Patent ID: 7292210

Claim:
A circuit, for driving a flat panel display, for receiving a data of a current source, a first signal and a second signal and outputting a current via a current output terminal, the circuit comprises: a storage capacitor, having a first terminal and a second terminal, the first terminal being coupled to a system voltage, the second terminal being coupled to a storage voltage; a transmission gate, comprising a first N-type transistor and a first P-type transistor, a first source/drain terminal of the first N-type transistor being coupled to a first source/drain terminal of the first P-type transistor serving as a first input/output terminal of the transmission gate, a second source/drain terminal of the first N-type transistor being coupled to a second source/drain terminal of the first P-type transistor serving as a second input/output terminal of the transmission gate, a gate terminal of the first N-type transistor being a first gate terminal of the transmission gate, a gate terminal of the first P-type transistor being a second gate terminal of the transmission gate, the first input/output terminal of the transmission gate being coupled to the storage voltage, the second input/output terminal of the transmission gate being coupled to the data current source, the first gate terminal of the transmission gate being coupled to the first signal, the second gate terminal of the transmission gate being coupled to the second signal; and a current-limiting transistor, wherein a gate terminal of the current-limiting transistor is coupled to the storage voltage, a first source/drain terminal of the current-limiting transistor is coupled to the system voltage, a second source/drain terminal of the current-limiting transistor is coupled to the current output terminal for determining current flow from the current-limiting transistor according to the storage voltage.