916726 A CN 1916726A CN 200510091742 CN200510091742 CN 200510091742 CN 200510091742 A CN200510091742 A CN 200510091742A CN 1916726 A CN1916726 A CN 1916726A
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Abstract
An optical element used on liquid crystal display consists of a phase delay layer being formed by a cross-linked liquid crystal material and being set with multiple parallel groove at one surface of it as well as a cholesterol liquid crystal layer being integrated with said phase delay layer. The method for preparing said optical element is also disclosed.
Description
Technical field
The present invention relates to optical element that is used for LCD and preparation method thereof, refers to the phase delay layer of the little groove structure of a kind of associative list mask and the optical element of a cholesteric liquid crystal layer especially.
Background technology
Flourishing day by day along with the flat-panel screens technology, wherein attract most attention no more than the LCD correlation technique, because liquid crystal itself is not luminous, its function is as light valve whether passing through with control light, therefore the total brightness that sees through LCD and reach human eye only be that its back light provided 4～6%, therefore how to improve the light service efficiency, the consumption of lowering the energy just becomes an important problem.
In LCD, cause light utilization rate main cause on the low side to be that LCD needs by reached the state exchange of " bright " and " secretly " by polarizing field, further reach full-color demonstration, commercially available its principle of polaroid is to utilize high-molecular organic material at present, for example polyvinyl alcohol (PVA) (PVA) or derivatives thereof makes its absorption iodine and makes uniaxial tension, produce directivity by this, so the dichromatism polaroid lowers light intensity over half with incident light earlier.Therefore if incident light can be converted to earlier can penetrate polaroid fully linearly polarized light again row pass polaroid, the usefulness of incident light significantly can be improved, reach and save the energy and the purpose that improves brightness.In addition, universalness along with LCD TV, the demand of high brightness promotes thereupon, if only increase back light in response to being not good plan according to classic method, except that energy consumption will improve, more derive high temperature and face the challenge of heat dissipation problem, and high temperature can cause the deterioration of material, and then influence the life-span of display.
Therefore, under the mechanism that does not change the LCD colour generation, adopting reflecting polarized wafer to reach the technology that increases brightness effects is subjected to gazing at greatly, this reflecting polarized wafer is a kind of mechanism of smooth recycling in fact, can be divided into the retro-reflection formula polaroid of handling linearly polarized light and the cholesterol liquid crystal reflecting polarized wafer two big classes of handling circularly polarized light at present.The former is difficult for comparatively loaded down with trivial details processing procedure and volume production; The latter is relative, and processing procedure is simple and easy, as long as cooperate suitable liquid crystal to control technology, volume production is relatively easy, thereby is subjected to great attention.The principle of cholesterol liquid crystal reflecting polarized wafer is to utilize the circularly polarized light stalling characteristic of cholesterol liquid crystal, because cholesterol liquid crystal is the nematic liquid crystal that revolves optical activity for a kind of tool.Its molecule can be made helical structure with optical axis and arrange, so the not polarization white light of incident can be separated into left circularly polarized light and right-circularly polarized light, wherein the circularly polarized light of opposite optical activity is penetrable, identical circularly polarized light then is reflected, cooperate this moment the use of a reflecting surface circularly polarized light that is originally reflected by cholesterol liquid crystal can be inverted to transparent circularly polarized light and to pass through cholesterol liquid crystal again, form two times of single circularly polarized lights that revolve optical activity, if be used one 1/4 wavelength retardation plates again, circularly polarized light can be changed into linearly polarized light, finally make incident light convert to fully and can reach the effect that increases brightness totally by the polarization state of polaroid.
1/4 commercially available wavelength retardation plate mostly is the extruding of macromolecule power or makes film earlier with Rong Ji Rong casting at present; again drawn, fit some diaphragms and form 1/4 wavelength phase retardation film; so before assembling, need remove outer protective film earlier; re-using optical cement fits; therefore integral thickness is thick; material and processing procedure cost be difficult for to descend, and particularly layer and the interface of interlayer more can cause the decline of penetrability, to negative influence is arranged on the liquid crystal display applications.In addition, this type of 1/4 wavelength phase retardation film is to utilize the macromolecule extensibility can produce phase differential or phase delay effect, need adopt high polarity high boiling solvent when the coating macromolecule, and is higher and more difficult on operating temperature.
