Patents by Inventor Akira Tamatani

Akira Tamatani 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: 6335779
    Abstract: A method of manufacturing an in-plane switching liquid crystal display apparatus which includes forming on a TFT array substrate, a plurality of scanning signal lines, a plurality of image signal lines each crossing the scanning signal lines, thin film transistors at each intersection of the scanning signal lines and image signal lines, liquid crystal driving electrodes opposing the liquid crystal driving electrodes, and common signal lines connected to the common electrodes. Further, the method includes opposing a counter substrate to the TFT array substrate, interposing a plurality of spacers in a gap between the TFT array substrate and the counter substrate, and interposing a sealing agent in the gap between the TFT array substrate and the counter substrate so as to adhere the TFT array substrate and the counter substrate at peripheral portions thereof.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: January 1, 2002
    Assignees: Mistubishi Denki Kaubshiki Kaisha, Advanced Display Inc.
    Inventors: Yasuhiro Morii, Fumio Matsukawa, Akira Tsumura, Shin Tahata, Masaya Mizunuma, Akira Tamatani, Masayuki Fujii, Yasuo Fujita
  • Publication number: 20010052959
    Abstract: A liquid crystal display device comprising a sealing material provided on a periphery of a substrate, projections formed by etching a film formed on the subtrate, and another substrate opposite the substrate being remote therefrom by a gap and being supported by the projections. An area occupying rate of the projections portions with respect to a region enclosed by the sealing material is not less than 0.0001 and not more than 0.003. It is possible to obtain a liquid crystal display device free of display blurs at the time of using the same in a high temperature condition and with which no bubbles are generated when using the same in a low temperature condition by setting the area occupying ratio for the columnar spacers to be optimal value.
    Type: Application
    Filed: March 12, 2001
    Publication date: December 20, 2001
    Applicant: ADVANCED DISPLAY INC.
    Inventors: Akira Tamatani, Yasunori Niwano
  • Publication number: 20010038430
    Abstract: A liquid crystal display of the present invention includes: a pair of substrates, at least one of which is transparent; a liquid crystal layer being interposed between said pair of substrates; electrodes for applying an electric field to liquid crystals molecules in said liquid crystal layer; active switching elements connected with said electrodes; an alignment film being formed on a surface of at least one of said pair of substrates, said surface being contacted with said liquid crystal layer; and an optical device for controlling a transmission of light in cooperation with alignment of said liquid crystal molecules in each pixel, said means being located on at least one said pair of substrates; wherein an aligning direction of each liquid crystal molecule in each pixel is ranged between −2 degree to +2 degrees with respect to an average aligning direction &thgr;1c of said liquid crystal layer.
    Type: Application
    Filed: April 5, 2001
    Publication date: November 8, 2001
    Applicant: ADVANCED DISPLAY INC.
    Inventors: Masaya Mizunuma, Akira Tamatani, Ken Nakashima
  • Patent number: 6313890
    Abstract: The present invention is directed to a liquid crystal display including: an active matrix liquid crystal display element; and a surface light source; the liquid crystal display element including a liquid crystal substance sandwiched between an electrode substrate and an counter substrate via alignment films; the electrode substrate having a surface formed with a matrix of pixel portion having switching elements surrounded by a plurality of image signal lines and scanning signal lines; wherein a transmittance distribution of the liquid crystal display element reduces a brightness distribution inconsistency in the surface light source; or more specifically; wherein Xmax is a maximum brightness value in a display region of the surface light source, Xmin is a minimum brightness value thereof, Zmax is a maximum brightness value of the liquid crystal display, and Zmin is a minimum brightness value thereof; and wherein the expression of Xmax/Xmin>Zmax/Zmin is satisfied.
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: November 6, 2001
    Assignee: Advanced Display Inc.
    Inventor: Akira Tamatani
  • Patent number: 6166795
    Abstract: A liquid crystal display apparatus of the present invention includes an array substrate, a counter substrate, and liquid crystal that is interposed and held by a space formed by maintaining the array substrate and the counter substrate at a specified interval in a parallel manner, the liquid crystal display apparatus being of in-plane switching in which voltage is impressed on a pair of electrodes disposed on the array substrate to generate an electric field substantially parallel with respect to the array substrate surface and in which liquid crystal is driven through in-plane switching of liquid crystal molecules, wherein the array substrate is formed with a conductive film layer on a surface opposite to the surface on which the pair of electrodes are disposed. Providing a liquid crystal display apparatus with no electric charged being stored on the substrate surface thereof and no afterimages appear.
