A liquid crystal display device and a method of driving the same are provided for one or more embodiments. The liquid crystal display device includes: a liquid crystal panel including a plurality of display blocks and displaying an image in response to image signals; a plurality of light-emitting blocks emitting light to the liquid crystal panel and corresponding to the plurality of display blocks; a first look-up table including a normalized value obtained by normalizing an initial duty ratio corresponding to the brightness of the image to a maximum duty ratio corresponding to the maximum brightness of the image; and a timing controller receiving the normalized value corresponding to each of the light-emitting blocks from the first look-up table and using the normalized value to provide an optical data signal corresponding to each of the light-emitting blocks.