Patents by Inventor Kotoyoshi Takahashi

Kotoyoshi Takahashi 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: 6639590
    Abstract: The present invention permits quick removal of charge stored in a liquid crystal layer, without depending upon characteristics of individual devices. This is achieved by providing a detector that detects the turning-off of a power supply, and a connection device that, upon detection of the turning-off of the power supply by the detector, connects to a predetermined line either or both of scanning lines to which scanning signals are supplied and data lines to which data signals are supplied, and connecting the predetermined line to a constant potential.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: October 28, 2003
    Assignee: Seiko Epson Corporation
    Inventors: Kotoyoshi Takahashi, Hisanori Kawakami
  • Publication number: 20020196223
    Abstract: The present invention permits quick removal of charge stored in a liquid crystal layer, without depending upon characteristics of individual devices. This is achieved by providing detecting means that detects the turning-off of a power supply, and connecting means that, upon detection of the turning-off of the power supply by the detecting means, connects to a predetermined line either or both of scanning lines to which scanning signals are supplied and data lines to which data signals are supplied, and connecting the predetermined line to a constant potential.
    Type: Application
    Filed: April 16, 1999
    Publication date: December 26, 2002
    Inventors: KOTOYOSHI TAKAHASHI, HISANORI KAWAKAMI
  • Patent number: 6297792
    Abstract: The invention prevents crosstalk of preceding data and to improve contrast in a liquid crystal display panel using a two-terminal type non-linear element such as a MIM element even when a charge and discharge drive method is used as a method of driving the liquid crystal display panel. A scanning signal is formed of a signal in a charging mode and a signal a discharging mode. A charging period in which the voltage value of a first selecting voltage in the charging mode is applied is set as a predetermined period in a first horizontal period. An overcharging period in which the voltage value of a precharge voltage in the discharging mode is applied is set as the first half of a second horizontal period vertical period after the first horizontal period, and a discharging period in which a second selecting voltage is applied is set as the second half of the second horizontal period.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: October 2, 2001
    Assignee: Seiko Epson Corporation
    Inventor: Kotoyoshi Takahashi
  • Patent number: 5661579
    Abstract: An electro-optical device, such as a liquid crystal display device, that utilizes MIM-type or other nonlinear pixel driver elements having a first conductor, an insulator, and a second conductor, with a ratio of the capacitance or surface area of pixel electrodes to that of the overlapping parts of first and second conductors and an insulator forming the nonlinear driver being set to maximize contrast at normal use temperatures even when these ratios are changed to nearby values. This results in more efficient pixel driving and good display performance without making the capacitance of the nonlinear driver extremely small.
    Type: Grant
    Filed: January 6, 1995
    Date of Patent: August 26, 1997
    Assignee: Seiko Epson Corporation
    Inventor: Kotoyoshi Takahashi
  • Patent number: 5396353
    Abstract: An opto-electrical apparatus, such as, a liquid crystal display device, comprises a pixel electrode driving element a first conductor, an insulator and a second conductor formed in stacked sequence on the substrate with the insulator comprising a thicker barrier layer atop the first conductor compared to the side portions thereof. The second conductor is formed in two locations on the insulating side portions of the insulator as well as a portion of the top surface comprising the barrier layer. As a result, a pair of nonlinear devices are formed relative to the same insulator and are connected between a pixel electrode and inter-device interconnect so that an electrically aligned, series connected pair of MIM devices with opposite polarity formation both having nonlinear current/voltage characteristics.
    Type: Grant
    Filed: June 24, 1992
    Date of Patent: March 7, 1995
    Assignee: Seiko Epson Corporation
    Inventors: Kotoyoshi Takahashi, Takeyoshi Ushiki
  • Patent number: 5253092
    Abstract: A lateral MIM structure for use in liquid crystal and other optical display devices and method of manufacture, which eliminates deviations in element operating characteristics, especially for pixel electrodes, by utilizing top edges of the input signal conductor as active MIM element areas in combination with side conductor surfaces. The lateral MIM structure is made by electrically contouring insulation formed on a first conductor to have a lower resistance where it covers at least one side surface and top edge to allow MIM electrical interactions and than where it covers the remaining top surface so as to substantially prevent electrical interactions over this surface. A second conductor is then deposited on the insulation layer. This is accomplished by forming one insulation material on the top of the input conductor using a positive photoresist and etch-back procedure, followed by forming a second insulation layer over the first and the conductor side surfaces and top edges.
    Type: Grant
    Filed: January 22, 1992
    Date of Patent: October 12, 1993
    Assignee: Seiko Epson Corporation
    Inventor: Kotoyoshi Takahashi
  • Patent number: 5246468
    Abstract: The invention is concerned with a production process for a lateral metal-insulator-metal (MIM) device for use in liquid crystal displays. A conductive pattern is formed on a transparent substrate, followed by formation of a barrier layer insulator on top of the conductive pattern. Positive photoresist is applied and light is passed through the back side of the substrate. The photoresist is developed and the barrier layer insulator is etched until the sides of the conductive pattern are exposed. A thin insulator layer is formed on the exposed sides. The lateral MIM structure is completed with the formation of a second conductive layer, or electrode, over the thin insulator. With the method of this invention, breakage of the electrode does not occur because the underlying conductor is not undercut from etching, as occurs in prior art MIM production processes.
    Type: Grant
    Filed: July 5, 1991
    Date of Patent: September 21, 1993
    Assignee: Seiko Epson Corporation
    Inventors: Kotoyoshi Takahashi, Takeyoshi Ushiki
  • Patent number: 5119217
    Abstract: An active matrix substrate including a matrix of picture elements arranged in columns and rows with each picture element having an associated non-linear element is provided. Interpixel connections between the non-linear elements and row electrode include an equivalent capacitor. The capacitor is formed by depositing a second metal film of low resistance on the row electrode. This forms a large area MIM of the first metal row electrode, insulating film and second metal film. Signals are applied to the second metal film.
    Type: Grant
    Filed: May 18, 1990
    Date of Patent: June 2, 1992
    Assignee: Seiko Epson Corporation
    Inventor: Kotoyoshi Takahashi
  • Patent number: 4929059
    Abstract: A non-linear element is formed on a substrate as a laminate including a first electric conductor, a second electric conductor and an insulator sandwiched therebetween. A protective layer is formed on the substrate in the vicinity of the first electric conductor without coming in electric contact with the first electric conductor. The second electric conductor extends to the protective layer and is adhered thereto.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: May 29, 1990
    Assignee: Seiko Epson Corporation
    Inventor: Kotoyoshi Takahashi