Patents by Inventor Mitsuhiro Shigeta
Mitsuhiro Shigeta has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7522127Abstract: Out of two display pixels connected to the same gate line G2, a display pixel (A) is connected to a source line S2, and a display pixel (B) is connected to a source line S3, which is adjacent to the source line S2 and forms a parasitic capacitance with a pixel electrode of the display pixel (A). A write signal for a display pixel (A) is obtained by correcting an input signal for the display pixel (A) in accordance with an input signal for a display pixel (B) or a write signal for the display pixel (B). With this arrangement, it is possible to reduce crosstalk between the two display pixels in a display device, such as a liquid crystal display device, that drives display pixels through a plurality of source lines and a plurality of gate lines.Type: GrantFiled: December 16, 2004Date of Patent: April 21, 2009Assignee: Sharp Kabushiki KaishaInventors: Tatsuya Nakamoto, Makoto Shiomi, Mitsuhiro Shigeta
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Patent number: 7508366Abstract: A display has a circuit for comparing video data for a first or current frame with video data for a second or desired frame. A processing section makes an instruction for a process to take place if certain conditions are met. In response to the instruction for a process, a signal generation circuit outputs a signal which reduces a degree of modulation or variation by which tone transition is facilitated relatively to a case where pixels are driven on the basis of data output from an ordinary processing section. Thus, by modulating or varying a drive signal to a degree suitable for a case where tone transition is sufficient, a display capable of improving display quality even in a situation where the display is not capable of being driven suitably, can be realized using circuitry of a relatively small scale.Type: GrantFiled: October 7, 2003Date of Patent: March 24, 2009Assignee: Sharp Kabushiki KaishaInventors: Makoto Shiomi, Kazunari Tomizawa, Koichi Miyachi, Mitsuhiro Shigeta
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Publication number: 20080043027Abstract: In cases where the amount of gradation transition is greater than a threshold value, a modulation processing section corrects image data D of a current frame by making an interpolation calculation with reference to a look-up table, and output the image data D thus corrected. In cases where the amount of gradation transition is not more than the threshold value, the modulation processing section directly outputs the image data D of the current frame.Type: ApplicationFiled: December 8, 2005Publication date: February 21, 2008Inventors: Makoto Shiomi, Mitsuhiro Shigeta, Kazunari Tomizawa
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Patent number: 7277076Abstract: In a method for driving a display, a display, and a program therefor, a memory stores uncorrected video data for a desired frame and for a current frame until a next frame. Meanwhile, a correction section reads uncorrected video data for the previous frame and the current frame from the memory and corrects the video data for the current frame. Further, a processing section corrects video data for the next frame based on the corrected video data for current frame so as to facilitate a grayscale level transition from the current frame to the next frame.Type: GrantFiled: December 24, 2003Date of Patent: October 2, 2007Assignee: Sharp Kabushiki KaishaInventors: Makoto Shiomi, Kazunari Tomizawa, Koichi Miyachi, Mitsuhiro Shigeta
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Patent number: 7038647Abstract: A liquid crystal display apparatus includes an applied gradation value acquiring section for receiving gradation data of a frame to be displayed, gradation data of a frame to be outputted, gradation data of the current frame supplied from a frame memory and measured data from a temperature sensor. An interpolation operation is then carried out in reference to look-up tables stored in a look-up table memory so as to calculate a target applied gradation data required for gradation display.Type: GrantFiled: March 11, 2003Date of Patent: May 2, 2006Assignee: Sharp Kabushiki KaishaInventors: Mitsuhiro Shigeta, Makoto Shiomi, Kazunari Tomizawa, Hidekazu Miyata
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Publication number: 20050190610Abstract: A driving system of the present invention for use in a displaying device is provided with a pseudo bit-depth extension section. In the pseudo bit-depth extension section, a noise pattern is added to upper-n-bit data of an input signal D0 in m-bit, where (i) m is an integer of 9 or greater, and (ii) n is an integer of 8 or greater, but less than m. Then, upper-n-bit of data D1 thus obtained from the D0 is outputted, as output data D2, from the pseudo bit-depth extension section. The driving system is further provided with an overshoot-driving section for carrying out an overshoot-driving with respect to each of pixels. A noise amount of the noise pattern is 1 or less in 8-bit data, and a calculation in the overshoot-driving section is carried out with n-bit data.Type: ApplicationFiled: February 25, 2005Publication date: September 1, 2005Inventors: Tomoo Furukawa, Makoto Shiomi, Tai Shiraishi, Mitsuhiro Shigeta
