Patents by Inventor Fuminao Matsumoto

Fuminao Matsumoto 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: 6414732
    Abstract: A color filter layer for a multicolor, liquid crystal display device which contains a plurality of color filters formed electrochemically on delineated stripes of transparent electrodes which are formed substantially parallel to each other on a transparent insulating substrate. The color filters are electrically conductive. A transparent resin material leveling layer fills gaps between the color filters.
    Type: Grant
    Filed: June 17, 1999
    Date of Patent: July 2, 2002
    Assignee: Ricoh Company, Ltd.
    Inventors: Fuminao Matsumoto, Akihiko Kanemoto, Tomohiro Inoue, Hiroshi Kondo
  • Patent number: 6068953
    Abstract: A color filter layer for a color liquid crystal display device is provided, including a plurality of color filters each formed on delineated stripes of transparent electrodes formed substantially parallel to each other on a transparent insulating substrate. These color filters are each electrochemically formed on the delineated stripes of transparent electrodes serf-aligned to the delineated stripes. In addition, a layer of transparent resin material is further provided as a leveling layer that is cured by being exposed to light incident from the backside of the substrate using the color filters as a mask and fills gap portions between the color filters.
    Type: Grant
    Filed: November 16, 1998
    Date of Patent: May 30, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Fuminao Matsumoto, Akihiko Kanemoto, Tomohiro Inoue, Hiroshi Kondo
  • Patent number: 6061042
    Abstract: A liquid crystal display device includes a liquid crystal display cell having a layer of a twisted-nematic liquid crystal material with a positive dielectric anisotropy constant and constructed such that a plurality of voltage potentials applied to the liquid crystal cell may firstly induce a Freedricksz transition of the liquid crystal material and then select either one of first and second metastable states caused by relaxation of the liquid crystal material succeeding the Freedricksz transition. A first voltage potential is adjusted higher than a threshold voltage necessary to cause changes from an initial state to the metastable states, a second voltage potential to select one of the metastable states is adjusted in comparison with a voltage potential necessary to switch between the metastable states, and a third voltage potential is applied as a modulation voltage during or succeeding the application of the second voltage potential.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: May 9, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyuki Takahashi, Kenji Kameyama, Yasuyuki Takiguchi, Akihiko Kanemoto, Fuminao Matsumoto, Kazuya Miyagaki
  • Patent number: 5969780
    Abstract: An insulating layer is formed on a plurality of electrodes formed on a plastic film substrate, the insulating layer having a plurality of electrode connecting holes formed therein. Electrodes of the plurality of electrodes are selectively connected to an external circuit via respective ones of the plurality of connecting holes. Conductive color filter layers are formed on the thus-connected electrodes by an electrochemical method. A value obtained as a result of subtracting a width of each one of the plurality of electrode connecting holes from a width of a respective one of the plurality of electrodes is large so that a position of the electrode connecting hole is maintained to correspond to a position of the electrode even when the plastic film substrate expands or contracts maximally.
    Type: Grant
    Filed: September 2, 1998
    Date of Patent: October 19, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Fuminao Matsumoto, Yasuyuki Takiguchi, Akihiko Kanemoto, Tomohiro Inoue
  • Patent number: 5831695
    Abstract: An active-matrix liquid crystal display has a metal-insulator-metal (MIM) switching device provided in each of the pixels of the display. The MIM switching device includes a hard carbon film disposed as an insulating layer between a first and a second conductor and exhibits excellent and reliable switching operations, thereby providing liquid crystal displays with high display quality and low power consumption.
    Type: Grant
    Filed: October 8, 1996
    Date of Patent: November 3, 1998
    Assignee: Ricoh Company, Ltd.
    Inventor: Fuminao Matsumoto