A 3-dimensional image display device according to an exemplary embodiment includes: a display panel including a plurality of pixels; a light source unit including a first color light source for supplying a first color light and a second color light source for supplying a second color light to the display panel; and a data driver sequentially applying a first left-eye data voltage, a second left-eye data voltage, a first gray data voltage, a first right-eye data voltage, and a second right-eye data voltage to a pixel, wherein the light source unit supplies the first color light when the first left-eye data voltage and the second right-eye data voltage are applied, the second color light when the second left-eye data voltage and the first right-eye data voltage are applied, and the light source supplies the second color light at a first intensity when the first gray data voltage is applied.