Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1998-09-02
1999-12-07
Henry, Jon
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359599, 359641, 359456, 156166, G02B 532, G02B 502, G02B 2160, B32B 3100
Patent
active
059992816
ABSTRACT:
A projection screen having a construction well-suited for effecting lateral color constancy in rear screen projection display systems is disclosed. The projection screen includes a holographic transmission diffuser element capable of diffusing a beam of light into a horizontally-elliptical cone and a light-collimating element for uniaxially-collimating by transmission an expanding wavefront with the axis of collimation substantially orthogonal to a horizontal viewing axis. The use of the projection screen in a rear screen projection display system including red, green and blue image projectors is also disclosed. A method of manufacturing a holographic projection screen by drawing a holographic transmission diffuser web and a uniaxial light collimating web into overlapping relationship and bonding the webs is also disclosed.
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Abbott Lynore M.
Wenyon Michael M.
de Luna Renato M.
Henry Jon
Polaroid Corporation
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