OLED display with improved power performance
View Patent ↗An OLED display for producing a full color image, comprising a plurality of at least four different colored pixels including three different colored addressable gamut-defining pixels and a fourth addressable within-gamut pixel, each pixel having an organic light-emitting diode with first and second electrodes and one or more organic light-emitting layers provided between the electrodes; the OLED display having a selected display white point, display peak luminance, gamut-defining pixel peak luminances and within-gamut pixel peak luminance; and drive circuitry for regulating luminance of the organic light-emitting diode of each of the colored pixels wherein the sum of the gamut-defining pixel peak luminances is less than the display peak luminance.
1. A method for operating an OLED display for producing a full color image at reduced power, comprising:
a) providing a plurality of at least four different colored pixels including three different colored addressable gamut-defining pixels and a fourth addressable within-gamut pixel, each pixel having an organic light-emitting diode with first and second electrodes and one or more organic light-emitting layers provided between the electrodes;
b) selecting a display white point, display peak luminance, gamut-defining pixel peak luminances and within-gamut pixel peak luminance; and
c) regulating luminance of the organic light-emitting diode of each of the colored pixels wherein the sum of the gamut-defining pixel peak luminances is less than the display peak luminance.
2. The method of claim 1 wherein luminance regulation is provided by mapping a range of input signals, each corresponding to a gamut-defining pixel luminance, into a narrower range of gamut-defining pixel luminances.
3. The method of claim 1 wherein luminance regulation includes converting gamut-defining pixel signals to modified gamut-defining pixel signals and within-gamut pixel signals.
4. The method of claim 3 wherein the luminance regulation further includes scaling.
5. The method of claim 3 wherein the luminance regulation further includes clipping or non-linear mapping.
6. The method of claim 3 wherein the luminance regulation further includes a matrix operation.
7. The method of claim 1 wherein luminance regulation includes providing drive circuitry for applying a maximum voltage across the first and second electrodes of the at least four different colored pixels for regulating current through the organic light-emitting diode of each of the colored pixels wherein the maximum voltage is selected in accordance with the regulated luminance.
8. The method of claim 1 wherein the display peak luminance is provided by the within-gamut pixel or the within-gamut pixel and one or more of the gamut-defining pixels.
9. The method of claim 1 wherein the three different colored addressable gamut-defining pixels respectively produce red, green, and blue light and the fourth addressable within-gamut pixel produces white light.