Display apparatus with adjusted power supply voltage

摘要

A display apparatus includes an organic light emitting diode (OLED) which serves as an optical element, a first transistor which serves as a switch for writing luminance data and a second transistor which drives the OLED. A cathode of the OLED is connected to a constant voltage, and a source electrode of the second transistor is connected to a power supply voltage via a power supply line. Potential of the constant voltage is set to a negative value whereas potential of the power supply voltage is set to a positive value. Thus, the difference between the absolute values of the constant voltage and the power supply voltage becomes small compared to a case where the constant voltage is set to 0 V.