Patents Assigned to Hitachi Displays, Ltd.
  • Patent number: 9208720
    Abstract: An organic EL displaying apparatus which suppresses a defective display caused by a leak current at a time when an emission period controlling transistor is off is provided. The organic EL displaying apparatus comprises a plurality of pixels each of which includes an organic EL element, a power supply line, a driving transistor and the emission period controlling transistor, a data line, and a control line. In this apparatus, in a certain one of the pixels, a resistance Roff—ILM between source and drain electrodes of the emission period controlling transistor in an off state of the emission period controlling transistor, and a resistance Rbk—Dr between source and drain electrodes of the driving transistor in a state that a minimum gradation displaying data voltage has been applied to a gate electrode of the driving transistor satisfy Roff—ILM?Rbk—Dr.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: December 8, 2015
    Assignees: Canon Kabushiki Kaisha, Hitachi Displays, Ltd.
    Inventors: Junya Tamaki, Nobuhiko Sato, Masami Iseki, Kouji Ikeda, Masahiro Tamura, Takeshi Izumida, Naoki Tokuda
  • Patent number: 8717510
    Abstract: A liquid crystal display device intended for increasing the ON-current of a TFT in the pixel while suppressing variation of the ON-current, in which a semiconductor layer and a first n+-a-Si layer in the TFT are formed continuously by plasma CVD. The semiconductor layer and the first n+-a-Si layer are patterned simultaneously. Then, a second n+-a-Si layer is formed so as to cover the upper surface of the first n+-a-Si layer and the side portion of the semiconductor layer. The ON-current can be increased and variation of the ON-current of the TFT can be decreased by forming the first n+-a-Si layer continuously over the semiconductor layer.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: May 6, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hidekazu Nitta, Hidekazu Miyake, Takuo Kaitoh
  • Patent number: 8665192
    Abstract: A display device having pixels disposed in a matrix and a pixel row in which a first pixel, a second pixel, a third pixel, and a fourth pixel are disposed in one direction, includes: a gate signal line having a first gate signal line to which the first pixel and the third pixel are connected and a second gate signal line to which the second pixel and the fourth pixel are connected; a drain signal line supplying a video signal to two pixel columns; and a storage line including a first storage line and a second storage line disposed so as to interpose the pixel row therebetween, wherein the first storage line and the second storage line are electrically connected to each other in a region where the drain signal line is not disposed, and a pixel electrode of each of the pixels has a portion overlapping with the drain signal line and a portion overlapping with the storage line.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: March 4, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Osamu Nagashima, Takahiro Nagami
  • Patent number: 8654069
    Abstract: In a display device, pixel electrodes I, II and III corresponding to color filters R, G and B are coupled to TFTs which are turned on in accordance with signals on gate lines G, and the drain (source) of the TFT coupled to the pixel electrode II is connected with the source (drain) of the TFT coupled to the pixel electrode III. A signal voltage is written in the pixel electrode I when the gate line G1a is in the “on” state, a signal voltage is written in the pixel electrode II when the gate line G1b is in the “on” state, and a signal voltage is written in the pixel electrode III when the gate lines G1a and G1b are both in the “on” state. Signal voltages are written in the pixel electrodes III, I and II in this order mentioned.
    Type: Grant
    Filed: February 6, 2008
    Date of Patent: February 18, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Norio Mamba, Tsutomu Furuhashi, Shinichi Komura
  • Patent number: 8652766
    Abstract: An organic passivation film having a high transmittance and capable of setting a taper angle of a through hole within a predetermined range in a liquid crystal display device. A pixel electrode and a source electrode of a TFT are connected by way of a through hole formed in an organic passivation film. The organic passivation film having high productivity, high transmittance, and a predetermined taper angle ? of a through hole can be formed by using a chemical amplification photosensitive resin composition comprising, as a base material, an acrylic resin having a molecular weight of 4,000 to 20,000 and containing 1 to 6 wt % of a photoacid generator as the material for the organic passivation film, performing exposure and development for forming a through hole, and then performing post exposure, prebaking, and baking under appropriate conditions.
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: February 18, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Toshimasa Ishigaki, Fumio Takahashi, Toshiki Kaneko
  • Publication number: 20140043551
    Abstract: In the step of curing a resin for bonding a TFT substrate and a counter substrate each having an alignment film that has been optically aligned by using UV-light, damage to the alignment film due to the UV-light can be prevented without using a light shielding mask. A UV-light absorption layer is formed between each black matrix on the counter substrate. The TFT and counter substrates are sealed at their periphery by a resin that is cured by UV-light radiated from the counter substrate side. Since the absorption layer has a high absorbability to UV-light at a wavelength of 300 nm or less that degrades the alignment film, damage to the alignment film due to the UV-light for curing the resin can be prevented. Thus, provision of a light shielding mask for shielding the UV-light for the display region can be saved.
    Type: Application
    Filed: October 22, 2013
    Publication date: February 13, 2014
    Applicant: HITACHI DISPLAYS, LTD.
