Post on 18-Jan-2016
• Basic Structure
• Discharge Mechanism
• Wall Charge Concept
Drive of PDPDrive of PDP
Bus electrode
Dielectric
ITO electrodeMgO layer
Barrier Phosphors
AddressElectrode
Front panel
Back panel
Cell Structure of PDP
Y1
Y2
Y480
X
X
X
∼
∼
∫
A1 A2 A3 A4 A5 A6 A7
Reference- A1,A2, , , : Address Electrode- Y1,Y2, , , : Scan & Sustain Electrode- X : Common & Sustain Electrode
Electrode arrangement of SD PDP
•Electrode covered with dielectricElectrode covered with dielectric•dielectric limits currentdielectric limits current•emission from both side emission from both side
•Electrode covered with dielectricElectrode covered with dielectric•dielectric limits currentdielectric limits current•emission from both side emission from both side
AC-PDPAC-PDPAC-PDPAC-PDP
V
I
V
I
Vf
Y – X Making of Voltage
(Over Vf)
Y – X Making of Voltage
(Over Vf)
Wall Charge (Stop Discharge)
Wall Charge (Stop Discharge)
X Y
Discharge(Discharge Current)
Discharge(Discharge Current)
X Y
-+
- +
-+
X Y
- - - + + +
Discharge in AC PDP
-
Seed electron
E-Field
Discharge Mechanism - α Process
--+
+-
-+
--+
Seed Electron : After seed electron generated in
discharge space,it is accelerated by Electric field
Seed Electron : After seed electron generated in
discharge space,it is accelerated by Electric field
Electron and Ion are generated by collision
Between accelerated Electron and neutrality particle.
Electron and Ion are generated by collision
Between accelerated Electron and neutrality particle.
Many Electrons and Ions are generated continuously
by collision.
It is end of first Discharge.
Many Electrons and Ions are generated continuously
by collision.
It is end of first Discharge.
Discharge Mechanism - β Process
secondary electron
E-Field
--+
When Ion conflict with Cathode, it is generate
2nd Electron.
(A coefficient of 2nd electron emission)
When Ion conflict with Cathode, it is generate
2nd Electron.
(A coefficient of 2nd electron emission)
Electron and ion are generated from 2nd electron’s
acceleration and confliction.
Electron and ion are generated from 2nd electron’s
acceleration and confliction.
Many Electrons and Ions are generated continuously
by collision.
Many Electrons and Ions are generated continuously
by collision.
+
+ -
-
--+
+
+
--+
--+
--+
--+
Paschen Curve
Repeat of α-process and β-process
→ Space insulation break down by
increasing current
→ Discharge
Self-sustained discharge
Paschen Curve- Start voltage of Discharge
(Vf : Minimum voltage for discharge)
display a curve line of pressure
* A function of an electrode distance.
* Discharge Mechanism & Delay
Repeat of α-process and β-process
→ Space insulation break down by
increasing current
→ Discharge
Self-sustained discharge
Paschen Curve- Start voltage of Discharge
(Vf : Minimum voltage for discharge)
display a curve line of pressure
* A function of an electrode distance.
