Patents by Inventor Ji-Hyun Ka

Ji-Hyun Ka 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: 20220130302
    Abstract: An exemplary embodiment of the present inventive concept provides a display device including: a display area where an image is displayed; a peripheral area disposed outside the display area; a hole area disposed within the display area; a hole crack detection line disposed adjacent to the hole area to surround the hole area and having a first end and a second end that is separated from the first end; a first detection line extending from the peripheral area and connected to the hole crack detection line to constitute a first closed circuit; a second detection line extending from the peripheral area and connected to the hole crack detection line to constitute a second closed circuit; and a circuit portion connected to the first detection line and the second detection line
    Type: Application
    Filed: January 7, 2022
    Publication date: April 28, 2022
    Inventors: Kwang Sae LEE, Won Kyu KWAK, Ji-Hyun KA, Gyeong Nam BANG, Ki Myeong EOM
  • Publication number: 20220122537
    Abstract: The present disclosure relates to a pixel displaying an image. A pixel includes an organic light emitting diode, a first transistor controlling an amount of current flowing from a first driving power supply to a second driving power supply via the organic light emitting diode in response to a voltage of a first node; a storage capacitor connected between the first node and the first driving power supply; a second transistor connected between a data line and the first node and turned on when a scan signal is supplied to a first scan line, and an auxiliary transistor connected between the second transistor and the data line and turned on when a scan signal is supplied to a second scan line. The second transistor and the auxiliary transistor have an overlapping turn-on period, and the second transistor is turned off before the auxiliary transistor is turned off.
    Type: Application
    Filed: January 3, 2022
    Publication date: April 21, 2022
    Inventors: Tae Hoon KIM, Ji Hyun KA, Seung Kyu LEE
  • Publication number: 20220085136
    Abstract: An organic light emitting diode display includes a substrate, a semiconductor layer on the substrate, the semiconductor layer including a doped area and an undoped area, a first insulation layer that covers the semiconductor layer, a first conductor on the first insulation layer, a second insulation layer that covers the first conductor, a second conductor on the second insulation layer, a third insulation layer that covers the second conductor, and a third conductor on the third insulation layer, wherein, in the semiconductor layer that overlaps the first conductor, the doped area is between undoped areas.
    Type: Application
    Filed: November 22, 2021
    Publication date: March 17, 2022
    Applicant: Samsung Display Co., Ltd.
    Inventors: Sung Hwan KIM, Won Kyu KWAK, Sang Moo CHOI, Ji-Hyun KA, Chul Kyu KANG, Dong Wook KIM, Won Se LEE
  • Publication number: 20220085140
    Abstract: A display device includes a substrate including a first pixel region, a second pixel region having an area smaller than that of the first pixel region, and a peripheral region surrounding the first pixel region and the second pixel region, a second pixel provided in the second pixel region, a second line connected to the second pixel, an extension line extended to the peripheral region, a dummy part located in the peripheral region to overlap with the extension line, a power line connected to the first and second pixel regions, and a connection line located in the peripheral region to be connected to the dummy part, the connection line being electrically connected to a portion of the second pixel region, wherein the second pixel region includes a first sub-pixel region connected to the connection line and a second sub-pixel region except the first sub-pixel region.
    Type: Application
    Filed: November 29, 2021
    Publication date: March 17, 2022
    Inventors: Keon Woo KIM, Ji Hyun KA, Tae Hoon KWON, Ho Kyoon KWON, Min Ku LEE, Zail LHEE, Jin Tae JEONG, Seung Ji CHA, Byung Du AHN, Jeong Ho LEE
  • Patent number: 11257896
    Abstract: A display device is disclosed, and the display device includes a substrate including first to third display regions, the second and the third display regions being spaced from each other, each of the second and third display regions having an area smaller than that of the first display region and being continuous to the first display region, first to third pixels in the first to third display regions, first to third lines connected to the first to third pixels, and a dummy part configured to compensate for a difference between a load value of the first lines and load values of the second and third lines, wherein the second display region includes a first sub-region adjacent to the first display region and a second sub-region spaced from the first display region, and the third display region includes a third sub-region adjacent to the first display region and a fourth sub-region spaced from the first display region.
