A backlight assembly, a display panel and a display device. In the backlight assembly, a middle frame is at a side of the light guide plate close to the light emitting element, arranged along an edge of the light guide plate, and enables a part of the light emitted by the light emitting element to enter the frame area, the middle frame includes an outer part and an inner part including an transparent upper part; the upper part of the outer part and the upper part of the inner part are at least partially overlapped with each other in the vertical direction, and the lower part of the outer part is at a side of the upper part of the inner part close to the light emitting element in the vertical direction; the upper part of the outer part and the lower part of the outer part are transparent.