Charge storage circuit for a pixel, and a display

摘要

A charge storage circuit for a pixel comprises a charge storage node. First and second series-connected transistors (8,10) are provided for selectively isolating the charge storage node from a first voltage input (9,SL) for supplying a data voltage. The circuit is provided with a voltage follower circuit for replicating a voltage at the charge storage node (12) at another node in the circuit thereby to reduce the drain-source voltage across the second transistor (10). The first transistor forms part of the voltage follower circuit.

主权项

1. A charge storage circuit for a pixel, the circuit comprising:
a charge storage node; first and second transistors for selectively isolating the charge storage node from a first voltage input for supplying a data voltage, the first and second transistors being series-connected; a voltage follower circuit for replicating a voltage at the charge storage node at another node in the circuit thereby to reduce the drain-source voltage across the second transistor; and a third transistor connected between (i) a second voltage input and (ii) a first node between the first transistor and the second transistor, a gate of the third transistor being connected to the charge storage node, the voltage follower circuit comprising the first transistor and the third transistor, where in a voltage holding mode the first transistor and the third transistor pass the same current.