By Gary Merson
Edited by Michael Fremer
Whether the day after Thanksgiving is called “Black Friday”because of the day’s heavy traffic or because it signals the beginning of the selling period when most retailers go from being in the red to being Ã¢â‚¬Å“in the black,Ã¢â‚¬Â it unofficially marks the start of the holiday gift giving buying season.
Despite the ongoing recession and high unemployment, analysts at both iSuppli and the Consumer Electronics Association predict that 8 million LCD HDTVs will sell during the fourth quarter, up 7.3% from the same period in 2008. Clearly, HDTVs are among the most prized gifts. So whether you’re right or wrong here’s our advice.
Job one is to pick the right screen size for your needs. HD LCDs range from 19Ã¢â‚¬Â to 65Ã¢â‚¬Â and plasmas from 42Ã¢â‚¬Â to 65Ã¢â‚¬Â.Ã‚Â LCD screens 37Ã¢â‚¬Â and smaller generally feature 720p resolution, though there are a few sets as small as 32Ã¢â‚¬Â offering 1080p. There are 42Ã¢â‚¬Â and 50Ã¢â‚¬Â 720p plasma sets as well, with all plasma sizes available in 1080p.
Which size is right for you? Consider your budget, room size, seating positions and finally if itÃ¢â‚¬â„¢s an issue for you, the size of the cabinet in which youÃ¢â‚¬â„¢re placing the set. Our exclusive HD Guru viewing distance chart (link) tells you how close you need to sit to see full resolution with a given 720p or 1080p display. Sit further away and of course you will still get a great picture, butÃ‚Â human vision limitations will prevent you from seeing the setÃ¢â‚¬â„¢s full resolution.
LCD or Plasma?
LCD is your only choice if size or budget constraints limit you to a below 42″ size. While you have a choice of plasma or LCD at 42″ or above, HD Guru and most other experts agree that plasma beats LCD (including those labeled “LED” in overall picture quality.
Why? Plasma offers uniform picture quality as you move off-axis, meaning everyone in the room essentially sees the same picture. LCD does not. Off axis, all LCD displays exhibit changes in color, black level and brightness, though some that will be recommended in an upcoming article, offer better off-axis performance than others.
Plasma offers overall better black levels, with blacks always appearing deeper when viewed off-axis compared to LCDs, because plasma has the ability to shut light off at a pixel level. Because LCD is a backlit technology, the best it can do¬and not all LCDs have it is dim large blocks of pixels using a feature called “local dimming”. It’s not nearly as precise or effective as actually turning off individual pixels and adjacent high contrast images often produce a halo artifact.
CCFL Or LED Backlit LCD TV?
A relatively recent advance in LCD technology uses LEDs (light emitting diodes) to illuminate the picture in place of the more commonly used thin fluorescent tubes called CCFLs. Though some set manufacturers choose to call their LED backlit sets Ãll told they are still LCD TVs However, LED backlighting has a number of advantages, one of which is lower power consumption compared to both traditional backlit LCDs and plasma. For a given screen size, plasma and CCFL backlit LCDs have about the same energy efficiency.
Another LED advantage is the production of very bright images, which makes them preferable to both CCFL backlit LCDs and plasma if you do a lot of daytime viewing, especially in windowed rooms that lack shades or curtains.
Edge Versus Backlit LED
Manufacturers use LEDs to either edge light or back light their LCD sets. Edge lighting can produce thin profile sets that are just over an inch deep. Back lit sets are deeper but, offer the aforementioned advantage of local dimming, which can produce extremely dark black levels.
Edge lit LEDs have white and black uniformity issues at the picture perimeter while off-axis brightness of both LED formats tends to fall off somewhat more rapidly than does the same panel lit using traditional CCFLs. However, overall, LED backlit sets produce the best LCD pictures.
Standard LCDs incorporate a 60 Hz refresh rate. This produces motion resolution of around 320 lines (per picture height) out of a possible1080 lines. 120 Hz refresh ups the motion resolution to around 600 lines, while 240 Hz kicks it up to 900 lines or higher.
Some sets incorporate circuits that produce even more frames per second in an attempt to further smooth motion, but the added smoothness comes at a price, which is an increase in picture artifacts (see related story here link).
For the best LCD picture, either traditional or LED backlit, choose one with either a 120Hz or 240Hz refresh rate. However, all 1080p plasma sets produce artifact free, full 1080 line motion resolution. PanasonicÃ¢â‚¬â„¢s V and Z series plasmas offer a 96Hz refresh rate that produces images free of the judder found in all 60 HzÃ‚Â panels (plasma and LCD) without the artifacts associated with 120/240Hz LED/LCDs.
If youÃ¢â‚¬â„¢re looking for the most accurate image reproduction, consider THX Certified designs that provide near ideal out of the box color temperature and color point accuracy when set to the THX picture option. User calibration controls included with many top of the line HDTVs allow (with proper test equipment and signals) near perfection image fine tuning.
Buying your HDTV
This yearÃ¢â‚¬â„¢s holiday supply of HDTVs is good with prices about 20% lower than last year.
Market conditions changed with Circuit City’s demise, essentially leveling Best Buy’s Black Friday “Door Buster” prices on mid to high end models with those found at Pricegrabber and Amazon. For tips on buying a set at a brick and mortar store, check out our feature “How To Negotiate the Best Deal”. (link).
Have a question for the HD Guru?
Copyright ©2009 HD Guru Inc. All rights reserved.HDGURU is a registered trademark. The content and photos within may not be distributed electronically or copied mechanically without specific written permission. The content within is based upon information provided to the editor, which is believed to be reliable. Data within is subject to change. HD GURU is not responsible for errors or omissions.