公开(公告)号：US20140253846A1

公开(公告)日：2014-09-11

申请号：US13877167

申请日：2013-03-13

申请人： Anle Hu ,  Xianming Zhang ,  Hua Zhang

发明人： Anle Hu ,  Xianming Zhang ,  Hua Zhang

IPC分类号： H05B33/08 ,  G02F1/1335

CPC分类号： G02F1/133603 ,  G02F2001/133612 ,  H05B33/0812 ,  H05B33/0815

摘要： A liquid crystal display, a LED backlight source and the driving method thereof are disclosed. The LED backlight source includes a DC voltage input for inputting DC voltage, a boost circuit for increasing the voltage of the DC input and outputting the boosted DC voltage, a LED strip and a constant current driving circuit. The LED strip includes a plurality of serially connected LEDs and a first resistor (R1). The power consumption of the first MOS is reduced when the LEDs are driven. As such, the power consumption of the constant current driving circuit is reduced, so does the temperature. In this way, the energy conversion efficiency of the driving circuit of the LED backlight source is enhanced, and components within the constant current driving circuit are prevented from being burned out.

摘要翻译： 公开了液晶显示器，LED背光源及其驱动方法。 LED背光源包括用于输入DC电压的DC电压输入，用于增加DC输入的电压并输出升压的DC电压的升压电路，LED条和恒流驱动电路。 LED条包括多个串联LED和第一电阻（R1）。 当驱动LED时，第一MOS的功耗降低。 因此，恒流驱动电路的功耗降低，温度也降低。 以这种方式，提高了LED背光源的驱动电路的能量转换效率，并且防止恒流驱动电路内的部件被烧毁。

公开(公告)号：US20140266997A1

公开(公告)日：2014-09-18

申请号：US13879808

申请日：2013-03-26

申请人： Anle Hu ,  Li Li

发明人： Anle Hu ,  Li Li

IPC分类号： H05B33/08 ,  G09G3/36

CPC分类号： G09G3/36 ,  G09G3/3406 ,  H05B33/0818

摘要： The present invention provides a driving circuit of backlight module, comprising: a constant-voltage IC, equipped with a voltage feedback pin leg, for outputting constant voltage, wherein the voltage feedback pin leg connects to a negative electrode of an LED string; and a detecting resistor having one end connected to the negative electrode of the LED string, and the other end is grounded. The driving circuit of backlight module, the method for driving backlight module, and the LCD apparatus incorporated with such backlight module provided by the present invention use a various and low-costed constant-voltage IC. Changing the connection of its voltage feedback pin leg, so the constant-voltage IC can output the constant voltage and keep the current flowing through the LED string constantly, and thereby the constant-current driving is realized. Under the premise that the functions remain uncompromised, the complexity and the cost of the backlight driver circuit are reduced. In light of this, the voltage feedback pin leg could output the constant voltage by setting the comparator within the constant-voltage IC, so the voltage of its noninverting input end is identical to the voltage of its inverting input end, wherein the noninverting input end connects to the constant-voltage source. As a result, the configuration of the circuit is relatively simple, and easy to implement.

摘要翻译： 本发明提供了一种背光模组的驱动电路，其特征在于，包括：恒压IC，配有用于输出恒定电压的电压反馈针脚，其中，所述电压反馈针脚与LED串的负极连接; 以及检测电阻，其一端与LED串的负极连接，另一端接地。 本发明提供的背光模块的驱动电路，驱动背光模块的方法以及配有这种背光模组的LCD装置使用各种低成本的恒压IC。 改变其电压反馈引脚的连接，使恒压IC输出恒定电压，保持电流恒定流过LED串，从而实现恒流驱动。 在功能保持不变的前提下，降低了背光驱动电路的复杂性和成本。 有鉴于此，电压反馈引脚可以通过将比较器置于恒压IC内来输出恒定电压，因此其同相输入端的电压与其反相输入端的电压相同，其中，非反相输入端 连接到恒压源。 结果，电路的配置比较简单，易于实现。

公开(公告)号：US20140176014A1

公开(公告)日：2014-06-26

申请号：US13809448

申请日：2012-12-26

申请人： Anle Hu ,  Xiang Yang

发明人： Anle Hu ,  Xiang Yang

IPC分类号： G09G3/34

CPC分类号： G09G3/3426 ,  G09G2330/02

摘要： A light emitting diode (LED) backlight driver circuit includes an LED lightbar and a driver module of the LED lightbar. The driver module includes a backlight driver integrated chip (IC) regulating an output voltage of the driver module, and the backlight driver IC includes a first comparator correcting the output voltage of the driver module. The output end of each LED lightbar is coupled to an inverting input end of the first comparator, and a non-inverting input end of the first comparator is coupled to a protection module. The protection module includes a detection unit detecting an output current of the driver module. When the output current of the driver module detected by the detection unit is greater than a preset first current, the protection module outputs a first reference voltage to the non-inverting input end of the first comparator. When the output current of the driver module detected by the detection unit is lower than the preset first current, the protection module outputs a second reference voltage, which is lower than the first reference voltage, to the non-inverting input end of the first comparator.

摘要翻译： 发光二极管（LED）背光驱动电路包括LED灯条和LED灯条的驱动器模块。 驱动器模块包括调节驱动器模块的输出电压的背光驱动器集成芯片（IC），并且背光驱动器IC包括校正驱动器模块的输出电压的第一比较器。 每个LED灯条的输出端耦合到第一比较器的反相输入端，第一比较器的非反相输入端耦合到保护模块。 保护模块包括检测驱动器模块的输出电流的检测单元。 当由检测单元检测到的驱动器模块的输出电流大于预设的第一电流时，保护模块将第一参考电压输出到第一比较器的非反相输入端。 当由检测单元检测到的驱动器模块的输出电流低于预设的第一电流时，保护模块将低于第一参考电压的第二参考电压输出到第一比较器的非反相输入端 。