Patents Assigned to NEC LCD Technologies, Ltd.
  • Publication number: 20080035920
    Abstract: A thin-film transistor array includes an electrically insulating substrate, a plurality of thin-film transistors arranged in a matrix on the substrate, and each including a channel, a source, and a drain each comprised of an oxide-semiconductor film, a pixel electrode integrally formed with the drain, a source signal line through which a source signal is transmitted to a group of thin-film transistors, a gate signal line through which a gate signal is transmitted to a group of thin-film transistors, a source terminal formed at an end of the source signal line, and a gate terminal formed at an end of the gate signal line. The source terminal and the gate terminal are formed in the same layer as a layer in which the channel is formed. The source terminal and the gate terminal have the same electric conductivity as that of the pixel electrode.
    Type: Application
    Filed: August 7, 2007
    Publication date: February 14, 2008
    Applicants: NEC Corporation, NEC LCD Technologies, Ltd.
    Inventors: Kazushige Takechi, Mitsuru Nakata
  • Publication number: 20080036937
    Abstract: A liquid crystal display device includes a liquid crystal display panel, a case in which the liquid crystal display panel is mounted, and which is comprised of a front case disposed at the front, and a rear case disposed at the rear, and an electrical conductor through which the front case is electrically conducted with the liquid crystal display panel. The electrical conductor is mounted on an inner surface of the front wall of the front case. The front case is formed with at least one slit such that deformation caused in a second area of the sidewall of the front case in which a connector for connecting to the rear case is formed, when the front case and the rear case are assembled to each other, does not extend to a first area in which the electrical connector is fixed to the front case.
    Type: Application
    Filed: July 24, 2007
    Publication date: February 14, 2008
    Applicant: NEC LCD Technologies, Ltd
    Inventor: Takehiro FUKUWAKI
  • Patent number: 7327419
    Abstract: A color filter substrate in an active-matrix LCD device has a glass substrate, and a black matrix, coloring layers and an orientation film which are consecutively formed on the glass substrate. The projected surfaces of the coloring layers due to overlapping with the black matrix are polished to reduce the width of the slope surfaces of the projected surface of the coloring layers. The polishing of the coloring layers prevents a disclination caused by the slope surface.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: February 5, 2008
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Yoko Kocha, Hidenori Ikeno, Hiroki Sato
  • Publication number: 20080026573
    Abstract: The invention provides a production method for an active matrix substrate in which a plurality of contact holes are formed by a one-mask process so as to reach metal films which are present at different depth positions in an insulating layer and are not evaporated by dry etching using a fluorine-containing gas. The method includes a step of performing dry etching using mixed gas of CHF3, CF4 and O2 to form the plurality of contact hole, a step of subjecting the plurality of contact holes to oxygen ashing, and a step of forming a transparent conductive film in the plurality of contact holes.
    Type: Application
    Filed: July 25, 2007
    Publication date: January 31, 2008
    Applicant: NEC LCD Technologies, Ltd.
    Inventors: Kiyoshi Yanase, Satoshi Doi
  • Publication number: 20080024688
    Abstract: An IPS LCD device includes a pixel electrode and a common electrode in each of an array of pixels. The pixel electrode and common electrode is of a comb-shape structure, wherein branch electrodes of the pixel electrode oppose respective branch electrodes of the common electrode. One of the pixel electrode and the common electrode includes control electrodes generating a radial electric field between the control electrodes and the other of the pixel electrode and common electrode.
    Type: Application
    Filed: July 24, 2007
    Publication date: January 31, 2008
    Applicant: NEC LCD Technologies, Ltd.
    Inventor: Chikaaki Mizoguchi
  • Publication number: 20080024423
    Abstract: A driving device for an LCD panel is provided which is capable of preventing the occurrence of light or dark shade among pixels during a non-writing period. All the pixels of the LCD panel are driven by each source driver to receive various signals from a control section and a reference voltage from a reference voltage generating section and each gate driver to receive a gate control signal from the control section using an AC voltage driving method. For a specified period of time after the ending of a writing period, a display data signal, an AC-DC voltage inverting control signal, a latch signal, and a reference voltage are fed to each source driver and an intermediate voltage of an AC driving voltage or a specified voltage is fed to data lines.
    Type: Application
    Filed: July 24, 2007
    Publication date: January 31, 2008
    Applicant: NEC LCD Technologies, Ltd.
