Patents by Inventor Kazuhiko Sako

Kazuhiko Sako 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: 11948522
    Abstract: According to an aspect, a display device includes: an image display panel having an image display surface on which display is to be controlled based on an image signal; a light source device that includes light sources provided corresponding to divided partial areas of the image display surface, and is configured to illuminate the image display surface; and a signal processor configured to calculate a light quantity of each light source for each of the partial areas. The signal processor is configured to calculate the light quantity for each partial area based on the image signal, set one of the partial areas as an adjustment target partial area for the light quantity, and adjust the light quantity in the adjustment target partial area when the light quantity of an adjacent partial area located around the adjustment target partial area is equal to or smaller than a predetermined value.
    Type: Grant
    Filed: September 16, 2021
    Date of Patent: April 2, 2024
    Assignee: Japan Display Inc.
    Inventors: Kazuhiko Sako, Tsutomu Harada
  • Publication number: 20240101835
    Abstract: This flat conductive plate provided with an insulating film includes a flat conductive plate which is a punched product, and an insulating film which coats at least a part of the flat conductive plate, the insulating film is an electrodeposited film, the insulating film includes a polyamide-imide resin and a fluorine-based resin, an amount of the fluorine-based resin with respect to a total amount of the polyamide-imide resin and the fluorine-based resin is in a range of 72% by mass or more and 95% by mass or less, a relative permittivity at 25° C. is in a range of 2.2 or more and 2.8 or less, and an average film thickness is in a range of 5 ?m or more and 100 ?m or less.
    Type: Application
    Filed: March 10, 2022
    Publication date: March 28, 2024
    Applicant: MITSUBISHI MATERIALS CORPORATION
    Inventors: Kazuhiko Yamasaki, Nagisa Sako
  • Publication number: 20240078965
    Abstract: A display device includes a plurality of light-emitting elements, and a control circuit configured to control drive of the light-emitting elements. The control circuit divides one frame period into a plurality of subframe periods having different lengths and controls light emission and non-emission of the light-emitting elements for each of the subframe periods.
    Type: Application
    Filed: September 1, 2023
    Publication date: March 7, 2024
    Inventors: Kazunari TOMIZAWA, Kazuhiko SAKO, Tsutomu HARADA
  • Publication number: 20230298512
    Abstract: According to an aspect, a display device includes a pixel including a first sub-pixel configured to emit light having a peak in a spectrum of red, a second sub-pixel configured to emit light having a peak in a spectrum of green, and a third sub-pixel configured to emit light having a peak in a spectrum of blue. The first sub-pixel, the second sub-pixel, and the third sub-pixel are inorganic light-emitting diodes. A light emission intensity of the second sub-pixel is increased at a predetermined ratio with respect to a light emission intensity of the first sub-pixel when the first sub-pixel emits light at a light emission intensity within a low-luminance range equal to or lower than a predetermined level of luminance.
    Type: Application
    Filed: April 21, 2023
    Publication date: September 21, 2023
    Inventors: Kazuhiko SAKO, Kazunari TOMIZAWA, Tsutomu HARADA
  • Patent number: 11749214
    Abstract: A display device is provided and includes display panel comprising plurality of pixels; and light source device configured to emit light that illuminates display panel, wherein display panel is configured to control operation of light source device, display panel does not lower luminance of light for second predetermined time or longer after display panel has raised luminance of light by predetermined amount of luminance change or more within first predetermined time, and when image changes from first image other than raster image and ramp image to second image that is either of raster image and ramp image, display panel lowers luminance of light within time shorter than second predetermined time even after luminance of light has been raised by predetermined amount of luminance change or more within first predetermined time.
    Type: Grant
    Filed: March 22, 2021
    Date of Patent: September 5, 2023
    Assignee: Japan Display Inc.
