A method of increasing color gamut of a color display includes grouping subpixels of R, G, and B primary colors of a pixel by grouping R, G, and B light sources of the color display with a corresponding light intensity adjustment mechanism based on an overlapping degree between two response spectrums of the light sources such that response spectrums of the light intensity adjustment mechanism of the same group have a least overlapping with that of other groups; and enabling groups of R, G, and B subpixels, activating R, G, and B light source and the corresponding light intensity adjustment mechanism, and disabling the remaining groups of subpixels all by turns for creating a vivid complete picture by time division color-mixing