Patent ID: 6217173
Filing Date: 2001-04-17
Classification: G03B

Abstract:
An illuminating system for a liquid crystal projector comprising:a light source device for providing a light beam;a polarizing beam-splitting device for converting the light beam into a p-polarized light beam and a s-polarized light beam, said polarizing beam-splitting device being a wedge having a polarizing semi-reflector formed thereon;a first lens plate for converging the p-polarized light beam and the s-polarized light beam into a plurality of light spots;a polarization rotating device for passing the light spots of one of the s- and p-polarized light is passed by the device while the other is rotated so as to output the plurality of light spots with a certain polarization; anda second lens plate for projecting the plurality of light spots to form a plurality of light beams having the certain polarization, in which the plurality of light beams are overlapped on a converging lens to form a polarized light beam that is converged on a liquid crystal panel.