Patent ID: 7755727
Filing Date: 2010-07-13
Classification: G02F

Abstract:
1. A rectangular liquid crystal display module which comprises: a liquid crystal display element in which a liquid crystal cell is sandwiched between a pair of polarizing plates, an optical sheet overlaid on the back face side of the liquid crystal display element, and a surface illuminant backlight overlaid on the back face side of the optical sheet, the backlight being an edge light type backlight with polarized light, wherein the optical sheet comprises a resin substrate film having an optical anisotropy such that: an absolute value of the angle of the phase advancing axial orientation or phase retarding axial orientation of the substrate film, measured relative to the short side orientation, is at least π/16 but not greater than 3π/16, the optical sheet has an optical layer laminated on one face of the substrate film, the optical layer comprising a construction selected from the group consisting of an optical layer comprising multiple particles of a light diffusing agent and a binder therefor and an optical layer comprising a shape having micro recessions an protrusions having refractivity, the retardation value of the substrate film is 140 nm or greater and 390 nm or less, wherein Re is defined as: Re=(ny−nx)/d, wherein nx is the refractive index in the x-direction, the x-direction being the direction of the base advancing axial orientation of the front face of the substrate film, ny is the refractive index in the y direction, the y direction being the direction of the phase retarding axial orientation of the front face of the substrate film, and d is the thickness of the substrate, with the proviso that nx≠ny.