Patent ID: 8405579

Claim:
A light emitting diode display device comprising: a display region having a scan line, a data line, a line having a feedback function, and a pixel coupled to the scan line, the data line, and the line having a feedback function, the pixel comprising a light emitting device; a scan driver for supplying scan signals to the scan line in sequence; and a data driver coupled to the data line and to the line having a feedback function for supplying a data voltage as a data signal to the data line, the data driver including: a voltage digital-analog converter for generating the data voltage corresponding to a data received by the data driver from an external source; a current digital-analog converter for generating a sensing current corresponding to the data; and a voltage control block: for selectively supplying the data voltage to a first capacitor, for receiving a pixel current supplied by a driving transistor in the pixel, the pixel current corresponding to the data voltage being supplied to a gate electrode of the driving transistor of the pixel, wherein the pixel is configured to selectively feed back the pixel current from the pixel to the voltage control block in response to an on-signal of a first scan signal of the scan signals and supply the pixel current to the light emitting device in response to an on-signal of a second scan signal of the scan signals, the on-signals of the first and second scan signals never being overlapped in time, in accordance with the scan signals, for increasing or decreasing a current charging the first capacitor based on the pixel current, and for controlling the data voltage being supplied to the pixel based on a voltage being charged in the first capacitor, the voltage being charged in the first capacitor being varied corresponding to the current charging the first capacitor, and for comparing the pixel current with the sensing current to generate a control signal for controlling the current charging the first capacitor, the control signal having a width that varies according to a difference between the pixel current and the sensing current, wherein the pixel further comprises: a first transistor having a gate, the first transistor receiving a third power corresponding to a voltage applied to the gate and allowing a pixel current to flow through the first transistor; a second transistor selectively receiving the pixel current in response to the first scan signal and supplying the received pixel current to a comparator; a third transistor selectively supplying the pixel current to the light emitting device in response to the second scan signal; a fourth transistor selectively supplying the data voltage to the gate of the first transistor in response to the first scan signal; and a second capacitor for maintaining a voltage applied to the gate of the first transistor during a predetermined period.