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EN 44
9.
S/SD/HD 3.1 PDP
9. Circuit Descriptions
9.1
Main function of Each Assembly
9.1.1
X-main board
The X-main board generate a drive signal by switching the FET
in synchronization with logic
main board timing and supplies the X electrode of the panel
with the drive signal through the
connector.
1. Maintain voltage waveforms (including ERC)
2. Generate X rising ramp signal
3. Maintain Ve bias between Scan intervals
9.1.2
Y-main board
The Y-main board generate a drive signal by switching the FET
in synchronization with the logic
Main Board timing and sequentially supplies the Y electrode of
the panel with the drive signal
through the scan driver IC on the Y-buffer board. This board
connected to the panel's
Y terminal has the following main functions.
1. Maintain voltage waveforms (including ERC)
2. Generate Y-rising Falling Ramp
3. Maintain V scan bias
9.1.3
Logic main board
The logic main board generates and outputs the address drive
output signal and the X ,Y drive signal by processing the video
signals. This Board buffers the address dirve output signal and
feeds it to the address drive IC (COF module, video signal- X Y
drive signal generation , frame memory circuit / address data
rearrangement).
9.1.4
Logic buffer(E,F)
The logic buffer transmits data signal and control signal.
9.1.5
Y-buffer board (Upper, Lower)
The Y-buffer board consisting of the upper and lower boards
supplies the Y-terminal with scan waveforms. The board
comprises 8 scan driver IC's (ST microelectronics STV 7617 :
64 or 65 output pins) , but 4 ICs for the SD class.
9.1.6
AC Noise Filter
The AC Noise filter has function for removing noise(low
Frequency) and blocking surge. It effects Safety standards
(EMC,EMI).
9.1.7
TCP( Tape Carrier Package )
The TCP applies Va pulse to the address electrode and
constitutes address discharge by the potential difference
between the Va pulse and the pulse applied to the Y electrode.
The TCP comprise 4 data driver Ics(STV7610A :96 pins output
pins) 7 TCPs are required for signal scan.
Circuit Descriptions
9.2
Abbrevitation
TCP
Tape Carrier Package
FFC
Flat Foil Cable (connection)
COF
Circuit on Foil
FPC
Flexible Printed Circuit
Vsc H or Vsc L
V Scan High or Low
SF
Sub Frame
Vset RR
Vset Raising Ramp (Flat time)
Vset FR
Vset Falling Ramp (flat time)
VR
Variable resistor
YBU & YBL
YBM
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