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Publication number: 20050168424Abstract: Out of two display pixels connected to the same gate line G2, a display pixel (A) is connected to a source line S2, and a display pixel (B) is connected to a source line S3, which is adjacent to the source line S2 and forms a parasitic capacitance with a pixel electrode of the display pixel (A). A write signal for a display pixel (A) is obtained by correcting an input signal for the display pixel (A) in accordance with an input signal for a display pixel (B) or a write signal for the display pixel (B). With this arrangement, it is possible to reduce crosstalk between the two display pixels in a display device, such as a liquid crystal display device, that drives display pixels through a plurality of source lines and a plurality of gate lines.Type: ApplicationFiled: December 16, 2004Publication date: August 4, 2005Inventors: Tatsuya Nakamoto, Makoto Shiomi, Mitsuhiro Shigeta
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Publication number: 20040155893Abstract: An evaluation apparatus of a liquid crystal display device in accordance with the present invention is provided with a signal section for supplying a signal to a liquid crystal panel to be evaluated; a display detection section for sensing a display state on the liquid crystal panel; an analysis section for analyzing a detection result of the display detection section. The signal section supplies to the liquid crystal panel a signal corresponding to an original tone and then, in accordance with tone transition from the original tone to an attainment tone, either (i) an overshoot test signal or (ii) both an overshoot test signal and an undershoot test signal in test driving, while sweeping either a level of the signal (i) or levels of both the signals (ii).Type: ApplicationFiled: February 9, 2004Publication date: August 12, 2004Inventors: Tomoo Furukawa, Makoto Shiomi, Mitsuhiro Shigeta
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Publication number: 20040135777Abstract: A display has a circuit for comparing video data for a first or current frame with video data for a second or desired frame. A processing section makes an instruction for a process to take place if certain conditions are met. In response to the instruction for a process, a signal generating circuit outputs a signal which reduces a degree of modulation or variation by which tone transition is facilitated relatively to a case where pixels are driven on the basis of data output from an ordinary processing section. Thus, by modulating or varying a drive signal to a degree suitable for a case where tone transition is sufficient, a display capable of improving display quality even in a situation where the display is not capable of being driven suitably, can be realized using circuitry of a relatively small scale.Type: ApplicationFiled: October 7, 2003Publication date: July 15, 2004Inventors: Makoto Shiomi, Kazunari Tomizawa, Koichi Miyachi, Mitsuhiro Shigeta
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Publication number: 20040135800Abstract: In a method for driving a display, a display, and a program therefor, a memory stores uncorrected video data for a desired frame and for a current frame until a next frame. Meanwhile, a correction section reads uncorrected video data for the previous frame and the current frame from the memory and corrects the video data for the current frame. Further, a processing section corrects video data for the next frame based on the corrected video data for current frame so as to facilitate a grayscale level transition from the current frame to the next frame.Type: ApplicationFiled: December 24, 2003Publication date: July 15, 2004Inventors: Makoto Shiomi, Kazunari Tomizawa, Koichi Miyachi, Mitsuhiro Shigeta
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Publication number: 20030179175Abstract: A liquid crystal display apparatus includes an applied gradation value acquiring section for receiving gradation data of a frame to be displayed, gradation data of a frame to be outputted, gradation data of the current frame supplied from a frame memory and measured data from a temperature sensor. An interpolation operation is then carried out in reference to look-up tables stored in a look-up table memory so as to calculate a target applied gradation data required for gradation display.Type: ApplicationFiled: March 11, 2003Publication date: September 25, 2003Inventors: Mitsuhiro Shigeta, Makoto Shiomi, Kazunari Tomizawa, Hidekazu Miyata
