Organic Light Emitting DiodesElectronic Drivers

Stephen Clemmet CEng MSc BEng MIET

Oxford - Great Britain

Topics

Drive Electronics

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

Organic Light Emitting Diodes

OLED System

OLED Driver

Channels

PWM

Current

Battery

Device

EncapsulationUV

Cathode

ETL

EmissiveUV

HTL

MaskUV

Anode

Substrate

OLED Structure

Encapsulation

Power

Mask Mask

Hole Transport

Emissive

Electron Transport

Cathode

Substrate

Anode

Light

Drive Electronics

Pulse Width Modulator

Constant Current

OLED

Ohms Law

V = I x RVoltage = Current x Resistance

Constant Current

RDRIVER

ROLED

VDRIVER = IDRIVER x RDRIVER

VOLED = IDRIVER x ROLEDIDRIVER

VBATTERY = VDRIVER x VOLED

V = I x R

Pulse Width Modulation

Mark : Space

20 : 80 ≡ 20%

50 : 50 ≡ 50%

80 : 20 ≡ 80%

OLED Driver Integrated Circuits

Organic Light Emitting DiodesElectronic Drivers

Stephen Clemmet CEng MSc BEng MIET

Oxford - Great Britain