How to Choose the Right HDTV Television

High-definition television: Why bother? Surely HDTV is a plaything for the rich and self-indulgent, some cryptic form of digital television designed for Freemasons, just one more ridiculously overhyped and overpriced technology aimed at parting care-worn folk from their hard-earned cash. Right?



Wrong. The analog television standard we've been using since just after World War II is ludicrously obsolete. It was designed for round-cornered five-inch pictures that were mere portholes compared to the big screens that today's home theater buffs demand. Trying to build a home theater system around 1948-vintage technology is like riding a horse in the slow lane.



Analog TV is dying. Get over it.



Now that HDTV has been around for a few years it is possible to buy a set with full high-definition capability at a surprisingly reasonable price—less than $1000 for a direct-view set, and a little more than $1000 for a rear-projection TV—though of course the fashionable flat-panel displays cost more. You can get HDTV signals via antenna, cable, or satellite.



But what kind of HDTV is right for you? Wander into a chain store and you'll see TV sets grouped into a handful of categories. They include direct-view analog TV, rear projection, front projection, and the oh-so-desirable flat panels. Let's look into each one and see how it relates to the HDTV standard.



For Starters



For that purpose we'll need to briefly define HDTV. It embraces two formats: one with 1080 by 1920 pixels, and one with 720 by 1280 pixels. Any kind of digital TV can convert signals to its own native resolution—but to see true HDTV you must feed a HD signal into a HD-capable display.



How big of a HDTV do you need? As a very loose rule of thumb, minimum viewing distance should be three times the height of a widescreen set (HDTV is a widescreen medium) or roughly 1.5 times the diagonal measurements that manufacturers and retailers use. To put that another way, the screen diagonal should be at least two-thirds of the viewing distance.



If you don't intend to change the viewing distance in your room, screen size is the variable you need to look at. Whatever you buy should look right at your preferred distance. The screen should be large enough to dominate your field of vision and immerse you in a story or event—but not large enough for pixels or scan lines to be visible.



Direct-View HDTVs



The smallest and least expensive TVs are called direct view. In other words, they have a single picture tube. Direct-view HDTVs range in size from 27 to 36 inches. Since tube TVs define the low end of the market, many of those you'll see on display are analog—you can't assume that every TV on the shelves is a HDTV.



Direct-view HDTVs may be either widescreen or non-widescreen. Widescreen sets have an aspect ratio (screen proportions) of 16:9, or 1.78:1, the same as widescreen DVD, and similar to what you'd see in a movie theater. Other sets have the more traditional 4:3, or 1.33:1.




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Widescreen sets are better for viewing contemporary movies and the increasing number of widescreen sports telecasts. Nonwidescreen sets excel at older movies and sports on analog TV channels. Either kind can display both wide and non-wide programming with the addition of blank horizontal or vertical bars.



A more severe limitation of the direct-view TV, HD-wise, is that the shadow mask at the front of the tube doesn't have enough perforations to display any HDTV format at its full resolution. If the holes are made smaller and more numerous, brightness declines, and most people prefer a bright picture over a bland one.