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Patent number: 6480253Abstract: To manufacture at a good yield a large-screen display having low resistivity of wires and excelling in flatness of substrates, a metal material, a transparent electrode material, and a conductive resin are used for forming either scanning electrodes or signal electrodes, or both of the same. Not less than two materials are used as the metal material, while amorphus ITO is used as the transparent electrode material. An electrode substrate has electrode structures in each of which a metal wire made of the foregoing metal material, a transparent electrode made of the foregoing transparent electrode material, and a conductive resin layer are laminated in this order on a transparent substrate. Conductivity is imparted to the conductive resin layers by conductive particles electrodeposited by the micell electrolytic method.Type: GrantFiled: July 27, 1999Date of Patent: November 12, 2002Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Mitsuhiro Shigeta, Hideki Uchida, Masahiko Tomikawa, Hisashi Akiyama, Nobuyuki Itoh, Shuji Miyoshi
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Patent number: 6452659Abstract: A liquid crystal display device includes a transparent substrate provided with a plurality of stripe scanning electrodes, and another substrate provided with a plurality of stripe signal electrodes orthogonal to the scanning electrodes, and a liquid crystal layer enclosed between the two transparent substrates. The scanning electrodes are provided on the transparent substrate via a color filter, under overcoat film, and a hard coat film made of hard silicon resin. In the hard coat film, in order to reduce electrode resistance of the scanning electrodes, there are provided a plurality of metal electrodes which are electrically connected individually to the scanning electrodes. The metal electrodes are also connected to the signal electrodes in the same manner as the scanning electrodes.Type: GrantFiled: April 20, 1998Date of Patent: September 17, 2002Assignees: Sharp Kabushiki Kaisha, The Secretary of State for in Her Brittanic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Hisashi Akiyama, Mitsuhiro Shigeta
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Patent number: 6310595Abstract: A plurality of signal electrodes and scanning electrodes are provided on each of a pair of glass substrates facing each other, and pixels are formed at intersections of the signal electrodes and the scanning electrodes, and a liquid crystal layer is formed between the pair of glass substrates. A resistance value R of a single signal electrode or a single scanning electrode, an electric capacity C between the single signal electrode and one of the pair of glass substrates facing the single signal electrode, and a pulse width &tgr; of a driving signal applied to the signal electrode or to the scanning electrode are set so as to satisfy a relationship 0.001≦RC/&tgr;≦0.5.Type: GrantFiled: December 21, 1998Date of Patent: October 30, 2001Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventor: Mitsuhiro Shigeta
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Patent number: 6295112Abstract: A method of aligning a liquid crystal includes a step of fixing on a hot plate and heating a liquid crystal cell in which a liquid crystal composed of a ferroelectric liquid crystal material sealed between electrode substrates respectively having alignment films having applied thereto a uniaxial alignment by rubbing. According to the described method, a pressure is applied to the liquid crystal cell by a roller, and a portion subjected to an application of pressure is moved by moving the roller. Further, the liquid crystal is heated within a temperature range between a phase transition temperature of SmA phase SmC* phase and a temperature 10° C. below the phase transition temperature, and the portion subjected to an application of pressure is moved in the same direction as the rubbing direction, thereby achieving the C2 orientation at higher yield.Type: GrantFiled: April 23, 1997Date of Patent: September 25, 2001Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defense in her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Masaaki Kabe, Takashi Kaneko, Mitsuhiro Koden, Mitsuhiro Shigeta, Nobuyuki Itoh
