Patent ID: 8896641

Claim:
An organic light emitting display device, comprising: a display panel comprising red, green, blue, and white (RGBW) subpixels; a first data conversion unit configured to convert red, green, and blue (RGB) data signals into RGBW data signals; an average picture level calculation unit configured to calculate an average picture level (APL) for the RGB data signals; a peak luminance controller configured to control luminance of at least one frame by using the APL and a look-up table; and a data compensation unit configured to: perform a compensation operation on at least one of the RGB data signals in response to color coordinates of white (W) data signals among the RGBW data signals output from the first data conversion unit being different from a target value; multiply an arithmetical value, obtained by performing an arithmetical operation on a current APL and a maximum APL, with a difference value corresponding to a difference between a gain of the RGB data signals corresponding to the maximum APL and a gain of the RGB signals corresponding to a target peak luminance APL; add the gain of the RGB data signals corresponding to the target peak luminance APL to a result value of the multiplication to calculate correction gain values for the RGB data signals; and calculate the correction gain value of at least one of the RGB data signals, based on a gain calculated in accordance with the following equation: Current gain of data signal selected from among the RGB data signals=(Max APL RGB gain−Target Peak Lum APL RGB gain)*{(Current APL−Target Peak Lum APL)/(Max APL−Target Peak Lum APL)}+Target Peak Lum APL RGB gain+RGB gain weight, where: Max APL RGB gain is an actual gain measurement value of the selected RGB data signal corresponding to the maximum APL, Target Peak Lum APL RGB gain is an actual gain measurement value of the selected RGB data signal corresponding to the target peak luminance APL, Current APL is a current APL, Max APL is a maximum APL, Target Peak Lum APL is a target peak luminance APL, and RGB gain weight is a gain weight of the selected RGB data signal.