Patent ID: 6422704
Filing Date: 2002-07-23
Classification: H04N

Abstract:
A projector, comprising:a light source that can be freely switched on and off; light splitting means for splitting light from the light source, when switched on, into three colors red, green, and blue; three light valves, each of which is incident to light of a different one of the three colors red, green and blue, which each forms an image according to an inputted image signal; light combining means for combining light that has passed the three light valves; a projection lens for projecting the light combined by the light combining means to form an image on a screen; reflected light intensity detecting means for detecting an intensity of light that has been reflected off the screen and back through the projection lens and at least one of the three light valves; and control means for controlling the three light valves to display predetermined patterns and having a projection parameter adjusted according to the intensity detected by the reflected light intensity detecting means.