Patents Assigned to Hitachi Display, Ltd.
  • Patent number: 8487903
    Abstract: A display device incorporating a touch panel that can be made thinner than a conventional one and requires no countermeasure against misalignment in overlapping is provided by incorporating a touch panel. The display device incorporating a touch panel includes a display panel having a first substrate and a second substrate. The second substrate has a conductive light shielding film formed in a grid pattern on a surface on the opposite side from an observer. The conductive light shielding film is used as a touch panel electrode of electrostatic capacitive coupling system. The conductive light shielding film has a shape with four corners. The corners of the conductive light shielding film are connected to a touch position detection circuit. The display panel has four conductive members.
    Type: Grant
    Filed: March 8, 2010
    Date of Patent: July 16, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kouichi Anno, Shigeyuki Nishitani
  • Patent number: 8487911
    Abstract: An image display apparatus with image entry function capable of high-speed and high-accuracy direct screen entry without increasing the peripheral circuit scale or the number of circuit elements for each pixel that lower the pixel aperture ratio. A first pixel circuit and a second pixel circuit are alternately arrayed horizontally. First and second data lines are connected to a data driver and a sensor signal processor circuit. Selector switches are connected to the input terminal of the data driver. Gray scale voltages are sent from the data driver to the first and second data lines, and first and second photo sensor signals are sent to the sensor signal processor circuit.
    Type: Grant
    Filed: December 18, 2007
    Date of Patent: July 16, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masayoshi Kinoshita, Hiroshi Kageyama
  • Patent number: 8482003
    Abstract: An image display unit is provided for which it is possible to reduce the number of ion plantation and photolithographic processes required to manufacture the device. A gate electrode GT is a laminated structure of a thin bottom layer metal film GMB and a top layer metal film GMT. A top electrode of a storage capacitor Cst is formed of the bottom layer metal film GMB and ion implantation for the top electrode is performed at the same time as the ion implantation of source-drain electrodes. The gate electrode of a PMOSTFT of the device is also formed with the bottom layer metal GMB, and the ion implantation for threshold adjustment is performed by using the same resist.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: July 9, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Mieko Matsumura, Yoshiaki Toyota, Takeshi Sato, Mutsuko Hatano
  • Patent number: 8482513
    Abstract: A liquid crystal display device includes a liquid crystal display panel having first and second scanning lines, first and second video lines, a first scanning line driving circuit, a second scanning line driving circuit, at least one first video line driving circuit, at least one second video line driving circuit, a backlight having a number of light sources, and a light controlling circuit for controlling the turning on and off of the backlight. The first scanning lines are divided into M groups where M is an integer of 2 or more (M?2), the second scanning lines are divided into N groups where N is an integer of 2 or more (N?2), the region of the backlight which corresponds to the first scanning lines is divided into M regions, and the region which corresponds to the second scanning lines is divided into N regions.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: July 9, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Ryutaro Oke, Kikuo Ono, Ikuko Mori, Masashi Baba, Yuya Sato
  • Patent number: 8477086
    Abstract: In an organic EL display, correction is made for a difference in screen luminance between the case of measuring characteristics of OLED elements, and the case of not measuring the characteristics of the OLED elements. A data line for feeding image data items, and a detection line for measuring the characteristics of the OLED elements are connected to respective pixels. Detection of the characteristics of the OLED elements is executed by utilizing a specified period of a frame period. Because an image-displaying period is limited in a frame where measurement of the characteristics of the OLED element 11 is executed, the luminance undergoes deterioration.
    Type: Grant
    Filed: February 7, 2008
    Date of Patent: July 2, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Mitsuhide Miyamoto, Tohru Kohno, Masato Ishii, Naruhiko Kasai, Hajime Akimoto
  • Patent number: 8477150
    Abstract: A display signal conversion apparatus converts a first signal having a first color format and color arrangement into a second signal having a second color format and color arrangement. The display signal conversion apparatus includes a color conversion unit configured to convert the first color format into the second color format, a pattern determination unit configured to determine a signal pattern of the first signal, a unit configured to determine a color arrangement of a pixel position of the second signal corresponding to a pixel position of the first signal, and a sub pixel signal generation unit configured to generate a sub pixel signal having the second color format and color arrangement based on a result of the signal pattern determination and a result of the color arrangement determination.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: July 2, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Tatsuki Inuzuka
  • Patent number: 8477131
    Abstract: A decoder circuit which outputs a voltage based on a 8-bit digital value includes: a first decoder circuit and a second decoder circuit which output one voltage respectively using upper-order 6 bits of the 8-bit digital value; a selection circuit which receives voltages outputted from the first decoder circuit and the second decoder circuit, and distributes the two voltages to three terminals; and an intermediate voltage output circuit which outputs an intermediate voltage which is a one of five kinds of values based on the three voltages. The first decoder circuit and the second decoder circuit respectively include a select-switch-type decoder circuit and a tournament-type decoder circuit. Due to such a constitution, it is possible to reduce a circuit scale of the decoder circuit which outputs the voltage corresponding to the 8-bit digital value.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: July 2, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kenichi Akiyama, Yoshihiro Kotani, Hiroko Sehata, Kouichi Kotera
  • Publication number: 20130162929
    Abstract: A display device includes a first substrate which constitutes a part of a display panel, the first substrate having a first side and having a terminal formed thereon adjacent to the first side, and a flexible printed circuit board which is connected to the first substrate. The flexible printed circuit board includes a board portion, a wiring layer which is mounted on the board portion, a cover portion which covers the wiring layer, and a connecting portion which is connected to the terminal formed on the first substrate. The connecting portion includes a metal layer, and wherein the cover portion overlaps with the first side and an area between the first side and the terminal.
