TC-42P1F, TC-42P1, TC-42PD1, TC-42PD1F, TC-42P1FA, TC-42PD1FA, TC-37P1F, TC-37P1, TC-37PD1, TC-37PD1F - Panasonic TV Service Manual (repair manual). Page 6

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Fig. M

When sustain pulse is stopped, Ions and Electrons are
remained again as Wall voltage. However polarity of wall volt-
age is reversed.

Fig. N

Ions and Electrons which is generated by 2nd sustain dis-
charge are charged on the pixel wall (dielectric) around the
electrodes.

Fig. O

To keep discharge continuously step 1 to 5 operation will be
repeated.
As the result sustain pulse is alternated. Therefore we call
this drive system AC Drive type.

If  sustain operation is repeated longer, brightness level of
the pixel is increased. Therefore depend on sustain dis-
charge time brightness of pixel is controlled.

Fig. P

Sub-Field drive is PDP unique system.
While one TV field period, 8 bits digital video signal compo-
nent is reproduced by 8 sub-fields operation.
Each Sub-Field’s  address period are all same.(Consist of
one initialization and 480 scanning operation.)
But Sustain period of each Sub-Field are different.
1st Sub-Field (SF) reproduce only 1 step brightness.
2nd SF reproduce 2 steps  brightness.  
Each sub-field’s sustain period are increased gradually.
However total 256 brightness difference can be reproduced
on the screen.

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Vs

Sustain Cycle   

AC Drive Type Plasma Display

Sustain Pulse

Address Period

8 Sub Fields

1 TV Field 

1

2

4

8

16

32

84

128

=

1st 2nd 3nd 4th

5th

6th

7th

8th

Sustain Period