Sony Corporation

Mieko Suzuki

Akiko Toriyama

An active matrix drive type liquid crystal display element capable of preventing deterioration of display capability caused by a stripe domain, and a projection type display device using the liquid crystal display element, by which there is provided a projection type display device comprising a light source; a light convergence optical system for guiding a light emitted from said light source to a liquid crystal display element; and a projection optical system for enlarging and projecting a light subjected to light modulation by said liquid crystal display element; wherein the liquid crystal display element is configured by holding a liquid crystal layer between a pair of substrates arranged to face to each other, and a twisted nematic type liquid crystal material used in the liquid crystal layer satisfies dielectric constant anisotropy &#x394;&#x3b5; of 0&#x3c;&#x394;&#x3b5;&#x3c;8 and twist elasticity modulus Kof K&#x3e;6.0 pN when the refractive index anisotropy &#x394;n is 0.16&#x2266;&#x394;n&#x2266;0.18 and satisfies dielectric constant anisotropy &#x394;&#x3b5; of 0&#x3c;&#x394;&#x3b5;&#x3c;13 and twist elasticity modulus Kof K&#x3e;3.0 pN when the refractive index anisotropy &#x394;n is 0.18&#x2266;&#x394;n&#x2266;0.20.

Liquid crystal display element and projection display device

An active matrix drive type liquid crystal display element capable of preventing deterioration of display capability caused by a stripe domain, and a projection type display device using the liquid crystal display element, by which there is provided a projection type display device comprising a light source; a light convergence optical system for guiding a light emitted from said light source to a liquid crystal display element; and a projection optical system for enlarging and projecting a light subjected to light modulation by said liquid crystal display element; wherein the liquid crystal display element is configured by holding a liquid crystal layer between a pair of substrates arranged to face to each other, and a twisted nematic type liquid crystal material used in the liquid crystal layer satisfies dielectric constant anisotropy &#x394;&#x2208; of 0&#x3c;&#x394;&#x2208;&#x3c;8 and twist elasticity modulus Kof K&#x3e;6.0 pN when the refractive index anisotropy &#x394;n is 0.16&#x2266;&#x394;n&#x2266;0.18 and satisfies dielectric constant anisotropy &#x394;&#x2208; of 0&#x3c;&#x394;&#x2208;&#x3c;13 and twist elasticity modulus Kof K&#x3e;3.0 pN when the refractive index anisotropy &#x394;n is 0.18&#x2266;&#x394;n&#x2266;0.20.

Twisted nematic liquid crystal material with certain values for dielectric constant anisotropy, twisted elasticity modulus and refractive index anisotropy

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Kanagawa, Japan

Mieko Suzuki