LED backlight module unit and temperature control method thereof

Abstract

The invention provides an LED backlight module and a temperature control method thereof, and temperature of the LED backlight module is controlled within a safe range. Concretely, the temperature control method of the LED backlight module comprises: brightness BL of the LED backlight module is obtained; the temperature of the LED backlight module is measured; the temperature of the LED backlight module is compared with a preset temperature; if the temperature of the LED backlight module is more than or equal to the preset temperature, an objective brightness BL' of the LED backlight module is computed; and the brightness of the LED backlight module is adjusted according to the objective brightness BL'. The temperature control method of the LED backlight module detects the temperature of the LED backlight module, and when the temperature of the LED backlight module reaches or exceeds a critical temperature, the temperature control method plans to further raise the temperature of the LED backlight module by lowering the brightness of the LED backlight module, and consequently protects the LED backlight module and avoids the reduction of the service life of the LED backlight module.

Description

technical field [0001] The present invention relates to a temperature control method, in particular to a temperature control method of an LED backlight module. Background technique [0002] In recent years, the rapid development of the flat panel display (FPD) industry dominated by thin film transistor liquid crystal display technology (TFT-LCD) has brought unprecedented development opportunities to the upstream panel industry and optical material industry. Among them, the backlight is provided by CCFL, EEFL , LED, OLED, FFL and other light sources, the more mature one is CCFL. The full name of CCFL is Cold Cathode Fluorescent Lamp, that is, cold cathode lamp. CCFL seals an inert gas Ne+Ar mixed gas in a glass tube, which contains a small amount of mercury vapor (several mg), and coats phosphor on the inner wall of the glass. A high-voltage high-frequency electric field is applied between the two electrodes, and the mercury vapor is excited in this electric field to produce...

AI Technical Summary

Problems solved by technology

Due to the high brightness requirements of the backlight module, the LED backlight module needs to use a large number of LED lamps, which leads to the problem of temperature rise of the LED backlight module

Chinese patent application CN200410002701.5 provides an adjusting device for reducing the temperature of the LED light source by adding a fan, but due to space and noise control limitations, this method cannot be applied to LED backlight modules

However, the patent application does not explain how to reduce the current of the LED wick, and the key issues such as how much the current is reduced

Because LED backlight modules are generally used in display devices, if the current of the LED tube is too low, the brightness of the LED backlight will be too low, which will affect the user's viewing. If the current of the LED tube is limited, the LED backlight module The influence of temperature control is limited, and it is possible that after reducing the current of the LED tube, the temperature of the LED backlight module will continue to rise

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