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).

  • Publication number: 20030193453
    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: Application
    Filed: June 3, 2003
    Publication date: October 16, 2003
    Inventor: Eishi Mizobata
  • Publication number: 20030193452
    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: Application
    Filed: June 3, 2003
    Publication date: October 16, 2003
    Inventor: Eishi Mizobata
  • Publication number: 20030189532
    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: November 25, 2002
    Publication date: October 9, 2003
    Inventor: Eishi Mizobata
  • Patent number: 6573878
    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: January 11, 2000
    Date of Patent: June 3, 2003
    Assignee: NEC Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20030095083
    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: Application
    Filed: November 21, 2002
    Publication date: May 22, 2003
    Applicant: NEC PLASMA DISPLAY CORPORATION
    Inventor: Eishi Mizobata
  • Publication number: 20030095084
    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: Application
    Filed: November 21, 2002
    Publication date: May 22, 2003
    Applicant: NEC PLASMA DISPLAY CORPORATION
    Inventor: Eishi Mizobata
  • Patent number: 6504584
    Abstract: In a tablet integrated type liquid crystal display apparatus, a first transparent substrate is provided on a view side. The first substrate is a plastic substrate having a thickness equal to or thinner than 0.6 mm, and a counter electrode is formed on the first substrate. A second substrate on which a driving layer composed of switching elements and pixel electrodes respectively connected to the switching elements is formed. The second substrate is a glass substrate having a thickness in a range of 0.6 mm to 1.1 mm. A guest host liquid crystal layer sandwiched by the first substrate and the second substrate such that the guest host liquid crystal is driven by a voltage applied between the counter electrode and the pixel electrode. A tablet electrode layer may be provided between the first substrate and the counter electrode.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: January 7, 2003
    Assignee: NEC Corporation
    Inventors: Naoyasu Ikeda, Eishi Mizobata, Yoshihiko Hirai
  • Patent number: 6473140
    Abstract: In an LCD, there is used a GH-mode liquid crystal of which change in transmittivity due to variation in gap thickness is less than that of the conventional TN liquid crystal. A tablet facility is directly arranged or electrodes having the function of the tablet are formed over or below the liquid crystal. Thanks to the structure, this protection plate conventionally required to prevent the change in gap thickness resulting due to pressure of a pen input device applied to the LCD can be eliminated. Consequently, it is possible to reduce weight, volume, and parallax of the LCD. An active matrix LCD with integrated table-type input device is attainable in a simple configuration without increasing weight and volume thereof.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: October 29, 2002
    Assignee: NEC Corporation
    Inventors: Eishi Mizobata, Naoyasu Ikeda, Yoshihiko Hirai
  • Patent number: 6407503
    Abstract: A three-electrode AC type plasma display panel has an array of display cells each including therein pair of scanning electrode and common electrode extending in perpendicular to a data electrode. The capacitance of the insulating film disposed between the scanning electrode and the data electrode is higher than the capacitance of the insulating film disposed between the common electrode and the data electrode, whereby stable discharge can be obtained between the scanning electrode and the data electrode while suppressing discharge between the common electrode and the data electrode. The difference in the capacitance is obtained by a configuration of a dielectric film, fluorescent film or the data electrode.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: June 18, 2002
    Assignee: NEC Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20020070908
    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)×n 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: Application
    Filed: December 21, 2001
    Publication date: June 13, 2002
    Inventor: Eishi Mizobata
  • Patent number: 6400094
    Abstract: A method for driving a plasma display panel is provided which is capable of making stable a discharge occurring when sustaining discharge starts and, when same gray shades are displayed, the discharge can be started with exactly same timing to perform the display of same gray shades. In the method, voltages of a scanning electrode and a common electrode during a sustaining period are set so that the discharge occurring with timing when the sustaining discharge starts is an opposite discharge which occurs between the scanning electrode and a data electrode and the timing when the sustaining discharge starts is decided based on a potential difference between electrodes placed opposite to each other.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: June 4, 2002
    Assignee: NEC Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20020063526
    Abstract: A three-electrode AC type plasma display panel has a an array of display cells each including therein pair of scanning electrode and common electrode extending in perpendicular to a data electrode. The capacitance of the insulating film disposed between the scanning electrode and the data electrode is higher than the capacitance of the insulating film disposed between the common electrode and the data electrode, whereby stable discharge can be obtained between the scanning electrode and the data electrode while suppressing discharge between the common electrode and the data electrode. The difference in the capacitance is obtained by a configuration of a dielectric film, fluorescent film or the data electrode.
    Type: Application
    Filed: September 13, 1999
    Publication date: May 30, 2002
    Inventor: EISHI MIZOBATA
  • Patent number: 6333600
    Abstract: According to this invention, there is provided a plasma display panel without reduction of luminance and with good contrast. The plasma display panel with high luminance and good contrast is provided by forming a photoreflection or photoabsorption layer for minimizing reflection of external light on the rear side of a fluorescence layer to directly radiate light emitted to the viewing side from the fluorescence layer as display light, and by reducing a reflectance on the fluorescence layer to below 25% in terms of reflection of external light which may cause contrast reduction.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: December 25, 2001
    Assignee: NEC Corporation
    Inventor: Eishi Mizobata
  • Publication number: 20010030512
    Abstract: A method for driving a plasma display panel is provided which is capable of making stable a discharge occurring when sustaining discharge starts and, when same gray shades are displayed, the discharge can be started with exactly same timing to perform the display of same gray shades.