Recent new technology is to produce the phase delay effect with coating birefraction liquid crystal, its general method for making is to be coated with one deck both alignment layers on base material earlier, again with the crosslinkable liquid crystals solution coat to base material, but both alignment layers also use expenditure as cost, and when making, need use scraping mechanism can produce the orientation effect, be easy to generate defective in the process.
Because prior art need be used other layer of alignment film ability orientation liquid crystal, so need with optical cement in conjunction with other layer of two kinds of elements ability of phase retardation film and alignment film orientation liquid crystal reaching the effect of the total conversion penetrating of polarisation, and two elements is easily supervened in conjunction with interface on cost, the processing procedure such as bubble and is lacked in the process.
Summary of the invention
The purpose of this invention is to provide a kind of optical element that need not use alignment film, its circularly polarized light that difference can be revolved optical activity convert to convert to again behind the unidirectional double circularly polarized light can be totally linearly polarized light by polaroid, reach and reduce thickness, cost, fabrication steps, and needn't improve the brightness that back light can improve LCD.
Another object of the present invention provides a kind of method for making of optical element, it is to utilize stamped method to make the optical phase put-off layer of tool surface groove structures, and cholesteric liquid crystal layer is formed on the aforementioned optics phase delay layer makes optical element of the present invention, effectively solve prior art and must see through the disappearance that stretches and could produce the phase delay effect or just can reach easy generation defective such as orientation mechanism mechanism via scraping mechanism.
In order to achieve the above object, the present invention provides a kind of optical element, and it is to comprise: a phase delay layer, and it is made of a crosslinked liquid crystal material, and a surface of this phase delay layer has a plurality of grooves side by side; And a cholesteric liquid crystal layer, it is to combine with aforementioned phase delay layer.
Optical element provided by the invention, its phase delay layer and cholesterol liquid crystal interlayer need not use the sticker combination; In addition, optical element of the present invention is the trench structure orientation cholesterol liquid crystal that utilizes the phase delay laminar surface, the use of both alignment layers that need not be extra.
The present invention also provides a kind of method for making of optical element, and its step comprises: a crosslinked liquid crystal solution, a base material and an impressing mould (a) are provided, and this impressing mould is to have a plurality of trench structures side by side; (b) with aforementioned crosslinked liquid crystal soln using aforementioned impression die marks on aforementioned substrates; (c) aforementioned crosslinked liquid crystal is solidify to form a phase delay layer, a surface of this phase delay layer has a plurality of grooves side by side; Reach and (d) on aforementioned phase delay layer, form a cholesteric liquid crystal layer.
The present invention utilizes stamped method to make phase retardation film, be different from prior art and utilize pulling method processing procedure phase retardation film, an aspect of stamped method be with crosslinked liquid crystal solution coat behind substrate surface, utilize impressing mould to impress this surface again in base material; Another aspect be with crosslinked liquid crystal solution coat in the impressing mould surface, again this impressing mould is impressed in substrate surface; The impressing mould applied pressure is less than every square centimeter 50 kilogram weight.
Preferably, an aspect of the curing of abovementioned steps (c) is can utilize less than 200 ℃ temperature to heat-treat, and another aspect is that can to utilize optical wavelength range be rayed between 200nm to 600nm.
Liquid crystal molecule is subjected to the restriction of mould and base material and produces uniaxiality in the optical element manufacturing process of the present invention, and its groove structure has the characteristic of other layer of orientation liquid crystal molecule (cholesterol liquid crystal), if the use of collocation one reflecting surface can make the incident light of desiring to penetrate optical element of the present invention, two circularly polarized lights that its difference is revolved optical activity can be transformed into two times of single circularly polarized lights that revolve optical activity, further convert linearly polarized light again to, reach can be totally polarization state by polaroid.
Therefore, LCD with optical element of the present invention, the light that its back light sent can hang down when penetrating this optical element and convert the purpose that linearly polarized light reaches raising brightness damply to, when being applied to computer screen or LCD TV, the high temperature of following in the time of can avoiding increasing back light with raising brightness causes material degradation, influences the life-span of LCD.
