Backlight module and method for setting drive current thereof

Abstract

The invention discloses a method for setting drive current of a backlight module. The method comprises the following steps of: mounting the backlight module on a base; defining a plurality of areas from the top to the bottom of the backlight module; and reducing the drive current of an area having a longer distance with the base. In the embodiment of the invention, the conduction time of control signals of the drive current or the pulse width modulation of all areas of light emitting diodes is optimally set through the characteristic of area regulation and control of the drive current of the light emitting diodes so as to greatly improve the overall performance of the light emitting diodes. In addition, the embodiment also provides the backlight module with a temperature sensor, thus a driver can adjust the drive current of the backlight module in real time according to temperature signals measured by the temperature sensor so as to ensure that operation temperatures of the light emitting diodes in all the areas are approaching.

Description

technical field [0001] The present invention relates to a method for setting the driving current of the backlight module, in particular to a method for setting the driving current of each block of the backlight module so as to equalize the temperature of the backlight module. Background technique [0002] Liquid crystal displays have gradually become the mainstream of the current display market due to their advantages such as high image quality, no radiation, high space utilization efficiency, and low power consumption. Since the liquid crystal molecules themselves do not emit light, the liquid crystal display must provide the light source required by the liquid crystal panel through the backlight module, so that the liquid crystal panel can achieve the display effect. [0003] A general backlight module includes a light-emitting element and a driver. The driver includes electronic components such as power crystals and transformers, which generate high heat during operation....

AI Technical Summary

Problems solved by technology

This temperature change will seriously affect the operating life (lifetime) of the LEDs in each area, and the operating current of the LEDs is often limited by the highest temperature under normal uniform current operating conditions.

Due to the difference in temperature of the light box in each area, the optical film will expand, and it is easy to produce waves on the optical film, which will affect the quality of the picture

In addition, after a long period of use, the uniform brightness value of the backlight module 110 will also be significantly changed due to the different attenuation speeds of the light emitting diodes in each area, which also seriously affects the quality of the backlight module 110.

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