With the increase of the outgoing light angle of the micro spacing Mini LED direct display screen, there will be an angular color deviation from facing the white field to light red and then to light cyan. Through test and calculation, it is found that the inflection point of color coordinate appears at the position of 50°?~60°. Through the light type analysis, the color deviation on the surface of Mini LED screen is related to the light type mismatch and left-right asymmetry of RGB die chip. Due to the dispersion of RGB color in the medium, the escape angle of red light is greater than that of blue and green light, and the divergence of red light is stronger than that of blue and green light after passing through the medium. The difference in the intensity attenuation of red, green and blue light causes the angular color deviation of the outgoing light.