Aiming at the current RGBW-based multi-primary display, we analyze the manufacturing problems of RGBW sub-pixel arrangement and the shortcomings of common RGBW permutation on displaying images, and present a new RGBWRGB sub-pixel arrangement structure. We also analyze the shortcomings of common gamut mapping algorithms with RGB to RGBW in the face of complex images, and try to improve the algorithms to fit the proposed sub-pixel arrangement, while maintaining the color saturation of the displayed image and lifting the brightness.