EEFL-Backlight Technology - .Basic Characteristics of CCFL & EEFL Confidential I-VCharacteristics

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Confidential

EEFL-Backlight Technology(End-Cap Type External Electrode Fluorescent Lamp)

EEFL-Backlight Technology(End-Cap Type External Electrode Fluorescent Lamp)

KDT m&s Co.,Ltd., Korea

ConfidentialBasic Characteristics of CCFL & EEFL Basic Characteristics of CCFL & EEFL

I-V Characteristics 19 Lamp(2.6 mm / 393 mm)

0 1 2 3 4 5 6 7 80

10000

20000

30000

40000

50000

Brig

htne

ss [c

d/m

2 ]

Power [W]

CCFLEEFL

EEFL

CCFLOperation

0 500 1000 1500 20000

5

10

15

20CCFLEEFL

Starting

CCFL

Cur

rent

[m

A] (

RM

S)

Cathode

fall Voltage

CCFLOperation

EEFL Operation

EEFL

Voltage [V] (RMS)

ConfidentialBasic Characteristics Basic Characteristics

Multi-EEFLsMulti-CCFLs

Co

Co : Ballast Capacitorfor the Uniformity

Good Uniformity

ConfidentialEEFLs EEFLs for the High Brightness & High Efficiencyfor the High Brightness & High Efficiency

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

ConfidentialLamp Operation Lamp Operation CCFL (LC-Resonance Inverter) EEFL (Switching Inverter)

- V-I Phase Synchronized (Zero Crossing)(i) Rising Voltage

[+] [-]Current

(ii) Sustaining Voltage Wall Charge

[G] [G]

Self-Discharge Current

[+] [-]

Current

(iii) Falling Voltage

V

I

tV

t

[+] [-]CurrentDirect

v

I

t

- Self-Discharge Synchronized for high Efficiency

t

Current

Direct

v

[-] [+]

ConfidentialSwitching Inverter Switching Inverter

A

B

C

D

Multi lamps

Vcc

A

B

C

C

Multi lamps

Vcc

Full-Bridge Circuit Half - Bridge Circuit

Push-Pull Circuit AStable Multi - Vibrator

Vcc

amp amp

Multi lampsMulti lamps

A BVcc

ConfidentialEEFL Driven by a Switching Inverter EEFL Driven by a Switching Inverter

- 19Lamp - EEFL(Switching Inverter)

25s(40 kHz) 12.5s

5s

DUty = 50%

ii) Current (100mA/Div.)

iii) Optical Signal

Main & Self Discharge

Overlapped

i) Voltage (2kV/Div.)

Vp

0 1 2 3 4 5 6 7 8 9 100

10000

20000

30000

40000

50000

Power [W]

EEFL(Switching

Inverter)

EEFL(LC-Resonance

Inverter)

Brig

htne

ss [

cd/m

2 ] CCFL(LC-ResonanceInverter)

ConfidentialEEFL Driven by a Switching Inverter EEFL Driven by a Switching Inverter

25s(40 kHz)

Main Discharge

Self Discharge

10s

Duty = 40%

ii) Current (100mA/Div.)

iii) Optical Signal

i) Voltage (2kV/Div.)

10sVp

i) Voltage (2kV/Div.)

ii) Current (100mA/Div.)

iii) Optical Signal

Duty = 24%

25s(40 kHz)

6s

Main Discharge

Self Discharge

12.5s

Vp

ConfidentialEEFL Driven by a Switching Inverter EEFL Driven by a Switching Inverter

a) Rising Voltage

+-

Main-discharge Current

VoltageVP

tr

tPtf

Vp

(+) (-)

(+)

Wall charge Vw++++++

----- - (-)

Wall charge Wall charge

Vw

b) Sustaining Voltage

c) Falling Voltage

+++

---

++

--

Self-discharge Current

t

Current(Synchronize)

Current(Delayed)

t

t

Current(Over Current)

Self-discharge Synchronizing Point

Delayed

Over Current

t

ConfidentialEEFL Driven by a Switching Inverter EEFL Driven by a Switching Inverter

Self-Dischage Synchronized Wave Formulas

b) Over-ShotSynchronizing Point

a) Rounded Wave

t

t

V

I

Synchronizing PointV

t

I

t

C) Sloped d) Sawtooth

Synchronizing Point Synchronizing PointV VVP

t t

II

tt

ConfidentialEEFL Electrode Structure EEFL Electrode Structure

L

Electrode Length

Optimum Electrode Length

0 2 4 6 8 100

5000

10000

15000

20000

25000

30000

35000

40000

45000

Brig

htne

ss [

cd/m

2 ]

Power [w]

