ELECTROLUMINESCENT DISPLAY WITH COMPENSATION OF EFFICIENCY VARIATIONS

摘要

An electroluminescent (EL) subpixel (60) having a readout transistor (80) is driven by a current source (160) when the drive transistor (70) is non-conducting. This produces an emitter-voltage signal from which an aging signal representing the efficiency of the EL emitter (50) can be computed. The aging signal is used to adjust an input signal (85) to produce a compensated drive signal (95) to compensate for changes in efficiency of the EL emitter.