公开(公告)号：US09852699B2

公开(公告)日：2017-12-26

申请号：US15061139

申请日：2016-03-04

Applicant: Samsung Display Co., LTD.

Inventor： Taegon Im ,  Min-gyu Kim ,  Youngsup Kwon

IPC: G09G3/36 ,  G09G3/34 ,  H05B33/08 ,  G09G3/00

CPC classification number: G09G3/342 ,  G09G3/003 ,  G09G3/3648 ,  G09G2310/08 ,  G09G2320/0233 ,  G09G2320/064 ,  G09G2330/021 ,  G09G2330/12 ,  H05B33/0815 ,  H05B33/0827 ,  H05B33/0851

Abstract: A backlight unit includes a power converter which generates a light source power voltage at a first node in response to a voltage control signal, at least one light emitting diode string which is connected between the first node and a second node and receives the light source power voltage through the first node, and a controller connected to the second node where the controller detects current of a detection node varying based on a duty ratio of the power control signal, and controls current flowing through the second node when the detected current is greater than a reference value.