| 摘要 |
A source driver according to the present invention is comprised of a bias circuit 2 and an output circuit 2. In the output circuit 21, a differential unit 21 amplifies the difference between two input signals received through input terminals. An output unit made up of the transistors, and a capacitor, receives a signal from the differential unit, amplifies it, outputting it to a liquid crystal display (not shown) via a variable-resistance unit with analog switches. A selection circuit causes each of the analog switches to be activated or deactivated. A bias current circuit changes a current flowing through a differential amplification circuit made up of the transistors. A bias current changing circuit changes a bias current flowing through a circuit made up of a transistor. A bias circuit receives an external voltage, exerting a control of the bias current flowing through respective bias current changing circuits. A bias voltage selection circuit changes a bias voltage output from the bias unit, and then sends it to the bias current changing circuits.
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