A stereoscopic image display includes a display panel, an active black stripe controller, which analyzes an information of a 3D depth between left eye image data and right eye image data, obtains a 3D depth value, compares the 3D depth value with a predetermined threshold value, and assigns data copied from the left eye image data and the right eye image data as data to be written to second division subpixels of pixels of the display panel when the 3D depth value is equal to or less than the predetermined threshold value, a data driving circuit which converts digital data received from the active black stripe controller into a data voltage and supplies the data voltage to data lines of the display panel, and a gate driving circuit sequentially supplying a gate pulse to gate lines of the display panel.