Patent ID: 7420322
Filing Date: 2008-09-02
Classification: G02B,G02F,H01J,H01L

Abstract:
1. A display device comprising: a flat display panel which includes a plurality of pixels that are arrayed in a matrix at an interval, and which includes an optically transparent material covering the pixels; and an optical sheet which imparts a front directivity to light emerging from the flat display panel, and which includes a plurality of prisms each having a bottom surface which receives light from the pixels and a top surface from which light emerges imparted with the front directivity, wherein the prisms are continuous with one another so that a light emerging position of the top surface has no flat portion and has a shape of a sharpness angle α; wherein a vertical height d from a given pixel to a corresponding light emerging position is set to satisfy where: n is a refractive index of an optical path from the pixel to the light emerging position; and p is a horizontal width from the pixel to the light emerging position.