公开(公告)号：US11722059B2

公开(公告)日：2023-08-08

申请号：US17930527

申请日：2022-09-08

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Yang Uk Nam

IPC: G09G3/20 ,  H02M3/157 ,  H02M1/00 ,  H02M3/158

CPC classification number: H02M3/157 ,  G09G3/20 ,  H02M1/0009 ,  H02M3/1584 ,  G09G2330/023

Abstract: A DC-DC converter may include: a first converter for converting an input voltage to generate a first power supply voltage; a duty ratio controller configured generate a duty ratio control signal for controlling a duty ratio of a switching pulse of the first converter; a switching frequency controller configured to generate a switching frequency control signal for controlling a driving frequency of the first converter corresponding to a switching frequency of the switching pulse; and a current sensor configured to sense current flowing through the first converter. The first converter is driven at a switching frequency of a first frequency in a first mode, based on the switching frequency control signal, and generates the first power supply voltage of a first level, based on the duty ratio control signal. The switching frequency controller determines whether to turn off the current sensor.

公开(公告)号：US12027961B2

公开(公告)日：2024-07-02

申请号：US17825825

申请日：2022-05-26

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Yang Uk Nam ,  Sung Chun Park

IPC: G09G5/00 ,  G06F1/3206 ,  G06F1/3234 ,  G06F1/3296 ,  H02M1/00 ,  H02M3/158

CPC classification number: H02M1/0032 ,  G06F1/3206 ,  G06F1/3265 ,  G06F1/3296 ,  H02M3/1582

Abstract: A DC-DC converter includes a first converter outputting a first power voltage in a first driving method of generating an inductor current by alternately turning on transistors in a normal mode and outputting the first power voltage in a second driving method of generating the inductor current with the number of turn-on times less than that of the first driving method in a power saving mode, a second converter outputting a second power voltage in a third driving method of generating the inductor current with the number of turn-on times less than that of the second driving method in the power saving mode and determining differently magnitudes of the second power voltage in the power saving mode and the second power voltage in the normal mode, and a mode selector supplying a mode control signal to the converters to drive the converters according to one of the modes.

公开(公告)号：US09934753B2

公开(公告)日：2018-04-03

申请号：US15132519

申请日：2016-04-19

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Yang Uk Nam ,  Jong Jae Lee ,  Su Jin Kim ,  Dae Sik Lee

IPC: G09G5/00 ,  G09G3/36 ,  G01K1/20 ,  G01K7/22 ,  G01K13/00 ,  G06F1/26 ,  G06F1/32

CPC classification number: G09G3/3696 ,  G01K1/20 ,  G01K7/22 ,  G01K13/00 ,  G06F1/263 ,  G06F1/3206 ,  G09G3/3677 ,  G09G2310/0289 ,  G09G2310/0291 ,  G09G2310/08 ,  G09G2320/041 ,  G09G2330/021 ,  G09G2330/045

Abstract: A display device includes a scan driver which supplies a gate-on voltage or a gate-off voltage to scan lines, and a power supply unit which supplies the gate-off voltage to the scan driver, and includes a temperature sensor which generates a sensing voltage of which voltage value is changed corresponding to a temperature of a panel or an ambient temperature, a first voltage limiter which limits a minimum voltage value of the sensing voltage, and a second voltage limiter which limits a maximum voltage value of the sensing voltage.

公开(公告)号：US11881150B2

公开(公告)日：2024-01-23

申请号：US17872336

申请日：2022-07-25

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Yang Uk Nam ,  Sung Chun Park

IPC: G09G3/20

CPC classification number: G09G3/2096 ,  G09G2300/0819 ,  G09G2330/021

Abstract: A display device including: a power management integrated circuit (IC) including a feedback terminal for receiving a feedback voltage that corresponds to an input voltage and an output terminal for supplying a first voltage; a display driver IC electrically connected to the power management IC, the display driver IC including an input terminal for receiving the input voltage that corresponds to the first voltage; and a frequency compensation circuit connected to the input terminal, the feedback terminal, and the output terminal, the frequency compensation circuit including a feedback capacitor and a feedback resistor.

公开(公告)号：US20230237952A1

公开(公告)日：2023-07-27

申请号：US17872336

申请日：2022-07-25

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Yang Uk Nam ,  Sung Chun Park

IPC: G09G3/20

CPC classification number: G09G3/2096 ,  G09G2330/021 ,  G09G2300/0819

Abstract: A display device including: a power management integrated circuit (IC) including a feedback terminal for receiving a feedback voltage that corresponds to an input voltage and an output terminal for supplying a first voltage; a display driver IC electrically connected to the power management IC, the display driver IC including an input terminal for receiving the input voltage that corresponds to the first voltage; and a frequency compensation circuit connected to the input terminal, the feedback terminal, and the output terminal, the frequency compensation circuit including a feedback capacitor and a feedback resistor.

