公开(公告)号：US09478175B2

公开(公告)日：2016-10-25

申请号：US14478165

申请日：2014-09-05

Applicant: LG Display Co., Ltd.

Inventor： Seongho Lim

IPC: G09G3/34 ,  H05B33/08 ,  H01L27/146 ,  G02F1/1335 ,  G09G3/36

CPC classification number: G09G3/342 ,  G02F1/133603 ,  G02F2001/133612 ,  G09G3/3406 ,  G09G3/36 ,  G09G3/3648 ,  G09G2320/0233 ,  G09G2320/0633 ,  G09G2320/064 ,  G09G2330/021 ,  H05B33/0815 ,  H05B33/0827 ,  Y02B20/346

Abstract: A liquid crystal display (LCD) device having an LCD panel with a plurality of pixels is disclosed. The LCD device includes gate and data driving circuits to provide a gate pulse and a data voltage to the pixels, respectively, and a timing controller to control the gate and data driving circuits. The LCD device also includes a backlight unit to provide light to the liquid crystal panel. The backlight unit includes a light source having at least one LED channel, a driving voltage generator to supply a driving voltage to the LED channel, and an LED driver to supply a conditional pulse width and amplitude modulation (CPWAM) signal to the LED channel. The CPWAM signal has a pulse with an amplitude and a width that are both variable from one period of a predetermined length to another period of the predetermined length.

Abstract translation: 公开了具有多个像素的LCD面板的液晶显示器（LCD）装置。 LCD装置包括分别向像素提供栅极脉冲和数据电压的栅极和数据驱动电路，以及用于控制栅极和数据驱动电路的定时控制器。 LCD装置还包括向液晶面板提供光的背光单元。 背光单元包括具有至少一个LED通道的光源，向LED通道提供驱动电压的驱动电压发生器，以及向LED通道提供条件脉宽调制（CPWAM）信号的LED驱动器。 CPWAM信号具有从预定长度的一个周期到预定长度的另一个周期都可变的幅度和宽度的脉冲。

公开(公告)号：US08907584B2

公开(公告)日：2014-12-09

申请号：US13671714

申请日：2012-11-08

Applicant: LG Display Co., Ltd.

Inventor： Seongho Lim ,  Eungkyu Kim ,  Taewoo Kim

IPC: H05B41/16

CPC classification number: H05B37/02 ,  G02F1/1368 ,  G09G3/342 ,  G09G2330/02 ,  G09G2330/021 ,  H05B33/0827 ,  H05B33/086

Abstract: An apparatus for controlling the constant current for multi-channel LEDs includes: a plurality of LED channels each comprising an LED array, a transistor, and a variable emitter resistor; a feedback sensing circuit for sensing the collector or drain voltage of a transistor of each of the LED channels; and a controller for increasing the variable emitter resistance of an LED channel in which the collector voltage of the transistor is higher than those of the other LED channels, in response to a feedback sensing result input from the feedback sensing circuit.

Abstract translation: 用于控制多通道LED的恒定电流的装置包括：多个LED通道，每个LED通道包括LED阵列，晶体管和可变发射极电阻; 用于感测每个LED通道的晶体管的集电极或漏极电压的反馈感测电路; 以及控制器，用于响应于从反馈感测电路输入的反馈感测结果，增加其中晶体管的集电极电压高于其它LED通道的集电极电压的LED通道的可变发射极电阻。