Selective reflecting

Abstract

Selective reflective optical apparatus includes a projection screen. The projection screen has structure constructed and arranged to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions.

1 . Selective reflective optical apparatus, 
 a projection screen,    said projection screen having structure constructed and arranged to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions,    and a diffuser on said projection screen constructed and arranged to direct the reflected light to a predetermined viewing location.    
   
   
       2 . Selective reflective optical apparatus in accordance with  claim 1  wherein said diffuser is constructed and arranged with a lenticular pattern.  
   
   
       3 . Selective reflecting optical apparatus in accordance with  claim 1  wherein said diffuser is constructed and arranged to provide asymmetric diffusion constructed and arranged to direct reflected light to a viewing region having a greater span horizontally than vertically.  
   
   
       4 . Selective reflective optical apparatus comprising, 
 a projection screen,    said projection screen having structure constructed and arranged to selectively reflect only incident optical energy of a predetermined number of narrows bands of optical wavelengths regions,    and a linear polarizer on said projection screen, 
 said source of optical energy emitting light polarized in the same direction as said linear polarizer within said predetermined number of narrow bands of optical wavelength regions.  
   
   
   
       5 . Selective reflective optical apparatus comprising, 
 a projection screen,    said projection screen having structure constructed and arranged to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions,    wherein said projection screen is constructed and arranged to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions and significantly attenuate reflection of incident optical energy in bands of optical wavelength regions outside the frequency ranges contained in said predetermined number of narrow bands,    wherein said projection screen comprises a polarizing layer polarized in a given direction.    
   
   
       6 . Selective reflective optical apparatus in accordance with  claim 5  and further comprising 
 a source of optical energy emitting light polarized in the same direction as that of said polarizing layer.    
   
   
       7 . A projection screen having at least one asymmetric diffusion layer of material enclosing oriented glass fibers constructed and arranged so that there is an index of refraction difference between the glass fibers and said material enclosing said glass fibers.  
   
   
       8 . A projection screen having a reflective layer, 
 and a diffusion layer characterized by asymmetry in the z plane perpendicular to the plane of said screen such that light traveling through the diffusion layer towards the reflective layer is diffused less than the light reflected back through the diffusion layer from said reflective layer.    
   
   
       9 . A projection screen in accordance with  claim 8  wherein said diffusion layer comprises a microlens structure having a plurality of microlenses constructed and arranged so that the shape of the microlenses are continuously varied as a function of a microlens position on the plane of the projection screen to produce said asymmetry.  
   
   
       10 . A projection screen in accordance with  claim 8  having a front face wherein said diffusion layer comprises high index-of-refraction material formed with a rough surface having bumps facing away from the projection screen front face that first accepts incident optical energy.  
   
   
       11 . A projection screen in accordance with  claim 10  and further comprising a low index-of-refraction layer bonded to said high index material.  
   
   
       12 . A projection screen in accordance with  claim 11  wherein said low index-of-refraction layer is from the group consisting of a gel and liquid.  
   
   
       13 . A projection screen in accordance with  claim 8  having a front face wherein said diffusion layer comprises a low index-of-refraction material having a rough surface with bumps facing away from the front surface of said screen that receives incident optical energy bonded to a layer of high index-of-refraction material.  
   
   
       14 . A projection screen in accordance with  claim 13  wherein said high index-of-refraction layer is from the group consisting of a gel and liquid.  
   
   
       15 . A projector light source comprising, 
 a first light source that emits light energy over a first relatively broad range of optical frequencies, and    a second light source constructed and arranged to emit light energy over a narrow frequency range of optical frequencies that is significantly less than said broad range.    
   
   
       16 . A light projector in accordance with  claim 15  wherein said narrow frequency range is within a region where said first light source radiates less energy compared to other frequency regions.  
   
   
       17 . A light projector in accordance with  claim 15  wherein said narrow frequency range corresponds to red.  
   
   
       18 . A light projector in accordance with  claim 15  wherein said second light source comprises a plurality of light emitting diodes.  
   
   
       19 . A light projector in accordance with  claim 15  wherein said second source comprises a filtered tungsten filament bulb.  
   
