Patent ID: 6642970
Filing Date: 2003-11-04
Classification: H04N

Abstract:
A projector comprising:a light source configured to emit illuminating light; a single modulation panel configured to modulate the illuminating light in response to a given drive signal, thereby producing image light representing an image; a projection optical system configured to project the image light; a color filter mechanism, disposed in one of an incident-side path and an emergent-side optical path of the single modulation panel, for changing the illuminating light into one of a plurality of colors in a predetermined order; a converging optical system configured to converge the illuminating light on a filter surface of the color filter mechanism; and a controller configured to control the color filter mechanism and the single modulation panel, the color filter mechanism including: a rotatable filter rotor having a plurality of color filters and a plurality of light-blocking mask bands provided at boundaries of the color filters, markings near the mask bands, the markings indicating positions of the mask bands, a marking sensor for identifying the markings to produce marking detection signals, and the controller synchronizes the rotation of the filter rotor and the transfer of the drive signals to the single modulation panel on the basis of the marking detection signals; and a filter driver configured to rotate the filter rotor, and the converging optical system converging the illuminating light such that a size of a spot of the illuminating light on the filter surface is smaller than the individual color filters.