Description of drawings
Fig. 1 is optical element synoptic diagram of the present invention;
Fig. 2 is the process flow diagram for the forward stamped method of optical element method for making of the present invention;
Fig. 3 is the process flow diagram for the reverse stamped method of optical element method for making of the present invention;
Fig. 4 is the atomic force electron microscope measurement figure for optical element of the present invention;
Fig. 5 is that to close for the penetrance of its left rotatory polarization of optical element of the present invention and right rotatory polarization be figure;
Fig. 6 is the Guan Shitu of the anglec of rotation and the penetrance of optical element of the present invention (the phase delay layer value is 126nm).
[the main element symbol is to as directed]
1 phase delay layer
1 ' crosslinked liquid crystal solution
2 cholesteric liquid crystal layers
3 grooves
4 base materials
5 moulds
10 optical elements of the present invention
Embodiment
Optical element 10 of the present invention is as shown in Figure 1, is to be formed by a phase delay layer 1 and a cholesteric liquid crystal layer 2 combinations, and wherein phase delay layer 1 is made of crosslinked liquid crystal material.The surface of aforementioned phase delay layer 1 has a plurality of grooves side by side 3, and wherein to add the paddy wide region be to be 0.1 micron to 5 microns to the live width of groove 3, and the wide ratio range of live width/paddy is to be 0.2 to 5, and the gash depth scope is to be 0.1 micron to 2 microns.The crosslinked liquid crystal material that the present invention uses is to be micromolecule, oligomerization zoarium or macromolecule etc., existing comprise nematic liquid crystal, to palm property nematic liquid crystal, stratose liquid crystal or dish-like liquid crystal, be the RMS03-001 of for example Merck, the SLM90519 of Wacker etc. with the commercial goods.
The cholesteric liquid crystal layer 2 of optical element 10 of the present invention is to combine with aforementioned phase delay layer 1, and it is to coat on the surface of a plurality of grooves side by side 3 of having of aforementioned phase retardation film 1, and 2 of phase delay layer 1 and cholesteric liquid crystal layers do not have sticker; Cholesterol liquid crystal used in the present invention is the pitch that can have continuous or discrete increasing or decreasing, all be divided into left light and right-hand circularly polarized light by this incident light with all visible wavelengths, cholesterol liquid crystal of the present invention also can have specific pitch, reaches the brightening effect of specific wavelength by this.
The method for making of optical element of the present invention, details are as follows for its step: a crosslinked liquid crystal solution, a base material and an impressing mould at first are provided, wherein crosslinked its composition of liquid crystal solution is to comprise: the crosslinked liquid crystal material of the initiator of 0.1% to 5% percentage by weight, 5% to 50% percentage by weight, and the solvent of 50-95% percentage by weight.Crosslinked liquid crystal material is kind as the aforementioned, initiator is Irgacure 369 , Irgacure 907 as commercially available Ciba Geigy, the solvent that is suitable for comprises, but be not limited to toluene, ethyl acetate, N-N-methyl-2-2-pyrrolidone N-(NMP), tetrahydrofuran (THF), ring phosphorus vinegar amine (cyclophosphamide, CP) and 1-Methoxy-2-propyl acetate (Propyleneglycolmonomethylether acetate, PGMEA); The material of impressing mould comprises, but is not limited to Silicon Wafer, quartz or metal etc.One surface of this impressing mould is to have a plurality of trench structures side by side, and the cycle of groove (it is wide that live width adds paddy) scope is that the degree of depth of groove is to be 0.1 micron to 2 microns for 0.1 micron to 5 microns, the wide ratio of live width/paddy of groove are to be 0.2 to 5.
Follow aforementioned crosslinked liquid crystal soln using aforementioned impression die marks on aforementioned substrates, its be can utilize as shown in Figure 2 the forward stamped method or reverse stamped method shown in Figure 3 reach, if use the forward stamped method, the crosslinked liquid crystal solution 1 ' that at first needs to prepare utilizes plsitive mold, method of spin coating or scraper rubbing method are coated base material 4 surfaces, the mould 5 that will have pattern then is placed on the base material 4 of the crosslinked liquid crystal solution 1 ' of coating, middle by make crosslinked liquid crystal solution 1 ' evenly be full of mould 5 by pressure and temperature controlling with base material 4, cooperate heat or rayed (being generally ultraviolet light) that it is solidified again, mould 5 is peeled off to make the phase delay layer 1 of a plurality of groove 3 structures of surperficial tool of the present invention.