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Patent number: 6288766Abstract: A liquid crystal injecting device has a jig which seals an opening used as a liquid crystal inlet of the cell and another opening used as an air outlet of the cell separately. When obtaining a liquid crystal element by injecting liquid crystal into the cell, the liquid crystal is applied to the inlet before the injection, and after an internal pressure of the cell is reduced by releasing air from the jig, the liquid crystal is injected to the cell by being supplied to the inlet through a liquid crystal supplying tube. During the injection, a temperature of the cell is set to a temperature at which the liquid crystal takes a nematic, cholesteric, or isotropic phase, while air is kept being released. When the injection ends, the liquid crystal is further applied to the inlet and outlet, while being reinjected into the cell through all the openings at room temperature or above under atmospheric pressure or above, after which the cell is cooled.Type: GrantFiled: February 12, 1999Date of Patent: September 11, 2001Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britanic Majesty's Goverment of the United Kingdom of Great Britain and Northern IrelandInventors: Ryutaro Mashiko, Mitsuhiro Shigeta, Tomoo Furukawa, Teiyu Sako, Hirokazu Sasaki
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Patent number: 6266121Abstract: A method of manufacturing a liquid crystal display element includes the steps of (a) forming a spacer having a uniform height on a glass substrate having formed thereon scanning lines, a black matrix, an insulating layer and an alignment layer in an area to which the black matrix is projected in a direction perpendicular to a substrate surface; (b) forming an adhesive layer on a transfer substrate; (c) pressing an upper surface of the spacer against the adhesive layer on the transfer substrate; and (d) selectively applying an adhesive only onto the upper surface of the spacer by the step (c). In the step (a), it is preferable that the spacer be formed so as to have a trapezoidal cross section with respect to a plane perpendicular to the lengthwise direction.Type: GrantFiled: November 24, 1997Date of Patent: July 24, 2001Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Brittanic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Mitsuhiro Shigeta, Hideki Uchida, Kazuhiko Tamai, Shuji Miyoshi, Masami Kido
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Patent number: 6215533Abstract: A ferroelectric liquid crystal device includes a layer of ferroelectric liquid crystal material contained between a pair of substrates, a first plurality of electrodes and a second plurality of electrodes defining a plurality of addressable liquid crystal pixels. A driving arrangement is provided for applying a first signal (Strobe) in succession to the first plurality of electrodes and for applying a plurality of second signals (Data) simultaneously to the second plurality of electrodes. The plurality of second signals are arranged to include non-rectangular wave signals which have a lower harmonic content than a rectangular wave. Non-uniform heating of the device as a result of the application of the second signals (Data) is reduced with consequent improvement in device performance.Type: GrantFiled: May 12, 1997Date of Patent: April 10, 2001Assignee: Sharp Kabushiki KaishaInventors: Mitsuhiro Shigeta, Jonathan Rennie Hughes, Paul Bonnett, Edward Peter Raynes, Akira Tagawa, Michael John Towler, Harry Garth Walton, David Scattergood
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Patent number: 6008877Abstract: A liquid crystal display element comprising a light transmissive substrate (#34), insulating films (#52) formed on the substrate and transparent electrodes (#5) arranged to form predetermined patterns on the insulating films. Conductive lines (#51) are conductively in contact with the transparent electrodes, and each conductive line includes a first layer (#51a) made of indium tin oxide which is adhesive to the substrates. The conductive lines are arranged between the insulating films to form a plane surface with the insulating films.Type: GrantFiled: November 21, 1997Date of Patent: December 28, 1999Assignee: Sharp Kabushiki KaishaInventors: Hisashi Akiyama, Mitsuhiro Shigeta, Kazuyuki Kishimoto, Shuji Miyoshi
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Patent number: 5589961Abstract: An optical wave guide, an optical input device, fabrication methods thereof, and a liquid crystal display apparatus using the optical wave guide and optical input device are disclosed. The optical wave guide includes: a core region having a refractive index n.sub.c through which an optical signal is transmitted; and a cladding layer in which low refractive index layers having a refractive index n.sub.1 and high refractive index layers having a refractive index n.sub.h are alternately deposited. A side face of the core region is covered with the cladding layer, and the refractive indices satisfy conditions of n.sub.1 <n.sub.h, and n.sub.1 <n.sub.c. The optical input device includes: a transparent substrate; the optical wave guide formed in the transparent substrate; an optical input portion; and a plurality of optical output portions for connecting a side face of the optical wave guide to a surface of the transparent substrate.Type: GrantFiled: May 24, 1995Date of Patent: December 31, 1996Assignee: Sharp Kabushiki KaishaInventors: Mitsuhiro Shigeta, Keisaku Nonomura