    Type: Grant
    Filed: April 27, 2020
    Date of Patent: February 22, 2022
    Assignee: Samsung Display Co., Ltd.
    Inventors: Hyung Jun Park, Yang Wan Kim, Byung Sun Kim, Su Jin Lee, Jae Yong Lee, Ji Hyun Ka, Tae Hoon Kwon, Jin Tae Jeong, Seung Ji Cha
  • Patent number: 11257422
    Abstract: A display device includes a power supply to supply a first initialization power source to the pixels through a first initialization and to supply a second initialization power source to the pixels through a second power line.
    Type: Grant
    Filed: October 22, 2020
    Date of Patent: February 22, 2022
    Assignee: Samsung Display Co., Ltd.
    Inventors: Kyong Hwan Oh, Jin Tae Jeong, Ji Hyun Ka, Won Kyu Kwak, Hyung Jun Park, Chang Soo Pyon, Ji Eun Lee, Hai Jung In, Won Mi Hwang
  • Patent number: 11250745
    Abstract: An exemplary embodiment of the present inventive concept provides a display device including: a display area where an image is displayed; a peripheral area disposed outside the display area; a hole area disposed within the display area; a hole crack detection line disposed adjacent to the hole area to surround the hole area and having a first end and a second end that is separated from the first end; a first detection line extending from the peripheral area and connected to the hole crack detection line to constitute a first closed circuit; a second detection line extending from the peripheral area and connected to the hole crack detection line to constitute a second closed circuit; and a circuit portion connected to the first detection line and the second detection line.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: February 15, 2022
    Inventors: Kwang Sae Lee, Won Kyu Kwak, Ji-Hyun Ka, Gyeong Nam Bang, Ki Myeong Eom
  • Publication number: 20220044634
    Abstract: A display panel of an OLED display device includes a first pixel configured to emit first color light, a second pixel configured to emit second color light, and a third pixel configured to emit third color light. Each of the first, second and third pixels includes at least two transistors, at least one capacitor and an organic light emitting diode. At least one of at least two transistors or at least one capacitor included in the third pixel has a size different from a size of a corresponding one at least two transistors or at least one capacitor included in the first pixel or the second pixel.
    Type: Application
    Filed: March 12, 2021
    Publication date: February 10, 2022
    Inventors: JI-HYUN KA, NACKHYEON KEUM, KIMYEONG EOM
  • Publication number: 20220039258
    Abstract: A display device is provided. The display device comprises a display panel including a plurality of signal pads and one or more dummy pads, and at least one flexible wiring board providing signals to the signal pads, wherein a maximum bias period of signals provided to a pair of adjacent signal pads with at least one dummy pad interposed therebetween is longer than a maximum bias period of signals provided to a pair of adjacent signal pads with no dummy pad disposed therebetween.
    Type: Application
    Filed: October 14, 2021
    Publication date: February 3, 2022
    Inventors: TAE HOON KWON, JI HYUN KA, BYUNG SUN KIM, YANG WAN KIM, HYUNG JUN PARK, SU JIN LEE, JAE YONG LEE, JIN TAE JEONG, SEUNG JI CHA
  • Patent number: 11238794
    Abstract: A display apparatus includes a substrate which includes a first pixel area and a second pixel area. A third pixel area is spaced apart from the second pixel area. A notch peripheral area is adjacent to the first, second and third pixel areas. A plurality of pixels are provided in the first, second and third pixel areas. A first scan line is disposed on the substrate. The first scan line includes a first portion disposed in the second pixel area, a second portion disposed in the third pixel area, and a third portion which connects the first portion to the second portion. The third portion is disposed in the notch peripheral area. A second scan line is disposed on the substrate in the first pixel area. A surface area of the first scan line is from about 90% to about 110% of a surface area of the second scan line.
