Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-06-18
2001-06-26
Powell, Mark R. (Department: 2779)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S060000, C313S584000
Reexamination Certificate
active
06252574
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a driving apparatus for a plasma display panel.
2. Description of the Related Art
A plasma display panel (designated as “PDP” hereinafter) is known as an image display that provides a reduction in its thickness and an increase in its screen size. The PDP has a number of effective features not found in conventional CRT displays. There is a need for a reduction in manufacturing cost and an improved quality of the plasma display panel.
Generally, a PDP comprises a plurality of row electrodes arranged in parallel and a plurality of column electrodes extending perpendicularly to the row electrodes. A display cell is provided at each point of the row and column electrodes. Particularly, in a color type of PDP, an additional row electrode is arranged near the row electrode to be paired so as to prevent fluorescent layer in the cell from wearing due to ion impact. Surface discharge between the pair of row electrodes is utilized as a light source for the color type of PDP.
The PDP described above requires a plurality of electrodes and a driving circuit for controlling the display for every cell. For providing a PDP having a larger screen size, an immense amount of discharge current is required. Particularly, the integration of the plurality of driving circuits into one chip requires an IC having a large capacity of power supply. Thus, this is not practical in terms of heat generation and manufacturing cost. To overcome the above problem, a conventional PDP driving apparatus divides the group of pairs of row electrodes into a plurality of sub-blocks in order to reduce a load on one IC. Each of sub-blocks then includes one pulse generator. In addition, a driving apparatus is provided for selectively relaying output pulses from the pulse generator.
However, if there is some difference between impedance and output level of pulses of the pulse generators, the levels of pulses supplied from the driving circuits to the pair of row electrodes may differ from one sub-block to another. In such a case, a problem arises in that a luminance distribution is not uniform on the display surface of the PDP.
OBJECT OF THE INVENTION
A main object of the present invention is to provide a driving apparatus for a plasma display panel wherein a pulse generator in every sub-block supplies a uniform output level to the corresponding row electrodes.
SUMMARY OF THE INVENTION
The foregoing and other problems are overcome and the object of the invention is realized by an apparatus in accordance with embodiments of the invention. The present invention features a driving apparatus for a plasma display panel comprising: a group of row electrodes including a plurality of pairs of row electrodes, said group of row electrodes being divided into a plurality of sub-blocks, each of which includes a plurality of row electrode pairs; a group of column electrodes including a plurality of column electrodes extending perpendicularly to said group of row electrodes; a pulse generator provided in each of said sub-blocks for generating a sustain pulse; and an electrode driving circuit provided in each of said sub-blocks for selectively relaying said sustain pulse supplied from an output terminal of said pulse generator to apply the relayed sustain pulse to row electrodes in said each sub-blocks, wherein each of said pulse generators has the output terminal connected to the rest of said pulse generators. Thus, the output levels of pulses supplied from the pulse generators equals to each other.
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Hosoi Kenichiro
Iwami Takashi
Kitagawa Mitsushi
Pioneer Electronic Corporation
Powell Mark R.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Yang Ryan
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