Light mixing element, light guide plate, backlight module and display device

A backlight module (BLM) of a display device, comprising:

• light sources, a plurality of light guide plates, and a plurality of light mixing elements, disposed between every two adjacent light guide plates, wherein
• each light mixing element, in a shape of prism, a cylinder of the prism of the light mixing element including:
• a light mixing element first light-emitting inclined surface;
• a light mixing element second light-emitting inclined surface, of which one side is connected with one side of the light mixing element first light-emitting inclined surface to form a top angle;
• a bottom surface arranged opposite to the top angle formed by the light mixing element first light-emitting inclined surface and the light mixing element second light-emitting inclined surface;
• a light mixing element incident surface connected between one side of the bottom surface and the other side of the light mixing element first light-emitting inclined surface;
• and
• a reflecting inclined surface connected between the other side of the bottom surface and the other side of the light mixing element second light-emitting inclined surface and arranged opposite to the light mixing element incident surface and the light mixing element first light-emitting inclined surface;
• the light sources are arranged opposite to the light mixing element incident surfaces of the light mixing elements;
• a cross section of each light guide plate takes a shape of a trapezoid, of which the upper bottom is downwards;
• surfaces, on which two sides of the trapezoid are disposed, are respectively a light guide plate first incident inclined surface and a light guide plate second incident inclined surface provided respectively corresponding to the light mixing element first light-emitting inclined surface of one light mixing element and the light mixing element second light-emitting inclined surface of the other light mixing element;
• in two adjacent light mixing elements, a light mixing element first light-emitting inclined surface of one light mixing element and a light mixing element second light-emitting inclined surface of the other light mixing element are respectively adhered to a light guide plate first incident inclined surface and a light guide plate second incident inclined surface of one light guide plate disposed between the two adjacent light mixing elements;
• and vertexes of top angles of the two light mixing elements abut against vertexes of two base angles of the light guide plate respectively.