    Inventors: Kazuhiko Sako, Tsutomu Harada, Naoyuki Takasaki, Toshiyuki Nagatsuma
  • Publication number: 20230274711
    Abstract: According to one embodiment, an electronic device includes a display panel configured to display an image and including a display region that transmits external light, a light source unit, a camera opposed to the display region of the display panel, and a control unit. The control unit is configured to in a light emission period, permit irradiation of light by the light source unit, irradiate the display region with light, display the image in the display region, and prohibit capturing by the camera. The control unit is configured to in a capturing period, prohibit the irradiation of the light by the light source unit, set the display region to be transparent, permit the capturing by the camera, and take in the external light transmitted through the display region to the camera.
    Type: Application
    Filed: February 23, 2023
    Publication date: August 31, 2023
    Applicant: Japan Display Inc.
    Inventors: Kentaro OKUYAMA, Kazuhiko SAKO, Tsutomu HARADA, Takayuki NAKANISHI, Kazunari TOMIZAWA
  • Patent number: 11663959
    Abstract: According to an aspect, a display device includes a pixel including a first sub-pixel configured to emit light having a peak in a spectrum of red, a second sub-pixel configured to emit light having a peak in a spectrum of green, and a third sub-pixel configured to emit light having a peak in a spectrum of blue. The first sub-pixel, the second sub-pixel, and the third sub-pixel are inorganic light-emitting diodes. A light emission intensity of the second sub-pixel is increased at a predetermined ratio with respect to a light emission intensity of the first sub-pixel when the first sub-pixel emits light at a light emission intensity within a low-luminance range equal to or lower than a predetermined level of luminance.
    Type: Grant
    Filed: April 22, 2022
    Date of Patent: May 30, 2023
    Assignee: Japan Display Inc.
    Inventors: Kazuhiko Sako, Kazunari Tomizawa, Tsutomu Harada
  • Patent number: 11620964
    Abstract: According to an aspect, a display device includes: a display panel that has a display area in which a plurality of pixels are arranged; a light source configured to illuminate the display area; a first control circuit configured to receive first signals corresponding to a first partial image to be displayed in a portion of the display area; and a second control circuit configured to receive second signals corresponding to a second partial image to be displayed in another portion of the display area. The light source has a plurality of light-emitting areas in each of which a light emission intensity is individually controllable. The first control circuit is configured to transmit lighting quantity information indicating the light emission intensity of each of the light-emitting areas to the second control circuit.
    Type: Grant
    Filed: June 9, 2021
    Date of Patent: April 4, 2023
    Assignee: Japan Display Inc.
    Inventors: Tomoyuki Ishihara, Kazuhiko Sako
  • Patent number: 11545101
    Abstract: According to an aspect, a display device includes: a first liquid crystal panel; a second liquid crystal panel; a light source configured to emit light; and a controller configured to control the first liquid crystal panel and the second liquid crystal panel based on an image signal corresponding to a resolution of the second liquid crystal panel. The first liquid crystal panel includes dimming pixels, and the second liquid crystal panel includes pixels. More than one of the pixels is arranged within a region of each of the dimming pixels. The controller performs blurring processing and determination of dimming gradation values as processing related to operation of the second liquid crystal panel. Each of the dimming gradation values corresponds to a highest gradation value set after the blurring processing among gradation values set for the more than one pixel arranged within the region of each of the dimming pixels.
    Type: Grant
    Filed: May 31, 2022
    Date of Patent: January 3, 2023
    Assignee: Japan Display Inc.
    Inventors: Kazunari Tomizawa, Kazuhiko Sako, Junji Kobashi, Tomoyuki Ishihara
  • Publication number: 20220392418
    Abstract: According to an aspect, a display device includes: a first liquid crystal panel; a second liquid crystal panel; a light source configured to emit light; and a controller configured to control the first liquid crystal panel and the second liquid crystal panel based on an image signal corresponding to a resolution of the second liquid crystal panel. The first liquid crystal panel includes dimming pixels, and the second liquid crystal panel includes pixels. More than one of the pixels is arranged within a region of each of the dimming pixels. The controller performs blurring processing and determination of dimming gradation values as processing related to operation of the second liquid crystal panel. Each of the dimming gradation values corresponds to a highest gradation value set after the blurring processing among gradation values set for the more than one pixel arranged within the region of each of the dimming pixels.
