Patents Assigned to NEC LCD Technologies
  • Liquid crystal display device, and light source driving circuit and method to be used in same
    Patent number: 7489295
    Abstract: A liquid crystal display device is provided which is capable of preventing flicker or fringes in a display screen occurring even when changes in frequencies of a vertical sync signal and horizontal sync signal contained in a video signal input to the liquid crystal display device occur. A frequency detecting circuit sets a frequency of a driving pulse voltage at a value in the vicinity of “positive integer+½” times of the frequency of the horizontal sync signal and a pulse frequency for PWM (Pulse Width Modulation) light control at a value in the vicinity of a positive integral multiple or “positive integer+½” times of the vertical sync signal and a resonant frequency at a value in the vicinity of the frequency of the driving pulse voltage by adjusting capacitance value of a resonant capacitor.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: February 10, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Nobuaki Honbo
  • VIDEO PROCESSING METHOD, VIDEO DISPLAY DEVICE AND ITS TIMING CONTROLLER
    Publication number: 20090033650
    Abstract: Video processing method, a video display device and its timing controller can support video signals having different types of resolutions from ones set in advance without a special circuit identifying the resolution. Timing controller of video display device generates a first horizontal reference signal (HRST_start) indicating start of an active period of a data enable signal and a second horizontal reference signal (HRST_end) indicating end of the active period from an input video signal. Next, timing controller generates control signals (HSP, STB, POL, VCK, and VOE) based on the number of clocks from the rise of the first and second horizontal reference signals (HRST_start and HRST_end) and on signal generation timing values (?, A to D) predetermined for each control signal supplied to drivers.
    Type: Application
    Filed: July 29, 2008
    Publication date: February 5, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventor: Hiroshi TAKEDA
  • DISPLAY DEVICE
    Publication number: 20090033826
    Abstract: A display device which enables size reduction, particularly in the frame thereof, and allows a thinner liquid crystal panel and a larger screen is provided. Positioning of a liquid crystal panel is performed by contacting the outer periphery of a back side polarizing plate, which is affixed to a second transparent substrate configuring the main part of the liquid crystal panel, with the inside of a protruded fitting portion formed on the frame of a backlight assembly. Thereby, the display panel can be positioned securely without enlarging the outside dimension of the front chassis and the frame. This enables to realize a small-size display device, particularly, size reduction in the frame of the front chassis and reduction of the outside dimension.
    Type: Application
    Filed: July 30, 2008
    Publication date: February 5, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventor: Takeya SHIMIZU
  • Display device, manufacturing method of display device, and manufacturing apparatus for the same
    Publication number: 20090027592
    Abstract: A display device includes a first display device, a second display device bonded to the first display device, and an adhesive provided between the first display device and the second display device to fix the first display device on the second display device, and including a light diffusion particle.
    Type: Application
    Filed: July 10, 2008
    Publication date: January 29, 2009
    Applicant: NEC LCD Technologies, Ltd.
    Inventor: Toshihiko Motomatsu
  • STACKED LCD UNIT
    Publication number: 20090027598
    Abstract: A LCD unit includes a plurality of LC panels stacked one on another. If a picture to be displayed on the LCD unit is a still picture, one of the LC panels consecutively scans plurality of rows of pixels in a direction opposite to the scanning direction of the rows of pixels in the rest of LC panels. If the picture is a moving picture, all the LC panels consecutively scans in the same direction.
    Type: Application
    Filed: July 25, 2008
    Publication date: January 29, 2009
    Applicant: NEC LCD TECHNOLOGIES. LTD.
    Inventors: Hidenori IKENO, Takashi Yatsushiro
  • In-plane switching liquid crystal display device
    Patent number: 7483106
    Abstract: A data wiring is provided on a glass substrate in an active element substrate. For the data wiring, a first portion, extending in a direction that slopes and forms a fixed angle with respect to the rubbing direction of an oriented film, and a second portion, extending in a direction sloping to the opposite side of the first portion are alternately arranged and formed in a zigzag pattern. A convex insulation film is formed in a zigzag pattern to cover the data wiring and a common electrode is formed in a zigzag pattern to cover the insulation film. A shilding layer is formed in a zigzag pattern on an opposing substrate to completely cover the insulation film and does not protrude from the region directly above the common electrode. The high-contrast, multi-domain system in-plane switching type liquid crystal display device obtained with a high numerical aperture and low black brightness.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: January 27, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Hideki Ito, Daisuke Inoue, Takashi Kamino, Hiromitsu Tanaka
  • SEMICONDUCTOR CIRCUIT, DISPLAY APPARATUS EMPLOYING THE SAME, AND DRIVING METHOD THEREFOR
    Publication number: 20090021466
    Abstract: Disclosed is a display apparatus including two scanning circuits of the same configuration and layout, arranged on either sides of the display part. As long as one of the scanning circuits is in operation, the other scanning circuit is in a state in which no output signal is output.
