Patents Assigned to Joled, Inc.
  • Patent number: 11004392
    Abstract: A method for driving a display device includes stopping a display operation of a display based on a presence or absence of a signal indicating an off operation of a main power switch of the display. The method further includes applying a recovery voltage across a gate and source of a driving transistor in the display based on a threshold voltage shift of the driving transistor. The threshold voltage shift is determined during a stopped state of the display operation of the display. The stopped state of the display operation of the display occurs prior to starting the display operation of the display.
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: May 11, 2021
    Assignee: JOLED INC.
    Inventors: Hiroshi Hayashi, Shinya Ono
  • Publication number: 20210135134
    Abstract: A display device includes a flexible substrate, a display device layer, a polarizing plate, and a warpage suppressing member. The flexible substrate has a front surface on a front surface side and a back surface on a back surface side. The display device layer is provided on the front surface side of the flexible substrate and includes a self-luminescent element. The polarizing plate is opposed to the flexible substrate across the display device layer and has a predetermined dimensional change characteristic corresponding to environmental change. The warpage suppressing member is provided on the back surface side of the flexible substrate and has a dimensional change characteristic of the same tendency as the dimensional change characteristic of the polarizing plate. The warpage suppressing member is configured to cancel at least a portion of warping stress of the polarizing plate to be applied to the flexible substrate.
    Type: Application
    Filed: September 8, 2020
    Publication date: May 6, 2021
    Applicant: JOLED INC.
    Inventors: Makoto NODA, Hiroki KATO
  • Patent number: 10997912
    Abstract: A method of driving a display panel includes: correcting a gate-source voltage of a first transistor to cause the gate-source voltage of a first transistor to become closer to a threshold voltage of the first transistor; and writing a signal voltage into a gate of the first transistor by applying a plurality of voltage pulses to a gate of a second transistor. The correcting and the writing are performed in each of pixels of the display panel. The signal voltage corresponds to an image signal. The voltage pulses applied in the writing include a first voltage pulse and a second voltage pulse. The first voltage pulse is applied previous to the second voltage pulse. The second voltage pulse is applied subsequent to the first voltage pulse. A peak value of the first voltage pulse is higher than a peak value of the second voltage pulse.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: May 4, 2021
    Assignee: JOLED INC.
    Inventors: Hiroaki Ishii, Atsushi Hyodo, Teppei Isobe
  • Patent number: 10997915
    Abstract: A pixel circuit includes: one data signal line; one holding capacitor which holds a data signal transmitted through the one data signal line; one drive transistor which outputs a current in accordance with the data signal held at the one holding capacitor; three color selection lines; three color selection transistors having control terminals respectively connected to the three color selection lines that are mutually different; and three light emitting elements being connected to an output end of the current of the one drive transistor via the three color selection transistors, respectively, that are mutually different, and emitting luminescent colors that are mutually different.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: May 4, 2021
    Assignee: JOLED INC.
    Inventor: Masanori Ohara
  • Patent number: 10998526
    Abstract: An organic electroluminescence (EL) display panel includes a substrate; a plurality of organic EL elements; and a sealing layer in this order. In the organic EL display panel, the sealing layer has a three-layered structure in the order of a first sealing layer, a second sealing layer, and a third sealing layer. In the organic EL display panel, the first sealing layer, the second sealing layer, and the third sealing layer each include amorphous silicon nitride. In the organic EL display panel, when composition of the first sealing layer, composition of the second sealing layer, and composition of the third sealing layer are each indicated as SiNx, a value of x in the composition of the second sealing layer is greater than both a value of x in the composition of the first sealing layer and a value of x in the composition of the third sealing layer.
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: May 4, 2021
    Assignee: JOLED INC.
