Patent ID: 8872737

Claim:
An organic light emitting device, comprising: a display panel comprising pixels, the pixels comprising driving transistors and organic light emitting elements; a driving unit to supply a driving signal to the display panel; a signal controller to control the driving unit; a signal modification unit to modify an input image signal based on modification information to generate a modified image signal; and a modification controller to generate and provide the modification information to the signal modification unit, wherein the signal modification unit comprises: a first modification unit to convert the input image signal into a first modified signal according to first modification information to compensate for deviation in output currents of the driving transistors so that the output currents are substantially uniform for a same input image signal; and a second modification unit to convert the first modified signal into the modified image signal according to second modification information to compensate for deviation in luminance of the organic light emitting elements so that luminance of the organic light emitting elements is substantially uniform for the first modified signal to make the output currents of the driving transistors substantially uniform for different pixels.