An organic light emitting diode display comprises a display panel, a data operation unit, a gain adjusting unit, and a data conversion unit. The display panel comprises an R sub-pixel, a G sub-pixel, a B sub-pixel, and a W sub-pixel. The data operation unit generates a data operation value. The gain adjusting unit generates a gain adjusting value of the three primary color data. The data conversion unit generates four color compensation data, whose white chromaticity coordinates are compensated for each pixel.