Patents Assigned to NEC LCD Technologies
  • Patent number: 7126572
    Abstract: A display panel 13 having a plurality of pixels 14 each divided into P (P=3) sub-pixels 15a, 15b and 15c, and a source driver 12 for driving each pixel 14 in accordance with three J (=8)-bit data values corresponding to the sub-pixels 15a, 15b, and 15c, and a signal processing circuit 12 for distributing K(=12)-bit (K>J) input image data as M (M=6) time-shared frame data values and supplying the frame data values to the source driver 12 are arranged. 2K?J (=16) gray levels insufficient due to the difference between the numbers of bits of K-bit input image data and J-bit driving signals of the source driver 12 is realized by combinations of time-shared frame data of (P×M=18) ways performed for the sub-pixels 15a, 15b, and 15c in accordance with the M time-shared frame data values.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: October 24, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Koichi Koga, Noboru Okuzono, Machihiko Yamaguchi
  • Patent number: 7123325
    Abstract: A liquid crystal display panel of the type having reflection electrodes tends to have an image-forming plane undesirably yellowed due to the wavelength dependency of transparency observed in an orientation layer on the reflection electrodes; aluminum-neodymium alloy, which has neodymium content between 5 weight % to 10 weight %, is deposited on an inter-layered insulating layer at the substrate temperature equal to or less than 170 degrees in centigrade for the reflection electrodes so that the surface morphology is represented by average pitches equal to or less than 1 micron; even though the orientation layer has the wavelength dependency of transparency, the reflection electrodes make the optical path in the orientation layer equalized so that the image-forming plane is not yellowed.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: October 17, 2006
    Assignee: NEC LCD Technologies, Ltd
    Inventors: Akitoshi Maeda, Atsushi Yamamoto, Tomohide Shindoh
  • Patent number: 7123337
    Abstract: A LCD device is provided. On the input side, the collimated-light generator generates collimated light from incident light and then, the first polarizer plate of the first polarized-light controller generates first polarized light from the collimated light. The first quarter wavelength plate of the first polarized-light controller generates second polarized light from the first polarized light. The second polarized light thus generated passes through the liquid crystal layer to reach the output side. On the output side, the second polarized light passes through the second quarter wavelength plate of the second polarized-light controller and the second quarter wavelength plate thereof. Thus, the polarization state of the second polarized light is returned to its original one.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: October 17, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Hiroshi Okumura, Masayoshi Suzuki
  • Patent number: 7116297
    Abstract: In a liquid crystal display device where each unit pixel p arranged on a liquid crystal panel 101A is constituted by a plurality of pixels p1, p2, and p3, the pixels p1, p2, and p3 are divided into sub-pixels p11 and p12, sub-pixels p21, and p22, and sub-pixels p31 and p32, respectively. The liquid crystal display device is provided with driver ICs 201 and 202 for driving the sub-pixels p11, p21, and p31, and the sub-pixels p12, p22, and p32 constituting the pixels so that different gradation-brightness value characteristics may be given. Due to this, multi-gradation display can be performed.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: October 3, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Koichi Koga, Noboru Okuzono, Machihiko Yamaguchi
  • Patent number: 7110070
    Abstract: In order to improve processing steps of fabricating an active-matrix addressed reflective liquid crystal display, a lower substrate, which is positioned at one side with respect to a liquid crystal layer, is provided with two electrodes in parallel with each other and in parallel with the liquid crystal layer. One of the two electrodes is electrically coupled to a source electrode of a switching element assigned to one pixel, and the other electrode is electrically couple to a constant potential source. Each of the two electrodes has characteristics of light reflectivity, which is able to reduce the intensity of exposing light when an insulating layer provided above the electrodes is patterned.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: September 19, 2006
    Assignees: NEC Corporation, NEC LCD Technologies, Ltd.
    Inventors: Michiaki Sakamoto, Yuichi Yamaguchi, Hidenori Ikeno, Fumihiko Matsuno, Hironori Kikkawa
  • Patent number: 7110058
    Abstract: The method of fabricating a liquid crystal display device includes the steps of (a) fabricating a switching device on a substrate, (b) forming an interlayer insulating film on the substrate such that the switching device is covered with the interlayer insulating film, and (c) forming a transparent electrode on the interlayer insulating film, the transparent electrode being electrically connected to the switching device through the interlayer insulating film, the step (c) including (c1) depositing electrically conductive, transparent and amorphous material on the interlayer insulating film, (c2) patterning the material into the transparent electrode, and (c3) turning the transparent electrode into polysilicon by thermal annealing carried out after formation of an alignment film.
