公开(公告)号：US20250131877A1

公开(公告)日：2025-04-24

申请号：US18908330

申请日：2024-10-07

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Taeksu KWON ,  Insuk Kim ,  Jeeyeon Eom

IPC: G09G3/3225

Abstract: A display driving circuit includes an operational amplifier configured to, in a first phase of a test period, charge a source line of a display panel based on a first voltage received through a first input terminal, and in a second phase of the test period, output a comparison result signal by comparing a second voltage received through the first input terminal with a source line voltage received through a second input terminal; a discharge circuit configured to discharge the source line in the second phase; switches configured to, in the first phase, connect an output terminal of the operational amplifier to the source line, and in the second phase, connect the discharge circuit to the source line and the second input terminal of the operational amplifier; and a control logic configured to control a bias current of the operational amplifier based on the comparison result signal.

公开(公告)号：US11798480B2

公开(公告)日：2023-10-24

申请号：US17118728

申请日：2020-12-11

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Byunghun Han ,  Insuk Kim ,  Jungmoon Kim ,  Sungjin Park ,  Seunggun Ham

IPC: G09G3/3258 ,  G09G3/3266 ,  G09G3/3275

CPC classification number: G09G3/3258 ,  G09G3/3266 ,  G09G3/3275 ,  G09G2300/0426 ,  G09G2300/0819 ,  G09G2310/0243 ,  G09G2310/08 ,  G09G2330/021 ,  G09G2330/028

Abstract: An OLED display system includes a display panel, a driving circuit, a voltage generator and a power management application circuit (PMAC). The driving circuit provides scan signals to the display panel. The voltage generator generates a negative voltage based on a first driving voltage having a positive level and a second driving voltage having a negative level and provides the negative voltage to the driving circuit. The PMAC includes a power management application circuit (PMIC) and an additional circuit distinct from the PMIC and disposed externally to the PMIC. The PMIC applies a high power supply voltage and a low power supply voltage to the display panel and generates the first driving voltage based on a battery voltage. The additional circuit generates the second driving voltage based on the battery voltage. The driving circuit generates at least one of the scan signals based on the negative voltage.

公开(公告)号：US12032399B2

公开(公告)日：2024-07-09

申请号：US17721541

申请日：2022-04-15

Applicant: Samsung Electronics Co., Ltd.

Inventor： Jungmoon Kim ,  Jeongpyo Kim ,  Insuk Kim ,  Yeonjeong Lee

IPC: G05F1/575 ,  G09G3/20

CPC classification number: G05F1/575 ,  G09G3/20 ,  G09G2330/021

Abstract: An integrated circuit includes: a power supply circuit configured to generate a supply voltage from at least one of first and second power source voltages; and a system load configured to operate by receiving the supply voltage through an output node of the power supply circuit, wherein the power supply circuit includes: a first low drop-output (LDO) regulator configured to generate, from the first power source voltage, a first load current flowing to the system load through the output node; and a second LDO regulator configured to selectively generate a second load current flowing to the system load through the output node, from the second power source voltage based on a difference between voltages of internal nodes of the first LDO regulator.