CN101266398A - Composition for back projection screen and preparation method of integral back projection screen - Google Patents
Composition for back projection screen and preparation method of integral back projection screen Download PDFInfo
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- CN101266398A CN101266398A CNA2007100870508A CN200710087050A CN101266398A CN 101266398 A CN101266398 A CN 101266398A CN A2007100870508 A CNA2007100870508 A CN A2007100870508A CN 200710087050 A CN200710087050 A CN 200710087050A CN 101266398 A CN101266398 A CN 101266398A
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Abstract
The invention provides a combination for producing monolithic rear-projection screen by a casting manner and preparing method thereof, a monolithic rear-projection screen and producing method thereof. The combination is principally composed of the following ingredients: a colophony material for forming a transparent substrate for accommodating nano functional material; a nano functional material, whose particle diameter is smaller than 100nm, and whose dosage is 0.2-10% of the weight of the colophony material; a nano-scale contrast control material, which is chosen form a group composed of high colour nano inorganic colors and high colour organic dye, whose particle diameter is smaller than 100nm, and whose dosage is 0.003-0.01% of the weight of the colophony material. A mono-layer casting type nano rear-projection screen provided by the invention is provided with high view angle, high-contrast, natural and soft tache and superior effect.
Description
Technical field
The present invention relates to rear projection screen and preparation method thereof, relate in particular to the composition and method of making the same and integral back projection type screen and the production method thereof that are used for rear projection screen.
Background technology
The large screen back projection display technique is expansion rapidly, application mainly comprises: the monitoring of academic exchange, long-distance education, industry, traffic, railway, shipping, aviation, public security and commander, video display projection, live broadcast, advertisement, science and technology, cultural information issue and reception, all size type military exercises simulated field training etc.Giant-screen, screen splicing wall and super large rear-projection display screen curtain have very big application space.Projection screen is divided into front projection type display screen and rear-projection display screen curtain.Front projection type display screen (abbreviation front projection screen) is the screen that spectators and projector are in homonymy, its scatterer that utilizes screen surface with light to around scattering.Front projection screen brightness is low, and contrast is little, and is subject to the influence of ambient light, only is adapted at dark indoor watching, and because spectators and projector are in the homonymy of screen, if there is the people to explain at screen front, will hinder drop shadow effect.Rear-projection display screen curtain (abbreviation rear projection screen) is a kind of transmissive viewing screen, and spectators and projector are in the both sides of screen, and display effect is greatly improved, so the demand of rear-projection display screen curtain increases day by day.
Rear projection screen is designed to the image that projects the screen back side is injected observation space usually.The observation space of projection system is big (rear-projection simulation trainer) or quite little (as the rear-projection data monitor) quite.The performance of rear projection screen can be described with various screen characteristics, generally comprises undesirable artefacts such as color spot of gain, visual angle, resolution, contrast, existence etc.Wish that generally rear projection screen has high resolving power, high-contrast and big gain, wishes that also screen can scatter light in big observation space.Unfortunately, after a screen improved properties, one or more other screen characteristics tend to become bad.For example, in order to improve the screen gain, just must reduce to be convenient to watch the visual angle of screen.As a result, in order to make the specific back projector display device screen of acceptable performance generally, do that some are compromise at screen characteristic and aspect of performance.Therefore, screen is proposed a requirement, promptly in the required minimum performance standards of the back projector display device that satisfies this screen of use, required overall performance that raising is arranged.
Various types of rear projection screens are provided in the prior art, for example frosted glass formula rear projection screen, Fresnel lens type rear projection screen, microbead type back projection screen etc.
Low, the poor definition of brightness of frosted glass formula rear projection screen.Though Fresnel lens type rear projection screen effect is than frosted glass formula rear projection screen brightness height, sharpness increases, but because the requirement on machining accuracy of Fresenl mirror and cylindrical mirror is very high, so cost is very high, and the screen that is made into oversize is very difficult, does not satisfy growing demand.
Microbead type back projection screen just sees the document record as far back as the eighties of last century initial stage forties, United States Patent (USP) U52 for example, a kind of printing opacity screen or rear projection screen have been narrated in 378,252 Shens, and this screen comprises monofilm layer extinction rete, a plurality of refractive power spherula on printing opacity supporting mass, side of supporting mass.Used refractive power spherula be glass pellet body, natural resin spherula or synthetic resin (for example polymethylmethacrylate) spherula as light transmissive material, spherular diameter is different because of the size of screen itself, generally at 3um between a few mm scopes.This screen not only can use under dark surrounds, and can use under bright light environments.But, under the bright conditions, projection light source intensity must be than strong 20 times under the dark condition.Recent decades, for various reasons, with high costs due to the residing state of the art of microballon production method for example, the structure of microbead type back projection screen and some technological difficulties of manufacture method aspect fail to satisfactorily resolve or the like, make it to fail to be used widely.
