A method of displaying a three-dimensional image includes sequentially providing light to display blocks of a display panel in a scan direction of an image, providing light at a maximum luminance to a display block during a first period in which an image for a left-eye or a right-eye is displayed on the display block, providing the light at a luminance gradually decreasing from the maximum luminance to a preset luminance to the display block during a second period in which a transition image between the left-eye or the right-eye image and a black image is displayed on the display block, and blocking the light from the display block during a third period including a period in which the black image is displayed on the display block and prior to a period in which a left-eye or a right-eye image of a following frame is displayed on the display block.