Patents Assigned to NEC LCD Technologies
  • Patent number: 6831726
    Abstract: In a liquid crystal display panel, by adhering the TFT substrate 1 to the color filter (CF) substrate 2 such that the repeating direction of thickness distribution or irregularity distribution of the TFT substrate 1 becomes orthogonal to the repeating direction of thickness distribution or irregularity distribution of the CF substrate 2, a distance between a point at which the thick portion of the TFT substrate 1 overlaps on the thick portion of the CF substrate 2 and a point at which the thin portion of the TFT substrate 1 and the thin portion of the CF substrate 2 are overlapped becomes larger than that in a case where the substrates are adhered each other with the repeating directions thereof being trued up. Therefore, the factor defective of the liquid crystal display panel caused by the overlapping of the thick portions and the overlapping of the thin portions of the substrates, that is, the factor defective of the liquid crystal display panel caused by variation of display, can be reduced.
    Type: Grant
    Filed: April 23, 2001
    Date of Patent: December 14, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Yoshinori Aoyagi, Yuji Tanaka, Hironori Shiba
  • Patent number: 6831715
    Abstract: A semi-transmission type liquid crystal display that maximizes the luminance in reflection mode and transmission mode. The liquid crystal display comprises a lower substrate with thin film transistors, an opposite substrate facing the lower substrate, a liquid crystal layer between the lower substrate and the opposite substrate, a reflection electrode formed in a reflection area of the lower substrate, a transparent electrode formed in a transparent area of the lower substrate, a common electrode formed on the opposite substrate, and a drive circuit for applying a voltage between the reflection electrode and the transparent electrode and the common electrode. The potential difference between a drive voltage applied to that surface of the lower substrate which contacts the liquid crystal layer and a drive voltage applied to that surface of the opposite substrate which contacts the liquid crystal layer is lower in the transparent area than in the reflection area.
    Type: Grant
    Filed: August 12, 2002
    Date of Patent: December 14, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Hidenori Ikeno, Masayoshi Suzuki
  • Patent number: 6831295
    Abstract: A TFT-LCD device has a plurality of scanning lines formed by a first level metallic layer, a plurality of data lines formed by a second level metallic layer, and an array of pixels each having a TFT and a pixel electrode made of a third level ITO layer. Each pixel further includes a shied ring formed by the second level metallic layer for suppressing variance in the parasitic capacitances formed between the pixel electrode and other conductive layers. The suppression of the variance in the parasitic capacitances reduces the feed-through voltage, thereby improving the display performance of the TFT-LCD device.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: December 14, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Yumiko Tsubo
  • Patent number: 6831627
    Abstract: A liquid crystal display includes an electro-luminescence portion which has electro-luminescence elements and a liquid crystal portion which has liquid crystal layer, scanning electrodes and signal electrodes and controls the transmittance of light emitted by the electro-luminescence elements. First, scanning pulses are applied in sequence to the scanning electrodes. Next, a gradation signal are applied associated with image data to the signal electrodes. Then, the electro-luminescence portion is allowed to emit light of a plurality of colors at the same time in pixels after transmissivity of the liquid crystal layers in the pixels reaches a predetermined value. The pixels are located at the intersections between a scanning electrode to which the scanning pulse is applied and the signal electrodes to which the gradation signal is applied.
    Type: Grant
    Filed: April 4, 2001
    Date of Patent: December 14, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Fumio Hasegawa, Makoto Aoki
  • Patent number: 6830354
    Abstract: A relatively small-diameter aperture fluorescent lamp is manufactured easily with high yield and at low cost. An aperture portion is formed in a manner that a thread-like member is inserted into a glass tube having an ultraviolet ray reflection layer and a phosphor layer formed on its inner surface, the glass tube is bent in a predetermined shape by using a bending jig, the thread-like member is pressed to the phosphor layer formed in a predetermined region in the bending member side of the glass tube while both ends thereof are pulled tight, the thread-like member is reciprocated, and phosphor of the phosphor layer in this region is exfoliated.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: December 14, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Shin-Ichirou Ono
  • Publication number: 20040246394
    Abstract: A backlight assembly comprises a plurality of linear light sources arranged in parallel behind a display screen. The plurality of linear light sources is divided into a first group and a second group. The linear light sources belonging to the first group are oriented in a first direction. The linear light sources belonging to the second group are oriented in a second direction opposite to the first direction. The backlight assembly comprises a first inverter substrate for driving the linear light sources belonging to the first group, and a second inverter substrate for driving the linear light sources belonging to the second group. The first and second substrates are arranged on one side of the linear light sources and the opposite side thereof, respectively.