    Type: Application
    Filed: February 15, 2013
    Publication date: June 27, 2013
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Hitachi Displays, Ltd.
    Inventor: Eiji Oohira
  • Publication number: 20130162928
    Abstract: A liquid crystal display device with a pair of substrates which are arranged to face each other with liquid crystal therebetween, columnar spacers having the substantially equal height formed on a liquid-crystal-side surface of one substrate, and the columnar spacers include the columnar spacer which is contact with a liquid-crystal-side surface of another substrate and the columnar spacer which is not contact with the liquid-crystal-side surface of another substrate.
    Type: Application
    Filed: February 20, 2013
    Publication date: June 27, 2013
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Hitachi Displays, Ltd.
    Inventors: Keiichiro ASHIZAWA, Mitsuo NAKATANI, Hiroaki MIWA, Takao TANAKA, Sadafumi HIRAI, Shinichi KAWABE, Makoto SASAKI, Kazuyuki ITO, Masahiro IEDA
  • Patent number: 8471977
    Abstract: A flexible printed circuit board is pulled out to the outside from an end portion of the bottom surface portion. A notch is formed on a tip end of the end portion of the bottom surface portion such that an inner edge of the notch and an outer edge which projects from the notch are contiguously formed. A side of the flexible printed circuit board is arranged so as to overlap the notch. The outer edge of the bottom surface portion which projects overlaps the flexible printed circuit board. An angle made by a straight line which connects an intersecting point between the side of the flexible printed circuit board and the inner edge and a point of inflection between the inner edge and the outer edge and the side of the flexible printed circuit board is set to 45° or less.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: June 25, 2013
    Assignee: Hitachi Displays, Ltd.
    Inventor: Eiji Oohira
  • Patent number: 8466865
    Abstract: The present invention provides a liquid crystal display device which includes a first pixel and a second pixel which are arranged close to each other and are allocated to the same color, and color filters which differ in color tone and are formed on the first pixel and the second pixel, wherein a voltage for driving liquid crystal of the first pixel and a voltage for driving liquid crystal of the second pixel are controlled independently from each other.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: June 18, 2013
    Assignees: Hitachi Displays, Ltd, Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Koichi Igeta, Toshiki Asakura
  • Patent number: 8466862
    Abstract: Provided is a liquid crystal display device, which includes a TFT substrate (230) including: first pixel electrodes (237) which are pixel electrodes at regions corresponding to first filter regions; second pixel electrodes (238) which are pixel electrodes at regions corresponding to second filter regions. The liquid crystal display device has a brightness priority mode, which puts priority on bright screen display, and a response speed priority mode, which puts priority on response of a liquid crystal composition at a time of rewriting of a screen. In the response speed priority mode, a voltage to be applied to the second pixel electrode (238) differs from that in the brightness priority mode. With this, it is possible to realize high transmittance and low power consumption while responding to display of images requiring high response speed.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: June 18, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Kaori Miyazaki
  • Patent number: 8462289
    Abstract: A liquid crystal display panel formed by using a TFT substrate and a color filter substrate is polished to decrease the thickness thereof so that it can be curved. The liquid crystal display panel and various optical sheets are sandwiched between a frame forming a curved surface and a light guide plate forming a curved surface, to thereby form a curved surface. An upper polarizer plate and a lower polarizer plate are, respectively, sandwiched between the surface cover and the liquid crystal display panel, and between the liquid crystal display panel and the optical sheet, and are not adhered or are partly adhered to the liquid crystal display panel.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: June 11, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Shigeki Nishizawa, Nobuyuki Koganezawa, Fuimiyuki Sato
  • Patent number: 8462303
    Abstract: A liquid crystal display device includes liquid crystals which are sandwiched between a first substrate and a second substrate, wherein on the first substrate is provided, a thin-film transistor, a drain electrode line to which a video signal is applied, a gate electrode line to which a gate signal is applied, a pixel electrode and a common electrode consisting of transparent conductive films, a first insulating layer formed between the pixel electrode and the common electrode, a and second insulating layer formed between the common electrode and the first substrate, wherein on the second substrate is provided, a color filter which includes a plurality of coloring layers of different colors, the coloring layers having different light transmittances, wherein a common line consisting of a metal to which a common voltage is applied, the common line being formed between the first substrate and the second insulating layer.
