Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-10-05
1996-07-16
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 68, 359900, 359 22, 359 25, 430 2, G02B 532, G03H 126, G02F 11335
Patent
active
055372325
ABSTRACT:
A multiple-color filter array (94) useful as part of a flat panel display system of either a projection (50) or direct view (70) type is constructed using reflection holography techniques. The filter array includes multiple-color filter elements (110, 114, 116) that reflect wavelengths of light corresponding to colors outside of a color band of interest. Redundant sets of first, second, and third wavelengths selective reflective color filter elements are arranged in stripes to transmit light of the three primary colors red, green, and blue. The three-color filter array is constructed in a single layer (122) of holographic recording material during one sequence of three separate exposures, one for each color filter element. A preferred flat panel display system (200) includes a liquid crystal variable optical retarder of the supertwisted nematic (STN) type. The direct view system includes a spurious light reflection absorber (204), one of whose optical components is selected in association with the residual retardation compensator plate (214) of the preferred liquid crystal variable optical retarder.
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Gross Anita Pellman
In Focus Systems, Inc.
Parker Kenneth
LandOfFree
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