Introduction
Plasma Displays are very large and thin, with high contrast ratios, smooth images and superb colour reproduction. The difference between conventional CRT Televisions and modern Plasma Screens is huge, and with a HD Ready Display, you can watch films in Movie Theatre quality. You can also view television broadcasts in High Definition, and Next Generation Gaming in glorious colour.
LCD Technology is advancing rapidly, and as a result, LCD Televisions are now a viable alternative to Plasma Displays. They have a longer life span and use less power than Plasma and CRTs, and can double as Computer Monitors with their ability to display very sharp images. Like Plasma TVs, LCDs are also very thin, and recent improvements have given them better viewing angles of up to 170 degrees, making them perfect for family viewing and playing games. With the introduction of HD Ready models, the future of home entertainment is brighter than ever before.

Head to Head Comparisons
Size and Resolution
Plasma – Most Common Sizes: 42” – 50”
LCD – Most Common Sizes 26” – 32”
The larger average size of Plasma TVs means that you get a bigger screen for your money, however, LCDs often have a higher resolution, which means that more individual dots of colour (pixels) occupy a smaller space. If you intend to watch the TV from a closer distance than average, or the TV is relatively large compared to its environment, then LCD would be the best bet. If you intend to watch the TV from further back, or the TV is relatively small compared to its environment, then Plasma is the ideal choice.

Brightness and Contrast
Plasma – Typical Brightness Levels (cd/m2): 1,000 – 1,300
LCD – Typical Brightness Levels (cd/m2): 500 – 600 Plasma – Typical Contrast Ratios: 3,000:1 – 10,000:1
LCD – Typical Contrast Ratios: 500:1 – 3,000:1
Taking into consideration the fact that a typical movie theatre will project a contrast ratio of about 500:1, the exceptional levels produced by Plasma TVs is a result of their ability to show very dark blacks, with no light leakage even in a totally dark room. Plasma TVs generally have a more “glassy” screen than LCDs, which gives them their higher brightness levels, but this is misleading as to the human eye, they don’t appear any brighter when placed side by side with LCDs. In high brightness environments, especially where there may be sunlight in a room, LCDs are better, because they won’t reflect as much light and background objects as a Plasma might do.

Life Expectancy
Plasma – Average Life Expectancy: up to 60,000 hours
LCD – Average Life Expectancy: 60,000+ hours
Until recently, Plasma TVs had a much lower life expectancy than LCDs. However, they have now virtually caught up, and as such, life expectancy is no longer a stumbling point for Plasma TVs. If the TV was on for 5 hours a day, it would take 27 years to reach the 60,000 hour mark, and many would keep going strong for years after that. But, life expectancy is measured differently for the two types, because of the way in which they deteriorate over time. An LCD display will work as good as new until the day it dies, whereas a Plasma TVs brightness will fade over time. The life expectancy of a Plasma TV is the time that it takes to reach 50% of the brightness it started with, so in theory it will still keep going after that.
Plasma – Average Life Expectancy: up to 60,000 hours
LCD – Average Life Expectancy: 60,000+ hours
Until recently, Plasma TVs had a much lower life expectancy than LCDs. However, they have now virtually caught up, and as such, life expectancy is no longer a stumbling point for Plasma TVs. If the TV was on for 5 hours a day, it would take 27 years to reach the 60,000 hour mark, and many would keep going strong for years after that. But, life expectancy is measured differently for the two types, because of the way in which they deteriorate over time. An LCD display will work as good as new until the day it dies, whereas a Plasma TVs brightness will fade over time. The life expectancy of a Plasma TV is the time that it takes to reach 50% of the brightness it started with, so in theory it will still keep going after that.

Viewing Angle
Plasma – Perfect Viewing Angles
LCD – Picture can be affected when viewed from sharp angles
With LCD TVs, colour and brightness can be affected when viewed from a tight angle, sometimes noticeably, but usually only within the last few degrees until you’re viewing it side-on. Plasma TVs don’t suffer from this effect at all, and have perfect image reproduction whatever the viewing angle is.

Latency
Plasma – Not Applicable
LCD – Can show slight blurring during fast moving sequences
When an LCD pixel changes colour, it takes time, depending on how much it has to change by. In a fast moving sequence, where they have to change colour very quickly, this can cause the picture to blur, if the response time is too high. Most current LCD screens have a response time of 12ms or 8ms, which makes it difficult to spot an incidence of this effect.

Screen Burn-in
Plasma – Possible
LCD – Not Applicable
Screen Burn-in could happen when a Plasma TV displays the same still image for a long time, and leaves a ghost of that image on the part of the screen where it was. This could be temporary or permanent, and could take 15 minutes to happen, or the image could be displayed for 6 hours and leave no effect.

Colour Reproduction
Plasma – Incredibly accurate colour reproduction
LCD – Second best, but no flickering possible
Plasma TVs have a more accurate colour reproduction, although in certain circumstances the image may be subject to a bit of flickering. LCDs cant flicker because of their latency, but their blacks are not as deep as those of a Plasma.

