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HDTVs
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Home Theater
February 1, 2010 • Vol.7 Issue 2
Page(s) 15 in print issue

HDTVs
Screen Technology Differences
LCD (liquid-crystal display)

LCDs can use one of two backlight technologies. CCFLs (cold cathode fluorescent lamps) are the most common, but LEDs are the latest backlight technology to hit the LCD scene. (See the “LED” section for more info on LED TVs.)

Pros
The thin profiles and light weight of LCDs make them easy to mount on a wall.

Power demands are a bit lower than comparably sized plasma displays and considerably lower than CRT televisions.

Cons
Fast-moving images may suffer from a slight trailer effect, but with improved LCD technology, the effect is barely perceptible.

When pixels stick on or off, they show up as either a pinpoint of bright light or black, which can be distracting on-screen.

From certain viewing angles, LCDs will lose video contrast and color.

LCDs with CCFL backlighting suffer from leaking light, and unlike LEDs, they can’t dim certain areas on-screen. This may result in blacks and whites that appear to be more gray in color.

Best For
Streaming PC content

Bright, sunny rooms


LED (light-emitting diode)

LED TVs are actually a type of LCD TV. These sets use one of two LED backlight technologies:

Full-array lighting places LEDs behind the screen in a grid pattern, letting the TV dim certain LEDs for the best contrast ratios available.

Edge-lit sets have LEDs placed around the frame of the TV, and light is directed toward the center of the screen. Edge-lit models cost less than full-array sets and are a lot thinner.

Pros
By using LEDs, these sets use a lot less electricity than other HDTVs, and they don't contain harmful mercury.

Overall, LED TVs are one-third thinner than other LCD TVs and have longer life spans.

Plasmas are well-known for their deep blacks and crisp whites and fast response times, but LED TVs closely match in performance.

Cons
These sets are costly because they feature a relatively new technology.

Blooming, or a halo effect, may encircle bright images that are on dark backgrounds.

Best For
Eco-conscious viewers

Fast-paced gaming


Plasma

Pros
A plasma TV’s phosphors light up evenly across the screen to create images, which are consistently bright and clear with vibrant colors.

The contrast ratio is high, so you’ll see some of the darkest blacks and brightest whites.

The design and technology of plasma TVs lend themselves to large screen sizes—typically 50 inches or greater.

Rapid pixel response means no blurry motion.

Wide viewing angles give you the same high-quality images on-screen no matter where in the room you happen to be sitting.

Cons
Some plasmas are susceptible to image burn-in if not cared for properly.

Low air pressure and high altitudes may cause plasmas to buzz.

Some plasmas have highly reflective glass, which isn’t ideal in sunny settings.

Best For
Large groups who watch TV together

Movies or sports with nonstop action


RPTV (rear-projection TV)

Pros
• RPTVs are surprisingly lightweight for their sizes.

• You’ll find exceptional picture quality on very big screens (65 inches and larger).

• As screens get bigger, RPTVs tend to be more cost-effective than an LCD, LED, or plasma TV.

Cons
• With depths of 16 to 24 inches, these TVs are far too big and bulky to mount on a wall.

• RPTVs require lamp replacements every few years.

Best For
• Anyone who wants to bring a cinematic experience home

• Big, roomy home theaters



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