Patent ID: 9330603
Filing Date: 2016-05-03
CPC Classification: G09G

Claim Text:
1. An organic light emitting diode (OLED) display device, comprising: a first transistor configured to supply a data voltage to a first node according to a scan signal; a second transistor connected between the first node and a second node, and configured to connect the first node and the second node to each other according to a first control signal; a driving transistor having a gate electrode connected to a third node, a source electrode connected to the first node, and a drain electrode connected to a fourth node; a capacitor connected between the second node and the third node, and configured to sense a threshold voltage of the driving transistor; a third transistor connected between the third node and the fourth node, and configured to connect the third node and the fourth node to each other according to a second control signal of low level voltage; a fourth transistor connected between the fourth node and a fifth node, and configured to connect the fourth node and the fifth node to each other according to the first control signal; an OLED connected to the fifth node; and a fifth transistor configured to supply the second control signal of low level voltage to the fifth node according to the second control signal of low level voltage, wherein the first transistor is maintained as turn-on state during an entire period in which both the second control signal of low level voltage is applied to the fifth node and the third and fourth nodes are connected to each other by turning on the third transistor, and the first control signal of high level is applied to the second transistor and the fourth transistor to charge the capacitor to sense the threshold voltage of the driving transistor.