A CRT is a vacuum tube used as
a display screen for a computer output device. Although the CRT means only a
tube, it usually refers to all monitors.
A CRT monitor contains millions
of tiny red, green, and blue phosphor dots that glow when struck by an electron
beam that travels across the screen to create a visible image.
Working of CRT Based Monitor
The terms anode and cathode
are used in electronics as synonyms for positive and negative terminals. For
example, you could refer to the positive terminal of a battery as the anode
and the negative terminal as the cathode.
In a cathode ray tube, the
"cathode" is a heated filament. The heated filament is in a vacuum
created inside a glass "tube." The "ray" is a stream of
electrons generated by an electron gun that naturally pour off a heated cathode
into the vacuum. Electrons are negative. The anode is positive, so it attracts
the electrons pouring off the cathode. This screen is coated with phosphor, an organic
material that glows when struck by the electron beam.
There are three ways to filter
the electron beam in order to obtain the correct image on the monitor screen:
shadow mask, aperture grill and slot mask. These technologies also impact the
sharpness of the monitor's display.
No comments:
Post a Comment