Patents by Inventor Akira Sakai

Akira Sakai 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: 10394079
    Abstract: A liquid crystal display panel (100) according to an embodiment includes: a first polarizer (22) and a first phase plate (32) on the viewer's side; and a second polarizer (24) and a second phase plate (34) on the rear face side. A liquid crystal layer, which takes a homogeneous alignment in the absence of an applied electric field, has a ?nd of not less than 360 nm and not more than 490 nm; a retardation R1 of the first phase plate is not less than 100 nm and not more than 160 nm; and a retardation R2 of the second phase plate is not less than 200 nm and not more than 360 nm. The slow axes of the first and second phase plates are substantially parallel to each other and substantially orthogonal to the azimuth direction of the director of the liquid crystal.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: August 27, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Kohzoh Nakamura, Kiyoshi Minoura, Akira Sakai
  • Publication number: 20190227378
    Abstract: The present invention provides a display device that can display chromatic color(s) and pattern(s) without power consumption in the non-display state (light off state) and an electronic apparatus including the display device. The display device includes a display panel and a transflective reflector disposed on a viewing surface side of the display panel. The transflective reflector includes a reflective polarizer and a color polarizer disposed on a side closer to the viewing surface than the reflective polarizer.
    Type: Application
    Filed: June 29, 2017
    Publication date: July 25, 2019
    Inventors: HISASHI WATANABE, AKIRA SAKAI, HIROYUKI HAKOI, MASAKI TABATA
  • Publication number: 20190219871
    Abstract: The liquid crystal display panel includes: a first polarizing plate; a first ?/4 plate; a first substrate; a second ?/4 plate; a liquid crystal layer; a second substrate; and a second polarizing plate, wherein the first substrate includes a black matrix but no photo spacer, the second substrate includes a photo spacer overlapping with the black matrix, liquid crystal molecules in the liquid crystal layer homogeneously align with no voltage application, the second ?/4 plate covers no side surface of the photo spacer, and the in-plane slow axis of the first ?/4 plate forms an angle of 45° with the transmission axis of the first polarizing plate and is orthogonal to the in-plane slow axis of the second ?/4 plate.
    Type: Application
    Filed: May 16, 2017
    Publication date: July 18, 2019
    Inventors: YUICHI KAWAHIRA, AKIRA SAKAI, KOZO NAKAMURA, MASAHIRO HASEGAWA, TAKAKO KOIDE, KOJI MURATA, KIYOSHI MINOURA
  • Publication number: 20190173384
    Abstract: The converter device includes a rectification circuit that receives, as an input, AC power from an AC power supply, and performs full-wave rectification on the AC power received, a booster circuit that boosts an output voltage from the rectification circuit, a smoothing capacitor that smooths an output voltage from the booster circuit, and outputs a voltage smoothed, to the load, and a controller that controls the booster circuit. The booster circuit includes a plurality of booster sections each of which includes a reactor, a switching element, and a reverse-blocking diode. The controller maintains, in an ON state, the switching element included in at least one of the plurality of booster sections for a predetermined time period to determine the presence or absence of a fault of the booster section.
    Type: Application
    Filed: February 24, 2016
    Publication date: June 6, 2019
    Inventors: Tomohiro KUTSUKI, Akira SAKAI, Daisuke SUZUKI, Satoru ICHIKI, Akito TANAKA
  • Publication number: 20190171052
    Abstract: A liquid crystal display panel of the present invention includes, sequentially from the viewer side: a first linearly polarizing plate; a first ?/4-wavelength layer; a first substrate including a color filter, a black matrix, and a second ?/4-wavelength layer; a liquid crystal layer; a second substrate; and a second linearly polarizing plate, the liquid crystal display panel further including a sealing material disposed so as to surround the liquid crystal layer in a plan view, wherein the second ?/4-wavelength layer is disposed closer to the liquid crystal layer than the color filter and the black matrix are and such that an outer edge of the second ?/4-wavelength layer lies inside an arrangement region of the sealing material, and the first ?/4-wavelength layer and the second ?/4-wavelength layer are disposed such that their slow axes are perpendicular to each other.