    Inventors: Noboru KUNIMATSU, Yuko MATSUMOTO, Yasushi TOMIOKA, Masateru MORIMOTO, Atsuhiro KATAYAMA
  • Patent number: 8648988
    Abstract: This invention enables forming a photo-alignment film having a large LC anchoring strength in an IPS type liquid crystal display device. An alignment film is adapted to have a two-layer structure including a photo-alignment film and an alignment film with enhanced film strength. The photo-alignment film is formed of a precursor of polyamide acid ester, 80 percent or more of which is polyamide acid ester including cyclobutane. The alignment film with enhanced film strength is formed of a precursor of polyamide acid. After irradiating the substrate with ultraviolet light for photo-alignment, the substrate is heated. Thus, it is possible to achieve a high LC anchoring strength of the alignment film as the whole for photo-alignment, without degrading the mechanical strength of the alignment film with enhanced film strength.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: February 11, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Noboru Kunimatsu, Chikae Matsui, Hidehiro Sonoda, Yuko Matsumoto, Shoichi Uchino, Masaki Matsumori, Yasushi Tomioka
  • Patent number: 8633882
    Abstract: A semiconductor integrated circuit including a first register which latches display data, a second register which latches the display data of the first register in accordance with a first clock, a gray scale voltage generator which outputs a plurality of gray scale voltages, a decoder which selects a gray scale voltage in accordance with the display data of the second register from the plurality of gray scale voltages, and an amplifier including a first transistor and a second transistor. A first terminal of the first transistor and a first terminal of the second transistor are connected to a first voltage line, and the gray scale voltage outputted from the decoder is supplied to one of input terminals of the first transistor and the second transistor in accordance with a control signal. A phase of the control signal is reversed at intervals of two horizontal scanning lines.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: January 21, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Mitsuru Goto, Hiroshi Katayanagi, Yukihide Ode, Yoshiyuki Saitou, Koichi Kotera
  • Patent number: 8634049
    Abstract: A liquid crystal display device includes a TFT substrate having a display region which has first and second electrodes, a plurality of TFTs and a plurality of scanning signal lines connected to the plurality of TFTs, a counter substrate, a liquid crystal layer sandwiched between the TFT and counter substrates, and sealed by a sealant, a plurality of scanning line leads connected to the plurality of scanning signal lines formed in a region outside of the display region, and a shield electrode formed on the TFT substrate covering the plurality of scanning line leads. The second electrode is connected to one of the plurality of TFTs, and liquid crystal molecules of the liquid crystal layer are driven by an electric field, which is generated between the first and second electrodes. The shield electrode is electrically connected to the first electrode and overlapped with the sealant in plan view.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: January 21, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kenji Anjo, Takahiro Nagami, Kenichi Hatakeyama
  • Publication number: 20140015795
    Abstract: A static capacitance type touch panel, a control unit electrically connected with X and Y electrodes for detecting a touch position based on a measured value of a static capacitance between the X and Y electrodes. The control unit includes a predetermined touch threshold for detecting a peak, a near-peak range and a non-near-peak range, a first parameter for determining a value of the near peak range, and a second parameter for determining a value of the non-near-peak range. The first and second parameters are respectively predetermined for reduction of a noise influence from the measured value of the static capacitance between the X electrode and the Y electrode.
    Type: Application
    Filed: September 13, 2013
    Publication date: January 16, 2014
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Hitachi Displays, Ltd.
    Inventors: Koji DOI, Norio MAMBA, Koji NAGATA, Toshiyuki KUMAGAI, Koji HAYAKAWA, Toshiaki ATSUKA
  • Patent number: 8629965
    Abstract: First terminals and second terminals, which are terminals of adjacent terminal wires, are staggered in the direction in which wires run, and transparent conductive films provided to the first terminals and second terminals extend so as to overlap the terminal wires outside the regions in which contact holes are created and are formed so as to have a width narrower than the width of the terminal wires in the regions where contact holes are created.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: January 14, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Syou Yanagisawa
  • Publication number: 20140009715
    Abstract: In a liquid crystal display which includes a liquid crystal layer between a TFT substrate and a counter substrate, a gate electrode, a gate insulator and a semiconductor layer are laminated. A pixel electrode is formed on the gate insulator and metal source and drain electrodes are formed on the semiconductor layer and gate insulator. At least upper surfaces of the source and drain electrode contain Mo. One of the source and drain electrodes is directly laminated on a portion of the pixel electrode, which portion is disposed on the gate insulating film.
    Type: Application
    Filed: September 10, 2013
    Publication date: January 9, 2014
    Applicants: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD., HITACHI DISPLAYS, LTD.
    Inventors: Kenji ANJO, Tomohiko OOTANI
  • Patent number: 8625059
    Abstract: In a screen configuration in which pixels are in a delta arrangement, video signal lines are formed on every other pixel, and two scanning lines in one set are disposed, transmittance of the screen is improved. Pixels corresponding to a red pixel (R), a green pixel (G), and a blue pixel (B) are disposed in a delta arrangement in a TFT substrate. A red color filter, a green color filter, a blue color filter are formed, in a counter substrate, corresponding to the red pixel (R), the green pixel (G), and the blue pixel (B) of the TFT substrate. A black matrix is formed to a portion where the color filter is not present. Two blue color filters are formed continuously adjacent each other in the first direction, and a black matrix is not formed between the blue color filters adjacent each other.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: January 7, 2014
    Assignee: Hitachi Displays, Ltd.
