You have certainly heard about Digital TV and HDTV. You may even belong to the group of people who decided to buy one for themselves, but all of the information surrounding it confuses you. Much information is rather technical and there are many things hard to understand about HDTVs for average people. So, if you do not belong to the few people who are familiar with the topic, take a look around the internet & look up terms that you aren't familiar with.
1080p means that the resolution of the picture is 1,920 vertical pixels by 1,080 horizontal pixels and 'p' stands for progressive scanning. This format works on the same principle as 720p; the only difference is that in this type there are more pixels and the resolution is better. Progressive scanning offers a smoother picture, as 1080 horizontal lines are scanned progressively or in succession in a vertical frame that is repeated 30 times a second.
There are a few obvious factors to being able to detect resolution differences: the resolution of the screen, the size of the screen, and the viewing distance. To be able to detect differences between resolutions, the screen must be large enough and you must sit close enough. So the question becomes "How do I know if need a higher resolution or not?" Here is your answer.
Based on the resolving ability of the human eye (with 20/20 vision it is possible to resolve 1/60th of a degree of an arc), it is possible to estimate when the differences between resolutions will become apparent.
So, for example, let's take a 50-inch screen, the benefits of 720p vs. 480p start to become apparent at viewing distances closer than 14.6 feet and become fully apparent at 9.8 feet. For the same screen size, the benefits of 1080p vs. 720p start to become apparent when closer than 9.8 feet, and become full apparent at 6.5 feet. In my opinion, 6.5 feet is closer than most people will sit to their 50" plasma TV (even through the THX recommended viewing distance for a 50" screen is 5.6 ft). So, most consumers will not be able to see the full benefit of their 1080p TV.
However, front projectors and rear projection displays are a different story. They make it very easy to obtain large screen sizes. Plus, LCD and Plasma displays are constantly getting larger and less expensive. Let's look at a 123-inch screen and a projector with a 1280720 resolution. For a 123-inch screen, the benefits of 720p vs. 480p starts to become apparent at viewing distances closer than 36 feet (14 feet behind the back wall) and become fully apparent at 24 feet (2 feet behind the back wall). For the same screen size, the benefits of 1080p vs. 720p start to become apparent when closer than 24 feet and become fully apparent at 16 feet. This means that people further back in the room would have a much better viewing experience if I purchased a 1080p projector and that people in the front row would notice a drastic improvement.
Dennis Ogilvie is the founder of 1staudiovisual UK. He can be reached for more information at his website here: http://www.1staudiovisual.co.uk
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