Patent ID: 8797311

Claim:
An organic light emitting display device comprising: a plurality of pixels, each of the pixels comprising: an organic light emitting diode; and a pixel circuit comprising a driving transistor for driving the organic light emitting diode and a switching transistor for switching a current flowing through the driving transistor in response to a sensing signal; and a sensing circuit for sensing the current, converting the current into sensing data, and performing mura correction and image compensation for image sticking based on the sensing data and a lookup table, wherein the lookup table is generated by comparing the sensing data with previously sensed sensing data, wherein the sensing circuit comprises: an analog-digital converting circuit for converting the current into the sensing data; a mura correction circuit for comparing the sensing data with original data provided from the pixel circuit to generate mura correction data; and an image compensating circuit for generating image compensation data to compensate for image sticking in accordance with the mura correction data and the lookup table wherein the sensing circuit further comprises a current source configured to provide a constant current at a front end of the analog-digital converting circuit.