Liquid crystal display device having optical delay plates

Details Liquid crystal display device having optical delay plates Liquid crystal display device having optical delay plates

1989-07-07

1991-07-16

Miller, Stanley D.

350337, 350347R, G02F 113

Patent

active

050320084

ABSTRACT:
This invention discloses a liquid crystal display device including a liquid crystal cell having two substrates, arranged substantially parallel to each other, and having electrodes on their opposing surfaces, and a liquid crystal composition held between the substrates, first and second polarizers arranged at both sides of the liquid crystal cell, a first optical delay plate arranged between the liquid crystal cell and the second polarizer, and a second optical delay plate arranged between the first optical delay plate and the second polarizer, wherein liquid crystal molecules of the liquid crystal composition are arranged in twisted mode from a second polarizer side to a first polarizer side, the first and second optical delay plates are arranged such that optical axes thereof cross to form an acute angle, and a twist direction of the liquid crystal molecules in the state of twisted mode is the same as a direction from the optical axis of the second optical delay plate toward the first optical delay plate shifted by the acute angle. A display performed by the liquid crystal display device of this invention is a high-contrast, bright, and achromatic b/w display. The liquid crystal display device of this invention has a wide viewing angle. The liquid crystal display device of this invention is inexpensive.

REFERENCES:
patent: 4844569 (1989-07-01), Wada et al.
patent: 4852976 (1989-08-01), Suzuki
patent: 4909606 (1990-03-01), Wada et al.

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