Patents by Inventor Sukekazu Aratani

Sukekazu Aratani 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: 7483002
    Abstract: Pixels in a picture image display device are driven in such a manner that while introducing light, a quenching period is initiated in which electro optical elements in the pixels are quenched after scanning a plurality of gate lines for displaying one picture image. In other words, the pixels are driven while interposing the light quenching period in which the electro optical elements are quenched between one frame and a subsequent frame. Thereby, the phenomenon of blurred edges at the time of motion picture display, when the pixels including the electro optical elements are driven through an active matrix drive circuit, is suppressed and the picture quality of the picture image display device is improved.
    Type: Grant
    Filed: April 12, 2004
    Date of Patent: January 27, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiyuki Kaneko, Sukekazu Aratani
  • Publication number: 20090015146
    Abstract: The present invention provides a top-emission-type organic EL display device, that is, an organic EL display device which can suppress changes of a threshold voltage and a light emitting start voltage, and the generation of brightness irregularities. The organic EL display device includes lower electrodes arranged on a main surface of an element substrate, a multi-layered organic EL layer arranged on the lower electrodes, and a light transmitting upper electrode arranged on the organic EL layer. A layer in contact with the lower electrode of the organic EL layer forms a hole injection layer constituted of a V2O5 layer.
    Type: Application
    Filed: February 27, 2008
    Publication date: January 15, 2009
    Inventors: Masahiro TANAKA, Toshiyuki MATSUURA, Sukekazu ARATANI, Masao SHIMIZU
  • Publication number: 20080309225
    Abstract: The present invention provides an organic electroluminescent display device of high efficiency and high quality, in which the efficiency for injecting electrons from a reflective cathode is improved. The organic electroluminescent display device includes a substrate, a cathode, an organic layer, and an anode. The cathode is formed above the substrate. The organic layer has a luminescent layer and is formed on the cathode. The anode is formed on the organic layer. Light emitted from the luminescent layer is extracted through the anode. The cathode is composed of an alloy containing aluminum as a main component and as a subcomponent at least one metal of oxides whose Gibbs free energies of formation are greater than that of an aluminum oxide.
    Type: Application
    Filed: May 14, 2008
    Publication date: December 18, 2008
    Inventors: Masao SHIMIZU, Sukekazu Aratani, Toshiyuki Matsuura, Masahiro Tanaka
  • Publication number: 20080303998
    Abstract: A liquid crystal display device includes a pair of substrates with a liquid crystal layer therebetween with a plurality of scanning signal lines and of video signal lines being formed on a first substrate. The scanning and video signal lines are arranged in a shape of a grid, and a pixel region is defined as a region surrounded by the scanning and video signal lines. A black matrix is formed on a second substrate, is arranged in a position overlapped on the scanning and video signal lines, and has an opening portion in each pixel region. A plurality of first electrodes are provided on the first substrate, and a plurality of second electrodes are provided on the second substrate, wherein at least one of first electrodes and at least one of the second electrodes are arranged in a position overlapped with the opening portion.
    Type: Application
    Filed: March 12, 2008
    Publication date: December 11, 2008
    Inventors: Masuyuki OHTA, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Publication number: 20080299861
    Abstract: A scanning line, a signal line, a first current supply line, and a second current supply line are formed on a glass substrate, a first electrode is formed on the wiring layer comprising the above members, an organic layer comprising a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer is formed on the first electrode, a second electrode is formed as cathode on the electron injection layer, the first electrode as anode is connected to a plus terminal of a power source through the driving devices and the first current supply line, whereas the second electrode as cathode is connected to a minus terminal of the power source, and is connected to the second current supply line in the display region of each pixel, with a contact hole serving as a feeding point, whereby wiring resistance due to the second electrode is reduced, and variations in the brightness of a panel is reduced.
