Au Optronics Corporation

Ching-Kai Lo

Chien-Chung Huang

Hua-Gang Chang

Ya-Ling Chen

Man-Wen Shih

A shift register comprises a first switch, a second switch, a third switch, and a fourth switch. The first switch selectively conducts a first clock signal to a first output terminal as a first output signal based on a voltage level over the control terminal. The second switch selectively forces a voltage level of the first output signal to be equal to a voltage level of a second clock signal based on both of the second clock signal and a third clock signal inverted to the second clock signal. The third switch selectively defines a voltage over the control terminal to be a first voltage based on a first input signal. The fourth switch selectively forces the voltage level over the control terminal to be equal to the voltage level of the second clock signal based on both of the second clock signal and the third clock signal.

Shift register

A pixel circuit includes four transistors, two capacitors and a light emitting element. A gate of first transistor receives a scan signal and a source/drain thereof receives a display data. A terminal of first capacitor couples to another source/drain of first transistor. A gate and a source/drain of second transistor couple to another terminal of first capacitor; and another source/drain thereof receives a switch signal. A terminal of second capacitor receives a reset signal; and another terminal thereof couples to another terminal of first capacitor. A gate of third transistor couples to a terminal of first capacitor. A gate of fourth transistor receives an enable signal; a source/drain thereof couples to a first power supply voltage; and another source/drain thereof couples to one source/drain of third transistor. The anode and cathode of the light emitting element couple to one source/drain of third transistor and a second power supply voltage, respectively.

Growing community of inventors

Hsin-Chu, Taiwan

Ching-Kai Lo