A context sensitive data announcing device includes an ad hoc network interface configured to receive one or more announcements identifying one or more members of an ad hoc network. The amount of overdrive and the phase of the light relative to the overdriving of the pixel circuit are controlled such that the modulated light has a predetermined level of uniformity. In the third deposition chamber, the fourth deposition source is placed nearest to the second deposition source. Discharge energy is passed from the discharge capacitor to a flashlamp through a discharge bank without passing through any inductive elements. The first and second switches are switched in accordance with the format of the input video signal respectively, thereby properly selecting the anode voltage which is applied to the CRT and the cut-off voltage.