Twisted nematic liquid crystal material with certain values...

Details Twisted nematic liquid crystal material with certain values... Twisted nematic liquid crystal material with certain values...

2006-10-17

2006-10-17

Schechter, Andrew (Department: 2871)

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Within nematic phase

C349S180000, C349S181000, C349S167000

Reexamination Certificate

active

07123336

ABSTRACT:
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 Δ∈ of 0<Δ∈<8 and twist elasticity modulus K22of K22>6.0 pN when the refractive index anisotropy Δn is 0.16≦Δn≦0.18 and satisfies dielectric constant anisotropy Δ∈ of 0<Δ∈<13 and twist elasticity modulus K22of K22>3.0 pN when the refractive index anisotropy Δn is 0.18≦Δn≦0.20.

REFERENCES:
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patent: 08-101403 (1996-04-01), None
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