Patents Assigned to Hitachi Displays, Ltd.
  • Patent number: 8330915
    Abstract: A liquid crystal display device capable of preventing the occurrence of crack in a capacitor insulating film due to laser marking is provided.
    Type: Grant
    Filed: September 21, 2009
    Date of Patent: December 11, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Co., Ltd.
    Inventors: Hiroyuki Abe, Daisuke Mutou, Takamitsu Kamada
  • Patent number: 8325295
    Abstract: A liquid crystal display device includes a liquid crystal display panel, a plurality of groups of light source units, a plurality of light guide plates, and a light source control circuit configured to control light amounts of the light source units. The plurality of light guide plates are configured to transmit light from the plurality of groups of the light source units. In each of the plurality of light guide plates, areas from which the transmitted light exiting toward the liquid crystal display panel differ from one another. One of the plurality of groups of the light source units paired with one of the plurality of light guide plates includes at least two light source units that are controlled in light amount independently. A number of the areas of the one of the plurality of light guide plates is at least a number of the light source units thereof.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: December 4, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Tatsuya Sugita, Masaya Adachi, Shinichiro Oka
  • Patent number: 8325284
    Abstract: The manufacturing method of a liquid crystal display device includes a step of forming the scanning signal lines including a step in which a photosensitive material film is exposed using an exposure device having a spatial light modulating element which generates an exposure pattern by a numerical control based on drawing data prepared based on the layout data. The drawing data is prepared by correction such that a shape of a portion of the scanning signal line in the layout data which is overlapped to a source electrode has an area corresponding to the distribution of a film thickness of an insulation layer interposed between the scanning signal line and the source electrode.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: December 4, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takahiro Miyazaki, Jun Ooida
  • Patent number: 8325299
    Abstract: The present invention provides a manufacturing method for a liquid crystal display device, wherein the liquid crystal display device comprises first and second color filters provided on the liquid crystal side of one of a pair of substrates which are positioned so as to face each other and sandwich liquid crystal in between so as to be adjacent to each other, and a first side portion of the first color filter on the second color filter side overlaps with a second side portion of the second color filter on the first color filter side, characterized in that the border between the light blocking region and the non-light blocking region in a photomask for forming the first color filter, which corresponds to the first side portion, has a zigzag pattern with repeating mountains and valleys along this border, and the border between the light blocking region and the non-light blocking region in a photomask for forming the second color filter, which corresponds to the second side portion, has a zigzag pattern with rep
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: December 4, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Toshimasa Ishigaki, Yasukazu Kimura, Jun Fujiyoshi
  • Publication number: 20120299028
    Abstract: A LCD device having a large pixel holding capacitance includes opposedly facing first and second substrates, and liquid crystal between them. The first substrate includes a video signal line, a pixel electrode, a thin film transistor having a first electrode connected to the video signal line and a second electrode connected to the pixel electrode, a first silicon nitride film formed above the second electrode, an organic insulation film above the first silicon nitride film, a capacitance electrode above the organic insulation film, and a second silicon nitride film above the capacitance electrode and below the pixel electrode. A contact hole etched in both the first and second silicon nitride films connects the second electrode and the pixel electrode to each other. A holding capacitance is formed by the pixel electrode, the second silicon nitride film and the capacitance electrode.
    Type: Application
    Filed: August 7, 2012
    Publication date: November 29, 2012
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Hitachi Displays, Ltd.
    Inventors: Hideo TANABE, Masaru Takabatake, Toshiki Kaneko, Atsushi Hasegawa, Hiroko Sehata
  • Patent number: 8318527
    Abstract: Disclosed is a manufacturing method of a liquid crystal display device where first color filters, second color filters and third color filters which are formed adjacent to each other are provided, the first color filter and the second color filter are patterned in such a manner that one edge portion of the second color filter overlaps an edge portion of the first color filter, and the second color filter and the third color filter are patterned in such a manner that an edge portion of the third color filter overlaps the other edge portion of the second color filter wherein in an exposure step for patterning the second color filter, an exposure quantity in a region corresponding to one edge portion and an exposure quantity in a region corresponding to the other edge portion differ from each other.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: November 27, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Jun Fujiyoshi, Yasukazu Kimura, Hideo Tanabe
  • Patent number: 8319225
    Abstract: A display device includes: a conductive layer on which gate electrodes are formed; a first insulation layer which is formed on the conductive layer; a semiconductor layer which is formed on the first insulation layer and is provided for forming semiconductor films which contain poly-crystalline silicon above the gate electrodes; and a second insulation layer which is formed on the semiconductor layer. Here, the semiconductor film includes a channel region which overlaps with the gate electrode as viewed in a plan view. In the channel region, a portion of the semiconductor film which is in contact with the second insulation layer exhibits higher impurity concentration than a portion of the semiconductor film which is in contact with the first insulation layer.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: November 27, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takahiro Kamo, Takeshi Noda
  • Patent number: 8319909
