Patents by Inventor Satoru Tsunekawa
Satoru Tsunekawa 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: 7098881Abstract: A fast-write, high picture-quality LCD (Liquid Crystal Display) compatible with a high-resolution, large-sized liquid crystal panel. An output amplifier circuit of a liquid crystal driver circuit includes an amplifier configuration, which functions as an amplifier that amplifies the predetermined gray-scale voltage for output and as an amplifier that buffers the predetermined gray-scale voltage and outputs with no amplification, and a circuit for switching the above two types of amplifiers. In each horizontal period, a liquid crystal panel is driven by the amplified output for a predetermined period and by the buffered output for the rest of the period. A precharge control circuit is provided to check whether the gray-scale voltage is to be amplified depending upon display data.Type: GrantFiled: October 20, 2003Date of Patent: August 29, 2006Assignee: Hitachi, Ltd.Inventors: Hiroyuki Nitta, Kazuyoshi Kawabe, Satoru Tsunekawa, Hirobumi Koshi
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Publication number: 20040080522Abstract: A fast-write, high picture-quality LCD (Liquid Crystal Display) compatible with a high-resolution, large-sized liquid crystal panel. An output amplifier circuit of a liquid crystal driver circuit includes an amplifier configuration, which functions as an amplifier that amplifies the predetermined gray-scale voltage for output and as an amplifier that buffers the predetermined gray-scale voltage and outputs with no amplification, and a circuit for switching the above two types of amplifiers. In each horizontal period, a liquid crystal panel is driven by the amplified output for a predetermined period and by the buffered output for the rest of the period. A pre-charge control circuit is provided to check whether the gray-scale voltage is to be amplified depending upon display data.Type: ApplicationFiled: October 20, 2003Publication date: April 29, 2004Inventors: Hiroyuki Nitta, Kazuyoshi Kawabe, Satoru Tsunekawa, Hirobumi Koshi
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Patent number: 6661402Abstract: A fast-write, high picture-quality LCD (Liquid Crystal Display) compatible with a high-resolution, large-sized liquid crystal panel. An output amplifier circuit of a liquid crystal driver circuit includes an amplifier configuration, which functions as an amplifier that amplifies the predetermined gray-scale voltage for output and as an amplifier that buffers the predetermined gray-scale voltage and outputs with no amplification, and a circuit for switching the above two types of amplifiers. In each horizontal period, a liquid crystal panel is driven by the amplified output for a predetermined period and by the buffered output for the rest of the period. A pre-charge control circuit is provided to check whether the gray-scale voltage is to be amplified depending upon display data.Type: GrantFiled: October 30, 2000Date of Patent: December 9, 2003Assignee: Hitachi, Ltd.Inventors: Hiroyuki Nitta, Kazuyoshi Kawabe, Satoru Tsunekawa, Hirobumi Koshi
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Patent number: 6633273Abstract: An information processing system includes a bus, a display data generating circuit coupled to the bus, and a display apparatus coupled to the bus. The display apparatus includes a display panel capable of displaying a grayscale image in accordance with display data in a form of a plurality of bits for each of a plurality of pixels of a display panel generated by the display data generating circuit, and a signal driver which supplies driving voltages corresponding to the display data to at least a part of the plurality of data lines to display a grayscale image on the display panel. The signal driver includes a display memory which stores the display data, and is embodied in an integrated circuit. The display data generating circuit transfers the display data to the display memory via the bus.Type: GrantFiled: March 22, 2001Date of Patent: October 14, 2003Assignee: Hitachi, Ltd.Inventors: Makiko Ikeda, Tsutomu Furuhashi, Hiroyuki Nitta, Isao Takita, Naruhiko Kasai, Satoru Tsunekawa, Tatsuhiro Inuzuka
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Patent number: 6625207Abstract: In a low power consumption data transmission circuit and method, and a liquid crystal display apparatus using the same, 24-bit display data is transmitted from a transceiver circuit to a receiver circuit through a transmission line so that the display data is displayed on a liquid crystal panel. The transceiver circuit has a holding circuit including an 8-stage shift register. The transceiver circuit outputs 24-bit data to the transmission line by use of first and second output circuits when data different from data held in the holding circuit is to be transmitted from the transmission line and outputs data indicative of a hold position in the holding circuit from the second output circuit when the same data as that held in the holding circuit is to be transmitted from the transmission line.Type: GrantFiled: September 30, 1999Date of Patent: September 23, 2003Assignees: Hitachi, Ltd., Hitachi Video & Information System, Inc.Inventors: Hiroyuki Nitta, Satoru Tsunekawa, Hirobumi Koshi, Atsuhiro Higa
