Patents by Inventor Yoshiro Mikami

Yoshiro Mikami 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: 20120127146
    Abstract: In an organic electroluminescent light emitting display device comprising a plurality of pixels each of which includes an organic electroluminescent element emitting light by a current supplied thereto, a plurality of active elements including a first active element which acquires a data signal and a second active element which regulates the current supplied to the organic electroluminescent element in accordance with the data signal, and a capacitive element storing the data signal, the present invention utilizes a part of the capacitive element arranged in one of the pixels for a light shielding member which shields the plurality of active elements arranged the one of the pixels from light emitted by the organic electroluminescent element arranged therein or another pixel adjacent thereto so as to suppress image quality deterioration and smear appearing in an image display area of the organic electroluminescent light emitting display device.
    Type: Application
    Filed: February 2, 2012
    Publication date: May 24, 2012
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Hitachi Displays, Ltd.
    Inventors: Toshihiro Sato, Genshiro Kawachi, Yoshiro Mikami, Masaya Adachi
  • Publication number: 20120075563
    Abstract: Provided is a liquid crystal display device, including: a liquid crystal layer filled between a first and a second substrate; two polymer structures; and a plurality of pixels each including a first and a second electrode, one of the first and the second electrode being a pixel electrode, in which: each of the plurality of pixels is provided within a region surrounded by a signal line, a part of the signal line being formed between adjacent two of the plurality of pixels; each of the two polymer structures, which extends along the part of the signal line so as to sandwich the part of the signal line in plan view and is formed from one of the first and the second substrate toward another thereof, is formed so as to overlap with any of the region; and the two adjacent polymer structures has the liquid crystal layer provided therebetween.
    Type: Application
    Filed: August 19, 2011
    Publication date: March 29, 2012
    Inventors: Shintaro TAKEDA, Kotaro Araya, Yasushi Tomioka, Masaki Matsumori, Yoshiro Mikami
  • Patent number: 8134524
    Abstract: In an organic electroluminescent light emitting display device comprising a plurality of pixels each of which includes an organic electroluminescent element emitting light by a current supplied thereto, a plurality of active elements including a first active element which acquires a data signal and a second active element which regulates the current supplied to the organic electroluminescent element in accordance with the data signal, and a capacitive element storing the data signal, the present invention utilizes a part of the capacitive element arranged in one of the pixels for a light shielding member which shields the plurality of active elements arranged the one of the pixels from light emitted by the organic electroluminescent element arranged therein or another pixel adjacent thereto so as to suppress image quality deterioration and smear appearing in an image display area of the organic electroluminescent light emitting display device.
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: March 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Toshihiro Sato, Genshiro Kawachi, Yoshiro Mikami, Masaya Adachi
  • Publication number: 20120019897
    Abstract: A suspended particle device which enables light control without requiring any complicated switching circuit to be formed on a substrate is realized. A suspension containing charged particles and a disperse medium is filled between an A-substrate and a B-substrate, and first and second electrodes are formed on the A-substrate. A DC voltage is applied across the first and second electrodes to localize the charged particles on the second electrode side. Subsequently, an AC voltage is applied across the first and second electrodes to orient, while maintaining the localized state of the charged particles, the charged particles along a direction of an electric field. Light transmittance is lower in an area where the charged particles are present than in an area where no charged particles are present, whereas, in the area where the charged particles are present, the light transmittance can be controlled by adjusting the AC voltage.
    Type: Application
    Filed: July 25, 2011
    Publication date: January 26, 2012
    Inventors: Shunsuke MORI, Yoshiro MIKAMI, Toshiaki KUSUNOKI
  • Patent number: 8085220
    Abstract: A plasma display apparatus having a priming discharge region PDC partitioned from a display discharge cell DDC, by a traverse rib, at a side where the second electrode between the display discharge cell DDC adjacent in a row direction is adjacent; a second longitudinal rib partitioning the priming discharge region PDC; a third longitudinal rib, further partitioning a region partitioned by the second longitudinal rib into two sections; a convex electrode; and a gap connecting the display discharge cell DDC and the priming discharge cell PDC, wherein a sum of a width in a line direction of a nearly rectangular space region containing adjacent two priming discharge cells PDCs, and a pattern width of the second longitudinal rib is designed larger than a sum of a width in the row direction and a pattern width of the traverse rib.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: December 27, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Shunichiro Nobuki, Norihiro Uemura, Masakazu Sagawa, Keizo Suzuki, Yoshiro Mikami, Hideto Momose, Shirun Ho
  • Publication number: 20110187953
    Abstract: In a liquid crystal display device, the reduction of power consumption is realized by reddening a backlight while maintaining a white balance. An aperture ratio of a red subpixel and an aperture ratio of a blue subpixel are set such that, in a state where an aperture ratio of a green subpixel in each pixel of a liquid crystal panel is fixed to a desired value, white brightness efficiency takes a maximum value which is set based on a balance between light emission efficiency which is increased corresponding to lowering of a color temperature of the backlight and transmissivity of the pixel which is decreased corresponding to the increase of the aperture ratio of the blue subpixel.
