Patents by Inventor Eui-Myeong CHO

Eui-Myeong CHO has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250252906
    Abstract: A display device includes first and second pixels disposed in a pixel row, first and second data lines connected to the first and second pixels, respectively, a data driver providing first and second data voltages to a first output line, and a demultiplexer selectively connecting the first and second data lines to the first output line. Each of the first and second pixels includes a first transistor, a second transistor, a third transistor, a first capacitor, and a light emitting element. The first data voltage is written to the first pixel through the first data line in a first period of a writing period in which a write gate signal has a turn-on voltage level, and the second data voltage is written to the second pixel through the second data line in a second period of the writing period that is after the first period.
    Type: Application
    Filed: January 6, 2025
    Publication date: August 7, 2025
    Inventors: JIN-WOOK YANG, HONGSOO KIM, SEHYUK PARK, DONGGYU LEE, JAE-HYEON JEON, EUI-MYEONG CHO
  • Patent number: 12374264
    Abstract: Disclosed is a display device including a display panel including a pixel, a scan driver, and a driving controller that controls driving of the scan driver. The scan driver provides the pixel with a first mode scan signal having a first active period and a second active period in a first mode and provides the pixel with a second mode scan signal having a compensation active period in a second mode. The driving controller determines whether an operating frequency of the display device corresponds to one of predetermined compensation frequencies in a variable frequency mode, and operates the scan driver in the first mode or the second mode depending on a determination result of the determining.
    Type: Grant
    Filed: August 29, 2023
    Date of Patent: July 29, 2025
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jihye Kim, Yu-Chol Kim, Jin-Wook Yang, Seongoh Yeom, Eui-Myeong Cho, Jakyoung Jin
  • Patent number: 12322334
    Abstract: A display device includes a display panel which includes first and second pixels disposed in one pixel row, a first gate line connected to the first pixel, a second gate line connected to the second pixel, a first data line connected to the first pixel, and a second data line connected to the second pixel, a gate driver which provides a first gate signal and a second gate signal to the first gate line and the second gate line, respectively, and a data driver disposed adjacent to a first side of the display panel, where the data driver provides a data signal to the first data line. The first data line and the second data line are connected to each other at a second side of the display panel opposite to the first side of the display panel.
    Type: Grant
    Filed: August 21, 2023
    Date of Patent: June 3, 2025
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Eui-Myeong Cho, Yu-Chol Kim, Jihye Kim, Jin-Wook Yang, Seongoh Yeom, Jakyoung Jin
  • Patent number: 12322324
    Abstract: A display device includes a display panel, a gate driver, and a driving controller. The display panel includes a pixel. The gate driver applies an anode initialization signal to the pixel. The driving controller receives a horizontal synchronization signal, receives input image data at a variable frame frequency, and controls the gate driver. A frame period for the display panel includes a scan period and one or more hold periods, the driving controller generates a count value by counting a number of pulses of the horizontal synchronization signal, and determines a current frame period as the hold period when the count value exceeds a reference value, and a time length of the anode initialization signal in each of the one or more hold periods is longer than a time length of the anode initialization signal in the scan period.
    Type: Grant
    Filed: September 20, 2023
    Date of Patent: June 3, 2025
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Jihye Kim, Yu-Chol Kim, Jin-Wook Yang, Seongoh Yeom, Eui-Myeong Cho, Jakyoung Jin
  • Publication number: 20250174193
    Abstract: Disclosed is a pixel which includes a light emitting element, a first capacitor, a first transistor including a gate electrode connected to the first node, a second transistor including a gate electrode connected to a first scan line, a third transistor including a gate electrode connected to a second scan line, and a fourth transistor including a gate electrode connected to the second scan line. During a first initialization period, a first scan signal provided to the first scan line and a second scan signal provided to the second scan line are at an active level.
