Supertwisted nematic liquid crystal device having two phase diff

Details Supertwisted nematic liquid crystal device having two phase diff Supertwisted nematic liquid crystal device having two phase diff

1990-02-06

1992-02-18

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 63, 359102, G02F 113

Patent

active

050899066

ABSTRACT:
The invention relates to a liquid crystal display device wherein phase difference plates equal in retardation value, being composed of uniaxial polymer film or the like, are disposed symmetrically at the front side and back side of an STN liquid crystal panel, and the wavelength dispersion is made nearly ideal. As a result, the phase difference is compensated over the entire wavelength region, and the azimuth angles of the exit ellipsoidal polarization are aligned. Thus, a colorless display and a high contrast may be realized at the same time.

REFERENCES:
patent: 4852976 (1989-08-01), Suzuki
patent: 4909606 (1990-03-01), Wada et al.
patent: 4941737 (1990-07-01), Kimura
patent: 4952029 (1990-08-01), Hayashi et al.

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