Liquid crystal cells – elements and systems – Liquid crystal optical element – Liquid crystal diffraction element
Reexamination Certificate
2007-11-27
2007-11-27
Caley, Michael H. (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Liquid crystal diffraction element
C349S061000, C349S114000, C359S253000
Reexamination Certificate
active
10850714
ABSTRACT:
A thin holographic optical switch used in a liquid crystal display device contains opposing transparent substrates transparent electrodes between the substrates and a diffraction grating between the electrodes. The diffraction grating contains regions of transparent polymerized photopolymers and cholesteric liquid crystal micro-droplets. Refractive indexes of the photopolymers and liquid crystal are substantially the same when the electrodes have the same potential. The holographic optical switch transmits broadband LED light when the potential difference between the electrodes is zero and is polarization independent. The holographic optical switch diffracts broadband LED light when the potential difference between the electrodes is non-zero and is polarization independent.
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Yan-qing Lu, Fang Du and Shin-Tson Wu, “Polarization Switch Using Thick Holographic Polymer-Dispersed Liquid Crystal Grating,” Journal of Applied Physics, vol. 95 No. 3, pp. 8110-815, Feb. 1, 2004.
Aihara Masami
Lin Jibing
Tang Suning
Tang Yuanji
Alps Electric (USA) Inc.
Brinks Hofer Gilson & Lione
Caley Michael H.
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