Patents by Inventor Tetsuo Fukami

Tetsuo Fukami 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).

  • Publication number: 20070115240
    Abstract: A display device includes a plurality of rows of display pixels, a driver circuit which drives the plurality of rows of display pixels in units of a predetermined number of rows, and a control circuit which controls the driver circuit in such a manner as to alternately execute non-video signal write for simultaneously driving the predetermined number of rows of display pixels and writing non-video signals, and video signal write for successively driving the predetermined number of rows of display pixels and writing video signals. The control circuit assigns, in the video signal write, a first period to the row of display pixels which are first driven, and a second period to each of the other rows of display pixels, and sets the first period to be longer than the second period.
    Type: Application
    Filed: November 2, 2006
    Publication date: May 24, 2007
    Inventors: Yukio Tanaka, Tetsuo Fukami
  • Publication number: 20070103425
    Abstract: A liquid crystal display device which includes a plurality of OCB liquid crystal pixels arrayed substantially in a matrix, and a driver circuit which cyclically writes a non-video signal and a video signal as a pixel voltage in each of the liquid crystal pixels. The liquid crystal display device further includes a control circuit which sets a first period and a second period different in length from the first period such that a total time length of the first period and the second period does not exceed one frame period, and controls the driver circuit to execute write of the non-video signal for the liquid crystal pixels in the first period and to execute write of the video signal for the liquid crystal pixels PX in the second period.
    Type: Application
    Filed: September 26, 2006
    Publication date: May 10, 2007
    Inventors: Yukio Tanaka, Kenji Nakao, Tetsuo Fukami, Kazuhiro Nishiyama
  • Patent number: 7034790
    Abstract: A method of driving a liquid crystal display and the liquid crystal display of the present invention are such that in a liquid crystal display in which video signals are written onto a plurality of pixels frame by frame (Tf), voltages corresponding to the video signals are held in the pixels, and a modulation degree of the liquid crystal layer in an alignment state for display is controlled in accordance with the held voltages, thereby displaying an image, a backward-transition-prevention voltage ?V for preventing backward transition of a liquid crystal layer is temporalily superposed on the voltages (Vd1–Vdn) corresponding to the video signals in a hold period (Th) of the voltages (Vd1–Vdn) corresponding to the video signals.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: April 25, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Kenji Nakao
  • Patent number: 6914644
    Abstract: In a liquid crystal panel in which pseudo dot inversion driving is performed, the occurrence of flicker or vertical and horizontal strings is prevented by preventing an alignment shift between individual layers during the fabrication of a TFT array from producing a difference between the respective abilities of thin-film TFTs to charge adjacent pixels (61, 62). For this purpose, the liquid crystal display panel is constructed such that two TFTs which are enclosed by two adjacent image signal lines (21, 22) and scan signal lines (3) and adjacent to each other along the signal lines (21, 22) have respective source electrodes (71, 72) adjacent to the different image signal lines (21, 22). The source electrodes (71, 72) and drain electrodes (81, 82) of the two TFTs connected to the adjacent pixels (61, 62) are alternately arranged such that variations caused by the alignment shift in the sizes and areas of overlapping portions between the individual layers of the TFTs are equal or the same.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: July 5, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Masanori Kimura, Satoshi Asada, Yoneharu Takubo
  • Patent number: 6909415
    Abstract: The present invention provides a display apparatus that can reduce a voltage irregularity and a brightness irregularity accompanied by making an enlarged and a high resolution type display apparatus.
    Type: Grant
    Filed: April 23, 2001
    Date of Patent: June 21, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuhiko Kumagawa, Masanori Kimura, Tetsuo Fukami, Akio Takimoto, Yukio Tanaka, Kazunori Komori
  • Patent number: 6850303
    Abstract: The liquid crystal display device having an array substrate (10) provided with a pixel electrode (3) disposed in a region defined by two adjacent gate wirings (1) and two adjacent source wirings (2), a switching element (5) for switching a voltage applied to the pixel electrode (3) from the source wiring (2) based on a signal volume fed from the gate wiring (1), a common wiring (8) formed between the two adjacent gate wirings (1), a common electrode (4) being electrically connected to the common wiring (8) and generating an electric field between the common electrode (4) and the pixel electrode (3) for driving the liquid crystal, and a storage capacity electrode (20a) electrically connected to the common wiring (8), wherein the common wiring (8) and the storage capacity electrode (20a) are layered so as to hold at least some part of the pixel electrode (3) in between through insulating layers (6a, 6b).
