公开(公告)号：US20190165675A1

公开(公告)日：2019-05-30

申请号：US16201325

申请日：2018-11-27

Applicant: Samsung Display Co., Ltd.

Inventor： Kihyun PYUN ,  Yu-chol KIM ,  Minyoung PARK ,  Min-soo CHOI

IPC: H02M3/157 ,  H02M3/158 ,  H03L7/099 ,  H03L7/089 ,  G09G3/36

Abstract: A display device includes a display panel, and a power management circuit including a switching regulator for supplying a power in a discontinuous conduction mode or in a continuous conduction mode, and a sensing circuit for sensing whether the switching regulator is operated in the discontinuous conduction mode, the switching regulator including a comparator for monitoring the supplied power, and an RS latch for receiving an output signal from the comparator, and the sensing circuit including a phase lock loop circuit for generating a first clock signal, a phase delay circuit for generating a second clock signal having a phase delayed from the first, and a determination circuit for outputting a first value when a pulse width of the output signal from the RS latch is small, and for outputting a second value when the pulse width of the output signal from the RS latch is not small.

公开(公告)号：US20150382430A1

公开(公告)日：2015-12-31

申请号：US14614289

申请日：2015-02-04

Applicant: Samsung Display Co., Ltd.

Inventor： WOOJIN LEE ,  Yu-chol KIM ,  Yeong Won KIM

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  Y02B20/347

Abstract: A backlight unit includes a DC-DC converter that converts a first voltage to a second voltage in response to a driving pulse signal and a driving controller that outputs the driving pulse signal in response to an over-current control signal to control a reference voltage and a level of the second voltage. The driving controller controls the reference voltage in response to the over-current control signal such that the reference voltage increases prior to the second voltage by a predetermined time when the second voltage needs to be increased. In addition, the driving controller controls the reference voltage in response to the over-current control signal when the second voltage needs to be decreased such that the reference voltage decreases later than the second voltage by the predetermined time.

Abstract translation: 背光单元包括DC-DC转换器，其响应于驱动脉冲信号将第一电压转换为第二电压;以及驱动控制器，响应于过电流控制信号输出驱动脉冲信号以控制参考电压，以及 第二电压的电平。 驱动控制器响应于过电流控制信号控制参考电压，使得在第二电压需要增加时，参考电压在第二电压之前增加预定时间。 此外，当需要减小第二电压时，驱动控制器响应于过电流控制信号控制参考电压，使得参考电压在第二电压下降预定时间。