Patents by Inventor Keitaro Yamashita

Keitaro Yamashita 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).

  • Patent number: 11978743
    Abstract: The present disclosure relates to a TFT array substrate and a display panel including the same.
    Type: Grant
    Filed: November 11, 2021
    Date of Patent: May 7, 2024
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Keitaro Yamashita, Yoshihiro Morimoto
  • Publication number: 20230335055
    Abstract: The present disclosure relates to the field of display technology, and provides a display device and a driving method therefor. The driving method includes: providing a display device including a plurality of sub-pixels, each sub-pixel including an OLED light-emitting element, a light-emitting control transistor configured to transmit a driving current to the OLED light-emitting element, and a reset transistor coupled to an anode of the OLED light-emitting element; inputting a periodic cut-off signal to the light-emitting control transistor; determining the effective light-emitting phase of each frame period for the sub-pixel; and during the effective light-emitting phase of each frame period for the sub-pixel, inputting a reset signal to the reset transistor corresponding to one or more cut-off signal.
    Type: Application
    Filed: June 18, 2021
    Publication date: October 19, 2023
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: Keitaro YAMASHITA, JehYen KANG, Xiangshu LI, Fei SHEN
  • Patent number: 11587504
    Abstract: A driving method includes: generating and outputting a frame image signal to an organic light emitting device, wherein the frame image signal includes an active data region and a blank region based on a time sequence; in the active data region of the frame image signal, using a timing controller to write a data voltage into the gate of the thin film transistor, store it in a storage capacitor, and apply it to the organic light emitting device through the thin film transistor; and in response to reaching the blank region of the frame image signal as determined by the timing controller, changing the first voltage at the cathode of the organic light emitting device to compensate the operating current of the organic light emitting device.
    Type: Grant
    Filed: July 21, 2021
    Date of Patent: February 21, 2023
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Xiangshu Li, JehYen Kang, Fei Shen, Keitaro Yamashita
  • Patent number: 11580902
    Abstract: The present disclosure relates to the technical field of display panels, in particular to a driving method and driving apparatus of a display panel. The driving method may include in response to detecting that the display panel is switched from a dynamic picture to a static picture, generating a refresh rate adjustment instruction; according to the refresh rate adjustment instruction, switching the picture refresh rate of the display panel from a first picture refresh rate to a second picture refresh rate and generating a voltage adjustment instruction; obtaining a target cathode power supply voltage matching the second picture refresh rate; and based on the voltage adjustment instruction and the target cathode power supply voltage, adjusting the display panel to change a working current of each pixel in the display panel.
    Type: Grant
    Filed: January 10, 2022
    Date of Patent: February 14, 2023
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Zhouhui Xia, Xiangyu Jiang, JehYen Kang, Keitaro Yamashita
  • Patent number: 11568823
    Abstract: The present disclosure relates to the field of display technology, and provides driving methods of a display panel and a display device.
    Type: Grant
    Filed: August 10, 2021
    Date of Patent: January 31, 2023
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Fei Shen, Xiangshu Li, Xiangyu Jiang, JehYen Kang, Shaodong Ma, Keitaro Yamashita
  • Patent number: 11468813
    Abstract: The present disclosure provides a method and device for driving a display panel. The method includes steps of: presetting a mapping database of correspondence between each of first voltages and a respective one of image refresh rates; sending a refresh rate adjustment instruction to a timing controller; switching the image refresh rate from the first image refresh rate to the second image refresh rate according to the refresh rate adjustment instruction, and sending a voltage adjustment instruction to a power driving chip; obtaining the first voltage according to the voltage adjustment instruction and the mapping database; obtaining the pixel driving voltage according to the preset correspondence between the first voltage and the pixel driving voltage; and adjusting the display panel according to the pixel driving voltage to change the operating current of each pixel.
    Type: Grant
    Filed: July 22, 2021
    Date of Patent: October 11, 2022
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: JehYen Kang, Xiangshu Li, Zhouhui Xia, Keitaro Yamashita
  • Patent number: 11448931
    Abstract: The present disclosure relates to the field of display technology, and provides a method for repairing broken line, an array substrate, and an active matrix display device.
    Type: Grant
    Filed: December 3, 2020
    Date of Patent: September 20, 2022
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Keitaro Yamashita, Shanglong Wang, Ruili Wang, Chihkang Chen
  • Publication number: 20220223105
    Abstract: The present disclosure relates to the technical field of display panels, in particular to a driving method and driving apparatus of a display panel. The driving method may include in response to detecting that the display panel is switched from a dynamic picture to a static picture, generating a refresh rate adjustment instruction; according to the refresh rate adjustment instruction, switching the picture refresh rate of the display panel from a first picture refresh rate to a second picture refresh rate and generating a voltage adjustment instruction; obtaining a target cathode power supply voltage matching the second picture refresh rate; and based on the voltage adjustment instruction and the target cathode power supply voltage, adjusting the display panel to change a working current of each pixel in the display panel.
