Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-12-22
1993-12-07
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 65, 359 73, 359495, 353122, G02F 1133, G03B 2100
Patent
active
052687759
ABSTRACT:
A reflective liquid crystal light valve projection system employs a polarizing beam splitter (16) to reflect light from a high intensity arc lamp (10) to a liquid crystal light valve (34) that is controlled by an image generator (36). Light reflected from the liquid crystal light valve is transmitted through the polarizing beam splitter (16) to a projection lens (38) and projected on a screen. Ghost images of the arc lamp source and diminished contrast are caused by light reflected from surfaces of the lens elements back to the liquid crystal light valve and then retroreflected back through the lens. The ghost images and diminished contrast are eliminated by interposing a broad band quarter wave plate between the lens and the polarizing beam splitter.
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Duong Tai V.
Hughes-JVC Technology Corporation
Sikes William L.
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