CN105487157A - Construction and application of electric control light modulation film serving as scattering polaroid - Google Patents
Construction and application of electric control light modulation film serving as scattering polaroid Download PDFInfo
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- CN105487157A CN105487157A CN201410394620.8A CN201410394620A CN105487157A CN 105487157 A CN105487157 A CN 105487157A CN 201410394620 A CN201410394620 A CN 201410394620A CN 105487157 A CN105487157 A CN 105487157A
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Abstract
The invention relates to an electric control light modulation film with a function of strain liquid crystal bending effect scattering polaroid, and the light modulation film consists of two transparent conductive film interlayer strain liquid crystal bending effect films. Strain liquid crystal is a polymer scattering liquid crystal composite material, polymer is an ultraviolet solidification adhesive soft elastomer, and liquid crystal is a nematic phase liquid crystal material. The light modulation film has a total-scattering fog shape, and becomes completely transparent when an electric field is applied to the light modulation film, and then the electric field is removed and the fog state is recovered. When a bending stress is applied to the light modulation film, the light modulation film becomes semi-transparent, and has a function of the scattering polaroid, and then the bending stress is removed, and the fog state is recovered. The electric control light modulation film is clamped in float glass or organic glass, and is suitable for manufacturing a new product which integrates an electric control light modulation window and the scattering polaroid back projection transparent screen.
Description
Technical field
Technical solution of the present invention relates to a kind of structure and the application that double as the electric-controlled light-regulating film of scattering polaroid, belongs to the technical field that the special adhesive of functional polymer and Liquid Crystal Device Physics subject crossing achievement are applied on construction and decoration new material functional glass.
Background technology
Dimming glass is that the transmittance of glass or color outfield are adjustable, there are electric-controlled light-regulating, electrochromism, temperature induced color changing and the technology such as photochromic, electronic-control dimming glass based on Polymer Dispersed Liquid Crystal electric-controlled light-regulating membrane technology is applied widely and industrialization already, and the nowadays bright spot of investment especially.One of application of the present electric-controlled light-regulating film market demand is be used as transparent projection screens unexpectedly, existing transparent projection screens technology is so-called line holographic projections film, the transmittance of holographic film can not change, electric-controlled light-regulating film with it comparatively speaking, many changes of transmittance electric field-tunable.Polaroid is optical element, well-known that apply on a liquid crystal display with viewing three-dimensional film be absorption-type polaroid, natural light is incident, half light absorption, half Transmission light, in addition also also have reflective polaroid and scatter-type polaroid etc., as the term suggests there is half light to reflect, half Transmission light is exactly reflective polaroid; Have half light scattering, half Transmission light is exactly scatter-type polaroid.Projection screen is used as by scatter-type polaroid, adopts single chip liquid crystal projector, when projected light polarization direction is orthogonal with scattering polaroid light transmission shaft, do not have transmitted light to waste, and total scattering occurs, back projection imaging clearly, and effect is magical.Find in Polymer Dispersed Liquid Crystal research, applying stress has impact to the polymerization of polymkeric substance and Liquid Crystal Molecules Alignment state, i.e. stress induced liquid crystal aligning effect, and this research field is called strain liquid crystal (SLC).In previous work, we be engaged in the research of strain liquid crystal technology obtain strain dimming glass a series of patent (200810154177.1,200910070975.0,201210324128.4,201210324127.X, 201310013345.6,201310135804.8), when we turn to making strain light modulation film goods, the new discovery strain liquid crystal buckling effect scattering polarisation phenomenon of film goods, when the water comes, a channel is formed has invented the new product that this electric-controlled light-regulating film and scattering polaroid combine.
Summary of the invention
Technical matters to be solved by this invention is: a kind of electric-controlled light-regulating film doubling as scattering polaroid, and when added electric field does not add stress yet, goods are in scattering mist state, apply electric field goods and become all-transparent state between electrically conducting transparent film; Goods are bent to the very little arc of curvature by not added electric field a little, and goods film the scattering polaroid of translucent state, and light transmission shaft is vertical curve cambered surface direction in curved surface.This light modulation film is clipped between float glass or organic glass again, is just dimming glass or light modulation organic glass, is also the transparent projection screens with scattering spread glass or scattering polarisation organic glass function.