Right if use reverse stamped method, then be that the crosslinked liquid crystal solution 1 ' that will prepare utilizes plsitive mold, method of spin coating or scraper rubbing method to coat the mould 5 with pattern, then this mould 5 is placed on the base material 4, by crosslinked liquid crystal solution 1 ' evenly is full of in the middle of mould 5 and the base material, cooperate heat or rayed (being generally ultraviolet light) that it is solidified again, mould 5 is peeled off to make the phase delay layer 1 of a plurality of groove 3 structures of surperficial tool of the present invention.
The impressing mould applied pressure is according to the different and difference to some extent of liquid crystal property, generally between 0～100kg/cm
2, be preferably less than 50kg/cm
2, better can be less than 25kg/cm
2Curing schedule is difference according to the difference of liquid crystal property and to some extent equally, generally is to utilize to heat-treat less than 200 ℃ temperature get final product, if the employing light illuminating method then can utilize optical wavelength range to carry out treatment with irradiation between the light of 200nm to 600nm.
Mould can further make one from the shape layer prior to die surface with before crosslinked liquid crystal solution contacts in abovementioned steps, and the method for making is to know this operator by this field to be known, and for example starches assist type chemical vapour deposition technique (PECVD) with C with electricity
4F
8Be formed on the mould, as " Master replication into thermosetting polymers fornanoimprinting. " (J.Vac.Sci.Technol.B 18 (6), Nov/Dec 2000pp3582), perhaps be formed on the mould with soaking the material that the method for putting will contain long carbochain or fluorine-containing functional group, as " Thermocurable polymers as resists for imprintlithography " as described in (Elec.Lett.Vol.36No.11May 2000pp983), cause the hydrophobic effect of mould, be easy to make mould and base material to break away from.
After mould and base material disengaging, substrate surface promptly has the phase delay layer that a surface has trench structure, with cholesterol liquid crystal coating thereon, base material is peeled off can be finished optical element of the present invention (as shown in Figure 1) at last afterwards.Cholesterol liquid crystal used in the present invention is the pitch that can have continuous or discrete increasing or decreasing, all be divided into left light and right-hand circularly polarized light by this incident light with all visible wavelengths, cholesterol liquid crystal of the present invention also can have specific pitch, reaches the brightening effect of specific wavelength by this.
Following examples are to be used for further understanding advantage of the present invention, are not to be used to limit claim of the present invention.
Get available from the fit SLM90519 of the side-chain liquid crystal oligomerization of Wacker, collocation initiator Irgacure 369 and solvent toluene, be mixed with 10%, 20% and 30% solution, utilize method of spin coating under the 2000rpm rotating speed, to coat on the mould, oppositely impress again on base material (being reverse stamped method), exert pressure and be 1.5 kilograms every square centimeter, operating temperature is 120 ℃, carry out the sample that crosslinked back obtains curing with UV-irradiation more afterwards, measure the phase-delay value of each ratio again, the gained result is shown in following table one:
Table one, the phase-delay value of variable concentrations liquid crystal under the 2000rpm coating speed
| Concentration | 10％ | 20％ | 30％ |
| Phase-delay value | 80nm | 126nm | 162nm |
As shown in Table 1, the present invention utilizes stamped method to make the phase retardation film with surface groove structures, can reach the effect of phase delay really, and can reach required phase-delay value by the concentration by the control liquid crystal molecule.