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Patent number: 6603468Abstract: A liquid crystal display device includes a liquid crystal panel; a plurality of data drivers for applying, to the pixel elements, graduation voltages corresponding to the display data; a gate driver for selecting a pixel element to which a graduation voltage is to be applied; and a liquid crystal control circuit for controlling the data drivers on the basis of a transfer clock. Each data driver includes a reproducing circuit for reproducing the transfer clock input to the data driver such that the deviations between the duties of the display data and the transfer clock input to the data driver and the duties of the display data and the transfer clock output from the data driver become small, and for generating a latch clock, and a latch circuit for latching the display data input to the data driver.Type: GrantFiled: March 2, 2001Date of Patent: August 5, 2003Assignees: Hitachi, Ltd., Hitachi Device EngineeringInventors: Yoshihisa Ooishi, Hiroyuki Nitta, Akihiro Watanabe, Hirobumi Koshi, Satoru Tsunekawa
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Patent number: 6549182Abstract: A display device for displaying display data including a display panel; a driving circuit which generates a gray-scale voltage corresponding to the display data and outputs the gray-scale voltage to the display panel; a scan driver which scans a line on the display panel to which the gray-scale voltage is output; and a control circuit which outputs the display data to the driving circuit and outputs a display control signal to the scan driver. A gray-scale display characteristic of the display data is changeable between a first state in which a difference in a brightness of the display panel between two adjacent display data values becomes smaller as a display data gray-scale increases, and a second state in which the difference in the brightness of the display panel between two adjacent display data values becomes larger as the display data gray-scale increases.Type: GrantFiled: August 14, 2001Date of Patent: April 15, 2003Assignees: Hitachi, Ltd., Hitachi Video and Information Systems, Inc.Inventors: Hiroyuki Nitta, Atsuhiro Higa, Tsutomu Furuhashi, Satoru Tsunekawa, Hiroshi Kurihara
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Patent number: 6448976Abstract: A liquid crystal drive circuit, which makes it possible to display low resolution display data on a high resolution liquid crystal panel while expanding and/or centering the display data, is provided. A multiscan control signal is inputted to a latch address control circuit and a data control circuit to control latch signals and the display data so as to latch single pixel data into a plurality of latches at the same time. The display data are latched with the expanding and/or centering operation, and outputted in synchronization with a line clock after being converted to gray scale voltages. Accordingly, it is possible to realize the lateral expansion and/or the centering operation. Further, it is also possible to realize a longitudinal expansion by adding a latch circuit between a latch circuit and a liquid crystal applied voltage generation circuit, and by outputting the data in synchronization with an expanded line clock.Type: GrantFiled: March 19, 1998Date of Patent: September 10, 2002Assignees: Hitachi, Ltd., Hitachi Video and Information System, Inc.Inventors: Hiroyuki Nitta, Atsuhiro Higa, Masashi Nakamura, Tsutomu Furuhashi, Satoru Tsunekawa, Hiroshi Kurihara
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Patent number: 6396464Abstract: The liquid-crystal display control apparatus provided by the present invention comprises a display RAM unit 21 for storing character codes, character-generator RAM and ROM units 22 and 23 for storing character font patterns and a segment RAM unit 24 for storing picture patterns such as marks and icons. When displaying a character, the following display control is carried out. First of all, a character code is read out from the display RAM unit 21 at a display address generated by a display-address counter 25. The character code is then used in conjunction with a raster address output by a line-address counter 26 for reading out a character font pattern from the character-generator RAM unit 22 or the character-generator ROM unit 23. When displaying a picture pattern such as a mark or an icon, on the other hand, the following display control is carried out. Display control information is read out from the segment RAM unit 24 at an address generated by the display-address counter 25.Type: GrantFiled: June 29, 2001Date of Patent: May 28, 2002Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.Inventors: Yoshikazu Yokota, Satoru Tsunekawa, Kimihiko Sugiyama
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Patent number: 6392619Abstract: In a data transfer circuit, a hold signal generating circuit generates and outputs a hold signal Hold when transmission data is equal to transmission data one cycle before, and sets a 3-state output buffer for transmission data to high-impedance state, while, in a data reception circuit, when the hold signal Hold is valid, a data reception circuit outputs the reception data held, thereby power consumption in a data bus which is terminated with a terminal resistor is reduced.Type: GrantFiled: May 18, 1999Date of Patent: May 21, 2002Assignees: Hitachi, Ltd., Hitachi Video and Information System, Inc., Hitachi Device Engineering Co., Ltd.Inventors: Hiroyuki Nitta, Atsuhiro Higa, Masashi Nakamura, Satoru Tsunekawa, Hirobumi Koshi