    Abstract: A liquid crystal display (LCD) device employs a lower polarization plate structure thinner than conventional devices. The device comprises: a LCD panel including first and second substrates, and liquid crystal between the first and second substrates; and a backlight on the first substrate side of the panel. The backlight includes a frame-like mold frame and an optical sheet inside the mold frame. The LCD panel is adhered to the mold frame by double-sided tape, and includes a lower polarization plate on the first substrate's surface. The double-sided tape is adhered to a peripheral portion of the first substrate on one side, and to the mold frame and a peripheral portion of the optical sheet on the other. Where A is the thickness of the double-sided tape and B the thickness of the lower polarization plate, A>B. The difference A?B satisfies 0<A?B<50 ?m.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: November 27, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Eiji Oohira
  • Patent number: 8319709
    Abstract: A display device of the invention includes a display panel attached to one face side of a light transmissive circuit board and a light transmissive substrate attached to the other face side of the circuit board. A mounted component is mounted on the other face side of the circuit board. The circuit board includes a light transmissive junction layer for joining the circuit board to the light transmissive substrate at a position avoiding the mounted component. The junction layer includes a core substrate formed of a resin, an adhesive layer formed on one face of the core substrate, and a bonding layer formed on the other face of the core substrate and cured. The adhesive layer is adhered to the circuit board, and the bonding layer is firmly fixed to the light transmissive substrate.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: November 27, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hiroshi Ito, Kazunori Ojima, Hideaki Abe, Shinji Tanabe, Masayuki Yanagihara
  • Patent number: 8313806
    Abstract: Provided is a method for moving, in a vacuum chamber carrying therein a fixedly-provided evaporation source, a substrate toward the evaporation source together with a mask closely attached to the substrate surface, and onto the surface substrate, evaporating a material vaporized in the evaporation source through an aperture formed to the mask. In this method of the invention, means for moving the substrate toward the evaporation source is provided with cooling means not to come in contact with but to be in proximity to a surface of the mask on the evaporation source side, and a cooling plate formed with an aperture proximal to the evaporation source is disposed. With such a configuration, the steam of the material coming from the evaporation source is directed to the mask and the substrate through the aperture of the cooling plate.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: November 20, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Display Co., Ltd.
    Inventor: Hiroyasu Matsuura
  • Patent number: 8314761
    Abstract: A processing portion for conversion from RGB to RGBW includes a W generating circuit, a sub-pixel rendering circuit, a W intensity calculating portion which transmits a W intensity setting value to a W generating circuit, and a low power backlight control circuit which expands data on the basis of the RGBW pixels generated by the sub-pixel rendering portion and lowers the backlight in accordance with the amount by which the data is expanded. The inputted RGB data is used as the RGBW data with the W intensity calculated by the W intensity calculating portion. A backlight control signal is generated based on the amount of data expansion in the sub-pixel rendering portion. Deterioration (darkness) of image quality due to a reduction in the brightness of a single color as a result of the conversion from RGB pixels to RGBW pixels is prevented and a reduction in the power is achieved.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: November 20, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Naoki Takada, Yasuyuki Kudo, Yoshiki Kurokawa, Norio Mamba, Shinichi Komura
  • Publication number: 20120287029
    Abstract: A display device comprises a driver circuit having a shift register circuit having a level conversion function is provided with a simple circuit configuration of first, second, and third basic circuits connected in tandem at multistages. A common clear signal is supplied to a control electrode of a third transistor of each basic circuit, a first clock is supplied to a control electrode of a first transistor of each of the first and third basic circuits, a second clock different in phase from the first clock is supplied to a control electrode of a first transistor of the second basic circuit, outputs of the first and second basic circuit are respectively supplied to control electrodes of second transistors of the second and third basic circuits, and an inversion output of the third basic circuit is supplied to a control electrode of a fourth transistor of the first basic circuit.
    Type: Application
    Filed: July 24, 2012
    Publication date: November 15, 2012
    Applicants: Panasonic Liquid Crystal Displays Co., Ltd., Hitachi Displays, Ltd.
    Inventors: Hideo SATO, Shigeyuki NISHITANI, Takayuki NAKAO, Masahiro MAKI
  • Patent number: 8310460
    Abstract: A display device with a touch panel includes a display panel, and an electrostatic-capacitance-coupling touch panel which is arranged on a viewer-side surface of the display panel. The touch panel includes a substrate; a first shield conductor which is formed on the viewer-side surface of the substrate; an insulation film which is formed on the first shield conductor; a plurality of first electrodes which are formed on the insulation film, extend in the first direction and are arranged parallel to each other in the second direction which intersects with the first direction; and a plurality of second electrodes which are formed on the insulation film, extend in the second direction and are arranged parallel to each other in the first direction which intersects with the second direction. A predetermined signal is inputted to the first shield conductor.
    Type: Grant
    Filed: January 7, 2010
    Date of Patent: November 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Satoshi Saitou
  • Patent number: 8310641
    Abstract: Image display device having an electrode forming layer which includes a plurality of gate lines, a plurality of drain lines, a plurality of switching elements and the a plurality of pixel electrodes, and having reference electrode layer between the electrode forming layer and a substrate where the electrode forming layer formed thereon, and the reference electrode layer and the electrode forming layer are insulated by insulating layer.
