Patent ID: 8547309

Claim:
An organic light emitting diode display, comprising: a display panel where a plurality of R, G, and B pixels are formed at crossing points of a plurality of data lines and a plurality of gate lines and at least one of a high-potential driving voltage supply line and a low-potential driving voltage supply line is disposed divided for R, G, and B; a data driving circuit for converting input RGB data into data voltages with reference to gamma reference voltages and then supplying the data voltages to the data lines; a gamma reference voltage generating circuit for generating the gamma reference voltages for R, G, and B by dividing voltages of high-potential gamma power sources for R, G, and B; a current estimating circuit for generating digital estimated current values for R, G, and B in a corresponding frame by using the input RGB data for one frame; a current sensing circuit for generating digital sensing current values for R, G, and B in the corresponding frame by using driving currents for R, G, and B fed back from the divided driving voltage supply lines; and a gamma power source control circuit for generating digital luminance control values for R, G, and B by comparing the digital estimated current values for R, G, and B with the digital sensing current values for R, G, and B, and controlling the output level of the high-potential gamma power sources for R, G, and B by digital-to-analog converting the digital luminance control values for R, G, and B, wherein the gamma power source control circuit includes an R comparator for comparing an R digital estimated current value with an R digital sensing value to generate an R digital luminance control value, and wherein the R digital luminance control value is generated as a digital value which lowers the output level of the R high-potential gamma power source in case the R digital sensing current value is larger than the R digital estimated current value, or the R digital luminance control value is generated as a digital value which raises the output level of the R high-potential gamma power source in case the R digital sensing current value is smaller than the R digital estimated current value.