    Inventors: Keiji Horikawa, Kenji Harada, Akifumi Okigawa
  • Publication number: 20210125556
    Abstract: A pixel circuit configured to emit light based on an image signal includes: a light emitting element (organic EL element); a driver transistor configured to adjust current supplied to the light emitting element; and a write transistor connected between a signal line to which the image signal is applied and the driver transistor. The driver transistor includes: a gate electrode; a counter electrode disposed opposite the gate electrode; and a channel disposed between the gate electrode and the counter electrode. A potential applied to the counter electrode in a write period in which the write transistor conducts current in a state in which the image signal is applied to the signal line reduces a resistance value of the driver transistor to lower value than a potential applied to the counter electrode in an emission period of the light emitting element does.
    Type: Application
    Filed: August 28, 2020
    Publication date: April 29, 2021
    Applicant: JOLED INC.
    Inventor: Tetsuro YAMAMOTO
  • Publication number: 20210125555
    Abstract: A pixel circuit includes: a driver transistor that supplies a current dependent on a voltage supplied via a signal line; a write transistor connected between the signal line and a gate electrode of the driver transistor; a first organic EL element connected to one electrode of the driver transistor, the one electrode being one of a drain electrode and a source electrode of the driver transistor; a switching transistor connected to the one electrode of the driver transistor; and a second organic EL element connected to the one electrode of the driver transistor via the switching transistor. The pixel circuit performs mobility correction that corrects a mobility of the driver transistor. The switching transistor turns ON after a write operation that writes the voltage supplied via the signal line and turns OFF before an operation that performs the mobility correction of the driver transistor begins.
    Type: Application
    Filed: August 27, 2020
    Publication date: April 29, 2021
    Applicant: JOLED INC.
    Inventor: Tetsuro YAMAMOTO
  • Patent number: 10984716
    Abstract: An active-matrix display device includes a pixel matrix having a plurality of pixel cells arranged in rows and columns, and a data line disposed for each of the columns in the pixel matrix and connected to each pixel cell in a column. Each pixel cell includes a holding capacitor, including a first electrode connected to a gate of the drive transistor, a lower electrode connected to a source of the drive transistor, and an upper electrode connected to the source of the drive transistor. At least one of the lower electrode and the upper electrode protrudes toward the data line from a facing region in a plan view of the pixel matrix, such that a protruded amount, which is an amount of protrusion toward the data line, is greater than or equal to 15% of a distance between the data line and the first electrode in the facing region.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: April 20, 2021
    Assignee: JOLED INC.
    Inventor: Shigeo Homura
  • Patent number: 10986304
    Abstract: A display device includes: a panel in which plural pixels that emit lights according to a video signal are sectioned into plural areas; a light reception sensor that is arranged in each of the areas and outputs a light reception signal according to light emission luminance; and signal processing means. The area includes first and second pixel groups including at least one pixel and plural pixels other than the first pixel group, respectively. The signal processing means includes arithmetic means for outputting an arithmetic signal according to arithmetic operation of an offset value and a light reception value; converting means for outputting digital data according to the arithmetic signal; and correcting means for correcting the video signal according to the digital data and supplying the corrected video signal to the first pixel group.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: April 20, 2021
    Assignee: JOLED Inc.
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Publication number: 20210111364
    Abstract: A display panel includes: a substrate; anodes that are two-dimensionally disposed on or above the substrate; light-emitting layers that are disposed on or above the anodes in correspondence with the respective anodes; an intermediate layer that is disposed on or above the light-emitting layers and includes a fluoride of a first metal selected from alkali metals or alkaline earth metals; a functional layer that is disposed on the intermediate layer and includes a second metal selected from alkaline earth metals or rare earth metals; a cathode that is disposed on or above the functional layer; a blocking layer that is disposed on or above the cathode and includes a fluoride of a third metal selected from alkali metals or alkaline earth metals; and a sealing layer that is disposed on or above the blocking layer.
    Type: Application
    Filed: September 23, 2020
    Publication date: April 15, 2021
    Applicant: JOLED Inc.
