a lighting-emitting unit;

an optical film, wherein light provided by the light-emitting unit propagates in a first direction after passing through the optical film, and the first direction is a direction perpendicular to a light-exiting surface of the backlight module; and

a light-adjusting layer located on a side of the optical film adjacent to the light-exiting surface of the backlight module,

wherein the light-adjusting layer includes a plurality of light-adjusting units, a light-adjusting unit of the plurality of light-adjusting units includes a first surface and a second surface oppositely arranged along the first direction, the first surface is located on a side of the second surface adjacent to the light-exiting surface of the backlight module, the second surface at least includes a first sub-surface and a second sub-surface, the first surface is a flat surface, along a second direction, a plane where the first sub-surface is located intersects a plane where the first surface is located, the first sub-surface is inclined to a side away from the light-exiting surface of the backlight module, along a third direction, a plane where the second sub-surface is located intersects the plane where the first surface is located, and the second sub-surface is inclined to a side away from the light-exiting surface of the backlight module, the first direction, the second direction and the third direction all intersect each other, and the second direction and the third direction are parallel to the light-exiting surface of the backlight module.