The present invention solves this technical problem adopted technical scheme: a kind of electric-controlled light-regulating film doubling as scattering polaroid, the compound adhesive sheet articles be made up of two panels electrically conducting transparent film and intermediate course elastomer polymer dispersed liquid-crystal film.The polymer dispersion liquid crystal material that the present invention uses is mixed by uv curable oligomer and Nematic phase liquid crystal material, and prepolymer and Nematic phase liquid crystal material form with the mass ratio of about 3: 2.Described prepolymer is made up of alkoxy nonyl phenyl acrylate, the trimethylolpropane triacrylate of 65 ~ 75% and the light trigger 1173 of 3 ~ 5% of 20 ~ 25%, and described number percent is mass percent, and after prepolymer cures, refractive index is roughly n
p~ 1.5.The dielectric anisotropy of described Nematic phase liquid crystal material is about Δ ε > 4, and ordinary refraction index is roughly n
o~ 1.5, very optical index is roughly n
e~ 1.7, birefringence rate variance is more than Δ n ~ 0.2.In electric-controlled light-regulating film of the present invention, the formation of polymer dispersed liquid-crystal film also comprises the gasket material plastic microsphere that diameter is 10 ~ 30 μm, and its consumption is less than 50/cm with glassware areal calculation
2.Wherein said electrically conducting transparent film is plating tin oxide or oxidation Indium tin nesa coating, resistance per square 40 ~ 100 Ω.
Beneficial effect of the present invention: described a kind of electric-controlled light-regulating film doubling as scattering polaroid is scattering mist state under normal conditions, liquid crystal droplet is spherical droplet, liquid crystal molecule is without consistent orientation, the optical property of liquid crystal droplet is neither isotropy common liq, neither anisotropy uniaxial crystal, light beam is not linearly propagated in liquid crystal droplet, occurs to reflect and reflect again, therefore strong light scattering occurs at liquid crystal and polymer interface place because refractive index is suddenlyd change.When applying electric field to polymer dispersed liquid crystal layer, in liquid crystal droplet, liquid crystal molecule is along direction of an electric field roughly orientation, and therefore liquid crystal droplet shows as the character of anisotropy uniaxial crystal, and selective polymer refractive index n
pwith liquid crystal ordinary refraction index n
oequal, when light is perpendicular through Polymer Dispersed Liquid Crystal thin layer, do not have birefringence effect, Transmission light, transmittance is close to 80%.When applying bending stress to polymer dispersed liquid crystal layer, liquid crystal droplet shape becomes inclination prolate ellipsoid shape from spheroidal, liquid crystal molecule along inclined direction roughly orientation, and liquid crystal droplet also can be regarded as anisotropy uniaxial crystal, in rete plane, be n along parallel oblique direction refractive index
ewith refractive index polymer n
punequal and difference is comparatively large, be refractive index n along vertical bank direction
owith refractive index polymer n
pequal.But incidence natural lights can resolve into along inclined direction with two, vertical bank direction component, so half light scattering along inclined direction, along the half Transmission light in vertical bank direction, at this moment light modulation film just has scattering polaroid function.It is scattering polaroid when being in dim translucent state, with single chip liquid crystal (LCD) projector or monolithic liquid crystal over silicon (LCOS) projector supporting, projected light polarization direction is orthogonal with light transmission shaft, light modulation film does not have transmitted light waste, total scattering occurs, and back projection imaging is very clear.
Electric-controlled light-regulating film of the present invention is compared with existing electric-controlled light-regulating film, there is new feature: existing electric-controlled light-regulating film because of the key technical indexes pursue driving voltage low, therefore after prepolymer cures just as duroplasts, weak to liquid crystal molecule grappling effect, almost do not strain light modulation effect.Just as flexible glue skin after the present invention's prepolymer formulation solidification used, electro-optical characteristic is bad, and driving voltage is higher, but strain dimming effect is given prominence to, and pressing, shearing and the bending change that obviously can cause light transmission features, namely have significant " power light characteristic ".
Electric-controlled light-regulating film can be used as transparent projection screens in translucent state and use, but its effect is suitable with holographic transparent projection screen imaging effect, there is no scattering spread glass function, projected light energy roughly 50% transmissive slatterns, scattering back projection imaging clearly before 30%, 20% backward scattering front projection is also more clear.Product of the present invention is pasted to be clipped between 2 ~ 3mm thick float glass or the thick acrylic board of 1 ~ 3mm, applying electric field is electronic-control dimming glass, do not apply electric field but bending stress is applied to glass or acrylic, then light modulation film becomes scattering polaroid, namely the transparent projection screens of effect mystery.If projector is DLP projector, projected light is not polarized light, then projection imaging effect is suitable with line holographic projections film.If add absorption-type polaroid before DLP projector lens projected light is transformed into polarized light, there is total scattering at screen place in projected light, do not have transmitted light to disturb, imaging effect is better.If projector is single chip liquid crystal projector (as Suzhou Lethal Weapon), make screen light transmission shaft direction orthogonal with projected light polarization direction, then scattering polaroid and polarisation projector just constitute gold partner.