U.S. Pat 6,204.971 in put down in writing a kind of rear projection screen, this screen is three film layer structures, be dianegative, opaque bonding rete and be embedded in glass microballoon individual particle layer in the opaque bonding rete, wherein used microballon is the simple glass microballon, and its refractive index is not more than 170 (1.5-1.7).Because the refractive index of used microballon is little, cause the rear projection screen gain that makes low, the brightness and the sharpness of image all have much room for improvement.The rear projection screen of the trilamellar membrane structure of putting down in writing among the Chinese patent CN1428649A, though improve at aspects such as microballon refractive indexes, performance increases, but production technology is still very complicated, the particle size of microballon is still very big, makes thicknesses of layers also bigger, influences the sharpness of screen.
Rear projection screen among the CN 1592868 of U.S. Roehm GmbH application also is by the refraction principle preparation of spherical plastic particles, because the particle diameter of spherical plastic particles is bigger, therefore coating is thicker, can influence gain and sharpness, therefore can not provide very desirable image.
Disclosed a kind of photoimaging functional membrane among the Chinese patent application publication number CN 1641478A, make by the material of main part of weight ratio 65-98%, the nanoparticle of 1-20% and the auxiliary agent of 1-30%, described material of main part comprises tygon, Polyvinylchloride, polypropylene, polyacrylate, polyamide, polyimide and polyurethane, and nanoparticle is TiO2, TiO2/SiO2, iron oxide, mica, TiO2/ mica, aluminium silver powder etc.Disclosed a kind of nano projection display screen material among the Chinese patent application publication number CN1392163A.But, neither good unification or the balance that can accomplish contrast, brightness and sharpness of these screens, still too late Fresnel lens type screen on display effect.And these rear projection screens of the prior art need substrate usually, and for example plastic base or glass substrate form light transmissive films by the method that applies on substrate.The defective that adopts this technology to exist is to be difficult to form uniform film, and the thinner thickness of film and damaging easily, and is subjected to the restriction of substrate.
Therefore, need high-quality can provide high image resolution, with great visual angle, the rear projection screen of the projected image of high definition, and need utilize simple production technology to produce the method for high-quality rear projection screen.
Summary of the invention
An object of the present invention is to provide simple in structure have with great visual angle, the rear projection screen of high-contrast.
Another object of the present invention provides a kind of special-shaped rear projection screen, and its size and dimension can be provided with as required, and curve screens for example is provided, especially the cylinder rear projection screen.
Another object of the present invention provides the rear projection screen that only there is slight reflection the screen one or both sides.
Another object of the present invention provides a kind of simple rear projection screen method for making.By casting process, one-shot forming.
A further object of the present invention provides a kind of composition that is used for forming by casting the individual layer rear projection screen.
According to the invention provides a kind of composition that is used for producing by the casting mode integral back projection type screen, mainly be made of following composition: resin material is used to form the matrix that nano-functional material is held in transparent also conduct; Nano-functional material, particle diameter are less than 100nm, and consumption is the 0.2-10% of resin material weight; The contrast adjustment material, it is selected from the group that is made of dark nano inorganic pigment and dark organic dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight.
According to composition provided by the invention, wherein said resin material is selected from the group of being made up of following material: polyolefin resin, polyalkenylalcohols resin, poly-(methyl) acryl resin; Polyamide.
According to composition provided by the invention, wherein said nano-functional material is selected from: metal or nonmetal oxide and salt, preferred nano silicon-based oxide, nano aluminium oxide, nano zine oxide, nano zircite, nano lanthanum oxide, nano-titanium oxide, nano-cerium oxide, nano oxidized barium or barium sulphate, nano yttrium oxide or its potpourri.
According to composition provided by the invention, wherein said contrast adjustment material is selected from: nano inorganic pigment or organic dyestuff, preferred nickel oxide, chrome black, iron oxide black, cobalt black, graphite, carbon black, black micaceous iron-ore, nigrosine, anthraquinone are black, Prussian blue, ultramarine blue, cobalt blue, copper phthalocyanine blue and indanthrone, more preferably carbon black or phthalocyanine blue.
According to a kind of method for compositions that is used to prepare provided by the invention, may further comprise the steps:
The first step, weighing takes by weighing a certain amount of resin, and is that benchmark takes by weighing the 0.2-10% nano-functional material with the quality of resin, and 0.03-0.1 ‰ contrast adjustment material;
In second step, surface treatment is earlier carried out surface treatment with nano-functional material and/or contrast adjustment material alternatively, to increase the binding ability of they and resin material; Then treated nano-functional material and/or contrast adjustment material are joined in 10%～20% the resin of all resins;
In the 3rd step, dispersion treatment is the silica sand of 2-10mm with adding particle diameter in the potpourri in second step, carries out the sand milling dispersion treatment with homo-mixer, mixing time 15～30min;
In the 4th step, final blend step mixes finely dispersed potpourri with residual resin, and high-speed stirred is even, and isolated by filtration silica sand obtains described composition.
