Patent ID: 8358080

Claim:
A light emitting element driving circuit for driving a light emitting element in accordance with a differential data signal for causing the light emitting element to turn on or turn off, comprising: a first transistor; a first constant current source connected to a drain and gate of the first transistor and configured to supply a constant current through the drain and source of the first transistor; a second transistor configured to supply a current relative to the constant current to the light emitting element; and a control circuit configured to electrically connect or disconnect the gate of the first transistor to or from a gate of the second transistor via a first resistor in accordance with one of the differential data signals, wherein the control circuit includes a potential supply unit configured to supply, to the gate of the second transistor, an intermediate potential between a potential that completely turns on the second transistor and a potential that completely turns off the second transistor in accordance with the other of the differential data signals, while the gate of the first transistor is electrically disconnected from the gate of the second transistor.