    Inventor: Takahiro Nagami
  • Patent number: 8624830
    Abstract: Provided is a display device (1), including: two pixels in a region (A) surrounded by two video signal lines (DL) and two scanning signal lines (GL); a first dummy wiring, which is connected to one video signal line of the two video signal lines; and a second dummy wiring, which is connected to a different one of the two video signal lines (DL) from the one video signal line to which the first dummy wiring is connected, in which the first dummy wiring and the second dummy wiring each extend along a contour of the region (A) to a position between the two pixels, and further extend so that respective end portions are opposed to each other between the two pixels.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: January 7, 2014
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takao Sato, Takeshi Sato
  • Patent number: 8614659
    Abstract: A display device for use in compact portable devices is configured for assigning gray levels according to the pixel area ratio and, further includes a digital-to-analog (D-A) conversion circuit for converting digital data to gray-level voltage or analog signals. This configuration reduces the size of the circuit for D-A conversion, thus reducing the space for the driving circuit when assigning gray levels according to the pixel area ratio. The combination of the gray-level voltage output from the driving circuit and the gray-level assignment according to the pixel area ratio reduces the scale of the circuit.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: December 24, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Toshio Miyazawa
  • Patent number: 8610868
    Abstract: In order to prevent dielectric breakdown of TFT or an interlayer insulating film by static electricity with a reduced area at low cost, a liquid crystal display device has a configuration in which an interlayer insulating film and an a-Si film are formed in a display area and a control area inside terminals. Image signal lines and scan lines are insulated from each other through the interlayer insulating film and a-Si film in their intersections. On the other hand, only the interlayer insulating film is formed between static electricity protection lines and an earth line outside the terminals. When static electricity is induced, dielectric breakdown is caused to occur in the area outside the terminals. Thus, the display area and the control area are protected from the static electricity.
    Type: Grant
    Filed: March 8, 2011
    Date of Patent: December 17, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Terunori Saitou, Hidekazu Miyake, Takuo Kaitoh, Yoshiharu Owaku
  • Patent number: 8610837
    Abstract: Disclosed is a display device in which reliable bonding strength and high reparability are compatible when a panel-like member is bonded to a display panel. The display device comprises: a display panel; and a panel-like member bonded to the display panel with an adhesive made of an ultraviolet curable resin; wherein the adhesive includes a first adhesive portion and a second adhesive portion, the first adhesive portion being provided outside of a display area of the display panel and formed in a circular shape to surround the display area, the second adhesive portion prevailing in an area surrounded by the first adhesive portion, the first adhesive portion being different in a modulus of elasticity from the second adhesive portion, and wherein the modulus of elasticity of the second adhesive portion is smaller than the modulus of elasticity of the first adhesive portion.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: December 17, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Setsuo Kobayashi, Akira Ishii, Masanori Katsuyama, Shinji Tanabe, Kiyoshi Sento
  • Patent number: 8605045
    Abstract: Provided is a capacitive touch panel, including: a plurality of coordinate detection electrodes (XP1, XP2, YP2) for detecting X-Y position coordinates; a first substrate (1) including the plurality of coordinate detection electrodes; and a second substrate (6) disposed to be opposed to the first substrate, in which: one of the first substrate and the second substrate includes an elastic layer lower (5) in rigidity than the second substrate and a conductive layer (ZP) having conductivity; the elastic layer and the conductive layer are disposed between the plurality of coordinate detection electrodes and the second substrate; a space between the first substrate and the second substrate defined by a plurality of nonconductive spacers (4); and an antireflective layer is formed on at least one of an interface between the space and the first substrate and an interface between the space and the second substrate.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: December 10, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Norio Mamba, Koji Nagata, Shinji Sekiguchi, Koji Hayakawa
  • Patent number: 8605069
    Abstract: An image display device includes switches directly connected a constant current source to a self-luminous element to be able to detect a characteristic of the self-luminous element, generate a coordinates and convert information of the characteristic and coordinates into a system communication signal, transferring an input with a temperature variation to a system side.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: December 10, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Naruhiko Kasai, Masato Ishii, Mitsuhide Miyamoto, Tohru Kohno, Hajime Akimoto
  • Patent number: 8599352
    Abstract: A liquid crystal display device and method includes a pair of substrates with liquid crystal sandwiched therebetween, a plurality of intersecting scanning signal lines and image signal lines, a thin film transistor formed corresponding to each intersection, a pixel electrode which is formed in a pixel region and connected to the thin film transistor, a gate insulating film, and a protective insulating film. At least one of the scanning signal lines and the image signal lines are each formed of a laminated film including a first layer and a second layer, wherein the first layer is formed of a copper film having a purity of at least 99.5%, and the second layer is formed of an alloy film containing copper as a main component. The first layer and the second layer are collectively subjected to wet etching with an etchant having a predetermined pH.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: December 3, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takaaki Suzuki, Takuya Takahashi