公开(公告)号：US20140354623A1

公开(公告)日：2014-12-04

申请号：US14459333

申请日：2014-08-14

Applicant: NOVATEK Microelectronics Corp.

Inventor： Sih-Ting Wang ,  Chung-Wen Wu ,  Chien-Cheng Tu ,  Chia-Chun Liu

IPC: G09G3/36

CPC classification number: G09G3/3696 ,  H05B33/0827 ,  H05B33/089

Abstract: A light-emitting diode driving device includes a light-emitting diode driving chip, for driving the one or more light-emitting diode strings according to a feedback voltage associated with the one or more light-emitting diode strings, and a voltage limiter, having a terminal coupled to the light-emitting diode driving chip and another terminal coupleable to the one or more light-emitting diode strings, for generating the feedback voltage for provision to the light-emitting diode driving chip according to a bottom voltage of the one or more light-emitting diode strings, and limiting the feedback voltage not to exceed a preset level; wherein the voltage limiter starts limiting the feedback voltage to substantially the preset level when the bottom voltage rises to the preset level.

Abstract translation: 发光二极管驱动装置包括：发光二极管驱动芯片，用于根据与一个或多个发光二极管串相关联的反馈电压驱动一个或多个发光二极管串;以及电压限制器，具有 连接到所述发光二极管驱动芯片的端子和可耦合到所述一个或多个发光二极管串的另一端子，用于根据所述一个或多个发光二极管串的底部电压产生用于提供给所述发光二极管驱动芯片的反馈电压， 更多的发光二极管串，并且限制反馈电压不超过预设电平; 其中当底电压上升到预设电平时，限压器开始将反馈电压限制在基本上为预设电平。