Patents by Inventor Michiaki Sakamoto

Michiaki Sakamoto 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: 20120256893
    Abstract: An image display device is provided which suppresses discomfort “flickering” in a process of renewing a screen to realize multiple gray level displaying including an intermediate color. Electrophoretic particles are made up of n-kinds of charged particles C1, . . . , Ck, . . . , Cn having colors different from one another and threshold voltages to initiate an electrophoresis. Each of charged particles C1, . . . , Ck, . . . , Cn satisfies a relationship characteristic of threshold value voltage of charged particles> . . . >threshold value voltage of charged particle Ck> . . . >threshold value voltage of charged particle Cn. A voltage applying unit, at time of renewing a screen, renews a screen to a next screen having a desired density by a transition of a relative color density of each charged particle to a relative color density of a corresponding intermediate state in order of charged particle C1> . . . >Ck, . . . , Cn for a voltage driving waveform of each charged particle.
    Type: Application
    Filed: April 9, 2012
    Publication date: October 11, 2012
    Applicant: NLT TECHNOLOGIES, LTD.
    Inventors: Michiaki SAKAMOTO, Koji SHIGEMURA, Setsuo KANEKO
  • Patent number: 8284356
    Abstract: An LCD device includes a reflective area in each pixel. A reflection film having a convex-concave surface is provided in the reflective area, film in cross section configuration is formed. Each pixel includes a pixel electrode and a common electrode for applying a lateral electric field on a LC layer. The inclination angle of the reflection film has an inclination angle distribution, wherein the angle component in an area corresponding to the electrodes has a lower angle distribution than the angle components in an area corresponding to a gap between adjacent two of the electrodes.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: October 9, 2012
    Assignee: NLT Technologies, Ltd.
    Inventors: Kenichirou Naka, Michiaki Sakamoto, Hiroshi Nagai, Kenichi Mori
  • Publication number: 20120200610
    Abstract: An image display device expresses multiple colors including intermediate colors and an electrophoretic particle making up the image display device includes n-kinds of (n>2) charged particles each having colors and threshold value voltages each being different from one another. A specified period during which a voltage is applied includes a resetting period for applying a resetting voltage, a first, . . . , kth, . . . , nth voltage applying periods and a voltage to be applied includes a resetting voltage, OV, first voltage (absolute value) to be applied within the first voltage applying period, OV, kth voltage (absolute value) to be applied within kth voltage applying period, and OV voltage, nth voltage (absolute value) to be applied within an nth voltage applying period. Relationships: |first applied voltage|>|kth applied voltage|>|nth voltage| and |first applied voltage|<|kth voltage|<|nth voltage| are satisfied.
    Type: Application
    Filed: February 8, 2012
    Publication date: August 9, 2012
    Applicant: NLT TECHNOLOGIES, LTD.
    Inventors: Michiaki SAKAMOTO, Koji SHIGEMURA, Setsuo KANEKO, Tetsushi SATO, Kenichi TAKATORI
  • Publication number: 20120188235
    Abstract: An image display device includes region of interest extraction unit, parallax image generation unit and 3D image display unit. Region of interest extraction unit generates depth image signal by depth image conversion employing depth threshold, depth image signal including information on distance in three-dimensional space between viewpoint and each pixel of two-dimensional image including region of interest desired to be noted by observer, depth image conversion being such that depth value indicating distance between viewpoint and each pixel of two-dimensional image is converted to depth value for 2D display when depth value is equal to or larger than depth threshold. Parallax image generation unit generates both-eye parallax image having parallax in region of interest alone, from two-dimensional image and image obtained by conversion of region of interest image representing region of interest at each of both-eye viewpoints, based on two-dimensional image and depth image signal.
    Type: Application
    Filed: January 26, 2012
    Publication date: July 26, 2012
    Applicant: NLT TECHNOLOGIES, LTD.
    Inventors: Di WU, Michiaki SAKAMOTO
  • Patent number: 8194211
    Abstract: A LCD unit includes a reflective area and a transmissive area in each pixel, which are driven by respective drive electrode assemblies. A first substrate and a second substrate that sandwich therebetween a LC layer include respective shied films in the boundary area between the reflective area and the transmissive area.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: June 5, 2012
    Assignee: NLT Technologies, Ltd.
