| What
is OLED？ |
| OLED
(Organic Light-Emitting Diode) is a self light-emitting
technology composed of a thin, multi-layered organic
film placed between an anode and cathode. In contrast
to LCD technology, OLED does not require a backlight.
OLED possesses high application potential for virtually
all types of displays and is regarded as the ultimate
technology for the next generation of flat-panel
displays. |
| |
| The
use of OLED technology offers the following advantages
for flat-panel displays： |
| 1.
A simplified manufacturing process compared to TFT-LCD
(See comparison of Picture 1 and Picture 2 below)
|
| 2.
Self-emitting light, in contrast to the required
backlight for TFT-LCD |
| 3.
High luminosity |
| 4.
Lightweight and thin (less than 2 mm) |
| 5.
Capable of wide viewing angles（~180。） |
|
6. Low operating voltage and power consumption |
| 7.
Quick response (~ μ second level) |
| 8.
Wide range of operating temperatures (-40℃ to 85℃) |
|
|
| A
Comparison of OLED and TFT-LCD Display Technologies |
|
|
| Picture
2: TFT-LCD Display |
|
|
|
|
|
How Does OLED Emit Light？ |
| OLED’s
basic structure consists of organic materials
positioned between the cathode and the anode,
which is composed of electric conductive
transparent Indium Tin Oxide (ITO). The
organic materials compose a multi-layered
thin film, which includes the Hole Transporting
Layer (HTL), Emission Layer (EML) and the
Electron Transporting Layer (ETL). By applying
the appropriate electric voltage, holes
and electrons are injected into the EML
from the anode and the cathode, respectively.
The holes and electrons combine inside the
EML to form excitons, after which electroluminescence
occurs. The transfer material, emission
layer material and choice of electrode are
the key factors that determine the quality
of OLED components. |
|
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