Patents by Inventor Eishi Mizobata

Eishi Mizobata 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: 8026653
    Abstract: A display device provided with a screen, comprising: an optical filter having a blind sheet that comprises a plurality of semitranslucent layers having translucence arranged side-by-side extending in a horizontal direction and having a predetermined thickness in a vertical direction, and a plurality of transparent layers which are disposed between the semitranslucent layers and which are of a higher translucency than that of the semitranslucent layers and of a greater thickness than the thickness of the semitranslucent layers; and an adhesive member for sticking the optical filter to the screen, wherein the ratio of the transmittance of a limit angle of the screen with respect to the transmittance of the optical filter at the center of the screen is at least 0.10 and not more than 0.50.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: September 27, 2011
    Assignee: Panasonic Corporation
    Inventors: Toshiharu Oishi, Minoru Higuchi, Takahide Fujimoto, Akihiko Horita, Ryusuke Fukushima, Eishi Mizobata
  • Patent number: 7453423
    Abstract: A plasma display improved in variation of display brightness between unit cells. A control circuit sets, for every pulse, a charge-recovering time period for recovering a charge on a capacitance component of the plasma display panel and a clamp timing period for applying a predetermined sustain voltage to the sustain electrodes or the scan electrodes after the charge-recovering time period through clamp start timing, and sets a sustain-discharge emission intensity ratio, as a ratio of a maximal discharge intensity in the clamp timing period with reference to a discharge intensity in the clamp start timing to a maximum discharge intensity in the charge-recovering time period, at a value that a discharge in the clamp timing period is to spread up to an end of the unit cell. For example, the control circuit sets a sustain-discharge emission intensity ratio substantially at 0.5 or greater or 0.1 or smaller, thus eliminating the occurrence of image retention.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: November 18, 2008
    Assignee: Pioneer Corporation
    Inventor: Eishi Mizobata
  • Patent number: 7408532
    Abstract: Scan electrodes are provided separately in addition to sustain electrode pairs generating a sustain discharge. An Address-While-Display drive, in which a scan pulse and a sustain pulse are applied at the same timing, is conducted for each subfield. When scan pulses are applied to the scan electrodes, a wall voltage is generated by a wall charge formed on the dielectric layer located on the scan electrodes. This wall voltage is set higher in the negative voltage direction than the wall voltage generated by a wall charge formed on the dielectric layer located on the sustain electrode pairs. As a result, the display luminance level is increased, increase in the scale of power source circuit can be avoided, and a wide drive margin can be obtained.
    Type: Grant
    Filed: June 8, 2005
    Date of Patent: August 5, 2008
    Assignee: Pioneer Corporation
    Inventor: Eishi Mizobata
  • Patent number: 7358931
    Abstract: A plasma display device is provided which is capable of expanding an ensured operating temperature range or operating life time even at time of changes of a driving margin induced by a panel temperature or cumulative operating time of the panel. Display is controlled in a scanning period during which writing discharge is made to occur in a cell, in a sustaining period during which a cell having undergone writing discharge is turned ON for displaying, and in an initializing period during which wall charges in a cell and space charges accumulated before the scanning period starts are initialized. A wall charge adjusting period during which a potential difference between scanning electrodes and data electrodes varies gradually is set and a change rate of a potential between scanning electrodes and data electrodes during the wall charge adjusting period is changed according to the panel temperature and/or cumulative operating time of the panel.
    Type: Grant
    Filed: August 27, 2004
    Date of Patent: April 15, 2008
    Assignee: Pioneer Corporation
    Inventors: Eishi Mizobata, Tadashi Nakamura
  • Patent number: 7145525
    Abstract: In a three-electrode AC plasma display panel, a plurality of X electrodes (22) and a plurality of Y electrodes (23) are alternately arranged parallel to each other on one of two, front and rear insulating substrates (20, 21) opposing each other, and a plurality of data electrodes (29) are arranged on the other insulating substrate to cross the X and Y electrodes (22, 23) at right angles. In this panel, cell separation partition walls (33) are arranged on the front insulating substrate, on which the X and Y electrodes (22, 23) are arranged, along the X and Y electrodes (22, 23). In a driving method for the three-electrode AC plasma display panel, progressive display is performed depending on whether discharge simultaneously occurs between all the adjacent pairs of X and Y electrodes (22, 23).
