Liquid crystal display with a plurality of phase difference plat

Details Liquid crystal display with a plurality of phase difference plat Liquid crystal display with a plurality of phase difference plat

1990-08-09

1992-06-30

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 73, G02F 11335

Patent

active

051268663

ABSTRACT:
In a supertwist type liquid crystal display device using a supertwist type liquid crystal display cell and an optical compensation plate made of phase difference plates of uniaxial oriented polymer film, the phase difference plates include more than two phase difference plates laminated and disposed on one side or both sides of the liquid crystal display cell with various suitable disposition conditions, so that the whiteness level of the display can be improved. In one example, they are placed so that the retardation value of each of the phase difference plates is added and a cross angle between the slow axis of the first phase difference plate and the slow axis of the nth phase difference plate is 20.degree. to 40.degree., and a further cross angle between the slow axis of the first phase difference plate and the rubbing axis of the substrate adjacent to the liquid crystal display cell is in a range from 70.degree. to 90.degree..

REFERENCES:
patent: 4844569 (1989-07-01), Wada et al.
patent: 4852976 (1989-08-01), Suzuki
patent: 4889412 (1989-12-01), Clerc et al.
patent: 4973137 (1990-11-01), Kozaki
patent: 4984874 (1991-01-01), Yamamoto et al.

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