Patents by Inventor Masakatsu Higa

Masakatsu Higa 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: 20080074597
    Abstract: A liquid crystal device includes a first substrate and a second substrate facing each other and sandwiching a liquid crystal layer therebetween, a first electrode disposed on the first substrate at a side thereof proximate to the liquid crystal layer, a second electrode disposed above the first electrode with an insulating film therebetween, and an orientation film covering the insulating film and the second electrode. The second electrode includes a plurality of strip electrode segments each extending along the first and second substrates and having a connected end at one end of the strip electrode segment and an open end at the other end of the strip electrode segment, a connecting segment connecting the connected ends of the plurality of strip electrode segments together. The orientation film is given a rubbing treatment in a direction from the connected ends towards the open ends of the strip electrode segments.
    Type: Application
    Filed: August 6, 2007
    Publication date: March 27, 2008
    Applicant: EPSON IMAGING DEVICES CORPORATION
    Inventors: Masakatsu Higa, Hiroshi Wada
  • Patent number: 7259816
    Abstract: Aspects of the invention can provide a transflective liquid crystal display device of vertical alignment mode capable of suitably controlling the direction that liquid crystal molecules are tilted. The liquid crystal display device can include a liquid crystal layer interposed between a pair of substrate and transmissive and reflective display regions in each dot region. An insulating film for varying the thickness of the liquid crystal layer in the reflective and transmissive display regions is provided. On a substrate having the insulating film formed thereon, an electrode slit for controlling the alignment of the liquid crystal molecules can be formed in the reflective display region. Similarly, a convex portion for controlling the alignment of the liquid crystal molecules can be formed in the transmissive display region.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: August 21, 2007
    Assignee: Seiko Epson Corporation
    Inventor: Masakatsu Higa
  • Publication number: 20070182892
    Abstract: A liquid crystal display device whose sub-pixel region has a reflective display region that displays an image in a reflective mode and a transmissive display region that displays an image in a transmissive mode includes a first substrate, a second substrate opposing the first substrate; and a liquid crystal layer between the first substrate and the second substrate. The liquid crystal layer has a smaller thickness in the reflective display region than in the transmissive display region. One of the first substrate and the second substrate includes a reflection layer in the reflective display region, and the other substrate includes on the liquid crystal layer side a functional resin layer having a first functional resin sub layer in the reflective display region and a second functional resin sub layer in the transmissive display region. The first functional resin sub layer and the second functional resin sub layer serve as retardation layers with different optical axes from each other.
    Type: Application
    Filed: January 24, 2007
    Publication date: August 9, 2007
    Applicant: SANYO EPSON IMAGING DEVICES CORPORATION
    Inventors: Masakatsu Higa, Hitoshi Tsuchiya
  • Publication number: 20070177080
    Abstract: A liquid crystal display device includes a first substrate and a second substrate, a liquid crystal layer between the first and second substrates, and an alignment layer between the liquid crystal layer and at least one of the substrates. The liquid crystal layer contains liquid crystal molecules having a negative anisotropy of dielectric constant. The alignment layer aligns the liquid crystal molecules perpendicular to the substrate. The liquid crystal display device further includes pixels. Each pixel includes a plurality of subpixels expressing different colors. Each subpixel includes a stepped layer therein such that the stepped layer is disposed between the liquid crystal layer and at least one of the substrates. The stepped layer defines a first region and a second region in the subpixel. The thickness of the liquid crystal layer is relatively thick in the first region and relatively thin in the second region. The area ratio of the first region depends on a color expressed by the subpixel.
    Type: Application
    Filed: January 9, 2007
    Publication date: August 2, 2007
    Applicant: SANYO EPSON IMAGING DEVICES CORP.
    Inventors: Masakatsu Higa, Hayato Kurasawa
  • Patent number: 7248321
    Abstract: Aspects of the invention can provide a transflective liquid crystal display device of vertical alignment mode capable of suitably controlling the direction that liquid crystal molecules are tilted. The liquid crystal display device can include a liquid crystal layer interposed between a pair of substrate and transmissive and reflective display regions in each dot region. An insulating film for varying the thickness of the liquid crystal layer in the reflective and transmissive display regions is provided. On a substrate having the insulating film formed thereon, an electrode slit for controlling the alignment of the liquid crystal molecules can be formed in the reflective display region. Similarly, a convex portion for controlling the alignment of the liquid crystal molecules can be formed in the transmissive display region.