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: December 5, 2006
    Assignee: Pioneer Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20060066518
    Abstract: A plasma display improved in variation of display brightness between unit cells. A control circuit sets, for every pulse, a charge-recovering time period for recovering a charge on a capacitance component of the plasma display panel and a clamp timing period for applying a predetermined sustain voltage to the sustain electrodes or the scan electrodes after the charge-recovering time period through clamp start timing, and sets a sustain-discharge emission intensity ratio, as a ratio of a maximal discharge intensity in the clamp timing period with reference to a discharge intensity in the clamp start timing to a maximum discharge intensity in the charge-recovering time period, at a value that a discharge in the clamp timing period is to spread up to an end of the unit cell. For example, the control circuit sets a sustain-discharge emission intensity ratio substantially at 0.5 or greater or 0.1 or smaller, thus eliminating the occurrence of image retention.
    Type: Application
    Filed: September 20, 2005
    Publication date: March 30, 2006
    Inventor: Eishi Mizobata
  • Patent number: 7012580
    Abstract: A method for driving a plasma display device is provided which is capable of causing writing discharge to normally occur. A sub-field includes an initializing period, a scanning period during which video data to display a video is written in a discharge cell by causing writing discharge to occur between a scanning electrode and a data electrode, and a sustaining period during which sustaining discharge to cause the discharge cell in which a writing discharge has occurred to emit light in a manner to correspond to video data is made to occur between the scanning electrode and a sustaining electrode. The initializing period includes a wall charge adjusting period during which wall charge adjusting discharge to adjust charges accumulated between the scanning electrode and the sustaining electrode is made to occur, a sustaining erasing period, a priming period, and a priming erasing period.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: March 14, 2006
    Assignee: Pioneer Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20060028406
    Abstract: In a three-electrode AC plasma display panel, a plurality of X electrodes (22) and a plurality of Y electrodes (23) are alternately arranged parallel to each other on one of two, front and rear insulating substrates (20, 21) opposing each other, and a plurality of data electrodes (29) are arranged on the other insulating substrate to cross the X and Y electrodes (22, 23) at right angles. In this panel, cell separation partition walls (33) are arranged on the front insulating substrate, on which the X and Y electrodes (22, 23) are arranged, along the X and Y electrodes (22, 23). In a driving method for the three-electrode AC plasma display panel, progressive display is performed depending on whether discharge simultaneously occurs between all the adjacent pairs of X and Y electrodes (22, 23).
    Type: Application
    Filed: October 13, 2005
    Publication date: February 9, 2006
    Inventor: Eishi Mizobata
  • Patent number: 6995735
    Abstract: A method for driving an AC plasma display panel which makes it possible to reduce flicker in display and have stable and high luminance. In a first step, a wall charge of same amount is produced both in an X electrode 22 and a Y electrode 23 by writing discharge during a scanning period. At this time, the amount of the wall charge is adjusted depending on gray scale to be displayed. In a second step, during a sustaining period, a timing of a start of the sustaining discharge is changed by changing a sustaining start control voltage as a voltage of a data electrode. Gradation sequence are displayed through the above steps.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: February 7, 2006
    Assignee: NEC Corporation
    Inventor: Eishi Mizobata
  • Patent number: 6989802
    Abstract: In a priming erasing period, a voltage Vpe1 is applied to a common electrode, and after an electric potential of a scanning electrode is discontinuously lowered to a positive electric potential lower than the voltage Vpe1, the electric potential is continuously lowered to a voltage Vpe2. In this case, an electric potential difference between the voltage Vpe1 and the voltage Vpe2 is set equal to a firing voltage. Also, an electric potential of the scanning electrode at an end of the priming erasing period is set higher than an electric potential of a data electrode by approximately 20 V. With this operation, there is provide an AC-type plasma display panel having an extended driving margin (range) of a sustaining voltage and capable of being driven by a low voltage.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: January 24, 2006
    Assignee: Pioneer Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20050280610
    Abstract: Scan electrodes are provided separately in addition to sustain electrode pairs generating a sustain discharge. An Address-While-Display drive, in which a scan pulse and a sustain pulse are applied at the same timing, is conducted for each subfield. When scan pulses are applied to the scan electrodes, a wall voltage is generated by a wall charge formed on the dielectric layer located on the scan electrodes. This wall voltage is set higher in the negative voltage direction than the wall voltage generated by a wall charge formed on the dielectric layer located on the sustain electrode pairs. As a result, the display luminance level is increased, increase in the scale of power source circuit can be avoided, and a wide drive margin can be obtained.
