G - Physics – 02 – F
Patent
G - Physics
02
F
345/56, 345/59
G02F 1/133 (2006.01) G02F 1/1333 (2006.01) G02F 1/315 (2006.01) G02F 1/141 (2006.01)
Patent
CA 1299721
ELECTRO-OPTIC SWITCHING DEVICES USING FERROELECTRIC LIQUID CRYSTALS ABSTRACT OF THE DISCLOSURE An electro-optic switching device using ferroelectric liquid crystals to either transmit or reflect the incident light depending upon the molecular orientation of the ferroelectric liquid crystal molecules. An applied voltage causes the ferroelectric molecules to switch from a first state in which the incident light is substantially transmitted to a state in which the incident light is substantially reflected. This is accomplished by effectively changing the refractive index of the ferroelectric liquid crystal in the different states. The ferroelectric liquid crystal is disposed between two dielectric mediums such as glass so as to define a boundary which either causes incident light to change direction or its complex amplitude to change, and the smectic layers of the ferroelectric liquid crystals are oriented such that the incident light is selectively switched to one or more outputs. The molecules are also oriented so as to rotate in a plane perpendicular to the applied field, thereby reducing the switching time between the first and second molecular orientations. In addition, the switching effect may be made operative solely by the presence or absence of light by generating the applied electric field from the incident light.
580187
Clark Noel A.
Handschy Mark A.
Displaytech Incorporated
Goudreau Gage Dubuc
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