Image display device and optical low-pass filter

Optics: image projectors – Composite projected image – Multicolor picture

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Details

353 38, 353 84, 349118, 359558, G03B 2114

Patent

active

057555010

ABSTRACT:
An image display device is so adapted as to eliminate image roughness while the resolution of the image is kept as high as possible. 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 the front surface of the image display body. The spatial frequency of the initial minimum value of an modulation transfer function in one direction of the optical low-pass filter is decided by two basic frequency vectors M, N for sampling frequencies determined by the arrangement of pixels in the image display body, and the spatial frequency of the initial minimum value of the modulation transfer function in the other direction of the optical low-pass filter is decided by differences .+-.(N-M) between the basic frequency vectors.

REFERENCES:
patent: 3724938 (1973-04-01), Nepela
patent: 5005968 (1991-04-01), Tejima et al.
patent: 5046827 (1991-09-01), Frost et al.
patent: 5250967 (1993-10-01), Miyashita
patent: 5300942 (1994-04-01), Dolgoff
patent: 5513025 (1996-04-01), Watanabe et al.

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