A computer-implemented method determining a set of design parameters of a RGBW display, the method comprising: accessing a reference spectral power distribution SPD function of a white color primary, the white color primary produced by white subpixels of the display; accessing a first test SPD function of the white color primary of the RGBW display based on a first set of display parameters; computing reference XYZ values based on the reference SPD function and color matching functions for N observers; computing first test XYZ values based on the first test SPD function and the color matching functions for the N observers; translating the reference XYZ values and the first test XYZ values into color values in a perceptually uniform color space to generate reference color values and first test color values; computing first difference values based on the reference color values and the first test color values; computing a first measure of metameric stability based on the first difference values; determining a second test SPD function of the white color primary of the RGBW display based on a second set of display parameters; computing second test XYZ values based on the second test SPD and the color matching functions for the N observers; translating the second test XYZ values into color values in the perceptually uniform color space to generate second test color values; computing second difference values based on the reference color values and the second test color values; computing a second measure of metameric stability based on the second difference values; and on a condition that the first measure of metameric stability is smaller than the second measure of metameric stability, selecting the first set of display parameters as design parameters for the RGBW display, otherwise selecting the second set of display parameters as design parameters, wherein the design parameters comprise one or more combinations of light emitters, phosphors, quantum dots, and display filters. accessing a reference spectral power distribution SPD function of a white color primary, the white color primary produced by white subpixels of the display; accessing a first test SPD function of the white color primary of the RGBW display based on a first set of display parameters; computing reference XYZ values based on the reference SPD function and color matching functions for N observers; computing first test XYZ values based on the first test SPD function and the color matching functions for the N observers; translating the reference XYZ values and the first test XYZ values into color values in a perceptually uniform color space to generate reference color values and first test color values; computing first difference values based on the reference color values and the first test color values; computing a first measure of metameric stability based on the first difference values; determining a second test SPD function of the white color primary of the RGBW display based on a second set of display parameters; computing second test XYZ values based on the second test SPD and the color matching functions for the N observers; translating the second test XYZ values into color values in the perceptually uniform color space to generate second test color values; computing second difference values based on the reference color values and the second test color values; computing a second measure of metameric stability based on the second difference values; and on a condition that the first measure of metameric stability is smaller than the second measure of metameric stability, selecting the first set of display parameters as design parameters for the RGBW display, otherwise selecting the second set of display parameters as design parameters, wherein the design parameters comprise one or more combinations of light emitters, phosphors, quantum dots, and display filters.