Patents Assigned to Hitachi Displays, Ltd.
  • Patent number: 8537136
    Abstract: Provided is an electrostatic capacity type touch panel, which responds to not only an input by a finger but also a touch by a nonconductive input member. Disposed are X electrodes XP and Y electrodes YP that cross each other via a first insulating layer 2, and a Z electrode formed of a transparent elastic conductive resin layer 4 via a second insulating layer 3. The transparent elastic conductive resin layer 4 is a high polymer elastic resin layer in which conductive fine particles are dispersed, and is made of a material in which density of the conductive fine particles is increased by pressure of a touch.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: September 17, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Shinji Sekiguchi, Koji Nagata, Kouji Hayakawa
  • Publication number: 20130235319
    Abstract: A display device which can ensure sufficient adhesive strength between each pair of substrates of a liquid crystal display panel and a sealing material includes: a first substrate having a predetermined integrated circuit; a second substrate on one surface of the first substrate in an overlapping manner; and an adhesive material between the first substrate and the second substrate that has an annular planar shape. The adhesive material adheres the first substrate and the second substrate, wherein an outer periphery of the adhesive material includes a zone which includes a plurality of first portions passing substantially the same position as an outer periphery of the surface of the first substrate and a plurality of second portions each connected with the two neighboring first portions and having a center portion thereof in a peripheral direction retracted toward an inner peripheral side of the adhesive material.
    Type: Application
    Filed: April 23, 2013
    Publication date: September 12, 2013
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Hitachi Displays, Ltd.
    Inventors: Aki TSUCHIYA, Takashi Yamamoto, Akira Ishii, Naoki Kikuchi, Yoshihiro Arai
  • Patent number: 8531383
    Abstract: Provided is a display device capable of producing an image of excellent quality with reduced flicker and little reduction in luminance, the display device including: a backlight having light sources such as LED devices arranged two-dimensionally, each of which may be individually modulated in luminance; a moving velocity detection unit VD1 (109) for detecting a moving velocity of an object in a video (for example, moving velocity of a foreground); and a luminance variation control unit (113) for automatically controlling luminance variations of the LED devices for each frame, in accordance with the moving velocity.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: September 10, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Goki Toshima, Junichi Maruyama, Koji Hosogi, Misa Owa, Kikuo Ono
  • Patent number: 8530898
    Abstract: A display device which uses a TFT having a gate electrode film thereof arranged on a light source side can also suppress the increase of parasitic capacitance while suppressing the generation of a light leakage current. On at least one end of the TFT, between a high concentration region which constitutes a source region or a drain region and a channel region, a first low concentration region which is arranged on a high concentration region side and exhibits low impurity concentration and a second low concentration region which exhibits impurity concentration even lower than the impurity concentration of the first low concentration region are provided in this order.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: September 10, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takeshi Noda, Takuo Kaitoh
  • Patent number: 8531637
    Abstract: A flat, solid counter electrode is formed on an organic passivation film. Before forming an interlayer insulating film on the counter electrode, plasma ashing is performed. A surface of the organic passivation film is trimmed by the plasma ashing, forming an overhang. The plasma ashing not only trims a surface of the organic passivation film but also roughens a surface of the counter electrode. This increases a contact area between the interlayer insulating film and the organic passivation film or counter electrode, increasing the adhesiveness therebetween. Further, the plasma ashing eliminates the remainder of a resist on the counter electrode, increasing the adhesiveness of the interlayer insulating film.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: September 10, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Keisuke Ishiguro, Yoichi Shinoki
  • Patent number: 8531375
    Abstract: A display device includes a display panel, a control circuit and a random number generating circuit. The random number generating circuit includes a plurality of shift registers, an output circuit, and registers which holds initial values. By providing a plurality of initial values, the randomness of random numbers can be enhanced. Further, the random numbers different from each other can be outputted from the plurality of shift registers and hence, it is possible to increase the frequency and to output the increased frequency by an output circuit. Further, by adding a noise control signal which suppresses the number of inversion of a digital signal, electromagnetic wave noises generated from a liquid crystal display device can be reduced. Further, by adopting an intermittent drive clock which intermittently repeats stopping thereof as a basic clock of the plurality of shift registers, electromagnetic wave noises generated from the display device can be reduced.
    Type: Grant
    Filed: February 20, 2009
    Date of Patent: September 10, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Fumiaki Komori
  • Patent number: 8531377
    Abstract: A liquid crystal display device used in miniaturized portable equipment includes a distribution circuit to cope with a high-definition multi-grayscale display. A distribution circuit distributes an output of a drive circuit to a plurality of video signal lines within one scanning period, the distribution circuit being divided into a plurality of distribution circuits, and control signals being supplied to each distribution circuit from both end portions of each distribution circuit. When an output part of the drive circuit is configured such that a high withstand-voltage output amplifier and a low withstand-voltage output amplifier are alternately connected with the distribution circuit, a master function and a slave function are imparted to the drive circuit so as to allow the drive circuit to cope with odd-numbered outputs.