    Type: Application
    Filed: July 28, 2017
    Publication date: June 6, 2019
    Inventors: MASAHIRO HASEGAWA, KOJI MURATA, YUICHI KAWAHIRA, TAKAKO KOIDE, KOZO NAKAMURA, AKIRA SAKAI, KIYOSHI MINOURA
  • Publication number: 20190163004
    Abstract: The liquid crystal display panel includes in the following order from a viewing surface side to a back surface side: a first polarizer; a first ?/4 retardation layer; a first substrate; a second ?/4 retardation layer; a liquid crystal layer; a second substrate; and a second polarizer, the liquid crystal display panel being in a transverse electric field mode, the first substrate including a color filter layer in a display region, the second ?/4 retardation layer being a single layer covering the color filter layer and including a first retardation portion in an end region of the display region and a second retardation portion in a central region of the display region, the first retardation portion having a greater thickness than the second retardation portion, and the first retardation portion and the second retardation portion differing from each other in in-plane retardation by 10 nm or less.
    Type: Application
    Filed: November 28, 2018
    Publication date: May 30, 2019
    Inventors: YUICHI KAWAHIRA, KIYOSHI MINOURA, AKIRA SAKAI, TAKAKO KOIDE, MASAHIRO HASEGAWA, KOJI MURATA
  • Publication number: 20190155082
    Abstract: The liquid crystal display panel includes: a first polarizing plate; a first retardation provision portion including a first ?/4 plate; a first substrate; a second retardation provision portion including a second ?/4 plate; a liquid crystal layer containing nematic liquid crystal; a second substrate; and a second polarizing plate. One of the first substrate and the second substrate includes a pair of electrodes configured to generate a horizontal electric field at the liquid crystal layer upon voltage application. The nematic liquid crystal homogeneously aligns with no voltage application between the electrodes. One of the first retardation provision portion and the second retardation provision portion includes, on the first substrate side, a first retarder. The in-plane slow axis of the first ?/4 plate forms an angle of 45° with the absorption axis of the first polarizing plate and is orthogonal to the in-plane slow axis of the second ?/4 plate.
    Type: Application
    Filed: April 7, 2017
    Publication date: May 23, 2019
    Inventors: AKIRA SAKAI, MASAHIRO HASEGAWA, TAKAKO KOIDE, KOZO NAKAMURA, KIYOSHI MINOURA, YUICHI KAWAHIRA, KOJI MURATA
  • Publication number: 20190155107
    Abstract: The present invention provides a liquid crystal display device having excellent visibility outdoors, and a method for producing a liquid crystal display device capable of producing such a liquid crystal display device. The liquid crystal display device includes: a pair of substrates; a liquid crystal layer that is sandwiched between the pair of substrates and contains a liquid crystal material; and an alignment control layer that is in contact with the liquid crystal layer, at least one of the pair of substrates including a retardation layer on its liquid crystal layer side, the alignment control layer aligning the liquid crystal material in a direction horizontal to faces of the substrates, and containing a polymer containing at least a unit derived from a specific first monomer.
    Type: Application
    Filed: July 3, 2017
    Publication date: May 23, 2019
    Inventors: MASANOBU MIZUSAKI, HIROSHI TSUCHIYA, KIYOSHI MINOURA, AKIRA SAKAI
  • Patent number: 10269305
    Abstract: The present invention provides a mirror display that has improved design aesthetics and makes it possible to sufficiently improve visibility in mirror mode in dark environments. The mirror display according to the present invention includes a half mirror plate having a half mirror layer, a display device, a case, and an auxiliary illumination unit that includes an auxiliary light source. The case supports at least the half mirror plate and the display device and includes an outer frame that covers an edge of a front surface of the half mirror plate when viewed in a plan view from a viewing side. The display device is arranged on a rear side of the half mirror plate. The auxiliary light source is arranged on the rear side of the half mirror plate, the display device, or the outer frame. The auxiliary illumination unit is controlled separately from the display device and emits light towards the viewing side when the mirror display is in mirror mode.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: April 23, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Masahiro Hasegawa, Hiroyuki Hakoi, Akira Sakai, Hidefumi Yoshida, Takaharu Kanai, Takako Shimizu, Yuuki Itou, Atsushi Ogawa, Akira Tsuruta, Takayuki Yuasa, Shigeaki Mizushima
  • Publication number: 20190113790
    Abstract: The switching mirror panel of the present invention includes, in the following order: a reflective polarizing plate; a liquid crystal panel including a pair of substrates facing each other and a liquid crystal layer disposed between the substrates; and an absorptive polarizing plate, at least one of the substrates including divided pixel regions, the pixel regions each including, in the following order from the liquid crystal layer side, a pixel electrode, a transparent insulating film, and transparent conductive lines superimposed on the pixel electrode, the pixel electrode being electrically connected to at least one of the transparent conductive lines through an aperture formed in the transparent insulating film, the switching mirror panel being configured to switch between a transparent mode and a mirror mode by applying voltage to the pixel electrode to control the alignment of liquid crystal molecules in the liquid crystal layer.
