Patent ID: 6715882
Filing Date: 2004-04-06
Classification: G02B,H04N

Abstract:
A projection type display device comprising:an illumination optical system for supplying an illumination radiation; a polarization splitting/color separating optical system for polarization-splitting and color-separating beam from said illumination optical system; reflection type light valves, each taking a rectangular shape, for modulating the beam from said polarization splitting/color separating optical system in accordance with an image signal and letting the modulated beams exit; a color synthesizing optical system for color-synthesizing the beams from said reflection type light valves; a light analyzing optical system for analyzing the beam from said color synthesizing optical system; and a projection optical system for projecting on a predetermined surface an image based on the image signal generated in said reflection type light valves, wherein when the image signal indicates black, said color synthesizing optical system and each of said light valve are positioned so that coordinates in CIE1976UCS chromaticity diagram that show a color of a predetermined point in the vicinity of an apex but inside of the apex of a rectangular display area on the predetermined surface, fall within a distance equal to or less than 0.09 from coordinates in the chromaticity diagram that show a color at the center of said light valve.