Patent ID: 8400484

Claim:
A device comprising: a first element substrate configured to drive a driving element; a second element substrate configured to drive a driving element; a first signal input unit that is connected to an input terminal of the first element substrate via a first signal line; a second signal input unit that is connected to an input terminal of the second element substrate via a second signal line; and a signal output unit through which an output terminal of the first element substrate and an output terminal of the second element substrate are connected in parallel, wherein each of the first element substrate and the second element substrate includes a driving element, a first signal generation unit configured to output a first signal, a second signal generation unit configured to output a second signal, an input terminal, an output terminal, and a selection unit configured to receive a signal from the first signal generation unit and the second signal generation unit, select one of a state of the first signal, a state of the second signal, and a high-impedance state on the basis of the selection signal input from the input terminal, and output the state to the output terminal.