Patent ID: 8339386
Filing Date: 2012-12-25
Classification: G09G

Abstract:
1. An electroluminescent (EL) device, comprising: an illumination area comprising one or more primary EL emitters; a reference area comprising a reference EL emitter; a reference driver circuit configured to cause the reference EL emitter to emit light while the EL device is active; a sensor configured to detect light emitted by the reference EL emitter; a measurement unit configured to detect an aging-related electrical parameter of the reference EL emitter while the reference EL emitter is emitting light; and a controller configured to: wherein the reference driver circuit is further configured to cause the reference EL emitter to emit light at two levels, a measurement level and a fade level, at different times, and wherein the measurement unit is further configured to take measurements of the reference EL emitter while the reference EL emitter emits light at the measurement level.