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The vacuum tube that hundred
years ago only had a role in scientists' exploration
of the processes in matter, has, thanks to many
technical inventions, evolved into an apparatus that
is found in virtually every home and office –
the television tube and the computer screen.
They work similarly to
Thomson's discharge tube - an electron beam is
accelerated and deflected and hits the end of the
glass tube, giving rise to a visible spot. By
deflecting the electron beam very quickly and
modulating it to produce weaker or brighter spots, a
complete image can be constructed with an electron
beam. By making it hit small spots on the glass that
emit either red, green and blue light, complete color
images can be produced. In most television sets and
computer monitors there is a modern electric
discharge tube consisting of an electron accelerator
in an evacuated glass tube.
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