Patent ID: 7391485

Claim:
A dual LCD device, comprising: a liquid crystal panel having a liquid crystal layer interposed between a first substrate and a second substrate; first and second polarizing plates attached to opposing surfaces of the liquid crystal panel; a first front light unit having a first side attached to a front side of the liquid crystal panel; and a second front light unit having a first side attached to a rear side of the liquid crystal panel, wherein the first and second front light units are disposed at opposite sides of the liquid crystal panel, the first and second front light units overlap each other with the liquid crystal panel disposed therebetween, and the first and second front light units each have second sides opposite to the first sides having prismatic configurations, wherein the liquid crystal panel functions in a TN mode, such that the first front light unit is in an ON state and an image displayed on the rear side of the liquid crystal panel is in a black mode, and such that the first front light unit is in an OFF state and an image displayed on the rear side of the liquid crystal panel is in a white mode, and wherein the liquid crystal panel functions in a TN mode, such that the second front light unit is in an ON state and an image displayed on the front side of the liquid crystal panel is in a black mode, and the second front light unit is in an OFF state and an image displayed on the front side of the liquid crystal panel is in a white mode.