EEFL-Backlight Technology

Transcription

Confidential
EEFL-Backlight
EEFL-Backlight Technology
Technology
(End-Cap
(End-Cap Type
Type External
External Electrode
Electrode Fluorescent
Fluorescent Lamp)
Lamp)
KDT m&s Co.,Ltd., Korea
Basic Characteristics of CCFL & EEFL
I-V Characteristics
19″ Lamp(2.6 mm / 393 mm)
CCFL
EEFL
CCFL
Cathode
fall Voltage
EEFL
Operation
10
5
EEFL
CCFL
Operation
CCFL
EEFL
50000
Brightness [cd/m2]
Current [mA] (RMS)
20
15
Confidential
FL
E
E
40000
Operation
30000
CC
FL
20000
10000
Starting
0
0
0
500
1000
1500
Voltage [V] (RMS)
2000
0
1
2
3
4
5
Power [W]
6
7
8
Basic Characteristics
Multi-CCFLs
Confidential
Multi-EEFLs
Co
• Co : Ballast Capacitor
for the Uniformity
• Good Uniformity
EEFLs for the High Brightness & High Efficiency
Confidential
Key Issues ;
1st. Switching Inverter generating AC-Square Pulses
2nd. Driving Methods of Self-Discharge Synchronizing
3rd. New External Electrode Formation Scheme
: Metal-Glass Melt-Bonding Technology provides
High Capacitance
Lamp Operation
Confidential
CCFL (LC-Resonance Inverter)
EEFL (Switching Inverter)
V
V
t
t
I
I
t
t
- Self-Discharge Synchronized for high Efficiency
- V-I Phase Synchronized (Zero Crossing)
Current
Current
[+]
Direct
[+]
(i) Rising Voltage
[-]
[-]
(ii) Sustaining Voltage
Wall Charge
Current
[+]
v
[-]
Direct
Current
[-]
[+]
(iii) Falling Voltage
[G]
v
Self-Discharge Current
[G]
Switching Inverter
Confidential
• Full-Bridge Circuit
• Half - Bridge Circuit
Multi lamps
Multi lamps
Vcc
A
C
B
D
• Push-Pull Circuit
Vcc
A
C
B
C
• AStable Multi - Vibrator
Multi lamps
Multi lamps
Vcc
A
Vcc
B
amp
amp
EEFL Driven by a Switching Inverter
- 19″Lamp
Confidential
- EEFL(Switching Inverter)
50000
EEFL(Switching
Inverter)
Brightness [cd/m2]
40000
CCFL(LC-Resonance
Inverter)
30000
i) Voltage (2kV/Div.)
DUty = 50%
25µs
Vp
(40 kHz)
12.5µs
EEFL(LC-Resonance
Inverter)
Main & Self
20000
ii) Current (100mA/Div.) Discharge
Overlapped
10000
iii) Optical Signal
0
0
1
2
3
4
5
6
Power [W]
7
8
9
10
5µs
Duty = 24%
Confidential
Duty = 40%
25µs
(40 kHz) Vp
25µs
Vp
(40 kHz)
10µs
6µs
10µs
12.5µs
ii) Current (100mA/Div.)
iii) Optical Signal
Main
Discharge
Self
Discharge
Main
ii) Current (100mA/Div.) Discharge
iii) Optical Signal
Self
Discharge
a) Rising Voltage
Confidential
Self-discharge Synchronizing Point
Main-discharge Current
-
(+)
+
(-)
VP
Voltage
tP
Vp
tr
t
Current
(Synchronize)
b) Sustaining Voltage
Wall charge
(+)
tf
Wall charge Vw
----
Wall charge
++
+
+++
Vw
t
(-)
Current
(Delayed)
t
Delayed
c) Falling Voltage
-
-
Self-discharge Current
-
+
+
+
+
+
Current
(Over Current)
Over Current
t
Confidential
Self-Dischage Synchronized Wave Formulas
b) Over-Shot
a) Rounded Wave
Synchronizing Point
V
Synchronizing Point
V
t
t
I
I
t
t
C) Sloped
d) Sawtooth
Synchronizing Point
V
Synchronizing Point
V
VP
t
I
t
I
t
t
EEFL Electrode Structure
Confidential
Electrode Length
ℓ
•
L
Optimum Electrode Length
5
ℓ
ℓ
ℓ
ℓ
ℓ
ℓ
Brightness [cd/m2]
40000
35000
=
=
=
=
=
=
1cm
1.5cm
2cm
2.5cm
3cm
3.5cm
ℓ = 2.5cm
ℓ = 3cm
ℓ=3.5cm
30000
ℓ = 2cm
25000
ℓ = 1.5cm
20000
ℓ = 1cm
15000
10000
Optimum Length [cm]
45000
4.0
4
3.0
3
2
1.8
1
Lamp length : 375mm
5000
0
0
0
2
