A method of driving a display device capable of obtaining a luminance of constant level irrespective of temperature change is provided. A change in luminance of an EL element due to temperature change is prevented by controlling the luminance of the EL element with current instead of voltage. Specifically, a TFT for controlling the amount of current flowing into the EL element is operated in a saturation range. Then a current value I.sub.DS of the TFT is hardly changed by V.sub.DS but is determined solely by V.sub.GS. Accordingly, the amount of current flowing in the EL element is kept constant by setting V.sub.GS to such a value as to make the current value I.sub.DS constant. The luminance of the EL element is substantially in proportion to the amount of current flowing through the EL element, and a change in luminance of the EL element upon temperature change can thus be prevented.