Light valve projection system with improved writing control and

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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Details

358 62, 358233, G02B 520, H04N 574

Patent

active

045332169

ABSTRACT:
A light valve projection system is disclosed in which information is impressed on a light modulating fluid (32) overlying a disk (22) wherein incident light from a lamp (10) is modulated by the information and projected onto a viewing surface (33). The fluid layer includes a raster area within which information is written by the deposition of electric charge along scanning lines so as to form diffraction gratings which are parallel to the plane of the disk. An improvement in the operation of the system is achieved by interposing a sharp-cutoff filter between the light source and the light modulating fluid. In a preferred embodiment, the sharp-cutoff filter is part of the dichroic filter plate (26). The use of the sharp-cutoff filter allows the operation of the light valve at high brightness levels while reducing attendant degradation effects of the light modulating fluid and improving the ability to control the desired writing parameters of the light valve.

REFERENCES:
patent: 3247392 (1966-04-01), Theler
patent: 3251940 (1966-05-01), Roussin
patent: 3437746 (1969-04-01), Good et al.

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