    Type: Application
    Filed: November 18, 2024
    Publication date: May 29, 2025
    Inventors: HONGSOO KIM, JIN-WOOK YANG, YU-CHOL KIM, Seongoh YEOM, EUI-MYEONG CHO, JAKYOUNG JIN
  • Patent number: 12223914
    Abstract: A display device includes pixels including a light-emitting element, and an initialization transistor connected between an anode electrode of the light-emitting element and a first initialization power line to which a voltage of initialization power is supplied, and turned on when an initialization scan signal is supplied, and an initialization scan driver which supplies the initialization scan signal. The initial scan driver supplies an i-th (i is a natural number) initial scan signal to overlap an (i?1)-th initial scan signal, and supplies an (i+1)-th initial scan signal so as not to overlap the i-th initial scan signal, and the initialization scan signal is set to a gate-on voltage.
    Type: Grant
    Filed: June 6, 2023
    Date of Patent: February 11, 2025
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Seong Oh Yeom, Yu Chol Kim, Ji Hye Kim, Jin Wook Yang, Eui Myeong Cho, Ja Kyoung Jin
  • Patent number: 12062333
    Abstract: A pixel includes a first transistor connected between a first power line and a first node, and including a gate electrode connected to a second node, a second transistor connected between a data line and the second node, and including a gate electrode connected to a scan line, a third transistor connected between a first sensing line and the first node, and including a gate electrode connected to a first control line, a fourth transistor connected between a second sensing line and a third node, and including gate electrode connected to a second control line, a first sub light emitting unit including light emitting elements connected in parallel in a forward direction between the first node and the third node, and a second sub light emitting unit including light emitting elements connected in parallel in the forward direction between the third node and a second power line.
    Type: Grant
    Filed: February 21, 2023
    Date of Patent: August 13, 2024
    Assignee: Samsung Display Co., Ltd.
    Inventors: Eui Myeong Cho, Ho Cheol Kang, Jae Hyun Koh, Seok Young Yoon
  • Publication number: 20240257720
    Abstract: A luminance compensation method of a display device includes a first luminance for a reference grayscale at a first operating frequency and a second luminance for the reference grayscale at a second operating frequency are measured. A first reference value is calculated based on the first luminance and the second luminance, a first duty ratio of the initialization control signal is changed into a second duty ratio depending on a comparison result of the first reference value and a threshold value After the first duty ratio is changed into the second duty ratio, a third luminance for the reference grayscale is measured, and a second reference value is calculated based on the first luminance and the third luminance. A final duty ratio corresponding to the threshold value is calculated depending on a comparison result of the second reference value and the threshold value.
    Type: Application
    Filed: October 25, 2023
    Publication date: August 1, 2024
    Inventors: Seongoh YEOM, YU-CHOL KIM, JIHYE KIM, JIN-WOOK YANG, EUI-MYEONG CHO, JAKYOUNG JIN
  • Publication number: 20240249661
    Abstract: A display device includes a display panel including a plurality of pixels and a panel driver that drives the display panel in a first mode where an operating frequency is fixed, and a second mode where the operating frequency is variable. Each of the plurality of pixels includes a light-emitting element and a pixel driving circuit connected to a first electrode of the light-emitting element. The panel driver includes a driving controller that determines whether the operating frequency corresponds to one of predetermined compensation frequencies in the second mode, and outputs a voltage control signal depending on the determination result, and a voltage generator that changes a voltage level of an anode initialization voltage applied to the first electrode in response to the voltage control signal.
    Type: Application
    Filed: November 6, 2023
    Publication date: July 25, 2024
    Inventors: JAKYOUNG JIN, JIHYE KIM, YU-CHOL KIM, JIN-WOOK YANG, Seongoh YEOM, EUI-MYEONG CHO
  • Patent number: 12039916
    Abstract: A display device includes: pixels, each of the pixels including at least one light emitting element and a first transistor configured to supply a driving current to the at least one light emitting element; a sensing unit configured to sense a driving current of the first transistor, which corresponds to a data voltage applied to one pixel from among the pixels, the sensing unit being configured to detect a luminance of the light emitting element, which corresponds to the driving current; a gamma calculator configured to receive the driving current and the luminance of the light emitting element from the sensing unit, to calculate a gamma changed based on the driving current and the luminance of the light emitting element, and to provide, to a memory, the gamma changed based on the driving current and the luminance of the light emitting element.
