an apparatus includes a circuit branch electrically connected to a voltage rail and including a light emitting device connected in series with a drain of a dual gate transistor , a switching transistor configured to apply a data voltage to a first gate of the dual gate transistor in response to a scan signal , a capacitor connected between the first gate of the dual gate transistor and the drain of the dual gate transistor , and a conductor for supplying a control voltage to a second gate of the dual gate transistor . a method of operating the circuit is also described .