Patent ID: 8780294

Claim:
A display device, comprising: a liquid crystal display panel that varies a phase of polarized light via liquid crystal molecules, and having first and second polarizing plates respectively disposed on opposite sides of the liquid crystal display panel; a first light guide plate including an upper surface and a bottom surface, the bottom surface having a plurality of first recessed patterns and first flat surfaces disposed between the first recessed patterns, to reflect light input through a side surface of the first light guide plate, and to output two-dimensional light towards the liquid crystal display panel; and a second light guide plate including an upper surface and a bottom surface, the upper surface of the second light guide plate having a plurality of second recessed patterns and second flat surfaces disposed between the second recessed patterns, wherein the second recessed patterns of the second light guide plate are directly faced with the first recessed patterns of the first light guide plate to form a first empty space, and wherein the first flat surfaces of the first light guide plate are directly faced with the second flat surfaces of the second light guide plate to form a second empty space narrower than the first empty space.