According to a kind of method of producing the integral back projection type screen provided by the invention, may further comprise the steps by the casting mode:
1) be provided for forming the composition of monoblock type individual layer rear projection screen by casting, said composition comprises: resin material, and as the matrix that is used to hold nano-functional material, described resin material is liquid before curing; Nano-functional material, particle diameter are in the scope of 1-100nm, and consumption is the 0.2-10% of resin material weight; The contrast adjustment material, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment or dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight;
2) provide at least two templates to make mould;
3) determine distance between the template according to the size of prepared rear projection screen and thickness, and handle, form mould with the cavity that is used to hold composition with encapsulant carries out at least three limits between template edge sealing;
4) described composition is injected in the described mould;
5) solidify described composition, remove mould, obtain monoblock type individual layer rear projection screen.
According to method provided by the invention, wherein said template is glass, stainless steel, plastics, timber or stupalith.
According to method provided by the invention, wherein said encapsulant is a strip.And described encapsulant and template material are identical or different,
According to method provided by the invention, wherein also be included in and inject before the composition step that template and sealing material use release agent are handled.
According to method provided by the invention, when wherein injecting composition, composition is slowly flowed down along the side of template, form bubble to avoid bringing air into.
According to method provided by the invention, wherein adopt heat curing, radiation curing during curable resin composition or add initiating agent.
According to method provided by the invention, wherein, the inside surface of described template is through inferior optical processing.
According to the integral back projection type screen that method provided by the invention is produced, the thickness of described screen can be 2～10mm, and full-size is at 3m * 8m or 5m * 5m, and described screen is flat screen or curve screens.
According to a kind of back projection type optical projection system provided by the invention, it comprises the integral back projection type screen that projector and above-mentioned method are made.
Individual layer casting type nanometer rear projection screen provided by the present invention has the soft naturally excellent results of high visual angle, high-contrast, color.According to surveying and determination resolution be 30 lines to more than, contrast is greater than 500: 1, gains to be 0.5-2, angle of visibility is greater than 160 degree, color is soft naturally not dazzling.
Rear projection screen according to the present invention has enough mechanical stabilities, and the articles for washing that screen surface can be general cleans.Rear projection screen according to the present invention has hi-vision stability, the information that spectators can observation post presents in long-time and be difficult for generation visual fatigue.
The method according to this invention can be made no seam jumbotron, can make at present up to the full screen in 3m * 8m range of size, and can make larger sized screen by the bonding or hot adhesive technology that melts.
According to casing process of the present invention, can make special-shaped screens such as cylinder, curved surface, if high mechanical strength and the toughness of utilizing macromolecular material to have as special-shaped screen base material, can be made large-scale special-shaped screen with macromolecular material.
Embodiment
According to a first aspect of the invention, provide a kind of composition that is used for forming by casting the individual layer rear projection screen, said composition comprises:
Resin material is used to hold the matrix of nano-functional material, and described resin material is liquid before curing;
Nano-functional material, particle diameter are in the scope of 1-100nm, and consumption is the 0.2-10% of resin material weight;
Nano inorganic pigment or organic dyestuff, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment and dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight.
The kind that is used for resin material of the present invention does not have strict restriction.In general, having preferably, the macromolecular material of transparency can be suitable for.Because the present invention adopts the moulding process of casting, used resin material should be the liquid (fluid) with better flowability before curing, be applicable to that resin material of the present invention comprises heat reactive resin and light-cured resin, can be monomer or oligomer before solidifying.The example that is applicable to the monomer of heat reactive resin or oligomer includes but not limited to polyolefins such as tygon, polypropylene, Polyvinylchloride, polystyrene etc.; Polyene alcohols such as polyvinyl alcohol (PVA), POLYPROPYLENE GLYCOL etc.; Polyacrylate is as (methyl) polymethyl acrylate, (methyl) polyethyl acrylate or monomer whose; Polyamide-based; Polyimides; Zapon and polyvinyl butyral, wherein preferably polyethylene butyral.In this case, preferably add the initiating agent of usual amounts, for example benzophenone, ammonium persulfate, azoisobutyronitrile or the like.In addition, use proper amount of solvent or thinning agent alternatively, these solvents or thinning agent can be alkane such as hexane, heptane, naphthenic hydrocarbon such as cyclohexane, aromatic hydrocarbons such as benzene, toluene, ethylbenzene, lower alcohol such as ethanol, propyl alcohol, low-carbon carboxylate such as ethyl acetate, butyl acetate, ethyl butyrate or its potpourri.Because the present invention adopts the forming method of casting, does not preferably use or use less solvent or thinning agent.
