Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

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Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET Oxford - Great Britain

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Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET Oxford - Great Britain. Topics. Drive Electronics Overview of OLED technology Constant current Pulse width modulation Commercial OLED drivers. Organic Light Emitting Diodes. OLED System. - PowerPoint PPT Presentation

Transcript of Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Page 1: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Organic Light Emitting DiodesElectronic Drivers

Stephen Clemmet CEng MSc BEng MIET

Oxford - Great Britain

Page 2: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Topics

Drive Electronics

1. Overview of OLED technology2. Constant current3. Pulse width modulation4. Commercial OLED drivers

Page 3: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Organic Light Emitting Diodes

Page 4: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

OLED System

OLED Driver

Channels

PWM

Current

Battery

Device

EncapsulationUV

Cathode

ETL

EmissiveUV

HTL

MaskUV

Anode

Substrate

Page 5: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

OLED Structure

Encapsulation

Power

Mask Mask

Hole Transport

Emissive

Electron Transport

Cathode

Substrate

Anode

Light

Page 6: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Drive Electronics

Pulse Width Modulator

Constant Current

OLED

Page 7: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Ohms Law

V = I x RVoltage = Current x Resistance

Page 8: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Constant Current

RDRIVER

ROLED

VDRIVER = IDRIVER x RDRIVER

VOLED = IDRIVER x ROLEDIDRIVER

VBATTERY = VDRIVER x VOLED

V = I x R

Page 9: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Pulse Width Modulation

Mark : Space

20 : 80 ≡ 20%

50 : 50 ≡ 50%

80 : 20 ≡ 80%

Page 10: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

OLED Driver Integrated Circuits

Page 11: Organic Light Emitting Diodes Electronic Drivers Stephen Clemmet CEng MSc BEng MIET

Organic Light Emitting DiodesElectronic Drivers

Stephen Clemmet CEng MSc BEng MIET

Oxford - Great Britain


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