    Inventors: Tsuyoshi Ichiraku, Noriyuki Takagi
  • Patent number: 7321414
    Abstract: A liquid crystal display panel includes a moving image display area in which the pixel portions are arranged in a matrix shape and a pictograph display area in which the pixel portions are formed in a fixed pictograph shape. Moreover, first protective elements are inserted between the respective pixel portions in the moving image display area and a drive circuit for the pixel portions and are arranged in an outer periphery of the moving image display area. Second protective elements are inserted between the respective pixel portions in the pictogram display area and a drive circuit for the pixel portions and arranged in an outer periphery of the pictogram display area.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: January 22, 2008
    Assignees: NEC LCD Technologies, Ltd, Citizen Holdings Co., Ltd
    Inventors: Kanetaka Sekiguchi, Kazutoshi Takahashi, Kosei Miyabe, Takakazu Yano, Takahiko Watanabe, Toshiaki Ishiyama, Shinya Ikeda
  • Patent number: 7321413
    Abstract: A liquid crystal display device which includes first and second organic interlaminar insulating films between pixel electrode and wire. The first interlaminar insulating film directly covers source electrode, source wire, drain electrode and back channel. Underlying one of the organic interlaminar insulating films directly contacts a channel part of a TFT. This provides an active matrix type liquid crystal display device with high transmittance and capable of bright displaying, which includes an active matrix wiring substrate having a structure of overlapping wires with a pixel electrode. The device can be prepared at low cost only through 5 photolithographic steps, i.e., without increasing the photolithographic steps as compared with those of the prior liquid crystal display device having high aperture ratio.
    Type: Grant
    Filed: August 8, 2002
    Date of Patent: January 22, 2008
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Shinichi Nakata
  • Publication number: 20080013030
    Abstract: In a display device including a flexible base panel and a display panel mounted on the base panel, a drive circuit component is arranged on a periphery of and spaced away from the display panel and mounted on the base panel. A deformation suppression member is disposed on the base panel at a predetermined portion between the display panel and the drive circuit component.
    Type: Application
    Filed: July 6, 2007
    Publication date: January 17, 2008
    Applicant: NEC LCD Technologies, Ltd.
    Inventor: Akira FUJITA
  • Publication number: 20080007687
    Abstract: Disclosed is an active matrix liquid crystal display device, including a first substrate, a second substrate opposed to the first substrate and a liquid crystal layer sandwiched between the first and the second substrates. The first substrate includes: a scan signal line; a common signal line; an image signal line; a thin film transistor; a pixel electrode connected to the thin film transistor; a common electrode connected to the common signal line; an insulating film sandwiched between the lines and the electrodes; and a concave portion. The second substrate includes: the column-shaped spacers projecting to the first substrate and being almost equal in height to each other. A gap is formed between the first substrate and a tip of the column-shaped spacer at a position corresponding to the concave portion. The column-shaped spacer located at a different position reaches the first substrate.
    Type: Application
    Filed: June 13, 2007
    Publication date: January 10, 2008
    Applicant: NEC LCD Technologies, Ltd.
    Inventor: Takayuki Konno
  • Patent number: 7312840
    Abstract: The object of the present invention is to provide an active matrix liquid crystal display device having an on-chip color filter structure capable of realizing high precision and a high aperture ratio by making a contact hole small in size without deteriorating productivity. A liquid crystal display device with an on-chip color filter structure of the present invention has a structure in which a gate insulating layer and a passivation film on a pixel opening portion for forming a color filter is removed and in which the thickness of the color filter for forming a pattern of the color filter on a stepped portion such as a source of a thin film transistor is set smaller than the film thickness of the color filter on the pixel opening portion.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: December 25, 2007
    Assignees: NEC Corporation, NEC LCD Technologies, Ltd.
    Inventor: Michiaki Sakamoto
  • Publication number: 20070290708
    Abstract: The present invention provides an inspection system with small increase in circuit area and capable of controlling increase in cost to be small. An inspection circuit intervenes between a first circuit and a second circuit. Further, the inspection circuit includes a signaling control portion and an inspection output portion. The signaling control portion controls signaling between the first circuit and the second circuit. Moreover, the inspection output portion outputs an output of the first circuit for inspection through the inspection circuit. In the present invention, the signaling control portion and the inspection output portion share a part of the circuit to realize their own function. Further, the first circuit, the second circuit and the inspection circuit are formed on the same substrate. The inspection circuit switches between the signaling control portion and the inspection output portion to use.
    Type: Application
    Filed: June 12, 2007
    Publication date: December 20, 2007
    Applicants: NEC CORPORATION, NEC LCD Technologies, Ltd.
    Inventor: KENICHI TAKATORI
  • Patent number: 7304706
    Abstract: In an IPS liquid crystal display device, a reduction in optical leakage from the outer peripheral portion of an electrode pattern in flexed configuration and an improvement in the contrast of display on a screen are intended. The IPS liquid crystal display device has a plurality of signal lines and scan lines arranged as a matrix on a TFT substrate, TFT switching elements, and comb-like pixel electrodes connected to the TFT switching elements. In a pixel region, a comb-like common electrode is formed in interdigitated relation with the pixel electrodes. The pixel electrodes, the common electrode, and the signal lines are formed in mutually parallel and flexed configuration at a given angle relative to an optical axis. The outer edge of each pixel electrode, the common electrode, and the signal lines is added with fine stairwise fine stepped portions composed of the same material as composing the electrodes and lines.