Light-cured resin generally includes polymerisable monomer or oligomer, and optionally an amount of thinning agent, comprises reactive diluent and non-activated thinner and an amount of initiating agent.So-called reactive diluent is meant that it participates in polymerization at solidification process, and non-activated thinner is meant and does not participate in reaction and only play diluting effect in solidification process.The example of oligomer that is applicable to the light-cured resin of the object of the invention includes but not limited to: acryl resin or methacrylic resin; Unsaturated polyester (UP), as dibasic alcohol (ethylene glycol, multicondensed ethylene glycol, propylene glycol, polypropylene glycol, 1, the 4-butylene glycol) with the multipolymer of unsaturated dicarboxylic acid (in Malaysia carboxylic acid, maleic anhydride, the fumaric acid at least a), in this case, preferably add some saturated carboxylic acids as () phthalic acid, succinic acid, hexane diacid, azelaic acid be as the soft readjustment agent; Epoxy acrylate is as bisphenol A epoxy acrylate, phenolic aldehyde epoxy acrylate, amine modified epoxy acrylic ester, phosphoric acid (ester) modified epoxy acrylic ester, halogenated epoxy acrylate, long-chain fatty acid modified epoxy acrylic ester, silicone-modified epoxy acrylate, epoxidized oil acrylate; Urethane acrylate, as the oligomer, 1 of oligomer, isophorone diisocyanate and the polypropylene glycol of isophorone diisocyanate and polyglycol, the oligomer of 4-dicyclohexyl methyl hydride diisocyanate and poly-(1, the 4-butylene glycol); Polyester acrylate, as succinic acid-ethylene glycol-acrylate copolymer, hexane diacid-propylene glycol-methacrylate copolymer; Polyether acrylate is as many ethoxylations tri methylol triacrylate; The acroleic acid esterification polyacrylic resin; Epoxy resin, as bisphenol A epoxide resin, novalac epoxy, the PTMEG glycidol ether; The light-solidifying poly siloxane, as the acroleic acid esterification polysiloxane, epoxy-functional polysiloxane etc.Preferred epoxy acrylate, polyester acrylate, Polyurethane acrylate.Epoxidized oil acrylate, long-chain fatty acid modified acroleic acid esterification resin.
The example that is applicable to the initiating agent of the object of the invention light-cured resin includes but not limited to: (as α, alpha, alpha-dimethyl oxygen base-α-phenyl acetophenone (DMPA), dialkoxy acetophenone, alpha-hydroxyalkyl benzophenone, α-amine alkyl phenones are (as 2-methyl isophthalic acid-[4-first sulfydryl phenyl]-α-morpholine acetone (MMMP) and benzoyl formiate etc. for benzophenone, benzoin, benzil derivant.
The example of reactive diluent that is applicable to the light-cured resin of the object of the invention includes but not limited to: methacrylic acid-beta-hydroxy ethyl ester (HEMA), isobornyl acrylate (BOA), lauric acid methacrylate (LMA), 1,6 hexanediol diacrylate, two/tripropylene glycol diacrylate (TPGDA), trimethylolpropane triacrylate (TMPTA), tetramethylol methane tetraacrylate (PET4A) etc.
" nano-functional material " herein is meant that the characteristic because of its scattering of light that has, refraction or absorption aspect can be used in the optical property inorganic material of imaging performance especially of regulating light scattering layer.
Be applicable to that nano-functional material of the present invention can be inorganic nano material or the organic nano material that can regulate light scattering, this nano-functional material mainly is stable metal or nonmetal oxide and salt, includes but not limited to nano silicon-based oxide SiO
2-x, nano aluminium oxide, nano zine oxide, nano zircite, nano lanthanum oxide, nano-titanium oxide, nano-cerium oxide, nanometer barium compound (baryta or barium sulphate), nano yttrium oxide or its potpourri, preferably include nano silicon-based oxide SiO
2-x, this nano-functional material particle diameter can be for below the 100nm, 10-90nm for example, 20-80nm, or 25-90nm, preferred 20-60nm, more preferably 20-40nm.
The present inventor finds that high specific surface area is for example greater than 600m
2/ g, be preferably greater than 650m
2/ g, more preferably greater than 700m
2/ g, favourable to realizing the objective of the invention is, come the composition that is used for optical imagery of the present invention with such composition, can obtain brightness very preferably, and help weakening more even avoid " solar effect ".When using nano silicon-based oxide, chemical formula SiO
2-xMiddle x value is between 0.2-1, and particle diameter is preferably 20-80nm below 100 nanometers, more preferably 20-60nm, most preferably 20-40nm.Nanoparticle of the prior art also can be used for the present invention.In order to increase combining of nano-functional material and resin material, can use existing surfactant or coupling agent (for example silane coupling agent) that the particulate of nano-functional material is carried out surface treatment.
In the present invention, nano inorganic pigment or organic pigment or dyestuff, it is selected from the group that, ultramarine blue black, Prussian blue by nickel oxide, chrome black, iron oxide black, cobalt black, graphite, carbon black, black micaceous iron-ore, nigrosine, anthraquinone, cobalt blue, copper phthalein indigo plant and indanthrone constitute, be preferably nano inorganic pigment, as nickel oxide, chrome black, iron oxide black, cobalt black, graphite, carbon black, black micaceous iron-ore, carbon black most preferably, its particle diameter is preferably less than 60 nanometers, most preferably less than 40 nanometers.Generally use black pigment, for example carbon black.Also can use other dark dye or pigment, for example brown, dark-brown, blueness, redness etc. as required.
