Optical compensator for liquid crystal display

Details Optical compensator for liquid crystal display Optical compensator for liquid crystal display

2005-02-18

2009-12-15

Nelms, David (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S119000

Reexamination Certificate

active

07633582

ABSTRACT:
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)<1in-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)<1.35in-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=[[nx+ny]/2−nz]×d (where nx, nyand nzrepresent 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.

REFERENCES:
patent: 6671017 (2003-12-01), Lyu et al.
patent: 2003/0067572 (2003-04-01), Umeda et al.
patent: 2003/0179326 (2003-09-01), Kawata
patent: 2003/0193636 (2003-10-01), Allen et al.
patent: 2004/0239852 (2004-12-01), Ono et al.
patent: 2006/0119766 (2006-06-01), Mi et al.

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