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    • 8. 发明授权
    • Color LED driver
    • 彩色LED驱动
    • US08144087B2
    • 2012-03-27
    • US12891272
    • 2010-09-27
    • Dong Woo Lee
    • Dong Woo Lee
    • G09G3/32
    • H05B33/0857G09G3/3413H05B33/0809
    • Disclosed herein is a color LED driver, which is capable of being implemented by a compact structure without a feedback structure and accompanying a small size and low cost, by directly connecting a negative temperature coefficient (NTC) thermistor to a driving current path of a color LED applied to an LCD backlight to compensate a characteristic variation of the LED due to a variation in a temperature. The color LED driver includes a driving constant voltage source 100 which supplies a predetermined driving constant voltage VD; a driving circuit 200 which converts the driving constant voltage VD of the driving constant voltage source 100 into a plurality of driving currents, for driving color LEDs, the plurality of driving currents including red LED driving current Ird, green LED driving current Igd and blue LED driving current Ibd; a temperature compensation unit 300 which compensates variations in the red LED driving current Ird and the green LED driving current Igd due to a variation in a temperature, among the plurality of driving currents from the driving circuit 200; and an LED unit 400 including a plurality of color LEDs which are turned on by the driving currents from the temperature compensation circuit 300 and the driving current from the driving circuit 200.
    • 这里公开了一种彩色LED驱动器,其能够通过将负温度系数(NTC)热敏电阻直接连接到颜色的驱动电流路径而通过紧凑的结构实现而没有反馈结构并且伴随着小尺寸和低成本 LED应用于LCD背光以补偿由于温度变化引起的LED的特性变化。 彩色LED驱动器包括提供预定的驱动恒定电压VD的驱动恒压源100; 驱动电路200,其将驱动恒压源100的驱动恒定电压VD转换为驱动彩色LED的多个驱动电流,多个驱动电流包括红色LED驱动电流Ird,绿色LED驱动电流Igd和蓝色LED 驱动电流Ibd; 温度补偿单元300,其补偿来自驱动电路200的多个驱动电流中的红色LED驱动电流Ird和由于温度变化引起的绿色LED驱动电流Igd的变化; 以及LED单元400,其包括通过来自温度补偿电路300的驱动电流和来自驱动电路200的驱动电流而导通的多个彩色LED。
    • 9. 发明授权
    • LED driving apparatus with temperature compensation function
    • LED驱动装置具有温度补偿功能
    • US07683864B2
    • 2010-03-23
    • US11657083
    • 2007-01-24
    • Dong Woo LeeSoo Ryong HwangMoo Youn Park
    • Dong Woo LeeSoo Ryong HwangMoo Youn Park
    • G09G3/32G09G3/36G09G5/00
    • H05B33/0851G09G3/3406G09G2320/041
    • An LED driving apparatus having a temperature compensation function includes a reference voltage generator for generating a first reference voltage and a non-inversion amplification unit for performing non-inversion amplification to a difference voltage between the first reference voltage and a forward voltage with a preset gain. A driving unit adjusts a supply voltage in response to the voltage from the non-inversion amplification unit to supply the adjusted supply voltage to a light source having light emitting diodes. A forward voltage detector detects the forward voltage at an anode of the light emitting diodes of the light source to supply the forward voltage to the non-inversion amplification unit. Luminance variation can be compensated according to temperature changes by using a forward voltage of an LED light source so that the forward voltage of the LED light source can be controlled in association with a target current value of ambient temperature.
    • 具有温度补偿功能的LED驱动装置包括用于产生第一参考电压的参考电压发生器和用于对第一参考电压和正向电压之间的差电压执行非反相放大的预设增益 。 驱动单元响应于来自非反相放大单元的电压调节电源电压,以将经调整的电源电压提供给具有发光二极管的光源。 正向电压检测器检测光源的发光二极管的阳极处的正向电压,以向非反相放大单元提供正向电压。 可以通过使用LED光源的正向电压根据温度变化来补偿亮度变化,使得可以与目标电流值环境温度相关联地控制LED光源的正向电压。