    Type: Application
    Filed: June 8, 2005
    Publication date: December 22, 2005
    Inventor: Eishi Mizobata
  • Patent number: 6977632
    Abstract: By a method of the present invention, each field is made up of at least one sub-field, a sub-field of which is made up of a preliminary discharge period, a scanning period, and a sustaining period, the preliminary discharge period of which is made up of a sustaining erasing period, a priming period, and a priming erasing period, the sustaining erasing period of which is made up of a fist sustaining erasing period and a second sustaining erasing period. Negative wall charges are formed over both a scanning electrode and a common electrode in a display cell where sustaining discharge has occurred in an immediately preceding sub-field in the first sustaining erasing period and then are adjusted so that they may have almost the same amount in the second sustaining erasing period.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: December 20, 2005
    Assignee: NEC Plasma Display Corporation
    Inventor: Eishi Mizobata
  • Patent number: 6954187
    Abstract: A method for driving an address-display separated-type AC (Alternating Current) PDP (Plasma Display Panel) is provided which is capable of having sequentially and continuously wall charges be formed sufficiently on a scanning electrode and sustaining electrode even when a width of a scanning pulse is shortened. Driving operations of a scanning driver and sustaining driver for the scanning electrode and the sustaining electrode during a pre-discharge period are the same as those employed in the conventional method. Driving operations for the scanning electrode during a scanning period are also the same as those in the conventional method except following. At ending time of a period during which a scanning pulse is applied to the scanning electrode, a potential difference obtained by superimposing a writing wall charge forming pulse on a sustaining pulse is applied for 3 ?sec to 5 ?sec.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: October 11, 2005
    Assignee: NEC Plasma Display Corporation
    Inventors: Eishi Mizobata, Tadashi Nakamura, Yoshito Tanaka, Manabu Fujiwara
  • Patent number: 6882327
    Abstract: The number of X electrodes of a PDP to be driven is m, the number of Y electrodes of the same is m+1, and they are alternately disposed at equal intervals. The intersections (2m?1) between all the X electrodes and Y electrodes and the data electrodes (n) form each cell, and a total of (2m?1)√ón pixels exist. Wall charges with the same polarity and the same amount are formed on the X electrode and Y electrode within one cell while surface discharge occurs between the X electrode and Y electrode, and lighting and non-lighting is distinguished based on the wall charge amount. The surface discharge is set so as not to occur when either the X electrodes or Y electrodes only change their voltages.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: April 19, 2005
    Assignee: Pioneer Plasma Display Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20050068262
    Abstract: A plasma display device is provided which is capable of expanding an ensured operating temperature range or operating life time even at time of changes of a driving margin induced by a panel temperature or cumulative operating time of the panel. Display is controlled in a scanning period during which writing discharge is made to occur in a cell, in a sustaining period during which a cell having undergone writing discharge is turned ON for displaying, and in an initializing period during which wall charges in a cell and space charges accumulated before the scanning period starts are initialized. A wall charge adjusting period during which a potential difference between scanning electrodes and data electrodes varies gradually is set and a change rate of a potential between scanning electrodes and data electrodes during the wall charge adjusting period is changed according to the panel temperature and/or cumulative operating time of the panel.
