Patent ID: 7333158

Claim:
A three-dimensional (3D) display system, comprising: a liquid crystal display panel having a liquid crystal layer; and a directional backlight module, disposed behind the liquid crystal display panel, comprising: a light-guide plate having a light-guiding surface opposite to the liquid crystal display panel; a focusing layer, disposed between the light-guide plate and the liquid crystal display panel, having a focusing surface opposite to the light-guiding surface; a left backlight source and a right backlight source respectively disposed on two sides of the light-guide plate, the left/right backlight source being instantly switched to alternately emit light from the two sides of the light-guide plate; a first V-shaped micro-grooved structure, disposed on the light-guiding, surface, for directing the light emitted from the left/right backlight source to be transmitted from the light-guiding surface at a substantially large angle; and a second V-shaped micro-grooved structure, disposed on the focusing surface, for directing the light guided by the light-guide plate to be transmitted from the focusing layer within a particular range of angles; whereby the light focused by the focusing layer passes through the liquid crystal layer for being alternately projected to form a 3D image.