Stereoscopic video display device for 2D / 3D video compatibility using a polarizing grating screen

摘要

A stereoscopic display for switching between two-dimensional (2D) and three-dimensional (3D) images. The stereoscopic display includes a display device (10) providing an image and a parallax barrier unit (11, 12, 13, 14) that transmits all incident light in a 2D mode and forms barriers to separate an image for a left eye from an image for a right eye in a 3D mode by moving two facing polarization grating screens (11, 12) relative to each other. The polarization grating screens have a grating pattern such that two kinds of birefringence elements (11a, 11b, 12a, 12b) changing the directions of polarization of incident light into different directions are alternately disposed horizontally and vertically, and each row of the birefringence elements is shifted with respect to a previous row by a predetermined horizontal distance.