Electroluminescent panel is most
used as backlight for
LCDs in
watches,
PDAs and other
devices where a
thin lightsource
is needed. The
optimum voltage is
between 100V and 150V
AC
at a frequency of 60Hz to 1Khz. This is
created by using a stepup
transformer.
The EL
panel is built up like this:
__________________ electrode
================== plastic layer
****************** Phosphor layer
------------------ transparent electrode
================== Plastic or glass substrate
The
electrode is
transparent like the ones in
LCDs.
After all the
layers are
stacked the
whole thing
might be
sealed in
plastic to
protect it, though is not done to all
panels since this increases the
thicknes of it.
When the
AC power supply is
connected to the electrodes, the
energy exites the
phosphor atoms and they in turn starts to
emit
light. The
plastic layer between the
phosphor and one
of the
electrodes prevents arching. This
technology
is also used in the
electroluminescent display and the
Active Matrix ElectroLuminescent Display.