4
6
Power [w]
8
10
0
20
40
60
80
Lamp Length [cm]
100
Confidential
▶ Electrode Formation Methods
1) Metal Cap ( Copper Cap )
2) Metal Foil Taping
3) Metal Plating
4) Metal–Glass Melt-Bonding
Copper Cap
Cu-Taping
Metal-Bonding
Metal-Bonding
Al-Paste
Confidential
60
50000
45000
Ag melt-bonding
Al melt-bonding
Al-taping
Cu-taping
40000
45000
50
40000
30000
Bonding
25000
20000
15000
Taping
10000
35000
40
30000
30
25000
20000
20
15000
10000
5000
5000
0
0
0
1
2
3
4
Power [W]
5
6
7
EEFL (Ag melt-bonding)
conventional CCFL
10
0
2
4
6
Power [W]
8
10
Efficiency [lm/w]
Brightness [cd/m2]
Brightness [ cd/m2]
35000
Metal–Glass Melt–Bonding Technology
• Metal–taping
(Low Capacitance)
(+)
Confidential
• Metal–glass melt–bonding
(High Capacitance)
(+)
Metal-tape
metal
Irregular space
(high field)
Glass
polarization
Glass
polarization
Wall charge
Wall charge
+
Wall charge
Wall charge
+
Various EEFL-Lamps
Confidential
-Color EEFL Lamps
Various EEFL-Lamps
Confidential
Various EEFL-Lamps
Confidential
450 mm
393 mm
355 mm
314 mm
291 mm
1000 mm
EEFL–Edge Lighting Backlight
Confidential
2) Bended Electrode
1) Elongated Bottom Electrode
Dead Zone(~0.8cm)
Lamp
Reflector
LGP
Lamp
Reflector
LGP
EEFL–Backlight ( Edge–Lighting )
Confidential
19″Panel
17″Panel
Reflector
Full-Bridge Switching Inverter
( 12 * 3 * 1 ) (cm)
Multi-Vibrator Switching Inverter
( 15 * 3 * 1 ) (cm)
EEFL–Direct Lighting Backlight
Confidential
Type1 : Electrodeless Lamps Type2 : Elongated EEFLs
Electrodeless Lamp
Type3:Bended EEFLs
Elongated
Lamp
Hole
Lamp
Hole
Lamp Connector
(Conductive Lubber Inside Hole)
Lamp Connector
(Copper Inside Hole)
- Simple Connection
- Low Efficiency ~50 lm/W
- Narrow Dead Zone
- High Efficiency ~ 60 lm/W
Lamp
Hole
Lamp Connector
(Copper Inside hole)
- Narrow Dead Zone
- High Efficiency ~ 60 lm/W
EEFL–Backlight ( Direct–Lighting )
20.1″ Panel
Confidential
Diffusion Plate Opened
( 12 * 3 * 1 ) (cm)
( 9.5 * 4.8 * 1 ) (cm)
EEFL–Backlight ( Direct–Lighting )
Full bridge Switching Inverter
( 12 * 3 * 1 ) (cm)
12 - EEFLs
Confidential
Multi-Vibrator Switching Inverter
( 15 * 3 * 1 ) (cm)
12 - EEFLs
iii) Optical Signal
iii) Optical Signal
EEFL-Backlight ( Direct –Lighting )
Confidential
Cu-Taping Electrode
64
63
17 Inch panel
12000
20 Inch panel
Efficiency
11000
60
Efficiency
57
9000
54
8000
Brightness
Brightness
58
56
7000
2
2
51
7500
Brightness [ cd/ m ]
10000
Efficiency [ lm/W ]
60
Brightness [ cd/ m ]
Efficiency [lm/W]
8000
62
54
7000
52
48
6500
6000
50
45
5000
40
45
50
55
60
Frequency [kHz]
65
70
40
45
50
55
60
Frequency [kHz]
65
70
Confidential
20.1 Inch (Input : 12V) : Metal-Bonding Electrode
Ef
2
Brightness [cd/m ]
6.0
Input Current [A]
5.5
12V
5.0
y
nc
ie
fic
10000
6.5
9000
8000
12V
7000
6000
5000
4.5
4000
4.0
3000
20
3.5
s
es
n
t
gh
Bri
11000
Maximum
30
40
50
60
Power [w]
3.0
2.5
2.0
9
10
11
12
13
Input Voltage [V]
14
70
80
82
80
78
76
74
72
70
68
66
64
62
60
58
56
54
52
90
Efficiency [lm/W]
Frequency
Confidential
20.1 Inch (Input : 24 V) : Metal-Bonding Electrode
Frequency
84
Maximum
10500
9500
24V
78
9000
76
8500
74
s
es
n
ht
ir g
B
8000
7500
2.3
72
70
7000
2.2
35
2.1
40
45
50
55
Power [W]
2.0
1.9
1.8
20
21
22
23
