Patent ID: 7365594

Claim:
A current driver which has a first mode and a second mode, the current driver comprising: a current supply section; a first input terminal; a bias voltage generation section for generating a bias voltage; a first gate line receiving the bias voltage generated by the bias voltage generation section; and, K driving transistors each being connected between an output node from which an output current is output and a first reference node indicating a first voltage value, where K is a natural number, respective gates of the K driving transistors are connected to the first gate line; wherein in the first mode, the current supply section supplies a first current, and the bias voltage generation section generates the bias voltage according to the first current supplied from the current supply section, wherein in the second mode, the first input terminal receives a current from the outside of the current driver, and the bias voltage generation section generates the bias voltage according to the current supplied to the first input terminal, and wherein in the bias voltage generation section, the relationship, which is also referred to as current-voltage conversion capability, between a current value of a current received by the bias voltage generation section and the voltage value of the bias voltage generated by the bias voltage generation section is adjusted, according to a current value of the output current flowing in a first driving transistor of the K driving transistors, in the first mode, and the current-voltage conversion capability is adjusted, according to a current value of an output current flowing in a second driving transistor of the K driving transistors, in the second mode.