Method of operating a light-emitting device
A method for operating a light-emitting device includes operating, at least for some pixels, a selected subpixel of a pixel and at least one further subpixel of the pixel configured to emit light of a different color to display a pure color corresponding to a dominant wavelength of the selected subpixel and providing, at least for some pixels, a correction matrix associated with the pixel for adjusting brightness of the subpixels of the pixel, wherein the correction matrix is provided by determining, at least for some pixels, a brightness of each subpixel of the pixel necessary to emit light of a given color, determining, at least for some pixels, a dominant wavelength (λ r , λ g , λ b ) of each subpixel, plotting dominant wavelengths (λ r , λ g , λ b ) of each subpixel in a CIE-XY color space and forming color triangles, and determining inner triangles of the color triangles in pairs.
1. A method of operating a light-emitting device, wherein the light-emitting device comprises a plurality of pixels, and wherein each pixel comprises at least three subpixels configured to emit light of different colors in pairs, the method comprising:
operating, at least for some pixels, a selected subpixel of a pixel and a further subpixel of the pixel configured to emit light of a different color to display a pure color corresponding to a dominant wavelength of the selected subpixel; and
providing, at least for some pixels, a correction matrix associated with the pixel for adjusting brightness of the subpixels of the pixel, wherein the correction matrix is provided by:
determining, at least for some pixels, a brightness of each subpixel of the pixel necessary to emit light of a given color;
determining, at least for some pixels, a dominant wavelength of each subpixel;
plotting dominant wavelengths of each subpixel in an International Commission on Illumination chromaticity values x and y (CIE-XY) color space and forming color triangles, wherein dominant wavelengths of each subpixel lie on a spectral line when the dominant wavelengths are plotted;
determining inner triangles of the color triangles in pairs, wherein each inner triangle is given by an intersection of the color triangles of each of the pair of color triangles; and
determining the given colors by corner points in the CIE-XY color space of an inner triangle with a largest area.
2. The method according to claim 1 , wherein, for at least some pixels, all subpixels are operated to display each given color.
3. The method according to claim 1 , further comprising providing, for all pixels, a further correction matrix associated with the pixel, wherein the further correction matrix adjusts a brightness of the subpixels of the pixel.
4. The method according to claim 3 , wherein the further correction matrix is provided by determining the brightness of each subpixel of the pixel.
5. The method according to claim 4 , wherein each pixel comprises exactly three subpixels emitting light of different colors in pairs.
6. The method according to claim 1 , wherein a current intensity at which each subpixel is operated depends on entries in the correction matrix.
7. The method according to claim 6 , wherein, in order to determine the current intensity at which subpixels are operated, a brightness correction is carried out in which, for at least some of the pixels, the brightness of the subpixels is normalized to a median value.
8. The method according to claim 6 , wherein, for determining the current intensity at which a subpixel is operated, a damage of neighboring subpixels of a same color is taken into account.
9. The method according to claim 8 ,
wherein, for at least some of the pixels, for each subpixel a number of damaged neighboring subpixels of the same color is determined, and
wherein an undamaged subpixel is operated at a current intensity which is greater the greater the number of its damaged neighboring subpixels of the same color.