    Type: Application
    Filed: August 1, 2008
    Publication date: December 4, 2008
    Inventors: Shingo ISHIHARA, Takayuki Ouchi, Toshiro Mikami, Kazuhito Masuda, Sukekazu Aratani
  • Publication number: 20080284321
    Abstract: Provided is a top emission type organic light-emitting display device having the emission luminance thereof improved by increasing a quantity of electrons injected into an electron injection layer. At least a cathode, an electron injection layer, an electron transport layer, a light-emitting layer, a hole transport layer, and an anode are sequentially accumulated on an insulating substrate. The electron injection layer is formed with a co-deposited layer having both tris(8-hydroxyquinoline)aluminum (Alq3) and lithium (Li) evaporated thereon. The electron transport layer is formed with a deposited layer having tris (8-hydroxyquinoline)aluminum (Alq3) evaporated thereon. The ratio of Li to Alq3 in the co-deposited layer is equal to or larger than 1 and equal to or smaller than 3. The thickness of the co-deposited layer is equal to or larger than 1 nm and equal to or smaller than 3 nm. The thickness of the Alq3-deposited layer is equal to or larger than 5 nm and equal to or smaller than 7.5 nm.
    Type: Application
    Filed: November 27, 2007
    Publication date: November 20, 2008
    Inventors: Masahiro Tanaka, Toshiyuki Matsuura, Sukekazu Aratani, Masao Shimizu
  • Publication number: 20080265760
    Abstract: It is an object of the present invention to provide an organic light-emitting display device which can be simply produced by a wet process, and exhibit a high efficiency and long serviceability. The present invention provides an organic light-emitting display device having an organic light-emitting layer 3 placed between an upper electrode 5 and a lower electrode 1, one of the upper electrode 5 and the lower electrode 1 is transparent electrode and the other is a light-reflecting electrode, wherein the organic light-emitting layer 3 contains a binder, hole transport material, electron transport material and light-emitting dopant.
    Type: Application
    Filed: April 24, 2008
    Publication date: October 30, 2008
    Inventors: Sukekazu Aratani, Yasushi Tomioka
  • Patent number: 7408197
    Abstract: A scanning line, a signal line, a first current supply line, and a second current supply line are formed on a glass substrate, a first electrode is formed on the wiring layer comprising the above members, an organic layer comprising a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer is formed on the first electrode, a second electrode is formed as cathode on the electron injection layer, the first electrode as anode is connected to a plus terminal of a power source through the driving devices and the first current supply line, whereas the second electrode as cathode is connected to a minus terminal of the power source, and is connected to the second current supply line in the display region of each pixel, with a contact hole serving as a feeding point, whereby wiring resistance due to the second electrode is reduced, and variations in the brightness of a panel is reduced.
    Type: Grant
    Filed: February 1, 2005
    Date of Patent: August 5, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Shingo Ishihara, Takayuki Ouchi, Toshiro Mikami, Kazuhito Masuda, Sukekazu Aratani
  • Publication number: 20080143253
    Abstract: Light-emitting devices (24) and light-emitting displays (1) for realizing bright display by allowing light emitted from an emissive layer (100) to efficiently contribute to a display. Polarization separators (500) are arranged between the emissive layer (100) and a phase plate (700). In the light of a wavelength range which includes a part or all of a light-emission wavelength range of the emissive layer and is narrower than a visible wavelength range and is directed from the emissive layer side to the polarization separators side, the polarization separators (500) reflect circularly polarized light components which are converted into linearly polarized light that is absorbed by the polarizer (600) due to the operation of the phase plate and transmit the other light.
    Type: Application
    Filed: December 31, 2007
    Publication date: June 19, 2008
    Inventors: Masaya Adachi, Yoshiyuki Kaneko, Sukekazu Aratani, Shingo Ishihara
  • Publication number: 20080136339
    Abstract: The invention allows a top-emission-type organic EL display device to use a chemically stable conductive film containing ITO for forming a lower electrode of an organic EL layer. The organic EL layer includes an electron injection layer, an electron transport layer, a light emission layer, a hole transport layer and a hole injection layer. An upper electrode which constitutes a transparent electrode is formed of an IZO film. A lower electrode adopts the two-layered structure consisting of a lower layer made of Al or an Al alloy having high reflectance and an upper layer formed of a chemically stable ITO film. To enable the injection of electrons from the ITO film which constitutes the lower electrode, the electron injection layer is formed using a film which is acquired by co-depositing Li and Alq3 at a molecular ratio of 3:1. Due to such a constitution, electrons can be injected from the ITO film thus realizing the top-emission-type organic EL display device.
