Samsung PDP4298EDX/SMS, Service Manual

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Circuit Operation Description
5-18 Samsung Electronics
5-4 Driver Circuit
5-4-1 Driver Circuit Overview
5-4-1(A) What is The Definition of Drive circuit?
It is a circuit generating an appropriate pulse (High voltage pulse) and then driving the panel to implement
images in the external terminals (X electrode group, Y electrode group and address electrode), and this high
voltage switching pulse is generated by a combination of MOSFET’s.
5-4-1(B) Panel Driving Principles
In PDP, images are implemented by impressing voltage on the X electrode, Y electrode and address elec-
trode, components of each pixel on the panel, under appropriate conditions. Currently, ADS (Address &
Display Separate: Driving is made by separating address and sustaining sections) is most widely used to
generate the drive pulse. Discharges conducted within PDP pixels using this method can largely be classi-
fied into 3 types, as follows:
(1) Address discharge : This functions to generate wall voltage within pixels to be lighted by addressing
information to them (i.e., impressing data voltage)
(2) Sustain discharge : This means a display section where only pixels with wall voltage by the address
discharge display self-sustaining discharge by the support of such wall voltage. (Optic outputs realiz-
ing images are generated.)
(3) Erase discharge : To have address discharge occur selectively in pixels, all pixels in the panel must
have the same conditions (i.e., the same state of wall and space electric discharges). The ramp reset
discharge section, therefore, is important to secure the drive margin, and methods most widely used
to date include wall voltage controlling by ramp pulse.