Liquid crystal display device having negative uniaxial anisotropic film with inclined optical axis and protective films

Claim 1

A liquid crystal display device comprising a liquid crystal cell which comprises a pair of substrates provided with a transparent electrode and twist nematic liquid crystal sealed therebetween, a pair of polarizing plates arranged on both sides of the cell each of which comprises a polarizer and a pair of protective films provided both sides of the polarizer, and an optical compensatory sheet between the cell and the polarizing plate which is provided on one side or both sides of the cell; wherein said optical compensatory sheet comprises at least two optically anisotropic films having optically negative uniaxial property, one film having an optic axis in the direction of the normal of the film and other film having an optic axis in a direction inclined at 5 to 50 degrees from the normal, and the sum of Re value of the film having an optic axis in the direction of the normal and Re values of two protective films existing between the polarizers is in the range of 100 to 400 nm, said Re value being defined by the formula: Re={(nx+ny)/2-nz}×d in which nx and ny are main refractictive indices on the plane and nz is a main refractive index in the thickness direction of the film.