At the composition that is used for forming by casting the individual layer rear projection screen of the present invention, the consumption of nano-functional material is the 0.2-10% of resin material weight, preferred 0.5-5%, more preferably 0.8-2%; The consumption of nano inorganic pigment or organic dyestuff is the 0.05-1 ‰ of resin material weight.The fundamental purpose of using nano inorganic pigment or organic dyestuff is to increase contrast, and its consumption can be adjusted as required.Be used for resin material of the present invention and be generally colourless transparent material, in some cases, some resin material or wherein used adjuvant have color, if this resin material has transparency preferably, then coloured resin also can use, and the consumption that at this moment can reduce the contrast adjustment material does not even use the contrast adjustment material.
At the composition that is used for forming the individual layer rear projection screen of the present invention by casting, comprise the adjuvant that other is conventional alternatively, be included in polymerization initiator, plastifier, lubricant releasing agent and other copolymerizing modifiers etc. that need when solidifying, those skilled in the art can add corresponding adjuvant according to different resins, but need make resin can be solidified into transparent material.
According to a second aspect of the invention, provide preparation to be used for forming the method for compositions of integral back projection type screen by casting, may further comprise the steps: the first step, weighing, take by weighing a certain amount of resin, quality with resin is that benchmark takes by weighing the 0.2-10% nano-functional material, and 0.03-0.1 ‰ nano inorganic pigment or organic dyestuff.Second step, surface treatment, earlier nano-functional material and/or contrast adjustment material are carried out surface treatment alternatively, to increase the binding ability of they and resin material, can use existing surfactant or coupling agent (for example silane coupling agent) that the particulate of nano-functional material is carried out surface treatment; Then treated nano-functional material and/or contrast adjustment material are joined in 10%～20% the resin of all resins.The 3rd step, dispersion treatment, the mode that adopts homo-mixer to utilize sand milling to disperse is carried out dispersion treatment, and stirring rate can be up to 300r/min at least more than the 1500r/min, and mixing time 15～30min can be stand-by.The 4th step joined finely dispersed potpourri in the residue transparent resin (80-90% of approximately total resin), and high-speed stirred is the used sand grains of back isolated by filtration sand milling evenly, obtains being used for forming by casting the composition of monoblock type individual layer rear projection screen.
According to a third aspect of the invention we, provide a kind of method, may further comprise the steps by casting production monoblock type individual layer rear projection screen:
1) be provided for forming by casting the composition of monoblock type individual layer rear projection screen, said composition comprises: resin material, be used to hold the matrix of nano-functional material, and described resin material is liquid before curing; Nano-functional material, particle diameter are in the scope of 1-100nm, and consumption is the 0.2-10% of resin material weight; Nano inorganic pigment or organic dyestuff, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment or dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight;
2) utilize the template of at least two blocks of sheet glass as mould; Alternatively, also can with other material for example material such as stainless steel or pottery as template.
3) determine distance between the template according to the size of prepared rear projection screen and thickness, and template is carried out at least the edge sealing on three limits on base and left and right sides side handle, form and have the mould that is used to hold the composition cavity.The used encapsulant of encapsulation process can be used the material identical or different with the template material, and when for example making template with glass, encapsulant can be used glass, also can be with stainless steel strip or plastics.Template all can not react with composition with encapsulant and separate easily when removing mould.Because encapsulant is clipped between the template, encapsulant is generally strip.Template and encapsulant are preferably handled with release agent with the zone of wanting cured compositions to contact, so that separate easily when removing mould, if just can easily separate with cured compositions, then do not need to use release agent under without the situation of release agent.Release agent can be selected release agent used in the macromolecule cast molding for use.
4) composition with gained in the step 1 is injected in the mould; When injecting composition, composition is slowly flowed down along the side of template, form bubble to avoid bringing air into.
5) solidify described composition, remove mould, obtain monoblock type individual layer rear projection screen.Can adopt heat curing, photocuring (radiation curing) or use initiating agent according to used resin during curable resin composition.Various resin solidification moulding can be carried out according to existing curing process separately, and condition of cure is to the not significantly influence of effect of final products.
The method according to this invention also comprises the amount of calculating required transparent resin and takes by weighing the step of the composition of described amount.
In one embodiment, the present invention's used template of casting is two blocks of tempering sheet glass.The thickness of glass is decided according to the size of casting screen.If screen size is in 100 cun, the thickness of tempered glass can be less than 10mm, if screen size more than 100 cun, the thickness of tempered glass should be 10mm～16mm.The thickness of the monoblock type individual layer rear projection screen that the present invention cast is at about 2～10mm, preferred 3-8mm.If thickness is lower than 2mm, can consider to adopt other manufacturing process, for example apply or spraying; Thickness there is no need to surpass 10mm generally speaking, if desired, also can make the above individual layer screen of 10mm.Mainly be subjected to the restriction of the template size and the strength of materials according to the size of screen of the present invention.The method according to this invention, the size of screen can be very big, can be up to 3m * 8m or 5m * 5m, in addition bigger.Alternatively, glass can carry out surface treatment earlier before tempering, and then carried out tempering and handle.The tempering of glass is handled the mode that adopts this area commonly used.
