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Basic Principle of Plasma Display Panel
Prof. Heung-Sik TaeSchool of Electronic and Electrical Engineering,
Kyungpook National University
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Contents
• What is the ‘Plasma Display Panel’?
• Principle of AC-PDP
• Driving Mechanism
• Image in PDP
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Section 1: What is the ‘PDP’?
• Definition of PDP
• What is ‘plasma’?
• Plasma 의 특징
• Applications of PDP
• Advantages of PDP
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What is the ‘PDP’?
Plasma: 플라즈마 현상이용
Display: 문자 및 영상표시
Panel : 플라즈마 생성환경조성 및 픽셀형성
Definition
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What is the ‘PDP’?
What is ‘Plasma’?
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What is the ‘PDP’?
I. 제 4의 물질상태
II. 전기적으로 준 중성상태를 유지
III.다수의 전자(-)와 이온(+)들의 집합체
IV.집단운동(collective behavior)
Plasma의 특징
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What is the ‘PDP’?
Home Public Commercial
Entertainment Industrial Business
Applications of PDP
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What is the ‘PDP’?
Large screen Thin Lightweight
Wide viewing angle Good Uniformity Distortion-Free with M.F.
Advantages of PDP
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Section 2: Principles of PDP
• Gas Discharge
• Structure of AC-PDP
• Gas in PDP
• Basic of AC discharge
• Emission of VUV
• Definition of Phosphor
• Spectrum of Visible light
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Principles of PDP
기체 방전(애니메이션)
::전자전자 ::중성자중성자 ::이온이온
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Principles of PDP
기체 방전C
atho
de Anode
N
N
N
E
N
+
+
+
+
γ-process(ion, excited species)
α-process(electron)
N
+
E
: Electron: Ion: Neutral species: Excited species
E
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AC Type PDP
Principles of PDP
방전공간에방전공간에 형성되는형성되는 전계의전계의 방향이방향이 계속계속 바뀐다바뀐다..
구조가구조가 간단하다간단하다..
전극이전극이 방전공간으로부터방전공간으로부터 보호되어보호되어 있다있다..
=>=>전극재료의전극재료의 선택폭이선택폭이 넓고넓고 수명이수명이 길다길다..
현재현재 상용화상용화 되어있는되어있는 구조구조..
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Structure of AC PDP
Principles of PDP
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Structure of AC PDP(상판부분)
투명전극투명전극::방전공간에방전공간에 전계를전계를 형성시켜주는형성시켜주는 역할역할
버스전극버스전극::투명전극의투명전극의 저항을저항을 줄여주는줄여주는 역할역할
유전체층유전체층::메모리메모리 기능을기능을 가능하게가능하게 해준다해준다..
MgOMgO층층::이온충돌로부터이온충돌로부터 유전체를유전체를 보호한다보호한다..
Principles of PDP
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Structure of AC PDP(하판부분)
격벽격벽::방전공간을방전공간을 형성시켜주며형성시켜주며 상호혼신을상호혼신을 방지한다방지한다..
형광체형광체:VUV:VUV로부터로부터 가시광가시광 생성시킨다생성시킨다..
어드레스전극어드레스전극::각각의각각의 픽셀에픽셀에 영상데이타를영상데이타를 기입하는기입하는 역할역할
Principles of PDP
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Principles of PDP
PDP에 사용되는 Gas
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Wall chargePolarization of dielectric (유전체의 분극)
AC 방전의 기초
Principles of PDP
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0V 220V 0V 220V
AC 방전의 기초
50V 0V 180V 0V
• Wall charge
Principles of PDP
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Principles of PDP
CCD CCD 이미지이미지
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Principles of PDP
+180V
0V
Simulation of discharge(2D) & CCD image(동영상)
Simulation (side view) Simulation (side view) CCD image (top view)CCD image (top view)
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Principles of PDP
Xe**
Xe*(3P1)
Xe*(3P2)
150173
v=0
v>00u
+
0g+
828823
1471u,0u-
Xe+He(96%)+Xe(4%) Ne(96%)+Xe(4%) Ne+He+Xe(4%)
140 150 160 170 180 190
0.0
5.0x105
1.0x106
1.5x106
2.0x106
2nd continuum1st continuum
147nm from Xe(1s4)->Xe(1s0)
Inte
nsity
[A.U
.]
Wavelength[nm]
Xe의 방출 스펙트럼
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Host lattice+Activator(Y2O2) (Eu)
형광체의 정의
Principles of PDP
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Principles of PDP
형광체의 발광 원리
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300 400 500 600 700 8000.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
Ne
Red
GreenBlue
Inte
nsity
Wavelength [nm]
가시광의 스펙트럼 Red, Green, Blue (PDP)
Principles of PDP
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·· PDP Driving schemePDP Driving scheme
·· Necessity of Reset PulseNecessity of Reset Pulse
·· Driving scheme Driving scheme
Using Strong Discharge ResetUsing Strong Discharge Reset
Ramp Pulse with Wall VoltageRamp Pulse with Wall Voltage
·· Driving scheme using Ramp ResetDriving scheme using Ramp Reset
Section 3: Driving Mechanism
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Vs
-Vs
Vf
-Vf
Output
(a)(b)(c)(d)(e) (f) (g) (h)
Wall Voltage
Input PulseVoltage
PracticalVoltage
Driving Mechanism
PDP Driving scheme
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Driving Mechanism
Vs
-Vs
Vf
-Vf
Output
(a)(b)(c)(d)(e) (f) (g) (h)
Wall Voltage
Input PulseVoltage
PracticalVoltage
PDP Driving scheme
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• Reset and Erase step
– Strong discharge reset (Pulse reset)
– Ramp reset
• Address step
• Sustain step
PDP Driving step
Driving Mechanism
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Erasing of wall chargesErasing of wall charges made by previous discharge and set-up wall charge to do addressing discharge.
