a backlight module;

a liquid crystal display panel arranged on a light emerging side of the backlight module; and

a quantum dot composite film arranged between the liquid crystal display panel and the backlight module, wherein the quantum dot composite film comprises:

a quantum dot film layer; and

a plurality of first prism structures arranged on a light emerging surface of the quantum dot film layer;

wherein a material of each of the plurality of first prism structures comprises transparent polymer and inorganic particles;

wherein the quantum dot composite film further comprises a first optical film layer disposed on a side of the plurality of first prism structures away from the quantum dot film layer;

wherein a surface of the first optical film layer away from the quantum dot film layer comprises a plurality of second prism structures;

wherein a cross section of each of the plurality of second prism structures is a triangle or a trapezoid;

wherein each of the plurality of second prism structures comprises a plurality of first sub-prism structures and a plurality of second sub-prism structures, and at least one of the plurality of second sub-prism structure is interspersedly arranged between the plurality of first sub-prism structures or arranged on a side of the plurality of first sub-prism structures; and

wherein a bottom angle of each of the plurality of first sub-prism structures is different from a bottom angle of each of the plurality of second sub-prism structures; and/or a cross section of each of the plurality of first sub-prism structures is different from a cross section of each of the plurality of second sub-prism structures.