Patents by Inventor Akihiko Fujisawa

Akihiko Fujisawa 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: 20240134217
    Abstract: A method for inspecting a semiconductor device in which each of a plurality of reflective elements includes a liquid crystal. The method includes the steps of acquiring a first capacitance corresponding to each of the plurality of reflective elements after inputting a first voltage signal to the semiconductor device so that a dielectric constant of the liquid crystal is in a predetermined first state in each of the plurality of reflective elements, acquiring a second capacitance corresponding to each of the plurality of reflective elements after inputting a second voltage signal to the semiconductor device so that a dielectric constant of the liquid crystal is in a predetermined second state in each of the plurality of reflective elements, calculating a difference value between the first capacitance and the second capacitance, and determining whether the difference value is less than or equal to a predetermined threshold value.
    Type: Application
    Filed: October 18, 2023
    Publication date: April 25, 2024
    Inventors: Masayuki IKARI, Akihiko FUJISAWA
  • Publication number: 20240102917
    Abstract: According to an aspect, a detection device includes: photodiodes that are provided on a substrate; light-emitting elements that are arranged so as to face the photodiodes; and a light-transmitting placement substrate that is disposed between the photodiodes and the light-emitting elements and on which target objects are to be placed. The photodiodes, the placement substrate, and the light-emitting elements are arranged in the order as listed, in a direction orthogonal to the substrate. A light-emitting element of the light-emitting elements corresponding to the photodiode to be detected is controlled to be lit, and another light-emitting element of the light-emitting elements corresponding to the photodiode not to be detected is controlled to be unlit. The photodiodes to be detected output sensor values based on light from the lit-up light-emitting elements. The light-emitting elements adjacent to the lit-up light-emitting elements at least in row and column directions are controlled to be unlit.
    Type: Application
    Filed: September 25, 2023
    Publication date: March 28, 2024
    Inventors: Akihiko FUJISAWA, Kaoru ITO, Kazunori YAMAGUCHI
  • Patent number: 11934611
    Abstract: A detecting device includes a plurality of first electrodes arrayed in a first direction and a second direction intersecting the first direction in a detection region, an electrode drive circuit configured to supply a drive signal to the first electrodes, a detection circuit configured to detect a detection signal received from the first electrodes, and a coupling circuit configured to couple part of the first electrodes to the detection circuit as a detection electrode and couple the first electrodes disposed side by side with the detection electrode in at least the first direction and the second direction to the electrode drive circuit as a drive electrode in a first detection period.
    Type: Grant
    Filed: March 2, 2022
    Date of Patent: March 19, 2024
    Assignee: Japan Display Inc.
    Inventors: Akihiko Fujisawa, Naoki Takada, Kisho Yamamoto
  • Patent number: 11899880
    Abstract: A liquid crystal display device includes a liquid crystal layer provided between a first substrate and a second substrate, a detection electrode configured to detect an external proximity object, a plurality of pixels overlapping the detection electrode in plan view, and a detection circuit configured to detect a detected capacitance value generated in the detection electrode. A liquid crystal capacitance value generated between each of the pixels and the detection electrode includes a first capacitance value at a first gradation and a second capacitance value at a second gradation smaller than the first gradation, and the detection circuit corrects the detected capacitance value based on a ratio between number of pixels with the first gradation and number of pixels with the second gradation out of the pixels.
    Type: Grant
    Filed: November 18, 2022
    Date of Patent: February 13, 2024
    Assignee: Japan Display Inc.
    Inventors: Kaoru Ito, Akihiko Fujisawa
  • Patent number: 11899883
    Abstract: According to one embodiment, a display device includes a display area, a plurality of sensor electrodes and a shield electrode. The display panel includes a first substrate, a second substrate opposed to the first substrate, a liquid crystal layer sealed between the first substrate and the second substrate, a pixel electrode, and a counter-electrode. The plurality of sensor electrodes are arranged to surround the display area. The shield electrode is arranged between the plurality of sensor electrodes and the pixel electrode or the counter-electrode located closest to a boundary between the display area and a non-display area surrounding the display area, in planar view. A predetermined reference voltage is applied to the shield electrode.
    Type: Grant
    Filed: September 19, 2022
    Date of Patent: February 13, 2024
    Assignee: Japan Display Inc.
    Inventors: Akihiko Fujisawa, Kaoru Ito
  • Patent number: 11899877
    Abstract: According to one embodiment, a display device includes a display part, a plurality of sensor electrodes and a controller. The display part is configured to display an image. The plurality of sensor electrodes are arranged to surround the display part. The controller is electrically connected to the sensor electrodes, and is configured to detect an object close to or contacting the sensor electrodes. The controller drives at least one of the sensor electrodes as a detection electrode and drives at least one of the sensor electrodes as a drive electrode.