    Type: Grant
    Filed: September 4, 2020
    Date of Patent: February 1, 2022
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Ji-Hyun Ka, Taehoon Kwon, Kimyeong Eom
  • Patent number: 11217165
    Abstract: The present disclosure relates to a pixel displaying an image. A pixel includes an organic light emitting diode, a first transistor controlling an amount of current flowing from a first driving power supply to a second driving power supply via the organic light emitting diode in response to a voltage of a first node; a storage capacitor connected between the first node and the first driving power supply; a second transistor connected between a data line and the first node and turned on when a scan signal is supplied to a first scan line, and an auxiliary transistor connected between the second transistor and the data line and turned on when a scan signal is supplied to a second scan line. The second transistor and the auxiliary transistor have an overlapping turn-on period, and the second transistor is turned off before the auxiliary transistor is turned off.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: January 4, 2022
    Inventors: Tae Hoon Kim, Ji Hyun Ka, Seung Kyu Lee
  • Patent number: 11217185
    Abstract: A display device includes first and second pixel areas spaced apart from each other so that corresponding scan lines are separate from each other, a first non-pixel area at a periphery of the first pixel area, a second non-pixel area at a periphery of the second pixel area and opposite to the first non-pixel area with at least one pixel area interposed therebetween, first scan lines in the first pixel area, second scan lines in the second pixel area, a first scan driver in the first non-pixel area and connected to the first scan lines, a second scan driver in the second non-pixel area and connected to the second scan lines, first wires in the first non-pixel area and connected to the first scan driver, second wires in the second non-pixel area and connected to the second scan driver; and connecting wires connecting the first wires and second wires.
    Type: Grant
    Filed: February 1, 2021
    Date of Patent: January 4, 2022
    Inventors: Jin Tae Jeong, Ji Hyun Ka, Tae Hoon Kwon, Min Ku Lee, Seung Ji Cha
  • Publication number: 20210390907
    Abstract: A pixel includes a plurality of transistors and an organic light emitting diode, in which the transistors include a first transistor to control an amount of current flowing to the organic light emitting diode and additional transistors are connected to the first transistor or the organic light emitting diode, the first transistor is a Low Temperature Poly-Silicon (LTPS) thin film transistor, and one or more of the other transistors are oxide semiconductor transistors.
    Type: Application
    Filed: August 30, 2021
    Publication date: December 16, 2021
    Inventors: Ji Hyun KA, Won Kyu Kwak, Han Sung Bae
  • Publication number: 20210383751
    Abstract: A stage includes an output, an input, signal processors, and a stabilizer. The output supplies a voltage of a first or second power source to an output terminal based on voltages of first and second nodes. The input controls voltages of third and fourth nodes based on signals to a first and second input terminals. A first signal processor controls the voltage of the first node based on the voltage of the second node. A second signal processor is connected to a fifth node and controls the voltage of the first node based on a signal to a third input terminal. A third signal processor controls the voltage of the fourth node based on the voltage of the third node and the signal to the third input terminal. The stabilizer is connected between the second signal processor and input to control voltage drop widths of the third and fourth nodes.
    Type: Application
    Filed: August 20, 2021
    Publication date: December 9, 2021
    Inventors: Seung Kyu Lee, Seung Ji Cha, Ji Hyun Ka, Tae Hoon Kwon, Min Ku Lee, Jin Tae Jeong
  • Patent number: 11195896
    Abstract: An organic light emitting diode display includes a substrate, a semiconductor layer on the substrate, the semiconductor layer including a doped area and an undoped area, a first insulation layer that covers the semiconductor layer, a first conductor on the first insulation layer, a second insulation layer that covers the first conductor, a second conductor on the second insulation layer, a third insulation layer that covers the second conductor, and a third conductor on the third insulation layer, wherein, in the semiconductor layer that overlaps the first conductor, the doped area is between undoped areas.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: December 7, 2021
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Sung Hwan Kim, Won Kyu Kwak, Sang Moo Choi, Ji-Hyun Ka, Chul Kyu Kang, Dong Wook Kim, Won Se Lee
  • Publication number: 20210375212
    Abstract: A display device includes: a substrate including a display area and a non-display area; pixels connected to first scan lines, second scan lines, third scan lines, and emission control lines; a first scan driver supplying a first scan signal to the first scan lines; a second scan driver supplying a second scan signal to some of the second scan lines and supplying a third scan signal to the third scan lines; an emission driver supplying an emission control signal to the emission control lines; a first pad and a second pad provided in the non-display area; a first power line connected to the first pad, the first power line transferring a first voltage to the first scan driver and the emission driver; and a second power line connected to the second pad, the second power line transferring a second voltage to the second scan driver.