    Type: Grant
    Filed: October 25, 2004
    Date of Patent: December 4, 2007
    Assignee: NEC LCD Technologies, Ltd
    Inventor: Chikaaki Mizoguchi
  • Patent number: 7300828
    Abstract: Disclosed is a photoresist film which is formed in a manner of covering at least a source electrode, a source line, a pixel electrode, a drain electrode, a drain line, a semiconductor film and a protective film, and further covering a gate insulting film in their vicinities. Moreover, wet and dry etchings are sequentially performed by using the photoresist film as a mask. Due to this etching, a residual pattern existing on the gate insulating film is etched.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: November 27, 2007
    Assignee: NEC LCD Technologies. Ltd.
    Inventors: Hideto Motoshima, Hisanobu Shimodozono, Junji Nishimoto, Makoto Horinouchi, Shouichi Sonohata
  • Patent number: 7301588
    Abstract: An optical unit comprises a frame. A light conductive plate is combined with the frame only and stationary relative thereto.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: November 27, 2007
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Toshihisa Ogawa
  • Publication number: 20070269938
    Abstract: A stacked film patterning method is provided which is capable of reliably removing residual substances remaining after etching of a metal film, improving etching uniformity of a silicon film, and preventing an occurrence of etching residues. A micro-crystal film and a chromium film are sequentially formed on an insulating film serving as a front-end film and the chromium film is etched to be patterned by using a resist as a mask. Next, a micro-crystal silicon film on which the residual substances exist is exposed to plasma of a mixed gas including chlorine gas and oxygen gas to selectively etch the residual substances on a surface of the micro-crystal silicon film. After that, the micro-crystal silicon film is dry etched.
    Type: Application
    Filed: May 14, 2007
    Publication date: November 22, 2007
    Applicants: NEC CORPORATION, NEC LCD Technologies, Ltd.
    Inventor: Kenichi Hayashi
  • Patent number: 7298358
    Abstract: A liquid crystal display is provided which is capable of improving a quality of a displayed image made up of a moving image and a static image in a mixed manner. By arranging backlights and by dividing one frame of a video input signal into four frame blocks and by getting a moving image detecting circuit to judge whether an image for each of the frame blocks is a moving image or a static image and having a lighting timing duty control section get the backlight corresponding to an image for the frame block having been judged to be a moving image to flash and also get the backlight corresponding to an image for the frame block having been judged to be a static image to be turned ON all the time, occurrence in an image retention phenomenon or a blur of an edge is reduced when a moving image is to be displayed and occurrence of a flicker is eliminated when a static image is to be displayed, which enables improvements in a quality of a displayed image.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: November 20, 2007
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Nobuaki Honbo
  • Patent number: 7291283
    Abstract: A combined wet etching method for stacked films which is capable of performing etching processes in a collective manner while controlling an amount of side-etching on each of stacked films and of making uniform side edges. In the wet etching method, two or more types of etching methods are performed in combination, on stacked films containing first and second films being deposited sequentially on a substrate and each having a different film property. The two or more types of wet etching methods include, at least, a first wet etching method in which side-etching on the first film is facilitated more than side-etching on the second film and a second wet etching method in which side-etching on the second film is facilitated more than side-etching on the first film.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: November 6, 2007
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Tadanori Uesugi, Shigeru Kimura
  • Publication number: 20070249134
    Abstract: A laser irradiation process includes: scanning a substrate with laser having a predetermined lasing frequency at different irradiation intensities to form a plurality of first irradiation areas corresponding to the irradiation intensities; illuminating the first irradiation areas to reflected light receive from the fist irradiation areas; determining microcrystallization intensity based on the received reflected light; and determining irradiation intensity based on the thus determined microcrystallization intensity. The laser irradiation process uses the irradiation intensity for irradiating a polycrystalline film in a product semiconductor device.
    Type: Application
    Filed: April 19, 2007
    Publication date: October 25, 2007
    Applicants: NEC CORPORATION, NEC LCD Technologies, Ltd.
    Inventors: MITSURU NAKATA, Hirofumi Shimamoto, Hiroshi Kanoh
  • Patent number: 7280178
    Abstract: A liquid crystal display device includes a sealing member provided region of a line-extracting portion 508 which is divided into three or more regions (three regions of a region A 151, a region B 152, and a region C 153) to suppress the unevenness attributable to the difference in the density of the outgoing lines 108 reliably. Moreover, the variation in the, gap is suppressed to an indiscernible level in each of the regions. In addition, dummy patterns are formed on a different layer from the layer where the outgoing lines 108 are formed under a condition not affecting the curing of the sealing member. Moreover, dummy patterns are formed similarly on an edge opposed to the line-extracting portion 508 when appropriate.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: October 9, 2007
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Yoshiaki Hashimoto