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US 6,618,103 B2Granted
Liquid crystal display element
AssigneeMinolta Co., Ltd.
InventorsAkihito Hisamitsu, Nobuyuki Kobayashi, Masako Iwamatsu, Hideaki Ueda
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AssigneeMinolta Co., Ltd.
InventorsAkihito Hisamitsu, Nobuyuki Kobayashi, Masako Iwamatsu, Hideaki Ueda
Estimating the term…
In liquid crystal display element having cholesteric liquid crystal between substrates, being substantially polymer free, integral value in visible wavelength range of {exp−[2(λ−nP)2/Δn2P2]}R is 40-60% of integral value in visible wavelength range of function f(λ) representing wavelength-light reflectance spectrum in colored state. In liquid crystal display element having liquid crystal composition between substrates, at least one substrate has functional surface contacting liquid crystal composition, the functional layer being capable of adjusting orientated state of liquid crystal molecules close to substrate and different orientated state of liquid crystal molecules remote from substrate. Chiral nematic liquid crystal, of nematic liquid crystal mixture having refractive index anisotropy of 0.2-0.34 and at least one chiral material, exhibits cholesteric phase at room temperature, has phase transition temperature of 60° C. or higher and positive dielectric constant anisotropy, and wavelength of selectively reflected light is from 480-700 nm.
A liquid crystal display element comprising:
A liquid crystal display element which comprises a pair of opposed substrates and a liquid crystal layer containing a liquid crystal composition and held between the pair of opposed substrates, wherein at least one of the paired substrates has a functional surface in contact with the liquid crystal composition, the functional surface being capable of adjusting an orientated state of liquid crystal molecules in the liquid crystal composition close to the substrate and an orientated state of liquid crystal molecules in the liquid crystal composition remote from the substrate to make the former orientated state different from the latter, wherein the liquid crystal composition is a chiral nematic liquid crystal which comprises a nematic liquid crystal mixture having a refractive index anisotropy of 0.2 to 0.34 and at least one species of chiral materials added to the mixture, and exhibits a cholesteric phase at room temperature, and has a phase transition temperature of 60° C. or higher and a positive dielectric constant anisotropy, and wherein the wavelength range of selectively reflected light in the liquid crystal layer covers the entire range in a range of 480 nm to 700 nm.
Dependencies are inferred from the claim text.