| 摘要 |
A color liquid crystal display device has a liquid crystal layer of nematic liquid crystal having positive dielectric anisotropy and including a chiral material, which is interposed between two substrates disposed substantially in parallel, each provided with a transparent electrode and an aligning layer. The twist angle of the liquid crystal layer of liquid crystal molecules determined by the aligning layer of each of the substrates is 160°-300°. A pair of polarizing plates disposed outside the liquid crystal layer. A driving circuit applies a driving voltage across the transparent electrodes. A birefringent plate is disposed between the liquid crystal layer and an upper polarizing plates and a product DELTAn1.d1 of a refractive index anisotropy DELTAn1 of the liquid crystal in the liquid crystal layer and a thickness d1 of the liquid crystal layer is 1.2 mum-2.5 mum. The birefringent plate is formed to have a relation of nx>=nz>=ny wherein nx and ny respectively represent a refractive index (nx>ny) in a film plane direction of the birefringent plate, and nz represents a refractive index in the thickness direction of the birefringent plate (except for a case of nx=nz=ny). The birefringent plate has the sum DELTAn2.d2 of the refractive index anisotropy between a slow axis (a direction of nx in the film plane) and a fast axis (a direction of ny in the film plane), and birefringence in the thickness direction is 1.2 mum-2.5 mum. At least three voltage values are selected to be applied across the transparent electrodes by multiplexing driving.
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