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: November 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yoshiaki Nakayoshi, Kazuhiko Yanagawa
  • Patent number: 8310617
    Abstract: A liquid crystal display device includes: a liquid crystal display panel having a liquid crystal layer disposed between substrates facing each other; and a supporting frame holding the liquid crystal display panel and capable of being attached to backlight means, wherein an optical sheet disposed on the backlight means side of the liquid crystal display panel is provided, the supporting frame includes an upper frame, a mold frame, and a lower frame, the upper frame and the mold frame sandwiching the liquid crystal display panel therebetween, the mold frame and the lower frame sandwiching the optical sheet therebetween, and first fixing means (including a screw) for fixedly coupling the upper frame, the mold frame, and the lower frame with one another and second fixing means (including a screw) for fixedly coupling only the lower frame with the backlight means are separately disposed.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: November 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Shinji Shimizu
  • Patent number: 8310634
    Abstract: A liquid crystal display device includes first and second substrates with first and second polarizing layers, a liquid-crystal layer, a matrix-driven electrode group; and a rear-illuminating device. Between the first polarizing layer and the liquid-crystal layer, a first optical compensating member is disposed without a birefringent medium sandwiched between the liquid-crystal layer and the first optical compensating member, and the first optical compensating member is constructed so that when a refractive index thereof in a slow-axis direction in a plane parallel to the substrate is taken as n1, a refractive index in a fast-axis direction in the plane parallel to the substrate is taken as n2, and a refractive index in a thickness direction is taken as n3, the first optical compensating member satisfies n1?n3>n2, and a slow axis thereof in the plane parallel to the substrate is substantially vertical to an optical axis of the liquid-crystal layer.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: November 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kentaro Ojima, Daisuke Kajita, Ikuo Hiyama, Masahiro Ishii
  • Patent number: 8310611
    Abstract: Provided is a display device including: a gate electrode (GT); a semiconductor film (S) which controls a current flowing between a source electrode (ST) and a drain electrode (DT), the semiconductor film including a channel region and two impurity regions formed of regions which sandwich the channel region; two Ohmic contact layers (DS) being interposed between the source electrode and the like and the two impurity regions; and an insulating film laminated on a partial region of the semiconductor film, the partial region being around a position corresponding to a substantial center of the semiconductor film, in which: the semiconductor film is formed of one of microcrystalline-silicon and polycrystalline-silicon; the two impurity regions are formed in regions on which the insulating film is absent; the two Ohmic contact layers cover the two impurity regions therewith; and the source electrode and the like cover the Ohmic contact layers therewith.
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: November 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takuo Kaitoh, Toshio Miyazawa, Takeshi Sakai
  • Patent number: 8310639
    Abstract: A display device with a plurality of gate signal lines extended in the first direction; a plurality of drain signal lines extended in the second direction; a plurality of pixel regions in a state that each pixel region includes a switching device, a pixel electrode which is connected with the drain signal line and a counter electrode. The counter electrode is formed with respect to the pixel electrode by way of an insulation film and is formed every pixel. The pixels include first pixels and second pixels, wherein only the first pixels have a counter voltage signal line which extends in the first direction, and the counter voltage signal line is connected with the counter electrodes in the first pixels. Further, the counter electrodes of the first pixels and the counter electrodes of the second pixels are electrically connected with each other using conductive stride over the gate signal line.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: November 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Akira Matsuoka, Kikuo Ono
  • Patent number: 8309960
    Abstract: A display device includes a plurality of thin-film transistors formed on a substrate on which a display area is formed. At least one of the plurality of thin-film transistors includes a gate electrode, agate insulating film formed to cover the gate electrode, an interlayer insulating film formed on an upper surface of the gate insulating film and having an opening formed in an area where the gate electrode is formed in plan view, a pair of heavily-doped semiconductor films arranged on an upper surface of the interlayer insulating film with the opening interposed therebetween, a polycrystalline semiconductor film formed across the opening and formed in the area, the polycrystalline semiconductor film being electrically connected to the pair of heavily-doped semiconductor films, and a pair of electrodes formed to overlap the pair of heavily-doped semiconductor films, respectively, without overlapping the polycrystalline semiconductor film.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: November 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yoshiaki Toyota, Mieko Matsumura, Masatoshi Wakagi
  • Patent number: 8310614
    Abstract: A liquid crystal display device preventing a liquid crystal display panel from damage by bending of a light-transmissive substrate and capable of curving a display surface of the panel is provided. The liquid crystal display device comprising: a liquid crystal display panel having a liquid crystal layer sealed between a pair of light-transmissive substrates having pixel formation electrodes on inner surfaces thereof, and formed by assembling positive and negative curved surfaces with respect to one direction; a backlight mounted on a rear surface of the panel along a curved shape of the panel and having at least one light emission device irradiating illumination light toward the rear surface; and a resin member held in a space between peripheral portions where the panel is opposed to the backlight, and fixing and holding a curved state, is provided. Distortion of the light transmissive glass substrates by bending of the panel is eased.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: November 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Susumu Sasaki, Hitoshi Azuma, Takao Ebine, Tomio Yaguchi, Shoichi Uchino, Akiko Iwata