Vacuum Fluorescent Display
A
vacuum fluorescent display
(
VFD
) is a type of
display
used on equipment such as
video cassette recorders
. Unlike
liquid crystal displays
, a VFD emits a very bright light with clear contrast. The
device
consists of a
cathode
(
filaments
),
anodes
(
phosphor
) and
grids
encased in a
glass
envelope
under a high
vacuum
condition. The cathode is made up of
fine
tungsten
wires
, coated by
alkaline
earth
metal
oxides
, which emit
electrons
. These electrons are controlled and
diffused
by the grids, which are made up of thin metal.
External link
Vacuum Fluorescent Display (VFD) (including
How to drive the filament
)
VFD-Page of Futaba (widely known manufacturer of VFDs)
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