Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Reexamination Certificate
2011-04-05
2011-04-05
Duong, Thoi V (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
C349S009000, C349S065000, C362S606000, C362S615000
Reexamination Certificate
active
07920226
ABSTRACT:
A display comprises: a transmissive pixilated spatial light modulator (21); and a backlight (22). The backlight has a light-transmissive waveguide (26), with a first face of the waveguide being opposed to the spatial light modulator (21). The first face of the waveguide comprises a plurality of regions that are not totally internally reflective for at least one polarization of light propagating within the waveguide, and the remainder of the first face of the waveguide is totally internally reflective for light propagating within the waveguide. Light is extracted from the waveguide at the regions where first face of the waveguide is not totally internally reflective. The pitch of the regions where first face of the waveguide is not totally internally reflective is substantially an integer multiple of the pitch of the pixels of the spatial light modulator.
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Co-pending U.S. Appl. No. 11/383,813, filed May 17, 2006 (allowed claims provided).
T. Okumura et al.; “Highly-Efficient Backlight for Liquid Crystal Display Having No Optical Films”; Applied Physical Letters; vol. 83, No. 13; pp. 2515-2517; Sep. 29, 2003.
Lesage Etienne
Mather Jonathan
Montgomery David James
Duong Thoi V
Renner , Otto, Boisselle & Sklar, LLP
Sharp Kabushiki Kaisha
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