    Type: Application
    Filed: May 31, 2022
    Publication date: December 8, 2022
    Inventors: Kazunari Tomizawa, Kazuhiko Sako, Junji Kobashi, Tomoyuki Ishihara
  • Publication number: 20220351675
    Abstract: According to an aspect, a display device includes a pixel including a first sub-pixel configured to emit light having a peak in a spectrum of red, a second sub-pixel configured to emit light having a peak in a spectrum of green, and a third sub-pixel configured to emit light having a peak in a spectrum of blue. The first sub-pixel, the second sub-pixel, and the third sub-pixel are inorganic light-emitting diodes. A light emission intensity of the second sub-pixel is increased at a predetermined ratio with respect to a light emission intensity of the first sub-pixel when the first sub-pixel emits light at a light emission intensity within a low-luminance range equal to or lower than a predetermined level of luminance.
    Type: Application
    Filed: April 22, 2022
    Publication date: November 3, 2022
    Inventors: Kazuhiko SAKO, Kazunari TOMIZAWA, Tsutomu HARADA
  • Patent number: 11443708
    Abstract: A liquid crystal display device includes: a liquid crystal panel having pixels with a first electrode and a second electrode; a control circuit; and a counter. The number and an arrangement of pixels where a potential of the second electrode is higher than that of the first electrode in a first mode equal the number and an arrangement of pixels where the potential of the first electrode is higher than that of the second electrode in a second mode. The counter increases a count while the panel operates in the first mode, and decreases the count while the panel operates in the second mode. The control circuit operates the panel in the first mode when the count at a determination timing is not greater than a first threshold, and operates the panel in the second mode when the count at the determination timing is not less than a second threshold.
    Type: Grant
    Filed: June 9, 2021
    Date of Patent: September 13, 2022
    Assignee: Japan Display Inc.
    Inventors: Tomoyuki Ishihara, Kazuhiko Sako
  • Publication number: 20220005420
    Abstract: According to an aspect, a display device includes: an image display panel having an image display surface on which display is to be controlled based on an image signal; a light source device that includes light sources provided corresponding to divided partial areas of the image display surface, and is configured to illuminate the image display surface; and a signal processor configured to calculate a light quantity of each light source for each of the partial areas. The signal processor is configured to calculate the light quantity for each partial area based on the image signal, set one of the partial areas as an adjustment target partial area for the light quantity, and adjust the light quantity in the adjustment target partial area when the light quantity of an adjacent partial area located around the adjustment target partial area is equal to or smaller than a predetermined value.
    Type: Application
    Filed: September 16, 2021
    Publication date: January 6, 2022
    Inventors: Kazuhiko SAKO, Tsutomu HARADA
  • Publication number: 20210390925
    Abstract: According to an aspect, a display device includes: a display panel that has a display area in which a plurality of pixels are arranged; a light source configured to illuminate the display area; a first control circuit configured to receive first signals corresponding to a first partial image to be displayed in a portion of the display area; and a second control circuit configured to receive second signals corresponding to a second partial image to be displayed in another portion of the display area. The light source has a plurality of light-emitting areas in each of which a light emission intensity is individually controllable. The first control circuit is configured to transmit lighting quantity information indicating the light emission intensity of each of the light-emitting areas to the second control circuit.
    Type: Application
    Filed: June 9, 2021
    Publication date: December 16, 2021
    Inventors: Tomoyuki ISHIHARA, Kazuhiko SAKO
  • Publication number: 20210390919
    Abstract: A liquid crystal display device includes: a liquid crystal panel having pixels with a first electrode and a second electrode; a control circuit; and a counter. The number and an arrangement of pixels where a potential of the second electrode is higher than that of the first electrode in a first mode equal the number and an arrangement of pixels where the potential of the first electrode is higher than that of the second electrode in a second mode. The counter increases a count while the panel operates in the first mode, and decreases the count while the panel operates in the second mode. The control circuit operates the panel in the first mode when the count at a determination timing is not greater than a first threshold, and operates the panel in the second mode when the count at the determination timing is not less than a second threshold.