1cm1.5cm2cm2.5cm3cm3.5cm

= = = = = =

=3.5cm

= 3cm

= 2.5cm

= 2cm

Lamp length : 375mm

0 20 40 60 80 1000

1

2

3

4

5

Opt

imum

Len

gth

[cm

]

Lamp Length [cm]

1.8

4.0

3.0

= 1.5cm

= 1cm

ConfidentialEEFL Electrode StructureEEFL Electrode Structure Electrode Formation Methods

1) Metal Cap ( Copper Cap )2) Metal Foil Taping3) Metal Plating4) MetalGlass Melt-Bonding

Al-PasteCopper Cap Cu-Taping

Metal-Bonding Metal-Bonding

ConfidentialEEFL Electrode StructureEEFL Electrode Structure

0 1 2 3 4 5 6 70

5000

10000

15000

20000

25000

30000

35000

40000

45000 Ag melt-bondingAl melt-bondingAl-tapingCu-taping

2 4 6 8 100

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

Effic

ienc

y [l

m/w

]

Brig

htne

ss [c

d/m

2 ]

0

10

20

30

40

50

60

EEFL (Ag melt-bonding)conventional CCFL

Brig

htne

ss [

cd/m

2 ]

Bonding

Taping

Power [W]Power [W]

ConfidentialMetalMetalGlass MeltGlass MeltBonding Technology Bonding Technology

Metaltaping (Low Capacitance)

Metalglass meltbonding(High Capacitance)

(+)

Glasspolarization

metal

Wall charge

(+)

Wall charge

+

Metal-tape

Wall charge

Glasspolarization

Irregular space (high field)

Wall charge

+

ConfidentialVarious EEFLVarious EEFL--Lamps Lamps

-Color EEFL Lamps

ConfidentialVarious EEFLVarious EEFL--Lamps Lamps

ConfidentialVarious EEFLVarious EEFL--Lamps Lamps

450 mm

393 mm

355 mm

314 mm

291 mm

1000 mm

ConfidentialEEFLEEFLEdge Lighting Backlight Edge Lighting Backlight 2) Bended Electrode1) Elongated Bottom Electrode

Dead Zone(~0.8cm)

Lamp

ReflectorLGP

Lamp

ReflectorLGP

ConfidentialEEFLEEFLBacklight ( EdgeBacklight ( EdgeLighting ) Lighting )

19Panel17Panel

Reflector

Multi-Vibrator Switching InverterFull-Bridge Switching Inverter

( 15 * 3 * 1 ) (cm)( 12 * 3 * 1 ) (cm)

ConfidentialEEFLEEFLDirect Lighting Backlight Direct Lighting Backlight

Type1 : Electrodeless Lamps Type2 : Elongated EEFLs Type3:Bended EEFLs

- Simple Connection- Low Efficiency ~50 lm/W

- Narrow Dead Zone- High Efficiency ~ 60 lm/W

- Narrow Dead Zone- High Efficiency ~ 60 lm/W

Electrodeless Lamp ElongatedLampHole

LampHole

LampHole

Lamp Connector(Copper Inside hole)

Lamp Connector(Copper Inside Hole)

Lamp Connector(Conductive Lubber Inside Hole)

ConfidentialEEFLEEFLBacklight ( DirectBacklight ( DirectLighting ) Lighting )

20.1 Panel Diffusion Plate Opened

( 12 * 3 * 1 ) (cm)( 9.5 * 4.8 * 1 ) (cm)

ConfidentialEEFLEEFLBacklight ( DirectBacklight ( DirectLighting ) Lighting )

Full bridge Switching Inverter

12 - EEFLsi) Voltage (2kV/Div.)

ii) Current (100mA/Div.)

iii) Optical Signal

( 12 * 3 * 1 ) (cm)

Multi-Vibrator Switching Inverter

12 - EEFLs

i) Voltage (2kV/Div.)

ii) Current (40mA/Div.)

iii) Optical Signal

( 15 * 3 * 1 ) (cm)

ConfidentialEEFLEEFL--Backlight ( Direct Backlight ( Direct Lighting ) Lighting )

Cu-Taping Electrode

40 45 50 55 60 65 70

50

52

54

56

58

60

62

64

Brightness

Efficiency

Brightness [ cd/ m

2]

20 Inch panel

Effi

cien

cy [

lm/W

]6500

7000

7500

8000

40 45 50 55 60 65 7045

48

51

54

57

60

63

Effi

cien

cy [l

m/W

]

Efficiency

5000

6000

7000

8000

9000

10000

11000

1200017 Inch panel

Brightness

Brightness [ cd/ m

2]

Frequency [kHz] Frequency [kHz]

ConfidentialEEFLEEFL--Backlight ( Direct Backlight ( Direct Lighting ) Lighting )

20.1 Inch 20.1 Inch ((InputInput : 12: 12VV)) : Metal-Bonding Electrode

9 10 11 12 13 14

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5