Patents by Inventor Takuo Kaitoh

Takuo Kaitoh 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: 20220223707
    Abstract: The purpose of the present invention is to suppress a change in characteristics of a TFT using an oxide semiconductor film caused by that oxygen in the oxide semiconductor film is extracted by metal electrode. The main structure of the present invention is as follows. A semiconductor device having a TFT, in which a gate insulating film is formed on a gate electrode, and an oxide semiconductor film is formed on the gate insulating film; the oxide semiconductor film including a channel region, a drain region, and a source region; in which a metal nitride film is formed on a top surface of the gate electrode in an opposing portion to the channel region in a plan view; and the metal nitride film is not formed at a part of the top surface of the gate electrode.
    Type: Application
    Filed: March 30, 2022
    Publication date: July 14, 2022
    Applicant: Japan Display Inc.
    Inventors: Akihiro Hanada, Takuo Kaitoh, Hajime Watakabe
  • Publication number: 20220223782
    Abstract: The purpose of the present invention is to form a semiconductor device in which an active area laminated on a PZT (lead zirconate titanate (PbZrTiO3) sensor having a piezoelectric effect. The main structure of the present invention is as follows. A semiconductor device having a PZT (lead zirconate titanate (PbZrTiO3)) sensor including: the PZT sensor including a lower electrode formed on a glass substrate, a PZT, an upper electrode, a first inorganic insulating film covering the upper electrode, and an upper wiring formed on the first inorganic insulating film and connected to the upper electrode through a first through-hole formed in the first inorganic insulating film; in which a polyimide film is formed over the PZT sensor; a plurality of TFTs are formed on the polyimide film, and a thickness of the polyimide film is 5 ?m or more.
    Type: Application
    Filed: March 30, 2022
    Publication date: July 14, 2022
    Applicant: Japan Display Inc.
    Inventors: Toshihiko ITOGA, Takuo KAITOH
  • Publication number: 20220209014
    Abstract: According to one embodiment, a semiconductor device includes a first insulating film formed of silicon nitride, a second insulating film disposed above the first insulating film and formed of silicon oxide, including a first region and a peripheral region surrounding the first region and thinner than the first region, an oxide semiconductor disposed on the second insulating film and intersecting the first region, a source electrode overlapping the peripheral region and a drain electrode overlapping the peripheral region. The first region is located between the source electrode and the drain electrode and separated from the source electrode and the drain electrode.
    Type: Application
    Filed: December 27, 2021
    Publication date: June 30, 2022
    Applicant: Japan Display Inc.
    Inventors: Takuo KAITOH, Akihiro HANADA, Takashi OKADA
  • Publication number: 20220173247
    Abstract: A semiconductor device includes a thin-film transistor. The thin-film transistor comprises an oxide semiconductor layer, a gate insulating layer, a gate electrode overlapped on the oxide semiconductor layer through the gate insulating layer, a source electrode in contact with the oxide semiconductor layer, a drain electrode in contact with the oxide semiconductor layer and a first metal layer in contact with the oxide semiconductor layer and disposed between the source electrode and the drain electrode at a distance from the source electrode and the drain electrode.
    Type: Application
    Filed: November 9, 2021
    Publication date: June 2, 2022
    Applicant: Japan Display Inc.
    Inventors: Akihiro HANADA, Hajime WATAKABE, Takuo KAITOH, Ryo ONODERA
  • Publication number: 20220173248
    Abstract: A semiconductor device includes a thin-film transistor. The thin-film transistor comprises an oxide semiconductor layer, a gate insulating layer, a gate electrode overlapped on the oxide semiconductor layer through the gate insulating layer, a source electrode in contact with the oxide semiconductor layer, a drain electrode in contact with the oxide semiconductor layer and n (n is a natural number) metal layer(s) in contact with the oxide semiconductor layer and disposed across the oxide semiconductor layer between the source electrode and the drain electrode. The oxide semiconductor layer has (n+1) channel regions between the source electrode and the drain electrode in a plan view.
    Type: Application
    Filed: November 10, 2021
    Publication date: June 2, 2022
    Applicant: Japan Display Inc.
    Inventors: Akihiro HANADA, Takuo KAITOH
  • Publication number: 20220163858
    Abstract: According to one embodiment, an electronic device includes a liquid crystal panel and a camera. The liquid crystal panel includes a display area and an incident light control area. The display area includes a pixel electrode. The camera overlaps the incident light control area. The incident light control area includes an annular line, and a control electrode formed inside the annular line to be connected to the annular line. A time to apply a voltage to the control electrode is shorter than a time to apply a voltage to the pixel electrode.
    Type: Application
    Filed: February 8, 2022
    Publication date: May 26, 2022
    Applicant: Japan Display Inc.