According to a forth aspect of the invention, the method that a kind of special-shaped rear projection screen is provided and makes special-shaped screen, the size and dimension of special-shaped rear projection screen can be provided with as requested, for example curve screens or spherical screen, especially cylinder rear projection screen.Material that this special-shaped screen is used and preparation method and previously described basic identical by casting production monoblock type individual layer plane rear projection screen used material and method, because substrate resin has thermoplastic property, can make its alteration of form by heating means, so can be with planar materials by suitable Mold Making abnormity screen, for example curve screens is planar materials is made its distortion by heating and the method that vacuumizes and to be close on the curve mold, and cooling makes it form curve screens then.
Another aspect of the present invention provides the rear projection screen that the screen one or both sides have matt effect.This rear projection screen with matt effect need corrode or grinding process in advance to the inside surface as the glass of template when moulding, forms matt surface, so that the surface of the final screen that forms also has matt effect.Alternatively, wherein the one side of a glass is to handle through anti-dazzle, and the one side of another piece is to handle through slight hair side (inferior light).It is will the one side corrosion with solution that can etching glass (for example hydrofluorite) that anti-dazzle is handled, and forms a kind of very shallow anti-dazzle face, and the hair side processing can be handled with sandblast, frosted or caustic solution.Be placed on the inboard respectively through the one side that anti-dazzle is handled and hair side is handled, so that the outside of the screen of final molding has anti-dazzle and matt effect.This rear projection screen with matt effect helps rear projection screen to use in bright environment to from the ambient light of watching side slight reflection only being arranged.When will screen according to the present invention being used for interactive screen, this matt effect is especially useful.For interactive screen, the optical sensor or the imageing sensor that are arranged on projector's one side (the non-side of watching) can be subjected to by the interference of the light of screen reflection, and when screen had matt effect on the surface of projector's one side, this interference can be reduced to minimum.Because screen provided by the invention is all-in-one-piece, its physical strength height needing to be suitable for the occasion of high strength screen.
The present invention also provides a kind of back projection type optical projection system, and it comprises the integral back projection type screen that projector and the method according to this invention are made.
The method according to this invention under the very little situation of coupling agent and nano dye or dyestuff addition, can be earlier mixed coupling agent or nano dye or dyestuff respectively with resin material, preparation concentration is the predispersion of 1%-10%.When surface treatment and dispersion treatment, directly use predispersion then.
Use raw-material manufacturer among the embodiment
Filmogen:
Polymethylmethacrylate, butyl methacrylate: Bei Jing Ming Yue organic glass company limited
The nanometer diffusion material:
Nano-titanium oxide, nano aluminium oxide, nano zine oxide, nano zircite, nano silicon-based oxide: Haitai Nano Material Co., Ltd., Nanjing
Barium sulphate: the Shanghai river titanium white heavy chemicals company limited that jumps
Silane coupling agent: the Shen Da of Beijing Fine Chemical Co., Ltd
The contrast adjustment material:
Goth black dyestuff: the B-56C of Wenzhou Mei Ernuo chemical industry company limited
Carbon black pigment: the huge power chemical industry N330 of company limited in Foochow
Other material adopts the commercially available prod.
Embodiment 1
The preparation composition: get 1000g butyl methacrylate oligomer (hereinafter to be referred as resin), standby.Take by weighing the nano aluminium oxide of 1g and the carbon black of 2g nano silicon-based oxide and 0.03g, mix, add the 0.01g silane coupling agent, carried out surface treatment in 5 minutes with the speed stirring of about 1000r/min.Take out 120g from the 1000g resin, nano material potpourri and this 120g resin with gained merges then, the particle diameter that adds 1/2 volume again is the quartz sand particle of 2-10mm, with the speed high-speed stirred of 1500r/min 15 minutes, after waiting to be uniformly dispersed, add remaining 880g resin, again with the speed high-speed stirred of 1500r/min 10 minutes, the isolated by filtration quartz sand particle obtains being used for the composition of cast molding.Said composition is uniformly dispersed and good stability, places and does not have segregation phenomenon more than 72 hours.
Make screen: two identical 2m * 2m are passed through anti-dazzle and the dull and stereotyped tempered glass of inferior optical processing respectively as template.With 3mm thickness is staggered relatively at interval between two templates, and coat remover at the inwall of template, glass bar with 3mm is handled the edge sealing that mould carries out three limits, standby composition is injected in the cavity between the template, through the heating cure moulding, remove mould, obtaining thickness is the integral back projection type screen (numbering 1.1) of 3mm.