Reducing the discharge voltage differenceReducing the discharge voltage difference in PDP cell
Reducing of background lightReducing of background lightImprove the contrast ratio
For Low address voltageLow address voltage
Necessity of Reset
Driving Mechanism
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• Erasing wall charge
– Narrow width pulse
– Low voltage pulse
– Ramp pulse
• Redistribution of wall charge
– Self-erasing discharge (using strong discharge)
– Ramp pulse (using weak discharge)
Reset pulse
Driving Mechanism
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100V 0V
0V
180V 50V
0V
180V 0V
50V
①① ②② ③③ ④④ ⑤⑤
Strong discharge reset
Driving Mechanism
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Strong Discharge Reset
Driving Mechanism
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• Merits
– Short reset time
– Redistribution of wall charges
• Defect
– High driving voltage
– Self-erasing discharge
– Low contrast ratio
Merit & Defect in strong discharge reset
Driving Mechanism
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VR 0VX Y
0V0V
Applied Voltage
Wall Voltage
Vf
Vf
VW = Vf
VR
[V]
Time0
Light
V1
Vf
V2
1 2 3 4 5 6 7
Ramp waveformRamp waveform
Driving Mechanism
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X
Y
A
VeVe Vs
VsetGND
GND
GNDReset & Erasing
Vsc
Va
Address Sustain
Matsushita Driving pulse
Driving Mechanism
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Y
X
A
VeVe
VsetGND
GND
GND
Vsc
Va1 2 3 4 5 6 7 8
Vs
Matsushita Ramp reset mechanism
Driving Mechanism
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• Merits
– High contrast ratio (Weak discharge)
– Strong Redistribution of wall charges
– Low address driving voltage
– Stable
• Defect
– Long reset time
– High reset voltage
Merit and Defect of Matsushita Ramp reset
Driving Mechanism
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Y1
Y2
Y3
Y4
Y5
A1
A2
A3
A4
time
1 2 3 4 5
Modeling of Address step
Driving Mechanism
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Section 4: Expression of image in PDP
• Pulse Number Modulation Driving
• Luminance Control in PDP
• Wall Charge
• Line-by-Line Scanning, Matrix Driving
• Subfield Method
• Block Diagram of Signal Circuit in PDP
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• Cathode Ray Tube :
• Plasma Display Panel :
Pulse Number Modulation Driving
Expression of image in PDP
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• CRT : Control the Luminance using Electron Beam Intensity
• PDP : Control the Luminance using Number of Light Pulses
Luminance Ratio2 : 1
Luminance Ratio2 : 1
Luminance Control in CRT and PDP
Expression of image in PDP
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8 Bit Binary Code 8 Subfield
Expression of image in PDP
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Expression of image in PDP
8 Bit Binary Code8 Bit Binary Code
8 8 SubfieldsSubfields
256256단계의단계의
밝기조절밝기조절 가능가능
16,777,21616,777,216가지의가지의
색을색을 만들만들 수수 있다있다..
R(256)R(256)
G(256) G(256)
B(256)B(256)
16,777,21616,777,216
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8 Bit Binary Code 8 Subfield
Expression of image in PDP
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Addressing (셀 선택)
Expression of image in PDP
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ON/OFF State Selection
Expression of image in PDP
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Sustain Discharge
Expression of image in PDP
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WallCharge
Effect of Wall Charge
Expression of image in PDP
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• Cathode Ray Tube : Cell-by-Cell Scanning
• PDP : Line-by-Line Scanning
Line-by-Line Scanning
Expression of image in PDP
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Expression of image in PDPMatrix Driving
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Composition of 1 Subfield
Expression of image in PDP
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Expression of image in PDP8 Subfield in 1 TV-Field (ADS)
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• Analog Video Signal Digital Pulse Signal
Video Signal Processing
Expression of image in PDP
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Original Image SF1 SF2 SF3
SF4 SF5 SF6 SF7 SF8
Subfield Method – Example (Addressing)
Expression of image in PDP
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Original Image SF1 SF2 SF3
SF4 SF5 SF6 SF7 SF8
Subfield Method – Example (Displayed)
Expression of image in PDP
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Future Work
• High luminance efficiency
(목표: 5 lm/W)
• High image quality
(color temperature, contrast ratio,
dynamic false contour, image sticking)
• Low cost
(materials, manufacturing processes)