Drive circuit and drive method for LED as well as LED device

发光二极管驱动电路、驱动方法及液晶显示装置

Abstract

一种发光二极管驱动电路,其包括一恒流电路、一发光二极管、一温度传感器和一微处理器。该恒流电路包括一输入端、一第一输出端和一第二输出端,该输入端连接该微处理器,该第一输出端连接该发光二极管,该第二输出端连接该微处理器。该温度传感器邻近该发光二极管并且连接该微处理器,该温度传感器侦测该发光二极管的工作温度,相应产生一当前温度信号并且传输到该微处理器。该微处理器根据该当前温度信号和该当前驱动电流的关系输出一具有某一占空比的脉冲信号。该恒流电路根据该占空比产生一相应大小的驱动电流驱动该发光二极管。
A light emitting diode driving circuit comprises a constant current circuit, a light emitting diode, a temperature sensor, and a micro-processor. The constant current circuit comprises an input end, a first output end and a second output end, wherein, the input end is connected with the micro-processor, the first output end is connected with the light emitting diode, and the second output end is connected with the micro-processor. The temperature sensor is adjacent to the light emitting diode and connected with the micro-processor, the temperature sensor senses the work temperature of the light emitting diode, correspondingly generates a present temperature signal and transmits the signal to the micro-processor. The micro-processor outputs a pulse signal with a certain duty ratio based on the relationship between the present temperature signal and a present driving current. The constant current circuit generates a driving current with corresponding magnitude based on the duty ratio to drive the light emitting diode.

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Cited By (6)

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    CN-102982773-AMarch 20, 2013杨伟LED (Light-emitting Diode) television
    CN-105163428-ADecember 16, 2015合肥艾斯克光电科技有限责任公司Radiating control device of light-emitting diode (LED) lamp