    Inventors: Kazuhiro NISHIYAMA, Akio TAKIMOTO, Toshiki KANEKO, Takuo KAITOH, Hiroyuki Kimura
  • Publication number: 20220149203
    Abstract: The purpose of the present invention is to suppress a variation in a threshold voltage (? Vth) in a Thin Film Transistor (TFT) using an oxide semiconductor. The present invention takes a structure as follows to attain this purpose. A semiconductor device having TFT using an oxide semiconductor including: a channel region, a source region, a drain region, and a transition region between the channel region and the source region and between the channel region and the drain region, in which a resistivity of the transition region is smaller than that of the channel region, and larger than that of the source region or the drain region; a source electrode is formed overlapping the source region, and a drain electrode is formed overlapping the drain region; and a thickness of the transition region of the oxide semiconductor is larger than a thickness of the channel region of the oxide semiconductor.
    Type: Application
    Filed: January 20, 2022
    Publication date: May 12, 2022
    Applicant: Japan Display Inc.
    Inventors: Akihiro HANADA, Takuo KAITOH, Masashi TSUBUKU
  • Publication number: 20220140117
    Abstract: According to one embodiment, a method for manufacturing a semiconductor device, includes forming a first insulating film which covers a gate electrode, forming an island-shaped oxide semiconductor in contact with the first insulating film, forming a second insulating film which covers the oxide semiconductor, forming a source electrode in contact with the oxide semiconductor, forming a drain electrode in contact with the oxide semiconductor, forming a third insulating film which covers the source electrode and the drain electrode and forming a channel region between the source electrode and the drain electrode by supplying oxygen from the third insulating film to the oxide semiconductor via the second insulating film.
    Type: Application
    Filed: October 27, 2021
    Publication date: May 5, 2022
    Applicant: Japan Display Inc.
    Inventors: Akihiro HANADA, Takuo KAITOH, Ryo ONODERA, Takashi OKADA, Tomoyuki ITO, Toshiki KANEKO
  • Publication number: 20220082883
    Abstract: According to one embodiment, an electronic equipment includes a liquid crystal panel including a display portion, a polarizer superposed on the display portion, and a detection element superposed on the liquid crystal panel and the polarizer to detect infrared rays through the liquid crystal panel and the polarizer.
    Type: Application
    Filed: November 23, 2021
    Publication date: March 17, 2022
    Applicant: Japan Display Inc.
    Inventors: Akio TAKIMOTO, Toshiki KANEKO, Takuo KAITOH, Kazuhiro NISHIYAMA, Hiroyuki KIMURA
  • Patent number: 11215862
    Abstract: According to one embodiment, an electronic equipment includes a liquid crystal panel including a display portion, a polarizer superposed on the display portion, and a detection element superposed on the liquid crystal panel and the polarizer to detect infrared rays through the liquid crystal panel and the polarizer.
    Type: Grant
    Filed: January 20, 2021
    Date of Patent: January 4, 2022
    Assignee: Japan Display Inc.
    Inventors: Akio Takimoto, Toshiki Kaneko, Takuo Kaitoh, Kazuhiro Nishiyama, Hiroyuki Kimura
  • Publication number: 20210141252
    Abstract: According to one embodiment, an electronic apparatus includes a camera, a first polarizer, a second polarizer, a liquid crystal panel, and a controller controlling the liquid crystal panel. The liquid crystal panel includes a first region and a second region. The controller controls a first opening mode of transmitting light through the first region and the second region, and a second opening mode of making a quantity of light transmitted through the first region smaller than a quantity of light transmitted through the second region.
    Type: Application
    Filed: December 18, 2020
    Publication date: May 13, 2021
    Applicant: Japan Display Inc.
    Inventors: Akio TAKIMOTO, Toshiki KANEKO, Takuo KAITOH, Kazuhiro NISHIYAMA, Hiroyuki KIMURA
  • Publication number: 20210141266
    Abstract: According to one embodiment, an electronic equipment includes a liquid crystal panel including a display portion, a polarizer superposed on the display portion, and a detection element superposed on the liquid crystal panel and the polarizer to detect infrared rays through the liquid crystal panel and the polarizer.
    Type: Application
    Filed: January 20, 2021
    Publication date: May 13, 2021
    Applicant: Japan Display Inc.
    Inventors: Akio TAKIMOTO, Toshiki KANEKO, Takuo KAITOH, Kazuhiro NISHIYAMA, Hiroyuki KIMURA
  • Publication number: 20210088842
    Abstract: According to one embodiment, an electronic apparatus includes a camera, a liquid crystal panel including a display portion overlaid on the camera, a light guide having a first side surface and a main surface opposed to the liquid crystal panel and a first through hole, and a light source opposed to the first side surface. The camera is provided in the first through hole.
    Type: Application
    Filed: December 3, 2020
    Publication date: March 25, 2021
    Applicant: Japan Display Inc.
