Patent ID: 8451208

Claim:
An organic light emitting display device, comprising: a plurality of scan lines; a plurality of data lines; a pixel unit including a plurality of pixels, each pixel connected to the scan lines and the data lines; and a drive circuit unit configured to receive a first synchronizing signal having a first frequency, and to supply a scan signal and a data signal to the scan lines and the data lines, respectively, wherein the scan signal and the data signal are supplied at a frequency determined by the frequency of the received synchronizing signal, and wherein the data signal is supplied to the pixels only for a duration, wherein the drive circuit unit is further configured to receive a second synchronizing signal having a second frequency different from the first frequency, and to supply a scan signal and a data signal to the scan lines and the data lines, respectively, wherein the scan signal and the data signal are supplied at a frequency determined by the frequency of the second synchronizing signal, and wherein the data signal is supplied to the pixels only for the duration which remains constant regardless of the first and second frequencies.