    Type: Grant
    Filed: April 6, 2022
    Date of Patent: February 13, 2024
    Assignee: Japan Display Inc.
    Inventor: Akihiko Fujisawa
  • Patent number: 11861932
    Abstract: A detection device includes a sensor area provided with a plurality of detection elements each comprising a photoelectric conversion element in a detection area, and a detector configured to detect a potential difference between a voltage generated in a first detection element and a voltage generated in a second detection element adjacent to the first detection element in the detection area.
    Type: Grant
    Filed: November 22, 2022
    Date of Patent: January 2, 2024
    Assignee: Japan Display Inc.
    Inventors: Takaaki Kono, Akihiko Fujisawa
  • Patent number: 11804066
    Abstract: A detection device includes a plurality of detection elements arranged in a matrix having a row-column configuration in a detection area of a substrate, and an initialization circuit configured to apply an initialization potential to each of the detection elements. The initialization circuit has a first mode to apply a same initialization potential to all the detection elements and a second mode to apply different initialization potentials to the detection elements adjacent to each other.
    Type: Grant
    Filed: October 19, 2022
    Date of Patent: October 31, 2023
    Assignee: Japan Display Inc.
    Inventors: Akihiko Fujisawa, Takaaki Kono
  • Publication number: 20230326236
    Abstract: A detection device includes a sensor circuit provided with a first photodiode in a semiconductor layer, and a signal detector configured to acquire a detection value corresponding to a signal output from the sensor circuit. The signal detector includes a first detection circuit coupled to one end of the first photodiode, a first switch circuit configured to apply a power supply potential to another end of the first photodiode, and a second switch circuit configured to short both ends of the first photodiode.
    Type: Application
    Filed: April 6, 2023
    Publication date: October 12, 2023
    Inventors: Akihiko FUJISAWA, Takaaki KONO
  • Patent number: 11774814
    Abstract: According to one embodiment, a display device includes a plurality of detection electrodes, a first shield electrode and a second shield electrode. The plurality of detection electrodes are disposed in a peripheral area surrounding a display area configured to display an image. The first shield electrode is disposed on a first substrate and in at least the peripheral area, the first shield electrode having a predetermined fixed potential. The second shield electrode is disposed on a second substrate and in at least the peripheral area, the second shield electrode having the predetermined fixed potential. The first shield electrode and the second shield electrode are disposed, in a plan view, on a side of the display area with respect to each of the detection electrodes.
    Type: Grant
    Filed: November 8, 2021
    Date of Patent: October 3, 2023
    Assignee: Japan Display Inc.
    Inventors: Kaoru Ito, Akihiko Fujisawa
  • Publication number: 20230305500
    Abstract: According to one embodiment, a display device includes a display area, a peripheral area and a plurality of detection electrodes. The display area includes a display element. The peripheral area surrounds the display area. The plurality of detection electrodes are arranged in the peripheral area. The plurality of detection electrodes are each electrically connected to at least one other detection electrode that is not adjacent thereto.
    Type: Application
    Filed: March 21, 2023
    Publication date: September 28, 2023
    Inventors: Kaoru ITO, Akihiko FUJISAWA, Daichi ABE
  • Patent number: 11762496
    Abstract: A technology which can improve the accuracy of touch detection is proposed. A display device includes: a touch panel including plural drive electrodes and plural detection electrodes; plural peripheral wirings; and plural switching elements each of which is disposed between a detection electrode and the corresponding peripheral wiring and that is connected to the detection electrode and the corresponding peripheral electrode. The touch panel executes detection by means of a mutual detection scheme using the plural drive electrodes and the plural detection electrodes. In a condition in which a predefined voltage is applied to the peripheral wirings when the plural switching elements are in an off-state, the voltages of the drive electrodes are changed, and subsequently a condition in which the changes of the voltages of the drive electrodes can be detected from the peripheral wirings is set, and the switching elements are turned from off to on.
    Type: Grant
    Filed: February 17, 2022
    Date of Patent: September 19, 2023
    Assignee: Japan Display Inc.
    Inventors: Akihiko Fujisawa, Daichi Abe, Kaoru Ito
  • Publication number: 20230289002
    Abstract: According to one embodiment, a display device includes a display area for displaying an image, a plurality of detection electrodes and a movable electrode. The plurality of detection electrodes are disposed in a peripheral area surrounding the display area. The movable electrode is disposed in such a way as to surround the detection electrodes and is movable around the detection electrodes. The movable electrode has a length corresponding to a length of each of the detection electrodes in a peripheral direction.
