A grayscale voltage generator circuit that is less likely to be influenced by the offset voltage is provided. The grayscale voltage generator circuit is a semiconductor device that includes a D/A converter circuit, a first Gm amplifier, a second Gm amplifier, a current control circuit, an output buffer, and a selector circuit. The D/A converter circuit generates a first voltage and a second voltage from an upper bit of a digital signal. The current control circuit generates a first current from a lower bit of the digital signal and functions as a current source of the first Gm amplifier. The output buffer generates a third voltage from currents output from the first Gm amplifier and the second Gm amplifier. The third voltage is input to the second Gm amplifier. The selector circuit selects voltages that are to be input to the first Gm amplifier and the second Gm amplifier.