Patents by Inventor Naoki Tomikawa

Naoki Tomikawa 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).

  • Publication number: 20160284302
    Abstract: Provided are a driving method of an electro-optical device, an electro-optical device and an electronic apparatus in which reductions in display quality are suppressed. The driving method of an electro-optical device that is provided with an element substrate, a facing substrate, and a liquid crystal layer that is disposed between the element substrate and the facing substrate, includes applying an AC signal V1 to a plurality of first pixel electrode that are electrically connected to a first scanning line of the element substrate 10, and applying an AC signal V2 to a plurality of second pixel electrodes that are electrically connected to a second scanning line, which is disposed adjacent to the first scanning line, and the phase of the AC signal V2 is delayed by a predetermined amount with respect to that of the AC signal V1.
    Type: Application
    Filed: October 30, 2014
    Publication date: September 29, 2016
    Inventors: Naoki TOMIKAWA, Nariya TAKAHASHI
  • Publication number: 20160253973
    Abstract: A liquid crystal device includes a first electrode that is supplied with a first potential, a second electrode that is provided between the first electrode and a sealing member and is supplied with a second potential, and a third electrode that is provided between the second electrode and the sealing member and is supplied with a third potential. A width of the third electrode is greater than widths of the first electrode and the second electrode in a direction from an outer edge of a display region toward the sealing member.
    Type: Application
    Filed: January 31, 2016
    Publication date: September 1, 2016
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Masakazu NISHIDA, Naoki TOMIKAWA
  • Patent number: 9412319
    Abstract: A driving method for a liquid crystal device, which has a first electrode, a second electrode, and a third electrode for trapping ions, includes applying AC signals having the same frequency but whose phases in an amount of time corresponding to a single cycle are shifted relative to each other to the first electrode, the second electrode, and the third electrode, respectively, so that the distribution of an electrical field produced between the first electrode, the second electrode, and the third electrode is scrolled from the first electrode to the third electrode over time.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: August 9, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Naoki Tomikawa
  • Publication number: 20160209685
    Abstract: A liquid crystal device includes a pixel electrode, a peripheral electrode that is arranged between an outer edge of a display region in which the pixel electrode is arranged and a sealing material, a control electrode that is arranged between the outer edge of the display region and the peripheral electrode, a common electrode that is provided on a facing substrate, and an orientation film that substantially vertically orients liquid crystal molecules in a liquid crystal layer on the control electrode. In a display period during which the pixel electrode is driven, a potential that is lower than a potential of the common electrode is supplied to the peripheral electrode, and an AC potential with reference to the potential of the common electrode is supplied to the control electrode. In a non-display period during which the pixel electrode is not driven, no potential is supplied to the control electrode.
    Type: Application
    Filed: January 7, 2016
    Publication date: July 21, 2016
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Naoki TOMIKAWA, Tomoki YOKOTA
  • Publication number: 20150198827
    Abstract: There is provided a liquid crystal device including an element substrate, a counter substrate which is arranged to face the element substrate, a liquid crystal layer which is arranged between the element substrate and the counter substrate, and inorganic alignment films which are arranged between the element substrate and the liquid crystal layer and between the counter substrate and the liquid crystal layer. A silane compound film with which a fullerene is modified is arranged to cover the inorganic alignment film.
    Type: Application
    Filed: January 9, 2015
    Publication date: July 16, 2015
    Inventor: Naoki Tomikawa
  • Publication number: 20150201172
    Abstract: In a projection type display apparatus, a lighting device includes two reflection type cutoff filters (first cutoff filter and reflective second cutoff filter) which block out ultraviolet range light on an output optical path from a light source. A cut on wavelength of the second cutoff filter on the front side is longer than that of the first cutoff filter on the rear side. The two cutoff filters are formed on planar-shaped first faces of a first integrator lens and a second integrator lens. For this reason, both input faces of the two cutoff filters are orthogonal to an apparatus optical axis.
    Type: Application
    Filed: January 9, 2015
    Publication date: July 16, 2015
    Inventors: Naoki Tomikawa, Takenori Hirota, Ryuichi Kurosawa
  • Publication number: 20140368481
    Abstract: A driving method for a liquid crystal device, which has a first electrode, a second electrode, and a third electrode for trapping ions, includes applying AC signals having the same frequency but whose phases in an amount of time corresponding to a single cycle are shifted relative to each other to the first electrode, the second electrode, and the third electrode, respectively, so that the distribution of an electrical field produced between the first electrode, the second electrode, and the third electrode is scrolled from the first electrode to the third electrode over time.