Accompanying drawing explanation
Be further explained the present invention below in conjunction with drawings and Examples, obvious electric-controlled light-regulating membrane structure is existing knowledge, needless to say, only needs to provide Fig. 1 the present invention as strain liquid crystal buckling effect scattering polaroid principle schematic at this.In Fig. 1,101---film base material; 102---transparency conducting layer; 103---polymer dispersed liquid crystal layer; 104---observe along liquid crystal droplet vergence direction, do not have scattering polarisation phenomenon, transmittance is higher; 105---bending summit liquid crystal molecule is without consistent orientation, and scattering is opaque; 106---vertical plane observes liquid crystal molecule orientation, and dim translucent, light transmission shaft is along vertical liquid crystal droplet vergence direction in curved surface.
Embodiment
The manufacture of electric-controlled light-regulating film needs to carry out at dust proof workshop, and preparation method is identical with existing UV curing process route, and basic step is:
The first step, preparation prepolymer, alkoxy nonyl phenyl acrylate with 20 ~ 25%, the trimethylolpropane triacrylate of 65 ~ 75% and the light trigger 1173 of 3 ~ 5% prepare prepolymer, are stirred at ambient temperature by potpourri and fully mix for 2 minutes.
Second step, preparation liquid crystal glue, the prepolymer first step prepared and Nematic phase liquid crystal material mix with the mass ratio of 3: 2, and add appropriate plastic microsphere wadding, stirring with stirrer under room temperature makes it be thoroughly mixed to form liquid crystal glue for 2 minutes, and liquid crystal glue is water white transparency state, and viscosity is less.
3rd step, compound, accurate laminating machine carries out overlay film, the uncoiling of two electrically conducting transparent films, win over conducting surface from both direction and clip to laminating machine relatively inwardly to turning between thick roller, between film, inject liquid crystal glue with large syringe, through laminating machine, in two films, clip the interlayer film of liquid crystal glue laminated synthesis thickness high uniformity.
4th step, exposure, is transported to compound film on ultraviolet lamp exposure desk and exposes, ultraviolet lamp intensity 800W/m
2, lamp is apart from 10cm, and exposure 2min, prepolymer polymerization reaction take place, nematic liquid crystal is separated out from polymkeric substance, and form the liquid crystal droplet that diameter is less than 1 μm, products appearance is scattering mist state.
Above-mentioned electric-controlled light-regulating film, all-transparent state is become after applying electric field, do not power up and apply bending stress and become dim translucent state, the scattering of light modulation film, all-transparent and dim translucent three State Transferring can be realized by applying and removing voltage or bending stress, there are electric-controlled light-regulating film and strain liquid crystal buckling effect scattering polaroid two kinds of functions.
Embodiment 1, is used as electric-controlled light-regulating film and uses, and between acrylic board light modulation film being clipped to single-sheet thickness 3mm, draws wire, turns on and off the break-make that power supply just can realize light modulation film and changes.Technical indicator can reach, driving voltage: U < 100V/m
2, OFF state mist degree: H > 90%, ON state transmittance: T ~ 70% (note: existing electronic-control dimming glass technical indicator, driving voltage: U < 50V/m
2, OFF state mist degree: H > 95%, ON state transmittance: T ~ 65%, thick tempered glass is many to light absorption).
Embodiment 2, be used as transparent projection screens to use, between acrylic board light modulation film being clipped to single-sheet thickness 3mm, laminating layer acrylic board is injected in bridge-cut-off aluminum U-type groove picture frame, suppose projector's polarized light in the horizontal direction, then fill in dottle pin material at picture frame the right and left and goods are pushed away forward, and in the middle of the upper and lower both sides of picture frame, fill in dottle pin material by goods and push up backward, just make goods create the bending of horizontal direction, light transmission shaft vertically.Technical indicator can reach, arc length 1m, camber 1cm, transmittance: T > 30%, degree of polarization: P ~ 90% (note: buckling effect has unusual viewing angle characteristic, and curved surface regards parabola as, summit place liquid crystal molecule No yield point, scattering is opaque, parabola both wings liquid crystal molecules tilt orientation, and vertical plane is observed just has scattering polarized light property, and observe along liquid crystal droplet vergence direction, do not have birefringent phenomenon, also just do not have scattering polaroid character, transmittance is higher.Therefore projector should be in curved concave side, and spectators should be positioned at bending convex side, and back projection effectiveness comparison is good.In addition, if be clipped between 3mm thick float glass, do not allow overbend, arc length 1m, action 5mm, also can produce translucent effect).
