Projector and phase difference plate and method of arranging...

Details Projector and phase difference plate and method of arranging... Projector and phase difference plate and method of arranging...

2007-04-03

2007-04-03

Dudek, James (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

Reexamination Certificate

active

10497760

ABSTRACT:
Provided are a projector capable of correcting a polarization state properly and improving image quality, a retardation plate being used in a projector or the like and being capable of correcting a polarization state properly, and a method of placing a retardation plate. A quarter-wave plate (22) is placed between a reflective spatial light modulator (21) and a PBS (20). The quarter-wave plate (22) includes a combination of a first retardation plate (41) and a second retardation plate (42) each producing a different phase difference. The phase differences produced by two retardation plates (41), (42) are set to be suitable amounts of phase difference according to a position state, so in spite of the fact that the quarter-wave plate (22) including the combination of two retardation plates, the quarter-wave plate (22) can correct the polarization state properly with performance equal to or higher than that in the case where the quarter-wave plate includes a single plate.

REFERENCES:
patent: 5311340 (1994-05-01), Murata et al.
patent: 5337174 (1994-08-01), Wada et al.
patent: 5440413 (1995-08-01), Kikuchi et al.
patent: 05-027118 (1993-02-01), None
patent: 06-230222 (1994-08-01), None
patent: 10-026756 (1998-01-01), None
patent: 2003-121645 (2003-04-01), None
patent: 2003-222724 (2003-08-01), None

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