    Inventors: Hiroshi Nagai, Michiaki Sakamoto, Kenichirou Naka, Kenichi Mori
  • Patent number: 8139184
    Abstract: An LCD device includes a reflective area in each pixel. A reflection film having a convex-concave surface is provided in the reflective area, film in cross section configuration is formed. Each pixel includes a pixel electrode and a common electrode for applying a lateral electric field on a LC layer. The inclination angle of the reflection film has an inclination angle distribution, wherein the angle component in an area corresponding to the electrodes has a lower angle distribution than the angle components in an area corresponding to a gap between adjacent two of the electrodes.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: March 20, 2012
    Assignee: NLT Technologies Ltd.
    Inventors: Kenichirou Naka, Michiaki Sakamoto, Hiroshi Nagai, Kenichi Mori
  • Publication number: 20120034721
    Abstract: A semi-transmissive-type liquid crystal display device is provided which is capable of preventing an electric erosion reaction between a reflective film made of Al (aluminum) or an Al alloy and a transparent electrode film made of ITO or a like (Indium Tin Oxide) and of inhibiting occurrence of a flicker caused by a residual DC (Direct Current) voltage in the reflective film. In the semi-transmissive-type of a liquid crystal display device, a transmissive region to provide light from a backlight source and a reflective region to receive ambient light are placed in a pixel region and a transparent electrode film is formed above a reflective film formed in the reflective region on an active matrix substrate with a second passivation film being interposed between the reflective film and the transparent electrode film.
    Type: Application
    Filed: August 11, 2011
    Publication date: February 9, 2012
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventors: Mamoru Okamoto, Michiaki Sakamoto, Osamu Sukegawa, Ken-Ichirou Naka, Shin-ichi Nakata, Masami Yamashita
  • Patent number: 8111360
    Abstract: A transflective LCD unit includes an array of pixels each including a reflective area and a transmissive area. The LC layer has an effective retardation of ?/4 in the reflective area, and an effective retardation of ?/2 in the transmissive area. A retardation film disposed in the reflective area provides a retardation of ?/2 to the light passed thereby. An angle of ? between the optical axis of the retardation film and the polarized direction of the light is in a range of 0 degree<?<22.5 degrees.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: February 7, 2012
    Assignee: NLT Technologies, Ltd.
    Inventors: Horoshi Nagai, Michiaki Sakamoto, Kenichi Mori, Kenichirou Naka
  • Patent number: 8089589
    Abstract: A semi-transmissive-type liquid crystal display device is provided which is capable of preventing an electric erosion reaction between a reflective film made of Al (aluminum) or an Al alloy and a transparent electrode film made of ITO or a like (Indium Tin Oxide) and of inhibiting occurrence of a flicker caused by a residual DC (Direct Current) voltage in the reflective film. In the semi-transmissive-type of a liquid crystal display device, a transmissive region to provide light from a backlight source and a reflective region to receive ambient light are placed in a pixel region and a transparent electrode film is formed above a reflective film formed in the reflective region on an active matrix substrate with a second passivation film being interposed between the reflective film and the transparent electrode film.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: January 3, 2012
    Assignee: NLT Technologies, Ltd.
    Inventors: Mamoru Okamoto, Michiaki Sakamoto, Osamu Sukegawa, Ken-Ichirou Naka, Shin-Ichi Nakata, Masami Yamashita
  • Publication number: 20110310098
    Abstract: An image display apparatus according to one aspect of the present invention that is capable of providing an image display apparatus is able to efficiently achieve 2D/3D mixed representation while suppressing data transmission amount. The image display apparatus refers to shape information 1002 and an area of interest image signal 1001 to change an area of interest in an image signal 1000 of a first viewpoint to an image signal of a second viewpoint which is a viewpoint different from the first viewpoint, to achieve 3D image display using the image signal of the second viewpoint that is obtained and the image signal 1000 of the first viewpoint.
