Optical compensation film, viewing angle compensation...

Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified... – With viewing layer of specified composition

Reexamination Certificate

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C428S001330, C349S117000, C349S096000

Reexamination Certificate

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06881457

ABSTRACT:
An optical compensation film comprising a cellulose ester film is disclosed. In the film, (a) each of photoelastic coefficient C(md) in a mechanical direction and photoelastic coefficient C(td) in the transverse direction of the cellulose ester film is 1×10−9to 1×10−13Pa−1and C(md)<C(td), (b) retardation R0within the plane of the cellulose film defined by Formula (I) is 20 to 70 nm, (c) retardation Rtof the cellulose ester film in a thickness direction, defined by Formula (II) is 70 to 400 nm, and (d) both of a dimensional variation ratio S(md) in the mechanical direction and a dimensional variation ratio S(td) in the transverse direction of the cellulose ester film prior to and after being allowed to stand at ambient conditions of 80° C. and 90 percent relative humidity for 50 hours are −1 to 1 percent, and |S(md)|>|S(td)|.

REFERENCES:
patent: 6417904 (2002-07-01), Yamaoka et al.
patent: 6476892 (2002-11-01), Aminaka
patent: 6559912 (2003-05-01), Aminaka
patent: 2000-154201 (2000-06-01), None
patent: 2002-156527 (2002-05-01), None

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