    Type: Application
    Filed: January 10, 2022
    Publication date: July 14, 2022
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: Zhouhui XIA, Xiangyu JIANG, JehYen KANG, Keitaro YAMASHITA
  • Publication number: 20220223093
    Abstract: The present disclosure relates to the technical field of display panels and provides a driving method and a driving system of a display panel. The driving method of a display panel includes detecting a refresh rate of each frame of the display panel; in response to that the refresh rate of a current frame of the display panel changes relative to the refresh rate of a previous frame of the current frame, generating an adjustment instruction of an initialization voltage; determining a target initialization voltage of the current frame based on the adjustment instruction of the initialization voltage; and at a reset phase of the current frame, initializing a pixel drive circuit of the display panel with the target initialization voltage, so that a difference value between a working current of the pixel drive circuit in the current frame and a working current of the pixel drive circuit in the previous frame is less than a preset threshold.
    Type: Application
    Filed: January 10, 2022
    Publication date: July 14, 2022
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: Linfan TIAN, Xiangyu JIANG, JehYen KANG, Keitaro YAMASHITA
  • Publication number: 20220173133
    Abstract: The present disclosure relates to a TFT array substrate and a display panel including the same.
    Type: Application
    Filed: November 11, 2021
    Publication date: June 2, 2022
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: Keitaro YAMASHITA, Yoshihiro MORIMOTO
  • Patent number: 11335271
    Abstract: A pixel circuit, a driving method and a display device are provided. The pixel circuit includes: a data writing unit, a driving unit, a light emitting unit and an initialization unit. The initialization unit is configured to initialize a second node with an initialization voltage. The data writing unit is configured to set voltage of a first node to the voltage of a data signal and update voltage of the second node. The driving unit is configured to drive the light emitting unit to emit light according to a control signal. Due to the second node being initialized and compensated by the initialization unit, the storage capacitor leakage paths and the electric leakage of the storage capacitor during the light emitting stage are reduced, thus improving the quality of the displayed image.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: May 17, 2022
    Assignee: EverDisplay Optronics (Shanghai) Co., Ltd.
    Inventors: Keitaro Yamashita, Lina Xiao
  • Publication number: 20220051599
    Abstract: The present disclosure provides a method and device for driving a display panel. The method includes steps of: presetting a mapping database of correspondence between each of first voltages and a respective one of image refresh rates; sending a refresh rate adjustment instruction to a timing controller; switching the image refresh rate from the first image refresh rate to the second image refresh rate according to the refresh rate adjustment instruction, and sending a voltage adjustment instruction to a power driving chip; obtaining the first voltage according to the voltage adjustment instruction and the mapping database; obtaining the pixel driving voltage according to the preset correspondence between the first voltage and the pixel driving voltage; and adjusting the display panel according to the pixel driving voltage to change the operating current of each pixel.
    Type: Application
    Filed: July 22, 2021
    Publication date: February 17, 2022
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: JehYen KANG, Xiangshu LI, Zhouhui XIA, Keitaro YAMASHITA
  • Publication number: 20220051630
    Abstract: The present disclosure relates to the field of display technology, and provides driving methods of a display panel and a display device.
    Type: Application
    Filed: August 10, 2021
    Publication date: February 17, 2022
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: Fei SHEN, Xiangshu LI, Xiangyu JIANG, JehYen KANG, Shaodong MA, Keitaro YAMASHITA
  • Publication number: 20220044628
    Abstract: The present disclosure provides a driving method of a display device and a display device. The driving method includes: generating and outputting a frame image signal to an organic light emitting device, wherein the frame image signal includes an active data region and a blank region based on a time sequence; in the active data region of the frame image signal, using a timing controller to write a data voltage into the gate of the thin film transistor, store it in a storage capacitor, and apply it to the organic light emitting device through the thin film transistor; and in response to reaching the blank region of the frame image signal as determined by the timing controller, changing the first voltage at the cathode of the organic light emitting device to compensate the operating current of the organic light emitting device.
