Patents by Inventor Shuji Fukai

Shuji Fukai 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: 10679545
    Abstract: To provide a display device with high display quality, an eye-friendly display device, a display device with low power consumption, a display device with a reduced change in voltage written to a pixel, or a novel display device. In the display device, a first image signal in which one of grayscale levels of a first pixel and an adjacent second pixel is near white and the other is near black is written. The first image signal is compared with a second image signal. When the grayscale levels of the second image signal written to the first pixel and the second pixel are halftone, the second image signal is written an odd number of times greater than or equal to three times. When the grayscale levels of the second image signal written to the first pixel and the second pixel are near white or near black, the second image signal is written once.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: June 9, 2020
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Shuji Fukai
  • Publication number: 20190339577
    Abstract: The liquid crystal display device includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrat. The first substrate includes a transistor including an oxide semiconductor film including a channel formation region; a pixel electrode electrically connected to the transistor; an insulating layer in contact with the pixel electrode; and a first common electrode in contact with the insulating layer. The second substrate faces the first substrate and includes a second common electrode. A negative liquid crystal material is used for the liquid crystal layer. The specific resistivity of the liquid crystal material is greater than or equal to 1.0×1013 ?·cm and less than or equal to 1.0×1016 ?·cm.
    Type: Application
    Filed: July 18, 2019
    Publication date: November 7, 2019
    Inventors: Ryo HATSUMI, Shuji FUKAI, Daisuke KUBOTA
  • Patent number: 10416504
    Abstract: The liquid crystal display device includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate. The first substrate includes a transistor including an oxide semiconductor film including a channel formation region; a pixel electrode electrically connected to the transistor; an insulating layer in contact with the pixel electrode; and a first common electrode in contact with the insulating layer. The second substrate faces the first substrate and includes a second common electrode. A negative liquid crystal material is used for the liquid crystal layer. The specific resistivity of the liquid crystal material is greater than or equal to 1.0×1013 ?·cm and less than or equal to 1.0×1016 ?·cm.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: September 17, 2019
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Ryo Hatsumi, Shuji Fukai, Daisuke Kubota
  • Patent number: 10338419
    Abstract: A flicker of an FFS liquid crystal display device that is driven at a low refresh rate is reduced. In an FFS liquid crystal display, a pixel electrode and a first common electrode included in a liquid crystal element are formed on an element substrate side, and a second common electrode is formed on another substrate (counter substrate) side. By making the first and second common electrodes have the same potential, generation of a residual DC voltage can be suppressed in a pixel. Thus, even when a refresh rate is lowered, change in transmittance of a pixel can be suppressed in a data retention period, so that a flicker can be reduced.
    Type: Grant
    Filed: November 14, 2016
    Date of Patent: July 2, 2019
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shuji Fukai, Ryo Hatsumi, Daisuke Kubota
  • Publication number: 20180350316
    Abstract: To provide an information processing system allowing eye-friendly display. The information processing system includes a liquid crystal display device (LCD) as a display unit. An image can be displayed in the LCD by at least two driving methods: a first driving method in which data is sequentially rewritten every frame; and a second driving method in which rewriting of data is stopped after data is rewritten once or more times at the same refresh rate as the first driving method. After the display by the second driving method, each pixel is inversely driven plural times by a signal with an amplitude greater than or equal to 80% and less than or equal to 100% of the maximum amplitude of the data signal, whereby degradation of a liquid crystal material is repaired.
    Type: Application
    Filed: July 20, 2018
    Publication date: December 6, 2018
    Inventors: Ryo HATSUMI, Shuji FUKAI, Daisuke KUBOTA
  • Patent number: 9995970
    Abstract: The object can be achieved by the following structure. A material whose value of fracture toughness is greater than or equal to 1.5 [MPa·m1/2] is used for a base substrate and a counter substrate which hold a liquid crystal material therebetween; a first sealant containing liquid crystal contaminants at less than or equal to 1×10?4 wt % is provided so as be in contact with the liquid crystal material and to surround the liquid crystal material seamlessly; the second sealant is provided to surround the first sealant; and the base substrate and the counter substrate which hold the liquid crystal material therebetween using the first sealant and the second sealant are bonded with a bond strength of greater than or equal to 1 [N/mm2].
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: June 12, 2018
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yohei Monma, Hiroki Adachi, Shingo Eguchi, Saki Obana, Koji Moriya, Shuji Fukai
  • Publication number: 20180053459
    Abstract: To provide a display device with high display quality, an eye-friendly display device, a display device with low power consumption, a display device with a reduced change in voltage written to a pixel, or a novel display device. In the display device, a first image signal in which one of grayscale levels of a first pixel and an adjacent second pixel is near white and the other is near black is written. The first image signal is compared with a second image signal. When the grayscale levels of the second image signal written to the first pixel and the second pixel are halftone, the second image signal is written an odd number of times greater than or equal to three times. When the grayscale levels of the second image signal written to the first pixel and the second pixel are near white or near black, the second image signal is written once.
