Dual Scan; Plasma Ai (Adaptive Brightness Intensifier); Real Black Drive - Panasonic TH-50PHD3 Service Manual

TH-50PHD3 / TH-50PHW3

1.17. Dual Scan

The sustain period of sub-field drive system. Therefore
brightness peak is limited. Because 768 horizontal lines
scanning is carried out during address period.
Dual scan system can reduce scanning time from 768 to 384 in
the address period.
Then spaced time by dual scanning can be used for sustain
operation.
As the result Brightness peak level can be increased.
1.18. Plasma AI (Adaptive
brightness Intensifier)
Panasonic plasma AI control sub-field drive operation which is
called Multi-Sprit Sub-Field drive control system.
Depend on the picture contents ( APL : Average Picture Level
) sustain time format of each sub-field are also rearranged from
binary format to linear cording sustain time. (Linear coding sub-
field)
Plasma AI select the best display condition for Plasma display
panel to display natural and crisp picture.
Fig. Q
Fig. R

1.19. Real Black drive

For standard sub field drive, initialization discharge is done at
each sub field. So that during one TV field period same sub
field numbers of discharges are done even black signal was
displayed.
Therefore there are small emission at the black area.
Panasonic Real Black
reproduction.
Initialization discharge is done at first sub field only.
Remaining sub field are not required discharge because Real
Black drive circuit applies initialization electric field remainder
pulse.
8
Fig. S
drive system improve black