Patent ID: 6144421
Filing Date: 2000-11-07
Classification: G02F

Abstract:
A reflection mode, ferroelectric liquid crystal spatial light modulating system, comprising:(a) a light reflecting type spatial light modulator including a light reflecting surface cooperating with a layer of ferroelectric liquid crystal light modulating medium switchable between first and second states so as to act on light in different first and second ways, respectively;(b) a switching arrangement for switching the liquid crystal light modulating medium between the first and second states;(c) an illumination arrangement for producing a source of light; and(d) an optics arrangement optically coupled to the spatial light modulator and the illumination arrangement for directing light from the source of light into the spatial light modulator for reflection back out of said modulator and for directing reflected light from the spatial light modulator into a predetermined viewing area, the optics arrangement including(i) a passive wave plate positioned in the optical path between the light source and the spatial light modulator and in the optical path between the spatial light modulator and the viewing area; and(ii) a compensator cell positioned in the optical path between the light source and the spatial light modulator and in the optical path between the spatial light modulator and the viewing area, the compensator cell having a layer of ferroelectric liquid crystal light modulating medium switchable between a primary and a secondary state so as to act on light in different primary and secondary ways, respectively.