Patents Assigned to NEC LCD Technologies
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Patent number: 7623215Abstract: A method of manufacturing a liquid crystal panel, in which a first seal for surrounding a display area is formed on one of a pair of substrates opposite to each other; a second seal for forming a reduced-pressure area is formed outside the display area; a liquid crystal material is dropped in a reduced-pressure state; thereafter, the other substrate is adhered thereto; and the first and second seals are hardened while pushing the substrates from the outsides thereof in an atmospheric pressure state, thus sealing the liquid crystal material. A dropped area of the liquid crystal material is defined satisfy: 2.5b?a?5b where “a” is an interval between an internal peripheral portion of the first seal and an external peripheral portion, and “b” is an interval between an external peripheral portion of the first seal and an internal peripheral portion of the second seal.Type: GrantFiled: October 8, 2004Date of Patent: November 24, 2009Assignee: NEC LCD Technologies, Ltd.Inventor: Toshihiko Motomatsu
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Patent number: 7623204Abstract: A reflection type liquid crystal display device having excellent display capability even if the number of the photolithography process is reduced and a process for producing the device. A process includes the steps of (a) forming a source/drain wiring by using a first mask; (b) forming a thin film transistor region and gate wiring by using a second mask; (c) forming an opening for a transistor, in a passivation film by using a third mask; (d) forming a rough surface of the interlayer insulating film and to form an opening for the transistor by using a fourth mask by halftone exposure, and (e) forming a reflective metal which extend through the respective openings for the transistor in the passivation film and the interlayer insulating film so that it is electrically connected to the source wiring by using a fifth mask.Type: GrantFiled: August 15, 2006Date of Patent: November 24, 2009Assignee: NEC LCD Technologies Ltd.Inventors: Hiroshi Sakurai, Hidenori Ikeno, Yuichi Yamaguchi, Hiroshi Kano
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Publication number: 20090284704Abstract: A lateral electric field type LCD device displays images uniformly and stably, where abnormally displayed areas caused by mechanical deformation such as a press with a finger do not remain on the display screen for a long time. A first liquid crystal driving electrode and a second liquid crystal driving electrode comprise a first bend and a second bend, respectively. Each pixel region is divided into a first sub-region and a second sub-region by the first and second bends as a boundary in such a way that a rotation direction of liquid crystal molecules in the first sub-region is different from that in the second sub-region. A boundary stabilization electrode is formed at least one of the first and second bends, wherein a shape or position of the boundary stabilization electrode deviates from a line of symmetry of the first and second bends.Type: ApplicationFiled: May 12, 2009Publication date: November 19, 2009Applicant: NEC LCD TECHNOLOGIES, LTD.Inventor: Teruaki Suzuki
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Publication number: 20090286374Abstract: A base layer is formed on an insulating substrate, and a semiconductor layer is formed in localized fashion thereon. A gate insulating film is then formed so as to cover the semiconductor layer, and a gate electrode is formed on a portion of the gate insulating film. An impurity is then implanted into the semiconductor layer via the gate insulating film, and a source region, a drain region, and an LDD region are formed. The gate insulating film is etched with dilute hydrofluoric acid. An electrode-protecting insulating film is then formed so as to cover the gate electrode, and the entire surface of the surface layer portion of the electrode-protecting insulating film is etched away using dilute hydrofluoric acid. Carrier traps introduced into the electrode-protecting insulating film and the gate insulating film are thereby removed.Type: ApplicationFiled: July 24, 2009Publication date: November 19, 2009Applicants: NEC CORPORATION, NEC LCD TECHNOLOGIES, LTDInventors: Shigeru MORI, Takahiro KORENARI, Tadahiro MATSUZAKI, Hiroshi TANABE
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Patent number: 7619710Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode each associated to a pixel to be driven, a common electrode to which a reference voltage is applied, data lines, a scanning line, and common electrode lines. Molecular axes of liquid crystal are rotated in a plane parallel with the first substrate by an electric field substantially parallel with a plane of the first substrate to thereby display certain images. The common electrode is composed of transparent material and are formed on a layer located closer to the liquid crystal layer than the data lines. The common electrode entirely overlaps the data lines except an area where the data lines are located in the vicinity of the scanning line.Type: GrantFiled: April 1, 2005Date of Patent: November 17, 2009Assignee: NEC LCD Technologies, Ltd.Inventors: Shinichi Nishida, Kimikazu Matsumoto, Takahisa Hannuki, Kunimasa Itakura
