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Abstract

A high efficiency liquid crystal display projection system is provided, which can effectively use the energy of s-polarized light and p-polarized light emitted from the light source. The high efficiency liquid crystal display projection system can simplify the structure of light splitting/combining prism by using the feature that the effective optical aperture of a reflective liquid crystal light valve is larger than 85%. Using a broadband polarizing beam-splitting prism to combine/split light, the volume of the liquid crystal display projection system is significantly reduced. The high efficiency liquid crystal display projection system comprises: a dichroic module for sequentially separating a white light into three primary-color lights; a broadband polarizing beam-splitting device for respectively transmitting and reflecting p-polarized light and s-polarized light of the three primary-color lights; two fast time response liquid crystal light valves for receiving and reflecting respectively the p-polarized light and the s-polarized light of the three primary-color lights so that the p-polarized light is converted to s-polarized light and the s-polarized light is converted to p-polarized light; and projection lenses for projecting the light beam to a screen after the s-polarized light and the p-polarized light reflected by the liquid crystal valves are respectively reflected and transmitted by the broadband polarizing beam-splitting device.

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First Claim