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Abstract

First polarizing beam splitters have respective first polarization separating surfaces arranged perpendicularly to each other. Each of the first polarization separating surfaces transmits the P-polarization component of a light beam emitted from a light source and reflects its S-polarization component. Each of first light beam reflecting elements reflects the S-polarization component reflected by the first polarization separating surface and a light beam directly inputted from the light source. Second polarizing beam splitters have respective second polarization separating surfaces, each of which transmits the P-polarization component of the light beam inputted from the light source and reflected by the first light beam reflecting element and reflects the S-polarization component. Each of second light beam reflecting elements reflects toward a liquid crystal display device the P-polarization component transmitted from the second polarization separating surface. Phase plates convert the S-polarization components that have been separated by the first and second polarizztion separating surfaces to P-polarization components by rotating their polarization directions by 90.degree..

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First Claim