    Type: Application
    Filed: January 11, 2021
    Publication date: December 2, 2021
    Inventors: Tae Hoon KWON, Ji Hyun KA, Nack Hyeon KEUM, Jae Jin SONG, Kwang Sae LEE
  • Patent number: 11189680
    Abstract: A display device includes a substrate including a first pixel region, a second pixel region having an area smaller than that of the first pixel region, and a peripheral region surrounding the first pixel region and the second pixel region, a second pixel provided in the second pixel region, a second line connected to the second pixel, an extension line extended to the peripheral region, a dummy part located in the peripheral region to overlap with the extension line, a power line connected to the first and second pixel regions, and a connection line located in the peripheral region to be connected to the dummy part, the connection line being electrically connected to a portion of the second pixel region, wherein the second pixel region includes a first sub-pixel region connected to the connection line and a second sub-pixel region except the first sub-pixel region.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: November 30, 2021
    Assignee: Samsung Display Co., Ltd.
    Inventors: Keon Woo Kim, Ji Hyun Ka, Tae Hoon Kwon, Ho Kyoon Kwon, Min Ku Lee, Zail Lhee, Jin Tae Jeong, Seung Ji Cha, Byung Du Ahn, Jeong Ho Lee
  • Patent number: 11189204
    Abstract: A display device includes a peripheral area around a display area, a plurality of pixels in the display area, and a plurality of signal lines connected to the pixels. The signal lines include a plurality of data lines connected to the pixels, a crack detection line connected to first data lines among the data lines through a first transistor, and a control line connected to a gate of the first transistor. The crack detection line is in the peripheral area.
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: November 30, 2021
    Assignee: Samsung Display Co., Ltd.
    Inventors: Seung-Kyu Lee, Tae Hoon Kwon, Ji-Hyun Ka, Won Kyu Kwak, Dong Soo Kim, Han-Sung Bae, Hey Jin Shin, Seung Ji Cha
  • Publication number: 20210366408
    Abstract: An emission driver includes a plurality of stages. A stage of the plurality of stages receives a start signal, a first clock signal, a second clock signal, a protection signal, a first gate power voltage and a second gate power voltage and outputs an emission signal. The stage of the plurality of stages includes a pull-up switching element connected between a first gate power voltage terminal which receives the first gate power voltage and an emission signal output terminal which outputs the emission signal, a pull-down switching element connected between a second gate power voltage terminal which receives the second gate power voltage and the emission signal output terminal and a protection switching element which applies the first gate power voltage to a control electrode of the pull-down switching element in response to the protection signal.
    Type: Application
    Filed: May 17, 2021
    Publication date: November 25, 2021
    Inventors: HAI-JUNG IN, KIMYEONG EOM, JI-HYUN KA
  • Publication number: 20210366402
    Abstract: A gate driver includes a stage configured to output a gate signal, the stage including an input part configured to control a voltage of a first node and a voltage of a second node based on signals supplied to a first input terminal and a second input terminal, an output part configured to supply a voltage of a first power source or a voltage of a second power source as the gate signal to an output terminal based on a voltage of a third node and a voltage of a fourth node, a first signal processing part configured to supply the voltage of the second power source to the fourth node based on the voltage of the first node, or to electrically connect the second node and the fourth node through a fifth node based on a signal supplied to a third input terminal, and a second signal processing part including a first transistor connected between the third node and a sixth node to control the voltage of the third node based on an operation of the first transistor.
    Type: Application
    Filed: April 30, 2021
    Publication date: November 25, 2021
    Inventors: Hai Jung IN, Ji Hyun KA, Tae Hoon KWON, Ki Myeong EOM, Chae Han HYUN