* Discharge Mechanism & Delay
Wall Charge
X Y
- - - + + +
X Y
X Y
- - -+ + +
Vex
0V
0V
Y
X
Vw1
Vw2
X Y
- - - + + +
X Y
X Y
- - -+ + +
Vw1+Vex
Vex - Vw2
DischargeStart
DischargeStart
NoDischarge
NoDischarge
Vex
It is displayed differential discharge characteristics about same pulse by Wall Charge. : enable a pictureV
I
Vf
Process of Sustain Discharge
Vex
0V
0V
Y
X X Y
- - - + + +
Vw1+Vex
Vex
X Y
-+
- +
-+
X Y
- - - + + +
Vw1
Vex
0V
0V
X
Y
X Y
- - -+ + +
Vex-Vw2
Vw2
X Y
- - -+ + +
Vw2+Vex
Vex
X Y
-+
- +
-+
Make wall chargeMake wall charge Input electric fieldInput electric field DischargeDischarge Sustain dischargeSustain discharge
Extinction of discharge(Wall charge Shield)Make wall charge
Extinction of discharge(Wall charge Shield)Make wall charge
Input electric fieldInput electric field DischargeDischarge Sustain dischargeSustain discharge
• Sub-field Structure
• Frame Structure
1 sub-field Image Process - ADS
ResetReset AddressAddress SustainSustain
Function• Sustain Erase• Wall Charge Set
Issue• Operation margin• Contrast• Short Time
Function• Sustain Erase• Wall Charge Set
Issue• Operation margin• Contrast• Short Time
Function• Select On Cell
Issue• High Speed• Low Voltage• Low Failure
Function• Select On Cell
Issue• High Speed• Low Voltage• Low Failure
Function• Discharge On Cell
Issue• High Efficiency• Low Voltage• ERC Performance
Function• Discharge On Cell
Issue• High Efficiency• Low Voltage• ERC Performance
1 sub-field Process - Reset
1 sub-field Process - Address1
1 sub-field Process - Address2
1 sub-field Process - Address3
1 sub-field Process - Address4
1 sub-field Process - Address5
1 sub-field Process - Address6
1 sub-field Process - Address7
1 sub-field Process - Address8
1 sub-field Process - Address9
1 sub-field Process - Sustain
Frame Structure - ADS
SF1 SF2 SF3 SF4 SF5 SF6 SF7 SF8
1
.....
2
480
128T64T32T16T8T4T2T1T
1TV field (time)scan
line
address
sustain
sub-field
ResetPeriod
AddressPeriod
SustainPeriod
X
Y1
Y2
Yn
D
SF1 SF2 SF3 SF4 SF5 SF6 SF7 SF8Orig
inal Image
1
.....
2
480
128T64T32T16T8T4T2T1T
1TV field (time)scan
line
address
sustain
sub-field
1 Picture Structure by 8 sub-field
一 般
• Reset Period
• Address Period
• Sustain Period
• PDP Drive Pulse
Reset Period
• Sustain elimination dischargea. Very thin Pulse elimination method
b. full width Pulse elimination method
c. Self-erase elimination method
d. Infirm discharge elimination method
• Wall Charge Set-up for Address: Actually, made wall charge profit of Ramp or RC pulse by infirm discharge
• Contrast: To make Back Ground bright interference Contrast
• Drive Margin
• Based action : An address electrode and with a Y-electrode between generate discharge,
Selected cell and not selected cell by Sustain Pulse have different
characteristic with wall charge
Write Address / Erase Address
• Non Address Failure: Address Pulse - Scan Pulse potential difference & Scan width a design
• High speed Addressing: It is important technique for high resolution, high brightness, low cost
Discharge delay reduction by discharge condition improvement and drive waveform
Low voltage Address: It is profitable of cost down by reduce resisting pressure Driver IC.
Address Period
• Pulse form
: Input alternation pulse to X-electrode and Y-electrode
• Reality picture realizable sustain discharge: It is decide sustain discharge of wall charge difference separated with a cell between
by address discharge
Sustain drive Margina. Drive of sustain discharge : decided by Panel’s Vs value
b. The first stage drive : Reset discharge / Made Wall Charge selectivity by Address
discharge and panel’s Vf
Efficiency improve: It is many power consumption and need efficiency improve in Sustain discharge
Sustain Period
PDP Drive Set
Address Buffer BoardAddress Buffer Board
Y Driver Y Driver BoardBoard
X Driver X Driver BoardBoard
PowerPowerSupplySupplyBoardBoard
LogicLogicBoard Board
ImageImageProcessingProcessing
BoardBoard
Scan Buffer
Scan Buffer
Board
Board
Input : AC Power common in useOutput : All voltages of each B’ds
Image signal source
X, Y Control signalA
ddre
ss D
ata
sign
al
RGB & Sync & Clock
Y-output
Scan powerScan signal
Y-output
Scan Pulse
X-output
Addressoutput
Por
t of
Pan
el E
lect
rode
Por
t of
Pan
el E
lect
rode