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Networks |
Computer Monitors--CRT
Monitors and LCD Monitors
CRT Monitors
CRT stands for
Cathode Ray Tube. It describes the technology inside that
chunky monitor you might have on your desk. CRTs receive
their picture through an analogue cable and that signal is
decoded by a display controller. The controller
handles the internal components of the monitor. |
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CRTs have a distinctive funnel
shape. At the very back of a monitor is an electron gun. The
electron gun fires electrons towards the front through a
vacuum which exists in the tube of the monitor. The gun can
also be referred to as a cathode - hence the electrons fired
forward are called Cathode Rays. These rays correspond to to
the red, green and blue channels of the display and video
card. |
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At the neck of the
funnel-shaped monitor is an anode, which is magnetized
according to instructions from the display controller. As
electrons pass the anode, they are shunted or pulled in one
direction or the other depending on how magnetic the anode
is at that time. This moves the electrons towards the
correct part of the screen.
Flat panel monitors are a
relatively recent product to enter the computer market. The
clue to LCD technology is in the name - crystals that are in
liquid form. Because they are in a liquid form they are
easily manipulated. This allows the light to be manipulated
as it interacts with them. If you have a flat panel in front
of you, try just pressing gently on the surface - you can
see the crystals move around and alter the picture.
LCD panels are fairly simple to understand. The signal comes
in and, as with a CRT, the signal from the video controller
is decoded and understood by a display controller on the
monitor itself. The controller has two things to control -
the electrics of the pixels and the light source.
The actual image on a TFT is made up of a matrix of pixels.
Unlike with CRTs, there's no complex equation of dot pitch
and image area to try and calculate - the native resolution
of the monitor is simply the number of pixels contained in
the matrix. If it's a 17" monitor, chances are there are
1280 pixels in the matrix horizontally, and 1024 vertically.
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___________
Great Selection of Affordable LCD Monitors
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Look at the LCD Monitors
here and make your choice. |