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: July 24, 2007
    Assignee: Seiko Epson Corporation
    Inventor: Masakatsu Higa
  • Publication number: 20070115411
    Abstract: An upper polarizing plate is provided on the outer surface of an upper substrate, and a lower polarizing plate is provided on the outer surface of a lower substrate. Also, a retardation layer having a phase shift of a quarter wavelength, and a protective layer are provided in turn only on reflective display regions of the inner surface of the lower substrate so that with no voltage applied, the phase shifts of a liquid crystal layer in transmissive display regions and the reflective display regions are set to a half wavelength and a quarter wavelength, respectively. Therefore, the present invention provides a transflective liquid crystal display device having enhanced display brightness in a transmission mode and excellent visibility.
    Type: Application
    Filed: December 12, 2006
    Publication date: May 24, 2007
    Applicant: Seiko Epson Corporation
    Inventors: Kinya Ozawa, Masakatsu Higa, Chiyoaki Iijima
  • Publication number: 20070109473
    Abstract: A liquid crystal device includes a pair of substrates and a liquid crystal layer held between the substrates and containing a liquid crystal having negative dielectric anisotropy. The liquid crystal layer includes subpixels, each including a plurality of transmissive display regions and a reflective display region that are arranged in a predetermined direction. The transmissive display regions are disposed at the ends of each subpixel in the direction in which the transmissive and reflective display regions are arranged. The liquid crystal device further includes a thickness-adjusting layer disposed between at least one of the substrates and the liquid crystal layer so that the liquid crystal layer is thinner in the reflective display region than in the transmissive display regions.
    Type: Application
    Filed: September 21, 2006
    Publication date: May 17, 2007
    Applicant: SANYO EPSON IMAGING DEVICES CORPORATION
    Inventors: Masakatsu Higa, Joji Nishimura
  • Patent number: 7218363
    Abstract: An upper polarizing plate is provided on the outer surface of an upper substrate, and a lower polarizing plate is provided on the outer surface of a lower substrate. Also, a retardation layer having a phase shift of a quarter wavelength, and a protective layer are provided in turn only on reflective display regions of the inner surface of the lower substrate so that with no voltage applied, the phase shifts of a liquid crystal layer in transmissive display regions and the reflective display regions are set to a half wavelength and a quarter wavelength, respectively. Therefore, the present invention provides a transflective liquid crystal display device having enhanced display brightness in a transmission mode and excellent visibility.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: May 15, 2007
    Assignee: Seiko Epson Corporation
    Inventors: Kinya Ozawa, Masakatsu Higa, Chiyoaki Iijima
  • Publication number: 20070008470
    Abstract: Aspects of the invention can provide a transflective liquid crystal display device of vertical alignment mode capable of suitably controlling the direction that liquid crystal molecules are tilted. The liquid crystal display device can include a liquid crystal layer interposed between a pair of substrate and transmissive and reflective display regions in each dot region. An insulating film for varying the thickness of the liquid crystal layer in the reflective and transmissive display regions is provided. On a substrate having the insulating film formed thereon, an electrode slit for controlling the alignment of the liquid crystal molecules can be formed in the reflective display region. Similarly, a convex portion for controlling the alignment of the liquid crystal molecules can be formed in the transmissive display region.
    Type: Application
    Filed: September 18, 2006
    Publication date: January 11, 2007
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Masakatsu Higa
  • Publication number: 20060267891
    Abstract: A liquid crystal device includes first and second substrates which are arranged so as to face each other with a liquid crystal layer interposed therebetween, and first and second electrodes which are provided on the first substrate facing the liquid crystal layer. The liquid crystal layer is driven by electric fields generated between the first and second electrodes. A reflective display region for reflective display and a transmissive display region for transmissive display are provided in each of a plurality of subpixel regions. A liquid-crystal-layer-thickness-adjusting layer is provided in at least the reflective display region so as to vary the thickness of the liquid crystal layer in the subpixel region. A gap between the first and second electrodes in a main direction of an electric field in the transmissive display region is narrower than a gap between the first and second electrodes in a main direction of an electric field in the reflective display region.