    Type: Application
    Filed: January 28, 2011
    Publication date: August 4, 2011
    Inventors: Ikuo HIYAMA, Kentaro Ojima, Masahiro Ishii, Shisei Katou, Yoshiro Mikami
  • Publication number: 20110181809
    Abstract: The side surface of the light guide plate includes an incident surface which faces the light source unit in an opposed manner, and a fixing surface which is directed in the left-and-right direction orthogonal to the top-and-bottom direction which is the direction along which the light source unit and the incident surface each other in an opposed manner. An engaging portion which is engageable with a lower frame is formed on the fixing surface or an edge portion which forms the fixing surface. The engaging portion is configured to allow a change of a distance between the incident surface and the lower frame due to expansion or shrinkage of the light guide plate while restricting the movement of the light guide plate in the top-and-bottom direction.
    Type: Application
    Filed: January 24, 2011
    Publication date: July 28, 2011
    Inventors: Yoshifumi Sekiguchi, Yoshiro Mikami, Ikuo Hiyama, Naoki Iwasaki, Masaki Tsubokura
  • Patent number: 7928952
    Abstract: An image display device has a display pixel area having plural pixels arranged in a matrix fashion, plural signal lines for supplying display signal voltages to the pixels, and plural pixel selection lines for selecting pixels from among the pixels to be supplied with the display signal voltages. The pixel selection lines include Y-direction selection lines for selecting rows of the pixels arranged in the matrix fashion and X-direction selection lines for selecting columns of the pixels, and the image display device includes a circuit configuration in which the display signal voltages are supplied from the signal lines to only ones of the pixels each having selected simultaneously both of a corresponding one of the Y-direction selection lines and a corresponding one of the X-direction selection lines.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: April 19, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Hajime Akimoto, Mitsuru Hiraki, Hitoshi Nakahara, Takashi Akioka, Yoshiyuki Kaneko, Makoto Tsumura, Yoshiro Mikami
  • Publication number: 20110075073
    Abstract: A liquid crystal display includes: a pair of substrates including at least one transparent substrate; a liquid crystal layer disposed between the pair of substrates; and an electrode group formed on at least one of the pair of substrates so as to apply an electric field to the liquid crystal layer. The liquid crystal layer contains at least one kind of liquid crystalline compound and at least one kind of chiral dopant. The concentration c of the chiral dopant is lower than a saturation solubility s thereof. The concentration c of the chiral dopant and a helical twisting power [HTP] of the chiral dopant satisfy a relation of [HTP]·c?5.5 (?m?1).
    Type: Application
    Filed: August 20, 2010
    Publication date: March 31, 2011
    Inventors: Mika Oiwa, Shintaro Takeda, Kotaro Araya, Yasushi Tomioka, Yoshiro Mikami
  • Publication number: 20110063819
    Abstract: There are provided a backlight capable of improving luminance efficiency (brightness efficiency) by devising a structure of a HCFL to allow adjustment of a cold spot temperature, and further provided a liquid crystal display device using the backlight. A distance (cathode length) between one tube end portion and one filament of a pair of filaments is set longer than a distance (cathode length) between the other tube end portion and the other filament. In this manner, at least the tube end portion on the longer cathode length side can be set as the cold spot. Further, a tube end portion of a hot cathode fluorescent tube is arranged outside a lamp house. In this manner, the cold spot set at the tube end portion of the hot cathode fluorescent tube can be arranged outside the lamp house where the temperature is low, and the cold spot temperature can be decreased.
