A current signal output circuit includes a first switch, a first capacitor element and a first transistor in which a first terminal of the first switch is connected to a voltage signal line for providing a 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 transistors, and a first main electrode of the first transistor is connected to a first power source.

 
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