PHASE DIFFERENCE FILM AND OPTICAL DEVICE USING IT

Title:

PHASE DIFFERENCE FILM AND OPTICAL DEVICE USING IT

Document Type and Number:

WIPO Patent Application WO/2000/026705

Kind Code:

A1

Abstract:

Phase difference film consisting of one sheet of polymer oriented film, characterized in that phase differences at wavelengths of 450 nm and 550 nm satisfy the following formulae (1) and/or (2) and an absorptance is up to 1 wt.%: R(450)/R(550) $m(f) 1 (1), K(450)/K(550) $m(f) 1 (2), Wherein R(450) and R(550) in the formula are respectively in-plane phase differences at wavelengths of 450 nm and 550 nm, and K(450) and K(550) are values calculated by the equation K=[n¿z?-(n¿x? + n¿y?)/2] x d of polymer oriented film at respective wavelengths of 450 nm and 550 nm (n¿x?, n¿y?, n¿z? form a three-dimensional refractive index of polymer oriented film and are respectively x-axis, y-axis, z-axis direction refractive indexes, and d is a film thickness). Laminated phase difference film and a liquid crystal device using the phase difference film.

Inventors:

UCHIYAMA AKIHIKO (JP)
KUSHIDA TAKASHI (JP)

Application Number:

PCT/JP1999/006057

Publication Date:

May 11, 2000

Filing Date:

October 29, 1999

Export Citation:

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Assignee:

TEIJIN LTD (JP)
UCHIYAMA AKIHIKO (JP)
KUSHIDA TAKASHI (JP)

International Classes:

G02B5/30; G02F1/1335; G02F1/13363; (IPC1-7): G02B5/30; G02F1/1335; C08J5/18

Foreign References:

JPH0857950A	1996-03-05
JPH0682624A	1994-03-25
JPH07287118A	1995-10-31
JPH04116603A	1992-04-17

Other References: