Patent ID: 7126565

Claim:
A current signal output circuit for outputting a current signal in accordance with an inputted voltage signal comprising: a current signal control circuit, said current signal control circuit comprising: at least a first through a sixth switch, a first and a second capacitor element and a first and a second transistor; wherein a first terminal of the first switch is connected to a voltage signal line for providing the voltage signal, a second terminal of the first switch is connected to a first terminal of the first capacitor element, a second terminal of the first capacitor element is connected to a gate electrode of the first transistor, a first terminal and a second terminal of the third switch are respectively connected to the gate electrode and a second main electrode of the first transistor, a first main electrode of the first transistor is connected to a first power source, the second main electrode of the first transistor is connected to a first terminal of the fourth switch, a first terminal of the second switch is connected to the voltage signal line for providing the voltage signal and a second terminal of the second switch is connected to a first terminal of the second capacitor element, a second terminal of the second capacitor element is connected to a gate electrode of the second transistor, a first terminal and a second terminal of the fifth switch are respectively connected to a gate electrode and a second main electrode of the second transistor, a first main electrode of the second transistor is connected to the first power source, the second main electrode of the second transistor is connected to a first terminal of the sixth switch, second terminals of the fourth and the sixth switches are connected to each other to constitute a current signal output terminal for outputting the current signal, and control terminals of the first through the sixth switches are respectively connected to a first through a sixth control signal line.