    Type: Application
    Filed: May 19, 2004
    Publication date: December 9, 2004
    Applicant: NEC LCD Technologies, Ltd.
    Inventors: Shin-ichirou Ono, Hirokazu Fukuyoshi
  • Patent number: 6829025
    Abstract: The thickness of a liquid crystal layer of a reflection type or semi-transparent type liquid crystal display device and the driving voltage are determined in such a manner that the reflectance of the liquid crystal layer to the blue light component has a maximum value; the values of reflectance to the red, green and blue light components are close to one another in the range lower than the driving voltage; the reflection type or semi-transparent type liquid crystal display device produces a full color image in the driving voltage range where the values of reflectance are close to one another so that the color irregularity and tint irregularity are suppressed.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: December 7, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Michiaki Sakamoto
  • Publication number: 20040239857
    Abstract: The TFT substrate of an LCD device has an array of pixel electrodes defined by a plurality of signal lines and a plurality of scanning lines. Each terminal of the scanning lines includes a first metallic pattern, a second metallic pattern in contact with the first metallic pattern through a first via hole, and an ITO pattern in contact with the second metallic pattern through a second via hole. The ITO pattern has a width smaller than the width of the first via hole and larger than the second via hole, thereby providing the TFT substrate with a smaller level difference. The smaller level difference prevents the dust generated during a rubbing treatment from attaching onto the TFT substrate.
    Type: Application
    Filed: May 19, 2004
    Publication date: December 2, 2004
    Applicant: NEC LCD Technologies, Ltd.
    Inventor: Tae Yoshikawa
  • Publication number: 20040239865
    Abstract: In an LCD, according to an embodiment of the present invention, a projection 6 is structured on top of insulation layer 8 on a TFT glass substrate 10 and under part of a black matrix 9. The projection 6 encircles the transparent region in each pixel so that a spacer 17 cannot climb over the projection 6 and enter the transparent region even though a certain pressure is applied onto the substrates 10 and 11. The width of the projection 6 is equal to or less than the diameter of the spacer 17. The height of the projection 6 is equal to or longer than approximately 1% the length of the diameter of the spacer 17, and it is preferable that it be equal to or longer than approximately 2%.
    Type: Application
    Filed: July 2, 2004
    Publication date: December 2, 2004
    Applicant: NEC LCD Technologies, Ltd.
    Inventor: Shoichi Kuroha
  • Patent number: 6825910
    Abstract: First, a plurality of liquid crystal display panels having filling ports for filling liquid crystal are arranged. Next, a ultraviolet ray curing sealing agent in a wet state is transferred to each of the filling ports by a transfer roller in a lump. Then, an ultraviolet ray is irradiated to the ultraviolet ray curing sealing agent.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: November 30, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Eiichirou Aoki, Tsutomu Uemura
  • Publication number: 20040233154
    Abstract: A backlight unit comprises a chassis having a bay, wall means defining the bay, an aperture opening to the bay, and an optical panel that includes at least one light management feature. The optical panel has one side forming a wall portion of the wall means. A light emitting structure is placed within the bay to light a two-dimensional area on the one side of the optical panel. The backlight unit also comprises a bracket for quick installation and removal of the light emitting structure through the aperture to and from the bay.
    Type: Application
    Filed: May 19, 2004
    Publication date: November 25, 2004
    Applicant: NEC LCD Technologies, Ltd.
    Inventors: Shin-ichirou Ono, Hirokazu Fukuyoshi
  • Publication number: 20040233355
    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: Application
    Filed: June 15, 2004
    Publication date: November 25, 2004
    Applicants: NEC CORPORATION, NEC LCD TECHNOLOGIES, LTD
    Inventors: Masayoshi Suzuki, Teruaki Suzuki, Toshiya Ishii
  • Publication number: 20040233366
    Abstract: In a liquid-crystal display element each individual liquid-crystal injection area is surrounded by a seal, and the overall liquid-crystal injection area is surrounded by an array substrate and an opposing substrate surrounded by an outer peripheral seal having an aperture and are adhered together, the aperture of the outer peripheral seal being sealed by a hole sealant, and the surface of at least one of the array substrate and the opposing substrate being polished with a polishing material, which is then removed, after which cutting along the aperture is done to separate the individual liquid-crystal injection areas, thereby facilitating the achievement of a thin liquid-crystal display element, while improving the quality and yield thereof.
