Patents Assigned to NEC LCD Technologies
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Patent number: 7300828Abstract: 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: GrantFiled: April 26, 2006Date of Patent: November 27, 2007Assignee: NEC LCD Technologies. Ltd.Inventors: Hideto Motoshima, Hisanobu Shimodozono, Junji Nishimoto, Makoto Horinouchi, Shouichi Sonohata
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Patent number: 7301588Abstract: An optical unit comprises a frame. A light conductive plate is combined with the frame only and stationary relative thereto.Type: GrantFiled: March 3, 2003Date of Patent: November 27, 2007Assignee: NEC LCD Technologies, Ltd.Inventor: Toshihisa Ogawa
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Publication number: 20070269938Abstract: 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: ApplicationFiled: May 14, 2007Publication date: November 22, 2007Applicants: NEC CORPORATION, NEC LCD Technologies, Ltd.Inventor: Kenichi Hayashi
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Patent number: 7298358Abstract: 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: GrantFiled: September 21, 2004Date of Patent: November 20, 2007Assignee: NEC LCD Technologies, Ltd.Inventor: Nobuaki Honbo
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Patent number: 7291283Abstract: 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: GrantFiled: November 12, 2003Date of Patent: November 6, 2007Assignee: NEC LCD Technologies, Ltd.Inventors: Tadanori Uesugi, Shigeru Kimura
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Publication number: 20070249134Abstract: 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: ApplicationFiled: April 19, 2007Publication date: October 25, 2007Applicants: NEC CORPORATION, NEC LCD Technologies, Ltd.Inventors: MITSURU NAKATA, Hirofumi Shimamoto, Hiroshi Kanoh
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Patent number: 7280178Abstract: 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: GrantFiled: December 9, 2004Date of Patent: October 9, 2007Assignee: NEC LCD Technologies, Ltd.Inventor: Yoshiaki Hashimoto
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Patent number: 7277152Abstract: A TFT and a passivation film are formed on a transparent substrate and thereafter the passivation film is annealed. When measuring drain currents of a TFT at a fixed turn-on voltage (Von) and a fixed turn-off voltage (Voff), although performance of a TFT annealed (solid line) rarely changes, performance of a TFT not annealed (dashed line) changes to a large extent, in more detail, drain current drastically decreases in accordance with the change of TFT performance. This phenomenon means that on-resistance of a TFT not annealed is being increased to a great extent.Type: GrantFiled: June 18, 2002Date of Patent: October 2, 2007Assignees: NEC Corporation, NEC LCD Technologies, Ltd.Inventors: Michiaki Sakamoto, Yuichi Yamaguchi
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Publication number: 20070216841Abstract: A pixel region between a common electrode and a pixel electrode is composed of a principal portion in which the direction of extension of the common electrode and the pixel electrode is parallel with the initial alignment direction of the liquid crystal molecules, and a specific portion not parallel with the initial alignment direction of the liquid crystal molecules. In the specific portion, the distal portion of the pixel electrode and the basal portion of the common electrode are mutually parallel and inclined by a prescribed angle with respect to the initial alignment direction of the liquid crystal molecules. When voltage is applied across the common electrode and the pixel electrode to generate a horizontal electric field, the horizontal electric field will be perpendicular to the initial alignment direction of the liquid crystal molecules within the principal portion that occupies a major part of a column, whereas the field will not be perpendicular within the specific portion.Type: ApplicationFiled: March 13, 2007Publication date: September 20, 2007Applicant: NEC LCD Technologies, Ltd.Inventor: Takayuki Konno
