Light-emitting diode (LED), LED packaging method, straight down type backlight module and liquid crystal display television

Abstract

The invention provides a light-emitting diode (LED), an LED packaging method, a straight down type backlight module and a liquid crystal display television. An LED packaging structure is achieved by the following steps of first covering the surface of a blue-light chip with a yttrium aluminum garnet (YAG) fluorescent powder layer; and then attaching a packaging glue layer to the surface of the YAG fluorescent powder layer, wherein the packaging glue layer is formed by light diffusion particles and a packaging glue. The refractive index of the YAG fluorescent powder layer is greater than the refractive index of the blue-light chip, so that the blue-light extraction efficiency is improved; the refractive indexes of the light diffusion particles and the packaging glue in the packaging glue layer are different, so that blue light and yellow light can be fully mixed after being refracted in the packaging glue for many times, the chrominance consistency of an LED light emergent surface is improved, and the chromaticity consistency of the straight down type backlight module is further improved.

Description

technical field [0001] The present invention relates to image display technology, in particular to a light-emitting diode (Light-Emitting Diode, referred to as: LED), an LED packaging method, a direct-lit backlight module, and a liquid crystal television. Background technique [0002] Chip-scale packaged LEDs are widely used in backlight modules due to their advantages such as low thermal resistance, good heat dissipation, and high current drive capability. In direct-lit backlight modules, LEDs need to be used with secondary lenses. The secondary lens can increase the beam angle of the light and form a larger spot on the exit surface. [0003] Since the main components of white light are blue light and yellow light, the most common way to synthesize white light is to use a blue-emitting gallium nitride blue chip to excite yellow yttrium aluminum garnet crystal (YttriumAluminate Garnet, referred to as: YAG) phosphor , to produce white light. [0004] In order to produce wh...

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide an LED, an LED packaging method, a direct-type backlight module, and a liquid crystal television, so as to overcome the problem in the prior art that the chromaticity consistency of the direct-type backlight module is affected by the uneven chromaticity of the LED itself

Images