Normally white twisted nematic lcd with positive and...

Details Normally white twisted nematic lcd with positive and... Normally white twisted nematic lcd with positive and...

G - Physics

02

F

G02F 1/133 (2006.01) G02F 1/1335 (2006.01) G02F 1/13363 (2006.01) G02F 1/139 (2006.01)

Patent

CA 2188603

A normally white twisted nematic liquid crystal display is provided for outputting improved viewing characteristics which are defined by high contrast ratios and reduced inversion. The display includes both positive and negative retardation films, the negative films being defined by n x = n y, > n z where the "z" direction is substantially perpendicular to the film plane and the "x" and "y" directions are substantially parallel to the film plane. According to certain embodiments, a pair of positive and a pair of negative retardation films are provided such that the two positive retarders sandwich both the liquid crystal layer and the negative retarders therebetween. By providing the positive and negative retarders with specific retardation values and/or ratios, improved viewing characteristics are provided.

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