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: September 10, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yoshihiro Kotani, Kenichi Akiyama
  • Patent number: 8531411
    Abstract: Provided is a display device including: a rectangular display panel; a first film-like printed circuit board including a first terminal portion, the first film-like printed circuit board extending from one side of the rectangular display panel in a direction; a rectangular touch panel provided so as to be opposed to the rectangular display panel; and a second film-like printed circuit board including a second terminal portion, the second film-like printed circuit board extending from one side of the rectangular touch panel in the direction, the one side of the rectangular touch panel corresponding to a side parallel with and adjacent to the one side of the rectangular display panel, the first terminal portion and the second terminal portion being provided so that a connecting direction of the first terminal portion is different from a connecting direction of the second terminal portion.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: September 10, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yuka Kuwajima, Eiji Oohira
  • Patent number: 8531489
    Abstract: A display apparatus comprises a self-luminous device display having a plurality of light emitting elements arranged in a matrix, a drive voltage generation circuit to generate a drive voltage signal for driving light emitting elements, a blanking period control-included data line drive circuit which controls the drive voltage either according to or irrelevantly to the display data, a scan line drive circuit to determine which light emitting elements to drive, and a pixel control circuit to control voltage written to pixels.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: September 10, 2013
    Assignees: Hitachi Display, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Naruhiko Kasai, Hiroki Awakura, Toshihiro Satou, Hajime Akimoto
  • Patent number: 8523421
    Abstract: To prevent, in a backlight where light emitting diodes are arranged on a side surface of a light guide plate, light leakage from a reflection sheet and reduce non-uniformity of emission light from the backlight. In a liquid crystal display device that includes a backlight that irradiates a liquid crystal panel with light, LEDs are disposed as light emitting elements on a light guide plate that is disposed in the backlight, a reflection sheet that comprises a multilayer film is disposed on a bottom surface of the light guide plate, projections are disposed by sandblasting on the bottom surface of the light guide plate in the vicinity of the LEDs, and tight adhesion between the reflection sheet and the light guide plate is prevented. In the vicinity of the LEDs, in order to counter light non-uniformity, reflecting grooves are not disposed and it is a mirror surface, but tight adhesion can be prevented by disposing the projections.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: September 3, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masayoshi Furuyama, Masahiko Kurihara, Yasuhisa Shiraishi
  • Patent number: 8525952
    Abstract: An illumination device includes a light source module, the module comprising: a substrate; a plurality of wiring lines provided on the substrate; and a plurality of LED devices implemented in the wiring lines: wherein the plurality of LED devices include a plurality of red LED devices, a plurality of green LED devices, and a plurality of blue LED devices: wherein the plurality of wiring lines include a wiring line having the plurality of red LED devices implemented in series, a wiring line having the plurality of green LED devices implemented in series, and a wiring line having the plurality of blue LED devices implemented in series; and wherein the plurality of wiring lines are connected in parallel and driven by a single power voltage.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: September 3, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Toshiaki Tanaka, Hiroki Kaneko, Ikuo Hiyama
  • Publication number: 20130222350
    Abstract: There is a need for decreasing a variation in times for writing to TFT elements for pixels in a direction along the extension of a gate line in a liquid crystal display apparatus. A display apparatus includes a display panel having multiple gate lines and drain lines arranged in a matrix and a data driver for outputting a display data signal to each drain line. The data driver includes: an internal control signal generation circuit generating an internal control signal for setting a timing to output a data signal to a drain line of each block on a block basis by dividing the plurality of drain lines into multiple blocks; and a register circuit for recording a setting for division of the block, a setting for delay direction and width of a timing to output the data signal, and a setting for rising and falling of an internal control signal.
    Type: Application
    Filed: March 14, 2013
    Publication date: August 29, 2013
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Hitachi Displays, Ltd.
