Retardation film and optical device employing it

G - Physics – 02 – B

Patent

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G02B 5/30 (2006.01) C08G 64/04 (2006.01) C08J 5/18 (2006.01) G02F 1/1335 (2006.01) G02F 1/13363 (2006.01) C09K 19/38 (2006.01)

Patent

CA 2316828

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) < 1 (1), K(450)/K(550) < 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.

L'invention concerne un film à différence de phase, consistant en une feuille de polymère orientée, qui se caractérise en ce que les différences de phase à des longueurs d'onde de 450 nm et 550 nm sont conformes aux formules (1) et/ou (2) suivantes R(450)/R(550) < 1 (1) et K(450)/K(550) < 1, et en ce que leur coefficient d'absorption peut atteindre 1 % en poids. Dans lesdites formules, R(450) et R(550) correspondent respectivement aux différences de phase dans le plan, à des longueurs d'onde de 450 nm et 550 nm, et K(450) et K(550) correspondent à des valeurs calculées par l'équation K=[nz (nx/ny)/2] x d du film polymère orienté à des longueurs d'onde respectives de 450 nm et 550 nm (nx, ny, nz forment un indice de réfraction tridimensionnelle du film polymère orienté et correspondent respectivement aux indices de réfraction dans le sens de l'axe x, l'axe y et l'axe z, et d correspond à l'épaisseur du film). Le film laminé à différences de phase et un dispositif à cristaux liquides dans lequel ledit film est utilisé sont décrits.

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