Twisted nematic liquid crystal display device having a particula

Details Twisted nematic liquid crystal display device having a particula Twisted nematic liquid crystal display device having a particula

1987-02-20

1988-10-25

Miller, Stanley D.

350341, 350350R, G02F 113

Patent

active

047799609

ABSTRACT:
The twisted nematic liquid crystal display device of this invention relates to a liquid crystal cell having a twisted spiral structure by disposing a pair of substrates opposedly to each other with the rubbed orientation films formed on the electrodes, placing a nematic liquid crystal having a positive dielectric anisotrophy containing an optically active substance between this pair of substrates, and shifting the orientation direction of the liquid crystal molecules by a specified angle of .phi. on both substrates, in which the angle .phi. is set in a range of 210.degree..ltoreq..phi..ltoreq.300.degree., and the ratio d/p of the spiral pitch p of the liquid crystal molecules to layer thickness d of the liquid crystal cell is set in a range of (.phi./360-1/4)<d/p<.phi./360.

REFERENCES:
patent: 4494824 (1985-01-01), Nakamura et al.
patent: 4653865 (1987-03-01), Kando et al.
Scheffer et al, "SID International Symposium", pp. 120-123 (1985).

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