Patent ID: 7119866
Filing Date: 2006-10-10
Classification: G02F

Abstract:
1. A liquid crystal display device, comprising: a liquid crystal cell which is provided with two substrates to sandwich a liquid crystal and to cause liquid crystal molecules in the liquid crystal to orient substantially vertically to surfaces of the two substrates; first and second polarizing plates which are provided on two sides of the liquid crystal cell, respectively, so that absorption axes of the polarizing plates are orthogonal to each other; a first phase difference film, provided between the first polarizing plate and the liquid crystal cell, having a positive uniaxial anisotropy; and a second phase difference film, provided between the second polarizing plate and the liquid crystal cell, having a negative uniaxial anisotropy, the first and second polarizing plates being provided with respective base films, which are provided so that optical axes of the base films are substantially vertical to the substrates, each of the base films having a negative uniaxial anisotropy, the first phase difference film being provided so that a retardation axis of the first phase difference film is orthogonal to the absorption axis of the first polarizing plate, the second phase difference film being provided so that an optical axis of the second phase difference film is substantially vertical to the substrates, wherein: when a parameter α [nm] relative to Rp is: a parameter β [nm] relative to Rn is: where Rp [nm] is a retardation in an in-plane direction of the first phase difference film, Rn [nm] is a retardation in a thickness direction of the second phase difference film, Rtac [nm] is a retardation in a thickness direction of the base films, and Rlc [nm] is a retardation in a thickness direction of the liquid crystal, the retardation Rp is set to be not less than 80% nor more than 120% of the parameter α, and the retardation Rn is set to be not less than 60% nor more than 90% of the parameter β.