Patent
1986-07-23
1988-07-26
Miller, Stanley D.
350338, G02F 113
Patent
active
047596120
ABSTRACT:
A liquid crystal display device comprises a liquid crystal layer sandwiched between upper and lower electrode substrates subjected to aligning treatment. The liquid crystal layer includes a nematic liquid crystal added with a chiral material and has a 160.degree.-360.degree. twisted helical structure. A pair of polarizers are disposed adjacent to the electrode substrates with their polarization or absorption axes inclined by respective predetermined angles with respect to the aligning directions of the electrode substrates. At least one of the polarizers is formed by a color polarizer for compensating a wavelength dependence of transmittance (or the coloring due to birefringence) resulting from the anti-coincidence between the polarization or absorption axis of the polarizer and the aligning direction of the electrode substrate, i.e. an optical axis of liquid crystal molecules adjacent to the substrate, so that light emerging from the device becomes approximately achromatic or colorless.
REFERENCES:
patent: 4497543 (1985-02-01), Aoki et al.
patent: 4541693 (1985-09-01), Knoll et al.
patent: 4610509 (1986-09-01), Sorimachi et al.
patent: 4653861 (1987-03-01), Kando et al.
T. J. Scheffer and J. Nehring, "Optimum Polarizer Combinations for Twisted Nematic Display", Oct. 1976 Conference, Switzerland.
A. R. Kmetz, "A Single-Polarizer Twisted Nematic Display" proceeding of the SID, vol. 21/2, 1980.
Hasegawa Shinji
Kanazaki Mikio
Kando Yasuhiko
Nakatsuka Hideaki
Tojo Toshihiko
Hitachi , Ltd.
Mai Huy V.
Miller Stanley D.
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