    Type: Application
    Filed: May 22, 2006
    Publication date: November 30, 2006
    Applicant: SANYO EPSON IMAGING DEVICES CORPORATION
    Inventors: Joji Nishimura, Masakatsu Higa
  • Publication number: 20060197894
    Abstract: A liquid crystal device includes a first substrate, a second substrate that is disposed to face the first substrate, a liquid crystal layer that is interposed between the first substrate and the second substrate, a plurality of first signal lines and a plurality of second signal lines that extend in directions intersecting each other in a surface of each of the substrates, and a plurality of pixels that are driven via pixel switching elements disposed to correspond to intersections of the plurality of first signal lines and the plurality of second signal lines. Each of the plurality of pixels has a transmissive display region that emits light incident from the second substrate to the first substrate, and reflective display regions that reflect light incident from the first substrate. The liquid crystal layer has liquid crystal having negative dielectric constant anisotropy.
    Type: Application
    Filed: December 12, 2005
    Publication date: September 7, 2006
    Applicant: Sanyo Epson Imaging Devices Corp.
    Inventors: Masakatsu Higa, Masahiro Horiguchi, Hayato Kurasawa
  • Publication number: 20060050209
    Abstract: A liquid crystal display device includes a pair of substrate; a liquid crystal layer that is formed between the pair of substrates, and that is composed of liquid crystal having negative dielectric anisotropy, the liquid crystal being vertically aligned in an initial state; dot regions each having a transmissive display region and a reflective display region; a liquid-crystal-layer-thickness adjusting layer that is provided between the liquid crystal layer and at least one of the pair of substrates to make the thickness of the liquid crystal layer in the reflective display region smaller than the thickness of the liquid crystal layer in the transmissive display region; a color filter layer that includes plural types of colored layers having different colors corresponding to the respective dot regions, and that is provided on at least one of the pair of substrates; and alignment regulators that are provided on an inner surface of at least one of the pair of substrates to regulate the alignment of the liquid cr
    Type: Application
    Filed: August 12, 2005
    Publication date: March 9, 2006
    Inventor: Masakatsu Higa
  • Publication number: 20050248712
    Abstract: A liquid crystal display device includes: a pair of substrates including an element substrate and a counter substrate; and a liquid crystal layer interposed between the pair of substrates, wherein the liquid crystal layer is composed of liquid crystals each having a negative dielectric anisotropy, indicating that an initial oriented state is vertically-oriented, wherein the element substrate includes a switching element, an insulating layer formed on the switching element, and a pixel electrode formed on the insulating layer, wherein the pixel electrode has a plurality of island-shaped portions and a plurality of branch-shaped portions connecting between the plurality of island-shaped portions, and the switching element and the pixel electrode are electrically connected to each other via a contact hole formed in the insulating layer, wherein a spacer for defining the thickness of the liquid crystal layer is provided at the side of the liquid crystal layer of at least one substrate of the pair of substrates, a
    Type: Application
    Filed: May 2, 2005
    Publication date: November 10, 2005
    Inventors: Masakatsu Higa, Masahiro Horiguchi
  • Publication number: 20050243231
    Abstract: A liquid crystal device includes a pair of substrates including a first substrate and a second substrate and a liquid crystal layer having a negative dielectric anisotropy and interposed between the first and second substrates. The first substrate includes a data line, a switching device connected to the data line, an insulating film formed on the data line and the switching device, a pixel electrode formed on the insulating film, and a contact hole to which the switching device and a wire extending from the pixel electrode are connected.
    Type: Application
    Filed: April 14, 2005
    Publication date: November 3, 2005
    Inventors: Masahiro Horiguchi, Masakatsu Higa
  • Publication number: 20050078243
    Abstract: Aspects of the invention can provide a transflective liquid crystal display device of vertical alignment mode capable of suitably controlling the direction that liquid crystal molecules are tilted. The liquid crystal display device can include a liquid crystal layer interposed between a pair of substrate and transmissive and reflective display regions in each dot region. An insulating film for varying the thickness of the liquid crystal layer in the reflective and transmissive display regions is provided. On a substrate having the insulating film formed thereon, an electrode slit for controlling the alignment of the liquid crystal molecules can be formed in the reflective display region. Similarly, a convex portion for controlling the alignment of the liquid crystal molecules can be formed in the transmissive display region.
