A display driving device includes an output circuit that drives display elements. The output circuit includes a bias circuit, an amplifier stage and an output stage. The bias circuit generates bias signals that include constant-current-control signals of a first bias signal and a second bias signal of the same polarity. The first and second bias signals are short circuited by a vertical line in the bias circuit and the vertical line is shielded. The amplifier stage is formed in a first well and constant-current-controlled by the first bias signal to amplify an input display signal. The output stage is formed in a second well. The first and second wells are formed separately in a semiconductor substrate. The output stage is constant-current-controlled by the second bias signal and supplies an output signal of the amplifier stage to the display element.