Patents by Inventor Atsuko Kamada

Atsuko Kamada 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).

  • Color filter and photomask to be employed for the manufacture of color filter
    Patent number: 8367280
    Abstract: A color filter including a first photo-spacer, and a second photo-spacer having a smaller film thickness than that of the first photo-spacer, wherein the second photo-spacer has a cross-sectional configuration whose longitudinal width is made greater than the lateral width. These photo-spacers are formed by making use of a photomask which includes a first aperture pattern for forming the first photo-spacer, a second aperture pattern for forming the second photo-spacer which has a smaller film thickness than that of the first photo-spacer, wherein an aperture of the second aperture pattern has a lateral width in the range 2.0-10.0 ?m and the ratio of lateral width to longitudinal width is confined to 11.25 or more.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: February 5, 2013
    Assignee: Toppan Printing Co., Ltd.
    Inventors: Atsuko Kamada, Ryuji Kawamoto, Junichi Shiraishi
  • Liquid crystal display device and color filter for liquid crystal display device
    Patent number: 8269921
    Abstract: A liquid crystal display device which includes a backlight device provided with an LED, and a color filter having colored layers of plural colors including a green layer, wherein the green layer of the color filter contains brominated zinc phthalocyanine green pigment and a dielectric loss tangent of the green layer at a driving frequency of a liquid crystal display device is confined to not more than 0.02.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: September 18, 2012
    Assignee: Toppan Printing Co., Ltd.
    Inventors: Satoshi Ohkuma, Atsuko Kamada, Yoshiko Ishimaru, Kenji Muneuchi, Hidesato Hagiwara, Takashi Yamauchi, Noriko Asahi
  • Liquid crystal display device and color filter for liquid crystal display device
    Publication number: 20100271569
    Abstract: A liquid crystal display device which includes a backlight device provided with an LED, and a color filter having colored layers of plural colors including a green layer, wherein the green layer of the color filter contains brominated zinc phthalocyanine green pigment and a dielectric loss tangent of the green layer at a driving frequency of a liquid crystal display device is confined to not more than 0.02.
    Type: Application
    Filed: July 7, 2010
    Publication date: October 28, 2010
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Satoshi Ohkuma, Atsuko Kamada, Yoshiko Ishimaru, Kenji Muneuchi, Hidesato Hagiwara, Takashi Yamauchi, Noriko Asahi
  • Color filter and photomask to be employed for the manufacture of color filter
    Publication number: 20090015957
    Abstract: A color filter including a first photo-spacer, and a second photo-spacer having a smaller film thickness than that of the first photo-spacer, wherein the second photo-spacer has a cross-sectional configuration whose longitudinal width is made greater than the lateral width. These photo-spacers are formed by making use of a photomask which includes a first aperture pattern for forming the first photo-spacer, a second aperture pattern for forming the second photo-spacer which has a smaller film thickness than that of the first photo-spacer, wherein an aperture of the second aperture pattern has a lateral width in the range 2.0-10.0 ?m and the ratio of lateral width to longitudinal width is confined to 11.25 or more.
    Type: Application
    Filed: August 13, 2008
    Publication date: January 15, 2009
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Atsuko Kamada, Ryuji Kawamoto, Junichi Shiraishi