    Inventors: Koyo SAKAMOTO, Kosuke MISHIMA
  • Publication number: 20210104193
    Abstract: A display device includes: pixels arranged in a matrix; a plurality of write signal lines for selecting a pixel row to which a data voltage is to be written; a gate driver that supplies a gate signal; a plurality of data signal lines for writing the data voltage; a data driver that supplies the data voltage; a data selector circuit that supplies, per at least one data signal line by time division, the data voltage; and a controller. Each of the pixels includes a light-emitting element, a capacitor element, and a drive transistor that supplies a current in accordance with the voltage held by the capacitor element to the light-emitting element. The controller causes the gate driver and the data driver to perform an initialization operation on pixels in a second pixel row after a period during which a write operation is performed on pixels in a first pixel row.
    Type: Application
    Filed: August 25, 2020
    Publication date: April 8, 2021
    Applicant: JOLED INC.
    Inventor: Shigeo HOMURA
  • Publication number: 20210104708
    Abstract: A self-luminous display panel including light-emitting elements 100, column banks 122Y, and a light-shielding film 133. The light-emitting elements 100 correspond one-to-one with sub-pixels 100se, each sub-pixel 100se in a pixel emitting a different color of light. The column banks 122Y are disposed between the light-emitting elements 100 in a row direction, each having an elongated shape in a column direction. The light-shielding film 133 has openings 133a at positions corresponding to the light-emitting elements 100 in plan view, downstream in a light emission direction of the light-emitting elements 100. In plan view, distances in the row direction between edges of the openings 133a of the light-shielding film 133 and defined points of the light-emitting elements 100 are different depending on light emission color of the light-emitting elements 100, due to different widths of portions of the column banks 122Y adjacent to the light-emitting elements 100.
    Type: Application
    Filed: October 5, 2020
    Publication date: April 8, 2021
    Applicant: JOLED INC.
    Inventor: Kenta Fukuoka
  • Publication number: 20210104581
    Abstract: A self-luminous display panel in which pixels composed of sub-pixels are arranged, including light-emitting elements and a light-shielding film. The light-emitting elements correspond one-to-one with the sub-pixels, each sub-pixel in a pixel emitting a different color of light. The light-shielding film is provided with openings at positions corresponding to the light-emitting elements in plan view, downstream in a light emission direction of the light-emitting elements. Optical distances between the light-shielding film and light emission reference points of the light-emitting elements are different, depending on light emission color of the light-emitting elements.
    Type: Application
    Filed: December 9, 2020
    Publication date: April 8, 2021
    Applicant: JOLED INC.
    Inventor: Kenta FUKUOKA
  • Publication number: 20210098745
    Abstract: A light-emitting element includes: a light-reflective first electrode; a light-emitting layer above the first electrode; a light-transmissive second electrode above the light-emitting layer; a first light-transmissive layer on the second electrode; and a second light-transmissive layer on the first layer. First optical cavity structure is formed between surface of the first electrode facing the light-emitting layer and surface of the second electrode facing the light-emitting layer. The first optical cavity structure corresponds to, as peak wavelength, first wavelength longer than peak wavelength of light emitted from the light-emitting layer. Second optical cavity structure is formed between the surface of the first electrode facing the light-emitting layer and an interface between the first layer and the second layer. The second optical cavity structure corresponds to, as peak wavelength, second wavelength shorter than the first wavelength.
    Type: Application
    Filed: September 29, 2020
    Publication date: April 1, 2021
    Applicant: JOLED Inc.
    Inventor: Shina KIRITA
  • Publication number: 20210098732
    Abstract: A display panel including a substrate, anodes disposed on or above the substrate, light-emitting layers disposed on or above the anodes, a first intermediate layer disposed on or above the light-emitting layers, a second intermediate layer disposed on the first intermediate layer, and a cathode disposed on or above the second intermediate layer. The first intermediate layer includes a fluoride of a first metal or a complex of the first metal. The second intermediate layer includes a second metal. The anodes are light-transmissive and the cathode is light-reflective, or the anodes are light-reflective and the cathode is light-transmissive. The first metal is selected from a group consisting of alkali metals and alkaline earth metals. The second metal is selected from rare earth metals.
    Type: Application
    Filed: September 22, 2020
    Publication date: April 1, 2021
    Applicant: JOLED Inc.