    Type: Application
    Filed: August 3, 2004
    Publication date: April 14, 2005
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Masakatsu Higa
  • Publication number: 20040004681
    Abstract: An upper polarizing plate 36 is provided on the outer surface of an upper substrate 14, and a lower polarizing plate 28 is provided on the outer surface of a lower substrate 13. Also, a retardation layer 20 having a phase shift of a quarter wavelength, and a protective layer 21 are provided in turn only on reflective display regions R of the inner surface of the lower substrate 13 so that with no voltage applied, the phase shifts of a liquid crystal layer 16 in transmissive display regions T and the reflective display regions R are set to a half wavelength and a quarter wavelength, respectively. Therefore, the present invention provides a transflective liquid crystal display device having improved display brightness in a transmission mode and excellent visibility.
    Type: Application
    Filed: March 12, 2003
    Publication date: January 8, 2004
    Applicant: Seiko Epson Corporation
    Inventors: Kinya Ozawa, Masakatsu Higa, Chiyoaki Iijima
  • Patent number: 6295102
    Abstract: A pair of transparent film substrates are provided. A transparent electrode and an orientation film are formed on each of the pair of transparent film substrates in sequence. A liquid crystal is inserted between the pair of film substrates. An orientation process is performed on each of the orientation films such that a visual-angle direction in which a maximum contrast is obtained is a six-o'clock direction or a twelve-o'clock direction based on a direction of the short hand of a clock. Each of the pair of film substrates is an optically anisotropic body, having a retardation value in the range of 5 to 30 nm in the plane of the film substrates. Assuming that long-axis directions denote directions parallel to the longest side of the periphery of the liquid-crystal shutter, the lagging-axis directions in the plane of the film substrates are approximately parallel to the long-axis directions.
    Type: Grant
    Filed: May 16, 2000
    Date of Patent: September 25, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Masakatsu Higa, Hisao Takahashi, Hiroyuki Sakayori
  • Patent number: 6233030
    Abstract: A liquid crystal display apparatus includes first and second transparent substrates having optical anisotropy, a super twisted nematic liquid crystal body including liquid crystal molecules, an orientation device configured to urge the liquid crystal molecules to orient in a first direction in the inner surface of the first transparent substrate and in a second direction in the inner surface of the second transparent substrate, at least one phase retarder plate and at least one polarizing plate, wherein an angle between an absorption axis of the at least one polarizing plate and a direction of the largest refraction index of the at least one phase retarder plate adjacent to the at least one polarizing plate is 45°±22.5°, an angle between an absorption axis of the at least one polarizing plate and an orientation direction of the liquid crystal molecules in the inner surface of the second substrates adjacent to the polarizing plate is 45°±22.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: May 15, 2001
    Assignee: Ricoh Co., Ltd.
    Inventors: Toshio Oh-Ide, Masakatsu Higa
  • Patent number: 6151088
    Abstract: A novel liquid crystal display apparatus comprising: a liquid crystal cell having a structure in which a liquid crystal layer is sandwiched between a pair of transparent substrates each having at least one electrode, and liquid crystal molecules in said liquid crystal layer are oriented substantially in parallel to the surface of said substrate and twisted at an angle in the thickness direction of said liquid crystal layer when the voltage is not applied, a pair of polarizers disposed so as to sandwich said liquid crystal cell there between, wherein the angle of the polarized light transmission axis of said polarizer to the orientation of liquid crystal molecules in the middle of said liquid crystal layer is less than 10.degree..
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: November 21, 2000
    Assignee: Ricoh Co., Ltd.
    Inventor: Masakatsu Higa
  • Patent number: 5844648
    Abstract: An STN-type liquid crystal display element employing a couple of plastic films having transparent electrodes and alignment films formed thereon as a substrate is described.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: December 1, 1998
    Assignee: Ricoh Company, Ltd.
    Inventor: Masakatsu Higa