Liquid crystal handedness switch and color filter

Details Liquid crystal handedness switch and color filter Liquid crystal handedness switch and color filter

G - Physics

02

F

G02F 1/1333 (2006.01) G02B 5/30 (2006.01) G02F 1/1335 (2006.01) G02F 1/1347 (2006.01) G02F 1/135 (2006.01) G02F 1/139 (2006.01) G02F 1/141 (2006.01)

Patent

CA 2173586

This invention provides a liquid crystal polarization switch (10. 20), and optical devices employing the handedness switch in conjunction with optical elements which are sensitive to the handedness of incident light. The handedness switch (10, 20) receives unpolarized light and converts it into circularly polarized light with switchable handedness. In combination with cholesteric circular polarizers (30, 35), switchable color filters are provided. The color filters of this invention include the analogous x-y polarization switch combined with colored partial polarizers. The liquid crystals employed in the color filter of this invention can include SmC*, SmA*, antiferroelectric, DHF, achiral ferroelectric and twisted nematic liquid crystals.

L'invention concerne un commutateur (10, 20) d'orientation de polarisation à cristaux liquides, et des dispositifs optiques utilisant ce commutateur avec des éléments optiques sensibles à l'orientation de la lumière incidente. Le commutateur d'orientation (10, 20) reçoit la lumière non polarisée et la transforme en lumière circulairement polarisée, dont l'orientation peut être modifiée par le commutateur. Outre les polariseurs circulaires cholestériques (30, 35), des filtres colorés pouvant être commutés sont prévus. Ces filtres couleurs comprennent le commutateur de polarisation x-y analogique combiné à des polariseurs partiels colorés. Les cristaux liquides utilisés dans le filtre coloré selon la présente invention peuvent comprendre des cristaux liquides SmC*, SmA*, antiferroélectriques, DHF, achiraux ferroélectriques et nématiques.

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