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Publication number: 20070214977Abstract: A gravure printing plate is arranged on a stage, and recessions formed in the gravure printing plate are filled with photosensitive ink. The ink fills the recessions by being placed on an end of the gravure printing plate and being wiped with a blade. The gravure printing plate is then heated while the gravure printing plate is irradiated with UV light from the bottom side of the stage, thereby curing the lower stratum of the ink in the recessions. A blanket is then pressed against the gravure printing plate, and rotated to accept the ink filling the recessions. The ink accepted onto the blanket is then transferred to a transparent substrate, effecting printing of the color filter. It is accordingly possible to print a color filter having a color filter layer with a highly accurate pattern configuration, without any contaminant matter being transferred to the color filter layer.Type: ApplicationFiled: March 19, 2007Publication date: September 20, 2007Applicant: NEC LCD Technologies, Ltd.Inventor: Mamoru Okamoto
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Patent number: 7271041Abstract: Prior to converting a non-single crystal material of a semiconductor film into a single crystal material through the use of a laser beam, at least one dopant is introduced into whole of the semiconductor film. Then, the non-single crystal semiconductor film is irradiated with a laser beam to crystallize the semiconductor film. In this case, a ratio between quasi-fermi level of the single crystal material within one of transistor formation regions used to form transistors of different conductivity types and quasi-fermi level of the single crystal material within the other thereof is made to be between 0.5:1 and 2.0:1. Thus, transistors of different conductivity types are formed in the crystallized semiconductor film.Type: GrantFiled: April 11, 2005Date of Patent: September 18, 2007Assignee: NEC LCD Technologies, Ltd.Inventor: Mitsuasa Takahashi
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Patent number: 7259820Abstract: In an active matrix type liquid crystal display device in which a common electrode and a second pixel electrode have portions opposing each other, and an electric field parallel to substrates is formed between the two electrodes, Y direction extending portions of the common electrode are provided above data lines via a second interlayer insulation film. Slits are opened in the Y direction extending portions of the common electrode along the data lines. Portions of a black matrix which are set to a common electric potential with the common electrode are provided on an opposing substrate at positions opposing the slits.Type: GrantFiled: March 16, 2004Date of Patent: August 21, 2007Assignee: NEC LCD Technologies, Ltd.Inventor: Kimikazu Matsumoto
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Publication number: 20070171352Abstract: A multi-domain alignment liquid crystal display device in which liquid crystal molecules are aligned through a simple process and panel gap is maintained in stable fashion includes a first plate having a thin-film transistor provided at each point of intersection of a scanning line and signal line, a pixel electrode connected to the thin-film transistor and a first orientation layer formed on the pixel electrode and defining a curved surface, and a second plate having RGB color layers, an counterelectrode provided so as to oppose the pixel electrode, and a second orientation layer. A columnar spacer for regulating the panel gap is provided between the two opposing plates, and liquid crystal is sandwiched between the two plates and subjected to multi-domain alignment by the first orientation layer having the curved surface and the columnar spacer.Type: ApplicationFiled: March 30, 2007Publication date: July 26, 2007Applicant: NEC LCD Technologies, Ltd.Inventor: Hiroaki Matsuyama
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Patent number: 7248328Abstract: An IPS (In-Plane-Switching) liquid crystal display panel has column spacers for spacing an active matrix substrate structure from a counter substrate structure, and liquid crystal fills the gap therebetween, wherein the ratio of total contact area between the column spacers and the active matrix substrate structure to the total area occupied by the pixels is fallen within the range from 0.050 percent to 0.150 percent so as to prevent the liquid crystal display panel from irregularity of brightness by keeping the gap constant.Type: GrantFiled: October 12, 2000Date of Patent: July 24, 2007Assignee: NEC LCD Technologies, Ltd.Inventor: Hideo Shibahara