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Patent number: 7619255Abstract: A layer-stacked wiring made up of a microcrystalline silicon thin film and a metal thin film is provided which is capable of suppressing an excessive silicide formation reaction between the microcrystalline silicon thin film and metal thin film, thereby preventing peeling of the thin film. In a polycrystalline silicon TFT (Thin Film Transistor) using the layer-stacked wiring, the microcrystalline silicon thin film is so configured that its crystal grains each having a length of the microcrystalline silicon thin film in a direction of a film thickness being 60% or more of a film thickness of the microcrystalline silicon thin film amount to 15% or less of total number of crystal grains or that its crystal grains each having a length of the microcrystalline silicon thin film in a direction of a film thickness being 50% or less of a film thickness of the microcrystalline silicon thin film amount to 85% or more of the total number of crystal grains making up the microcrystalline silicon thin film.Type: GrantFiled: March 21, 2007Date of Patent: November 17, 2009Assignees: NEC Corporation, NEC LCD Technologies, Ltd.Inventors: Jun Tanaka, Hiroshi Kanoh
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Patent number: 7618881Abstract: A method for forming a thin-film transistor on an insulating substrate includes the steps of: forming a non-single-crystal semiconductor thin film on the insulating substrate; forming a gate insulating film on the non-single-crystal semiconductor thin film; forming a gate electrode including a lower gate electrode and an upper gate electrode on the gate insulating film, the lower gate electrode having a portion that is not covered by the upper gate electrode; forming a source-drain region and an LDD (lightly doped drain) region in the non-single-crystal thin film semiconductor film concurrently by introducing an impurity into the non-single-crystal semiconductor thin film through the gate electrode and the gate insulating film; and etching away an exposed portion of the lower gate electrode by using the upper gate electrode as a mask.Type: GrantFiled: January 19, 2007Date of Patent: November 17, 2009Assignees: NEC Corporation, NEC LCD Technologies, Ltd.Inventor: Tadashi Satou
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Publication number: 20090281754Abstract: Disclosed is a test method an apparatus in which an area for test and an area for analysis are specified based on the design information of the display device having a non-rectangular display area. To carry out testing, parasitic capacitances are found using the design information, and operations for weighting are performed on test data or threshold values based on which a decision on pass/fail is to be made (FIG. 4).Type: ApplicationFiled: May 8, 2009Publication date: November 12, 2009Applicant: NEC LCD Technologies, Ltd.Inventor: Kenichi TAKATORI
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Patent number: 7614758Abstract: A backlight for a color liquid crystal display apparatus includes a first light-guide plate; a first incidence part for receiving light of a first primary color in a first area on a first lateral surface of the first light-guide plate; a second incidence part for receiving light of a second primary color light in a second area on a second lateral surface that is opposite to the first lateral surface of the first light-guide plate; and a third incidence part for receiving light of a third primary color in a third area on a rear surface of the first light-guide plate. The number of superposition steps is thereby reduced, light-guide plates can easily be superposed onto an LCD panel with high accuracy, and a lightweight and inexpensive backlight for a color liquid crystal display apparatus can be obtained.Type: GrantFiled: December 1, 2006Date of Patent: November 10, 2009Assignee: NEC LCD Technologies, Ltd.Inventor: Mitsuasa Takahashi
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Patent number: 7616288Abstract: Disclosed is a method of manufacturing a liquid crystal display device using a liquid crystal dispensation alignment method which includes steps of: removing inorganic ions and the like by performing a vacuum drying process on substrates after cleaning alignment layers on which a rubbing process has been performed; and removing foreign objects by performing any one of a process for sucking up foreign objects by use of a nozzle having a specialized shape and a process for blasting a gas to which ultrasonic waves have been applied against the foreign objects, before liquid crystal is dispensed. In addition, a temperature at which sealing material is cured completely is lowered in order to inhibit activation (migration) of organic matters and to thereby reduce visible defects such as alignment bright defects.Type: GrantFiled: January 19, 2005Date of Patent: November 10, 2009Assignee: NEC LCD Technologies, LtdInventor: Toshihiko Motomatsu
