Pixelized liquid crystal display materials including chiral material adopted to change its chirality upon photo-irradiation

In a light modulating chiral nematic liquid crystal composition, the improvement comprising a cleavable chiral material adapted to change its chirality upon photo-irradiation, said material being present in an amount effective to change the pitch length of the liquid crystal composition upon said photo-irradiation, and wherein said chiral material includes a chiral carbon whereby upon photo-irradiation the chiral carbon is rendered achiral by cleavage of a moiety from said chiral material.

In a light modulating chiral nematic liquid crystal composition, the improvement comprising a chiral material adapted to change its chirality upon photo-irradiation, said material being present in an amount effective to change the pitch length of the liquid crystal composition upon said photo-irradiation, wherein said chiral material has as its dominant reaction product upon photo-irradiation a racemic mixture.

In a light modulating chiral nematic liquid crystal composition, the improvement comprising a chiral material adapted to change its chirality upon photo-irradiation, said material being present in an amount effective to change the pitch length of the liquid crystal composition upon said photo-irradiation, wherein said chiral material has as its dominant reaction product upon photo-irradiation a structural isomer with chirality opposite that of said chiral material.

In a light modulating chiral nematic liquid crystal composition, the improvement comprising a chiral material, having at least one polymerizable double bond, adapted to change its chirality upon photo-irradiation, said material being present in an amount effective to change the pitch length of the liquid crystal composition upon said photo-irradiation, including a polymer matrix forming material having at least one double bond that is polymerizable with at least one polymerizable double bond of said chiral material.

In a light modulating chiral nematic liquid crystal composition, the improvement comprising a chiral material adapted to change its chirality upon photo-irradiation, said material being present in an amount effective to change the pitch length of the liquid crystal composition upon said photo-irradiation, wherein said chiral material is selected from the group consisting of an arylcyano acetic acid, an aryloxy acetic acid, an aryl ketone, a binaphthol, a binaphthalene or combination thereof.

In a light modulating liquid crystal device comprising chiral nematic liquid crystal material adapted to form focal conic and twisted planar textures and cell wall structure confining said liquid crystal, the improvement wherein said liquid crystal material includes a chiral material adapted to change chirality upon application of an energy input, and a plurality of essentially distinct regions within which the liquid crystal has different pitch lengths, whereby said liquid crystal can be made to reflect different wavelengths of light in different regions.