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Publication number: 20020027551Abstract: A display device for displaying display data including a display panel; a driving circuit which generates a gray-scale voltage corresponding to the display data and outputs the gray-scale voltage to the display panel; a scan driver which scans a line on the display panel to which the gray-scale voltage is output; and a control circuit which outputs the display data to the driving circuit and outputs a display control signal to the scan driver. A gray-scale display characteristic of the display data is changeable between a first state in which a difference in a brightness of the display panel between two adjacent display data values becomes smaller as a display data gray-scale increases, and a second state in which the difference in the brightness of the display panel between two adjacent display data values becomes larger as the display data gray-scale increases.Type: ApplicationFiled: August 14, 2001Publication date: March 7, 2002Inventors: Hiroyuki Nitta, Atsuhiro Higa, Tsutomu Furuhashi, Satoru Tsunekawa, Hiroshi Kurihara
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Publication number: 20020003533Abstract: A liquid crystal display device includes a liquid crystal panel; a plurality of data drivers for applying, to the pixel elements, graduation voltages corresponding to the display data; a gate driver for selecting a pixel element to which a graduation voltage is to be applied; and a liquid crystal control circuit for controlling the data drivers on the basis of a transfer clock. Each data driver includes a reproducing circuit for reproducing the transfer clock input to the data driver such that the deviations between the duties of the display data and the transfer clock input to the data driver and the duties of the display data and the transfer clock output from the data driver become small, and for generating a latch clock, and a latch circuit for latching the display data input to the data driver.Type: ApplicationFiled: March 2, 2001Publication date: January 10, 2002Inventors: Yoshihisa Ooishi, Hiroyuki Nitta, Akihiro Watanabe, Hirobumi Koshi, Satoru Tsunekawa
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Publication number: 20010035847Abstract: The liquid-crystal display control apparatus provided by the present invention comprises a display RAM unit 21 for storing character codes, character-generator RAM and ROM units 22 and 23 for storing character font patterns and a segment RAM unit 24 for storing picture patterns such as marks and icons. When displaying a character, the following display control is carried out. First of all, a character code is read out from the display RAM unit 21 at a display address generated by a display-address counter 25. The character code is then used in conjunction with a raster address output by a line-address counter 26 for reading out a character font pattern from the character-generator RAM unit 22 or the character-generator ROM unit 23. When displaying a picture pattern such as a mark or an icon, on the other hand, the following display control is carried out. Display control information is read out from the segment RAM unit 24 at an address generated by the display-address counter 25.Type: ApplicationFiled: June 29, 2001Publication date: November 1, 2001Applicant: Hitachi Ltd.Inventors: Yoshikazu Yokota, Satoru Tsunekawa, Kimihiko Sugiyama
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Patent number: 6275207Abstract: There are provided a liquid crystal driving circuit and a liquid crystal display device in which the display brightness and color variation to input display data values can be adjusted. Input display data of one line period are taken into a latch circuit (1) with a latch signal output from a latch address control circuit, and latch circuit (1) data are taken into a latch circuit (2) at the timing of a line clock. Further, the latch circuit (2) data are input to a decode circuit. In accordance with set data output from a set register which sets the set register setting data with a set register setting clock, a gray-scale voltage which is matched with data of each pixel is selected and output as a selection voltage from the decode circuit. The selection voltage is buffered in an amplifying circuit, and then a liquid crystal applying voltage is output.Type: GrantFiled: December 8, 1998Date of Patent: August 14, 2001Assignees: Hitachi, Ltd., Hitachi Video and Information Systems, Inc.Inventors: Hiroyuki Nitta, Atsuhiro Higa, Tsutomu Furuhashi, Satoru Tsunekawa, Hiroshi Kurihara
