A rectifier circuit is provided, which does not need a feedback function and prevents deterioration of a frequency characteristic, even if the rectifier circuit is configured with thin film transistors (TFTs). For example, the rectifier circuit is configured with an amplifier circuit, which compares an input signal with a voltage of a power source; a waveform shaping circuit for shaping a waveform of an output signal of the amplifier circuit; a resistor, which is connected to both an input terminal and output terminal; and a switching circuit, which is connected to both the output terminal and the power source, and is controlled by an output signal of the waveform shaping circuit. Then, either the input signal or the voltage of the power source is outputted in accordance with an operation of the switching circuit, so that the input signal is ideally rectified.