Backlight unit and liquid crystal display device

Abstract

The invention provides a backlight unit and a liquid crystal display device. The backlight unit comprises a backplane, a light guide plate arranged at the bottom of the backplane, a light source arranged opposite to a light incidence surface of the light guide plate, a diaphragm set arranged above the light guide plate and a reflection piece arranged below the light guide plate, the surface of the light guide plate is provided with multiple sink parts encapsulated with quantum dot materials, and is provided with protective layers in a fitted mode, light rays generated by the quantum dot are mixed into a white light source under the excitation of the light rays, multiple refraction layers are fitted on the surfaces of the protective layers in a stacked mode towards an outer side layer in sequence, and the refractive indexes of all the refraction layers are between the protective layer and the air, and dwindle layer-by-layer in sequence. By reducing a refraction index difference value among all layers of mediums on emergence paths of the light rays from the protective layer to the air, the number of total-reflection light rays which occurs in the protective layer is reduced, and the emergence number of the light ray is further increased, and the light emergence efficiency of white back light in the backlight unit is further improved.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a backlight module and a liquid crystal display device. Background technique [0002] With the continuous development of liquid crystal display technology, consumers have increasing requirements on the image quality of display devices, and high color gamut backlight technology for improving image quality has become a research focus in the field of liquid crystal display technology. [0003] At present, quantum dot materials are usually applied in backlight modules to obtain white backlights with high color gamut, meeting the requirements for high color gamut backlights in display devices. Among them, the specific structure of the backlight module using quantum dot materials is as follows: figure 1 As shown, the pit 120 encapsulated with the quantum dot material 121 is arranged on the light-emitting surface 111 of the light guide plate 110, and the light emitted by...

AI Technical Summary

Problems solved by technology

[0005] The present inventor finds out when implementing related technology: because the material of protective layer 150 selects Al 2 o 3 or SiO 2 , and its refractive index is about 1.6-1.8. When the light rays excited by the quantum dot material 121 are emitted to the outside air layer through the protective layer 150, because the refractive index

Images