Circular polarizer, liquid crystal display device, and...

Details Circular polarizer, liquid crystal display device, and... Circular polarizer, liquid crystal display device, and...

2011-06-14

2011-06-14

Robinson, Mark A (Department: 2883)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S118000, C349S120000

Reexamination Certificate

active

07961276

ABSTRACT:
In the liquid crystal display device of the present invention, a circular polarizer is provided to each of a pair of substrates that hold a liquid crystal layer, wherein the circular polarizer on the display surface side is composed of a polarizer, λ/2 plate in which Rth>0, and a λ/4 plate in which Rth<0; and the circular polarizer on the backlight side is composed of a polarizer, a λ/2 plate in which Rth<0, and a λ/4 plate in which Rth>0. Rth is a retardation in the thickness direction of a λ/2 plate or a λ/4 plate. A reduction is achieved in the absolute value of the sum of the Rth between the λ/2 plate for which Rth>0 and the λ/2 plate for which Rth<0, and in the absolute value of the sum of the Rth between the λ/4 plate for which Rth<0 and the λ/4 plate for which Rth>0. A circular polarizer having excellent wavelength characteristics and excellent viewing angle characteristics when viewed at an angle is thereby obtained, and a liquid crystal display device and a terminal device that use the circular polarizer are obtained.

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Jisaki et al., “Development of transflective LCD for high contrast and wide viewing angle by using homeotropic alignment,” Asia Display, IDW '01, No. LCT8-3, pp. 133-136 (2001).

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