Patent ID: 8860906
Filing Date: 2014-10-14
Classification: G02B

Abstract:
1. A directional light guide plate for a two-dimensional (2D)/three-dimensional (3D) switchable directional surface light source, the directional light guide plate comprising: a light guide unit comprising first and second incident surfaces respectively formed on first and second side surfaces on substantially opposing sides of the light guide unit, configured to guide light incident on the first and second incident surfaces via total internal reflection inside the light guide unit; and viewing zone separation units formed of a substantially transparent material having a refractive index greater than that of the light guide unit, each of the viewing zone separation units being aligned in parallel with each other and disposed in a flat third surface of the light guide unit, wherein each of the viewing zone separation units comprises: wherein the first and second interfaces are formed so that light incident on the first incident surface and light incident on the second incident surface are separated into different viewing zones, wherein the directional light guide plate and a light source unit form the two-dimensional (2D)/three-dimensional (3D) switchable directional surface light source, and wherein each of the viewing zone separation units is formed in a shape in which a first inclination angle between the first interface and the exit surface differs according to a distance from the first incident surface and a distance from the second incident surface, and a second inclination angle between the second interface and the exit surface differs according to the distance from the first incident surface and the distance from the second incident surface.