Liquid crystal cells – elements and systems – Liquid crystal optical element – Passive liquid crystal polarizer
Reexamination Certificate
2007-10-30
2007-10-30
Nguyen, Dung T. (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Passive liquid crystal polarizer
C349S117000, C349S193000
Reexamination Certificate
active
10479354
ABSTRACT:
The present invention provides a full color liquid crystal display of passive matrix design that includes a polarizer, an analyzer having a transmission axis, and at least one light generation stage positioned between the polarizer and analyzer for transmitting light of a desired wavelength to the analyzer. This light generation stage includes a first retarder stack that rotates desired wavelengths of light to a particular polarization state, a second retarder stack inverted and rotated by 90 degrees with respect to said first retarder stack, and a passive matrix addressed optical element positioned between the first and second retarder stacks. The retardation and orientation of each of the first retarder stack, second retarder stack, and passive matrix addressed optical element are optimized so as to provide a color generation stage that places desired wavelengths of light substantially along the transmission axis of the analyzer.
REFERENCES:
patent: 5929946 (1999-07-01), Sharp et al.
patent: 6417892 (2002-07-01), Sharp et al.
Bos Philip
Saeed Salman
Fay Sharpe LLP
Kent State University
Nguyen Dung T.
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