Embodiment 2. coating speeds are to the influence of phase-delay value
Get available from the fit SLM90519 of the side-chain liquid crystal oligomerization of Wacker, collocation initiator Irgacure 369 and solvent toluene, be mixed with 10%, 20% and 30% solution, utilize method of spin coating under the 3000rpm rotating speed, to coat on the base material, delivery tool forward impresses on substrate surface (being the forward stamped method) again, exert pressure and be 1.5 kilograms every square centimeter, operating temperature is 120 ℃, carry out the sample that crosslinked back obtains curing with UV-irradiation more afterwards, measure the phase-delay value of each ratio again, the gained result is shown in following table two:
Table two, the phase-delay value of variable concentrations liquid crystal under the 3000rpm coating speed
| Concentration | 10％ | 20％ | 30％ |
| Phase-delay value | 91nm | 156nm | 220nm |
As shown in Table 2, the present invention utilizes the concentration of control liquid crystal molecule can reach outside the required phase-delay value, between learning more also that with embodiment 1 be coated with rotating speed different also are the means of control phase length of delay.
Get available from the fit SLM90519 of the side-chain liquid crystal oligomerization of Wacker, collocation initiator Irgacure 369 and solvent toluene, be mixed with 30% solution, utilize method of spin coating under the 3000rpm rotating speed, to coat on the mould, oppositely impress again on base material (being reverse stamped method), exert pressure and be 0.05 kilogram every square centimeter, operating temperature is 150 ℃, carry out the sample that crosslinked back obtains curing with UV-irradiation more afterwards, measure phase-delay value again, its atomic force electron microscope of the phase retardation film of the tool surface groove structures of gained measures figure as shown in Figure 4, and the cycle is 1.8 μ m, the degree of depth is 200nm, and the phase-delay value of gained is to be 160nm after measuring.
Get that phase-delay value is the phase retardation film of 126nm in the previous embodiment, this film Surface Groove degree of depth is to be 200nm as described above, cycle is 1.8 μ m, then be taken at the cholesteric liquid crystal solution that blue region has brightening effect (it is to mix with 7: 3 ratios with SLM 90034 from the SLM 90032 of Wacker buying) and coat this phase retardation film surface, promptly can be made into optical element of the present invention, measure its ultraviolet light-visible light penetration effect afterwards.
After measuring, find, optical element of the present invention has spectrophotometric result to linear polarisation, as shown in Figure 5, the left-handed rotation of different wave length and right-handed rotation, it penetrates effect and inequality, along with the increase of wavelength, the effect that penetrates of the light of specific optical activity changes, and its corresponding light that revolves optical activity does not then have notable difference.
Fig. 6 measures the light that wavelength is 460nm separately, the correlativity of its penetration and angle when rotating polaroid.By knowing, optical element of the present invention has preferable penetration after converting light to the line polarisation when the polarization direction is parallel to polaroid by figure, and the light penetration degree are minimum after polaroid rotates 90 degree.
Comprehensively above-mentioned, optical element of the present invention can utilize the difference of crosslinked liquid crystal solution concentration difference, coating speed difference and pressure and temp to obtain different phase-delay values when making, and the groove structure of phase delay layer can reach the ability of other liquid crystal optics layer of orientation, the used cholesterol liquid crystal of optical element for example of the present invention, both collocation can reach the function of blast.In addition, the preparation method of optical element of the present invention need not use optical cement that phase delay layer and cholesteric liquid crystal layer are fitted, and does not therefore have problems such as bubble generation, significantly improves the shortcoming of prior art.
Other implements aspect
Disclosed in this manual all features all may combine with other method, disclosed each feature all may optionally be replaced with identical, equal or similar purpose feature in this instructions, therefore, except special notable attribute, the disclosed feature of this all instructionss only is an example in equal or the similar features.
Though the present invention discloses as above with preferred embodiment, so it is not in order to limiting the present invention, anyly is familiar with this skill person, without departing from the spirit and scope of the present invention, and when being used for a variety of modifications and variations.
Claims (23)
1. an optical element is characterized in that, comprises:
One phase delay layer, it is made of a crosslinked liquid crystal material, and a surface of this phase delay layer has a plurality of grooves side by side; And
One cholesteric liquid crystal layer, it is to combine with aforementioned phase delay layer.
2. optical element as claimed in claim 1 is characterized in that, described cholesteric liquid crystal layer is to coat on the surface of a plurality of grooves side by side of having of aforementioned phase retardation film.
3. optical element as claimed in claim 1 is characterized in that, the cycle of described a plurality of grooves side by side is to be 0.1 micron to 5 microns.
