Patent ID: 7880697

Claim:
An organic light-emitting diode (OLED) display device, comprising: an OLED display panel comprising a plurality of pixels to display a plurality of colors, respectively, each pixel comprising an OLED element; a gamma voltage-generating section to generate a reference gamma voltage based on a gamma curve in which the lowest gradation of all gradations is mapped as a negative data voltage with respect to a reference voltage; a data conversion section to convert a first data signal into a second data signal that includes data corresponding to the lowest gradation; and a source drive section to convert the second data signal into a third data signal by using the reference gamma voltage and to provide the third data signal to the OLED display panel, wherein the first data signal comprises first red data, first green data, and first blue data, wherein the second data signal comprises second red data, second green data, second blue data, and white data, and wherein the data conversion section comprises: a first arrangement part to arrange the first red data, the first green data, and the first blue data in the order of a gradation size; a first conversion part to convert each of the first red data, the first green data, and the first blue data into first luminance data, second luminance data, and third luminance data, respectively; a processing part to extract maximum luminance data, medium luminance data, minimum luminance data, and white luminance data by processing the first to third luminance data: a second conversion part to convert each of the maximum luminance data, the medium luminance data, the minimum luminance data, and the white luminance data into maximum data, medium data, minimum data, and white data, respectively; and a second arrangement part to arrange the maximum data, the medium data, the minimum data, and the white data as the second data signal and to output the second data signal to the source drive section.