    Inventors: Hiroshi KATAGIRI, Takahiro KOMATSU
  • Patent number: 10964898
    Abstract: A display includes a display panel and a first protection sheet. The display panel has flexibility and a light output face. The first protection sheet is provided on the light output face and includes a first shock dispersion layer, a first strain relaxation layer, and a first shock absorption layer. The first shock dispersion layer includes a flexible reinforced-glass member, a flexible hard-coat film, or a flexible double-sided hard-coat film. The first strain relaxation layer includes a wet-laminated layer or a dry-laminated layer that is in close contact with a surface of the first shock dispersion layer adjacent to the display panel. The first shock absorption layer includes a gel layer having a thickness of submillimeter order or greater. The first shock absorption layer, the first strain relaxation layer, and the first shock dispersion layer are laminated in this order from the light output face of the display panel.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: March 30, 2021
    Assignee: JOLED INC.
    Inventors: Takahiro Seki, Katsumasa Yamazaki
  • Publication number: 20210090499
    Abstract: A current limiting circuit includes: a gain calculation circuit which calculates a screen power value based on pixel values and calculates a gain based on the screen power value; and a gain multiplication circuit which multiplies the pixel values by the gain, and when a maximum value of the pixel values exceeds a first threshold value, the gain calculation circuit calculates the screen power value by use of a common pixel value greater than or equal to the maximum value instead of the pixel values, and when the screen power value exceeds a control target power value, the gain calculation circuit sets the gain to a ratio of the control target power value with respect to the screen power value, and when the screen power value is less than or equal to the control target power value, the gain calculation circuit sets the gain to 1.
    Type: Application
    Filed: September 21, 2020
    Publication date: March 25, 2021
    Applicant: JOLED INC.
    Inventor: Toshiyuki KATO
  • Patent number: 10957722
    Abstract: A method of manufacturing a flexible device includes joining a first surface of a support substrate to a back surface of a flexible substrate, the first surface being opposite to a second surface of the support substrate; forming an element layer on a front surface of the flexible substrate; and performing multidirectional oblique irradiation of an interface and its vicinity between the support substrate and the flexible substrate with laser light from the second surface of the support substrate to detach the support substrate from the flexible substrate.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: March 23, 2021
    Assignee: JOLED INC.
    Inventors: Tomoatsu Kinoshita, Takashige Fujimori, Yuichi Kato
  • Patent number: 10957856
    Abstract: Disclosed is a method for manufacturing an organic EL display panel in which a plurality of organic electroluminescence elements each including an organic layer are arranged on an upper side of a substrate. The method includes applying an ink obtained by dissolving or dispersing an organic material in a solvent to a preset application area over the substrate, and cooling the ink applied in the applying within a period until the ink is dried, to lower an ink temperature to a second temperature lower than a first temperature of the ink at a time of application thereof.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: March 23, 2021
    Assignee: JOLED INC.
    Inventors: Yasuhiro Yamauchi, Shinichiro Ishino, Tomohiko Oda, Mineki Hasegawa, Yasuhiro Sekimoto
  • Publication number: 20210083194
    Abstract: A compound of formula (9) is provided. wherein, B1 and B2 are a methyl group, Z1 and Z2 are a hydrogen atom, X1 is an N-carbazolyl group, X2 is a —NAr21?Ar22? group, Ar21? is a 2-phenylphenyl group, a 3-phenylphenyl group, or a 4-phenylphenyl group, and Ar22? is a 1-naphthyl group, a 2-naphthyl group, a 2-phenylphenyl group, a 3-phenylphenyl group, a 4-phenylphenyl group, a 2-fluorenyl group, a 9,9-dimethyl-2-fluorenyl group or a phenanthryl group. Also provided is an organic electroluminescent device comprising a compound of formula (9).
    Type: Application
    Filed: November 30, 2020
    Publication date: March 18, 2021
    Applicants: Idemitsu Kosan Co., Ltd., JOLED Inc.
    Inventors: MASAHIRO KAWAMURA, Emiko KAMBE, Akifumi NAKAMURA, Yasunori KIJIMA, Tadahiko YOSHINAGA, Shigeyuki MATSUNAMI