    Type: Application
    Filed: June 16, 2014
    Publication date: December 18, 2014
    Inventor: Naoki Tomikawa
  • Patent number: 8873126
    Abstract: An electrooptic device includes first and second substrates that are disposed opposing each other with an electrooptic material layer therebetween, a sealing material that bonds the first and second substrates, a pixel area, and an ion trap portion between the pixel area and the sealing material. The ion trap portion includes first and second electrodes that are formed in a comb-tooth shape and are disposed so that branch electrodes of the first electrode and branch electrodes of the second electrode are engaged with each other. A direction of the branch electrodes intersects with an orientation direction of the electrooptic material at an interface between the electrooptic material layer and the first substrate.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: October 28, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Naoki Tomikawa, Hiroyuki Hara, Tomoki Yokota
  • Patent number: 8865491
    Abstract: Disclosed is a method for producing an electro-optical device, which includes a step of defining sealing materials on either an element substrate side of a mother substrate or an opposing substrate side of the mother substrate, a step of supplying liquid crystal inside the sealing materials, a step of bonding the element substrate side of the mother substrate and the opposing substrate side of the mother substrate together, and a step of hardening the sealing materials in order to apply a predetermined potential to a peripheral electrode provided between a pixel region and sealing materials in at least a portion of the steps.
    Type: Grant
    Filed: May 3, 2013
    Date of Patent: October 21, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Naoki Tomikawa
  • Publication number: 20140307190
    Abstract: In a liquid crystal device, pixel electrodes and a common electrode that opposes the pixel electrodes on another side of a liquid crystal layer are formed in a display region serving as a first region, and dummy pixel electrodes serving as first electrodes are formed in a dummy pixel region serving as a second region. A driving method for the liquid crystal device applies a voltage that is lower than a threshold voltage at which the transmissibility of liquid crystals changes between the dummy pixel electrodes and the common electrode. Accordingly, the dummy pixel electrodes can function as an electricity parting portion and ionic impurities can be pulled from the display region to the dummy pixel electrodes.
    Type: Application
    Filed: April 10, 2014
    Publication date: October 16, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Naoki Tomikawa
  • Publication number: 20130300961
    Abstract: Provided is a liquid crystal panel including a liquid crystal layer interposed between a first substrate and a second substrate, and a peripheral electrode arranged so as to surround a pixel region; a lamp irradiating a liquid crystal layer with light; and a fan increasing the temperature of the liquid crystal panel during an off sequence higher than the temperature of the liquid crystal panel before a falling period.
    Type: Application
    Filed: May 8, 2013
    Publication date: November 14, 2013
    Applicant: Seiko Epson Corporation
    Inventor: Naoki TOMIKAWA
  • Publication number: 20130302921
    Abstract: Disclosed is a method for producing an electro-optical device, which includes a step of defining sealing materials on either an element substrate side of a mother substrate or an opposing substrate side of the mother substrate, a step of supplying liquid crystal inside the sealing materials, a step of bonding the element substrate side of the mother substrate and the opposing substrate side of the mother substrate together, and a step of hardening the sealing materials in order to apply a predetermined potential to a peripheral electrode provided between a pixel region and sealing materials in at least a portion of the steps.
    Type: Application
    Filed: May 3, 2013
    Publication date: November 14, 2013
    Applicant: Seiko Epson Corporation
    Inventor: Naoki Tomikawa
  • Publication number: 20130021657
    Abstract: An electrooptic device includes first and second substrates that are disposed opposing each other with an electrooptic material layer therebetween, a sealing material that bonds the first and second substrates, a pixel area, and an ion trap portion between the pixel area and the sealing material. The ion trap portion includes first and second electrodes that are formed in a comb-tooth shape and are disposed so that branch electrodes of the first electrode and branch electrodes of the second electrode are engaged with each other. A direction of the branch electrodes intersects with an orientation direction of the electrooptic material at an interface between the electrooptic material layer and the first substrate.
    Type: Application
    Filed: July 17, 2012
    Publication date: January 24, 2013
    Applicant: Seiko Epson Corporation
    Inventors: Naoki Tomikawa, Hiroyuki Hara, Tomoki Yokota
  • Patent number: 8081274
    Abstract: A liquid crystal device includes a first substrate and a second substrate that are disposed to face each other, a first electrode and a second electrode that are disposed on a surface, which faces the second substrate, of the first substrate, a liquid crystal layer that is disposed between the first substrate and the second substrate and has liquid crystal molecules aligned in a direction parallel to the first substrate, and a pair of polarizing elements having the liquid crystal layer interposed therebetween. The liquid crystal molecules are driven by an electric field that is generated by an electric potential difference between the first electrode and the second electrode and has a component parallel to the first substrate, and the retardation of the liquid crystal layer is equal to or larger than 0.66 ? and is equal to or smaller than 0.83 ? for light having a wavelength ? of 555 nm.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: December 20, 2011
    Assignee: Sony Corporation
    Inventor: Naoki Tomikawa
  • Publication number: 20090009704
    Abstract: A liquid crystal device includes a first substrate and a second substrate that are disposed to face each other, a first electrode and a second electrode that are disposed on a surface, which faces the second substrate, of the first substrate, a liquid crystal layer that is disposed between the first substrate and the second substrate and has liquid crystal molecules aligned in a direction parallel to the first substrate, and a pair of polarizing elements having the liquid crystal layer interposed therebetween. The liquid crystal molecules are driven by an electric field that is generated by an electric potential difference between the first electrode and the second electrode and has a component parallel to the first substrate, and the retardation of the liquid crystal layer is equal to or larger than 0.66? and is equal to or smaller than 0.83? for light having a wavelength ? of 555 nm.
    Type: Application
    Filed: May 16, 2008
    Publication date: January 8, 2009
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Naoki TOMIKAWA