Patents by Inventor Kosaku Toda

Kosaku Toda 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: 7423611
    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: Grant
    Filed: March 28, 2002
    Date of Patent: September 9, 2008
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Takayuki Ooe, Toshio Ueda, Kosaku Toda
  • Publication number: 20060273988
    Abstract: The method of driving a display apparatus, in which the gradation scale is represented, by the subfield method, with less flicker even when driven at a frequency of 50 Hz has been disclosed. In this method, the two most weighted subfields (subfields of Bn brightness and Bn?1 brightness when it is assumed that the frame is composed of n subfields and the brightness of n subfields is Bi (i =1?n; B1?B2 . . . Bn?1?Bn)) are arranged at the interval of about half the length of the frame. Because of this, there exist two peaks of the light emission intensity in a frame, the interval being about half the length of the frame, and if the display apparatus is driven at a frequency of 50 Hz and the length of the frame is 20 ms, the variation period of the light emission intensity is 10 ms and the light emission intensity varies at 100 Hz, therefore, flicker is not detected.
    Type: Application
    Filed: August 16, 2006
    Publication date: December 7, 2006
    Applicant: Fujitsu Hitachi Plasma Display Limited
    Inventors: Akira Yamamoto, Hirohito Kuriyama, Ayahito Kojima, Kosaku Toda
  • Patent number: 7126617
    Abstract: The method of driving a display apparatus, in which the gradation scale is represented, by the subfield method, with less flicker even when driven at a frequency of 50 Hz has been disclosed. In this method, the two most weighted subfields (subfields of Bn brightness and Bn?1 brightness when it is assumed that the frame is composed of n subfields and the brightness of n subfields is Bi (i=1?n; B1?B2 . . . Bn?1?Bn)) are arranged at the interval of about half the length of the frame. Because of this, there exist two peaks of the light emission intensity in a frame, the interval being about half the length of the frame, and if the display apparatus is driven at a frequency of 50 Hz and the length of the frame is 20 ms, the variation period of the light emission intensity is 10 ms and the light emission intensity varies at 100 Hz, therefore, flicker is not detected.
    Type: Grant
    Filed: November 6, 2001
    Date of Patent: October 24, 2006
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Akira Yamamoto, Hirohito Kuriyama, Ayahito Kojima, Kosaku Toda
  • Patent number: 6903710
    Abstract: A method of driving a display device assumes a specific pixel on a retina that is formed on the retina based on an input image, and controls light emission of each subframe such that luminance of a specific pixel on the retina becomes substantially equal to luminance of a pixel corresponding to the input image. The display device is driven by constructing one frame with a plurality of subframes, for displaying the input image that moves on a display panel.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: June 7, 2005
    Assignees: Fujitsu Hitachi Plasma Display Limited
    Inventors: Takayuki Ooe, Toshio Ueda, Kosaku Toda, Kyoji Kariya, Shigeo Mikoshiba, Tomokazu Shiga, Makiko Yamada
  • Patent number: 6667728
    Abstract: A plasma display panel has a plurality of first electrodes, a plurality of second electrodes adjacently disposed alternately with the first electrodes, first display lines formed between the first electrodes and the second electrodes adjacent to one side of the first electrodes, second display lines formed between the first electrodes and the second electrodes adjacent to the other side of the first electrodes, and a control circuit for alternately lighting the first and second display lines or lighting only one of the first and second display lines, and for displaying an image on the plasma display panel by dividing a frame or a field into a plurality of sub-fields for a gradation display.
    Type: Grant
    Filed: February 16, 2001
    Date of Patent: December 23, 2003
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Yoshikazu Kanazawa, Kosaku Toda, 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: 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: 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: 20020097201
    Abstract: The method of driving a display apparatus, in which the gradation scale is represented, by the subfield method, with less flicker even when driven at a frequency of 50 Hz has been disclosed. In this method, the two most weighted subfields (subfields of Bn brightness and Bn−1 brightness when it is assumed that the frame is composed of n subfields and the brightness of n subfields is Bi (i=1−n; B1≦B2 . . . Bn−1≦Bn)) are arranged at the interval of about half the length of the frame. Because of this, there exist two peaks of the light emission intensity in a frame, the interval being about half the length of the frame, and if the display apparatus is driven at a frequency of 50 Hz and the length of the frame is 20 ms, the variation period of the light emission intensity is 10 ms and the light emission intensity varies at 100 Hz, therefore, flicker is not detected.
    Type: Application
    Filed: November 6, 2001
    Publication date: July 25, 2002
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Akira Yamamoto, Hirohito Kuriyama, Ayahito Kojima, Kosaku Toda
  • Publication number: 20020063729
    Abstract: A method of driving a display device assumes a specific pixel on a retina that is formed on the retina based on an input image, and controls light emission of each subframe such that luminance of a specific pixel on the retina becomes substantially equal to luminance of a pixel corresponding to the input image. The display device is driven by constructing one frame with a plurality of subframes, for displaying the input image that moves on a display panel.
    Type: Application
    Filed: August 16, 2001
    Publication date: May 30, 2002
    Inventors: Takayuki Ooe, Toshio Ueda, Kosaku Toda, Kyoji Kariya, Shigeo Mikoshiba, Tomokazu Shiga, Makiko Yamada
  • Publication number: 20010054992
    Abstract: A plasma display panel has a plurality of first electrodes, a plurality of second electrodes adjacently disposed alternately with the first electrodes, first display lines formed between the first electrodes and the second electrodes adjacent to one side of the first electrodes, second display lines formed between the first electrodes and the second electrodes adjacent to the other side of the first electrodes, and a control circuit for alternately lighting the first and second display lines or lighting only one of the first and second display lines, and for displaying an image on the plasma display panel by dividing a frame or a field into a plurality of sub-fields for a gradation display.
    Type: Application
    Filed: February 16, 2001
    Publication date: December 27, 2001
    Inventors: Yoshikazu Kanazawa, Kosaku Toda, Shigeharu Asao