Input Voltage [V ]
24
25
60
65
Efficiency [lm/W]
Brightness [cd/m 2 ]
Input Current [A]
2.4
80
cy
24V
2.5
en
ci
2.6
82
fi
Ef
10000
Confidential
17 Inch (Input :12V) : Metal-Bonding Electrode
Frequency
74
14000
Maximum
4.5
Input Current [A]
4.0
12V
12V
ici
en
cy
s
es
n
t
gh
Bri
72
70
68
10000
66
8000
64
62
6000
60
3.5
58
4000
20
3.0
30
40
Power [W]
2.5
2.0
9
10
11
12
Input Voltage [V]
13
14
50
60
Efficiency [lm/W]
2
Brightness [cd/m ]
12000
E ff
EEFL–Backlight specification
Confidential
- Metal Bonding External Electrode
Conventional
Edge-Lighting
Direct Lighting
panel
17 inch
38.4*28*2(cm)
17 inch
38.4*28*2(cm)
20.1 inch
44.5*31*2(cm)
Tubes
4- lamps
12 - lamps
14 - lamps
Inverter
size
LC-Resonance
16*4.5*1 (cm)
Full Bridge
12*2.8*1(cm)
Full Bridge
9.5*4.8*1(cm)
Input
12V/ 1.7A
12V/ 3.61A
12V/ 4.68A
24V/ 2.48A
Input
Power
20 W
43 W
56 W
59 W
Frequency
50 KHz
56 KHz
53 KHz
59 KHz
Brightness
3,500 cd/m2
11,000 cd/m2
8,650 cd/m2
10,300 cd/m2
Efficiency
50 lm/W
70 lm/W
64 lm/W
73 lm/W
A large Area Backlight about 40 inch in diagonal
A Section
Phase Synchronized
B Section
Gate Signal Generator
C Section
Confidential
Multi-CCFLs Driven by a Switching Inverter
Confidential
- Self Discharge Synchronizing provides a high Efficiency
a) Rising Voltage : Charging Capacitor
+
+
Co
Vc
Vr-Vc
-
+
+
Q=CoVc
-
Q=Cℓ(Vr-Vc)
Vp
Vr
b) Rising & Sustaining : Main discharge ( Vr – VC 〉Vf )
Main-discharge Current
Q=CoVP
---
+
+
+
+
+
-
+
-
VP
Vp
c) Falling Voltage : Charging Lamp
+
+
+
+
--
-
-
+
+
Q/Cℓ=Vℓ
VP→0
d) Falling Voltage ( Vℓ〉Vf ) : Self-discharge
Self-discharge current
-
+
• Co : Synchronizing Capacitor
for the Uniformity
VP→0
-
+
-
+
Multi-CCFLs Driven by a Switching Inverter
Confidential
- Self-discharge in Multi-CCFLs
with an optimum Ballast Capacitor
(a) Co = 47 pF
(Without Self-discharge)
Duty = 24 %
Duty = 24 %
Main
Discharge
iii) Optical Signal
(b) Co = 18 pF (With Self-discharge)
iii) Optical Signal
Main
Discharge
Self
Discharge
CCFL Backlight ( Direct–Lighting )
1) Full bridge Switching Inverter
2) Multi-Vibrator Switching Inverter
( 12 * 3 * 1 ) (cm)
• 12 – CCFLs : 17 inch Panel
Confidential
( 15 * 3 * 1 ) (cm)
• 12 – CCFLs : 17inch Panel
iii) Optical Signal
iii) Optical Signal
Conclusions
Confidential
1. High Brightness & High Efficiency EEFLs ;
- External Electrode Formulated by Metal-Glass Melt-Bonding
- A Self-Discharge Synchronizing Operation
- By a Switching Inverter
2. Edge-Lighting EEFLs-Backlight Panels ;
- A good Uniformity obtained with single Transformer
on a single Stage Inverter.
3. Direct-Light EEFLs-Backlight Panels of 17 & 20.1 inch in Diagonal
- High Luminance of 7,000 ~ 10,000 cd/m2
- High Efficiency of 70 ~ 80 lm/w
(With single Transformer on a single Stage Inverter.)
Confidential
EEFL-Backlight & Switching Inverter promise
a new generation of LCD Backlight & Operation
-
Low Power consumption
Long Life Time
High Brightness Backlight Up to ~ 10,000 cd/m2
High Efficiency Up to ~ 70 lm/W
Application to a Large Size Backlight Up to 1m×1m inch LCD
Low Cost
Simple Assembly
< Ref from Presentation at SID’02 Boston by KDT >

EEFL-Backlight Technology

Transcription

Similar documents