Kortek corporation
30
of
99
PDP R&D Center
(3) DISCHARGE OF DRIVE
Ⅰ. Sustaining Discharge:
It refers to a section where pixel, whose wall voltage has been generated just by addressing
discharge, generates discharge spontaneously by virtue of the wall voltage.
It is a Self Sustaining Discharge made by combining electric potential of sustaining pulse (usually
160~170Volt) alternated to X electrode and Y electrode during sustaining with wall voltage of which pixel
condition depends on whether discharge was generated before. In other words, it is operated by Memory
property, AC PDP
’
s basic property (the present condition is defined by the past operation condition). If wall
voltage had existed on a pixel before (if a pixel had been ON), discharge would have been generated again
because voltage over the earlier voltage for discharge were generated by a total of the next applied
sustaining voltage and wall voltage. However, if wall voltage had not existed on a pixel before (if a pixel had
been OFF), discharge would not been generated because voltage over the earlier voltage for discharge could
not have been generated just by sustaining voltage. Sustaining discharge is a section where substantial
optical output displaying image is generated.
Ⅱ. Addressing Discharge
:
It is a work to generate wall voltage to a pixel to give information (apply data voltage) to a pixel which will be
lighted.
The discharge is generated by the difference of Address electrode
’
s positive electric potential (usually Va,
applied voltage of 70~75V + Positive Wall Charge) and Y electrode
’
s negative electric potential (applied
GND Level + Negative Wall Charge). Addressing discharge plays a role to generate wall voltage to a pixel
displaying image (generating discharge) before sustaining discharge section. The pixel whose wall voltage
has been generated by addressing discharge generates sustaining discharge by the next sustaining pulse.
Ⅲ. Erasing Discharge
:
Initializing (erasing) discharge aims at equalizing wall voltage in pixels of the overall panel.
To be optional addressing discharge for each pixel, the pixels of the whole panel should be under the same
condition (the condition of wall charge and the condition of space charge). Erasing discharge section is an
important factor to secure driving margin and it is applied most to the method controlling wall voltage with
Ramp waveform. The differences of wall voltage should be uniformed according to whether sustaining
discharge existed or not. In other words, the wall voltage generated by sustaining voltage should be removed
and when wall voltage is removed, discharge should be necessarily generated to supply ions and electrons.
The method to remove wall voltage is by generating discharge to limit time at which the polarity of wall
voltage is charged adversely (narrow erase) or its polarity should be prevented from being charged
adversely by supplying appropriate quantity of ion or electron after generating weak discharge (low low-
voltage erase)
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