    Type: Application
    Filed: March 12, 2010
    Publication date: December 22, 2011
    Applicants: NLT TECHNOLOGIES, LTD., NEC CORPORATION
    Inventors: Takahiro Kimoto, Shinichi Uehara, Ogi Go, Michiaki Sakamoto
  • Publication number: 20110285946
    Abstract: A liquid crystal display device including a first substrate, a second substrate facing and spaced away from the first substrate, a liquid crystal layer sandwiched between the first and second substrates, a switching device formed on the first substrate, a first electrically insulating film randomly patterned on the first substrate, a second electrically insulating film covering the first electrically insulating film therewith, and having a wavy surface, and a reflection electrode formed on the second electrically insulating film, and electrically connected to an electrode of the switching device, wherein a light passing through the second substrate and the liquid crystal layer is reflected at the reflection electrode, and the second electrically insulating film extends outwardly from the first electrically insulating film by a certain length at an end of a display region in which images are to be displayed, such that a step formed by the first and second electrically insulating films in the vicinity of the en
    Type: Application
    Filed: August 8, 2011
    Publication date: November 24, 2011
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventors: Hironori KIKKAWA, Michiaki SAKAMOTO, Yuichi YAMAGUCHI, Hidenori IKENO, Fumihiko MATSUNO
  • Patent number: 8064030
    Abstract: A liquid crystal display device includes an array of pixels each including a plurality of sub-pixels, a plurality of pixel electrodes disposed in the respective sub-pixels, and a plurality of common electrodes disposed in the respective sub-pixels. The common electrode disposed in each of the sub-pixels in one of the pixels on each row is connected to the common electrodes disposed in the corresponding sub-pixels in the others of the pixels on the each row, to form a group of common electrodes connected together.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: November 22, 2011
    Assignee: NED LCD Technologies, Ltd.
    Inventors: Michiaki Sakamoto, Kenichi Mori, Kenichirou Naka, Hiroshi Nagai
  • Publication number: 20110267333
    Abstract: An active-matrix bistable display panel is provided in which a pixel electrode is formed at each intersection of each of a plurality of scanning lines in a row direction and each of a plurality of signal lines in a column direction and a display state is made to occur depending on a voltage of each of the pixel electrodes, a signal-line driving unit is provided in which the plurality of signal lines is connected to a plurality of terminals and image inputs are sequentially divided into a plurality of image inputs and a plurality of image signals are supplied sequentially to the plurality of terminals in a time-division manner, and a scanning-line driving unit is provided in which each scanning line making up the plurality of groups is sequentially driven for each of the groups, wherein each of TFTs (Thin Film Transistors) is made active so as to supply an image voltage to each of pixel electrodes.
    Type: Application
    Filed: July 8, 2011
    Publication date: November 3, 2011
    Applicant: NEC LCD TECHNOLOGIES, LTD
    Inventors: Michiaki SAKAMOTO, Yuji KONDO, Nobuaki HONBO
  • Patent number: 8049848
    Abstract: A liquid crystal display having a wide viewing angle and easily manufactured. The liquid crystal display comprises an upper substrate and a lower substrate, and a liquid crystal material disposed between the upper substrate and the lower substrate. The liquid crystal display has a conductive protrusion disposed on the surface of the upper substrate opposing to the lower substrate. The conductive protrusion is disposed over a scanning electrode line or a signal electrode line and has the same potential as that of the upper electrode. As another structure, each of pixel electrodes on the lower substrate has a smaller area than that of a common electrode on the upper substrate and is covered by the common electrode, and each of the pixel electrodes comprises an electrode portion having approximately symmetrical shape.
    Type: Grant
    Filed: September 23, 2009
    Date of Patent: November 1, 2011
    Assignee: NEC Corporation
    Inventors: Ken-ichi Takatori, Masayoshi Suzuki, Toshiya Ishii, Teruaki Suzuki, Hiroshi Kanoh, Ken Sumiyoshi, Michiaki Sakamoto, Mamoru Okamoto, Yuji Yamamoto, Hiroaki Matsuyama, Kiyomi Kawada, Seiji Suzuki, Yoshihiko Hirai
  • Patent number: 8035611
    Abstract: An electrophoretic display device is provided which is capable of preventing an afterimage and an image burn-in. Frames to make electrophoretic elements making up pictures of an active-matrix and a microcapsule-type electrophoretic display device be driven are divided into a plurality of white frames and black frames. The number of white frames to be used for writing on the electrophoretic elements by using a scanning driver and a data driver on one picture or between pictures is made to be equal to the number of black frames to be used for the writing and writing frames for particles having slow mobility responsive to variation in an electric field is provided last in the formation of the picture.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: October 11, 2011
    Assignee: NEC LCD Technologies, Ltd
    Inventor: Michiaki Sakamoto
  • Patent number: 8018538
    Abstract: To increase the aperture ratio of a transflective liquid crystal display device and suppress a light leakage. Provided is a transflective liquid crystal display device that includes: within a unit pixel, a reflective area including a pixel electrode and a common electrode as a pair and a reflector, and a transmissive area including a pixel electrode and a common electrode as a pair; a liquid crystal layer provided to the reflective area and the transmissive area; storage capacitances for the reflective area and the transmissive area provided in a lower layer of the reflector for changing a potential of the pixel electrode by following a potential of the common electrode; and a suppressing device for suppressing a light leakage in the liquid crystal layer when the pixel electrode is affected by a potential of the reflector due to capacitance coupling generated between the reflector and the pixel electrode.
