Patent ID: 6784961
Filing Date: 2004-08-31
Classification: G02F,H04N

Abstract:
A liquid crystal display projector comprising:a light source for emitting light required for image display; a transmission type liquid crystal display device having a liquid crystal layer having an alignment of a plurality of twisted liquid crystal molecules, the liquid crystal display device for selectively applying a voltage to the liquid crystal layer in response to an image signal, thereby realigning the liquid crystal molecules and thus modulating light passing through the liquid crystal layer; a projection lens for projecting the light modulated by the liquid crystal display device; a polarizer for allowing linearly polarized light, which is contained in light emitted from the light source, to enter into the liquid crystal display device; an analyzer for allowing linearly polarized light, which is contained in light exiting from the transmission type liquid crystal display device, to enter into the projection lens; and a first optical compensator located between the liquid crystal display device and the analyzer on a light exit side of the liquid crystal display device and containing a substance having birefringence equivalent to birefringence of a negative crystal, the first optical compensator for compensating for an optical phase difference caused by liquid crystal molecules in a light-entry-side region of the liquid crystal layer; a second optical compensator located on the light exit side with respect to the liquid crystal display device and containing a substance having birefringence equivalent to birefringence of a negative crystal, the second optical compensator for compensating for an optical phase difference caused by liquid crystal molecules in the light-exit-side region of the liquid crystal layer; and a third optical compensator located on the light exit side with respect to the liquid crystal display device, the third optical compensator for compensating for an optical phase difference caused by liquid crystal molecules present in a region of the liquid crystal layer excluding the light-entry-side region and the light-exit-side region.