Patent ID: 8576157

Claim:
A low-power image display device, comprising: a brightness determining unit configured to determine a brightness of image data applied from outside; a histogram analyzing unit that is connected to the brightness determining unit, the histogram analyzing unit being configured to: calculate a cumulative distribution function (CDF) of the applied image data through the determined brightness; and determine a reference brightness of the applied image data based on the calculated CDF, wherein the reference brightness is selected to be a brightness that corresponds to a calculated CDF value of a predetermined number of pixels; a brightness control unit that is connected to the brightness determining unit and the histogram analyzing unit, the brightness control unit being configured to use the applied image data in converting a contrast of the applied image data into contrast corresponding to the reference brightness; a data drive that is connected to the brightness control unit, the data drive being configured to: receive the converted applied image data of which the contrast is changed; and convert the received applied image data into an image output signal to display an image to the outside; a backlight control unit connected to the histogram analyzing unit and the data drive and driven by a synchronization signal applied from the data drive, the backlight control unit being configured to: generate a driving voltage to control a brightness of backlight to a brightness corresponding to the reference brightness; and output the generated driving voltage in synchronization with an outputting of the image output signal by the data drive according to the synchronization signal; an image display unit that is connected to the data drive and the backlight control unit, the image display unit being configured to: receive the generated driving voltage from the backlight control unit and the image output signal; and display an image by using: the image output signal, of which the contrast is changed; and the generated driving voltage to control the brightness of the backlight.