Pixel circuit with organic light emitting diode

摘要

A pixel circuit with an organic light emitting diode (OLED) includes an OLED, a driving switch, an enabling switch, a compensation circuit, and a data switch. Through the compensation circuit, the data switch, and the control of a compensation voltage, a voltage at the control terminal of the driving switch of the pixel circuit is set according to a data voltage and the absolute value of a threshold voltage of the driving switch. Hence, the driving current determined by the driving switch relates to the data voltage.

主权项

1. A pixel circuit, comprising:
an organic light emitting diode (OLED) having a first terminal for receiving a first reference voltage, and a second terminal, the OLED being driven by a driving current; a driving switch having a first terminal for receiving a second reference voltage, a second terminal, and a control terminal; an enabling switch having a first terminal electrically connected to the second terminal of the driving switch, and a second terminal electrically connected to the second terminal of the OLED, for being turned off during a first time period in a duty cycle and being turned on during a second time period in the duty cycle; a compensation circuit having a first terminal for receiving the second reference voltage, a second terminal electrically connected to the second terminal of the driving switch, a third terminal electrically connected to the control terminal of the driving switch, a fourth terminal for receiving a compensation voltage, and a fifth terminal; and a data switch having a first terminal electrically connected to the fifth terminal of the compensation circuit, and a second terminal for receiving a data voltage, the data switch being turned on during a third time period in the duty cycle; wherein the compensation voltage is at a first voltage level during a fourth time period in the duty cycle and is at a second voltage level during the duty cycle except the fourth time period, the third time period partially overlaps the fourth time period, the third time period starts in the fourth time period, and the third time period and the fourth time period are in the first time period.