    Type: Application
    Filed: June 29, 2004
    Publication date: November 25, 2004
    Applicant: NEC LCD Technologies, Ltd.
    Inventors: Hirofumi Kamosawa, Takeya Shimizu
  • Publication number: 20040233356
    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: Application
    Filed: June 15, 2004
    Publication date: November 25, 2004
    Applicants: NEC CORPORATION, NEC LCD TECHNOLOGIES, LTD
    Inventors: Masayoshi Suzuki, Teruaki Suzuki, Toshiya Ishii
  • Patent number: 6822712
    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: August 27, 2001
    Date of Patent: November 23, 2004
    Assignees: NEC Corporation, NEC LCD Technologies, Ltd.
    Inventors: Masayoshi Suzuki, Teruaki Suzuki, Toshiya Ishii
  • Patent number: 6822704
    Abstract: An active matrix liquid crystal display device which has color filters disposed on a TFT (Thin-Film Transistor) substrate, and which reduces the effect of light leakage regions over data lines for an increased viewing angle. The liquid crystal display device has the data lines disposed on the TFT substrate at respective gaps between adjacent two of pixel electrodes, for supplying data signals to TFTs to drive pixel electrodes, and a black matrix disposed on the TFT substrate in association with the data lines for blocking light passing in a predetermined viewing angle range through a light leakage region created in the liquid crystal layer depending on a potential difference between adjacent two of the pixel electrodes.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: November 23, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Michiaki Sakamoto, Muneo Maruyama, Yuji Yamamoto, Mamoru Okamoto
  • Patent number: 6819371
    Abstract: In a flat panel display device, in which a display panel 1 loosely fitted on a main surface of a chassis 4 and circuit substrates held in hook portions provided on side surfaces of the chassis are connected each other through TCP's by bending the latter TCP's, and a method for manufacturing the same device, a main slit for a rounded portion of each TCP is formed in a rounded portion of the TCP and an auxiliary sub slit is also formed adjacent to the main slit. In order to reduce the peeling force exerted on connecting/fixing portions between the TCP's and the display panel, the circuit substrate is pulled up by bending the main and sub slits and then returning the sub slit to a flat state to insert the circuit substrate into the hook portions.
    Type: Grant
    Filed: July 9, 2003
    Date of Patent: November 16, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Tsutomu Kanatsu
  • Publication number: 20040222960
    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: Application
    Filed: June 15, 2004
    Publication date: November 11, 2004
    Applicants: NEC CORPORATION, NEC LCD TECHNOLOGIES, LTD
    Inventors: Masayoshi Suzuki, Teruaki Suzuki, Toshiya Ishii
  • Patent number: 6815269
    Abstract: A thin-film transistor is formed by a polycrystalline silicon film having a thin-film part and a thick-film part, the thin-film part minimally being used as a channel part. The polycrystalline silicon film is formed by laser annealing with an energy density that completely melts the thin-film part but does not completely melt the thick-film part. Because large coarse crystal grains growing from the boundary between the thin-film part and the thick-film part form the channel part, it is possible to use a conventional laser annealing apparatus to easily achieve high carrier mobility and low leakage current and the like.
    Type: Grant
    Filed: May 6, 2003
    Date of Patent: November 9, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Hiroshi Okumura
  • Patent number: 6816213
    Abstract: The present invention provides a mounting structure for mounting a liquid crystal module to a cover of a mobile terminal. The mounting structure comprises: at least a pair of first and second engagement parts, wherein the first engagement part is provided on a side portion of the liquid crystal module, while the second engagement part is provided on a side portion of a structural member of the cover, so that the paired first and second engagement parts are engaged with each other only by fitting the liquid crystal module into the structural member of the cover.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: November 9, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Kasuhiro Kato, Masatake Baba, Michiaki Nishiyama, Fumihiko Fujishiro, Takakazu Yano, Toshihisa Ogawa, Tomoo Miwa, Yasuhiro Sato