A phased array antenna is provided having a plurality of phase shifter devices for phase shifting and beam steering a radiated beam of the phased array antenna. The pixel includes an organic light emitting diode and an inverse voltage transistor positioned between an anode of the organic light emitting diode and a reverse bias power source, and configured to transmit the inverse voltage to the organic light emitting diode. The diaphragm spring is installed so that it is operatively associated with the pressure plate in an elastically stressed condition.