公开(公告)号：US20120127214A1

公开(公告)日：2012-05-24

申请号：US13241737

申请日：2011-09-23

申请人： Hee-Seok HAN ,  Jong-Seon Kim

发明人： Hee-Seok HAN ,  Jong-Seon Kim

IPC分类号： G09G3/14 ,  H05B37/02 ,  G09G5/10

CPC分类号： G09G3/342 ,  G09G2320/064 ,  G09G2330/028 ,  H05B33/0827

摘要： A light-emitting-diode (LED) driving circuit and a display device include a current driving circuit, a level detector, a comparing circuit, a digital control circuit, and a power supply circuit. The level detector detects a minimum detection voltage signal having a minimum voltage level among voltage signals of first terminals of respective LED strings. The comparing circuit generates a first comparison output signal and a second comparison output signal based on a headroom-control reference voltage and the minimum detection voltage signal. The digital control circuit adjusts a duty ratio of a gate control signal in a digital mode based on the first comparison output signal, the second comparison output signal and a control clock signal. Therefore, the LED driving circuit has a small area in a semiconductor integrated circuit.

摘要翻译： 发光二极管（LED）驱动电路和显示装置包括电流驱动电路，电平检测器，比较电路，数字控制电路和电源电路。 电平检测器检测在各个LED串的第一端子的电压信号中具有最小电压电平的最小检测电压信号。 比较电路基于余量控制参考电压和最小检测电压信号产生第一比较输出信号和第二比较输出信号。 数字控制电路基于第一比较输出信号，第二比较输出信号和控制时钟信号来调整数字模式中的门控制信号的占空比。 因此，LED驱动电路在半导体集成电路中具有小的面积。