    Type: Application
    Filed: March 27, 2017
    Publication date: April 18, 2019
    Inventors: HIROYUKI HAKOI, AKIRA SAKAI, KIYOSHI MINOURA
  • Patent number: 10254455
    Abstract: The present invention provides a mirror display that enables simultaneous perception of a mirror image and an image with suppressed uncomfortable feeling. The mirror display of the present invention includes a half mirror plate including a half mirror layer, and a display device. The display device is disposed on the back surface side of the half mirror plate. The distance between a display surface of the display device and a display surface of the half mirror plate is not smaller than 100 mm. The half mirror layer preferably includes a reflective polarizer.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: April 9, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Akira Sakai, Masahiro Hasegawa, Hiroyuki Hakoi, Kiyoshi Minoura
  • Publication number: 20190094593
    Abstract: Provided is a liquid crystal module being excellent in durability and manufacturing cost and exhibiting reduced variations in peak luminance that are caused depending on an azimuth angle during black display when the polar angle is large. The liquid crystal module includes: a liquid crystal panel including a first polarizer, a first substrate, a liquid crystal layer, an in-cell retardation layer (?/4 plate of nx>ny=nz), a second substrate, an out-cell retardation layer (?/4 plate of nx>ny?nz), and a second polarizer, from a back side toward an observation side; and a backlight. The backlight includes a first prism sheet including a first ridge line, and a second prism sheet provided on a back side from the first prism sheet and including a second ridge line orthogonal to the first ridge line. The first ridge line is parallel to an azimuth at which the liquid crystal panel has a maximized transmittance in an oblique direction during black display.
    Type: Application
    Filed: September 28, 2018
    Publication date: March 28, 2019
    Inventors: MASAHIRO HASEGAWA, KOJI MURATA, YUICHI KAWAHIRA, TAKAKO KOIDE, AKIRA SAKAI, KIYOSHI MINOURA
  • Publication number: 20190084541
    Abstract: The reservoir tank includes a reservoir body which reserves a fluid in an inner portion thereof formed to be in a hollow box shape. The reservoir body includes a port extending outward, a reservoir chamber which reserves the fluid and a port chamber which volume is smaller than that of the reservoir chamber and is in fluid communication with the port and a first communication passage positioned at a portion lower than a changeable liquid surface of the fluid reserved in the reservoir chamber in a vertical direction and provided at the first partition portion to allow the fluid communication between the reservoir chamber and the port chamber and wherein the port chamber and the port are kept being a state in which they are filled with the fluid supplied from the reservoir chamber via the first communication passage.
    Type: Application
    Filed: September 19, 2018
    Publication date: March 21, 2019
    Applicants: ADVICS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Sekine, Ryosuke Sakakibara, Jun Matsushima, Akira Omizu, Koji Masuda, Akira Sakai, Hideki Sugawa
  • Patent number: 10234727
    Abstract: The present invention provides a mirror display that can be enlarged without quality deterioration. The mirror display includes, in the order from a viewing surface side, a half mirror plate including a reflective polarizer, a polarization conversion layer, and a display device including an absorptive polarizer on a side of the polarization conversion layer. The reflective polarizer includes a transmission axis parallel to the longitudinal direction of the display device and is jointless. The absorptive polarizer includes a transmission axis perpendicular to the longitudinal direction of the display device and is jointless. The polarization conversion layer is configured to convert the polarization of polarized light passed through the absorptive polarizer.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: March 19, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Akira Sakai, Hiroyuki Hakoi, Masahiro Hasegawa, Kiyoshi Minoura
  • Patent number: 10180594
    Abstract: The present invention provides a mirror display that can suppress warp of a half mirror plate with a reflective polarizer under heat to prevent distortion of a reflected image in a mirror mode. The mirror display of the present invention includes a half mirror plate that includes a first reflective polarizer and a first base material, a display device, and a warp-suppressing member that suppresses shrinking of the first reflective polarizer under heat. The first reflective polarizer and the first base material are integrated, and the display device is disposed on the back surface side of the half mirror plate.
