Abstract: A buffer circuit has a first transistor and a second transistor in a cascode, and a buffer switch coupled from an output of the buffer to a gate of the second transistor. The buffer circuit is bootstrapped by a bootstrap capacitor, a diode circuit, and a bootstrap switch. The bootstrap capacitor is coupled from the output to the gate of the second transistor through the bootstrap switch. A potential difference is set up across the bootstrap capacitor through the diode circuit. When a low input is given to the buffer circuit, the second transistor turns off and the output goes to a high bias voltage through the first transistor. When a high input is given, the first transistor turns off, the second transistor turns on, and as the output goes low, the gate of the second transistor is bootstrapped to drop the output completely down to a low bias voltage.

Abstract: An image display system comprises a pixel driving circuit. A storage capacitor is coupled between the first and second nodes. The first switch is turned on in the first and second periods. The second switch, coupled to the first node, is turned on in the first and second periods. The third switch, coupled between the second node and the first switch, is turned on in the first, third and fourth periods. The fourth switch, coupled between the second switch and the first voltage, is turned on in the first, third and fourth periods. The fifth switch, coupled between the second node and the first voltage, is turned on in the first, second and third periods. The sixth switch, coupled between the first node and the reference voltage, is turned on in the fourth period. The first transistor is coupled between the first and second switches and is turned on in the fourth period. During the second period, the voltage between source and gate of the first transistor is a threshold voltage.

Abstract: A pixel driving circuit with threshold voltage and power supply voltage compensation. The pixel circuit includes a storage capacitor, a transistor, a transfer circuit, a driving element, and a switching circuit. The transistor has a gate coupled to a discharge signal and is coupled between a first node and a second node. The discharge signal directs the transistor to turn on and then discharges the storage capacitor in a first period. The transfer circuit transfers a data signal or a reference signal to a first node of the storage capacitor. The driving element has a first terminal coupled to a first voltage, a second terminal coupled to a second node of the storage capacitor and a third terminal outputting a driving current. The switching circuit is coupled between the driving element and a display element. The switching circuit can be controlled to diode-connect the driving element in a second period, allowing the driving current to be output to the display element in a third time period.