    Type: Application
    Filed: May 27, 2010
    Publication date: March 17, 2011
    Inventors: Kenichi YAMAMOTO, Yoshiro Mikami, Shin Imamura, Makoto Katagishi
  • Publication number: 20110062866
    Abstract: A protective layer has, on its back side, an electron emissive layer formed of magnesium oxide crystals. Based on a front view of discharge cells C, there are defined intersection regions (first regions) where display electrode pairs (each including a sustain electrode X and a scan electrode Y) and address electrodes Z intersect and a remaining region (a second region) E1 excluding the intersection regions. The surface density of the magnesium oxide crystals forming the electron emissive layer over the intersection regions (the first regions) is equal to or lower than half the surface density of the magnesium oxide crystals forming the electron emissive layer over the remaining region (the second region) E1 excluding the intersection regions.
    Type: Application
    Filed: August 5, 2010
    Publication date: March 17, 2011
    Applicant: HITACHI CONSUMER ELECTRONICS CO., LTD.
    Inventors: Takeshi TAMAKOSHI, Mitsuharu IKEDA, Keizo SUZUKI, Shirun HO, Yoshiro MIKAMI
  • Publication number: 20100134454
    Abstract: In an organic electroluminescent light emitting display device comprising a plurality of pixels each of which includes an organic electroluminescent element emitting light by a current supplied thereto, a plurality of active elements including a first active element which acquires a data signal and a second active element which regulates the current supplied to the organic electroluminescent element in accordance with the data signal, and a capacitive element storing the data signal, the present invention utilizes a part of the capacitive element arranged in one of the pixels for a light shielding member which shields the plurality of active elements arranged the one of the pixels from light emitted by the organic electroluminescent element arranged therein or another pixel adjacent thereto so as to suppress image quality deterioration and smear appearing in an image display area of the organic electroluminescent light emitting display device.
    Type: Application
    Filed: February 2, 2010
    Publication date: June 3, 2010
    Inventors: Toshihiro Sato, Genshiro Kawachi, Yoshiro Mikami, Masaya Adachi
  • Patent number: 7692609
    Abstract: An active matrix type display includes a light emission device having a transparent pixel electrode and a metal pixel electrode on both surfaces of a light emitting layer and a driving circuit controlling the driving current of the light emission device. The driving circuit is formed on a substrate, and the light emission device is formed as a layer above the driving circuit with an intermediate layer of insulation material interposed therebetween. The metal pixel electrode device is connected with the driving circuit through a conduction portion which extends through the intermediate layer. Thus, light emitted from the light emission device can be prevented from reaching transistors by locating the transistors below the metal pixel electrode, and leakage current produced by the light of a transistor in the off state can be suppressed to prevent degradation of the image quality.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: April 6, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Takayuki Ouchi, Shingo Ishihara, Yoshiro Mikami
  • Patent number: 7667674
    Abstract: In an organic electroluminescent light emitting display device comprising a plurality of pixels each of which includes an organic electroluminescent element emitting light by a current supplied thereto, a plurality of active elements including a first active element which acquires a data signal and a second active element which regulates the current supplied to the organic electroluminescent element in accordance with the data signal, and a capacitive element storing the data signal, the present invention utilizes a part of the capacitive element arranged in one of the pixels for a light shielding member which shields the plurality of active elements arranged the one of the pixels from light emitted by the organic electroluminescent element arranged therein or another pixel adjacent thereto so as to suppress image quality deterioration and smear appearing in an image display area of the organic electroluminescent light emitting display device.
    Type: Grant
    Filed: May 1, 2007
    Date of Patent: February 23, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Toshihiro Sato, Genshiro Kawachi, Yoshiro Mikami, Masaya Adachi
  • Patent number: 7629743
    Abstract: The present invention provides OLEDs of the top emission type comprising organic light-emitting (LE) elements by preventing the problems such as the widening of the power lines, the reduction in the aperture ratio caused by the widening of the upper and the lower capacitor electrodes and the short circuit between the upper and the lower electrodes caused by the roughness of the flattening layers. Two kinds of the OLEDs are provided. One is an OLED comprising a region of LE layer sandwiched between the upper and lower electrodes is formed on a power line of TFT for driving the pixel. Another comprises a region of the LE layer formed on an electrode of capacitor connected to the TFTs to control the light-emitting element. Accordingly, without forming a flattening layer on the light-emitting layer, there is no electric short circuit between the lower electrode and the upper electrode.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: December 8, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Hajime Murakami, Yoshiro Mikami, Etsuko Nishimura, Shingo Ishihara, Masao Shimizu, Kenichi Onisawa
  • Publication number: 20090225008
    Abstract: A plasma display apparatus having a priming discharge region PDC partitioned from a display discharge cell DDC, by a traverse rib, at a side where the second electrode between the display discharge cell DDC adjacent in a row direction is adjacent; a second longitudinal rib partitioning the priming discharge region PDC; a third longitudinal rib, further partitioning a region partitioned by the second longitudinal rib into two sections; a convex electrode; and a gap connecting the display discharge cell DDC and the priming discharge cell PDC, wherein a sum of a width in a line direction of a nearly rectangular space region containing adjacent two priming discharge cells PDCs, and a pattern width of the second longitudinal rib is designed larger than a sum of a width in the row direction and a pattern width of the traverse rib.
