公开(公告)号：US08188674B2

公开(公告)日：2012-05-29

申请号：US12791281

申请日：2010-06-01

申请人： Jin-Hwa Chung ,  Iiyong Jung ,  Chan Son ,  Jaewoon Kim

发明人： Jin-Hwa Chung ,  Iiyong Jung ,  Chan Son ,  Jaewoon Kim

IPC分类号： H05B41/16

CPC分类号： H05B33/0815 ,  F21V23/04 ,  F21Y2115/10 ,  H05B33/0848 ,  H05B37/0227 ,  Y02B20/347

摘要： The present invention relates to an LED light emitting device and a driving method, and discloses a technology that may improve a slew rate of a channel current flowing through an LED channel when driving with a pulse width modulation method. For this, the present invention includes an LED channel consisting of a plurality of LED elements that are consecutively and serially connected, a current control switch that is connected to the end of the LED channel and performs a switching operation, and an operational amplifier that controls the switching operation of the current control switch according to a pulse width modulation signal. The LED driver samples an output voltage at the operational amplifier when the pulse width modulation signal is in an on state, and maintains the output voltage of the operational amplifier when the pulse width modulation signal is in an off state.

摘要翻译： LED发光装置及其驱动方法技术领域本发明涉及LED发光装置及其驱动方法，并且公开了以脉冲宽度调制方式驱动时可提高流过LED通道的通道电流的转换速度的技术。 为此，本发明包括由连续和串联连接的多个LED元件构成的LED通道，连接到LED通道的端部并执行开关操作的电流控制开关，以及控制 根据脉宽调制信号对电流控制开关进行开关动作。 当脉宽调制信号处于导通状态时，LED驱动器对运算放大器的输出电压进行采样，当脉宽调制信号处于截止状态时，维持运算放大器的输出电压。