Patents by Inventor Janghoon Song

Janghoon Song 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: 20240153755
    Abstract: A method of manufacturing a semiconductor device includes: forming a pattern formation material layer on a substrate; forming a photoresist on the pattern formation material layer; exposing and developing the photoresist to form a photoresist pattern; performing a first deionized water cleaning on the photoresist pattern; cleaning the photoresist pattern with a cleaning solution including a surfactant; and performing a second deionized water cleaning on the photoresist pattern.
    Type: Application
    Filed: May 22, 2023
    Publication date: May 9, 2024
    Inventors: JIEUN LEE, JINPYOUNG KIM, JIEUN SONG, JANGHOON KIM, WOOJIN JUNG
  • Publication number: 20240152043
    Abstract: A method of manufacturing an extreme ultraviolet mask including preparing a preliminary layout, forming a plurality of preliminary target patterns by using a plurality of preliminary spacer patterns formed by using the preliminary layout, evaluating presence or absence of an abnormal target pattern among the plurality of preliminary target patterns, preparing a layout configured to form a plurality of spacer patterns by modifying the preliminary layout when the plurality of preliminary target patterns include the abnormal target pattern, and manufacturing an extreme ultraviolet mask with the layout to form a plurality of target patterns by using the plurality of spacer patterns, wherein, the plurality of preliminary spacer patterns extend in one direction.
    Type: Application
    Filed: October 19, 2023
    Publication date: May 9, 2024
    Inventors: Minseung SONG, Janghoon KIM, Sangho YUN, Chan HWANG
  • Patent number: 11783750
    Abstract: A method for driving an organic light emitting diode (OLED) display having a first area with a first pixel density and a second area with a second pixel density higher than the first pixel density, the method includes receiving image content that specifies a grayscale value for both a first pixel in the first area and a second pixel in the second area, providing, based on the grayscale value, a first voltage to the first pixel in the first area, and providing, based on the grayscale value, a second voltage that is different from the first voltage to the second pixel in the second area, where the second voltage causes the second pixel to emit light less brightly than the first voltage causes the first pixel to emit light.
    Type: Grant
    Filed: July 29, 2020
    Date of Patent: October 10, 2023
    Assignee: Google LLC
    Inventors: Sangmoo Choi, Janghoon Song, Taesung Kim
  • Publication number: 20230029925
    Abstract: A display can include a plurality of pixels arranged in a matrix of rows and columns, and a gate driver circuit including a plurality of row drivers configured as a shift register that sequentially and individually addresses the rows. The display panel can also include a first clock circuit configured to provide a first set of clock signals to a first portion of the row drivers to address a respective first portion of the rows. The first clock circuit can include a signal distribution circuit having a first input impedance. The display panel can also include a second clock circuit configured to provide a second set of clock signals to a second portion of the row drivers to address a respective second portion of the rows. The second clock circuit can include a signal distribution circuit having a second input impedance that is matched with the first input impedance.
    Type: Application
    Filed: August 24, 2020
    Publication date: February 2, 2023
    Inventors: Sangmoo Choi, Janghoon Song
  • Publication number: 20220327999
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for driving a display with an array of light-emitting pixels. The pixels are arranged in a plurality of rows. The array includes two or more independently drivable areas. Each area includes two or more adjacent rows. The method includes, during an image frame, while operating in a first mode of operation, activating a first shift register circuit addressing only rows of pixels in a first area of the independently drivable areas. Activating the first register circuit illuminates one or more pixels in the first area. The method also includes, during the image frame, while operating in the first mode of operation, deactivating a second shift register circuit addressing only rows of pixels in a second area of the independently drivable areas. Deactivating the second register circuit maintains every pixel in the second area unilluminated during the image frame.
    Type: Application
    Filed: November 8, 2019
    Publication date: October 13, 2022
    Inventors: Sangmoo Choi, Janghoon Song, Wonjae Choi
  • Publication number: 20220309983
    Abstract: A method for driving an organic light emitting diode (OLED) display having a first area with a first pixel density and a second area with a second pixel density higher than the first pixel density, the method includes receiving image content that specifies a grayscale value for both a first pixel in the first area and a second pixel in the second area, providing, based on the grayscale value, a first voltage to the first pixel in the first area, and providing, based on the grayscale value, a second voltage that is different from the first voltage to the second pixel in the second area, where the second voltage causes the second pixel to emit light less brightly than the first voltage causes the first pixel to emit light.
