Patent ID: 8619103

Claim:
A method for compensating for chromaticity shift of an organic light-emitting diode (OLED) emitter, comprising: a) providing the OLED emitter for receiving current and emitting light having a luminance and a chromaticity that both correspond to the density of the current; b) providing a drive circuit electrically connected to the OLED emitter for providing the current to the OLED emitter; c) receiving a designated luminance and selecting a chromaticity for the OLED emitter; d) selecting different black, first and second current densities based on the designated luminance and selected chromaticity, wherein i) at the selected black, first and second current densities the emitted light has respective, black, first and second luminances and respective, black, first and second chromaticities; ii) the respective luminance of each of the black, first and second current densities is colorimetrically distinct from the other two luminances, or the respective chromaticity of each of the black, first and second current densities is colorimetrically distinct from the other two chromaticities; and iii) the black luminance is less than a selected threshold of visibility, and the first and second luminances are greater than or equal to the selected threshold of visibility; e) calculating respective black, first and second percentages of a selected emission time using the designated luminance, the selected 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 f) 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 OLED emitter for the black, first and second percentages, respectively, of the selected emission time, so that the integrated light output of the OLED emitter during the selected emission time has an output luminance and output chromaticity colorimetrically indistinct from the designated luminance and selected chromaticity, respectively, whereby the chromaticity shift of the OLED emitter is compensated.