Quantum dot backlight and liquid crystal display device

Abstract

The invention provides a quantum dot backlight, comprising a first light source emitting blue light, a second light source emitting red light, green quantum dot fluorescent powders, and an optical element. The blue light emitted by the first light source excites the green quantum dot fluorescent powders, and the green quantum dot fluorescent powders are excited to generate green light. The green light, the blue light, and the red light synthesize white light, and the optical element forms an area light source. The red light in the quantum dot backlight is independently provided by the second light source, and the first light source emitting blue light is used to generate blue light, and is used to excite the green quantum dot fluorescent powders to generate green light. Thus, performance ability on a red aspect is further improved, and the characteristic that the spectral bandwidth of the green quantum dot fluorescent powders is much smaller than that of conventional fluorescent powders, so the color gamut of the quantum dot backlight is further improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a quantum dot backlight source and a liquid crystal display device that can further improve the color gamut. Background technique [0002] The backlight source is an important part of the liquid crystal display device. Since the liquid crystal molecules themselves do not emit light, additional equipment is needed to provide it with a light source. Most of the existing backlight sources are LED light sources, but the current scheme of using blue LEDs with phosphors to emit white light results in a lower color gamut of liquid crystal display devices due to a wider spectrum. At present, the technology that has greatly improved the color gamut in liquid crystal display is quantum dot technology. The basic principle is that blue LED excites quantum dot phosphors to emit red light and green light, and the three are combined into white light. [0003] Since the spectral bandwidth of q...

AI Technical Summary

Problems solved by technology

[0003] Since the spectral bandwidth of quantum dot phosphors is far smaller than that of traditional phosphors, the color gamut can be greatly improved and can reach about 100% of NTSC. However, at present, it can only reach about 100% of NTSC, which is far from what the human eye can distinguish. all colors of

From the perspective of color performance, red is extremely important to color performance, because the current display technology is because red is not expressive enough, so the ability to express the color of human skin is relatively "weak". Compared with traditional phosphors, liquid crystal display devices with phosphors have greatly improved their performance in red, but they cannot fully express the color of human skin because they still have a wide spectral bandwidth.

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