The performance parameter of the rear projection screen of numbering 1.1: gain coefficient 1.3, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 40 lines.
The method of testing of gain coefficient: directly measure with spot meter, utilizing gain coefficient is 2.06 standard jig, at distance screen 80cm place, beating a branch of white light with 1000 lumen projection instrument impinges upon on the target, measure the high-high brightness of target screen with spot meter, measure the high-high brightness of tested screen then with identical method, with target compare calculating get final product the gain coefficient of screen.
Angle of visibility and contrast adopt the method for testing of standard.
The measuring method of sharpness: the testing standard sheet with motion picture screen is measured.The standard test piece of motion picture screen is thrown on the screen at 80cm place through slide projector, and its image is respectively the right lines of 10～50 lines, determines the sharpness of tested screen according to the clearly demand pairs that demonstrate.
Adopt different formulations to repeat foregoing among the embodiment 1, obtain being numbered 1.2 to 1.5 rear projection screen, referring to table 1.
Table 1:
| Numbering | Resin (1000g) | Nano-functional material (maximum particle diameter is less than 100nm) | Nano dye or dyestuff | Screen thickness |
| 1.2 | Polymethylmethacrylate | Barium sulphate 5g, titanium dioxide 1g | Network is deceived 0.02g | 7mm |
| 1.3 | Polymethylmethacrylate | Aluminium oxide 3g, silicon-base oxide 5g | Network is deceived 0.03g | 4mm |
| 1.4 | Butyl methacrylate | Zinc paste 3g, aluminium oxide 3g | Carbon black 0.05g | 5mm |
| 1.5 | Butyl methacrylate | Silicon-base oxide 10g | Carbon black 0.05g | 5mm |
| 1.6 | Butyl methacrylate | Zinc paste 30g, silicon-base oxide 70g | Carbon black 0.1g | 2mm |
| 1.7 | Butyl methacrylate | Barium sulphate 2g, aluminium oxide 3g, silicon-base oxide 15g | Carbon black 0.02g | 3mm |
The performance parameter of the rear projection screen of numbering 1.2: gain coefficient 1.2, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 28 lines.
The performance parameter of the rear projection screen of numbering 1.3: gain coefficient 1.5, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 40 lines.
The performance parameter of the rear projection screen of numbering 1.4: gain coefficient 1.1, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 30 lines.
The performance parameter of the rear projection screen of numbering 1.5: gain coefficient 1.2, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 40 lines.
The performance parameter of the rear projection screen of numbering 1.6: gain coefficient 1.2, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 36 lines.
The performance parameter of the rear projection screen of numbering 1.7: gain coefficient 1.3, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 40 lines.
Embodiment 2
Adopt different resins, repeat each step among the embodiment 1, adopt the glass template of 1m * 1m, prepare individual layer casting nanometer rear projection screen through curing molding.Referring to table 2.
Table 1:
| Numbering | Tree refers to (1000g) | Nano-functional material (maximum particle diameter is less than 100nm) | Nano dye or dyestuff | Screen thickness |
| 2.1 | PE low molecular polymer | Silicon-base oxide 100g | Phthalocyanine blue 0.08g | 2mm |
| 2.2 | The polypropylene oligomer | Aluminium oxide 3g, silicon-base oxide 5g | Carbon black 0.03g | 4mm |
| 2.3 | Carbonate resin | Zinc paste 3g, aluminium oxide 3g | Carbon black 0.07g | 3mm |
| 2.4 | Styrene resin | Silicon-base oxide 70g | Carbon black 0.08g | 2mm |
| 2.5 | Methyl acrylate | Zinc paste 1g, silicon-base oxide 20g | Carbon black 0.005g | 2mm |
| 2.6 | The polypropylene oligomer | Aluminium oxide 3g, silicon-base oxide 3g | Carbon black 0.008g | 10mm |
The screen of numbering 2.1 is adding the amount of resin that adds before the step of silica sand when the preparation composition be 200g, and residual resin is 800g.
The performance parameter of the rear projection screen of numbering 2.1: gain coefficient 1.5, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 42 lines.
The performance parameter of the rear projection screen of numbering 2.2: gain coefficient 1.2, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 36 lines.
The performance parameter of the rear projection screen of numbering 2.3: gain coefficient 1.4, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 42 lines.
The performance parameter of the rear projection screen of numbering 2.4: gain coefficient 1.1, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 42 lines.
The performance parameter of the rear projection screen of numbering 2.5: gain coefficient 1.3, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 38 lines.
The performance parameter of the rear projection screen of numbering 2.6: gain coefficient 1.2, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and about 30 lines of sharpness are right.
Individual layer casting type nanometer rear projection screen provided by the present invention has the soft naturally excellent results of high visual angle, high-contrast, color, and color is soft naturally not dazzling.
Rear projection screen according to the present invention has enough mechanical stabilities, and the articles for washing that screen surface can be general cleans.Rear projection screen according to the present invention has hi-vision stability, the information that spectators can observation post presents in long-time and be difficult for generation visual fatigue.
