Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1997-10-08
2001-11-20
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S068000, C345S063000, C315S169100, C315S169200, C315S169300, C315S169400
Reexamination Certificate
active
06320560
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to plasma display, driving apparatus of plasma display panel and driving system thereof for, for example, display apparatus of personal computer or workstation, a flat type wall hanging television receiver and a display apparatus for advertising and information. This invention is preferably applicable to AC type plasma display.
In plasma display, one field is divided into several sub-fields, and each pixel (cell) is given forth light by exciting a phosphor by ultraviolet rays that are generated by a electric discharge carried out in the cell. The cell that emits light is practiced by an address electric discharge between two set of electrodes which are provided perpendicular to each other on a front side glass substrate and a back side glass substrate respectively and are capable of driving independently.
A first prior art relating to a plasma display is disclosed, for example, Japanese Patent Application Laid-Open No. 1994/186927. In the prior art, the condition of the electric charge particles in all cells is equalized for surely prohibiting lighting for some cells which are not intended to emit light, and two sets of light emitting discharges, that is, a full writing electric discharge and a full erasing electric discharge in each sub-field are carried out so as to be able to use low voltage for an address electric discharge. Therefore, the contrast is deteriorated because light emitting occurs on full panel when black is displayed.
A second prior art is disclosed, for example, Japanese Patent Application Laid-Open No. 1995/49663. In the prior art, the plurality of the sub-fields having the same brightness gradations are arranged to construct a sub-field block, and several blocks are provided. In sub-field blocks, a preliminary discharge including a full writing electric discharge and a fine line erasing electric discharge is performed in one sub-field, and a writing electric discharge and a erasing electric discharge to a pixel is carried out one time. Therefore, deterioration of a panel is reduced and contrast of a display is improved. The second prior art discloses one of the solution to improve the contrast, but no prior art is shown to improve the contrast in which plural sub-fields having different brightness gradations for constructing one sub-field block.
About 3 &mgr;sec to 4 &mgr;sec is needed to write one line of plasma panel, and an ordinal television display has 480 lines. A writing period of a screen is 1.44 msec if a writing period of one line is 3 &mgr;sec, so that 1.44 msec×9≈13 msec is needed for one field. The period of one field is 16.7 msec. A sustaining period is 16.7 msec minus a writing period and preliminary discharge period, and this period is not so long enough. Further, if a display has 760 lines per a screen like a high definition display, or if a display has 8 sub-fields for constructing 256 gradations, period for writing is not sufficient.
SUMMARY OF THE INVENTION
It is an object of the present invention to improve contrast.
It is another object of the present invention to improve contrast by reducing a full erasing electric discharge and full writing electric discharge.
It is still another object of the invention to improve contrast by reducing preliminary discharge without changing the number of sub-fields.
According to a feature of the present invention, to achieve the above object, a plasma display and a plasma display driving system include a first electrode group arranged on a permeable substrate and being capable of driving in common, a second electrode group arranged in parallel with the first electrode group on the permeable substrate and being capable of driving independently, a third electrode group arranged perpendicular to the first and second electrode groups on the other substrate and being capable of driving independently, and the plasma panel and the driving system comprising means for performing at least one electric discharge for equalizing electric charge particles in a cell in which another electric charge particle is caused beforehand.
According to another feature of the present invention, to achieve the above object, a plasma display, and a plasma display panel driving system and circuit include a first electrode group driven in common, a second electrode group driven independently, a third electrode group for an address electric discharge, means for erasing and polarizing electric charge particles by a find line erasing pulse after sustaining period and for supplying an equalizing pulse to one of the electrode group of the first and second electrode group to which the last fine line erasing pulse is supplied and for supplying a regulating pulse to the other electrode of the first and the second electrode groups after supply of the equalizing pulse, thereby controlling the electric charge particles without full erasing electric discharge and full writing electric discharge and improving contrast without light emitting discharge in case of displaying of black color.
According to still another feature of the present invention, to achieve the above object, a plasma display and a plasma display panel driving system and circuit include means for constructing a field block from plurality of sub-fields and for performing a full writing electric discharge and a fine line erasing electric discharge in first sub-field of the field block for decreasing number of electric discharge, means for gathering positive electric charge particles in the vicinity of an address electrode by the full writing electric discharge and fine line erasing electric discharge thereby decreasing a voltage of an address pulse, and means for reproducing the condition of electric charge particles the same as the condition after performing full writing electric discharge and fine line erasing electric discharge are performed by utilizing a sustaining electric discharge in a cell in which the address electric discharge occurred, thereby reducing the voltage of a address electric discharge in the next field without the full writing electric discharge and the fine line electric discharge. In a cell having no address electric discharge, the condition of electric charge particles after the full writing electric discharge and fine line erasing electric discharge are performed is maintained during one field, so that it is sufficient to perform one time of the full writing electric discharge and fine line electric discharge.
These and other objects, features and advantages of the present invention will become more apparent form the following description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5446344 (1995-08-01), Kanazawa
patent: 5656893 (1997-08-01), Shino et al.
patent: 5663741 (1997-09-01), Kanazawa
patent: 5745086 (1998-04-01), Weber
patent: 5889501 (1999-03-01), Sasaki et al.
patent: 0 657 861 A1 (1995-06-01), None
patent: 6-186927 (1994-08-01), None
patent: 7-49663 (1995-02-01), None
patent: 8-63123 (1996-03-01), None
patent: 8-160910 (1996-06-01), None
“Plasma Display”, Kyouritu Shuppan Co.
Ishigaki Masaji
Masuda Takeo
Mizuta Takahisa
Sasaki Takashi
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Nguyen Jimmy H.
Shalwala Bipin
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