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: February 1, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masanori Kimura, Katsuhiko Kumagawa, Tetsuo Fukami, Hiroyuki Yamakita, Satoshi Asada
  • Patent number: 6816208
    Abstract: This is an active matrix liquid crystal display device comprising a capacitive accumulation portion formed by overlapping a pixel electrode, an insulating layer and a common electrode for each pixel area, and a non-electrode area in a part of the pixel area which is not covered with a pixel electrode, wherein a peripheral shape of said capacitive accumulation portion on a side contacting said non-electrode area is substantially the same between the respective pixels, and a value of a storage capacity in said capacitive accumulation portion differs on a feeding side and on a termination side, the value on the feeding side being larger than the value on the termination side. Thereby, a constant aperture ratio can be maintained by changing the storage capacity value for each pixel.
    Type: Grant
    Filed: July 23, 2001
    Date of Patent: November 9, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Masanori Kimura
  • Patent number: 6801264
    Abstract: One of a pair of substrates with liquid crystals sandwiched therebetween includes a plurality of pixels each of which is provided with a scanning electrode, an image signal electrode, a switching element provided at an intersection of the scanning electrode and the image signal electrode, a pixel electrode connected to the image signal electrode via the switching element, a counter electrode, and a busbar electrically connected to the counter electrode. A portion of the pixel electrode is overlapped with the busbar so as to make up a storage capacitance. A shape of the pixel electrode is altered for each pixel so that a value of the storage capacitance becomes smaller from a feeding side to a termination side. The portion of the pixel electrode overlapped with the busbar so as to make up the storage capacitance is located within the busbar in a plan view of the device.
    Type: Grant
    Filed: February 9, 2004
    Date of Patent: October 5, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuhiko Kumagawa, Masanori Kimura, Tetsuo Fukami
  • Patent number: 6787829
    Abstract: A liquid crystal display panel of the invention is such that, in a pixel region defined by a region of the array substrate surrounded by a pair of image signal lines and a pair of scanning signal lines, of a line-shaped pixel electrode and a common electrode, the electrode that is disposed adjacent to and parallel to a signal line is made of an opaque conductor and at least one of the other electrodes is made of a transparent conductor. Adverse effects of the electric field formed between a signal line and an adjacent electrode thereto are suppressed and a sufficient aperture ratio is ensured by using a transparent conductor for the electrode contributing good display.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: September 7, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Hiroyuki Yamakita, Masanori Kimura, Michiko Okafuji, Satoshi Asada
  • Publication number: 20040160541
    Abstract: One of a pair of substrates with liquid crystals sandwiched therebetween includes a plurality of pixels each of which is provided with a scanning electrode, an image signal electrode, a switching element provided at an intersection of the scanning electrode and the image signal electrode, a pixel electrode connected to the image signal electrode via the switching element, a counter electrode, and a busbar electrically connected to the counter electrode. A portion of the pixel electrode is overlapped with the busbar so as to make up a storage capacitance. A shape of the pixel electrode is altered for each pixel so that a value of the storage capacitance becomes smaller from a feeding side to a termination side. The portion of the pixel electrode overlapped with the busbar so as to make up the storage capacitance is located within the busbar in a plan view of the device.
    Type: Application
    Filed: February 9, 2004
    Publication date: August 19, 2004
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuhiko Kumagawa, Masanori Kimura, Tetsuo Fukami
  • Patent number: 6717628
    Abstract: One of a pair of substrates with liquid crystals sandwiched therebetween includes a plurality of pixels each of which is provided with a scanning electrode, an image signal electrode, a switching element provided at an intersection of the scanning electrode and the image signal electrode, a pixel electrode connected to the image signal electrode via the switching element, a counter electrode, and a busbar electrically connected to the counter electrode. A portion of the pixel electrode is overlapped with the busbar so as to make up a storage capacitance. A shape of the pixel electrode is altered for each pixel so that a value of the storage capacitance becomes smaller from a feeding side to a termination side. The portion of the pixel electrode overlapped with the busbar so as to make up the storage capacitance is located within the busbar in a plan view of the device.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: April 6, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuhiko Kumagawa, Masanori Kimura, Tetsuo Fukami
  • Publication number: 20030117534
    Abstract: One of a pair of substrates with liquid crystals sandwiched therebetween includes a plurality of pixels each of which is provided with a scanning electrode, an image signal electrode, a switching element provided at an intersection of the scanning electrode and the image signal electrode, a pixel electrode connected to the image signal electrode via the switching element, a counter electrode, and a busbar electrically connected to the counter electrode. A portion of the pixel electrode is overlapped with the busbar so as to make up a storage capacitance. A shape of the pixel electrode is altered for each pixel so that a value of the storage capacitance becomes smaller from a feeding side to a termination side. The portion of the pixel electrode overlapped with the busbar so as to make up the storage capacitance is located within the busbar in a plan view of the device.
    Type: Application
    Filed: October 23, 2002
    Publication date: June 26, 2003
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuhiko Kumagawa, Masanori Kimura, Tetsuo Fukami
  • Publication number: 20030063074
    Abstract: The present invention provides a display apparatus that can reduce a voltage irregularity and a brightness irregularity accompanied by making an enlarged and a high resolution type display apparatus.