    Type: Application
    Filed: April 12, 2001
    Publication date: October 18, 2001
    Applicant: NEC CORPORATION
    Inventor: Eishi Mizobata
  • Patent number: 6295101
    Abstract: In a tablet integrated type liquid crystal display apparatus, a first transparent substrate is provided on a view side. The first substrate is a plastic substrate having a thickness equal to or thinner than 0.6 mm, and a counter electrode is formed on the first substrate. A second substrate on which a driving layer composed of switching elements and pixel electrodes respectively connected to the switching elements is formed. The second substrate is a glass substrate having a thickness in a range of 0.6 mm to 1.1 mm. A guest host liquid crystal layer sandwiched by the first substrate and the second substrate such that the guest host liquid crystal is driven by a voltage applied between the counter electrode and the pixel electrode. A tablet electrode layer may be provided between the first substrate and the counter electrode. Alternatively, a tablet electrode layer may be provided on the first substrate on an opposite side of the counter electrode.
    Type: Grant
    Filed: September 9, 1999
    Date of Patent: September 25, 2001
    Assignee: NEC Corporation
    Inventors: Naoyasu Ikeda, Eishi Mizobata, Yoshihiko Hirai
  • Publication number: 20010020986
    Abstract: In a tablet integrated type liquid crystal display apparatus, a first transparent substrate is provided on a view side. The first substrate is a plastic substrate having a thickness equal to or thinner than 0.6 mm, and a counter electrode is formed on the first substrate. A second substrate on which a driving layer composed of switching elements and pixel electrodes respectively connected to the switching elements is formed. The second substrate is a glass substrate having a thickness in a range of 0.6 mm to 1.1 mm. A guest host liquid crystal layer sandwiched by the first substrate and the second substrate such that the guest host liquid crystal is driven by a voltage applied between the counter electrode and the pixel electrode. A tablet electrode layer may be provided between the first substrate and the counter electrode. Alternatively, a tablet electrode layer may be provided on the first substrate on an opposite side of the counter electrode.
    Type: Application
    Filed: May 2, 2001
    Publication date: September 13, 2001
    Inventors: Naoyasu Ikeda, Eishi Mizobata, Yoshihiko Hirai
  • Patent number: 6266112
    Abstract: In a reflective liquid crystal display comprising a first insulative plate having a reflector, a second insulative plate having a transparent electrode, and a liquid crystal layer sandwiched between the reflector and the transparent electrode, a convex-concave surface is provided at the side of the second insulative plate. With this arrangement, a desired light scattering characteristics is realized with a high image quality and a high brightness, with neither a fuzziness of displayed characters nor a double image. On the other hand, since no thin film transistor is formed at the side of the second insulative plate, the convex-concave surface can be simply formed with no necessity of depositing an insulative film covering the thin film transistor and patterning the deposit insulating film.
    Type: Grant
    Filed: January 7, 2000
    Date of Patent: July 24, 2001
    Assignee: NEC Corporation
    Inventors: Eishi Mizobata, Hidenori Ikeno, Hiroshi Kanoh
  • Patent number: 6208395
    Abstract: The present invention relates to a light reflection plate provided on a substrate included in a reflective liquid crystal display device. The light reflection plate comprises the following elements. Convex patterns are shaped in random and formed on the substrate. The convex patterns have side walls defining apertures, bottoms of which are defined by the substrate. At least a light reflective film is made of a conductive material and continuously extending over the convex patterns and within the apertures to have the light reflective film possess a rough surface comprising convex and concave portions which have random sizes in relation to the convex patterns.
    Type: Grant
    Filed: August 16, 1996
    Date of Patent: March 27, 2001
    Assignee: NEC Corporation
    Inventors: Hiroshi Kanoh, Eishi Mizobata, Setsuo Kaneko
  • Patent number: 6181396
    Abstract: A reflective liquid crystal display apparatus reflective plate includes embodiments with a full-width at half maximum value in a distribution graph of distances between adjacent projecting or recessed portions with an average of the distances between the adjacent projecting or recessed portions within 0.3 to 0.9; an average of distances between adjacent projecting or recessed portions within 1 &mgr;m to 80 &mgr;m; a full-width at half maximum value in a distribution graph of heights of projecting or recessed portions with an average of the heights falling within 0.2 to 0.9; a maximum height of corrugations on a surface of the reflective plate within 0.1 &mgr;m to 5 &mgr;m; and a region having a horizontal inclination angle of 0° occupying 20% or less of an entire region inside the surface of the pixel electrode and also with an average inclination angle of corrugations in the entire region is 50 to 10° in all azimuths on the pixel electrode as the reflective plate.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: January 30, 2001
    Assignee: NEC Corporation
    Inventors: Hiroshi Kanoh, Eishi Mizobata
  • Patent number: 6069675
    Abstract: In an LCD, there is used a GH-mode liquid crystal of which change in transmittivity due to variation in gap thickness is less than that of the conventional TN liquid crystal. A tablet facility is directly arranged or electrodes having the function of the tablet are formed over or below the liquid crystal. Thanks to the structure, this protection plate conventionally required to prevent the change in gap thickness resulting due to pressure of a pen input device applied to the LCD can be eliminated. Consequently, it is possible to reduce weight, volume, and parallax of the LCD. An active matrix LCD with integrated table-type input device is attainable in a simple configuration without increasing weight and volume thereof.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: May 30, 2000
    Assignee: NEC Corporation
    Inventors: Eishi Mizobata, Naoyasu Ikeda, Yoshihiko Hirai