    Type: Application
    Filed: August 27, 2004
    Publication date: March 31, 2005
    Inventors: Eishi Mizobata, Tadashi Nakamura
  • Publication number: 20050052361
    Abstract: A method for driving an address-display separated-type AC (Alternating Current) PDP (Plasma Display Panel) is provided which is capable of having sequentially and continuously wall charges be formed sufficiently on a scanning electrode and sustaining electrode even when a width of a scanning pulse is shortened. Driving operations of a scanning driver and sustaining driver for the scanning electrode and the sustaining electrode during a pre-discharge period are the same as those employed in the conventional method. Driving operations for the scanning electrode during a scanning period are also the same as those in the conventional method except following. At ending time of a period during which a scanning pulse is applied to the scanning electrode, a potential difference obtained by superimposing a writing wall charge forming pulse on a sustaining pulse is applied for 3 sec to 5 sec.
    Type: Application
    Filed: September 10, 2004
    Publication date: March 10, 2005
    Inventors: Eishi Mizobata, Tadashi Nakamura, Yoshito Tanaka, Manabu Fujiwara
  • Publication number: 20040130508
    Abstract: A method for driving a plasma display device is provided which is capable of causing writing discharge to normally occur. A sub-field includes an initializing period, a scanning period during which video data to display a video is written in a discharge cell by causing writing discharge to occur between a scanning electrode and a data electrode, and a sustaining period during which sustaining discharge to cause the discharge cell in which a writing discharge has occurred to emit light in a manner to correspond to video data is made to occur between the scanning electrode and a sustaining electrode. The initializing period includes a wall charge adjusting period during which wall charge adjusting discharge to adjust charges accumulated between the scanning electrode and the sustaining electrode is made to occur, a sustaining erasing period, a priming period, and a priming erasing period.
    Type: Application
    Filed: December 18, 2003
    Publication date: July 8, 2004
    Applicant: NEC PLASMA DISPLAY CORPORATION
    Inventor: Eishi Mizobata
  • Patent number: 6734844
    Abstract: A method of driving an ac-discharge type PDP is provided, which ensures a satisfactorily long sustain period and prevents the luminance of the display screen from lowering even if the count of the scan lines is increased. The PDP has row electrodes and column electrodes that form pixels arranged in a matrix array, and a dielectric layer formed to cover the pixels. In the step (a), scan pulses are applied successively to the row electrodes while data pulses are applied to the column electrodes according to a display signal in a scan period, thereby generating wall discharge in the dielectric layer due to writing discharge. The amount of the wall charge in each of the pixels varies according to the display signal. In the step (b), conversion discharge is caused in a conversion period after the scan period, thereby decreasing the amount of the wall charge in the pixels. The conversion discharge is caused in a different state in each of the pixels according to the amount of the wall charge.
    Type: Grant
    Filed: June 3, 2003
    Date of Patent: May 11, 2004
    Assignee: NEC Corporation
    Inventor: Eishi Mizobata
  • Patent number: 6731275
    Abstract: A method of driving an ac-discharge type PDP is provided, which ensures a satisfactorily long sustain period and prevents the luminance of the display screen from lowering even if the count of the scan lines is increased. The PDP has row electrodes and column electrodes that form pixels arranged in a matrix array, and a dielectric layer formed to cover the pixels. In the step (a), scan pulses are applied successively to the row electrodes while data pulses are applied to the column electrodes according to a display signal in a scan period, thereby generating wall discharge in the dielectric layer due to writing discharge. The amount of the wall charge in each of the pixels varies according to the display signal. In the step (b), conversion discharge is caused in a conversion period after the scan period, thereby decreasing the amount of the wall charge in the pixels. The conversion discharge is caused in a different state in each of the pixels according to the amount of the wall charge.
    Type: Grant
    Filed: June 3, 2003
    Date of Patent: May 4, 2004
    Assignee: NEC Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20040051683
    Abstract: A method for driving an AC plasma display panel which makes it possible to reduce flicker in display and have stable and high luminance. In a first step, a wall charge of same amount is produced both in an X electrode 22 and a Y electrode 23 by writing discharge during a scanning period. At this time, the amount of the wall charge is adjusted depending on gray scale to be displayed. In a second step, during a sustaining period, a timing of a start of the sustaining discharge is changed by changing a sustaining start control voltage as a voltage of a data electrode. Gradation sequence are displayed through the above steps.
    Type: Application
    Filed: June 20, 2003
    Publication date: March 18, 2004
    Inventor: Eishi Mizobata