A display device includes a voltage drop amount calculating circuit that regulates a power source voltage, a power wire network in the organic EL display unit includes a row-wise resistance component Rah and a column-wise resistance component Rav, and the voltage drop amount calculating circuit divides the organic EL display unit into blocks each made up of pixels in Xv rows and Xh columns, and sets, for each of the blocks, a row-wise resistance component Rah′ to a value obtained by multiplying the resistance component Rah by (Xh/Xv), and sets, for each of the blocks, a column-wise resistance component Rav′ to a value obtained by multiplying the resistance component Rav by (Xv/Xh), thereby estimating a distribution, for the respective blocks, of amounts of voltage drop which occurs in the power wire, and regulates, based on the distribution, a voltage to be supplied to the display unit.