Claims (8)
1. double as an electric-controlled light-regulating film for scattering polaroid, it is characterized in that it is the compound adhesive sheet articles be made up of two panels electrically conducting transparent plateholder one polymer dispersing liquid crystal layer.
2. a kind of electric-controlled light-regulating film doubling as scattering polaroid according to claim 1, it is characterized in that polymer dispersed liquid crystal layer be by the potpourri of prepolymer and liquid crystal with about 3: 2 mass ratio mix after make through ultraviolet light polymerization under certain condition.
3. a kind of electric-controlled light-regulating film doubling as scattering polaroid according to claim 1, is characterized in that electrically conducting transparent film is the electrically conducting transparent film commodity of plating tin indium oxide, square resistance 40 ~ 100 Ω/.
4. polymer dispersed liquid crystal layer according to claim 2, it is characterized in that prepolymer is 3 ~ 5% to form by polymerisable monomer propoxyl group nonyl phenyl acrylate 25 ~ 25%, trimethylolpropane triacrylate 65 ~ 75% and light trigger 1173, described number percent is mass percent, and after prepolymer cures, refractive index is roughly n
p=1.5.
5. polymer dispersed liquid crystal layer according to claim 2, it is characterized in that described liquid crystal material is positivity nematic liquid crystal, ordinary refraction index is about n
o=1.5, very optical index is about n
emore than=1.7, birefringence rate variance is between 0.2 ~ 0.25.
6. a kind of electric-controlled light-regulating film preparation process doubling as scattering polaroid according to claim 1 is identical with existing electric-controlled light-regulating film ultraviolet light polymerization manufacturing process route: be filled between two panels nesa coating by the potpourri of prepolymer and nematic liquid crystal and plastic microsphere wadding, with accurate laminating machine pressing, be separated through ultraviolet photoetching, products appearance is scattering mist state.
7. a kind of electric-controlled light-regulating film doubling as scattering polaroid according to claim 1, so its product characteristics is at electric-controlled light-regulating film, apply electric field to change to clear state from scattering mist state, remove electric field and revert to scattering mist state, be applied to and make electronic-control dimming glass space partition.
8. a kind of electric-controlled light-regulating film doubling as scattering polaroid according to claim 1, its product characteristics is to have magical strain liquid crystal buckling effect scattering polaroid function, goods are bent, translucent phenomenon can occur, and light transmission shaft is perpendicular to bending direction, and natural light is incident, half Transmission light, half light scattering, its application is that buckling effect scattering polaroid and single chip liquid crystal projector form gold partner, is used as transparent rear projection screen.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110178074A (en) * | 2017-01-13 | 2019-08-27 | 日东电工株式会社 | Optical laminate |
| CN111399297A (en) * | 2019-01-02 | 2020-07-10 | 威斯通全球技术公司 | Curved segmented actively tunable optical lens for display systems |
| CN111487802A (en) * | 2019-01-28 | 2020-08-04 | 北京纳米能源与系统研究所 | Self-driven optical switch and wireless sensing system |
| CN113109551A (en) * | 2021-03-30 | 2021-07-13 | 海南华盛混凝土有限公司 | Concrete collapse and expansion testing device |
| CN113495383A (en) * | 2021-07-28 | 2021-10-12 | 东莞市晶博光电股份有限公司 | Variable three-color module adjusted through microsphere liquid crystal and preparation process thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110178074A (en) * | 2017-01-13 | 2019-08-27 | 日东电工株式会社 | Optical laminate |
| CN111399297A (en) * | 2019-01-02 | 2020-07-10 | 威斯通全球技术公司 | Curved segmented actively tunable optical lens for display systems |
| CN111399297B (en) * | 2019-01-02 | 2024-04-02 | 威斯通全球技术公司 | Curved segmented actively tunable optical lenses for display systems |
| CN111487802A (en) * | 2019-01-28 | 2020-08-04 | 北京纳米能源与系统研究所 | Self-driven optical switch and wireless sensing system |
| CN111487802B (en) * | 2019-01-28 | 2022-10-04 | 北京纳米能源与系统研究所 | Self-driven optical switch and wireless sensing system |
| CN113109551A (en) * | 2021-03-30 | 2021-07-13 | 海南华盛混凝土有限公司 | Concrete collapse and expansion testing device |
| CN113495383A (en) * | 2021-07-28 | 2021-10-12 | 东莞市晶博光电股份有限公司 | Variable three-color module adjusted through microsphere liquid crystal and preparation process thereof |
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