PLED: THE OLED
TECHNOLOGY OF THE FUTURE
THE TERM "OLED" COMPRISES ALL ORGANIC DISPLAY TECHNOLOGIES. PLED TECHNOLOGY IS
BASED ON ORGANIC LIGHT-EMITTING MOLECULES AND WAS FIRST DEVELOPED BY CAMBRIDGE DISPLAY
TECHNOLOGY (CDT). IN PLED DISPLAYS, THERE MOLECULES ARE APPLIED IN POLYMERIZED (CHAINED)
FORM.
The manufacture of PLEDs is similar to that of OLEDs, however the procedure is much
simpler and significantly less costly. This is due to the spin coating process used, which
requires fewer production steps. As with OLEDs, final encapsulation represents the
decisive quality characteristic, as it directly determines the display operating life.
Currently, this quality characteristic is roughly equal for PLEDs and typical OLEDs.
However, due to the "simplified" manufacturing technology required for PLEDs, a
significantly longer operating life can be expected for these products in the near future.
Based on expert forecasts and the latest research results, the PLED market promises to
grow significantly including exponentially larger production volumes over the next several
years.
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The displays are made using PLED
molecules sandwiched between two glass carriers that have been coated to form electrodes.
The negative electrode (cathode) injects electrons into the polymerized film, while the
positive electrode (anode) injects holes. When the electrons and holes "capture"
each other, photons are emitted and generate light.
THE ADVANTAGES OF PLEDs CAN BE
SUMMARIZED AS FOLLOWS:
* simpler and cheaper to manufacture
* lower overall height, as no backlight is required
* low current consumption
* low weight
* extremely wide viewing angle
* good readability in sunlight
* fast frame rates
* wide operating temperature range
The design potential is unlimited and extends from monochrome to full-color RGB PLED
displays. There are already several typical standard sizes available, offering practically
a 1:1 replacement for their respective LCD counterpart.
Harald Gruen, EXT 58
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