The method according to this invention can be made no seam jumbotron, can make at present up to the full screen in 3m * 8m range of size, and can make larger sized screen by the bonding or hot adhesive technology that melts.This casting type individual layer screen of the present invention can adopt thermoplastic resin, with the boundary part heating and melting of two screens, bonds to then together and solidifies, can reduce the deterioration of abutting edge visual effect to greatest extent.It is bonding to adopt heat to melt the screen of numbering 2.2, and the visual effect of its intersection can't see significant change at 3 meters.This is to adopt the prior art institute of substrate pad pasting inaccessiable.
Composition according to the present invention can improve the stability of degree of scatter and composition through the sand milling dispersion treatment.According to casing process of the present invention, can make special-shaped screens such as cylinder, curved surface, if high mechanical strength and the toughness of utilizing macromolecular material to have as special-shaped screen base material, can be made large-scale special-shaped screen with macromolecular material.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. composition that is used for producing by the casting mode integral back projection type screen mainly is made of following composition:
Resin material is used to form the matrix that nano-functional material is held in transparent also conduct;
Nano-functional material, particle diameter are less than 100nm, and consumption is the 0.2-10% of resin material weight;
The contrast adjustment material, it is selected from the group that is made of dark nano inorganic pigment and organic pigment and dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight.
2. composition according to claim 1, wherein said resin material is selected from the group of being made up of following material: polyolefin resin, polyalkenylalcohols resin, poly-(methyl) acryl resin; Polyamide.
3. composition according to claim 1, wherein said nano-functional material is selected from: metal or nonmetal oxide and salt, preferred nano silicon-based oxide, nano aluminium oxide, nano zine oxide, nano zircite, nano lanthanum oxide, nano-titanium oxide, nano-cerium oxide, nano oxidized barium or barium sulphate, nano yttrium oxide or its potpourri.
4. composition according to claim 1, wherein said contrast adjustment material is selected from: nano inorganic pigment or organic dyestuff, preferred nickel oxide, chrome black, iron oxide black, cobalt black, graphite, carbon black, black micaceous iron-ore, nigrosine, anthraquinone are black, Prussian blue, ultramarine blue, cobalt blue, copper phthalocyanine blue and indanthrone, more preferably carbon black or phthalocyanine blue.
5. one kind is used for preparing each described method for compositions of claim 1-4, may further comprise the steps:
The first step, weighing takes by weighing a certain amount of resin, and is that benchmark takes by weighing the 0.2-10% nano-functional material with the quality of resin, and the contrast adjustment material of 0.03-0.1 ‰;
In second step, surface treatment is earlier carried out surface treatment with nano-functional material and/or contrast adjustment material alternatively, to increase the binding ability of they and resin material; Then treated nano-functional material and/or contrast adjustment material are joined in 10%～20% the resin of all resins;
In the 3rd step, dispersion treatment is the silica sand of 2-10mm with adding particle diameter in the potpourri in second step, carries out the sand milling dispersion treatment with homo-mixer, mixing time 15～30min;
In the 4th step, final blend step mixes finely dispersed potpourri with residual resin, and high-speed stirred is even, separates silica sand, obtains described composition.
6. method of producing the integral back projection type screen by the casting mode may further comprise the steps:
1) be provided for forming the composition of monoblock type individual layer rear projection screen by casting, said composition comprises: resin material, and as the matrix that is used to hold nano-functional material, described resin material is liquid before curing; Nano-functional material, particle diameter are in the scope of 1-100nm, and consumption is the 0.2-10% of resin material weight; The contrast adjustment material, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment or dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight;
2) provide at least two templates to make mould;
3) determine distance between the template according to the size of prepared rear projection screen and thickness, and handle, form mould with the cavity that is used to hold composition with encapsulant carries out at least three limits between template edge sealing;
4) described composition is injected in the described mould;
5) solidify described composition, remove mould, obtain monoblock type individual layer rear projection screen.
7. method according to claim 6, wherein said template are glass, stainless steel, plastics, timber or stupalith.
8. method according to claim 6, wherein said encapsulant are strip.And described encapsulant and template material are identical or different.
9. method according to claim 6 wherein also is included in and injects before the composition step that template and sealing material use release agent are handled.
10. method according to claim 7 when wherein injecting composition, makes composition slowly flow down along the side of template, forms bubble to avoid bringing air into.
11. method according to claim 7 wherein adopts heat curing, radiation curing during curable resin composition or adds initiating agent.
12. method according to claim 7, wherein, the inside surface of described template is through inferior optical processing.
13. according to the integral back projection type screen that each described method among the claim 6-12 is produced, the thickness of described screen can be 2～10mm, full-size is at 3m * 8m or 5m * 5m, and described screen is flat screen or curve screens.
14. a back projection type optical projection system, it comprises projector and the integral back projection type screen of making according to each described method among the claim 6-12.
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