Patent ID: 8842171

Claim:
A stereoscopic image display device comprising: a display device that displays left-eye image data in a left-eye frame and right-eye image data in a right-eye frame; liquid crystal shutter glasses that alternately open and close a left-eye shutter and a right-eye shutter in synchronization with the display device; a control circuit that controls the ON duty ratio of a backlight of the display device to a first set value if the luminance of each of the left-eye and right-eye frames is less than a predetermined reference value, and controls the ON duty ratio of the backlight of the display device to a second set value if the luminance of each of the left-eye and right-eye frames is greater than the reference value; wherein the left-eye frame comprises (n+1)th and (n+2)th frames displaying the same left-eye image data, and the right-eye frame comprises (n+3)th and (n+4)th frames displaying the same right-eye image data; and the backlight of the display device is turned on in the (n+2)th and (n+4)th frames.