    Type: Application
    Filed: July 17, 2008
    Publication date: January 22, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventors: Tomohiko OTOSE, Masamichi Shimoda
  • Liquid crystal display device
    Publication number: 20090015748
    Abstract: A liquid crystal display device includes a liquid crystal display panel and a light source consisting of a plurality of light emitting devices and the light emitting devices are divided into a plurality of groups, and each group's light emitting device is mounted on a different structural member, respectively.
    Type: Application
    Filed: July 8, 2008
    Publication date: January 15, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD
    Inventors: Hideki Kujiraoka, Osamu Ohkanda
  • BACKLIGHT DRIVING METHOD OF LIQUID CRYSTAL DISPLAY DEVICE, BACKLIGHT DRIVING DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE
    Publication number: 20090015541
    Abstract: There is provided a method of driving a backlight of a liquid crystal display device capable of eliminating leakage of light from adjacently-placed light emitting blocks. A gray level and maximum gray level of an input video signal are inputted for every light-emitting block. An output average gray level is calculated and a lighting control signal corresponding to converted luminance is outputted. The drivers responding to the lighting control signal makes LEDs (Light Emitting Diodes) emit light. An average gray level from an output from sensors is calculated. An average gray level, based on an average gray level and a light leakage rate, by taking light leakage into consideration. A gray level correcting signal is outputted in the light-emitting block based on the above output average gray level. An output average gray level is corrected in response to a gray level correcting signal.
    Type: Application
    Filed: July 8, 2008
    Publication date: January 15, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventor: Nobuaki HONBO
  • LIGHT EMISSION CONTROL CIRCUIT, LIGHT EMISSION CONTROL METHOD, FLAT ILLUMINATING DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME DEVICE
    Publication number: 20090015759
    Abstract: There is provided a light emission control circuit being capable of simplifying a power source circuit reducing costs and power consumption. A constant current circuit is serially connected to a specified light emitting device group out of a plurality of light emitting device groups and a power source circuit supplies power to each light emitting device group and a current detecting unit detects a current flowing through a specified light emitting device group and a power control unit controls a power source circuit based on a pre-set current value and on a detected value.
    Type: Application
    Filed: July 3, 2008
    Publication date: January 15, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD
    Inventor: Nobuaki HONBO
  • LIQUID CRYSTAL DISPLAY DEVICE
    Publication number: 20090015744
    Abstract: To provide a pixel matrix and the like, which are capable of improving the picture quality by suppressing generation of flicker and crosstalk without deteriorating the numerical aperture of the pixels and without increasing the manufacturing cost. A first switch device has transistors connected in series. When selected by a gate line, the transistors are set ON simultaneously to apply a voltage, which is supplied from a data line, to a pixel electrode. A second switch device has a transistor and a control capacitor. When selected by a gate line different from the one mentioned above, the transistor is set ON to supply a prescribed potential to a connection point between the transistors of the first switch, and the prescribed potential is stored at the control capacitor. When not selected by the both gate lines, the potential of the connection point is kept to the potential stored at the control capacitor.
    Type: Application
    Filed: July 8, 2008
    Publication date: January 15, 2009
    Applicant: NEC LCD Technologies, Ltd.
    Inventor: HIROYUKI SEKINE
  • ACTIVE-MATRIX-DRIVE DISPLAY UNIT INCLUDING TFT
    Publication number: 20090014722
    Abstract: An active-matrix-drive LCD includes a TFT substrate, on which a TFT is formed. The TFT includes a gate electrode layer, a gate insulating film, a patterned semiconductor layer, and a source/drain electrode layer, which are consecutively formed on an insulating substrate of the TFT substrate. The gate electrode layer has a thickness smaller than a thickness of the gate insulating film.
    Type: Application
    Filed: July 9, 2008
    Publication date: January 15, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventor: Satoshi Doi
  • THIN FILM TRANSISTOR AND MANUFACTURING METHOD OF THE SAME
    Publication number: 20090014721
    Abstract: To achieve TFT having a high light-resistance characteristic with a suppressed light leak current at low cost by simplifying the manufacturing processes. The TFT basically includes a light-shielding film formed on a glass substrate that serves as an insulating substrate; an insulating film formed on the light-shielding film; a semiconductor film formed on the insulating film; and a gate insulating film formed on the semiconductor film. Each layer of a laminate that is configured with three layers of the light-shielding film, the insulating film, and the semiconductor film is patterned simultaneously. Further, each layer of the laminate is configured with silicon or a material containing silicon.
    Type: Application
    Filed: July 9, 2008
    Publication date: January 15, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventor: Hiroshi TANABE
  • FLAT DISPLAY MODULE
    Publication number: 20090015777
    Abstract: In a display module, a flexible wiring substrate is connected to a terminal portion of a flat display panel, and a reinforcing member is attached to at least one surface of the display panel. The reinforcing member is made wider than the flexible substrate and is arranged so as to cover those regions extending from an overlapping region of two substrates of the display panel to a region extending and reaching the flexible substrate located outside of the terminal portion.