Power Consumption
Plasma – Average Power Consumption: 250W for a 42” screen
LCD – Average Power Consumption: 150W for a 42” screen

Conclusion
Despite any drawbacks outlined here, LCD and Plasma screens are the best quality display devices you can get for their price. To put their negatives into perspective, they only surface when compared with each other head to head, and scrutinised with far more detail than an untrained eye could notice. They are two technologies that are neck and neck with many differences and no clear winner, while both are a world away from traditional CRT televisions. The decision of LCD or Plasma boils down to individual preference as both sides have done much to address their shortfalls and deliver a stunning public or home entertainment experience.

What is HDTV?
High-definition television is a new format for broadcasting TV programming. The existing analogue formats are NTSC and PAL, which have been used for decades. The new digital formats, or DTV, are replacing analogue. DTV is broken down into two subcategories, SDTV, and HDTV. SDTV is higher quality than analogue, and is the format that free digital television services will be broadcast in for the foreseeable future. HDTV is the top tier of digital television providing the best quality picture and sound.

Do I need a new television set to watch HDTV?
Yes. You must have a high-definition tuner and screen to properly decode HDTV signals and display them accurately. HD channels are also broadcast in standard format, so today, no programs are ONLY for HDTV users. A regular television set simply ignores HDTV signals that are being broadcast. When you want to step up to watching HDTV, you'll need to get a new HD Ready TV set.

What's different about HDTV versus the existing signals?
The HDTV signal is digital resulting in crystal clear, noise-free pictures and CD quality sound. For the technophile, there are about 20 megabits per second of information per broadcast channel. HDTV has many viewer benefits.

Benefit: Aspect Ratio
Most televisions manufactured before a couple of years ago are manufactured in a 4 by 3 aspect ratio, which means the screen is 4 units wide by 3 units high. But theatrically released movies are usually in a much wider aspect, taking advantage of the human field of vision (which is wider across horizontally). HDTV signals are sent in a 16 by 9 aspect ratio, mimicking the wide scope of movies. HDTV's aspect ratio makes for a more immersive and intense viewing experience.

Benefit: Picture Resolution
Resolution is a measure of picture sharpness. Current analog television contains about 480 active scanning lines resulting in a picture resolution of about 330 lines of resolution. By comparison today's VHS VCR's have about 240 lines of resolution which is why VHS recordings don't look as sharp as the original picture. DVD's offer higher resolution typically on the order of 400-480 lines of resolution. (Note the number of scanning lines does not equal resolution. For example, both the VHS and DVD formats have 480 active scanning lines but have different resolutions.) HDTV offers resolution that is at least twice that of analog television. You can expect razor sharp images from HDTV.

I have heard that there are two HDTV formats — 720p and 1080i. Is there a difference between these and can my television receive both?
Regardless of the HDTV format being broadcast, all new HDTV receivers can receive both formats. New HDTV televisions will convert any received signal to a format that is compatible with your new display. The 720p format uses progressive scanning, which is just like your computer monitor. Progressive scan offers crystal clear images that virtually eliminates those scanning lines that are visible on most large screen televisions. The 1080i format uses interlace scanning just like today's analog televisions. Scanning lines are less visible on big screens due to the number of lines. Most older projection HDTV's use 1080i.

Benefit: Digital Sound
Just as your CDs sound better than your old audiocassette tapes, HDTV's digital audio signal sounds better than standard television's analogue sound. Also, some HDTV programs include Dolby Digital 5.1 surround sound. Properly decoded, each audio track can be sent to a different speaker, creating a three-dimensional sound field in your living room. Many prime time programs contain Dolby Digital surround sound for your listening pleasure.

What do I need to receive HDTV?
In most areas, HDTV is only available as an over-the-air broadcast signal. This requires the use, in most cases, of an outdoor aerial pointed in the direction of the broadcaster's tower. You will also need a new HDTV receiver that can decode the digital signals. HDTV channels are typically different than your cable or over-the-air channel.

The High-Definition Multimedia Interface (HDMI) is a compact audio/video connector interface for transmitting uncompressed digital streams. It represents a digital alternative to consumer analog standards such as Radio Frequency (RF) coaxial cable, composite video, S-Video, SCART, component video, D-Terminal, and VGA. HDMI connects digital audio/video sources such as set-top boxes, Blu-ray Disc players, personal computers, video game consoles, and AV receivers to compatible digital audio devices, computer monitors, and digital televisions.

HDMI supports, on a single cable, any TV or PC video format including standard, enhanced, and high-definition video along with up to 8 channels of digital audio. It is independent of the various digital television standards such as ATSC and DVB as these are encapsulations of compressed MPEG video streams (which can be decoded and output as uncompressed video stream on HDMI).

HDMI products started shipping in autumn 2003. Over 800 CE and PC companies have adopted the HDMI specification (HDMI Adopters). HDMI began to appear on consumer HDTV camcorders and digital still cameras in 2006. Shipments of HDMI are expected to exceed that of Digital Visual Interface (DVI) in 2008, driven primarily by the Consumer Electronics (CE) Market.

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