Patent ID: 7145520

Claim:
A display apparatus for projection of an image-carrying beam having tone values of a single hue from color digital data onto a display surface, the apparatus comprising: (a) a light source for providing a beam of multicolor light, wherein said beam illuminates substantially all of said display surface; (b) a variable filter disposed to provide a periodic attenuation of both color and intensity of a range of component wavelengths of said beam of multicolor light in order to provide a variably tinted beam; (c) a spatial light modulator for modulating said variably tinted beam according to said color digital data to provide said image-carrying beam having tone values of a single hue; (d) a lookup table for mapping digital grayscale data with different bias voltage for each hue; and (e) a control logic processor for modulating said bias voltage to said spatial light modulator, said bias voltage modulation synchronous with said periodic attenuation of said variable filter such that a composite time integrated image carrying beam displays said tone values of a single hue.