    Type: Grant
    Filed: April 8, 2008
    Date of Patent: September 13, 2011
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Kenichi Mori, Michiaki Sakamoto, Hiroshi Nagai, Kenichirou Naka
  • Patent number: 8004490
    Abstract: An active-matrix bistable display panel is provided in which a pixel electrode is formed at each intersection of each of a plurality of scanning lines in a row direction and each of a plurality of signal lines in a column direction and a display state is made to occur depending on a voltage of each of the pixel electrodes, a signal-line driving unit is provided in which the plurality of signal lines is connected to a plurality of terminals and image inputs are sequentially divided into a plurality of image inputs and a plurality of image signals are supplied sequentially to the plurality of terminals in a time-division manner, and a scanning-line driving unit is provided in which each scanning line making up the plurality of groups is sequentially driven for each of the groups, wherein each of TFTs (Thin Film Transistors) is made active so as to supply an image voltage to each of pixel electrodes.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: August 23, 2011
    Assignee: NEC LCD Technologies, Ltd
    Inventors: Michiaki Sakamoto, Yuji Kondo, Nobuaki Honbo
  • Patent number: 7990501
    Abstract: A method for manufacturing a transflective type LCD having a first substrate provided thereon with a plurality of scanning lines and a plurality of signal lines which are substantially perpendicular to each other and a switching element arranged near each of intersections between said scanning lines and said signal lines, includes forming a reflection region having a reflection electrode film and a transmission region having a transparent electrode film in each pixel surrounded by said scanning lines and said signal lines, a liquid crystal being sandwiched at a gap between said first substrate and a second substrate which is arranged opposite to said first substrate, and forming an organic film having irregularities thereon below said reflection electrode film and said transparent electrode film to substantially the same film thickness.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: August 2, 2011
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Michiaki Sakamoto, Satoshi Ihida, Hidenori Ikeno, Masaki Shinohara, Shigeru Kimura, Kenji Morio, Kazurou Saeki
  • Patent number: 7982835
    Abstract: A transflective liquid crystal display device is provided with a liquid crystal layer sandwiched between a first substrate with an array of switching elements and a second substrate with a black matrix so as to form a first area for a normally black display and a second area for a normally white display A first electric potential difference formed between the black matrix and both of the first common electrode and the first pixel electrode formed in the first area on the first substrate is made to be smaller than a larger one of the second electric potential difference formed between the black matrix and both of the second common electrode and the second pixel electrode formed in the second area.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: July 19, 2011
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Kenichirou Naka, Hiroshi Nagai, Michiaki Sakamoto, Kenichi Mori, Kousuke Shibata
  • Patent number: 7982834
    Abstract: A liquid crystal display (LCD) device includes: a liquid crystal (LC) panel defining thereon an array of pixels each including a reflective area driven in a longitudinal electric field and a transmissive area driven in a lateral electric field; a quarter-wavelength retardation film disposed in the reflective area in front of a LC layer; and first and second polarizing films sandwiching therebetween the LC panel. The LC molecules in the LC layer have a major axis parallel or perpendicular to an optical axis of the first polarizing film disposed in front of the LC panel.
    Type: Grant
    Filed: August 4, 2008
    Date of Patent: July 19, 2011
    Assignee: NEC LCD Technologies, Ltd
    Inventors: Michiaki Sakamoto, Kenichi Mori