A 3D image display includes a display panel operated in 2D and 3D driving modes and a barrier panel turned off in the 2D driving mode and turned on in the 3D driving mode to separate an image output from the display panel to left and right-eye images. The barrier panel includes a reference electrode, first barrier electrodes arranged in a first direction, second barrier electrodes alternately arranged with the first barrier electrodes along the first direction, and a liquid crystal layer interposed between the reference electrode and the first and second barrier electrodes. Each first barrier electrode includes first electrode pieces arranged in a zigzag fashion along a second direction different from the first direction, and each second barrier electrode includes second electrode pieces arranged in the zigzag fashion.