Projection type liquid crystal display apparatus using multiple

Details Projection type liquid crystal display apparatus using multiple Projection type liquid crystal display apparatus using multiple

1995-02-15

1996-09-10

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 41, 359 72, 359639, G02F 11335, G02B 2712

Patent

active

055551866

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..

REFERENCES:
patent: 5221982 (1993-05-01), Faris
patent: 5283600 (1994-02-01), Imai

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