    Type: Application
    Filed: July 8, 2008
    Publication date: January 15, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD.,
    Inventor: FUTOSHI NAKANISHI
  • Method for manufacturing thin film semiconductor device and method for forming resist pattern thereof
    Patent number: 7476470
    Abstract: A method for manufacturing a thin film semiconductor device is provided which is capable of achieving simplification of manufacturing processes and of improving alignment accuracy without using a plurality of alignment masks. An alignment pattern is formed by using a resist layer having a plurality of regions each having a different film thickness corresponding to each of a plurality of patterns produced using a halftone mask having a halftone exposure region as a photomask and by forming a light transmitting portion to be an aperture pattern and by etching an underlying silicon layer. By having an underlying silicon layer exposed and implanting ions into an entire resist layer, only a main pattern region is doped with the ions.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: January 13, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Mitsuasa Takahashi
  • Thin film and manufacturing method of the same
    Patent number: 7476898
    Abstract: A TFT of the present invention includes a gate electrode, a gate insulating film and a first semiconductor film which are sequentially formed on an insulating substrate, a second semiconductor film including a high density impurity which is formed on the first semiconductor film while being separated into portions at grade and a first electrode and a second electrode, each of which is formed on the separated second semiconductor film. Further, a peripheral portion of the first semiconductor film includes a protruded portion toward the outside from an edge of the second semiconductor film, and a surface of the protruded portion is roughened. By roughening the surface of the protruded portion, an on-current of the TFT can be maintained and the leakage current can be suppressed.
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: January 13, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Mitsuma Oishi, Masayuki Uehara
  • Active matrix substrate and method of manufacturing the same
    Patent number: 7476899
    Abstract: Extraction wirings are respectively connected to a signal line of a switching element and a scanning line thereof, and led out to one side portion of a transparent insulating substrate. Conductive terminals respectively united with the extraction wiring are formed in tip end portions thereof, and a plurality of contact holes connected to the conductive terminals are formed on the conductive terminals so that a diver IC is mounted thereon by using conductive resin. Each of the extraction wirings is provided with a semiconductor film pattern in the vicinity of the contact hole for blocking the moisture in the conductive resin to reach the extraction wirings through an interlayer insulating film.
    Type: Grant
    Filed: May 12, 2005
    Date of Patent: January 13, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Hideto Motoshima, Masatoshi Tani, Shoichi Sonohata
  • TRANSFLECTIVE TYPE LCD DEVICE HAVING EXCELLENT IMAGE QUALITY
    Publication number: 20090009447
    Abstract: An LCD device has a reflective area that reflects light incident from a polarizing film side using a reflection film, and a transmissive area that transmits light of a backlight incident from a TFT substrate side. The drive voltages of the reflective area and transmissive area are Vr and Vt, the black voltage in the reflective area is Vr (K), the black voltage in the transmissive area is Vt (K). The reflectance R, the transmittance T, characteristics of R with respect to drive voltage [Vr(K)-Vr] and characteristics of T with respect to drive voltage [Vt-Vt (K)] substantially match each other.
    Type: Application
    Filed: January 9, 2008
    Publication date: January 8, 2009
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventors: Kenichirou NAKA, Michiaki SAKAMOTO, Kenichi MORI, Hiroshi NAGAI
  • In-plane-switching-mode LCD device having a higher image quality
    Patent number: 7474374
    Abstract: An in-plane-switching-mode (IPS) LCD device includes a TFT substrate and a CF substrate sandwiching therebetween a liquid crystal (LC) layer, and a pair of polarizing films sandwiching therebetween the TFT and CF substrates and LC layer. The TFT substrate includes a SiNx insulation layer having a higher refractive index compared to the TFT substrate and LC layer. The thickness (d) of the SiNx layer is expressed by d=(100+170×k)±30 where k is an integer not smaller than zero and not larger than 5. The protective layer of the light-incident-side polarizing film near the insulation film has a thickness larger than zero and not larger than 57 ?m.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: January 6, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Hiroshi Nagai, Hidenori Ikeno
  • Laser irradiation method and apparatus for forming a polycrystalline silicon film
    Patent number: 7473657
    Abstract: A method for changing an amorphous silicon film to a poly-crystalline silicon film includes the steps of irradiating an elongate pulse laser beam onto the silicon film while scanning in the direction normal to the major axis of the elongate pulse laser beam, to form a plurality of irradiated areas, irradiating flat-surface light onto the irradiated areas in the direction parallel to the major axis, and analyzing distribution of the reflected light from the irradiated areas to determine the threshold value of micro-crystallization. The threshold value is used to further determine an energy density of the elongate pulse laser beam for the phase change process.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: January 6, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Hiroshi Okumura