A three dimensional image display device includes a liquid crystal display panel assembly which includes a first pixel and a second pixel disposed adjacent to each other in a vertical direction. The first pixel comprises a first subpixel and a second subpixel disposed adjacent to each other in the vertical direction, and the second pixel includes a third subpixel and a fourth subpixel which are disposed adjacent to each other in the vertical direction. The first subpixel and the third subpixel, or the second subpixel and the fourth subpixel display black in a three dimensional (3D) display mode and display a normal image in a two dimensional (2D) display mode.