Light mixing module, display device having the light mixing module and design method for the light mixing module

A light mixing module, comprising a main substrate with a printed circuit, at least one chip-level light emitting unit arranged on the main substrate, and a diffusion plate arranged above the chip-level light emitting unit, the chip-level light emitting unit comprising a LED chip, a backlight bracket, a shading element and a supporting element, wherein,

• the LED chip is directly or indirectly mounted on the main substrate to achieve driving control;
• the backlight bracket is mounted on the main substrate, and the backlight bracket has a cup-shaped reflecting surface surrounding the LED chip;
• the shading element is suspended right above the LED chip by the supporting element;
• the cup-shaped reflecting surface is configured for reflecting a light directly emitted from the chip and a light reflected from the shading element to an area to be filled with light, reflecting the light from an area of light filling to an area between a center of the area to be filled with light and an edge at the other side of the area to be filled with light, reflecting the light directly emitting towards the lowest layer of the cup-shaped reflective surface to the edge at the other side of the area to be filled with light, and reflecting the light directly emitting towards the uppermost layer of the cup-shaped reflective surface to the center of the area to be filled with light, wherein a cone area within an angle θB relative to a main light emitting direction of the LED chip is defined as the area to be filled with light, and the angle θB of the area to be filled with light is in a range of 0 to ±30° .