公开(公告)号：US11132938B2

公开(公告)日：2021-09-28

申请号：US16817475

申请日：2020-03-12

Applicant: Samsung Display Co., Ltd.

Inventor： Yang Uk Nam

IPC: G09G3/32

Abstract: A display device includes: pixels; and a power converter for receiving a first voltage, converting the first voltage to a second voltage, and providing an output terminal with the second voltage to control the pixels. The power converter includes: a first variable load connected to the output terminal of the power converter; a first comparator for providing a comparison result by comparing a difference between a first feedback voltage of the first voltage and a second feedback voltage of the second voltage; and a gap controller for controlling a magnitude of the first variable load to maintain the difference between the first voltage and the second voltage to be greater than or equal to a gap, based on the comparison result received from the first comparator.

公开(公告)号：US10186960B2

公开(公告)日：2019-01-22

申请号：US15183934

申请日：2016-06-16

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Seok Hwan Lee ,  Jong Jae Lee ,  Yang Uk Nam ,  Se Young Heo ,  Jun Ki Hong

IPC: H02M3/156 ,  G09G3/20 ,  H02M1/08 ,  H02M1/00

Abstract: A power supply includes a voltage converter circuit which converts an input voltage into an output voltage and outputs the output voltage, a voltage controller which controls the voltage converter circuit in response to a first feedback voltage or a second feedback voltage, a feedback terminal which supplies the first feedback voltage, an internal voltage divider circuit which supplies the second feedback voltage, and a switch unit which transfers the first feedback voltage or the second feedback voltage to the voltage controller.

公开(公告)号：US12057074B2

公开(公告)日：2024-08-06

申请号：US18372333

申请日：2023-09-25

Applicant: Samsung Display Co., LTD.

Inventor： Yang Uk Nam

IPC: G09G3/3233

CPC classification number: G09G3/3233 ,  G09G2300/0819 ,  G09G2300/0842 ,  G09G2310/08 ,  G09G2320/0247 ,  G09G2330/021 ,  G09G2330/028

Abstract: A display device includes: pixels, each of which is connected to a first power line and a second power line; and a power supply which, in a first display mode, supplies a first power voltage to the first power line and supplies a second power voltage to the second power line. The power supply includes: a first power supply which generates the first power voltage; a second power supply which generates the second power voltage; and a shut-down determiner which shuts down the first power supply and the second power supply in a case where the first power voltage is greater than a first reference voltage at a first time point, and the second power voltage is greater than a second reference voltage at a second time point.

公开(公告)号：US11463001B2

公开(公告)日：2022-10-04

申请号：US17332073

申请日：2021-05-27

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Yang Uk Nam

IPC: G09G3/20 ,  H02M3/158 ,  H02M3/157 ,  H02M1/00

Abstract: A DC-DC converter may include: a first converter for converting an input voltage to generate a first power supply voltage; a duty ratio controller configured generate a duty ratio control signal for controlling a duty ratio of a switching pulse of the first converter; a switching frequency controller configured to generate a switching frequency control signal for controlling a driving frequency of the first converter corresponding to a switching frequency of the switching pulse; and a current sensor configured to sense current flowing through the first converter. The first converter is driven at a switching frequency of a first frequency in a first mode, based on the switching frequency control signal, and generates the first power supply voltage of a first level, based on the duty ratio control signal. The switching frequency controller determines whether to turn off the current sensor.

公开(公告)号：US11348519B2

公开(公告)日：2022-05-31

申请号：US17101285

申请日：2020-11-23

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Yang Uk Nam

IPC: G09G3/3233 ,  G09G3/3275 ,  G09G3/3266

Abstract: A display device includes pixels, and a power converter configured to receive a first power voltage and an external input voltage and provide a gamma voltage to a first output terminal. The power converter includes a target power voltage generator circuit configured to generate a target power voltage, a first gamma voltage generator circuit configured to generate a first gamma voltage, a second gamma voltage generator circuit configured to generate a second gamma voltage, a first gap controller configured to generate the second gamma voltage based on the first power voltage, a reference target power voltage, and a reference gamma voltage during a period in which a display mode, and a first selector configured to selectively output the first gamma voltage or the second gamma voltage according to the display mode.