Cholesteric liquid crystal color filter and process for producing the same
AssigneeFuji Photo Film Co., Ltd.
InventorMitsuyoshi Ichihashi
Life of this patent
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Abstract
A selectively reflective film and a process for producing the selectively reflective film, comprising the steps of forming on a substrate, a layer of a liquid crystal composition comprising a liquid crystal compound, a photoreactive chiral compound and a polymerization initiator; irradiating the layer with a first light to establish a distribution of exposure in the liquid crystal composition; raising the temperature of the liquid crystal composition layer to transform the composition into a liquid crystal state, thereby forming an area where selective reflection is attained in accordance with the distribution of exposure; and irradiating the liquid crystal composition with a second light to cause polymerization or cross-linking and thereby harden the composition.
Claims20
A process for producing a selectively reflective film comprising the steps of:
- forming, on a substrate, a liquid crystal composition layer exhibiting a smectic phase state, a microcrystalline state or a glass state, the liquid crystal composition containing a photoreactive chiral compound, a polymerization initiator, and a liquid crystal compound having at least one polymerizable group;
- establishing a distribution of exposure in the liquid crystal composition layer by irradiating the liquid crystal composition layer exhibiting the smectic phase state, the microcrystalline state or the glass state with a first light;
- forming a selectively reflective area in accordance with the distribution of exposure by raising the temperature of the liquid crystal composition layer, in which the distribution has been established, such that the liquid crystal composition is transformed to a liquid crystal state;
- and
- hardening the liquid crystal composition by irradiating the liquid crystal composition layer, in which the selectively reflective area has been formed, with a second light to cause polymerization or cross-linking.
A selectively reflective film obtained by a production process comprising the steps of:
- forming, on a substrate, a liquid crystal composition layer exhibiting a smectic phase state, a microcrystalline state or a glass state, the liquid crystal composition containing a photoreactive chiral compound, a polymerization initiator, and a liquid crystal compound having at least one polymerizable group;
- establishing a distribution of exposure in the liquid crystal composition layer by irradiating the liquid crystal composition layer exhibiting the smectic phase state, the microcrystalline state or the glass state with a first light;
- forming a selectively reflective area in accordance with the distribution of exposure by raising the temperature of the liquid crystal composition layer, in which the distribution has been established, such that the liquid crystal composition is transformed to a liquid crystal state;
- and
- hardening the liquid crystal composition by irradiating the liquid crystal composition layer, in which the selectively reflective area has been formed, with a second light to cause polymerization or cross-linking.
Dependencies are inferred from the claim text.