Patent ID: 7270416
Filing Date: 2007-09-18
Classification: G02B,H04N

Abstract:
1. A light modulating unit which modulates an illumination light on the basis of an inputted video signal, the light modulating unit comprising: first and second light modulating sections each of which modulates an illumination light on the basis of a video signal to generate a projection light that is a linearly polarized light; a light path synthesizing section which synthesizes the projection lights generated by the first and second light modulating sections, wherein the light path synthesizing section has a polarization plane, and the projection light generated by the first light modulating section and having a first polarization direction passes through the polarization plane, and the projection light generated by the second light modulating section and having a second polarization direction perpendicular to the first polarization direction is reflected by the polarization plane; and a beam shifting section which sets beams of the projection lights synthesized by the light path synthesizing section, in a shifted state or a non-shifted state on the basis of the directions of polarizations of the projection lights, the beam shifting section switching the shifted state and the non-shifted state synchronously with modulation timings for the first and second light modulating sections.