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Basic Computer Parts
"Computer Parts Explained - About Monitors"
presented by The PC Doctor of
Chilliwack, British Columbia.
As I mentioned in an earlier column, a monitor is the device that you watch,
very much akin to your TV set, the only real difference is your monitor does not
have a tuner.
There are three different types of monitors, they are Cathode Ray Tube (CRT),
Liquid Crystal Display (LCD) and Plasma (Plasma). They all do the same thing, that
is display the information that your computer is processing at the time,
whether that is writing a letter or playing a game.
All three devices are very similar but
with all things time and technology marches on. Only 10 years ago the average computer
user was using a 14" or 15" CRT. Over the past ten years there have been massive jumps
in technology, which translates to bigger and better for you and me. The only drawback
to that is usually the cost but over time this drops as well.
I hear you asking,
"That's all very fine and good, but what are the differences. To ME?"
Good question, I will try to answer that question and many others without going
into too much technical mumbo jumbo. I hope the below table helps.
||14" - 21"
||14" - up
||13" - up
||$25 USED & UP
||$500 & UP
||$1000 & UP
These points are really just a starting point, the meat and potatoes are as follows:
CRT monitors use more energy and emit more low-frequency
Actual Screen Size
When you measure a CRT monitor for screen size, you start UNDER the bezel, whereas LCD's
and Plasma monitors start at the edge of viewable area. So when you buy a 15" LCD you are
getting almost the same screen area as a 17" CRT monitor!
Question: How do they work?
I know many of you lay awake at night wondering about this very thing, well worry no more.
CRT monitors - Simply put, the back side of the glass screen is coated with
phosphor. An electronic beam is fired from the beam gun at the back of the monitor.
As that beam strikes the phosphor it glows.
LCD monitors - There is two sheets of glass in the front, between these
sheets is a liquid crystal solution. Behind the sheets is a bulb, when a current
is passed through the liquid crystal solution, it opens and closes like a tiny shutter.
PLASMA monitors - The plasma screen also has two sheets of glass but
sandwiched between these sheets is a thin layer of phosphor pixels. When a high
frequency UV ray strikes them they glow.
Question: Which is better?
Answer: Well the plasma has a faster refresh rate, which means it redraws the
screen faster than the others. It also sports a wider viewing angle, so you can see
it better on an angle than you could if you where using a CRT.
Question: How long will it last?
Answer: Well you don't really know. Both LCD's and Plasma's are expected to last
about 6 or 7 years if left on for 24 hours a day. CRT's don't really have a life
expectancy, I have used many monitors that are over 5 years old. If you are a
normal user, you would probably have few problems with any of the units. As time
goes by and the cost of manufacturing drops, you will see LCD's and Plasma's drop
in price and become far more common. Right (Feb 2004) now you can expect to pay $150-$200 (Cdn)
for a 17" CRT brand new, $400 - $500 (Cdn) for a 14"LCD and over a $1000 (Cdn)for 13" Plasma.
It wasn't all that long ago that a 14" CRT cost $400 (Cdn), time flys.
Question: Isn't it a Flat Screen?
Answer: I hear this a lot. People hear the term FLAT SCREEN and assume that it means an
LCD or PLASMA. It doesn't. What it means quite simply is the monitor screen is
FLAT. All LCD's and Plasma screens are flat but not all CRT screens are, if they
are, it will help with the amount of glare you will see, but the case will not
be ANY smaller.
All I can say is I own a 14" LCD and have used it for 4 years, I would not go back to
a CRT monitor. Yes, it is more money but if you spend a lot of time in front of the
screen, its worth it. If you are thinking of upgrading to an LCD or Plasma monitor,
go to the store and actually view one working, it will be worth your time and trouble.
If you have any questions about this topic, please feel free to email me.
firstname.lastname@example.org and I will try to answer you
as best I can over email.
(The) PC DOCTOR
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