    Type: Grant
    Filed: December 2, 2022
    Date of Patent: July 16, 2024
    Assignee: Samsung Display Co., Ltd.
    Inventors: Eui Myeong Cho, Ho Cheol Kang, Jae Hyun Koh, Seok Young Yoon
  • Publication number: 20240169926
    Abstract: A display device includes pixels including a light-emitting element, and an initialization transistor connected between an anode electrode of the light-emitting element and a first initialization power line to which a voltage of initialization power is supplied, and turned on when an initialization scan signal is supplied, and an initialization scan driver which supplies the initialization scan signal. The initial scan driver supplies an i-th (i is a natural number) initial scan signal to overlap an (i?1)-th initial scan signal, and supplies an (i+1)-th initial scan signal so as not to overlap the i-th initial scan signal, and the initialization scan signal is set to a gate-on voltage.
    Type: Application
    Filed: June 6, 2023
    Publication date: May 23, 2024
    Inventors: Seong Oh YEOM, Yu Chol KIM, Ji Hye KIM, Jin Wook YANG, Eui Myeong CHO, Ja Kyoung JIN
  • Publication number: 20240161693
    Abstract: A display device includes a display panel which includes first and second pixels disposed in one pixel row, a first gate line connected to the first pixel, a second gate line connected to the second pixel, a first data line connected to the first pixel, and a second data line connected to the second pixel, a gate driver which provides a first gate signal and a second gate signal to the first gate line and the second gate line, respectively, and a data driver disposed adjacent to a first side of the display panel, where the data driver provides a data signal to the first data line. The first data line and the second data line are connected to each other at a second side of the display panel opposite to the first side of the display panel.
    Type: Application
    Filed: August 21, 2023
    Publication date: May 16, 2024
    Inventors: EUI-MYEONG CHO, YU-CHOL KIM, JIHYE KIM, JIN-WOOK YANG, SEONGOH YEOM, JAKYOUNG JIN
  • Publication number: 20240153434
    Abstract: Disclosed is a display device including a display panel including a pixel, a scan driver, and a driving controller that controls driving of the scan driver. The scan driver provides the pixel with a first mode scan signal having a first active period and a second active period in a first mode and provides the pixel with a second mode scan signal having a compensation active period in a second mode. The driving controller determines whether an operating frequency of the display device corresponds to one of predetermined compensation frequencies in a variable frequency mode, and operates the scan driver in the first mode or the second mode depending on a determination result of the determining.
    Type: Application
    Filed: August 29, 2023
    Publication date: May 9, 2024
    Inventors: JIHYE KIM, YU-CHOL KIM, JIN-WOOK YANG, Seongoh YEOM, EUI-MYEONG CHO, JAKYOUNG JIN
  • Publication number: 20240144861
    Abstract: A display device includes a display panel, a gate driver, and a driving controller. The display panel includes a pixel. The gate driver applies an anode initialization signal to the pixel. The driving controller receives a horizontal synchronization signal, receives input image data at a variable frame frequency, and controls the gate driver. A frame period for the display panel includes a scan period and one or more hold periods, the driving controller generates a count value by counting a number of pulses of the horizontal synchronization signal, and determines a current frame period as the hold period when the count value exceeds a reference value, and a time length of the anode initialization signal in each of the one or more hold periods is longer than a time length of the anode initialization signal in the scan period.
    Type: Application
    Filed: September 20, 2023
    Publication date: May 2, 2024
    Inventors: JIHYE KIM, YU-CHOL KIM, JIN-WOOK YANG, Seongoh Yeom, EUI-MYEONG CHO, JAKYOUNG JIN
  • Patent number: 11961457
    Abstract: A display device, includes: a display panel including a pixel electrically coupled to a gate line and a data line; a gate driver configured to provide a gate signal to the gate line; and a data driver configured to provide a data signal to the data line, wherein the gate driver is configured to sequentially provide a first gate signal and a second gate signal to the gate line during a first frame period, wherein the data driver is configured to provide a first data signal to the data line in response to the first gate signal, and to provide a second data signal to the data line in response to the second gate signal, and wherein the second data signal is different from the first data signal and varies dependent on the first data signal.
