Light-modulating cell
AssigneeKoninklijke Philips Electronics N.V.
InventorsPeter Van De Witte, Rifat Ata Mustafa Hikmet
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Abstract
A light-modulating cell and a display device based on a chiral nematic liquid crystal material in which the difference of optical rotation power between the planar nematic state and the focal conic state is used for discriminating between optical states, in particular for chiral nematic liquid crystal material having a pitch length associated with infrared light.
Claims20
A light-modulating cell comprising two substrates with a layer of electro-optical material in between, comprising a chiral nematic liquid crystal material which, in co-operation with the substrates, can assume a plurality of states, of which at least a focal conic state and a twisted planar state are stable in the absence of an electric field, said light-modulating cell being also provided with drive means for applying an electric field, wherein the optical rotation of the layer of electro-optical material in the focal conic state and in the twisted planar state has different values and the different values determine switching between a substantially light transmissive state and a substantially light non-transmissive state.
Dependencies are inferred from the claim text.