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Patent number: 7245337Abstract: A reflection electrode has an undulated shape and whose normal direction is distributed unevenly to a specific azimuth angle and whose reflection light intensity depends on said azimuth angle. Openings are formed in that area of the reflection electrode which has a tilt angle of 0 degree to 2 degrees and/or a tilt angle of 10 degrees or higher. The retardation of a liquid crystal layer is changed by making the liquid crystal molecular alignment mode different between the openings and the reflection electrode, so that the intensity of output light is increased in reflection mode as well as in transmission mode. The balance of colors displayed in transmission mode is determined by determining the area of the openings in pixels of each color, and the color temperature is set higher in transmission mode than in reflection mode. This provides a semi-transmission type liquid crystal display which has an excellent visibility in reflection mode as well as in transmission mode.Type: GrantFiled: October 17, 2005Date of Patent: July 17, 2007Assignee: NEC LCD Technologies, Ltd.Inventors: Hidenori Ikeno, Masayoshi Suzuki, Youichi Murayama, Michiaki Sakamoto, Fumihiko Matsuno, Hironori Kikkawa, Yuichi Yamaguchi
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Patent number: 7245343Abstract: To provide a liquid crystal device a liquid crystal display having a high contrast over wide viewing angles while reducing the color distortion. A liquid crystal display device comprises a first substrate on which a plurality of pixel electrodes are formed, a second substrate on which an opposing electrode is formed, and a liquid crystal layer sandwiched between the first and second substrates, the second substrate further having thereon a plurality of protrusions, each of the protrusions being positioned at a substantially central portion of a corresponding one of the pixel electrodes.Type: GrantFiled: December 14, 2001Date of Patent: July 17, 2007Assignee: NEC LCD Technologies, Ltd.Inventors: Masayoshi Suzuki, Toshiya Ishii, Seiji Suzuki, Hiroaki Matsuyama, Kiyomi Kawada, Yoshihiko Hirai
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Patent number: 7242450Abstract: The circumferential dimension of the rubbing cloth 1 is set to one half or below of the circumferential dimension of the rotational roll 2a, the excentric core irregularities produced by the seam of the rubbing roll 2 are made visually unrecognizable, and the circumferential dimension of the rubbing cloth 1 is reduced, thus reducing the rubbing density and preventing the scraping-off of the orientation film.Type: GrantFiled: September 1, 2004Date of Patent: July 10, 2007Assignee: NEC LCD Technologies, Ltd.Inventor: Chikaaki Mizoguchi
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Publication number: 20070153539Abstract: Color non-uniformity due to LED light sources of a liquid crystal display (LCD) device is improved. A light quantity control film is arranged between an LED source and the entrance surface of a mixing light guide plate. This light quantity control film is arranged in the part which reduces the quantity of light of the LED with the strongest light quantity among a plurality of same colors.Type: ApplicationFiled: December 29, 2006Publication date: July 5, 2007Applicant: NEC LCD Technologies, Ltd.Inventor: Kazuaki Mikami
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Patent number: 7237923Abstract: A backlight unit includes a lamp housing, a plurality of elongate lamps received therein, and a cooling member having a heat-absorbing part and a heat-radiating part. The heat-absorbing part includes a plurality elongate heat-absorbing portions having a light reflecting function and arranged alternately with the elongate lamps. The heat-radiating part extends from the elongate heat-absorbing portions of the heat-absorbing part and is disposed outside the lamp housing. The cooling member has a heat-radiation function as well as a luminescence assistance function.Type: GrantFiled: April 19, 2005Date of Patent: July 3, 2007Assignee: NEC LCD Technologies, Ltd.Inventor: Shin-Ichirou Ono
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Publication number: 20070132676Abstract: A backlight for a color liquid crystal display apparatus in which light of the three primary colors of red, blue, and green is directly incident on the corresponding pixels of a liquid crystal layer, the backlight comprising a first light-guide plate; a first incidence part for receiving light of a first primary color from among the light of the three primary colors 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 from among the light of the three primary colors 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 from among the light of the three primary colors in a third area on a rear surface of the first light-guide plate.Type: ApplicationFiled: December 1, 2006Publication date: June 14, 2007Applicant: NEC LCD Technologies, Ltd.Inventor: Mitsuasa TAKAHASHI