Patent ID: 6592227
Filing Date: 2003-07-15
Classification: G03B

Abstract:
A projection-type image-display apparatus comprising:an optical modulator for displaying a gradational image by controlling the condition of transmission or reflection of light; a lighting unit for irradiating said optical modulator with light; a projection optical system for projecting the light emitted to and transmitted or reflected by said optical modulator; write signal processing means for modulating a write signal transmitted to said optical modulator; projected light quantity control means for controlling the quality of light transmitted or reflected by said optical modulator, said projected light quantity control means including movable diaphragm means and diaphragm drive means; and control signal generation means for controlling said write signal processing means and said projected light quantity control means, said control signal generation means controlling the operation of controlling the quantity of projected light of said projected light quantity control means and that of modulating the write signal of said write signal processing means on the basis of the brightness level of the input image signal.