    Type: Application
    Filed: July 21, 2021
    Publication date: February 10, 2022
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: Xiangshu LI, JehYen KANG, Fei SHEN, Keitaro YAMASHITA
  • Patent number: 11227551
    Abstract: The present disclosure provides a driving method and system for an OLED display panel. The driving method for the OLED display panel includes: controlling a gate line driving circuit of the display panel for each frame image to sequentially output a scanning signal to each gate line of the display panel; and when the gate line driving circuit of the display panel starts to output the scanning signal to one gate line, timing from a starting scanning time of the same scanning gate line; and after the scanning time of the current scanning gate line reaches a preset fixed scanning time, controlling the gate line driving circuit of the display panel to stop outputting the scanning signal to the current scanning gate line. Therefore, the present disclosure does not need to change the gamma curve when the refresh frequency is changed, and screen flicker will not occur, and a seamless dynamic refresh switching of the display panel is realized.
    Type: Grant
    Filed: April 21, 2020
    Date of Patent: January 18, 2022
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Keitaro Yamashita, Shaodong Ma, Shanglong Wang, Fei Shen
  • Patent number: 11210999
    Abstract: A driving method includes: determining a starting luminance LS of a to-be-adjusted frame image; determining an average luminance LAVE(n) of the to-be-adjusted frame image during a nth duty period; determining a reference luminance flow rate ?L that indicates a current change rate of a storage capacitor storing a data signal for a display element; determining a time length TF of a reference frame image; determining a number k of black strips in the to-be-adjusted frame image; calculating a duty ratio of a pulse driving signal of the to-be-adjusted frame image during the nth duty period based on the starting luminance LS, the average luminance LAVE(n), the reference luminance flow rate ?L, the time length TF, and the number k of the black strips; and driving to display the to-be-adjusted frame image by the adjusted pulse driving signal.
    Type: Grant
    Filed: September 22, 2020
    Date of Patent: December 28, 2021
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Keitaro Yamashita, Shaodong Ma, Shanglong Wang, Fei Shen
  • Patent number: 11158238
    Abstract: The present disclosure relates to the technical field of display devices, and provides a display panel and a driving method thereof. The display panel includes: a plurality of data lines, each of the data lines including a first segment line and a second segment line, every adjacent n+1 of the data lines forming a data line group, each data line group including a first data line having a connection line and n second data lines; a DEMUX circuit including n gating control lines, each of the gating control lines being in turn connected to the first segment line of the second data lines in each data line group, and the first segment line of each of the data lines in each data line group being connected to each other; and a driving IC connected to the second segment line of each of the data lines and the DEMUX circuit.
    Type: Grant
    Filed: November 19, 2020
    Date of Patent: October 26, 2021
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Keitaro Yamashita, Lina Xiao
  • Patent number: 11158249
    Abstract: The present disclosure provides a display driving device, method and an OLED display device, and the display driving device includes: an interface module, configured to receive image data of a display chip and sending a first scanning signal in each of frame periods; a frame buffer, configured to send a buffer signal after receiving the first scanning signal from the interface module; a timing controller, configured to send a second scanning signal to the display panel according to the buffer signal sent by the frame buffer; in response to the display driving device is switched from a screen self-refresh mode to a vertical synchronization mode, the delay time between the second scanning signal and the buffer signal gradually decreases, one frame period by one frame period, to zero or gradually increases, one frame period by one frame period, to duration of one frame period.
    Type: Grant
    Filed: November 6, 2020
    Date of Patent: October 26, 2021
    Assignee: Everdisplay Optronics (Shanghai) Co., Ltd
    Inventors: Keitaro Yamashita, Chungche Tsou, Yinan Liang, Shaodong Ma
  • Publication number: 20210173268
    Abstract: The present disclosure relates to the field of display technology, and provides a method for repairing broken line, an array substrate, and an active matrix display device.
    Type: Application
    Filed: December 3, 2020
    Publication date: June 10, 2021
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: Keitaro YAMASHITA, Shanglong WANG, Ruili WANG, Chihkang CHEN
  • Publication number: 20210158743
    Abstract: The present disclosure relates to the technical field of display devices, and provides a display panel and a driving method thereof. The display panel includes: a plurality of data lines, each of the data lines including a first segment line and a second segment line, every adjacent n+1 of the data lines forming a data line group, each data line group including a first data line having a connection line and n second data lines; a DEMUX circuit including n gating control lines, each of the gating control lines being in turn connected to the first segment line of the second data lines in each data line group, and the first segment line of each of the data lines in each data line group being connected to each other; and a driving IC connected to the second segment line of each of the data lines and the DEMUX circuit.
    Type: Application
    Filed: November 19, 2020
    Publication date: May 27, 2021
    Applicant: Everdisplay Optronics (Shanghai) Co.,Ltd.
    Inventors: Keitaro YAMASHITA, Lina XIAO