The utility model discloses a backlight unit and contain this backlight unit's display screen and display device. Wherein, backlight unit includes: the light source, the light source includes three kind at least luminescence units that send different colour light, the light guide plate, the light guide plate includes two at least adjacent income light sides, and every is gone into the light side and is provided with a plurality ofly relatively the luminescence unit, a plurality of luminescence units with be the range of at least delegation in going into the parallel plane of light side, just the light that the luminescence unit sent is the convergence formula and propagates after getting into the light guide plate. The utility model provides a technical scheme can realize the colourity of light and adjustting of the lighteness's pluralism and the regional independent control of being shaded, provides wide colour gamut and shows.