Patents by Inventor Toshio Ueda

Toshio Ueda 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).

  • Patent number: 6891519
    Abstract: A driving method for a display apparatus produces light emission by applying a sustain discharge pulse repeatedly. A pulse width of the sustain discharge pulse is varied within one subfield and is controlled in accordance with the amount of voltage drop of a sustain discharge voltage. A display apparatus has a display panel section, a data converter, a power supply section, and a sustain discharge pulse control circuit. The data converter receives an image signal and supplies image data suitable for the display apparatus to the display panel section, and the power supply section supplies power to the display panel section. Further, the sustain discharge pulse control circuit varies a pulse width of sustain discharge pulse within one subfield and controls the pulse width of the sustain discharge pulse in accordance with the amount of voltage drop of a sustain discharge voltage.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: May 10, 2005
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Takayuki Ooe, Toshio Ueda
  • Publication number: 20040263434
    Abstract: A display driving method drives a display to make a gradation display on a screen of the display depending on a length of a light emission time in each of sub fields forming 1 field, where 1 field is a time in which an image is displayed, N sub fields SF1 through SFN form 1 field, and each sub field includes an address display-time in which a wall charge is formed with respect to all pixels which are to emit light within the sub field and a sustain time which is equal to the light emission time and determines a luminance level. The display driving method includes the steps of setting the sustain times of each of the sub fields approximately constant within 1 field, and displaying image data on the display using N+1 gradation levels from a luminance level 0 to a luminance level N.
    Type: Application
    Filed: May 17, 2004
    Publication date: December 30, 2004
    Applicant: FUJITSU LIMITED
    Inventors: Yukio Otobe, Masahiro Yoshida, Nobuaki Otaka, Masaya Tajima, Katsuhiro Ishida, Kiyotaka Ogawa, Toshio Ueda
  • Publication number: 20040218101
    Abstract: The color reproduction correction circuit which corrects the color distortion caused when color signals using the first combination of the three primary colors are reproduced in a color display of the second combination of the different primary color sources has been disclosed, wherein: a provided color correction circuit generates the mixed color signal by multiplying the color signal in question by the specified coefficients and adding the mixed color signal to other color signals; the mixed colors in the second combination are used as primary color light sources in the second combination; the specified coefficients are determined so that these mixed color light sources are made close to the coordinates of the primary color light sources of the first combination; and the luminescent chromaticity values of the three primary colors are corrected so that the chromaticity values of the device match those specified by the signal system.
    Type: Application
    Filed: June 4, 2004
    Publication date: November 4, 2004
    Applicant: Fujitsu Hitachi Plasma Display Limited
    Inventors: Ken Kumakura, Kazuyoshi Yamada, Hideaki Ohki, Hiroshi Ohtaka, Toshio Ueda
  • Patent number: 6753930
    Abstract: The color reproduction correction circuit which corrects the color distortion caused when color signals using the first combination of the three primary colors are reproduced in a color display of the second combination of the different primary color sources has been disclosed, wherein: a provided color correction circuit generates the mixed color signal by multiplying the color signal in question by the specified coefficients and adding the mixed color signal to other color signals; the mixed colors in the second combination are used as primary color light sources in the second combination; the specified coefficients are determined so that these mixed color light sources are made close to the coordinates of the primary color light sources of the first combination; and the luminescent chromaticity values of the three primary colors are corrected so that the chromaticity values of the device match those specified by the signal system.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: June 22, 2004
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Ken Kumakura, Kazuyoshi Yamada, Hideaki Ohki, Hiroshi Ohtaka, Toshio Ueda
  • Patent number: 6686698
    Abstract: A PDP apparatus in which degradation in image quality such as display missing points does not occur, even if the peak luminance is increased, has been disclosed. In the PDP apparatus, the display load ratio of each subfield is detected and a sustain pulse cycle is changed according to the display load ratio of each subfield. Moreover, an adaptive sustain pulse number change means is provided, which calculates the total amount of variations in time by summing the variations in time in a display field caused by the changes in the sustain pulse cycles and increases/decreases the number of sustain pulses of each subfield according to the total amount of variations in time.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: February 3, 2004
