The present invention relates to an optical system of a liquid crystal video projector that combines a color separation and synthesis combined prism and a polarization beam splitter into a single module so that the device can be compactized. The optical system of the liquid crystal video projector includes a light source 100A. Among the white light emitted from the polarization beam splitter 100 that transmits the P wave and reflects the S wave in the vertical direction, among the white light reflected by the polarization beam separator 100, the red polarization is in one vertical direction and the blue polarization is in the other vertical. S-waves reflected in the direction and the remaining color polarization is transmitted, and each color polarization reflected by the color separation / synthesis prism 200 is imaged, and an S-wave is incident upon application of voltage. Green, red, and blue reflective liquid crystal panels 300, 310, and 32 for converting P into P, and green, red, and blue reflective liquid crystal panels, 300 and 310; And converted into a P wave by the 320, and then synthesized by the color separation / synthesis prism 200 to project each color polarization onto the screen through the polarization beam splitter 100, thereby providing overall Not only can the system be compact, it is easy to precisely process color separation / synthesis, and there is little effect of pressure, thereby increasing the resolution at the time of imaging.
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