    Type: Grant
    Filed: May 20, 2005
    Date of Patent: September 19, 2006
    Assignee: NEC LCD Technologies
    Inventors: Takasuke Hayase, Keiko Yamada, Masami Yamashita, Shinichi Nakata, Akitoshi Maeda
  • Patent number: 7106402
    Abstract: A reflection liquid crystal display is such that a transparent substrate is opposed to the first substrate with a liquid crystal layer placed therebetween, and the transparent substrate is disposed forward to the first substrate in the light-incident direction. A quarter-wavelength plate is disposed in the transparent substrate, and a polarization plate is disposed on the surface at the forward side thereof in the light-incident direction. And, a reflection layer besides acting as a color filter consisting of a cholesteric liquid crystal is disposed inside liquid crystal cells of the first substrate. In the case of a wide field-of-view angle, a scattering film is disposed forward to the polarization plate in the light-incident direction.
    Type: Grant
    Filed: June 15, 2004
    Date of Patent: September 12, 2006
    Assignees: NEC Corporation, NEC LCD Technologies, Ltd.
    Inventors: Masayoshi Suzuki, Teruaki Suzuki, Toshiya Ishii
  • Patent number: 7105368
    Abstract: A LCD device prevents the color irregularities (e.g., the red-color irregularity) from occurring without complicating the fabrication processes of a color filter. Switching elements are formed on a first substrate. A color layer is formed on a second substrate. The color layer has a red sublayer, a green sublayer, and a blue sublayer. A liquid-crystal layer is located between the first and second substrates. The second substrate includes no electrodes formed in such a way as to be located on a side nearer to the liquid-crystal layer with respect to the color layer. A green-coloring composition forming the green sublayer contains a pigment having a copper phthalocyanine skeleton. A ratio in weight of the pigment with respect to the green-coloring composition is equal to or less than approximately 27%.
    Type: Grant
    Filed: June 8, 2005
    Date of Patent: September 12, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Eriko Fujimaki, Sounosuke Takahashi
  • Patent number: 7105896
    Abstract: A thin film transistor circuit device and the production method thereof is demanded for a thin film transistor circuit device, which contains wiring having a structure of an aluminum alloy in a lower layer and a molybdenum alloy in an upper layer, wherein corrosion in air of the molybdenum alloy does not proceed easily. A thin film transistor circuit device which exposes a portion of wiring covered with an insulating film that connects thin film transistors of a main circuit region formed on a center portion of a substrate to a protection circuit region formed on an outer periphery of the substrate, which contains on the exposed surface a terminal which is formed of terminal electrode metal, wherein an uppermost surface of the wiring is a molybdenum alloy comprising niobium.
    Type: Grant
    Filed: July 21, 2004
    Date of Patent: September 12, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Hiroaki Tanaka, Kyounei Yasuda, Seiji Suzuki
  • Patent number: 7106394
    Abstract: A double-sided, direct-irradiation type backlight unit has a structure of capable of reducing the luminance irregularity and improve the luminance efficiency. The backlight unit has a scatter-reflection rod member 101 between each adjacent two of elongate lamps. The scatter-reflection rod member 101 has a symmetric shape with respect to the line passing the center thereof in X-direction, and that passing the center thereof in Y-direction. The light emitted from the elongate lamp 102 in X-direction is reflected by the scatter-reflection-rod member 101 and then travels in the direction toward the front- and rear-side diffusion plates 106.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: September 12, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Shin-Ichirou Ono, Hirokazu Fukuyoshi
  • Patent number: 7102707
    Abstract: A LCD device prevents the color irregularities (e.g., the red-color irregularity) from occurring without complicating the fabrication processes of a color filter. Switching elements are formed on a first substrate. A color layer is formed on a second substrate. The color layer has a red sublayer, a green sublayer, and a blue sublayer. A liquid-crystal layer is located between the first and second substrates The second substrate includes no electrodes formed in such a way as to be located on a side nearer to the liquid-crystal layer with respect to the color layer. A green-coloring composition forming the green sublayer contains a pigment having a copper phthalocyanine skeleton. A ratio in weight of the pigment with respect to the green-coloring composition is equal to or less than approximately 27%.
    Type: Grant
    Filed: April 3, 2003
    Date of Patent: September 5, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Eriko Fujimaki, Sounosuke Takahashi
  • Patent number: 7098970
    Abstract: In an active matrix type liquid crystal display device comprising a TFT having gate lines and data lines formed in a matrix manner and being connected to a source line, a contact hole for connecting the source line with a pixel electrode is formed in a position overlapping a disclination line. The contact hole is formed in a position overlapping a capacitance portion of the gate line. The gate line and the source line are provided to oppose to each other, and electrostatic capacitance is stored therebetween.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: August 29, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Masanobu Hidehira, Michiaki Sakamoto, Shouichi Kuroha, Mamoru Okamoto
  • Publication number: 20060187392
    Abstract: A semi-transmissive-type liquid crystal display device is provided which is capable of preventing an electric erosion reaction between a reflective film made of Al (aluminum) or an Al alloy and a transparent electrode film made of ITO or a like (Indium Tin Oxide) and of inhibiting occurrence of a flicker caused by a residual DC (Direct Current) voltage in the reflective film. In the semi-transmissive-type of a liquid crystal display device, a transmissive region to provide light from a backlight source and a reflective region to receive ambient light are placed in a pixel region and a transparent electrode film is formed above a reflective film formed in the reflective region on an active matrix substrate with a second passivation film being interposed between the reflective film and the transparent electrode film.
