Abstract: The present invention includes a smart controller for electroluminescent lamps which compensates for a range of RC time constants and adjusts its output frequency accordingly such that a relatively uniform light output is obtained on all illuminated areas of large EL display panels. The controller incorporates a device which monitors the current as the pulse train is applied to the EL panel. A sensing circuit determines if the current decayed to zero during the positive portion of the pulse. If the current did not decay to zero, the frequency is decreased until a decay to zero is sensed. Uniform light output is thus maintained from panel to panel, regardless of RC time constant differences between different EL panels, or variations in panel electrical characteristics over time. In an alternate embodiment of the present invention, several different frequencies are applied to the EL panel nearly simultaneously.

Abstract: Signs including electroluminescent lamps are described. In accordance with one embodiment of the present invention the electroluminescent system has an electroluminescent lamp releasably and fixedly mateable with a slide connector to provide electrical energy for the light system.. The electroluminescent lamp includes a substrate, a rear electrode, a dielectric layer, a phosphor layer, a conductive layer, and a front electrode. The lamp further includes a tab interconnect tab portion, which receives the leads from the rear electrode and front electrode, and is configured to be releasably and fixedly mated with the connector.