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Masanori Takeuchi, Toshio Ueda, Shigeharu Asao
  • Patent number: 6650307
    Abstract: A method of driving a display panel, and a panel display apparatus, in which displays do not lack realism even when power control is performed, have been disclosed. In the display panel driving method, the display frame for a screen is comprised of plural subframes, each being assigned a number of times discharge for light emission is performed according to the specified luminance relation, the representation with gray scale is performed by combining the subframes that display according to the intensity of the input image signal for each cell, and the power consumption is controlled by both the control of the total number of times discharge for light emission is performed of the display frame and the control of the gain of the input image signal.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: November 18, 2003
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Kosaku Toda, Toshio Ueda, Takayuki Ooe
  • Patent number: 6640677
    Abstract: A machine tool which can avoid interference between a tool post body and a second headstock without increasing the size of a fixed bed or decreasing the structural support rigidity is disclosed. Specifically, a combined-machining lathe comprises a first headstock fixed on a fixed bed; at least one of a tailstock and a second headstock is movably disposed on the fixed bed so as to be movable along the fixed bed; and a tool post body for rotationally supporting a turret having a plurality of tools set thereon. The tool post body is movably disposed between the first headstock and the at least one of a tailstock and a second headstock. The turret is placed on one side of the tool post body that is closer to the at least one of a tailstock and a second headstock, and the first headstock has a recessed portion that is dimensioned to accommodate the tool post body therein.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: November 4, 2003
    Assignee: Mori Seiki Co., Ltd.
    Inventors: Toshio Ueda, Tsutomu Tokuma
  • Patent number: 6626058
    Abstract: A C-axis driving system for machine tools is disclosed that comprises a worm wheel mounted on a spindle that is rotatably supported by a headstock. The C-axis driving system also includes a worm shaft with a worm formed therein directed perpendicular to an axis of the spindle and placed so as to be pivotable about a pivotal shaft between an engagement position, and a disengagement position. The C-axis driving system also includes a C-axis driving motor connected to the worm shaft and serving to rotationally index the spindle to a specified rotational angle. The pivotal shaft is provided on the worm shaft base so as to be directed perpendicular to an axis of the worm shaft. Thus, the C-axis driving system for machine tools is capable of reducing the size of the C-axis unit as well as the cost while allowing a smooth engagement with the worm wheel.
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: September 30, 2003
    Assignee: Mori Seiki Co., Ltd.
    Inventors: Toshio Ueda, Yoshitane Uemura, Nobuaki Sasabe
  • Publication number: 20030179162
    Abstract: A driving method for a display apparatus produces light emission by applying a sustain discharge pulse repeatedly. A pulse width of the sustain discharge pulse is varied within one subfield and is controlled in accordance with the amount of voltage drop of a sustain discharge voltage. A display apparatus has a display panel section, a data converter, a power supply section, and a sustain discharge pulse control circuit. The data converter receives an image signal and supplies image data suitable for the display apparatus to the display panel section, and the power supply section supplies power to the display panel section. Further, the sustain discharge pulse control circuit varies a pulse width of sustain discharge pulse within one subfield and controls the pulse width of the sustain discharge pulse in accordance with the amount of voltage drop of a sustain discharge voltage.
    Type: Application
    Filed: November 6, 2002
    Publication date: September 25, 2003
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Takayuki Ooe, Toshio Ueda
  • Publication number: 20030173903
    Abstract: A PDP apparatus in which degradation in image quality such as display missing points does not occur, even if the peak luminance is increased, has been disclosed. In the PDP apparatus, the display load ratio of each subfield is detected and a sustain pulse cycle is changed according to the display load ratio of each subfield. Moreover, an adaptive sustain pulse number change means is provided, which calculates the total amount of variations in time by summing the variations in time in a display field caused by the changes in the sustain pulse cycles and increases/decreases the number of sustain pulses of each subfield according to the total amount of variations in time.
