公开(公告)号：US09769892B2

公开(公告)日：2017-09-19

申请号：US14676469

申请日：2015-04-01

Applicant: Samsung Display Co., Ltd.

Inventor： Dae-Sik Lee ,  Jin-Won Jang ,  SeungYoung Choi

IPC: G09G3/36 ,  H05B33/08 ,  G09G5/10 ,  G09G3/34

CPC classification number: H05B33/083 ,  G09G3/342 ,  G09G5/10 ,  G09G2300/0426 ,  G09G2320/0285 ,  G09G2320/0626 ,  G09G2330/025 ,  G09G2330/045 ,  H05B33/0827 ,  H05B33/089

Abstract: Provided is a display device. According to one embodiment, the display device includes: a backlight unit with a plurality of light emitting strings including at least one light emitting diode; and a display panel displaying an image using light outputted from the backlight unit, wherein the backlight unit includes: a light source unit including the plurality of light emitting strings and a plurality of photo transistors controlling the plurality of light emitting strings; a DC-DC converter outputting the driving voltage to the light source unit; and a driving control unit applying activated gate voltages to turn on the plurality of photo transistors and detecting driving time differences between an output time for outputting the driving voltage and applying times for applying the gate voltages.

公开(公告)号：US09418623B2

公开(公告)日：2016-08-16

申请号：US13928582

申请日：2013-06-27

Applicant: Samsung Display Co., Ltd.

Inventor： Taegon Im ,  Myoung-Soo Kim ,  Hwanwoong Lee ,  Min-Soo Choi ,  Eun Chul Shin ,  Dae-Sik Lee

IPC: G09G3/36 ,  G09G5/10 ,  H05B33/08

CPC classification number: G09G5/10 ,  G09G3/3406 ,  H05B33/0827

Abstract: A backlight unit includes a power converter configured to generate a light source driving voltage in response to a voltage control signal, a plurality of light emitting diode strings, where each of the light emitting diode strings receives the light source driving voltage through a first terminal thereof, a plurality of transistors corresponding to the light emitting diode strings, where each of the transistors includes: a first electrode connected to a second terminal of a corresponding light emitting diode string thereof; a second electrode; and a control electrode, and a controller connected to the control electrode and the second electrode, where the controller outputs a plurality of current control signals to control electrodes of the transistors and generate the voltage control signal, where the controller generates an over-current detection signal when any one of the current control signals has a pulse width less than a predetermined reference width.

Abstract translation: 背光单元包括功率转换器，其被配置为响应于电压控制信号产生光源驱动电压，多个发光二极管串，其中每个发光二极管串通过其第一端子接收光源驱动电压 ，对应于发光二极管串的多个晶体管，其中每个晶体管包括：连接到其相应的发光二极管串的第二端子的第一电极; 第二电极; 以及控制电极，连接到控制电极和第二电极的控制器，其中控制器将多个电流控制信号输出到晶体管的控制电极并产生电压控制信号，其中控制器产生过电流检测 当任何一个电流控制信号具有小于预定参考宽度的脉冲宽度时的信号。