    Type: Application
    Filed: July 29, 2020
    Publication date: September 29, 2022
    Inventors: Sangmoo Choi, Janghoon Song, Taesung Kim
  • Patent number: 9966007
    Abstract: Discussed are an organic light emitting display which can reduce flicker, along with power consumption, and a driving method thereof. In a low-power operation mode of the organic light emitting display, at least one holding frame is placed between writing frames in which image data is written, the output of the source driver is enabled during the writing frames, the output of the source driver is disabled during the holding frames, and the emission driver is controlled during the holding frames to increase the toggle frequency of the emission signal to be higher than or equal to N times the frame frequency (N is a positive integer greater than or equal to 2). The driving method can reduce the perceived flicker.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: May 8, 2018
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Hyungnyuck Cho, Janghoon Song
  • Patent number: 9892678
    Abstract: Provided is an OLED display device that is in a black mode in which a threshold voltage of a driving TFT need not accurately be sensed. Further, a low voltage value of zero or less is constantly and continuously supplied to a data line during an initialization period, a sampling period, and a programming period in a pixel. As a result, when the pixel is driven in the black mode, a reference voltage and a data voltage having different values are not alternately supplied to the data line to minimize power consumption.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: February 13, 2018
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Janghoon Song, SeokHee Jeong, ChangHeon Kang, Jung-Min Lee
  • Publication number: 20170004766
    Abstract: Discussed are an organic light emitting display which can reduce flicker, along with power consumption, and a driving method thereof. In a low-power operation mode of the organic light emitting display, at least one holding frame is placed between writing frames in which image data is written, the output of the source driver is enabled during the writing frames, the output of the source driver is disabled during the holding frames, and the emission driver is controlled during the holding frames to increase the toggle frequency of the emission signal to be higher than or equal to N times the frame frequency (N is a positive integer greater than or equal to 2). The driving method can reduce the perceived flicker.
    Type: Application
    Filed: June 23, 2016
    Publication date: January 5, 2017
    Applicant: LG DISPLAY CO., LTD.
    Inventors: Hyungnyuck CHO, Janghoon SONG
  • Patent number: 9490312
    Abstract: There is provided a flexible display having a plurality of innovations configured to allow bending of a portion or portions to reduce apparent border size and/or utilize the side surface of an assembled flexible display.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: November 8, 2016
    Assignee: LG Display Co., Ltd.
    Inventors: JungJoo Lee, Janghoon Song
  • Publication number: 20160181345
    Abstract: There is provided a flexible display having a plurality of innovations configured to allow bending of a portion or portions to reduce apparent border size and/or utilize the side surface of an assembled flexible display.
    Type: Application
    Filed: December 22, 2014
    Publication date: June 23, 2016
    Inventors: JungJoo Lee, Janghoon Song
  • Publication number: 20160171930
    Abstract: Provided is an OLED display device that is in a black mode in which a threshold voltage of a driving TFT need not accurately be sensed. Further, a low voltage value of zero or less is constantly and continuously supplied to a data line during an initialization period, a sampling period, and a programming period in a pixel. As a result, when the pixel is driven in the black mode, a reference voltage and a data voltage having different values are not alternately supplied to the data line to minimize power consumption.
    Type: Application
    Filed: December 10, 2015
    Publication date: June 16, 2016
    Applicant: LG DISPLAY CO., LTD.
    Inventors: Janghoon SONG, SeokHee JEONG, ChangHeon KANG, Jung-Min LEE
  • Publication number: 20160172428
    Abstract: There is provided a flexible display having a plurality of innovations configured to allow bending of a portion or portions to reduce apparent border size and/or utilize the side surface of an assembled flexible display.
    Type: Application
    Filed: December 11, 2014
    Publication date: June 16, 2016
    Inventors: Janghoon Song, ChangHoon Jeon, JungJoo Lee
  • Patent number: 7914204
    Abstract: A temperature sensor includes: a first oscillator that generates a first frequency signal; a second oscillator that generates a second frequency signal; a multiplexer that selectively passes the first frequency signal and the second frequency signal; and a frequency-to-digital converter that converts a frequency difference between the first frequency signal and the second frequency signal into a digital code.
    Type: Grant
    Filed: April 1, 2008
    Date of Patent: March 29, 2011
    Assignee: Korea University Industrial & Academic Collaboration Foundation
    Inventors: Chulwoo Kim, Janghoon Song, Gilwon Yoon, Sangdon Jung
  • Publication number: 20080238563
    Abstract: A temperature sensor includes: a first oscillator that generates a first frequency signal; a second oscillator that generates a second frequency signal; a multiplexer that selectively passes the first frequency signal and the second frequency signal; and a frequency-to-digital converter that converts a frequency difference between the first frequency signal and the second frequency signal into a digital code.
    Type: Application
    Filed: April 1, 2008
    Publication date: October 2, 2008
    Applicant: Korea University Induxtrial & Academic Collaboration Foundation
    Inventors: Chulwoo Kim, Janghoon Song, Gilwon Yoon, Sangdon Jung