Phase retarder and liquid crystal display using the same

Details Phase retarder and liquid crystal display using the same Phase retarder and liquid crystal display using the same

1991-01-18

1991-10-29

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 73, 359500, G02F 1133

Patent

active

050610422

ABSTRACT:
A phase retarder obtained by uniaxially stretching a thermoplastic resin film, whose retardation value ranges from 30 to 1200 nm and whose color difference .DELTA.E* is not more than 30 as defined with the phase retarder being set between crossed polarizers in such a manner that the optical axis thereof makes an angle of 45.degree. with respect to the planes of polarization of the polarizers, and a liquid crystal display using the phase retarder are disclosed. The phase retarder has a fixed optical axis, a retardation value suited for new optical uses including liquid crystal displays, and freedom from optical color unevenness. The liquid crystal display using the phase retarder exhibits markedly improved image quality.

REFERENCES:
patent: 4238443 (1980-12-01), Levy
patent: 4419399 (1983-12-01), Ichikawa et al.
patent: 4427741 (1984-01-01), Aizawa et al.
patent: 4552436 (1985-11-01), Kozaki et al.
patent: 4592623 (1986-06-01), Yamamoto et al.
patent: 4844569 (1989-07-01), Wada et al.
patent: 4889412 (1989-12-01), Clerc et al.

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