    Type: Grant
    Filed: April 21, 2015
    Date of Patent: January 15, 2019
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiroyuki Hakoi, Masahiro Hasegawa, Akira Sakai, Kiyoshi Minoura
  • Patent number: 10175519
    Abstract: One aspect of the present invention provides a touch panel-equipped mirror display that can reduce distortion and ghosting in mirror images while also reducing the rainbow effect in displayed images. The touch panel-equipped mirror display according to one aspect of the present invention includes, in order from a rear side: a display device that includes a polarizer; a touch panel; and a mirror plate that includes a reflective polarizer and a substrate, wherein the reflective polarizer and the substrate are fixed together, and wherein the touch panel does not create a phase difference in light. It is preferable that the substrate be a glass substrate with a thickness of greater than or equal to 0.1 mm and less than or equal to 0.4 mm.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: January 8, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Masahiro Hasegawa, Hiroyuki Hakoi, Akira Sakai, Kiyoshi Minoura
  • Publication number: 20180348553
    Abstract: A liquid crystal display device includes a transmissive region and a reflective region, and includes a backlight unit and a liquid crystal display panel including a first substrate, a first alignment film, a liquid crystal layer containing liquid crystal molecules having positive anisotropy of dielectric constant, a second alignment film, and a second substrate in the given order from closest to farthest from the backlight unit, the first substrate including a first electrode disposed in the transmissive region and the reflective region and a second electrode disposed in the transmissive region, the first substrate or the second substrate including a third electrode disposed in the reflective region, the first electrode including one or more first linear electrode portions in the transmissive region, with no voltage applied to the liquid crystal layer, the liquid crystal molecules in the transmissive region forming a given twist angle ?1, the liquid crystal molecules in the reflective region forming a given t
    Type: Application
    Filed: November 30, 2016
    Publication date: December 6, 2018
    Inventors: TAKAKO KOIDE, KIYOSHI MINOURA, KOZO NAKAMURA, AKIRA SAKAI, MASAHIRO HASEGAWA
  • Patent number: 10148942
    Abstract: A mirror display system that enables simultaneous perception of a mirror image and a video image with suppressed uncomfortable feeling includes a half mirror plate including a half mirror layer; a 3D display device; and a control unit being configured to supply a video signal to the 3D display device. The 3D display device is disposed on the back surface side of the half mirror plate and is configured to display, by the video signal, a video image for the left eye and a video image for the right eye that give a parallax on a display surface of the 3D display device. The parallax is set such that a fused video image of the video image for the left eye and the video image for the right eye is perceived on the back surface side behind the display surface of the 3D display device.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: December 4, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akira Sakai, Masahiro Hasegawa, Hiroyuki Hakoi, Kiyoshi Minoura
  • Patent number: 10146093
    Abstract: The present invention provides a mirror display that exhibits non-deteriorated display quality in a display mode and is capable of adjusting the color of reflected light in a mirror mode.
    Type: Grant
    Filed: February 15, 2016
    Date of Patent: December 4, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Akira Sakai, Hiroyuki Hakoi, Masahiro Hasegawa, Kiyoshi Minoura
  • Patent number: 10146086
    Abstract: The present invention provides a mirror display that sufficiently prevents a decrease in the screen luminance in the display mode while sufficiently increasing the reflectance in the mirror mode, and also gives excellent production efficiency.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: December 4, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Akira Sakai, Masahiro Hasegawa, Hiroyuki Hakoi, Hidefumi Yoshida, Shigeaki Mizushima