Patent ID: 7963657

Claim:
A projection display device, comprising: a light source; a plurality of imagers each arranged in correspondence to a light beam in a wavelength band to be modulated; a light synthesizing element for synthesizing the light beams in the wavelength bands modulated by the imagers; a first polarization regulating element for converting the light beam in one of the wavelength bands into a linearly polarized beam having a polarization direction orthogonal to a polarization direction of the light beam in the other wavelength band for incidence onto the light synthesizing element; a projection optical system for enlarging and projecting light synthesized by the light synthesizing element; and a second polarization regulating element disposed between the light synthesizing element and the projection optical system, wherein each of the imagers is disposed in a state that a center of the each imager is optically shifted with respect to an optical axis of the projection optical system, and the second polarization regulating element regulates the polarization direction of the light beam in a predetermined wavelength band among the light beams in the wavelength bands in such a manner that the polarization direction of the light beam in the predetermined wavelength band is approximated to a shifting direction of the center of the corresponding imager with respect to the optical axis of the projection optical system.