Patent ID: 6072459
Filing Date: 2000-06-06
Classification: G02F,G03B,H04N

Abstract:
A projection-type liquid crystal display apparatus comprising:light source means;a liquid crystal light valve means for modulating a light beam emitted by said light source means;projecting means for projecting a light beam modulated by said liquid crystal light valve means onto a screen;a liquid-crystal temperature detection means for detecting the temperature of a portion adjacent to said liquid crystal light valve means;a transparent conductive film formed adjacent to a surface of said liquid crystal valve means on which an image will be formed, said transparent conductive film being formed on a light path for the light beam emitted from said light source means;drive means for causing said transparent conductive film to generate heat; andcontrol means for controlling heat generating performance of said transparent conductive film in accordance with a value detected by said liquid-crystal temperature detection means,wherein said liquid-crystal temperature detection means includes a plurality of temperature detectors, andsaid control means controls the heat generating performance of said transparent conductive film in accordance with a total sum of a value obtained by multiplying each of values detected by said plurality of temperature detectors with a weighting coefficient.