公开(公告)号：US10431147B2

公开(公告)日：2019-10-01

申请号：US15865903

申请日：2018-01-09

Applicant: Samsung Display Co., Ltd.

Inventor： Sungchun Park

IPC: H02M3/158 ,  G09G3/30 ,  H02M1/36 ,  G09G3/20 ,  H02M1/00 ,  H02M3/155

Abstract: A DC-DC converter includes: a first converter including a pass transistor coupled between the first node and a first output, and a body diode connected in parallel to the pass transistor; a sensor coupled between both ends of the pass transistor and which detects a driving current; and a second converter which outputs a second power voltage lower than the first power voltage to a second output. The second converter includes a master inverting converter which outputs the second power voltage independently of the driving current, a slave inverting converter which outputs the second power voltage when the driving current is greater than a predetermined threshold or when the input power voltage is greater than a predetermined boosting voltage limit, and an inverting converter controller which controls operations of the master and slave inverting converters in first and second drive modes based on the driving current and the input power voltage.

公开(公告)号：US20190228694A1

公开(公告)日：2019-07-25

申请号：US16257050

申请日：2019-01-24

Applicant: Samsung Display Co., Ltd.

Inventor： Yoon Young LEE ,  Sungchun Park

IPC: G09G3/20

Abstract: A display device includes: a display panel; a power management circuit configured to: perform a short detection operation with a first short detection condition during a start-up operation; supply first and second power supply voltages in the normal mode; and stop supplying the first and second power supply voltages in the low power mode; and a display driver configured to provide a first image signal in the normal mode and a second image signal for in the low power mode, the display driver comprising a power block configured to supply first and second standby power supply voltages in the low power mode, wherein, in a transition frame between the low power mode and the normal mode, the display driver provides the second image signal for the standby image to the display panel, and the power management circuit performs the short detection operation with a second short detection condition.