Pixel Structure; Sub Field Drive System - Panasonic TC-42P1 Service Manual

Pixel Structure

Color Phosphor
Data Electrode
Dielectrics
Aluminum
Base
Rear Glass
Fig. E
37/42 inch plasma display panel has 1,226,880 pixels.
Each pixels structure is shown fig. E.

Sub Field Drive system

Initialize Write
Address
Period
Sub Field
Brightness control of plasma display panel is carried out by
plasma discharge time change. To control each pixel's bright-
ness Sub-field drive system is used.
A sub-field is consist of Initialize, Write and sustain opera-
tion.
Rib
Scan Electrode
Xenon
+
Neon
Sustain Electrode
Rib
Front Glass
Sustain
Sustain
Period
Fig. F
Initialization
To clear any remaining electric charge into the pixel, trape-
zoid voltage is applied between the scan and sustain elec-
trodes.
Plasma discharge is started but the discharge become small
gradually.
Then any electric charge is cleared.
Write
Data Pulse
+ Ions
- Electrons
Data Pulse which is positive polarity is input to data electrode
and Scan pulse which is negative polarity is input to scan
electrode simultaneously.
That means sum of data and scan pulses voltage is applied
between two electrodes as discharge start voltage.
Discharge is started into the pixel and gas is ionized.
During discharging ion is charged on the scan electrode side
and electron is charged on data electrode side.
- 4 -
VI
Fig. G
Scan Pulse
Fig. H