Low EMI multiplexed dual display

A mirror assembly having an electrically adjustable reflectivity, the mirror assembly providing for the simultaneous display of a vehicle heading and an external temperature, the mirror assembly comprising:

• a reflective device that includes a transmissive element and a reflective surface formed on the transmissive element;
• a dual display located behind the reflective surface of the reflective device, the dual display visually providing the vehicle heading and the external temperature through the reflective device;
• and
• a control circuit which provides for the variable attenuation of light through the transmissive element and controls the intensity and information displayed by the dual display, the control circuit alternately providing the vehicle heading and the external temperature to the dual display, the control circuit exhibiting an electromagnetic interference level less than about 41 dBuV/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz.