Patents by Inventor Hidefumi Yoshida

Hidefumi Yoshida 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: 11409208
    Abstract: An exposure head for forming an image of a first resolution corresponding to an arrangement interval of a plurality of lower electrodes in a crossing direction or an image of a second resolution lower than the first resolution. A circuit portion includes an image data storage portion that is arranged on the substrate together with a plurality of lower electrodes and converts input image data into image data according to the resolution. By this, the same exposure head can be used for both high resolution images and low resolution images without degrading the image quality.
    Type: Grant
    Filed: August 21, 2020
    Date of Patent: August 9, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hidefumi Yoshida, Hayato Koyama
  • Publication number: 20220171226
    Abstract: Provided is a liquid crystal display device including: an active matrix substrate including a first substrate, and a first electrode and a second electrode that are stacked via a first insulating layer or that face each other on the first substrate, the second electrode being disposed for each sub-pixel; and a counter substrate sequentially including a second substrate, a third electrode including linear electrode portions, a second insulating layer, and a fourth electrode including linear electrode portions, an extending direction of the linear electrode portions of the third electrode intersecting an extending direction of the linear electrode portions of the fourth electrode in a plan view; and a control circuit being configured to switch between application of an alternating voltage and application of a constant voltage to the third electrode and/or the fourth electrode.
    Type: Application
    Filed: November 29, 2021
    Publication date: June 2, 2022
    Inventors: Koji MURATA, Hidefumi YOSHIDA
  • Publication number: 20220155622
    Abstract: Provided is a liquid crystal display device including: a liquid crystal panel; and a control circuit. The liquid crystal panel sequentially includes an active matrix substrate, a first alignment film, a liquid crystal layer containing liquid crystal molecules having a negative anisotropy of dielectric constant, a second alignment film aligning the liquid crystal molecules at an angle of 10° or greater and 30° or smaller, and a counter substrate. The active matrix substrate includes a first substrate, and a first electrode and a second electrode that are stacked via a first insulating layer or that face each other on the first substrate. The counter substrate sequentially includes a second substrate, a third electrode, a second insulating layer, and a fourth electrode. The control circuit is configured to switch between application of alternating voltage and application of constant voltage to the third and/or fourth electrode according to a display mode.
    Type: Application
    Filed: November 10, 2021
    Publication date: May 19, 2022
    Inventors: Koji MURATA, Hidefumi YOSHIDA
  • Publication number: 20220157271
    Abstract: Provided is a liquid crystal display device including: a liquid crystal panel including display units for displaying an image using a veil-view function; and a control circuit. The display units each include a pair of sub-pixels including a first sub-pixel and a second sub-pixel. The liquid crystal panel sequentially includes an active matrix substrate, a first alignment film, a liquid crystal layer containing liquid crystal molecules, a second alignment film, and a counter substrate. The active matrix substrate includes first and second electrodes that are stacked via a first insulating layer or that face each other on the first substrate. At least one of the first or second electrode is disposed for each first sub-pixel and for each second sub-pixel. The counter substrate includes a third electrode. The control circuit is configured to switch between application of alternating voltage and application of constant voltage to the third electrode.
    Type: Application
    Filed: November 18, 2021
    Publication date: May 19, 2022
    Inventors: Koji MURATA, Hidefumi YOSHIDA
  • Publication number: 20220146959
    Abstract: A light emitting device 401 includes a silicon substrate and a light emitting region including a lower electrode, a light emitting layer, and an upper electrode, and an exposure head is provided with a printed board on which light emitting devices 401 are arranged in a staggered form and a circuit portion 602 for controlling, on the basis of image data, a voltage of each of electrodes included in the lower electrode so that the light emitting device layer emits light and is for forming an image with a resolution corresponding to an arrangement interval of the lower electrode with respect to a crossing direction, and the circuit portion 602 is disposed together with the light emitting region on the silicon substrate. Costs on wire bonding and an area of a wiring board can be suppressed.
    Type: Application
    Filed: January 26, 2022
    Publication date: May 12, 2022
    Inventors: Yasutomo Furuta, Takahisa Ono, Hayato Koyama, Hidefumi Yoshida
  • Publication number: 20220066351
    Abstract: Disclosed is an image forming apparatus including a photosensitive drum which is rotatable; light-emitting portions arranged along a direction of a rotational axis of the photosensitive drum, the light-emitting portions emitting light based on image data in order to expose the photosensitive drum; a reference clock signal generation portion which generates a reference clock signal with a predetermined period; a modulated clock signal generation portion which generates a modulated clock signal with a predetermined modulation period by spreading a spectrum of the reference clock signal and by modulating the predetermined period, wherein the light-emitting portions emit light for a lighting time set based on the modulated clock signal; and a control signal generation portion which generates with a period of n times the predetermined modulation period (n is an integer greater than or equal to 1) a control signal for controlling a timing at which the light-emitting portions emit light.
    Type: Application
    Filed: August 11, 2021
    Publication date: March 3, 2022
    Inventor: Hidefumi Yoshida
  • Patent number: 11106153
    Abstract: An image forming apparatus includes an exposure portion including a plurality of surface emitting elements configured to expose a photosensitive member, a drive unit configured to turn ON the surface emitting elements based on image information, and a light amount control unit configured to adjust a drive current value to control an amount of light to be emitted from the surface emitting elements; and a controller configured to output the image information to the exposure portion. The controller includes a light amount adjustment unit configured to correct the image information based on an adjustment value to adjust the amount of light to be emitted from the surface emitting elements and a medium tone processing unit configured to quantize the image information corrected by the light amount adjustment unit by error diffusion to reduce a number of tones in the image information.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: August 31, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hidefumi Yoshida
  • Patent number: 10998529
    Abstract: A display device, to provide compensation for change in color level due to different viewing directions of a display surface and compensation for other optical characteristics of the display surface in a compatible manner, includes a light-emitting element layer including a light-emitting layer including a light-emitting element, a first electrode disposed below the light-emitting layer, and a second electrode disposed above the light-emitting layer, wherein an optical compensation layer is disposed above the light-emitting element layer, the optical compensation layer being configured to compensate for prevention of external light reflection on a display surface and compensate for change in color level of the display surface due to different viewing directions of the display surface.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: May 4, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Hidefumi Yoshida, Kiyoshi Minoura, Tokiyoshi Umeda, Kaoru Abe, Akira Sakai
  • Publication number: 20210124223
    Abstract: A liquid crystal display device includes: a liquid crystal panel including an active matrix substrate, a liquid crystal layer, and a color filter substrate in a stated order, the active matrix substrate including a first substrate, and a first electrode and second electrodes stacked with an insulating layer in between, the second electrodes arranged in the respective sub-pixels, the color filter substrate including a second substrate, a color filter, and a third electrode, either the first electrode or the second electrodes arranged with electrical connection over the sub-pixels, each of the sub-pixels provided with an optical opening, the third electrode not superimposed with at least a portion of each of the optical openings in a plan view and arranged with electrical connection, a control circuit configured to switch between application of alternating voltage and application of constant voltage to the third electrode.
    Type: Application
    Filed: October 22, 2020
    Publication date: April 29, 2021
    Inventors: KOJI MURATA, HIDEFUMI YOSHIDA
  • Publication number: 20210103307
    Abstract: A technique is provided that reduces dullness of a potential provided to a line such as gate line on an active-matrix substrate to enable driving the line at high speed and, at the same time, reduces the size of the picture frame region. On an active-matrix substrate (20a) are provided gate lines (13G) and source lines. On the active-matrix substrate (20a) are further provided: gate drivers (11) each including a plurality of switching elements, at least one of which is located in a pixel region, for supplying a scan signal to a gate line (13G); and lines (15L1) each for supplying a control signal to the associated gate driver (11). A control signal is supplied by a display control circuit (4) located outside the display region to the gate drivers (11) via the lines (15L1). In response to a control signal supplied, each gate driver (11) drives the gate line (13G) to which it is connected.
    Type: Application
    Filed: December 17, 2020
    Publication date: April 8, 2021
    Inventors: Kohei TANAKA, Hidefumi YOSHIDA, Takeshi NOMA, Ryo YONEBAYASHI, Takayuki NISHIYAMA, Mitsuhiro MURATA, Yosuke IWATA
  • Patent number: 10942411
    Abstract: A liquid crystal display device of the present invention includes: a first substrate including a pair of counter electrodes; a second substrate including a pixel electrode and a common electrode; and a liquid crystal layer that includes liquid crystal molecules aligned horizontally with the substrates. The liquid crystal display device is configured to perform display in any of multiple display modes. The multiple display modes include: a first display mode of performing display in a first state where an alternating-current voltage is applied at a first frequency between the pair of counter electrodes; and a second display mode of performing display in at least one of a second state where no voltage is applied between the pair of counter electrodes, or a third state where an alternating-current voltage is applied at a second frequency that is higher than the first frequency between the pair of counter electrodes.
    Type: Grant
    Filed: February 10, 2020
    Date of Patent: March 9, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Koji Murata, Hidefumi Yoshida
  • Publication number: 20210055669
    Abstract: An exposure head for forming an image of a first resolution corresponding to an arrangement interval of a plurality of lower electrodes in a crossing direction or an image of a second resolution lower than the first resolution. A circuit portion 602 includes an image data storage portion 804 which is arranged on the substrate together with a plurality of lower electrodes and converts input image data into image data according to the resolution. By this, the same exposure head can be used for both high resolution images and low resolution images without degrading the image quality.
    Type: Application
    Filed: August 21, 2020
    Publication date: February 25, 2021
    Inventors: Hidefumi Yoshida, Hayato Koyama
  • Patent number: 10930226
    Abstract: A liquid crystal display device is manufactured at a low cost. In the liquid crystal display device, three sub-pixel electrodes are connected by inter-electrode connection portions to form one pixel electrode. One TFT is connected to the pixel electrode. A screen of a liquid crystal display panel is divided into n (n?2) of areas. Gate signal lines G of each divided area are scanned simultaneously one line at a time in each divided area. A backlight device emits light after completion of the scanning of each divided area.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: February 23, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Hidefumi Yoshida, Kazutaka Hanaoka, Takahiro Sasaki, Kimiaki Nakamura
  • Patent number: 10921727
    Abstract: An exposure head configured to expose a photosensitive drum to light includes a circuit board on which a plating layer is formed, a semiconductor chip, which is provided on the plating layer, and includes a light emitting element configured to emit the light for exposing the photosensitive drum, a lens array configured to condense the light emitted from the light emitting element onto the photosensitive drum, and a housing to which the lens array and the circuit board are fixed, wherein the plating layer and a part of the housing abut against each other in an optical axis direction of the lens array, and wherein the light emitting element and the lens array are opposed to each other in the optical axis direction.
    Type: Grant
    Filed: May 31, 2019
    Date of Patent: February 16, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Hidefumi Yoshida
  • Patent number: 10901442
    Abstract: A technique is provided that reduces dullness of a potential provided to a line such as gate line on an active-matrix substrate to enable driving the line at high speed and, at the same time, reduces the size of the picture frame region. On an active-matrix substrate (20a) are provided gate lines (13G) and source lines. On the active-matrix substrate (20a) are further provided: gate drivers (11) each including a plurality of switching elements, at least one of which is located in a pixel region, for supplying a scan signal to a gate line (13G); and lines (15L1) each for supplying a control signal to the associated gate driver (11). A control signal is supplied by a display control circuit (4) located outside the display region to the gate drivers (11) via the lines (15L1). In response to a control signal supplied, each gate driver (11) drives the gate line (13G) to which it is connected.
    Type: Grant
    Filed: June 18, 2019
    Date of Patent: January 26, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Kohei Tanaka, Hidefumi Yoshida, Takeshi Noma, Ryo Yonebayashi, Takayuki Nishiyama, Mitsuhiro Murata, Yosuke Iwata
  • Publication number: 20200381669
    Abstract: A display device, to provide compensation for change in color level due to different viewing directions of a display surface and compensation for other optical characteristics of the display surface in a compatible manner, includes a light-emitting element layer including a light-emitting layer including a light-emitting element, a first electrode disposed below the light-emitting layer, and a second electrode disposed above the light-emitting layer, wherein an optical compensation layer is disposed above the light-emitting element layer, the optical compensation layer being configured to compensate for prevention of external light reflection on a display surface and compensate for change in color level of the display surface due to different viewing directions of the display surface.
    Type: Application
    Filed: November 30, 2017
    Publication date: December 3, 2020
    Inventors: HIDEFUMI YOSHIDA, KIYOSHI MINOURA, TOKIYOSHI UMEDA, KAORU ABE, AKIRA SAKAI
  • Publication number: 20200257143
    Abstract: A liquid crystal display device of the present invention includes: a first substrate including a pair of counter electrodes; a second substrate including a pixel electrode and a common electrode; and a liquid crystal layer that includes liquid crystal molecules aligned horizontally with the substrates. The liquid crystal display device is configured to perform display in any of multiple display modes. The multiple display modes include: a first display mode of performing display in a first state where an alternating-current voltage is applied at a first frequency between the pair of counter electrodes; and a second display mode of performing display in at least one of a second state where no voltage is applied between the pair of counter electrodes, or a third state where an alternating-current voltage is applied at a second frequency that is higher than the first frequency between the pair of counter electrodes.
    Type: Application
    Filed: February 10, 2020
    Publication date: August 13, 2020
    Inventors: KOJI MURATA, HIDEFUMI YOSHIDA
  • Patent number: 10741135
    Abstract: A liquid crystal display device includes sub-pixel electrodes respectively provided to three sub-pixels, and an interelectrode connection portion that connects sub-pixel electrodes adjacent to each other among the sub-pixel electrodes. The interelectrode connection portion is provided in a position where boundaries of liquid crystal alignment directions of sub-pixels adjacent to each other are connected.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: August 11, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Takahiro Sasaki, Hidefumi Yoshida, Kazutaka Hanaoka, Kimiaki Nakamura
  • Publication number: 20200201091
    Abstract: A liquid crystal display panel including a first substrate, a liquid crystal layer, and a second substrate, the first substrate including in the following order to a liquid crystal layer side: a first electrode, an insulating layer, and a second electrode provided with an aperture, the liquid crystal layer containing liquid crystal molecules homogeneously aligned in a no-voltage-applied state, the aperture having an outline including a first outline portion and a second outline portion which are at different directions to each other in each of pixels, the liquid crystal display panel further including a rib protruding to the liquid crystal layer side and disposed between the first outline portion and the second outline portion on one or both of a liquid crystal layer-side surface of the first substrate and a liquid crystal layer-side surface of the second substrate.
    Type: Application
    Filed: May 14, 2018
    Publication date: June 25, 2020
    Inventors: KIMIAKI NAKAMURA, TAKASHI KATAYAMA, TAKAHIRO SASAKI, SHINPEI HIGASHIDA, KAZUTAKA HANAOKA, HIDEFUMI YOSHIDA
  • Publication number: 20200160799
    Abstract: A liquid crystal display device is manufactured at a low cost. In the liquid crystal display device, three sub-pixel electrodes are connected by inter-electrode connection portions to form one pixel electrode. One TFT is connected to the pixel electrode. A screen of a liquid crystal display panel is divided into n (n?2) of areas. Gate signal lines G of each divided area are scanned simultaneously one line at a time in each divided area. A backlight device emits light after completion of the scanning of each divided area.
    Type: Application
    Filed: April 17, 2018
    Publication date: May 21, 2020
    Inventors: HIDEFUMI YOSHIDA, KAZUTAKA HANAOKA, TAKAHIRO SASAKI, KIMIAKI NAKAMURA