Optical film and liquid-crystal display device

Abstract

An optical film is constituted by a transparent film with a refractive index of not lower than 1.49. The transparent film including light exit means which are constituted by concave or convex portions and which are arranged partially like pits in one of opposite surfaces of the transparent film so as to face at least one virtual center formed in one place located on or outside a layer thickness surface at an end of the transparent film, each concave or convex portion having a length of not larger than 200 μm and a depth or height of not larger than 50 μm, each of the light exit means having an optical path changing slope inclined to the film surface of the transparent film at an inclination angle in a range of from 35 to 48 degrees, and an elevational face inclined to the film surface at an inclination angle of not lower than 50 degrees. A liquid-crystal display device is constituted by a liquid-crystal display panel and the optical film, the optical film being disposed on one of opposite surfaces of the liquid-crystal display panel so that a surface of the optical film in which the light exit means are provided is located outward.

Dependencies are inferred from the claim text.