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Difference between Organic LED and Inorganic LED | Organic LED vs Inorganic LED

This page compares Organic LED vs Inorganic LED and mentions difference between Organic LED and Inorganic LED. It mentions advantages and disadvantages of organic LED (OLED), basics and types of organic LED (OLED).

Organic LED | OLED

Introduction :
OLED stands for Organic Light Emitting Diode. OLED works on the same principle of electro-luminescence. It states that certain metals emit light in response to electric current passing through it.

In simple form, monolithic OLED consists of two thin organic layers viz. ETL and HTL are sandwiched between two thin film electrodes (Anode and Cathode). ETL stands for Electron Transport Layer and HTL stands for Hole Transport Layer. Anode is made by ITO coating where as cathode is made by thin coating MgAg. Organic materials such as Tris, aluminium with glass transition temperature (about 174oC) is preferred as ETL material. TPD and α-NPD are preferred as HTL materials.

OLED Structure, How OLED Works

As shown in the figure-1, OLED structure consists of Cathode, Emissive Layer, Conductive Layer, Anode and substrate. Refer tutorial on OLED basics and types >> for more information.

Advantages of Organic LED (OLED)

Following are the benefits or advantages of Organic LED (OLED) over inorganic components:
➨Thinner (< 300 nm) , lighter and more flexible
➨Lower in cost
➨Brighter and clearer picture
➨Consume much less power i.e. power consumption is less.
➨Easier to produce and make into larger sizes
➨Large field of view i.e. viewing angle.
➨It can be printed on various surfaces.
➨High luminous power efficiency
➨Fast response time (suitable for animation and entertainment)
➨Being polymeric in nature, it can be grown on flexible surface for flexible display systems.
➨Color tuning flexibility for full color display systems etc.

Disadvantages of Organic LED (OLED)

Following are the drawbacks or disadvantages of Organic LED (OLED):
➨Their lifetime is shorter compare to other display types. White,Red and Green OLED offer lifetime of about 5 to 25 years where as blue OLED offers about 1.6 years.
➨It is expensive compare to LCD.
➨It is susceptible to water and hence it can be easily damaged by water.
➨OLED screens are even worse compare to LCD when subjected to direct sunlight.
➨Overall luminance degradation.
➨Limited market availability.

Difference between Organic LED and Inorganic LED

Following table mentions basic difference between Organic LED and Inorganic LED.

Features Organic LED Inorganic LED
Operating voltage 2 to 20 V < 10 V
Efficiency ~ 0.5 ~ 0.1
Response time ~ 1 µs ~ 1 µs
Display screen size 2 to 20 inch flexible size
color contrast Moderate Good
View Angle Excellent Good

Organic LED related links

OLED basics and OLED types
Advantages of OLED display
OLED vs LED vs LCD
Advantages and disadvantages of OLED
Difference between QLED and OLED

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