Patent ID: 7224334

Claim:
An apparatus for providing a driving signal to an organic light emitting diode in an image display device, comprising: first and second control lines for transferring previous and current control signals, respectively, in a sequential process for providing the driving signal to the organic light emitting diode; a data line for transferring a data signal for displaying images on the image display device; a first switching device including a conduction path for transferring the data signal from the data line, the conduction path of the first switching device being controlled by the current control signal from the second control line; a second switching device including a conduction path for transferring a reference signal externally supplied, the conduction path of the second switching device being controlled by the previous control signal from the first control line; a third switching device including a conduction path for transferring the data signal provided from the first switching device, the conduction path of the third switching device being controlled by a state of the second switching device; a fourth switching device including a conduction path for transferring a bias voltage, the conduction path of the fourth switching device being controlled by one of the reference signal from the second switching device and the data signal from the third switching device; and a fifth switching device including a conduction path for receiving a bias voltage from the fourth switching device and generating the driving signal to the organic light emitting diode, the conduction path being controlled by the previous gate signal from the first gate line.