Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1997-02-28
1998-08-18
Henry, Jon W.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359599, 359460, 348757, G02B 532, G02B 502, G03B 2156
Patent
active
057964998
ABSTRACT:
A projection screen is provided having a construction well-suited for effecting lateral color constancy in rear screen projection display systems. The inventive projection screen comprises a rigid light-transmissive faceplate and a homogenizing holographic transmission diffuser element proximate said faceplate. The holographic transmission diffuser element is made such that, upon illumination of an area of said diffuser element with a light beam having a wavelength of 400 nm to 700 nm, and impinging at an incident input angle of .+-.0.degree. to 30.degree. relative to normal incidence, said holographic transmission diffuser element produces in transmission a single diffuse output lobe, the diffuse output lobe produced in one area of said holographic transmission diffuser element having a relative angular intensity distribution and aspect ratio substantially identical to the relative angular intensity distribution and aspect ratio of diffuse output lobes produced in substantially all other areas of said holographic transmission diffuser element.
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de Luna Renato M.
Henry Jon W.
Polaroid Corporation
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