Patents by Inventor Tadayoshi Matsui

Tadayoshi Matsui 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).

  • Data driver for display device, test method and probe card for data driver
    Patent number: 8217923
    Abstract: A data driver of a display device includes: a DAC (Digital Analog Converter) outputting a drive signal for driving a signal line of a displaying unit; an amplifier amplifying the drive signal outputted by the DAC and outputting the drive signal to the signal line; a repair amplifier having an input and an output, wherein the signal line is separated by a breakage point into a connected data line connected to the amplifier and a disconnected data line not connected to the amplifier, and the input of the repair amplifier is connected to the connected data line and the output of the repair amplifier is connected to the disconnected data line; and a switch supplying the drive signal to the input of the repair amplifier for testing the repair amplifier. An output delay test for the repair amplifier can be performed under a condition similar to that of the amplifier.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: July 10, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Tadayoshi Matsui
  • Data driver for display device, test method and probe card for data driver
    Publication number: 20090015572
    Abstract: A data driver of a display device includes: a DAC (Digital Analog Converter) outputting a drive signal for driving a signal line of a displaying unit; an amplifier amplifying the drive signal outputted by the DAC and outputting the drive signal to the signal line; a repair amplifier having an input and an output, wherein the signal line is separated by a breakage point into a connected data line connected to the amplifier and a disconnected data line not connected to the amplifier, and the input of the repair amplifier is connected to the connected data line and the output of the repair amplifier is connected to the disconnected data line; and a switch supplying the drive signal to the input of the repair amplifier for testing the repair amplifier. An output delay test for the repair amplifier can be performed under a condition similar to that of the amplifier.
    Type: Application
    Filed: July 8, 2008
    Publication date: January 15, 2009
    Applicant: NEC Electronics Corporation
    Inventor: Tadayoshi Matsui
  • Driver circuit of display unit separating amplifier and output terminal in response to test signal and method of controlling the same
    Publication number: 20080238905
    Abstract: A drive circuit of a display unit includes an output circuit. The output circuit has an amplifier which amplifies an analog signal voltage according to a digital image signal, and a switch which turns off to isolate an output of the amplifier from an output terminal in response to a test signal.
    Type: Application
    Filed: February 26, 2008
    Publication date: October 2, 2008
    Applicant: NEC ELECTRONICS CORPORATION
    Inventor: Tadayoshi Matsui