    Type: Application
    Filed: November 12, 2002
    Publication date: September 18, 2003
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Masanori Takeuchi, Toshio Ueda, Shigeharu Asao
  • Publication number: 20030174150
    Abstract: A method for driving a display apparatus has a predetermined plural number of light emission blocks in each field, and displays grayscale by combining the light emission blocks. A grayscale level addition/subtraction operation is performed, by computation, on a discontinuous grayscale in accordance with an input grayscale level or the grayscale level addition/subtraction operation is performed, on a discontinuous grayscale, in accordance with an input grayscale level, before applying error diffusion, for any brightness discontinuous portion occurring due to the combination of the light emission blocks.
    Type: Application
    Filed: October 22, 2002
    Publication date: September 18, 2003
    Applicant: Fujitsu Hitachi Plasma Display Limited
    Inventors: Takayuki Ohe, Toshio Ueda, Akira Yamamoto
  • Patent number: 6563486
    Abstract: A display driving method drives a display to make a gradation display on a screen of the display depending on a length of a light emission time in each of subfields forming 1 field, where 1 field is a time in which an image is displayed, N sub fields SF1 throuh SFN form 1 field, and each sub field includes an address display-time in which a wall charge is formed with respect to all pixels which are to emit light within the sub field and a sustain time which is equal to the light emission time and determines a luminance level. The display driving method includes the steps of setting the sustain times of each of the sub fields approximately constant within 1 field, and displaying image data on the display using N+1 gradation levels from a luminance level 0 to a luminance level N.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: May 13, 2003
    Assignee: Fujitsu Limited
    Inventors: Yukio Otobe, Masahiro Yoshida, Nobuaki Otaka, Masaya Tajima, Katsuhiro Ishida, Kiyotaka Ogawa, Toshio Ueda
  • Publication number: 20030082450
    Abstract: A cathode active material for alkaline electrochemical cells comprising an Ag—Bi—M-containing oxidation product produced by oxidizing with an oxidizing agent an Ag—Bi—M-containing neutralized precipitate obtained by reacting inorganic acid salts of silver, bismuth and, optionally, M (M representing at least one metal selected from the group comprised of manganese, nickel and cobalt) with an alkali hydroxide in an aqueous medium; or comprising an Ag—Bi—M-containing oxidation product obtained by reacting inorganic acid salts of silver, bismuth and, optionally, M with an alkali hydroxide in an aqueous medium and in the presence of an oxidizer.
    Type: Application
    Filed: May 10, 2002
    Publication date: May 1, 2003
    Inventors: Koji Tanoue, Yoshikazu Omoto, Yoshiyuki Shoji, Masayuki Nishina, Toshio Ueda
  • Patent number: 6531995
    Abstract: An electrode drive circuit performs interlaced scanning, ensuring that the phases of the sustaining pulse in odd-numbered lines and even-numbered lines among L1 to L8 between surface discharge electrodes are the reverse of each other. With this, when either odd-numbered lines or even-numbered lines are displayed, the voltages applied between the electrodes of the undisplayed lines are at 0, eliminating the necessity for partitioning walls on the surface discharge electrodes. In surface discharge electrodes, X electrodes are provided on the two sides of a Y electrode and the area between the Y electrode and the X electrode on one side is assigned a display line at an odd-numbered frame, and the area between the Y electrode and the X electrode on the other side is assigned a display line in an even-numbered frame.
    Type: Grant
    Filed: August 17, 1998
    Date of Patent: March 11, 2003
    Assignee: Fujitsu Limited
    Inventors: Tomoyuki Ishii, Tadatsugu Hirose, Yoshikazu Kanazawa, Toshio Ueda, Tomokatsu Kishi, Shigetoshi Tomio, Fumitaka Asami
  • Patent number: 6529204
    Abstract: A method of displaying a dynamic halftone image on a display panel made of pixels divides each frame of the image into subframes and turns on and off the subframes. The method includes the steps of finding a line of pixels that simultaneously display a specific intensity level in a frame and another specific intensity level in the next frame, counting the number of pixels in the line, selecting corrective pulses, which turn on/off corresponding subframes to enable/disable corresponding intensity levels, according to the counted number and a change in the specific intensity levels between the frames, and adjusting original display signals for the pixels in the line according to the corrective pulses, respectively. The method eliminates halftone disturbance and false color contours from the image even if the moving speed of the image on the display panel is high.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: March 4, 2003
    Assignees: Fujitsu Limited, Shigeo Mikoshiba
    Inventors: Shigeo Mikoshiba, Takahiro Yamaguchi, Kosaku Toda, Tsutae Shinoda, Kyoji Kariya, Toshio Ueda
  • Publication number: 20030030655
    Abstract: A method of driving a display device has a calculating step, a comparing step, and a controlling step. The calculating step calculates a total number of light-emission pulses within a field, based on an average of display load factors in at least two fields, the comparing step compares the calculated number of light-emission pulses with a number of light-emission pulses based on power consumption, and the controlling step controls a smaller display load factor as the total number of light-emission pulses within a field.