4. optical element as claimed in claim 1 is characterized in that, the wide ratio of the live width/paddy of described a plurality of grooves side by side is to be 0.2 to 5.
5. optical element as claimed in claim 1 is characterized in that, the degree of depth of described a plurality of grooves side by side is to be 0.1 micron to 2 microns.
6. optical element as claimed in claim 1 is characterized in that, described crosslinked liquid crystal material comprises nematic liquid crystal phase liquid crystal material, to palm property nematic liquid crystal phase liquid crystal material, stratose liquid crystal phase liquid crystal material or dish-like liquid crystal material.
7. optical element as claimed in claim 1 is characterized in that, described cholesterol liquid crystal is the pitch with continuous or discrete increasing or decreasing.
8. optical element as claimed in claim 1 is characterized in that, described cholesterol liquid crystal is to have specific pitch.
9. the method for making of an optical element is characterized in that, step comprises:
(a) provide a crosslinked liquid crystal solution, a base material and an impressing mould, this impressing mould is to have a plurality of trench structures side by side;
(b) with aforementioned crosslinked liquid crystal soln using aforementioned impression die marks on aforementioned substrates;
(c) aforementioned crosslinked liquid crystal is solidify to form a phase delay layer, a surface of this phase delay layer has a plurality of grooves side by side; And
(d) on aforementioned phase delay layer, form a cholesteric liquid crystal layer.
10. method as claimed in claim 9 is characterized in that, the cycle of described a plurality of grooves side by side is to be 0.1 micron to 5 microns.
11. method as claimed in claim 9 is characterized in that, the wide ratio of the live width/paddy of described a plurality of grooves side by side is to be 0.2 to 5.
12. method as claimed in claim 9 is characterized in that, the degree of depth of described a plurality of grooves side by side is to be 0.1 micron to 2 microns.
13. method as claimed in claim 9 is characterized in that, described liquid crystal cross linking solution comprises:
The initiator of 0.1-5% percentage by weight;
The crosslinked liquid crystal material of 5-50% percentage by weight; And
The solvent of 50-95% percentage by weight.
14. method as claimed in claim 9 is characterized in that, described step (b) be with aforementioned crosslinked liquid crystal solution coat in the aforementioned substrates surface, utilize aforementioned impression die marks this surface again in aforementioned substrates.
15. method as claimed in claim 9 is characterized in that, described step (b) be with aforementioned crosslinked liquid crystal solution coat in the aforementioned impression die surface, again this impressing mould is impressed in the aforementioned substrates surface.
16. method as claimed in claim 9 is characterized in that, the impressing mould applied pressure of described step (b) is less than every square centimeter 50 kilogram weight.
17. method as claimed in claim 9 is characterized in that, the curing of described step (c) is to utilize to heat-treat less than 200 ℃ temperature.
18. method as claimed in claim 9 is characterized in that, the curing of described step (c) is to utilize rayed, and described optical wavelength range is between 200nm to 600nm.
19. method as claimed in claim 9 is characterized in that, described step (d) is that cholesterol liquid crystal is coated on the phase delay layer that the surface has a plurality of grooves side by side.
20. optical element as claimed in claim 13 is characterized in that, described crosslinked liquid crystal material comprises nematic liquid crystal phase liquid crystal material, to palm property nematic liquid crystal phase liquid crystal material, stratose liquid crystal phase liquid crystal material or dish-like liquid crystal material.
21. optical element as claimed in claim 9 is characterized in that, described cholesterol liquid crystal is the pitch with continuous or discrete increasing or decreasing.
22. optical element as claimed in claim 9 is characterized in that, described cholesterol liquid crystal is to have specific pitch.
23. the LCD as optical element as described in the claim 1～8 is characterized in that the light that a back light of described LCD is sent can hang down and convert linearly polarized light damply to when penetrating this optical element.
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| CNB2005100917420A CN100440000C (en) | 2005-08-17 | 2005-08-17 | Optical element in use for liquid crystal display, and prepartion method |
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| CNB2005100917420A CN100440000C (en) | 2005-08-17 | 2005-08-17 | Optical element in use for liquid crystal display, and prepartion method |
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