Panasonic TC-42P1 Service Manual

Also see for Viera TC-42P1: Operating instructions manual

Contents

- 6 -Sustain Step 4Fig. MWhen sustain pulse is stopped, Ions and Electrons areremained again as Wall voltage. However polarity of wall volt-age is reversed.Sustain Step 5Fig. NIons and Electrons which is generated by 2nd sustain dis-charge are charged on the pixel wall (dielectric) around theelectrodes.Repeat Step 1 to Step 5Fig. OTo keep discharge continuously step 1 to 5 operation will berepeated.As the result sustain pulse is alternated. Therefore we callthis drive system AC Drive type.If sustain operation is repeated longer, brightness level ofthe pixel is increased. Therefore depend on sustain dis-charge time brightness of pixel is controlled.Sub-Field driveFig. PSub-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 ofone 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 reproducedon the screen.+++ | | |+++ | | |+++ | | |VsSustain CycleAC Drive Type Plasma DisplaySustain PulseAddress Period8 Sub Fields1 TV Field1 2 4 8 16 32 84 128=1st 2nd 3nd 4th 5th 6th 7th 8thSustain Period