公开(公告)号：US20150221249A1

公开(公告)日：2015-08-06

申请号：US14469619

申请日：2014-08-27

Applicant: Samsung Display Co., Ltd.

Inventor： Kyunho KIM ,  Youngsup KWON ,  Min-Gyu KIM ,  Eun Chul SHIN ,  Hwanwoong LEE ,  Min-Soo CHOI

IPC: G09G3/20 ,  G09G3/34

CPC classification number: G09G3/2092 ,  G09G3/3413 ,  G09G3/3648 ,  G09G2330/025 ,  G09G2330/04

Abstract: A backlight unit including, a controller configured to generate a control signal, a power converter configured generate a light-source voltage in response to the control signal, and at least one light emitting diode string connected between a first node and a second node and supplied with the light-source voltage from the first node, wherein the controller includes a current controller configured to adjust a current flow through the light emitting diode string, and an overvoltage controller connected between the light emitting diode string and the current controller, including a passive element, wherein the overvoltage controller is configured to connect the passive element between the second node and the current controller when a voltage of the second node of the light emitting diode is higher than a reference voltage.

Abstract translation: 一种背光单元，包括：被配置为产生控制信号的控制器，被配置为响应于控制信号产生光源电压的功率转换器，以及连接在第一节点和第二节点之间的至少一个发光二极管串， 具有来自第一节点的光源电压，其中控制器包括配置成调节通过发光二极管串的电流的电流控制器，以及连接在发光二极管串和电流控制器之间的过电压控制器，包括被动 元件，其中所述过电压控制器被配置为当所述发光二极管的第二节点的电压高于参考电压时，在所述第二节点和所述电流控制器之间连接所述无源元件。