Liquid crystal cells – elements and systems – Particular structure – Lens or prism separate from projection system
Patent
1995-08-30
1998-04-07
Sikes, Wiiliam L.
Liquid crystal cells, elements and systems
Particular structure
Lens or prism separate from projection system
349104, 349109, 349112, 359569, 348342, G02F 11335, G02B 2746, G09F 900
Patent
active
057370427
ABSTRACT:
An image display device is so adapted as to eliminate both largest and next largest noise components. The image display device includes an image display body having a plurality of pixels arranged periodically in two dimensions and an optical low-pass filter placed on or above the front surface of the image display body. One of two cut-off spatial frequencies in at least one direction of the optical low-pass filter is set within a range of values greater than 1/4 and less than 3/4 of a specific sampling frequency (that having the second lowest frequency) among sampling frequencies determined by the pixel arrangement of the image display body, and the other of the two cut-off spatial frequencies is set within a range of values greater than 3/4 and less than 5/4 of the specific sampling frequency, where the specific sampling frequency is taken as being 1.
REFERENCES:
patent: 5046827 (1991-09-01), Frost et al.
patent: 5300942 (1994-04-01), Dolgoff
patent: 5513025 (1996-04-01), Watanabe et al.
patent: 5550663 (1996-08-01), Nishizaki et al.
patent: 5621487 (1997-04-01), Shirochi
Aoyama Shigeru
Shinohara Masayuki
Duong Tai V.
Omron Corporation
Sikes Wiiliam L.
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