    Type: Application
    Filed: November 14, 2007
    Publication date: June 12, 2008
    Inventors: Toshiyuki Matsuura, Masahiro Tanaka, Sukekazu Aratani, Masao Shimizu
  • Patent number: 7345729
    Abstract: A liquid crystal display device includes a pair of substrates with a liquid crystal layer therebetween, a plurality of scanning signal lines and a plurality of video signal lines formed on one of said pair of substrates, a plurality of first electrodes on the one of said pair of substrates and a plurality of second electrodes on the one of said pair of substrates to drive the liquid crystal by a voltage difference with respect to the first electrode. The first electrodes have a bent form, and the second electrodes have a rectangular form.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: March 18, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Patent number: 7339316
    Abstract: Light-emitting devices and light-emitting displays for realizing bright display by allowing light emitted from an emissive layer to efficiently contribute to a display. Polarization separators are arranged between the emissive layer and a phase plate. In the light of a wavelength range which includes a part or all of a light-emission wavelength range of the emissive layer and is narrower than a visible wavelength range and is directed from the emissive layer side to the polarization separators side, the polarization separators reflect circularly polarized light components which are converted into linearly polarized light that is absorbed by the polarizer due to the operation of the phase plate and transmit the other light.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: March 4, 2008
    Assignee: Hitachi, Ltd
    Inventors: Masaya Adachi, Yoshiyuki Kaneko, Sukekazu Aratani, Shingo Ishihara
  • Publication number: 20080042550
    Abstract: The present invention ensures performance and reliability of a top-emission-type organic EL display device, reduces manufacturing steps by simplifying the structure of the display device, and reduces a manufacturing cost. TFTs each of which has a semiconductor layer, a gate insulation film which covers the semiconductor layer and a gate electrode are formed on a substrate. An interlayer insulation film is formed on the substrate to cover the TFTs. Lower layer portions of SD lines formed of a multi-layered film which are formed on the interlayer insulation film constitute a lower electrode of an organic EL layer, and a passivation film which covers the TFTs and the SD lines plays a role of a bank which separates pixels. An uppermost layer of the SD line is formed of a chemically stable metal oxide film, and the SD layer is used as it is. On the other hand, as a lower electrode of an organic EL layer, an upper layer of the SD line is removed and an Al—Si alloy film of the SD line is used.
    Type: Application
    Filed: July 6, 2007
    Publication date: February 21, 2008
    Inventors: Toshiyuki Matsuura, Masahiro Tanaka, Sukekazu Aratani, Masao Shimizu
  • Publication number: 20080030129
    Abstract: An organic light-emitting display device is provided which achieves high efficiency by reducing the number of steps for vapor deposition using a mask with a fine pattern and photolithography. A blue light-emitting portion (B), a green light-emitting portion (G) and a red light-emitting portion (R) placed on a substrate 10 have a thickness relationship represented as (blue light-emitting portion (B)<green light-emitting portion (G)=red light-emitting portion (R)), so that the green light-emitting portion (G) and the red light-emitting portion are formed with common deposition steps. In addition, an electron injection layer 2 and an electron transport layer 3 between a lower electrode and an organic light-emitting layer 4 are formed with common depositions steps in the light-emitting portions (B, G and R).
    Type: Application
    Filed: August 3, 2007
    Publication date: February 7, 2008
    Inventors: Sukekazu Aratani, Masao Shimizu, Toshiyuki Matsuura, Masahiro Tanaka, Masaya Adachi
  • Publication number: 20070285410
    Abstract: An illuminating device includes a light-condensing sheet, a light-emitting portion, and a control unit. The light-condensing sheet includes a plurality of lenses each with a light-condensing function ranged on a light transmittance substrate. The light-emitting portion is opposed to the light-condensing sheet and includes light-emitting areas with respective dimensions. The control unit switches a luminous state of the light-emitting area to a non-luminous state or vice versa. A display device is provided with the illuminating device described above.