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Publication number: 20010011988Abstract: An information processing system includes a bus, a display data generating circuit coupled to the bus, and a display apparatus coupled to the bus. The display apparatus includes a display panel capable of displaying a grayscale image in accordance with display data in a form of a plurality of bits for each of a plurality of pixels of a display panel generated by the display data generating circuit, and a signal driver which supplies driving voltages corresponding to the display data to at least a part of the plurality of data lines to display a grayscale image on the display panel. The signal driver includes a display memory which stores the display data, and is embodied in an integrated circuit. The display data generating circuit transfers the display data to the display memory via the bus.Type: ApplicationFiled: March 22, 2001Publication date: August 9, 2001Inventors: Makiko Ikeda, Tsutomu Furuhashi, Hiroyuki Nitta, Isao Takita, Naruhiko Kasai, Satoru Tsunekawa, Tatsuhiro Inuzuka
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Patent number: RE39366Abstract: A liquid crystal driver includes a voltage generator for generating gray scale voltages on the basis of reference voltages, and an output device for selecting one gray scale voltage from the generated gray scale voltages in accordance with display data, for applying inversion/non-inversion control to the selected gray scale voltage with respect to an inversion reference voltage on the basis of the selected gray scale voltage, an AC switching signal and the inversion reference voltage, and for outputting different liquid crystal supply voltages for one and the same display data to a liquid crystal panel.Type: GrantFiled: June 2, 1999Date of Patent: October 31, 2006Assignee: Hitachi, Ltd.Inventors: Hiroyuki Nitta, Hiroyuki Mano, Tsutomu Furuhashi, Isao Takita, Satoru Tsunekawa, Toshio Futami, Makiko Ikeda
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Patent number: RE40916Abstract: A liquid crystal driver includes a voltage generator for generating gray scale voltages on the basis of reference voltages, and an output device for selecting one gray scale voltage from the generated gray scale voltages in accordance with display data, for applying inversion/non-inversion control to the selected gray scale voltage with respect to an inversion reference voltage on the basis of the selected gray scale voltage, an AC switching signal and the inversion reference voltage, and for outputting different liquid crystal supply voltages for one and the same display data to a liquid crystal panel.Type: GrantFiled: October 31, 2007Date of Patent: September 15, 2009Assignee: Hitachi, Ltd.Inventors: Hiroyuki Nitta, Hiroyuki Mano, Tsutomu Furuhashi, Isao Takita, Satoru Tsunekawa, Toshio Futami, Makiko Ikeda
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Patent number: RE40973Abstract: A liquid crystal driver includes a voltage generator for generating gray scale voltages on the basis of reference voltages, and an output device for selecting one gray scale voltage from the generated gray scale voltages in accordance with display data, for applying inversion/non-inversion control to the selected gray scale voltage with respect to an inversion reference voltage on the basis of the selected gray scale voltage, an AC switching signal and the inversion reference voltage, and for outputting different liquid crystal supply voltages for one and the same display data to a liquid crystal panel.Type: GrantFiled: April 19, 2006Date of Patent: November 17, 2009Assignee: Hitachi, Ltd.Inventors: Hiroyuki Nitta, Hiroyuki Mano, Tsutomu Furuhashi, Isao Takita, Satoru Tsunekawa, Toshio Futami, Makiko Ikeda
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Patent number: RE42597Abstract: A liquid crystal driver includes a voltage generator for generating gray scale voltages on the basis of reference voltages, and an output device for selecting one gray scale voltage from the generated gray scale voltages in accordance with display data, for applying inversion/non-inversion control to the selected gray scale voltage with respect to an inversion reference voltage on the basis of the selected gray scale voltage, an AC switching signal and the inversion reference voltage, and for outputting different liquid crystal supply voltages for one and the same display data to a liquid crystal panel.Type: GrantFiled: October 31, 2007Date of Patent: August 9, 2011Assignee: Hitachi, Ltd.Inventors: Hiroyuki Nitta, Hiroyuki Mano, Tsutomu Furuhashi, Isao Takita, Satoru Tsunekawa, Toshio Futami, Makiko Ikeda
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Patent number: RE42993Abstract: A liquid crystal driver includes a voltage generator for generating gray scale voltages on the basis of reference voltages, and an output device for selecting one gray scale voltage from the generated gray scale voltages in accordance with display data, for applying inversion/non-inversion control to the selected gray scale voltage with respect to an inversion reference voltage on the basis of the selected gray scale voltage, an AC switching signal and the inversion reference voltage, and for outputting different liquid crystal supply voltages for one and the same display data to a liquid crystal panel.Type: GrantFiled: August 28, 2009Date of Patent: December 6, 2011Assignee: Hitachi, Ltd.Inventors: Hiroyuki Nitta, Hiroyuki Mano, Tsutomu Furuhashi, Isao Takita, Satoru Tsunekawa, Toshio Futami, Makiko Ikeda