| 摘要 |
Embodiments of an optical compensator for a liquid crystal display is disclosed. One embodiment of the optical compensator includes an A-plate and a C-plate wherein: the retardation of the A-plate satisfies the following formula: <?in-line-formulae description="In-line Formulae" end="lead"?>0.644<R0(450)/R0(550)<1 <?in-line-formulae description="In-line Formulae" end="tail"?> the retardation of the C-plate satisfies the following formula: <?in-line-formulae description="In-line Formulae" end="lead"?>1<Rth(450)/Rth(550)<1.35 <?in-line-formulae description="In-line Formulae" end="tail"?> where R0(450) and R0(550) represent the retardation of the A-plate at wavelengths of 450 nm and 550 nm, respectively, and Rth(450) and Rth(550) are the values calculated by Rth=[[n<SUB>x</SUB>+n<SUB>y</SUB>]/2-n<SUB>z</SUB>]xd (where n<SUB>x</SUB>, n<SUB>y </SUB>and n<SUB>z </SUB>represent the three-dimensional refractive indexes of the C-plate as the refractive indexes in the direction of the x-axis, y-axis and z-axis, respectively, and d represents the thickness of the C-plate) for the C-plate at a wavelength of 450 nm and 550 nm, respectively. Other embodiments are also included.
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