Patent ID: 8760386

Claim:
A display device comprising: a histogram generation/analysis unit for analyzing image data supplied thereto from an outside frame by frame, generating a histogram of the image data included in each of the frames, and analyzing the histograms; a gamma reference voltage generating unit for generating a plurality of gamma reference voltages and adjusting magnitude of the gamma reference voltages according to a result of analysis from the histogram generation/analysis unit and forwarding the adjusted gamma reference voltages; a timing controller for re-arranging the image data supplied thereto from an outside, controlling output timings of the re-arranged image data and forwarding the re-arranged image data; and a data driver for generating a plurality of gamma gradient voltages by using the plurality of gamma reference voltages from the gamma reference voltage generating unit, converting the re-arranged image data from the timing controller into analog image signals by using the gamma gradient voltages and supplying the analog image signals to a display panel, wherein the histogram generation/analysis unit includes: a brightness extraction unit for extracting brightness components of the re-arranged image data of one frame, a histogram generating unit for classifying the brightness components of the re-arranged image data of one frame from the brightness extraction unit by gradients and calculating a frequency of each of the gradients to generate a histogram thereof, and a histogram analyzing unit for analyzing the histogram from the histogram generating unit to determine an average gradient of all gradients in one frame, a number of peak regions including gradients which exceed a preset frequency, an average peak gradient of each of the peak gradients formed at each of the peak regions, and a degree of distribution representing a width of each of the peak regions.