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Patent number: 7612847Abstract: A device is disclosed for generating pattern data for unevenness that is randomly arranged on the surface of the reflective substrate of a reflective liquid crystal display device. The number of coordinates, a basic pitch, a movable range, and a dot diameter are entered from a data entry unit. An array generation unit regularly arranges base coordinates in two dimensions in accordance with the basic pitch. Coordinate displacement unit randomly displaces within the movable range at a portion of the basic coordinates to generate a multiplicity of displaced coordinates. Pattern generation unit arranges dot patterns with the dot diameter entered at each of the displaced coordinates generated to generate pattern data.Type: GrantFiled: September 5, 2002Date of Patent: November 3, 2009Assignees: NEC LCD Technologies, Ltd., NEC CorporationInventors: Hiroshi Kanoh, Teruaki Suzuki
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Patent number: 7612856Abstract: A display device includes: a pair of substrates disposed opposite each other; a conductive seal for sealing the gap of the outer peripheral part between the pair of substrates; an electric optical element disposed in an area defined by the substrates and the seal; a display area, formed on one substrate, having a plurality of pixels for controlling the electric optical element; and a driver circuit for controlling the pixels. The driver circuit is so configured that a circuit element affected by stray capacitance formed between the conductive seal and the driver circuit is disposed apart from the conductive seal.Type: GrantFiled: March 28, 2006Date of Patent: November 3, 2009Assignees: NEC LCD Technologies, Ltd., NEC CorporationInventors: Tomohiko Otose, Koji Shigemura
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Publication number: 20090267969Abstract: There is provided an image display device capable of obtaining a renewed screen giving normal feelings by simple LUT (Look Up Table) adjustment even at a time of displaying with multiple gray levels. A screen of the electronic paper section making up the display device is renewed by driving for a period of time corresponding to a plurality of frames according to input gray level data of a renewed screen. The renewed screen is displayed with a coarse gray level during a first displaying period in a renewing period corresponding to a plurality of frames at an output voltage specified by a high-order bit of its gray level data and, thereafter, is displayed with a fine gray level during a second displaying period in the renewing period at an output voltage specified by a low-order bit of its gray level data.Type: ApplicationFiled: April 16, 2009Publication date: October 29, 2009Applicant: NEC LCD Technologies, Ltd.Inventor: Michiaki SAKAMOTO
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Backlight module with detachable light source unit and liquid crystal display device having the same
Publication number: 20090268124Abstract: A backlight module with a detachable light source unit includes a light guide plate and a light source unit housed in a module case. The light source unit can slide along a lengthwise direction of one end face of the light guide plate. The light source unit is equipped with a U-shaped cover member for holding a plurality of point light sources such as LEDs along a lengthwise direction. The backlight module further includes a coupling member to change a positional relationship between the light guide plate and the light source unit such that a distance between an emitting surface of the LED and an incident plane of the light guide plate during a process of exchanging the light source unit is larger than that between the emitting surface and the incident plane at a time of home position of the light source unit in the module case.Type: ApplicationFiled: February 19, 2009Publication date: October 29, 2009Applicant: NEC LCD Technologies, Ltd.Inventors: Hideki Kujiraoka, Kei Takahashi -
Patent number: 7609350Abstract: A display portion is divided by scan lines and signal lines into sections where pixels are provided. Contact holes each for connecting common wiring and a common electrode together are not formed for all the pixels, but decimated so as to be arranged in zigzags.Type: GrantFiled: September 20, 2006Date of Patent: October 27, 2009Assignee: NEC LCD Technologies, Ltd.Inventors: Shingo Saigo, Takasuke Hayase, Makoto Horinouchi, Hideto Motoshima, Akitoshi Maeda
