If you’re shopping for a big screen TV, there’s advice all
over the place on which to get. My blog is no exception! This is coming purely
from a home theater point of view. If you don’t care about colors, viewing
angles, or size (say, if you plan to use it to watch Bloomberg Television), my
conclusions might not be what you’re looking for. However, if you want to watch
Lord of the Rings and have your eyeballs melt… then read on!

What are LCD and
Plasma Screens?

An LCD screen is made up of liquid crystal pixels pushed
between glass plates. Current goes through the pixels, and a controlled picture
is created. This is how a digital wristwatch works, basically, only with more
colors and smaller pixels. It’s important to note that the pixels are backlit-
they don’t light up on their own.

A plasma screen, on the other hand, uses millions of little
cells filled with neon and xenon gas. When electricity zaps these cells, the
gas turns into a plasma (hence the name). Each cell is coated in phosphors
(red, green or blue), which fluoresces when the plasma gets charged. Think of a
plasma screen as a sheet with millions of tiny, tiny fluorescent light bulbs,
because that’s basically what it is.

Plasma: None More
Black

One big difference a lot of people find between LCD and plasma
is the deepness of blacks. Plasma screens get a deep, true black, because it’s
made up of tiny lights. Turn the lights off, and you get the absence of light,
which is as black as it gets! LCD screens have a constant backlight, however;
LCD blackness is thus achieved by setting the pixel to block as much light as
possible. There’s always a little leakage, though, so you never get true black,
especially at certain angles.

This viewing angle is another big issue with LCD screens. If
you’re looking at it from the wrong angle, the colors distort and the black
gets even lighter. This has to do with the polarity-shifting mechanism of LCD
technology. I’m told they’re getting better at this, but it’s still annoying,
in my opinion. My new laptop is LCD, and while it’s bright and crisp, the top
and bottom of the screen are usually a little discolored compared to the
middle, because I’m viewing the top and bottom at the wrong angle. I can turn
the screen to fix this, but then the middle’s at the wrong angle.

Plasma TVs are also usually bigger. Most LCDs top out at
about 50″, barring a couple new (and costly) 70-inch models, whereas
larger plasmas are easy to find.

 LCD: More Pixels,
Less Juice

Why would anyone go with LCD TVs? Well, for one thing,
they’re cheaper than similarly-sized plasma models most of the time, and
they’re getting even cheaper by the day. LCDs also usually have a much higher
resolution. More pixels can be better!

There’s also the issue of burn-in. The phosphors used in
plasma screens wear out over time (a long time- 30k to 60k hours). Ever seen an
old arcade machine, where the title screen was still visible even when the
picture changed? Same deal. It’s usually not that bad these days, of course,
since most pictures move around more than a Galaga high-score list, but any
plasma screen’s days are numbered. LCD screens die, too, but usually much later
on in their lives, and there’s no risk of ugly, mucky burn-in.

If you care about power consumption, and you should, it’s
worth noting that LCD uses far less power (as much as 30 percent less than
plasma). That adds up to a lot of clams.

So, which one should
I get?

If you’re talking about a TV screen, and not a computer
monitor, I’d suggest plasma. The viewing angle issue alone should seal the deal
to anyone who plans to put the TV in a family’s living room, and the lack of
true black is, in my experience, not very cool.

LCDs tend to be lighter and cheaper, though, and are fine
for a lot of smaller applications like computers. Cheaper does go a long way,
too; that’s extra money to spend on speakers, DVDs, or  a whole lotta beer. Not to mention the lower
power draw, which (in this age of utility bills gone mad) is a gift that keeps
on giving!