    Type: Application
    Filed: March 28, 2002
    Publication date: February 13, 2003
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Takayuki Ooe, Toshio Ueda, Kosaku Toda
  • Patent number: 6496164
    Abstract: A plasma display device has a first representing unit, a second representing unit, a judging unit, and a selector. The first representing unit lights only one of even display lines and odd display lines which represent one frame, and the second representing unit lights only the other one of the even display lines and the odd display lines. The judging unit judges a condition for an image to be displayed, and the selector selects whichever of the first representing unit and the second representing unit is used to display an image, based on the results of judgment made by the judging unit. Consequently, the service lives of phosphors and a protecting film can be extended and sticking in a screen can be prevented.
    Type: Grant
    Filed: May 18, 1999
    Date of Patent: December 17, 2002
    Assignee: Fujitsu Limited
    Inventors: Takeshi Kuwahara, Yoshikazu Kanazawa, Toshio Ueda
  • Patent number: 6496194
    Abstract: A halftone display method utilizes an activation sequence, having a plurality of luminance blocks predefined in each frame or field to display an image and having redundancy, that enables one gray-scale level to be expressed by any one of a plurality of combinations of subframes (luminance blocks). When determining luminance blocks for use to display gray scale of an arbitrary first pixel, the luminance blocks to be used for the first pixel are selected in accordance with a predetermined rule, based on how the luminance blocks are used for a second pixel located in close proximity to the first pixel. In this way, by actively utilizing the redundancy of the activation sequence, the occurrence of moving-image false contours (false color contours) in video can be minimized, and also a motion compensation equalizing pulse method can be effectively applied to further improve the image display quality.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: December 17, 2002
    Assignees: Fujitsu Limited
    Inventors: Shigeo Mikoshiba, Tomokazu Shiga, Yiwen Zhu, Kiyoshi Igarashi, Kosaku Toda, Toshio Ueda, Kyoji Kariya, Takayuki Ooe, Kazuki Sawa
  • Publication number: 20020154073
    Abstract: A display apparatus, that can prevent thermal destruction and burning with a simple structure, has been disclosed. In the apparatus it is judged that there is possibility of a pattern, whose area with high brightness is small, being displayed frequently, when a state in which the total light emission pulse number remains large occurs with high frequency, and if such a state is detected, the total light emission pulse number (sustain frequency) is reduced to prevent the thermal destruction and burning.
    Type: Application
    Filed: August 15, 2001
    Publication date: October 24, 2002
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Ayahito Kojima, Shigeki Kameyama, Hirohito Kuriyama, Yoshikazu Kanazawa, Toshio Ueda
  • Publication number: 20020130826
    Abstract: A display driving method drives a display to make a gradation display on a screen of the display depending on a length of a light emission time in each of subfields forming 1 field, where 1 field is a time in which an image is displayed, N sub fields SF1 throuh SFN form 1 field, and each sub field includes an address display-time in which a wall charge is formed with respect to all pixels which are to emit light within the sub field and a sustain time which is equal to the light emission time and determines a luminance level. The display driving method includes the steps of setting the sustain times of each of the sub fields approximately constant within 1 field, and displaying image data on the display using N+1 gradation levels from a luminance level 0 to a luminance level N.
    Type: Application
    Filed: March 13, 2002
    Publication date: September 19, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Yukio Otobe, Masahiro Yoshida, Nobuaki Otaka, Masaya Tajima, Katsuhiro Ishida, Kiyotaka Ogawa, Toshio Ueda