    Inventors: Akio TAKIMOTO, Toshiki KANEKO, Takuo KAITOH, Kazuhiro NISHIYAMA, Hiroyuki KIMURA
  • Patent number: 9372376
    Abstract: A method of manufacturing a liquid crystal display device having a substrate with a display area, a control area adjacent to the display area, and terminals. The method includes forming an interlayer insulating film and an a-Si film below an image signal line in the display area and below a line in the same layer as the image signal line in the control area, forming a scribing line outside the terminals, forming a ground line in the same layer as the scan line outside the scribing line, forming the interlayer insulating film outside the terminal, without forming the a-Si film on the interlayer insulating film, forming a static electricity protection line coupled to the terminal on the interlayer insulating film, the static electricity protection line being coupled to other static electricity protection lines outside the ground line, and, after the steps above, separating the substrate along the scribing line.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: June 21, 2016
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co. LTD
    Inventors: Terunori Saitou, Hidekazu Miyake, Takuo Kaitoh, Yoshiharu Owaku
  • Patent number: 9128286
    Abstract: A metal layer is formed on a highly light-transmissive substrate; a resist mask having an opening pattern is formed on the metal layer; exposed portions of the metal layer is etched away in this state to form openings; then the resist mask is removed; and a surface of the metal layer and an inner side wall of each of the openings are oxidized to form a metal oxide layer. Thus, a front surface and a rear surface of the aperture plate are caused to have different reflectances. The oxide layer is formed at the same time as when the resist mask is ashed to remove resist.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: September 8, 2015
    Assignee: Pixtronix, Inc.
    Inventors: Kouhei Takahashi, Takeshi Kuriyagawa, Daisuke Sonoda, Takuo Kaitoh, Katsumi Matsumoto
  • Patent number: 8970940
    Abstract: The MEMS shutter includes a shutter having an aperture part, a first spring connected to the shutter, a first anchor connected to the first spring, a second spring and a second anchor connected to the second spring, an insulation film on a surface of the shutter, the first spring, the second spring, the first anchor and the second anchor, the surfaces being in a perpendicular direction to a surface of a substrate, and the insulation film is not present on a surface of the plurality of terminals, and a surface of the shutter, the first spring, the second spring, the first anchor and the second anchor, the surfaces being in a parallel direction to a surface of the substrate and on the opposite side of the side facing the substrate.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: March 3, 2015
    Assignee: Pixtronix, Inc.
    Inventors: Takuo Kaitoh, Takeshi Kuriyagawa, Ryou Sakata, Osamu Karikome, Timothy J. Brosnihan
  • Patent number: 8958138
    Abstract: In a movable shutter-system display device, a movable shutter includes an amorphous silicon film material which has a low residual stress and thus is stable. A display device includes a display panel comprising a first substrate and a second substrate. The display panel includes a plurality of pixels; each of the plurality of pixels includes a movable shutter including amorphous silicon and a driving circuit for driving the movable shutter; and the amorphous silicon included in the movable shutter is formed of at least two amorphous silicon films, and where any two amorphous silicon films adjacent to each other among the at least two amorphous silicon films are a first amorphous silicon film and a second amorphous silicon film stacked on the first amorphous silicon film, the first amorphous silicon film and the second amorphous silicon film have different characteristic values.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: February 17, 2015
    Assignee: Pixtronix, Inc.
    Inventors: Hidekazu Nitta, Makoto Ohkura, Takuo Kaitoh, Katsumi Matsumoto
  • Patent number: 8717510
    Abstract: A liquid crystal display device intended for increasing the ON-current of a TFT in the pixel while suppressing variation of the ON-current, in which a semiconductor layer and a first n+-a-Si layer in the TFT are formed continuously by plasma CVD. The semiconductor layer and the first n+-a-Si layer are patterned simultaneously. Then, a second n+-a-Si layer is formed so as to cover the upper surface of the first n+-a-Si layer and the side portion of the semiconductor layer. The ON-current can be increased and variation of the ON-current of the TFT can be decreased by forming the first n+-a-Si layer continuously over the semiconductor layer.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: May 6, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hidekazu Nitta, Hidekazu Miyake, Takuo Kaitoh
  • Publication number: 20140106640
    Abstract: A method of manufacturing a liquid crystal display device having a substrate with a display area, a control area adjacent to the display area, and terminals. The method includes forming an interlayer insulating film and an a-Si film below an image signal line in the display area and below a line in the same layer as the image signal line in the control area, forming a scribing line outside the terminals, forming a ground line in the same layer as the scan line outside the scribing line, forming the interlayer insulating film outside the terminal, without forming the a-Si film on the interlayer insulating film, forming a static electricity protection line coupled to the terminal on the interlayer insulating film, the static electricity protection line being coupled to other static electricity protection lines outside the ground line, and, after the steps above, separating the substrate along the scribing line.
    Type: Application
    Filed: December 13, 2013
    Publication date: April 17, 2014
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Japan Display Inc.
    Inventors: Terunori SAITOU, Hidekazu MIYAKE, Takuo KAITOH, Yoshiharu OWAKU
  • Patent number: 8670082
    Abstract: A thin film transistor, a display device and a liquid crystal display device are provided. The thin film transistor includes a gate electrode film onto which light from a light source is irradiated, a semiconductor film formed on the gate electrode film and on an opposite side to the light source side through an insulating film, first and second electrode films formed to be in electrical contact with the semiconductor film, and a first shielding film formed in a same layer as the gate electrode film and electrically isolated from the gate electrode film, wherein the first shielding film overlaps a part of the semiconductor film as seen from the light irradiation direction and also overlaps at least a part of the first electrode film as seen from the light irradiation direction.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: March 11, 2014
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takeshi Noda, Takuo Kaitoh, Hidekazu Miyake, Takeshi Sakai