    Type: Application
    Filed: April 20, 2006
    Publication date: August 24, 2006
    Applicant: NEC LCD Technologies, Ltd.
    Inventors: Mamoru Okamoto, Michiaki Sakamoto, Osamu Sukegawa, Ken-Ichirou Naka, Shin-Ichi Nakata, Masami Yamashita
  • Patent number: 7091943
    Abstract: A liquid crystal display device includes a plurality of pixels arranged in a matrix, a drain line provided for each column of the plurality of pixels, a gate line provided for each row of the plurality of pixels, and an output buffer to output a video signal supplied to the drain line. Also provided is a video correction signal generator to superpose a correction signal on the output signal of the output buffer.
    Type: Grant
    Filed: November 19, 2003
    Date of Patent: August 15, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Hiroshi Takeda, Shinji Kiyomatsu
  • Patent number: 7092051
    Abstract: A reflector for a reflection-type LCD device is provided, which reflects efficiently incident light to the viewer's side and that suppresses the change of color tone. The reflector comprises a roughened surface having a protrusion pattern. The protrusion pattern gives inclination angle to the surface according to a specific distribution where a first component with an inclination angle value of 0° is 15% or less in area and a second component with an inclination angle value from 2° to 10° is 50% or greater in area. The protrusion pattern gives a variation range of chromaticity coordinates (x, y) on a chromaticity diagram dependent on an angle of view. The variation range is limited in a circle on the chromaticity diagram. The circle has a radius of approximately 0.05 and a center at a point corresponding to white color.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: August 15, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Michiaki Sakamoto, Yuichi Yamaguchi, Hidenori Ikeno, Fumihiko Matsuno, Hironori Kikkawa
  • Patent number: 7092066
    Abstract: An apparatus for manufacturing a liquid crystal display is provided with a first supporter for supporting a first substrate with the state of restraining the displacement in a surface direction of the first substrate on a first surface plate, a second supporter for supporting a second substrate with the state of restraining the displacement in a surface direction of the second substrate on a second surface plate, a pressurized for press-welding the first and second substrates by pressing the first and second surface plates, and a position-aligning mechanism for performing an alignment between the first and second substrates while the pressing means presses the first and second surface plates.
    Type: Grant
    Filed: September 8, 2003
    Date of Patent: August 15, 2006
    Assignee: NEC LCD Technologies
    Inventor: Akehiro Matsuda
  • Patent number: 7091521
    Abstract: An LCD device includes a common line such as power source line in addition to data lines and scanning lines in the display area. The common line is connected to a plurality of peripheral leads in the peripheral area, the peripheral leads including first-type leads and second-type leads. The first-type lead is made of an ITO film for achieving a long-term reliability whereas the second-type lead has a two-layer structure including a metallic film and an ITO film for achieving a lower line resistance.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: August 15, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Futoshi Nakanishi
  • Patent number: 7092049
    Abstract: An in-plane switching mode LCD device includes a shield common electrode having a protrusion protruding from side edges of a drain line, and a pair of light shield films sandwiching therebetween the drain line and having an overlapping portion overlapping the protrusion. The shield common electrode shields the electric field from the drain line, and the light shield films improve the contrast ratio of the LCD device.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: August 15, 2006
    Assignee: NEC LCD Technologies Ltd.
    Inventors: Tsutomu Kadotani, Yusuke Nogami
  • Patent number: 7090365
    Abstract: A backlight unit includes front and rear emission surfaces and a plurality of lamps arranged in the central plane of the backlight unit, wherein the front and rear emission surfaces are inclined by +? and ?? degrees with respect to the central plane. The pitch of the lamps increases along the direction in which the distance between the emission surface and the central plane increases.
    Type: Grant
    Filed: October 21, 2004
    Date of Patent: August 15, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Toshihisa Ogawa, Shin-ichirou Ono
  • Publication number: 20060175611
    Abstract: A thin film transistor circuit device and the production method thereof is demanded for a thin film transistor circuit device, which contains wiring having a structure of an aluminum alloy in a lower layer and a molybdenum alloy in an upper layer, wherein corrosion in air of the molybdenum alloy does not proceed easily. A thin film transistor circuit device which exposes a portion of wiring covered with an insulating film that connects thin film transistors of a main circuit region formed on a center portion of a substrate to a protection circuit region formed on an outer periphery of the substrate, which contains on the exposed surface a terminal which is formed of terminal electrode metal, wherein an uppermost surface of the wiring is a molybdenum alloy comprising niobium.
    Type: Application
    Filed: March 21, 2006
    Publication date: August 10, 2006
    Applicant: NEC LCD Technologies, Ltd.
    Inventors: Hiroaki Tanaka, Kyounei Yasuda, Seiji Suzuki