    Type: Grant
    Filed: January 27, 1999
    Date of Patent: December 26, 2000
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Advanced Display Inc.
    Inventors: Masayuki Fujii, Fumio Matsukawa, Akira Tsumura, Shin Tahata, Masaya Mizunuma, Akira Tamatani, Yasuhiro Morii, Yasuo Fujita
  • Patent number: 6141078
    Abstract: The liquid crystal display apparatus of present invention includes a TFT array substrate on which there are formed scanning signal lines, image signal lines, thin film transistors, liquid crystal driving electrodes, common electrodes and common signal lines, a counter substrate which opposes the TFT array substrate, primary spacers for maintaining a gap between both substrates constant, secondary spacers for maintaining a gap in peripheral portions of both substrates constant, a seal member which is interposed in the gap between both substrates together with the secondary spacers and which adhere peripheral portions of both substrates, and a liquid crystal layer, wherein the in-plane retardation of the display apparatus (.DELTA.n).multidot.(d.sub.max -d.sub.min) is not less than 0 nm and not more than 20 nm, whereby variations in colors occurring in liquid crystal display apparatuses of IPS type which are due to unevenness of liquid crystal layers can be eliminated.
    Type: Grant
    Filed: January 27, 1999
    Date of Patent: October 31, 2000
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Advanced Display, Inc.
    Inventors: Yasuhiro Morii, Fumio Matsukawa, Akira Tsumura, Shin Tahata, Masaya Mizunuma, Akira Tamatani, Masayuki Fujii, Yasuo Fujita
  • Patent number: 5959712
    Abstract: A method of manufacturing a liquid crystal display element including steps of: (a) forming a electrode on a surface of at least one of an upper substrate and a lower substrate; (b) interposing a photocuring sealing material between a peripheral edge of the upper substrate and a peripheral edge of the lower substrate, and irradiating light energy for curing the photocuring sealing material, so that the upper substrate is bonded to the lower substrate in such a manner that a gap is interposed therebetween; and (c) injecting liquid crystal into the gap, wherein the light energy is irradiated while each temperature of the upper substrate and the lower substrate is controlled to 55.degree. C. or lower.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: September 28, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuhiro Morii, Akira Tamatani, Akira Tsumura, Shin Tahata, Masaya Mizunuma, Masayuki Fujii
  • Patent number: 5905553
    Abstract: A liquid crystal display composed of an array substrate; a color filter substrate; a liquid crystal material interposed therebetween; a plurality of parallely spaced gate bus lines; a plurality of parallely spaced source bus lines; a plurality of pixel electrodes; a plurality of colored layers; and a light shield portion; wherein at a central portion of the first pixel pattern, gravity center of first pixel portion provided at the central portion of the first pixel pattern corresponds to gravity center of second pixel portion provided at a central portion of the second pixel pattern; and wherein at an end portion of the first pixel pattern, with respect to each viewing angle to each pixel, each second distance between any two adjacent gravity centers of pixels provided in the second pixel pattern is reduced to be shorter by prescribed length than each corresponding first distance between any two adjacent gravity centers of pixels corresponding to gravity centers of pixels provided in the first pixel pattern,
    Type: Grant
    Filed: February 2, 1998
    Date of Patent: May 18, 1999
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Advanced Display Inc.
    Inventors: Fumio Matsukawa, Akira Tsumura, Shin Tahata, Masaya Mizunuma, Akira Tamatani, Yasuhiro Morii, Masayuki Fujii, Yasuo Fujita
  • Patent number: 5893625
    Abstract: A method for manufacturing a liquid crystal display device in which two transparent insulation substrates are adhered to each other and a liquid crystal is injected into an injection area defined by a seal pattern comprising sealing material. The method comprises the steps of: starting application of the sealing material to either one of the two substrates from a position different from a cutting position of the substrate to form a liquid crystal injection hole and a liquid crystal injection area, and ending the application at a position different from the cutting position to form the seal pattern; oppositely placing the two substrates, and pressing and adhering the two substrates with the sealing material; and cutting the adhered two substrates at a predetermined position and injecting the liquid crystal from the injection hole.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: April 13, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akira Tamatani, Shin Tahata, Yasuhiro Morii, Akira Tsumura, Masaya Mizunuma, Masayuki Fujii