Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1996-11-06
2001-08-28
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S068000, C313S581000, C313S585000, C313S250000, C313S281000, C313S292000, C315S169100, C315S169400
Reexamination Certificate
active
06281863
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a memory type AC plasma display panel driving system and method used in a display device such as a personal computer or a work-station and a display device such as a flat wall-hanging type television or an advertisement or the like.
The prior art AC plasma display device is operated such that one light emitting display period is comprised of a full writing period, erasing period, a writing (address) period and a discharge sustaining period as disclosed Japanese Patent Application Laid-Open No. Hei 5-188877, for example, and pulses are applied to the X electrodes at the front surface side for the full writing operation and erasing operation.
However, in the prior art system described above, since the full writing is carried out by the electrodes at the front surface side of the display device, a phenomenon occurs that light emission occurs with the full writing even in the case that a black color displaying, i.e. a light emitting display is not performed, and further the black color is not displayed as a black color, but rather is displayed as a gray color and shows a problem that a contrast is decreased.
The present inventors and others, to solve such problems, invented a new plasma display panel as described in the copending application. The panel has a face plate, a back plate and a partition disposed therebetween. The face plate has a common electrode and a plurality of independent electrodes, and the back plate has a common electrode and a plurality of independent electrodes disposed perpendicular to those electrodes in the front panel so as to be able to do full writing in the back plate side. Further, the present inventors have developed a driving system and method for such plasma display panel.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a plasma display panel driving system and method in which contrast is improved.
It is another object of the present invention to provide a plasma display panel driving system and method in which discharging between electrodes at a back plate side is performed during the full writing period.
It is still another object of the present invention to provide a plasma display panel driving system and method in which any discharging during the full writing period is not carried out at the front plate side.
According to the present invention, the plasma display panel driving system includes a common electrode arranged at a back plate side, an independent electrode arranged parallel to and alternatively with the common electrode at the back plate side, a common electrode is arranged at a front or face plate side and extends transversely with respect to the electrodes arranged at the back plate side, an independent electrode is arranged parallel to and alternatively with the common electrode at the face plate side, an inner partition positioned between the electrodes at the back plate side and the electrodes at the face plate side and has an aperture connected between the space at the back plate side and the space at the face plate side, a fluorescent member or layer is arranged in the space at the face plate side, and a driver generator is provided for driving the electrodes through a full writing period, a front surface erasing period, a writing period, and a discharge sustaining period in each sub-field period and for supplying a first full writing pulse to the common electrode at the back plate side and for supplying a second full writing pulse whose polarity is opposite to the first full writing pulse to the independent electrode at the back plate side for enabling a discharge between the electrodes in the full writing period.
In accordance with the present invention, each of the light emitting display periods is divided into a full writing period, a front surface erasing period, a writing period and a discharge sustaining period, wherein full writing electrical discharging in the full writing period is carried out by the independent electrode and the common electrode arranged at the back plate side in the rear surface space having no fluorescent members, so that the light reaching the front surface side is merely a part of the electrical discharged light. Due to this fact, a volume of light reaching the front surface side is reduced and non-required light is reduced, so that contrast is improved.
The plasma display panel driving system further comprises a protecting pulse generator for supplying a protecting pulse to the independent electrode at the front or face plate side during the full writing period. The protecting pulse protects a discharging carried out between the electrode and the electrode at the back side plate.
According to a feature of the invention, a full writing pulse generator and a protecting pulse generator, etc. are used for driving the driving system.
These and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5371437 (1994-12-01), Amano
patent: 5674553 (1997-10-01), Shinoda et al.
patent: 5744909 (1998-04-01), Amano
patent: 5889501 (1999-03-01), Sasaki et al.
Ishigaki Masaji
Matsuzaki Eiji
Ohtaka Hiroshi
Sano Yuji
Sasaki Takashi
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Lems David L.
Shalwala Bipin
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