    Inventors: Yasuhiro TANAKA, Hironobu Isami, Haruhisa Iida, Hidenori Kikuchi, Yukihide Ode
  • Patent number: 8520177
    Abstract: A liquid crystal display device includes a first substrate on which pixels having a thin film transistor are formed in regions surrounded by scanning lines and video signal lines, a second substrate which faces the first substrate and having color filters and light blocking films formed thereon, and a liquid crystal layer which is sandwiched between the first substrate and the second substrate. The thin film transistor has a gate electrode connected to the scanning line, a drain electrode connected to the video signal line and a source electrode connected to a pixel electrode. The pixels include first pixels having a first width and second pixels having a second width smaller than the first width. The pixel electrode of the second pixel has a branch electrode extending from the pixel electrode with at least a portion of the branch electrode overlapping the video signal line or the scanning line.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: August 27, 2013
    Assignees: Hitachi Displays Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masateru Morimoto, Junji Tanno
  • Patent number: 8517591
    Abstract: In a method of forming a thin light guide plate which includes a compression step in an injection molding step, an optical pattern is liable to be adhered to a mold. Further, in removing the light guide plate from the mold using an ejector pin, a stress is concentrated on a local area of the light guide plate thus generating warping, deformation or irregularities in size of the light guide plate. To overcome such drawbacks, a liquid crystal display device is configured such that an optical pattern portion is compressed, and the light guide plate is removed by making use of a peripheral portion of a mold thus preventing the generation of stress in a local area of the light guide plate due to an ejector pin.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: August 27, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hiroshi Nakamoto, Yoshikazu Tanabe, Ken Kagabu
  • Patent number: 8519320
    Abstract: Each optical sensor element includes an upper electrode, a lower electrode, and a light dependent variable resistance element formed of amorphous silicon. Each optical sensor pixel includes: a capacitive element between the lower electrode and a reference voltage line; a first transistor inputting a first power source voltage to a second electrode, connecting a first electrode to the lower electrode, and inputting a second clock to a control electrode; a second transistor inputting a second power source voltage to a second electrode, and connecting a control electrode to the lower electrode; and a third transistor connecting a second electrode to a first electrode of the second transistor, connecting a first electrode to the output line, and inputting a first clock to a control electrode.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: August 27, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Toshio Miyazawa, Hideki Nakagawa, Kozo Yasuda
  • Patent number: 8519969
    Abstract: The present invention provides a display device with a touch panel which gives a user excellent touch feeling. A display device with a touch panel includes: a touch panel which includes a first substrate, a second substrate arranged to face the first substrate in an opposed manner with a gap formed therebetween, a first electrode which is constituted of a plurality of metal lines formed on a surface of the first substrate which faces the second substrate, and a second electrode formed on a surface of the second substrate which faces the first substrate; a display panel which is mounted on the second substrate on a side opposite to the first substrate; and a resin film which is adhered to the first substrate on a side opposite to the second substrate.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: August 27, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takeshi Ookawara, Noriharu Matsudate
  • Patent number: 8514356
    Abstract: In a liquid crystal display device small in the size and having a narrow frame, an alignment film can be coated by ink jet printing, by coating a rapidly drying peripheral alignment film 109 in the shape of a frame to a TFT substrate 100 having a display region having pixel electrode 107 and a peripheral region thereof by ink jet printing, and then coating a display region alignment film 108 drying slower but excellent in the leveling effect by ink jet printing. While the display region alignment film 108 dries slowly, since the peripheral alignment film 109 formed to the periphery functions as a stopper, the shape of the alignment film can be defined accurately, thereby enabling to prevent lowering of the adhesion of the seal member 20 under the effect of the alignment film. This can be applied also on the side of the counter substrate 200.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: August 20, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Tomoyuki Shiromoto, Toshirou Iwata, Rai Yang, Shinichi Soto
  • Patent number: 8512819
    Abstract: Provided is a liquid crystal display device includes: a first substrate (6); a second substrate (7); a liquid crystal layer (LC); a first alignment film (606) placed on the first substrate; a second alignment film (705) placed on the second substrate; and at least one of: a transparent layer (610) contacting the first alignment film on the other side of the liquid crystal layer and being lower in volume resistivity than the first alignment film; and a transparent layer (710) contacting the second alignment film on the other side of the liquid crystal layer and being lower in volume resistivity than the second alignment film, wherein the transparent layer contains polysiloxane expressed by Chemical Formula 1: where R1 and R2 each represent an alkyl group or alkoxy group having 1 to 3 carbon atoms, or a hydroxyl group, and at least 30% of hydroxyl groups are contained.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: August 20, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masaki Matsumori, Yasushi Tomioka
  • Patent number: 8514153
    Abstract: In a display mode, a signal driving circuit (DAC) transmits image signals to the pixels selected by a scanning circuit for display and first switches of switch units. Then, a power supply circuit supplies a current corresponding to the transmitted signal to the pixels. Then, organic EL elements provided in the pixels are driven to emit light, thereby displaying an image. In order to correct the deterioration of the organic EL elements, first, a constant current flows from a current source to the organic EL elements of the pixels selected by a scanning circuit for detection and second switches and a voltage corresponding to the constant current applied to the organic EL element is detected. The detected voltage is input to an AD converter through a buffer amplifier, and the AD converter converts the voltage into a digital value, and transmits the digital value to a signal correction control unit. When the organic EL element deteriorates, the detected digital value varies.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: August 20, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Tohru Kohno, Mitsuhide Miyamoto, Hajime Akimoto, Naruhiko Kasai, Masato Ishii
  • Patent number: 8514348
    Abstract: A light guide plate is for reflecting incident light from an end surface thereof in an inside to obtain surface emission from a front surface thereof. The light guide plate includes protrusions and recesses formed on one of the front surface and a rear surface on an opposite side of the front surface. The protrusions and recesses are formed of a shape in which first mountain-range shapes each including a first ridge continuing along a first direction, which is a direction toward the inside from the end surface, and second mountain-range shapes each including a second ridge continuing along a second direction intersecting with the first direction are combined. Each first mountain-range shape includes a pair of first side surfaces on both sides of the first ridge. Each second mountain-range shape includes a pair of second side surfaces on both sides of the second ridge.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: August 20, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yasuhisa Shiraishi, Atsushi Tsuruoka, Shigeki Nishizawa