Phase retarder and process for producing the same

Details Phase retarder and process for producing the same Phase retarder and process for producing the same

1991-05-24

1994-02-08

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359490, 359500, G02B 104, G02B 530

Patent

active

052853039

ABSTRACT:
A phase retarder and a process for producing the same are disclosed. The phase retarder is obtained by shrinking a uniaxially stretched thermoplastic high polymer film in the direction perpendicular to the stretching direction at a lengthwise shrink of at least 2%. The phase retarder has a ratio of a retardation value (R.sub.30) measured on the phase retarder being inclined at a angle of 30.degree. with respect to the orientation axis as an axis of rotation to a retardation value (R.sub.0) measured on the phase retarder being held horizontally, each measured with a polarizing microscope, (R.sub.30 /R.sub.0) of not more than 1.10, and preferably not more than 1.07. A liquid crystal display fitted with the phase retarder exhibits broad viewing angle characteristics while achieving a satisfactory B/W display level.

REFERENCES:
patent: 3447857 (1969-06-01), McCartney
patent: 3614195 (1971-10-01), Vollmer
patent: 5018839 (1991-05-01), Yamamoto et al.
patent: 5042924 (1991-08-01), Terasaki et al.
patent: 5061042 (1991-10-01), Nakamura et al.
Patent Abstracts of Japan, vol. 9, No. 334 (P-147) (2057) Dec. 27, 1985 & JP-A-60 159 704.
Patent Abstracts of Japan, vol. 1, No. 211 (M-501) Jul. 24, 1986 & JP-A-61 051 323.

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