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Collection of Education
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COMPUSCI
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1992-06-19
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49 lines
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When the monitor is turned on power
flows into the power supply. This
converts the house current into
several voltages. Some of this
power goes to the electron gun at
the back of the picture tube. The
gun is always ready to fire a
stream of electrons at the front of
the picture tube. The inside of the
glass at the front is coated with a
chemical that will glow if it is
hit by electrons. This coating is
similar to the coating inside a
fluorescent light.
To make the electrons hit the
screen hard and light it up, the
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screen is given a strong positive
voltage by a transformer called the
flyback.
There is a wire between the
circuit board and the electron gun
that can turn it on and off quickly.
Around the back of the picture
tube are some coils of wire called
the yoke. When electricity flows
through the yoke, a magnetic field
is created which controls the
electron beam.
Without the yoke, the
electron beam would always hit the
center of the screen. All you would
ever see is a small white dot.
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