Selection of the fourth pixel color in full-color display devices

A light-emitting diode (LED) array comprising:

• a plurality of pixels, each of the pixels comprising respective groups of light emitting diodes (LEDs), the plurality of pixels comprising:
• a first set of pixels configured to emit a first red dominant wavelength;
• a second set of pixels configured to emit a first green dominant wavelength;
• a third set of pixels configured to emit a first blue dominant wavelength;
• the first red dominant wavelength, the first green dominant wavelength, and the first blue dominant wavelength defining a RGB (red-green-blue) gamut;
• and
• a fourth set of pixels configured to emit a non-white emission comprising a luminous efficacy that is higher than either of the first pixel or the third pixel to increase power efficiency of the device.

A method for operating a display, the method comprising:

• determining an image to present on the display;
• driving a plurality of pixels to provide the image, each of the pixels comprising respective groups of light emitting diodes (LEDs), the plurality of pixels comprising:
• a first set of pixels configured to emit a first red dominant wavelength;
• a second set of pixels configured to emit a first green dominant wavelength;
• a third set of pixels configured to emit a first blue dominant wavelength;
• the first red dominant wavelength, the first green dominant wavelength, and the first blue dominant wavelength defining a RGB (red-green-blue) gamut;
• and
• a fourth set of pixels configured to emit a non-white emission comprising a luminous efficacy that is higher than either of the first pixel or the third pixel to increase power efficiency of the device;
• and
• controlling individual and/or sets of the plurality of pixels.