Patent ID: 8456390
Filing Date: 2013-06-04
Classification: G09G

Abstract:
1. A method for compensating for aging of an electroluminescent (EL) emitter, comprising: a) providing the EL emitter for receiving current and emitting light having a luminance and a chromaticity that both correspond to the density of the current and an age of the EL emitter; b) providing a drive circuit electrically connected to the EL emitter for providing the current to the EL emitter; c) measuring the age of the EL emitter; d) selecting different black, first and second current densities based on the measured age, wherein e) receiving a designated luminance and a designated chromaticity for the EL emitter; f) calculating respective black, first and second percentages of a selected emission time using the designated luminance, the designated chromaticity, and the black, first and second luminances and chromaticities, wherein the sum of the black, first and second percentages is less than or equal to 100%; and g) providing the black, first and second percentages to the drive circuit to cause it to provide the black, first and second current densities to the EL emitter for the black, first and second percentages, respectively, of the selected emission time, so that the integrated light output of the EL emitter during the selected emission time has an output luminance and output chromaticity colorimetrically indistinct from the designated luminance and designated chromaticity, respectively, whereby the aging of the EL emitter is compensated.