    Type: Grant
    Filed: September 6, 2012
    Date of Patent: June 11, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd
    Inventor: Kikuo Ono
  • Patent number: 8462309
    Abstract: A liquid crystal display device and a manufacturing method thereof which can suppress chipping of an alignment film or the like are provided. A liquid crystal display device and a manufacturing method thereof which can obviate the complication of manufacturing steps and the increase of a manufacturing cost are also provided. A liquid crystal display device includes: a TFT substrate; a counter substrate; and liquid crystal sandwiched between the TFT substrate and the counter substrate. A plurality of color filters are arranged on the counter substrate, and spacers are formed by stacking the plurality of color filters and by covering a surface of stacked color filters with an overcoat layer. Pedestals are formed on the TFT substrate in a state where the pedestal faces the spacer in an opposed manner. The pedestal is formed by stacking at least a semiconductor layer and a metal layer formed which are simultaneously with a thin film transistor on the TFT substrate.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: June 11, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yasuko Gotoh, Kazuhiko Koyahara
  • Patent number: 8456405
    Abstract: A liquid crystal display device and driving method therefor are disclosed. The device includes a plurality of signal lines that apply different gray scale voltages to each of the pixels. A driving circuit is provided to generate the gray scale voltages to be applied to the pixels. In operation, the driving circuit applies the first gray scale voltage at intervals of the horizontal scanning time within a display period. The second gray scale voltage is output by a number of times that is not smaller than twice and not greater than (M-N) times at intervals of the horizontal scanning time from the beginning of the vertical retrace interval. The second gray scale voltage is then stopped until completion of the vertical retrace interval.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: June 4, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Tomohide Oohira
  • Patent number: 8456591
    Abstract: A liquid crystal display device includes a liquid crystal display panel, and a backlight which is arranged on a back surface of the liquid crystal display panel, wherein the backlight includes a plurality of optical sheets, and at least one optical sheet is displaced so as to adjust a viewing angle.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: June 4, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Tetsuya Oshima, Hirotaka Imayama, Yasuhisa Shiraishi, Yoshiharu Nagae
  • Patent number: 8456200
    Abstract: Provided is a gate signal line driving circuit including: 2n clock signal lines where 2n-phase clock signals are input in the normal order of the sequence in normal-directional scanning and in the inverse order of the sequence in inverse-directional scanning, respectively; and a plurality of basic circuits, each being connected with the 2n clock signal lines and outputting a gate signal from an output terminal, in which each of the basic circuits includes a high-voltage applying switching circuit where one clock signal line is connected to an input side and applies a voltage applied to the clock signal line to the output terminal and an off-signal applying switching circuit that applies an off-voltage to a switch of the high-voltage applying switching circuit, and a clock signal line where a clock signal having an inverse phase is connected to a switch of the off-signal applying switching circuit.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: June 4, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hideo Sato, Masahiro Maki, Hiroyuki Abe
  • Patent number: 8456401
    Abstract: The gate electrode is formed above the polycrystalline semiconductor layer through the gate insulating film. The polycrystalline semiconductor layer includes a first region overlapping with the gate electrode in plan view. The first region is sandwiched between the second region and the third region. The second region of the polycrystalline semiconductor layer includes a first impurity diffusion region and two second impurity diffusion regions opposite in conductivity type to the first impurity diffusion region. The first region and the first impurity diffusion region are in contact with each other at a first boundary. The first region and the two second impurity diffusion regions are in contact with each other at second boundaries. The two second impurity diffusion regions sandwiching the first impurity diffusion region are provided along the gate electrode. Thus, a leak current is suppressed.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: June 4, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Katsumi Matsumoto, Kozo Yasuda, Yasukazu Kimura, Takuo Kaitoh, Toshihiko Itoga, Hiroshi Kageyama
  • Patent number: RE44314
    Abstract: In spite of an increase in the size of a liquid crystal display panel, it is possible to prevent the defective connection of a flexible wiring board to a transparent substrate of the liquid crystal display panel. A liquid crystal display device includes a pair of transparent substrates arranged to oppose each other across a liquid crystal, for which they are utilized to form a chamber, a plurality of pixels formed along a spreading direction of the liquid crystal, driving circuits for supplying video signals to the pixels, and a flexible wiring board for supplying signals to the input sides of the driving circuits from a substrate on which a control circuit is mounted, the flexible wiring board being divided into a plurality of portions.
    Type: Grant
    Filed: June 14, 2010
    Date of Patent: June 25, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yasuyuki Mishima, Shunsuke Morishita