    Type: Application
    Filed: August 10, 2017
    Publication date: February 22, 2018
    Inventor: Shuji FUKAI
  • Publication number: 20170322437
    Abstract: The object can be achieved by the following structure. A material whose value of fracture toughness is greater than or equal to 1.5 [MPa·m1/2] is used for a base substrate and a counter substrate which hold a liquid crystal material therebetween; a first sealant containing liquid crystal contaminants at less than or equal to 1×10?4 wt % is provided so as be in contact with the liquid crystal material and to surround the liquid crystal material seamlessly; the second sealant is provided to surround the first sealant; and the base substrate and the counter substrate which hold the liquid crystal material therebetween using the first sealant and the second sealant are bonded with a bond strength of greater than or equal to 1 [N/mm2].
    Type: Application
    Filed: July 27, 2017
    Publication date: November 9, 2017
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yohei Monma, Hiroki Adachi, Shingo Eguchi, Saki Obana, Koji Moriya, Shuji Fukai
  • Publication number: 20170059910
    Abstract: A flicker of an FFS liquid crystal display device that is driven at a low refresh rate is reduced. In an FFS liquid crystal display, a pixel electrode and a first common electrode included in a liquid crystal element are formed on an element substrate side, and a second common electrode is formed on another substrate (counter substrate) side. By making the first and second common electrodes have the same potential, generation of a residual DC voltage can be suppressed in a pixel. Thus, even when a refresh rate is lowered, change in transmittance of a pixel can be suppressed in a data retention period, so that a flicker can be reduced.
    Type: Application
    Filed: November 14, 2016
    Publication date: March 2, 2017
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shuji FUKAI, Ryo HATSUMI, Daisuke KUBOTA
  • Patent number: 9500916
    Abstract: A flicker of an FFS liquid crystal display device that is driven at a low refresh rate is reduced. In an FFS liquid crystal display, a pixel electrode and a first common electrode included in a liquid crystal element are formed on an element substrate side, and a second common electrode is formed on another substrate (counter substrate) side. By making the first and second common electrodes have the same potential, generation of a residual DC voltage can be suppressed in a pixel. Thus, even when a refresh rate is lowered, change in transmittance of a pixel can be suppressed in a data retention period, so that a flicker can be reduced.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: November 22, 2016
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shuji Fukai, Ryo Hatsumi, Daisuke Kubota
  • Patent number: 9362522
    Abstract: An object is to improve productivity related to a laser light irradiation step in a bonding technique of substrates using glass frit. A highly airtight sealing structure or a highly airtight light-emitting device, which can be manufactured with high productivity, is provided. When a glass layer by melting glass frit or a sintered body by sintering glass frit is irradiated with laser light, in order to increase the efficiency, a light-absorbing material is attached to a surface of the glass layer. The laser light irradiation is performed on the light-absorbing material and the glass layer. The substrates are fixed with the glass layer therebetween.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: June 7, 2016
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shuji Fukai, Yusuke Kubota, Mika Jikumaru, Takeshi Nishi, Akihisa Shimomura, Yoji Nagano, Daiki Nakamura
  • Publication number: 20150029431
    Abstract: A flicker of an FFS liquid crystal display device that is driven at a low refresh rate is reduced. In an FFS liquid crystal display, a pixel electrode and a first common electrode included in a liquid crystal element are formed on an element substrate side, and a second common electrode is formed on another substrate (counter substrate) side. By making the first and second common electrodes have the same potential, generation of a residual DC voltage can be suppressed in a pixel. Thus, even when a refresh rate is lowered, change in transmittance of a pixel can be suppressed in a data retention period, so that a flicker can be reduced.
    Type: Application
    Filed: July 22, 2014
    Publication date: January 29, 2015
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shuji Fukai, Ryo Hatsumi, Daisuke Kubota
  • Publication number: 20140368488
    Abstract: To provide an information processing system allowing eye-friendly display. The information processing system includes a liquid crystal display device (LCD) as a display unit. An image can be displayed in the LCD by at least two driving methods: a first driving method in which data is sequentially rewritten every frame; and a second driving method in which rewriting of data is stopped after data is rewritten once or more times at the same refresh rate as the first driving method. After the display by the second driving method, each pixel is inversely driven plural times by a signal with an amplitude greater than or equal to 80% and less than or equal to 100% of the maximum amplitude of the data signal, whereby degradation of a liquid crystal material is repaired.
    Type: Application
    Filed: June 10, 2014
    Publication date: December 18, 2014
    Inventors: Ryo HATSUMI, Shuji Fukai, Daisuke Kubota
  • Publication number: 20140347588
    Abstract: The liquid crystal display device includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate. The first substrate includes a transistor including an oxide semiconductor film including a channel formation region; a pixel electrode electrically connected to the transistor; an insulating layer in contact with the pixel electrode; and a first common electrode in contact with the insulating layer. The second substrate faces the first substrate and includes a second common electrode. A negative liquid crystal material is used for the liquid crystal layer. The specific resistivity of the liquid crystal material is greater than or equal to 1.0×1013 ?·cm and less than or equal to 1.0×1016 ?·cm.