    Type: Application
    Filed: November 26, 2008
    Publication date: September 10, 2009
    Inventors: Shunichiro Nobuki, Norihiro Uemura, Masakazu Sagawa, Keizo Suzuki, Yoshiro Mikami, Hideto Momose, Shirun Ho
  • Patent number: 7567327
    Abstract: A liquid crystal display device of low power consumption which exhibits high image quality is realized. To each liquid-crystal-side pixel region of one substrate out of respective substrates which are arranged while sandwiching liquid crystal therebetween, a first switching element and a second switching element which are operated in response to a scanning signal from a gate signal line, a pixel electrode to which a video signal is supplied from the drain signal line through the first switching element, and a counter electrode to which a reference voltage signal is supplied from a reference voltage signal line through the second switching element, and the pixel electrode and the counter electrode are respectively formed of strip-like transparent conductive layers and are substantially alternately arranged in the inside of the pixel region.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: July 28, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Genshiro Kawachi, Hideo Sato, Toshio Miyazawa, Yoshiro Mikami, Katsumi Kondo
  • Publication number: 20090184895
    Abstract: A high-definition, high-quality, and high-contrast PDP that features high brightness, guaranteed long life, and stable driving, is provided by improving the time-dependent degradation of address discharge delay. The PDP includes: a front substrate having bus electrodes, and sustain discharge electrodes extending in a lateral direction of the bus electrodes to form display lines; a back substrate having address electrodes facing the sustain discharge electrodes in the lateral direction of the bus electrodes; and discharge cells formed between the substrates. Each of the discharge cells includes a sustain discharge cell and a priming discharge cell, in which a protruding electrode is formed to extend in a direction opposite to the discharge gap from the bus electrode, and a predetermined space is provided between the two cells to supply priming. The shape and size of the space are optimized so that the sustain discharge does not spread to the address discharge cell through the space.
    Type: Application
    Filed: December 29, 2008
    Publication date: July 23, 2009
    Inventors: Norihiro Uemura, Shunichiro Nobuki, Masakazu Sagawa, Shirun Ho, Keizo Suzuki, Yoshiro Mikami
  • Publication number: 20090009054
    Abstract: An MIM electron source is comprised of a lower electrode, an insulation film and an upper electrode. By depositing a coat film on the upper electrode through a sputter process using a sputter target of alkaline glass having a modifier component of an alkaline metal oxide or alkaline earth metal oxide, the work function of the upper electrode can be lowered. As a result, the electron emission efficiency can be increased stably.
    Type: Application
    Filed: April 4, 2008
    Publication date: January 8, 2009
    Inventors: Toshiaki Kusunoki, Motoyuki Miyata, Takashi Naito, Mitsuharu Ikeda, Yoshiro Mikami, Etsuko Nishimura
  • Publication number: 20090001870
    Abstract: A protruded portion of an adjacent scan line is provided along one of longer sides of an electron emission area, for functioning as a focusing electrode. A feeding electrode is provided along the other longer side of the electron emission part. Use of this arrangement improves the ability to feed current from a scan line(s). Thus, a distribution of drive current within an element electrode is dispersed, thereby to improve the reliability of an electron emission element. Additionally, in the case of a thin-film electron source being used as this element, the improvement in current feeding ability enables a top electrode to decrease in thickness, thus increasing the electron emission efficiency.
    Type: Application
    Filed: May 28, 2008
    Publication date: January 1, 2009
    Inventors: Mutsumi Suzuki, Masakazu Sagawa, Yoshiro Mikami