    Type: Application
    Filed: June 9, 2021
    Publication date: December 16, 2021
    Inventors: Tomoyuki ISHIHARA, Kazuhiko SAKO
  • Patent number: 11175500
    Abstract: According to one embodiment, when displaying an image on a display panel, projecting an image which is displayed on the display panel, inclining the image which is projected from the display panel at a predetermined angle of bend, and reflecting the image which is projected from the display panel via a prism and guiding the image to a projection surface, a display device corrects input picture image of the prism based on characteristics contrary to the chromatic aberration characteristics of the prism.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: November 16, 2021
    Assignee: Japan Display Inc.
    Inventors: Tsutomu Harada, Kazuhiko Sako
  • Publication number: 20210210028
    Abstract: A display device is provided and includes display panel comprising plurality of pixels; and light source device configured to emit light that illuminates display panel, wherein display panel is configured to control operation of light source device, display panel does not lower luminance of light for second predetermined time or longer after display panel has raised luminance of light by predetermined amount of luminance change or more within first predetermined time, and when image changes from first image other than raster image and ramp image to second image that is either of raster image and ramp image, display panel lowers luminance of light within time shorter than second predetermined time even after luminance of light has been raised by predetermined amount of luminance change or more within first predetermined time.
    Type: Application
    Filed: March 22, 2021
    Publication date: July 8, 2021
    Inventors: Kazuhiko SAKO, Tsutomu HARADA, Naoyuki TAKASAKI, Toshiyuki NAGATSUMA
  • Patent number: 10957261
    Abstract: According to an aspect, a display device includes a display unit including a plurality of pixels, a light source device that emits light that illuminates the display unit, and a controller that controls operation of the light source device. The controller does not lower luminance of the light for a second predetermined time or longer after the controller has raised the luminance of the light by a predetermined amount of luminance change or more within a first predetermined time.
    Type: Grant
    Filed: January 15, 2019
    Date of Patent: March 23, 2021
    Assignee: Japan Display Inc.
    Inventors: Kazuhiko Sako, Tsutomu Harada, Naoyuki Takasaki, Toshiyuki Nagatsuma
  • Patent number: 10803829
    Abstract: A display device includes: a first controller that outputs an output image signal having the same resolution as that of pixels to an image display panel; and a second controller that transmits an input image signal to the first controller, generates second luminance distribution data divided into regions at a second density lower than a first density equal to the resolution, and transmits the second luminance distribution data to the first controller. The second controller generates first luminance distribution data divided into regions at a third density lower than the second density, controls an illuminator based on the first luminance distribution data, and generates the second luminance distribution data by applying a polynomial interpolation to the first luminance distribution data. The first controller generates third luminance distribution data having the resolution, and generates the output image signal by adjusting the input image signal based on the third luminance distribution data.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: October 13, 2020
    Assignee: Japan Display Inc.
    Inventors: Tsutomu Harada, Kazuhiko Sako
  • Patent number: 10770008
    Abstract: According to an aspect, a display device includes a display panel comprising a plurality of pixels, a light guide plate, a light source configured to emit light from a lateral side of the light guide plate, a dimming panel, and a controller. The dimming panel comprises a plurality of dimming areas arranged in an emission direction of the light from the light source. The dimming areas are capable of individually changing transmittance of the light according to intensities of light required to display an image using the display panel. When adjacent two of the dimming areas differ in light transmittance from each other, the controller increases output gradation values of target pixels, the target pixels being located in a predetermined area extending from a boundary between the two dimming areas in one of the two dimming areas that has lower light transmittance.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: September 8, 2020
    Assignee: Japan Display Inc.
    Inventors: Kazuhiko Sako, Daichi Suzuki, Naoyuki Takasaki, Tsutomu Harada, Kojiro Ikeda