Patent ID: 8251516

Claim:
An optical system comprising: a modulation optical system for combining respective modulated primary color lights with each other in wavelength thereby to produce and output a first composite light, the respective modulated primary color lights being provided by modulating 3-primary color lights by 3-primary color signals produced from an image signal individually, a separator for dividing the first composite light into a P-polarized light and a S-polarized light; a first modulation light generator for modulating the S-polarized light by one of two kinds of luminance signals produced from the image signal thereby to produce a first modulation light; a second modulation light generator for modulating the P-polarized light by the other of the luminance signals produced from the image signal thereby to produce a second modulation light; a photosynthesizer for combining the first modulation light with the second modulation light thereby to produce a second composite light; and a projector for projecting the second composite light, wherein: the first modulation light generator comprises a first device for modulating the S-polarized light, the first device having a number of first pixels, the second modulation light generator comprises a second device for modulating the P-polarized light, the first device having a number of second pixels, and wherein: each of the first pixels is shifted from each of the second pixels by a half of one pixel in horizontal and vertical directions, so that the first pixels and the second pixels are shifted from each other at a slant of 45 degrees by half pixel.