Organic light emitting diode display device and method of driving the same

A method of driving an organic light emitting display device, the method comprising:

• converting red, green, and blue (RGB) data signals into red, green, blue, and white (RGBW) data signals;
• calculating an average picture level (APL) for the RGB data signals;
• generating data signals, such that a data signal selected from among the RGB signals is supplied in a display panel in response to color coordinates of the white (W) data signal among the RGBW data signals being different from a target value;
• and
• calculating gain by:
• multiplying an arithmetical value, obtained by performing an arithmetical operation on a current APL and a maximum APL, with a 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;
• and
• adding the gain of the RGB data signals corresponding to the target peak luminance APL to the result value of the multiplication to calculate respective correction gain values of the RGB data signals,
• wherein the correction gain values are calculated 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.

An organic light emitting display device, comprising:

• a display panel comprising red, green, blue, and white (RGBW) subpixels;
• a scan driver and a data driver configured to drive scan lines and data lines of the display panel, respectively;
• a timing controller configured to control the scan driver and the data driver;
• a data extraction unit configured to:
• determine a representative value of every pixel in one frame data supplied externally from the device;
• and
• average the representative values over all of the pixels;
• an average picture level (APL) calculation unit configured to calculate an APL by performing an arithmetical operation on the averaged representative values extracted from the data extraction unit;
• and
• a peak luminance controller (PLC) configured to control luminance of each of at least one frame by using the APL calculated by the APL calculation unit and a look-up table,
• wherein the controlling luminance includes calculating a correction gain value of at least one RGB data signal, 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,
• wherein:
• 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.

A method of driving an organic light emitting display device, the method comprising:

• determining a representative value for each respective pixel, such that a subpixel value comprising a greatest data value among red, green, and blue (RGB) subpixels in a single pixel is determined as a representative value for the single pixel;
• subsequently averaging the representative values over all of the pixels;
• calculating an average picture level (APL) by performing an arithmetical operation on the averaged representative values;
• and
• controlling luminance of each of at least one frame by using the calculated APL and a look-up table,
• wherein the controlling luminance includes calculating a correction gain value of at least one RGB data signal, 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,
• wherein:
• 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.