Patent ID: 6331878
Filing Date: 2001-12-18
Classification: G02F,G03B

Abstract:
A projection type display apparatus comprising:a light source being operable to emit light, said light source having an arc length greater than 2.5 mm and less than 5.0 mm;light modulating means for forming an optical image as a change in a diffuse state of light, said light modulating means having a light modulating layer;secondary light emitting means for emitting light by condensing and converging the light emitted from said light source;projecting means for projecting the optical image formed by said light modulating means;a first stop being operable to selectively pass primarily the light having passed an effective area of said secondary light emitting means, said first stop having an aperture shape and being arranged on a light incidence side of said light modulating means;a second stop being operable to selectively pass the light having passed said first stop in a light transmitting state of said light modulating layer of said light modulating means, said second stop having an aperture shape and being arranged on a light outgoing side of said light modulating means, whereinsaid light modulating means is illuminated by the light emitted from said secondary light emitting means.