DIRECTIONAL BACKLIGHT UNIT, THREE-DIMENSIONAL (3D) IMAGE DISPLAY APPARATUS, AND 3D IMAGE DISPLAYING METHOD

摘要

A directional backlight unit, a three-dimensional (3D) image display apparatus, and a 3D image displaying method are provided. The directional backlight unit includes a light guide plate having an emission surface on which a plurality of grating elements including first and second groups of grating elements are provided. The plurality of grating elements are arranged such that light beams emitted from the first and second groups of grating elements commonly propagate through a plurality of pixel points and respectively form first and second groups of view points of which corresponding regions do not overlap with each other.