Patents Assigned to Hitachi,Ltd. and Hitachi Device Engineering Co., Ltd.
  • Publication number: 20040150780
    Abstract: In a liquid crystal display comprising a plurality of pixels each of which has an switching element, a plurality of drain drivers and gate drivers for operating the switching elements and the pixels, and a plurality of drain lines and gate lines supplying signals from the drain drivers and the gate drivers to the switching elements being formed on one of a pair of substrates sandwiching a liquid crystal layer, the present invention provides wiring lines formed on the one of a pair of substrates for transferring display data signals and a clock signal between each pair of the plurality of drain drivers adjacent to one another, and provides at least one gate circuit for at least one of the plurality of drain drivers which is controlled by the clock signal and switches the display data signals and the clock signal either (1) to be acquired by the at least one of the plurality of drain drivers or (2) to be transferred to another of the plurality of drain drivers arranged adjacent to the at least one of the plural
    Type: Application
    Filed: December 30, 2003
    Publication date: August 5, 2004
    Applicant: Hitachi, Ltd. and Hitachi Device Engineering Co., Ltd.
    Inventors: Yoshihiro Imajo, Tetsuro Izawa, Kimitoshi Ohgiichi, Hiroshi Okawara, Shiro Ueda, Nobuyuki Ishige, Tetsuya Kawamura, Hisashi Ishino, Fumiaki Komori
  • Publication number: 20040046727
    Abstract: A liquid crystal display device capable of improving display quality by enabling proper execution of receipt and acceptance of image signals through compensation for variation in duty ratios of clock signals as input to liquid crystal driver circuitry, is provided.
    Type: Application
    Filed: September 2, 2003
    Publication date: March 11, 2004
    Applicant: Hitachi, Ltd and Hitachi Device Engineering Co., Ltd.
    Inventors: Takahiro Fujioka, Shigeru Ito, Mitsuru Goto, Yozo Nakayasu, Yoshiyuki Saito
  • Publication number: 20030098648
    Abstract: Electroluminescence elements mounted on a substrate of an OLED display device are sealed by a protective film made of synthetic resin with chemical reaction curing in place of a sealing can. The protective film is formed such that a thickness thereof is equal to or larger than a thickness of the substrate. Alternatively, the protective film is formed by laminating a plurality of resin films which differ in one of the water absorption ratio, the elastic modulus and the hardness. With respect to the protective film which is formed of a plurality of laminated films, compared to the protective film at the electroluminescence element side, the protective film which covers the former protective film has the water absorption ratio, the elastic modulus or the hardness larger than the water absorption ratio, the elastic modulus or the hardness of the former protective film.
    Type: Application
    Filed: November 22, 2002
    Publication date: May 29, 2003
    Applicant: Hitachi, Ltd. and Hitachi Device Engineering Co. Ltd.
    Inventors: Hiroaki Miwa, Katsuhiko Ishii, Setsuo Kobayashi, Yuji Mori
  • Publication number: 20020191131
    Abstract: In a liquid crystal display device comprising a pair of substrates between which a liquid crystal layer is interposed, a display surface provided on one of the substrates, and a lighting device arranged at a side of another of the substrates, the present invention forms a light shielding film on at least one of side surfaces of the substrates along a direction perpendicular to the display surface and prevents light leak leaking from the lighting device through the at least one of side surfaces.
    Type: Application
    Filed: May 9, 2002
    Publication date: December 19, 2002
    Applicant: Hitachi, Ltd. and Hitachi Device Engineering Co. Ltd.
    Inventors: Yoko Ota, Shigeki Nishizawa, Norihisa Fukayama, Naoto Kobayashi
  • Publication number: 20020036608
    Abstract: A liquid crystal display device includes a liquid crystal display panel and a lighting device. The lighting device is supplied with alternately a first current during a period t1 and a second current during a second period t2 such that electric power E1 is lower than electric power E2. E1 is defined as (t1×ip-p(1)×Vp-p(1))/2+(t2×ip-p(2)×Vp-p(2))/2, where ip-p(1)=a peak-to-peak value of the first current, Vp-p(1)=a peak-to-peak value of a voltage across the light source during the period t1, ip-p(2)=a peak-to-peak value of the second current, and Vp-p(2)=a peak-to-peak value of a voltage across the light source during the period t2. E2 is defined as (t1+t2)×Ieff×Veff, where Ieff and Veff are effective values of the current and voltage of the light source, respectively.
    Type: Application
    Filed: August 23, 2001
    Publication date: March 28, 2002
    Applicant: Hitachi, Ltd. and Hitachi Device Engineering Co., Ltd.
    Inventors: Junichi Hirakata, Kikuo Ono, Akira Shingai
  • Publication number: 20010040545
    Abstract: There is provided a liquid crystal display device capable of decreasing the amount of generation of radiation electromagnetic noise. The liquid crystal display device includes plural driving circuits, a display control device which transmits display data and a clock signal to the plural driving circuits, and a circuit board, and supplies the display data and the clock signal transmitted from the display control device, to each of the driving circuits via a bus line and a clock signal line in the circuit board. Each of the bus line and the clock signal line is formed in a continuous area of the circuit board and is divided into plural lines. The display control device supplies the display data and the clock signal to each of the divided bus lines and clock signal lines in sequence in accordance with transmission timing.
    Type: Application
    Filed: May 10, 2001
    Publication date: November 15, 2001
    Applicant: Hitachi, Ltd. and Hitachi Device Engineering Co., Ltd.
    Inventors: Yasuyuki Mishima, Yoshio Oowaki
  • Publication number: 20010017609
    Abstract: A level converter circuit includes an input terminal adapted to be supplied with a signal swinging from a first voltage to a second voltage lower than the first voltage; a first transistor having a gate electrode connected to the input terminal, and a source electrode connected to ground potential; a second transistor having a gate electrode connected to a drain electrode of the first transistor, a source electrode connected to a supply voltage, and a drain electrode connected to an output terminal; a load circuit connected between the gate electrode of the second transistor and the supply voltage; a third transistor having a source electrode connected to the input terminal, a drain electrode connected to the output terminal, and a gate electrode supplied with a DC voltage higher than the second voltage and lower than the first voltage.
    Type: Application
    Filed: February 12, 2001
    Publication date: August 30, 2001
    Applicant: Hitachi, Ltd. and Hitachi Device Engineering Co., Ltd.
    Inventors: Haruhisa Okumura, Yukihide Ode
  • Publication number: 20010010569
    Abstract: In a liquid crystal display device including a pair of substrates between which a liquid crystal layer is interposed, a semiconductor integrated circuit device provided at a periphery of a liquid crystal layer side surface of one substrate of the pair of substrates, a frame member having a display window and covering the substrates, and a spacer provided between the frame member and the periphery of the liquid crystal side surface of the one substrate, the present invention prevents the substrate from being cracked during assembly processes thereof and improves product quality thereof by protruding one side of the spacer toward another substrate of the pair of substrates partly, disposing the semiconductor integrated circuit device along a concave part of the spacer with respect to the another substrate, and providing an adhesive at a surface of the protruded part of the spacer opposite to the liquid crystal layer side surface.
    Type: Application
    Filed: January 24, 2001
    Publication date: August 2, 2001
    Applicant: Hitachi,Ltd. and Hitachi Device Engineering Co., Ltd.
    Inventors: Nobutaka Jin, Atsushi Nemoto