Temperature adaptive high brightness led direct type LCD backlight module

Abstract

The invention discloses a direct type liquid crystal backlight module with adaptive-temperature and high-brightness LEDs, wherein a high-brightness LED array is arranged in a shell as a light-emitting source; diffusion sheets are arranged above the LED array; the LED array is welded on an LED circuit board; curve reflecting plates are arranged at the periphery and the lower part of each LED, closely attaching above the LED circuit substrate; the curve reflecting plates are divided into a light reflecting part structure and a radiating part structure; a main body is made of a heat-conducting material; a reflecting surface is processed by polishing or reflecting coating; a reflecting curve is arranged on the curve reflecting plate corresponding to each LED; the reflecting curves form a radiating and reflecting structure; and each LED is located on a focus point or nearby the focus point of the reflecting curve. The direct type liquid crystal backlight module prevents the backlight module from increasing heating suddenly to burn the liquid crystal screen or reduce the service life of the liquid crystal screen or freeze the liquid crystal screen.

Description

technical field [0001] The invention relates to a temperature self-adaptive high-brightness LED direct-lit liquid crystal backlight module, which is a component for producing or refitting large-size LED backlight liquid crystal screens and belongs to the technical field of liquid crystal display. Background technique [0002] The liquid crystal LCD itself does not emit light, and the backlight module of the liquid crystal screen is the light source provider for the liquid crystal display. Under the premise of a certain light transmittance of the liquid crystal itself, the higher the intensity or brightness of the light provided by the backlight module, the brighter the picture displayed on the liquid crystal screen. [0003] Due to many advantages such as environmental protection, energy saving, long life, and thin thickness, LED backlight modules are gradually replacing traditional CCFL backlight modules. LED direct type LCD backlight module is one of the main technical s...

AI Technical Summary

Problems solved by technology

[0004] However, the luminous efficiency of LED backlight is only about half of that of CCFL backlight, especially in large-size LCD backlight modules. The phenomenon of uneven current density will be aggravated, and the decrease in luminous efficiency will be more serious, resulting in higher heat generation and affecting the improvement of the brightness of the LCD screen. Although the existing LED backlight module adopts active cooling technology, the current cooling effect of the technology is limited. , leading to the brightness of large-size LCD screens such as: 32 / 47 / 52 / 65 inch LCD screens are all around 400-500cd / ㎡

It can meet the requirements for LCD TVs; but for the fields that require high brightness of LCD screens, such as: outdoor billboards, generally the brightness of the daytime must reach more than 1200 cd / ㎡ to fully meet the requirements, and the brightness of about 400 cd / ㎡ is not enough

In order to increase the brightness of the backlight, it is necessary to increase the brightness of a single LED in the LCD backlight module or the density of the LED dot matrix, both of which will cause a sudden increase in the heat of the backlight module, reduce the service life of the LCD screen, or even burn out the LCD screen at high temperature

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