Patent ID: 9208725
Filing Date: 2015-12-08
Classification: G09G

Abstract:
1. A display device, comprising: a pixel array, comprising a plurality of pixel elements, wherein at least one of the pixel elements comprises: an OLED; a first transistor, comprising a first terminal coupled to an anode of the OLED for driving the OLED; a second transistor, coupled between a second terminal of the first transistor and a reset voltage and comprising a control terminal receiving a reset signal; a third transistor, coupled between the anode of the OLED and a control terminal of the first transistor and comprising a control terminal receiving a compensation signal; a first capacitor, coupled between the control terminal of the first transistor and the anode of the OLED; a second capacitor, coupled to the first capacitor and the control terminal of the first transistor, a fourth transistor, coupled between the second capacitor and a data line and comprising a control terminal receiving a scan signal, and a fifth transistor, coupled between the first transistor and an operating voltage and comprising a control terminal for receiving a switch signal, wherein the first capacitor, the second capacitor and the first transistor are coupled at a first node, the first transistor and the OLED are coupled at a second node, the second capacitor and the fourth transistor are coupled at a third node and the first transistor and the second transistor are coupled at a fourth node, wherein during a third operating phase, the fifth transistor is turned on, such that a voltage at the fourth node is set to a voltage level which is close to the operating voltage, the first transistor is turned on and the OLED emits light, such that a voltage at the second node is set to a driving voltage of the OLED, and a voltage at the first node is set to the data voltage plus a threshold voltage of a transistor further plus the voltage at the second node and minus the reset voltage via the first capacitor.