Liquid Crystal Display and Optical Compensation Method Therefor

摘要

A liquid crystal display and an optical compensation method therefor are provided specifically for adjusting compensation values of an uniaxial positive birefringence A-compensation film (A-Plate) and an uniaxial negative birefringence C-compensation film (C-Plate) and particularly for controlling a valuing range of a compensation value (Rth) of the C-Plate, so as to reduce the dark-state light leakage by adjusting the compensation values of two types of the compensation film. Thus, the present invention can reduce the dark-state light leakage of a large viewing angle and increase the contrast and definition of the large viewing angle.

主权项

1. A liquid crystal display, wherein the liquid crystal display has a wavelength at 550 nm and a range of an optical path difference (LCΔND) of the liquid crystal is 342.8 nm≦LCΔND≦361.4 nm, the liquid crystal display comprising:
a first substrate; a second substrate; a liquid crystal layer disposed between the first substrate and the second substrate; a first polarizing film disposed on an outer side of the first substrate; a second polarizing film disposed on an outer side of the second substrate; an uniaxial positive birefringence A-compensation film (A-Plate); and an uniaxial negative birefringence C-compensation film (C-Plate), wherein the A-Plate and the C-Plate are disposed between the first substrate and the first polarizing film or disposed between the second substrate and the second polarizing film; wherein a valuing range of an in-plane optical path difference compensation value (Ro) of the A-Plate is 98 nm≦Ro≦172 nm, a valuing range of an out-of-plane optical path difference compensation value (Rth) of the A-Plate is 49 nm≦Rth≦86 nm; a valuing range of a compensation value (Rth) of the C-Plate is Y1≦Rth≦Y2 and Y1 and Y2 satisfies the following functions:
Y1=−0.00083X3+0.22845X2−19.69X+747.33;Y2=0.00021X3−0.07615X2+7.41X+92.29; wherein X is the out-of-plane optical path difference compensation value (Rth) of the A-Plate.