Reducing color shift

Details Reducing color shift Reducing color shift

2007-05-17

2009-08-11

Wong, Tina M (Department: 2874)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S117000, C349S119000, C349S187000

Reexamination Certificate

active

07573545

ABSTRACT:
A liquid crystal display device reduces the color shift problem typically observed at wide viewing angles; the device includes a phase retardation compensation film, a biaxial compensation film, and a liquid crystal display panel between the two films. Refractive indexes of the phase retardation compensation film having a thickness d1and the biaxial compensation film having a thickness d2are nx1, ny1, nz1, nx2, ny2, and nz2in a first, a second and a third directions perpendicular to each other. The third direction is parallel to the normal directions of the surfaces of the phase retardation compensation film and the biaxial compensation film. Optical compensation values of the phase retardation compensation film and the biaxial compensation film are Rth1and Rth2and derived from [(nx1+ny1)/2−nz1]×d1and [(nx2+ny2)/2−nz2]×d2respectively. Rth1is not less than 50 nm, and the sum of Rth1and Rth2can be equal to 271 nm.

REFERENCES:
patent: 6919946 (2005-07-01), Allen et al.
patent: 7079218 (2006-07-01), Park et al.

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