   
       20 . A light projection system comprising, 
 a source of polarized light characterized by polarization of light energy in a predetermined number of narrow frequency regions in a first direction and of light energy in the frequency regions between said narrow frequency regions in a second direction,    a screen having a polarizer constructed and arranged so that light energy in said narrow frequency regions is reflected and in other frequency regions is at least partially absorbed.    
   
   
       21 . A projection system in accordance with  claim 20  wherein said projection screen comprises a multilayer interference coating.  
   
   
       22 . A projection system in accordance with  claim 20  wherein said projection screen comprises phase retarders.  
   
   
       23 . A projection system in accordance with  claim 16  wherein said source of polarized light comprises phase retarders.  
   
   
       24 . Selective reflective optical apparatus comprising, 
 a projection screen,    said projection screen having structure constructed and arranged to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions,    wherein said projection screen is curved so that the angle of incidence of light upon the screen is nearly constant.    
   
   
       25 . Selective reflective optical apparatus comprising, 
 a projection screen,    said projection screen having structure constructed and arranged to selectively reflect only incident optical energy of a predetermined number of narrow bands of optical wavelength regions,    and a source of projected light constructed and arranged to illuminate said projection screen,    said source of projected light providing projected light in frequency regions corresponding to said narrow bands to effect high reflection of light from said projection screen incident from said source of projected light while absorbing high amounts of ambient light,    wherein the wavelength ranges of said narrow bands are optimized for non-UHP bulbs in the associated projector.    
   
   
       26 . Selective reflective optical apparatus in accordance with  claim 1 , wherein said diffuser comprises an adhesive material  
   
   
       27 . Selective reflective optical apparatus in accordance with  claim 26 , wherein said diffuser comprises oriented glass fibers captured in a matrix comprising said adhesive material.  
   
   
       28 . An adhesive layer for use in a projection screen, wherein said adhesive layer is constructed and arranged to diffuse light.  
   
   
       29 . An adhesive layer for use in a projection screen in accordance with  claim 28 , wherein said adhesive layer comprises a matrix of adhesive material and glass fibers captured by said matrix of adhesive material, 
 wherein said matrix of adhesive material and said glass fibers coact to diffuse light.    
   
   
       30 . Selective reflective optical apparatus comprising, 
 a projection screen,    said projection screen having structure constructed and arranged to selectively reflect only incident light energy of a predetermined number of narrow bands of optical wavelength regions and significantly attenuate reflection of incident optical energy in bands of optical wavelength regions outside the frequency ranges contained in said predetermined number of narrow bands,    wherein said projection screen structure comprises a multilayer interference coating of primarily transmissive layers which reflects energy in said predetermined number of narrow bands of optical wavelength regions while transmitting energy outside the frequency ranges contained in said predetermined number of narrow bands of optical wavelength regions,    wherein said structure comprises a multiplicity of absorptive layers incorporated in said multilayer interference coating, and 
 wherein said multiplicity of absorptive layers comprises at least one layer comprising a metal.  
   
   
   
       31 . Selective reflective optical apparatus in accordance with  claim 30 , wherein said metal comprises niobium.  
   
   
       32 . Selective reflective optical apparatus comprising: 
 a projection screen comprising a multilayer coating which reflects energy in a predetermined number of narrow bands of optical wavelength regions while not reflecting energy outside the frequency ranges contained in said predetermined number of narrow bands of optical wavelength regions,    wherein said multilayer coating comprises a plurality of layers of dielectric material incorporated in said multilayer coating, and 
 wherein said multilayer coating comprises a plurality of metal layers incorporated in said multilayer coating.  
   
   
   
       33 . Selective reflective optical apparatus in accordance with  claim 32 , wherein said metal layers comprise at least one layer comprising niobium.  
   
   
       34 . Selective reflective optical apparatus in accordance with  claim 32 , wherein the layers of dielectric material comprises at least one layer of a material from a group consisting of TiO2, Ta2O5, Nb2O5, and SiO2.  
   
   
       35 . Selective reflective optical apparatus in accordance with  claim 34 , wherein said metal layers comprise at least one layer comprising niobium.