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Patent number: 7609343Abstract: In a semi-transmissive liquid crystal display device, the thickness of liquid crystal layer in the reflective region can be adjusted by controlling the film thickness of the organic insulating film for reflection and the film thickness of the color layer for reflection. Furthermore, the thickness of liquid crystal layer in the transmissive region can be adjusted by controlling the film thickness of the organic insulating film for transmission and the film thickness of the color layer for transmission. Since the thicknesses of liquid crystal layer in the reflective region and that in the transmissive region can be adjusted, the reflectance in the reflective region and the transmittance in the transmissive region can each be set at the most appropriate values.Type: GrantFiled: November 2, 2005Date of Patent: October 27, 2009Assignees: NEC LCD Technologies, Ltd., NEC CorporationInventors: Michiaki Sakamoto, Osamu Sukegawa, Hidenori Ikeno
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Patent number: 7609354Abstract: Disclosed is a liquid crystal display device that includes a TFT substrate. A plurality of gate lines and a plurality of common lines extend in a first direction on the TFT substrate. Drain lines extend in a second direction substantially perpendicularly to these lines. Bus lines are located outside a display area and are extending parallel to the drain lines. Common line terminals are provided on either side of each block that is constituted by a predetermined number of gate terminals. The common line terminals and the lead lines therefor are formed on the same layer as the drain lines and are connected to the bus lines on the same layer without any contacts being used. Resistance along the routes taken by common lines can be reduced.Type: GrantFiled: March 28, 2005Date of Patent: October 27, 2009Assignee: NEC LCD Technologies, LtdInventors: Takayuki Konno, Satoshi Inada, Yoshiro Kitagawa, Shinichi Nishida
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Publication number: 20090262148Abstract: To provide a hold-type display device having a fine luminance efficiency while suppressing generation of motion blur. A controller according to the invention adjusts a signal outputted to a hold-type image display panel, which includes: a double-speed drive converting part which divides one frame of an inputted video signal to a plurality of sub-frames; a color converting part which converts a video signal of three primary colors including the plurality of sub-frames to a video signal of four or more colors including the three primary colors and a compound color; and a sub-frame converting part which converts, the video signal converted by the color converting part, to a signal having a plurality of different gradations whose average luminance value becomes equivalent to luminance of the video signal converted by the color converting part, and takes each of the plurality of gradations as each of gradations of the plurality of sub-frames.Type: ApplicationFiled: April 9, 2009Publication date: October 22, 2009Applicant: NEC LCD Technologies, Ltd.Inventor: Hiroaki KIMURA
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Patent number: 7604487Abstract: A device includes a chassis and a flexible printed circuit. The flexible printed circuit has a terminal portion which is disposed so as to overlap with a mounted area of a circuit board mounted on a surface of the chassis. The device includes a connection auxiliary member which is disposed on the surface of the chassis at a position close to the terminal portion. The connection auxiliary member includes a fixed portion fixed to the surface of the chassis and a deformed portion connected to the fixed portion. The deformed portion deforms so that a part thereof rises from the surface of the chassis by pushing the deformed portion toward the fixed portion to lift up the terminal portion of the flexible printed circuit from the surface of the chassis.Type: GrantFiled: January 25, 2008Date of Patent: October 20, 2009Assignee: NEC LCD Technologies, Ltd.Inventor: Kei Takahashi
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Publication number: 20090257119Abstract: A translucent liquid crystal display panel (2) includes pixel pairs as display units each formed by a left-eye pixel (4L) and a right-eye pixel (4R) and arranged in a matrix shape. A through hole (4Ld) arranged in a color layer (4Lc) of a color filter has a slit shape whose longitudinal direction is identical to the orientation direction of a cylindrical lens (3a) constituting a lenticular lens (3). Similarly, a through hole (4Rd) arranged in a color layer (4Rc) of a color filter has a slit shape whose longitudinal direction is identical to the orientation direction of the cylindrical lens (3a) constituting the lenticular lens (3). This suppresses the phenomenon that a hue is changed by a field-of-view angle and/or an external light condition on the translucent display panel capable of displaying an image directed to a plurality of viewpoints.Type: ApplicationFiled: June 27, 2007Publication date: October 15, 2009Applicant: NEC LCD TECHNOLOGIES, LTD.Inventor: Shin-ichi Uehara