公开(公告)号：US09642205B2

公开(公告)日：2017-05-02

申请号：US14825837

申请日：2015-08-13

Applicant: Samsung Display Co., Ltd.

Inventor： Jinwon Jang ,  Jintaek Hong

IPC: H05B33/08

CPC classification number: H05B33/0851 ,  H05B33/086 ,  Y02B20/347

Abstract: A backlight unit capable of substantially reducing a change in a level of a driving current includes: a light source; a static current switching element connected between the light source and a sensing node and controlling a driving current supplied to the light source; a sensing resistor connected between the sensing node and a ground; a static current controller controlling an operation of the static current switching element based on a sensing voltage from the sensing node and an externally supplied driving current control signal; and a driving current corrector generating the driving current control signal and correcting a level of the driving current control signal based on the sensing voltage.

公开(公告)号：US09763292B2

公开(公告)日：2017-09-12

申请号：US14841464

申请日：2015-08-31

Applicant: Samsung Display Co., Ltd.

Inventor： Wonhyoung Kang ,  Mingyu Kim ,  Taegon Im ,  Songyi Han ,  Jintaek Hong

IPC: H05B37/02 ,  H05B33/08 ,  G09G3/34 ,  H05B37/03

CPC classification number: H05B33/0815 ,  G09G3/3406 ,  G09G3/3426 ,  H05B33/0845 ,  H05B33/0851 ,  H05B33/089 ,  H05B37/0245 ,  H05B37/0263 ,  H05B37/029 ,  H05B37/032

Abstract: A backlight unit includes: a light source configured to emit light based on a driving current; and a backlight controller receiving a digital dimming signal that defines a length of an output period of the driving current from a pulse width modulator and configured to, when a duty ratio of the driving current is less than a reference duty ratio, modulates the duty ratio of the driving current so that the duty ratio of the driving current is equal to or greater than the reference duty ratio and decrease a duty ratio of the digital dimming signal.

公开(公告)号：US09877364B2

公开(公告)日：2018-01-23

申请号：US15176632

申请日：2016-06-08

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Jintaek Hong ,  Jinwon Jang ,  Daesik Lee

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0845

Abstract: A backlight unit which significantly reduces overshoot of a light source driving current and audible noise includes a light source driven by a light source driving voltage, a light source controller controlling the light source driving voltage, and a soft starter generating a first soft start voltage by receiving a charge signal from the light source controller and outputting the first soft start voltage to the light source controller, and generating a second soft start voltage when the charge signal is not applied thereto and outputting the second soft start voltage to the light source controller.