    Type: Grant
    Filed: January 9, 2023
    Date of Patent: April 16, 2024
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jae Hyun Koh, Sung Hoon Bang, Eui Myeong Cho, Ho Cheol Kang, Seok Young Yoon
  • Publication number: 20230389377
    Abstract: A display device includes a base layer including a first surface and a second surface, a first line disposed on the first surface of the base layer, a second line corresponding to the first line and disposed on the second surface of the base layer, and a connection film electrically contacting at least a portion of the second line and electrically connected to a printed circuit board and a driving circuit. The driving circuit is disposed between the printed circuit board and the connection film.
    Type: Application
    Filed: February 2, 2023
    Publication date: November 30, 2023
    Applicant: Samsung Display Co., LTD.
    Inventors: Jae Ill KIM, Ji Hyun KIM, Byoung Haw PARK, Dae Hwan JANG, Eui Myeong CHO
  • Publication number: 20230267885
    Abstract: A pixel includes a first transistor connected between a first power line and a first node, and including a gate electrode connected to a second node, a second transistor connected between a data line and the second node, and including a gate electrode connected to a scan line, a third transistor connected between a first sensing line and the first node, and including a gate electrode connected to a first control line, a fourth transistor connected between a second sensing line and a third node, and including gate electrode connected to a second control line, a first sub light emitting unit including light emitting elements connected in parallel in a forward direction between the first node and the third node, and a second sub light emitting unit including light emitting elements connected in parallel in the forward direction between the third node and a second power line.
    Type: Application
    Filed: February 21, 2023
    Publication date: August 24, 2023
    Inventors: Eui Myeong CHO, Ho Cheol KANG, Jae Hyun KOH, Seok Young YOON
  • Publication number: 20230230534
    Abstract: A display device, includes: a display panel including a pixel electrically coupled to a gate line and a data line; a gate driver configured to provide a gate signal to the gate line; and a data driver configured to provide a data signal to the data line, wherein the gate driver is configured to sequentially provide a first gate signal and a second gate signal to the gate line during a first frame period, wherein the data driver is configured to provide a first data signal to the data line in response to the first gate signal, and to provide a second data signal to the data line in response to the second gate signal, and wherein the second data signal is different from the first data signal and varies dependent on the first data signal.
    Type: Application
    Filed: January 9, 2023
    Publication date: July 20, 2023
    Inventors: Jae Hyun KOH, Sung Hoon BANG, Eui Myeong CHO, Ho Cheol KANG, Seok Young YOON
  • Publication number: 20230215346
    Abstract: A display device includes: pixels, each of the pixels including at least one light emitting element and a first transistor configured to supply a driving current to the at least one light emitting element; a sensing unit configured to sense a driving current of the first transistor, which corresponds to a data voltage applied to one pixel from among the pixels, the sensing unit being configured to detect a luminance of the light emitting element, which corresponds to the driving current; a gamma calculator configured to receive the driving current and the luminance of the light emitting element from the sensing unit, to calculate a gamma changed based on the driving current and the luminance of the light emitting element, and to provide, to a memory, the gamma changed based on the driving current and the luminance of the light emitting element.
    Type: Application
    Filed: December 2, 2022
    Publication date: July 6, 2023
    Inventors: Eui Myeong CHO, Ho Cheol KANG, Jae Hyun KOH, Seok Young YOON
  • Patent number: 11501698
    Abstract: A display device includes a pixel. The pixel includes an emission unit and a pixel circuit. The pixel circuit to provide a first driving current to the emission unit in a first current flowing direction in a first mode, and to provide a second driving current to the emission unit in a second current flowing direction different from the first current flowing direction in a second mode. The emission unit includes a first electrode and a second electrode spaced from each other, a first light emitting element connected between the first electrode and the second electrode in the first current flowing direction, and a second light emitting element connected between the first electrode and the second electrode in the second current flowing direction.
    Type: Grant
    Filed: July 30, 2021
    Date of Patent: November 15, 2022
    Assignee: Samsung Display Co., Ltd.
    Inventors: Eui Myeong Cho, Ho Cheol Kang, Seok Young Yoon, Dae Gwang Jang