Retardation film and optical device employing it

Details Retardation film and optical device employing it Retardation film and optical device employing it

2007-07-31

2007-07-31

Boykin, Terressa (Department: 1711)

Stock material or miscellaneous articles

Composite

Of polycarbonate

C528S196000, C528S198000

Reissue Patent

active

10969794

ABSTRACT:
A retardation film comprised of a single oriented polymer film, characterized in that the retardation at wavelengths of 450 nm and 550 nm satisfies the following formulae (1) and/or (2), and the water absorption is no greater than 1%.in-line-formulae description="In-line Formulae" end="lead"?R(450)/R(550)<1   (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?K(450)/K(550)<1   (2)in-line-formulae description="In-line Formulae" end="tail"?where R(450) and R(550) represent the in-plane retardation of the oriented polymer film at wavelengths of 450 nm and 550 nm, respectively, and K(450) and K(550) are the values calculated by K=[nz−(nx+ny)/2]×d (where nx, nyand nzrepresent the three-dimensional refractive indexes of the oriented polymer film as the refractive indexes in the direction of the x-axis, y-axis and z-axis, respectively, and d represents the thickness of the film) for the oriented polymer film at a wavelength of 450 nm and 550 nm, respectively. There are provided laminated retardation films and liquid crystal display devices employing the retardation film.

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