Liquid crystal display device

Abstract

Abstract A liquid crystal display device consisting essentially of a liquid crystal cell and a pair of the polarizing plates disposed on the both sides of said liquid crystal cells is disclosed. The liquid crystal cell has a liquid crystal layer in which a nematic liquid crystal containing an optically active substance and forming a twisted structure is disposed between a pair of the electrode substrates being oppositely disposed and each having an alignment layer, wherein a pretilt angle θ o made by a director of liquid crystal molecules contacting a face of the electrode substrate and the electrode substrate itself is less than 25°. Further, the liquid crystal display device is characterized by satisfying Conditions (a) to (d); Condition (a): a twist angle α of the twisted structure in the liquid crystal layer is 220° to 300°; Condition (b): a product, Δn·d, of a refractive anisotropy Δn, of the nematic liquid crystal and a thickness, d, of the liquid crystal layer is 0.60 to 0.85 μm; Condition (c): in the relation to the twist angle α, angles β and γ made by polarizing axes of a pair of the polarizing plates and the directions of aligning treatments of the electrode substrates adjacent to the respective polarizing plates satisfy Equation (1); α+β-γ-180°=90°-δ Equation (1) 0°<δ<40° Condition (d): a spontaneous twist pitch Ps of the nematic liquid crystal containing the optically active substance and a compulsive twist pitch Pc of the liquid crystal layer in which the twisted structure is forcibly regulated by the alignment layer satisfy Equation (2); (Pc-Ps)/Ps<0 Equation (2) and, in the relation to the twist angle α, the distortion angle β satisfies Equation (3); β=(360-α)/2-δ/2 Equation (3).

Inventors

• 👤 Kazuo Asano
• 👤 Toru Terasaka
• 👤 Shinich Nishi

Bibliographic Details