Retardation film and production thereof

Details Retardation film and production thereof Retardation film and production thereof

1995-04-21

1997-02-11

Nagumo, Mark

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With charge transferring layer of specified composition

25229901, 526279, 349 56, 349182, G02F 113

Patent

active

056018843

ABSTRACT:
A retardation film comprising a polymerized liquid crystal oligomer having positive intrinsic birefringence, also having a glass transition temperature of 50.degree. C. or below and showing nematic or smectic phase, characterized in that the optical axis of the film lies in the film plane, that the value of retardation (product of anisotropy of refractive index .DELTA.n of said film and film thickness d) at 30.degree. C. is 100 nm or above, and that the ratio of the value of retardation at 80.degree. C. to that at 30.degree. C. is 0.95-0.5, allows proper adjustment of the rate of change with temperature in accordance with the rate of change with temperature of the liquid crystal cell used in combination with the film, and can provide liquid crystal display devices showing excellent display performance at high temperatures.

REFERENCES:
patent: 5147682 (1992-09-01), Takiguchi et al.
patent: 5193020 (1993-03-01), Shiozaki et al.
patent: 5247377 (1993-09-01), Omeis et al.
patent: 5308535 (1994-05-01), Scheuble et al.
patent: 5359443 (1994-10-01), Toyooka et al.
Pat Abstr Jpn vol. 16, No. 163 (P-1341) Abstract of JP 4-012,322.

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