Projector HDTV

This week, we ll talk about digital and High-Definition TV, and what these technologies offer us. First, let s talk a little about how regular TV works. Traditional TVs display an image on your screen by painting the picture one line at a time until all 480 lines are on the screen. These 480 lines are drawn in an alternating fashion, know as interlacing. This means that all the odd numbered lines are drawn so that exactly half the picture on the TV is displayed, then the even numbered lines are drawn in, giving you the whole picture. After one image is completely drawn, the whole process starts again. This happens 60 times per second, giving us the illusion

of motion. Interlacing allows our eyes to see the image as a whole otherwise we might actually see the TV image being drawn top to bottom. Since standard TV only shows us 480 lines drawn on the screen, the larger the TV screen the less crisp the picture. To see what I mean, the next time you are at an electronics store compare the same show on a 19″ TV and a 36″. See those lines that are visible in the 36″ screen? Those are the TV scan lines, 480 in total. All standard analog TVs have the same resolution, regardless of screen size. Also, standard TV has an aspect ratio of 4:3, meaning that for every one inch of width the screen is three inches high, making a TV screen almost square.

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First of all, don t assume you need a huge video screen in your media room. If your screen is too large, visual fatigue will detract from your theater experience. A good, but general rule for screen size is to select a screen width that is half to one third the distance from the screen to the primary viewing location. You should keep the viewing cone, formed by a line going from your eyes to each side of the screen, to about thirty degrees.

You can use any display device and there advantages and disadvantages to each type. DLP units tend to have better black levels than LCD units. LCOS units and variations have the tightest pixel structure.

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Setting up your own home theatre is a great way to add value to your home and it can be a refreshing thing to do after you spend lot of time in your work. A home movie theatre is very easy to build once you know some basic concepts behind the whole thing.

Setting up a home theatre is nothing but creating the kind of environment you experience in a real movie theater in a smaller scale or at least in a scale that your space will allow. This is done using two aspects of the whole process.

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