    Type: Application
    Filed: December 21, 2001
    Publication date: April 3, 2003
    Inventors: Katsuhiko Kumagawa, Masanori Kimura, Tetsuo Fukami, Akio Takimoto, Yukio Tamaka, Kazunori Komori
  • Publication number: 20030011555
    Abstract: A method of driving a liquid crystal display and the liquid crystal display of the present invention are such that in a liquid crystal display in which video signals are written onto a plurality of pixels frame by frame (Tf), voltages corresponding to the video signals are held in the pixels, and a modulation degree of the liquid crystal layer in an alignment state for display is controlled in accordance with the held voltages, thereby displaying an image, a backward-transition-prevention voltage &Dgr;V for preventing backward transition of a liquid crystal layer is temporalily superposed on the voltages (Vd1-Vdn) corresponding to the video signals in a hold period (Th) of the voltages (Vd1-Vdn) corresponding to the video signals.
    Type: Application
    Filed: August 22, 2002
    Publication date: January 16, 2003
    Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Kenji Nakao
  • Publication number: 20020176043
    Abstract: A liquid crystal display panel of the invention is such that, in a pixel region defined by a region of the array substrate surrounded by a pair of image signal lines and a pair of scanning signal lines, of a line-shaped pixel electrode and a common electrode, the electrode that is disposed adjacent to and parallel to a signal line is made of an opaque conductor and at least one of the other electrodes is made of a transparent conductor. Adverse effects of the electric field formed between a signal line and an adjacent electrode thereto are suppressed and a sufficient aperture ratio is ensured by using a transparent conductor for the electrode contributing good display.
    Type: Application
    Filed: December 5, 2001
    Publication date: November 28, 2002
    Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Hiroyuki Yamakita, Masanori Kimura, Michiko Okafuji, Satoshi Asada
  • Publication number: 20020171779
    Abstract: The liquid crystal display device having an array substrate (10) provided with a pixel electrode (3) disposed in a region defined by two adjacent gate wirings (1) and two adjacent source wirings (2), a switching element (5) for switching a voltage applied to the pixel electrode (3) from the source wiring (2) based on a signal volume fed from the gate wiring (1), a common wiring (8) formed between the two adjacent gate wirings (1), a common electrode (4) being electrically connected to the common wiring (8) and generating an electric field between the common electrode (4) and the pixel electrode (3) for driving the liquid crystal, and a storage capacity electrode (20a) electrically connected to the common wiring (8), wherein the common wiring (8) and the storage capacity electrode (20a) are layered so as to hold at least some part of the pixel electrode (3) in between through insulating layers (6a, 6b).
    Type: Application
    Filed: May 28, 2002
    Publication date: November 21, 2002
    Inventors: Masanori Kimura, Katsuhiko Kumagawa, Tetsuo Fukami, Hiroyuki Yamakita, Satoshi Asada
  • Publication number: 20020158997
    Abstract: In a liquid crystal panel in which pseudo dot inversion driving is performed, the occurrence of flicker or vertical and horizontal strings is prevented by preventing an alignment shift between individual layers during the fabrication of a TFT array from producing a difference between the respective abilities of thin-film TFTs to charge adjacent pixels (61, 62). For this purpose, the liquid crystal display panel is constructed such that two TFTs which are enclosed by two adjacent image signal lines (21, 22) and scan signal lines (3) and adjacent to each other along the signal lines (21, 22) have respective source electrodes (71, 72) adjacent to the different image signal lines (21, 22). The source electrodes (71, 72) and drain electrodes (81, 82) of the two TFTs connected to the adjacent pixels (61, 62) are alternately arranged such that variations caused by the alignment shift in the sizes and areas of overlapping portions between the individual layers of the TFTs are equal or the same.
    Type: Application
    Filed: August 24, 2001
    Publication date: October 31, 2002
    Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Masanori Kimura, Satoshi Asada, Yoneharu Takubo
  • Publication number: 20020012077
    Abstract: This is an active matrix liquid crystal display device comprising a capacitive accumulation portion formed by overlapping a pixel electrode, an insulating layer and a common electrode for each pixel area, and a non-electrode area in a part of the pixel area which is not covered with a pixel electrode, wherein a peripheral shape of said capacitive accumulation portion on a side contacting said non-electrode area is substantially the same between the respective pixels, and a value of a storage capacity in said capacitive accumulation portion differs on a feeding side and on a termination side, the value on the feeding side being larger than the value on the termination side. Thereby, a constant aperture ratio can be maintained by changing the storage capacity value for each pixel.
    Type: Application
    Filed: July 23, 2001
    Publication date: January 31, 2002
    Applicant: Matushita Electric Industrial Co., Ltd.
    Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Masanori Kimura