    Type: Application
    Filed: March 9, 2023
    Publication date: September 14, 2023
    Inventors: Daichi ABE, Akihiko FUJISAWA
  • Patent number: 11740753
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate, a sealant, a first electrode, an insulating film and a second electrode. The sealant bonds the first substrate and the second substrate and is provided in a peripheral area surrounding a display area. The first electrode is provided on the first substrate in the peripheral area. The insulating film covers the first electrode. The second electrode is provided on the second substrate in the peripheral area. The sealant contains a conductive member. At least one of the first electrode and the second electrode includes a plurality of fine line portions in an area where the first electrode, the insulating film, the sealant, and the second electrode are overlapped in planar view.
    Type: Grant
    Filed: January 20, 2022
    Date of Patent: August 29, 2023
    Assignee: Japan Display Inc.
    Inventors: Kaoru Ito, Akihiko Fujisawa
  • Publication number: 20230205345
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate, a display area, at least one first sensor electrode, a second sensor electrode and a detection circuit. The second substrate is opposed to the first substrate. The display area displays an image. The first sensor electrode is disposed in a peripheral area surrounding the display area. The second sensor electrode is disposed at a position overlapping the first sensor electrode in planar view. The detection circuit is electrically connected to the first sensor electrode. The second sensor electrode is set to a state of being electrically connected to nothing or a state of being biased by resistance of 50 k? or greater. The second sensor electrode is larger in area than the first sensor electrode.
    Type: Application
    Filed: March 7, 2023
    Publication date: June 29, 2023
    Inventors: Akihiko FUJISAWA, Kaoru ITO, Daichi ABE
  • Patent number: 11687207
    Abstract: A display device is provided and includes display panel; sensor substrate formed on display panel; and M drive electrodes and detection electrodes extended in direction so as to intersect with M drive electrodes, wherein among M drive electrodes, any of lengths of N first drive electrodes, which are continuously adjacent to one another, is shorter than any of lengths of other N second drive electrodes which are continuously adjacent to one another, and number of detection electrodes which intersect with N first drive electrodes is larger than number of detection electrodes which intersect with N second drive electrodes.
    Type: Grant
    Filed: February 15, 2022
    Date of Patent: June 27, 2023
    Assignee: Japan Display Inc.
    Inventors: Akihiko Fujisawa, Teppei Yamada, Kaoru Ito
  • Publication number: 20230198522
    Abstract: According to one embodiment, a display device includes a display area, a first sensor electrode, a second sensor electrode and a detector. The display area displays an image. The first sensor electrode is disposed in a peripheral area surrounding the display area. The second sensor electrode is disposed in the peripheral area and disposed adjacent to the first sensor electrode. The detector is electrically connected to the first sensor electrode and the second sensor electrode. The first sensor electrode and the second sensor electrode both have a body portion and a comb tooth portion having a plurality of linear electrodes. A comb tooth portion of the first sensor electrode and a comb tooth portion of the second sensor electrode are disposed at mutually different locations.
    Type: Application
    Filed: February 21, 2023
    Publication date: June 22, 2023
    Inventors: Akihiko Fujisawa,, Kaoru Ito, Daichi Abe
  • Publication number: 20230169788
    Abstract: A detection device includes a sensor area provided with a plurality of detection elements each comprising a photoelectric conversion element in a detection area, and a detector configured to detect a potential difference between a voltage generated in a first detection element and a voltage generated in a second detection element adjacent to the first detection element in the detection area.
    Type: Application
    Filed: November 22, 2022
    Publication date: June 1, 2023
    Inventors: Takaaki KONO, Akihiko FUJISAWA
  • Patent number: 11656724
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate opposing the first substrate, a liquid crystal layer, at least one first detection electrode disposed in a display area and a plurality of second detection electrodes disposed in a peripheral area. In a display period in which images are displayed on the display area, a predetermined voltage is applied to the first detection electrode to drive the liquid crystal layer, and in a period in which the liquid crystal layer is not driven, the first detection electrode is set to a state of being not electrically connected to anywhere or being connected to a predetermined potential with an impedance of 50 k? or higher.
    Type: Grant
    Filed: August 19, 2021
    Date of Patent: May 23, 2023
    Assignee: Japan Display Inc.
    Inventors: Akihiko Fujisawa, Kaoru Ito, Daichi Abe
  • Publication number: 20230130956
    Abstract: A detection device includes a plurality of detection elements arranged in a matrix having a row-column configuration in a detection area of a substrate, and an initialization circuit configured to apply an initialization potential to each of the detection elements. The initialization circuit has a first mode to apply a same initialization potential to all the detection elements and a second mode to apply different initialization potentials to the detection elements adjacent to each other.
    Type: Application
    Filed: October 19, 2022
    Publication date: April 27, 2023
    Inventors: Akihiko FUJISAWA, Takaaki KONO