    Type: Application
    Filed: June 6, 2007
    Publication date: December 13, 2007
    Inventors: Toshinari Shibasaki, Hideo Homma, Katsusuke Shimazaki, Masaya Adachi, Sukekazu Aratani
  • Patent number: 7297377
    Abstract: A liquid crystal display device having a pair of substrates, a liquid crystal layer filled between the pair of substrates and a plurality of pixel electrodes and common electrodes formed on one of the pair of substrates for supplying an electric field to the liquid crystal layer. The liquid crystal display device is configured so that a response time between a lowest brightness level and a highest brightness level is less than 16.7 ms, and the liquid crystal layer contains a range of 40% or more weight percentage to 100% or less weight percentage of a constituent component with a dielectric anisotropy of ???1.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: November 20, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Kagawa, Shintaro Takeda, Kotaro Araya, Sukekazu Aratani, Katsumi Kondo
  • Patent number: 7291973
    Abstract: An organic light-emitting display is provided which includes an organic electroluminescent (EL) substrate, a drive layer formed on the substrate, a first electrode formed on the drive layer; organic layers formed on the first electrode, a second electrode formed on the organic layers, and a plurality of pixels. A counter substrate is formed adjacent the organic EL substrate, and a light extraction layer is formed between the substrate and the counter substrate. Each of the pixels includes sub-pixels and is disposed such that an auxiliary electrode of the second electrode is disposed in a part of one of the sub-pixels. The auxiliary electrode is formed on a same level as the first electrode and is connected to a current supply line within the drive layer via a contact hole formed in an inter-layer insulating layer formed over the drive layer.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: November 6, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Shingo Ishihara, Sukekazu Aratani, Masaya Adachi
  • Publication number: 20070229453
    Abstract: A liquid crystal display apparatus includes a liquid crystal display unit for displaying image signals, a lighting device including a light-adjustment unit for adjusting a quantity of light from a light source, which is transmitted to each of plural regions into which the lighting device is divided for illuminating corresponding plural illumination regions of an entirety of a display area of the liquid crystal display unit, and a control unit. The control unit controls each light-adjustment unit in synchronization with horizontal synchronization signals and vertical synchronization signals, so that the adjusted light quantity of individual ones of the plural regions of the divided lighting device is shifted among the plural regions and an individual illumination region of the plural illumination regions of the entirety of the display area of the liquid crystal display unit is correspondingly shifted therewith.
    Type: Application
    Filed: June 13, 2007
    Publication date: October 4, 2007
    Inventors: Sukekazu Aratani, Ikuo Hiyama, Masaya Adachi, Tsunenori Yamamoto, Katsumi Kondo
  • Patent number: 7233304
    Abstract: A liquid crystal display apparatus comprises a liquid crystal display unit including a pair of substrates, at least one of which is transparent, a liquid crystal layer sandwiched by the pair of substrates, a plurality of electrodes for applying an electric field to at least one of the pair of substrates, and a plurality of active elements connected to the plurality of electrodes; a lighting device including a plurality of light sources; and a control unit for controlling ON/OFF of at least one light source for each of regions, into which the lighting device is divided, based on a display response of said liquid crystal display unit.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: June 19, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Sukekazu Aratani, Ikuo Hiyama, Masaya Adachi, Tsunenori Yamamoto, Katsumi Kondo
  • Publication number: 20070052901
    Abstract: An active matrix liquid crystal display device includes first and second substrates, a liquid crystal layer disposed between the first and second substrates, and plural image signal lines and scan signal lines formed on the first substrate. Respective pixel regions are formed by adjacent image signal lines and adjacent scan signal lines and have at least an active device, with a first electrode and a second electrode being provided in each pixel region. The first electrode is connected to the active device of one pixel region, and the second electrode of one pixel region is connected to the second electrode of an other pixel region which adjoins the one pixel region in the extended direction of the image signal line. The second electrode is connected for at least three adjacent pixel regions in the extended direction of the image signal line.
    Type: Application
    Filed: November 2, 2006
    Publication date: March 8, 2007
    Inventors: Masuyuki Ohta, Kazuhiro Ogawa, Keiichiro Ashizawa, Kazuhiko Yanagawa, Masahiro Yanai, Nobutake Konishi, Nobuyuki Suzuki, Masahiro Ishii, Makoto Yoneya, Sukekazu Aratani