    Type: Application
    Filed: May 15, 2014
    Publication date: November 27, 2014
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Ryo HATSUMI, Shuji FUKAI, Daisuke KUBOTA
  • Patent number: 8854586
    Abstract: An object is to provide a liquid crystal display device using a liquid crystal material exhibiting a blue phase, in order to enable a higher contrast. In a liquid crystal display device which includes a liquid crystal layer exhibiting a blue phase, a first structure body and a second structure body are provided over a first electrode layer (a pixel electrode layer) and a second electrode layer (a common electrode layer), respectively. The first structure body and the second structure body are insulators each having a higher dielectric constant than a liquid crystal material used for the liquid crystal layer, and are provided to project into the liquid crystal layer.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: October 7, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Daisuke Kubota, Tetsuji Ishitani, Shuji Fukai
  • Publication number: 20140116614
    Abstract: An object is to improve productivity related to a laser light irradiation step in a bonding technique of substrates using glass frit. A highly airtight sealing structure or a highly airtight light-emitting device, which can be manufactured with high productivity, is provided. When a glass layer by melting glass frit or a sintered body by sintering glass frit is irradiated with laser light, in order to increase the efficiency, a light-absorbing material is attached to a surface of the glass layer. The laser light irradiation is performed on the light-absorbing material and the glass layer. The substrates are fixed with the glass layer therebetween.
    Type: Application
    Filed: October 22, 2013
    Publication date: May 1, 2014
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shuji Fukai, Yusuke Kubota, Mika Jikumaru, Takeshi Nishi, Akihisa Shimomura, Yoji Nagano, Daiki Nakamura
  • Patent number: 8547503
    Abstract: By providing a pixel electrode layer in a center of a liquid crystal layer sandwiched between a first common electrode layer and a second common electrode layer, a structure in which the following two optical elements are stacked can be obtained: a first liquid crystal element including the first common electrode layer, the liquid crystal layer, and the pixel electrode layer; and a second liquid crystal element including the pixel electrode layer, the liquid crystal layer, and the second common electrode layer.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: October 1, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Daisuke Kubota, Akio Yamashita, Shuji Fukai, Yoshiharu Hirakata
  • Patent number: 8368065
    Abstract: There have been problems in that a dedicated apparatus is needed for a conventional method of manufacturing an organic thin film transistor and in that: a little amount of an organic semiconductor film is formed with respect to a usage amount of a material; and most of the used material is discarded. Further, apparatus maintenance such as cleaning of the inside of an apparatus cup or chamber has needed to be frequently carried out in order to remove the contamination resulting from the material that is wastefully discarded. Therefore, a great cost for materials and man-hours for maintenance of apparatus have been required. In the present invention, a uniform organic semiconductor film is formed by forming an aperture between a first substrate for forming the organic semiconductor film and a second substrate used for injection with an insulating film formed at a specific spot and by injecting an organic semiconductor film material into the aperture due to capillarity to the aperture.
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: February 5, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yoshiharu Hirakata, Tetsuji Ishitani, Shuji Fukai, Ryota Imahayashi
  • Patent number: 8351012
    Abstract: To control the positioning of a spacer more accurately in a liquid crystal display device to prevent display defects due to incorrect positioning in a display region. To provide a liquid crystal display device with higher image quality and reliability, and to provide a method for manufacturing the liquid crystal display device with high yield. In a liquid crystal display device, a region onto which a spherical spacer is discharged is subjected to liquid-repellent treatment in order to reduce the wettability with respect to a liquid in which the spherical spacer is dispersed. The liquid (the droplet) does not spread over the liquid-repellent region and is dried while moving the spherical spacer toward the center of the liquid. Thus, incorrect positioning shortly after discharging, which has been caused by the loss of control in the liquid, can be corrected by moving the spherical spacer while drying the liquid.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: January 8, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Erika Takahashi, Gen Fujii, Shuji Fukai, Takeshi Nishi
  • Publication number: 20120200809
    Abstract: An object is to provide a liquid crystal display device using a liquid crystal material exhibiting a blue phase, in order to enable a higher contrast. In a liquid crystal display device which includes a liquid crystal layer exhibiting a blue phase, a first structure body and a second structure body are provided over a first electrode layer (a pixel electrode layer) and a second electrode layer (a common electrode layer), respectively. The first structure body and the second structure body are insulators each having a higher dielectric constant than a liquid crystal material used for the liquid crystal layer, and are provided to project into the liquid crystal layer.
    Type: Application
    Filed: April 16, 2012
    Publication date: August 9, 2012
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO.,
    Inventors: Daisuke KUBOTA, Tetsuji Ishitani, Shuji Fukai