How to buy a satisfactory HDTV TV set?

Maybe it's because of the newspaper TV ads claiming that HDTV TV programs will soon be on the air in large numbers, or because of the influence of your colleagues, relatives, or friends, that you may already be thinking about buying an HDTV. Compared with traditional TV, HDTV is not only a big leap forward in picture quality, but also with a good DVD player can get a very good picture enjoyment. And it's a great time to buy an HDTV, as there are a number of good choices on the market at reasonable prices.

But there's some homework to be done before you go, to make sure you're satisfied with your HDTV's performance, and there's nothing worse than having an inappropriate TV in your living room.

Which TVs are true HDTVs?

The first thing you'll notice when you walk into an electronics store is that most HDTVs have screens that are almost twice as wide as they are tall, which means they have a 16:9 aspect ratio.

The first thing you notice when you walk into an electronics store is that most HDTV models have screens that are almost twice as wide as they are tall, meaning that the screen ratio is 16:9, rather than the 4:3 ratio of a traditional TV. When watching movies, the widescreen is significantly better because the 16:9 ratio is closer to that of a movie theater screen; and when watching sports, the widescreen is able to show more live action, almost at least 1/3 more than a 4:3 ratio screen! Some are labeled "HDTV", some are labeled "HDTV-ready" or "HDTV?monitors". The label "HDTV" means that the TV set has its own internal digital tuner, while "HDTV-ready" and "HDTV?monitors" mean that the TV set is capable of high definition. HDTV-ready" and "HDTV?monitors" mean that the TV is capable of high definition, but does not have a built-in tuner, and the HDTV signal is fed through an external source (such as a TV box, satellite receiver, or standalone digital tuner).

You should also look at HDTV's close cousin, the lower-resolution Enhanced-Definition?TV (EDTV). Many cheaper plasma TVs and LCD TVs with screens smaller than 20 inches are EDTVs, not HDTVs, and these EDTVs have a picture resolution of 480p (Progressive-Scan), which is better than a regular TV's 480i (Interlaced-Scan), but their resolution is still not as good as progressive-scan DVDs. resolution is still the same as that of a progressive-scan DVD player connected to a digital TV to play DVD disks, without the high resolution of 720p and 1080i that HDTVs have. While EDTV can input HDTV signals from an external tuner, satellite receiver or TV box, the output is reduced to 480p resolution.

What the basic parameters mean

When shopping for an HDTV set, there are a lot of different numbers to look at. One of the most important is "screen size," which, like a regular TV, is measured in diagonal screen length.

Another technical parameter that manufacturers make a big deal out of is "contrast ratio," and it's not uncommon for this to be overstated, with 3,000:1 and higher. Unfortunately, however, now manufacturers of marketing departments like to exaggerate on this point, so when shopping in the manufacturer's nominal contrast ratio to have reservations. Generally speaking, these nominal contrast values are derived under different test conditions or under non-realistic conditions of use and are not accurate. A properly tuned CRT TV will typically have a contrast ratio of 300:1 to 700:1, with newer LCD or DLP models increasing the contrast ratio to 900:1. These values are much lower than the inflated nominal values because the color temperature and whiteness are correctly adjusted during the test and the values are calculated using a test template rather than measuring between full brightness and full blackness of the screen. The color temperature and whiteness are correctly adjusted during testing, and values are calculated using a test template rather than measuring between full brightness and full blackness.

Because of the glaring showroom lighting in electrical stores, and to make the picture look more eye-catching, the picture on most of the televisions displayed on the floor is over-adjusted. Some of the technical parameters that are not seen in the manufacturer's literature but are very useful include: color temperature (used to indicate whether the basic white of the picture is reddish or bluish), gray scale (the level of gray between the pure white and pure black of the picture), and so on. The significance and usefulness of these parameters can be easily grasped through some video test disks available in the market.

Picture quality

After you've gone through the selection process and targeted a few of the candidates, you'll need to get a little closer and take a closer look at their picture quality performance. The best thing about those big supermarkets is that you can compare the picture quality of multiple TVs at the same time, but even if they're broadcasting the same high-resolution programs at the same time, their adjustments may not be the same, so you won't be able to judge the true quality of the TVs in the face of the widely varying picture quality, and the following are some tips on how to make adjustments to compare and contrast your choices when you're buying.

Press the TV remote's "Menu" button to bring up the on-screen menu, and select "Video/Picture?Adjustments". and Sharpness are set to their maximum values, now reduce the Sharpness value until the edges of the image are no longer unnaturally bright, then reduce the Contrast value until the highlights are no longer excessive and are naturally balanced with the rest of the image. Also, the color temperature may have been turned up too high, making the whites look bluish, so if there is a color temperature adjustment option in the menu, turn it down slightly. Then, turn off all picture "enhancement" options, such as Scan Velocity Modulation (SVM), skin tone correction, image noise reduction, factory preset modes, and so on. For most HDTV sets, there are "user-defined" or "expert" options to make these adjustments to make the picture look more natural.

Now that you're ready to seriously compare TVs, you'll find that each of the different types of HDTV TVs has its own picture quality characteristics. Direct-view and rear-projection CRT televisions have deep, rich blacks, but separated triple* back projectors must have regular red, green, and blue convergence adjustments to ensure accurate color reproduction and to avoid a particular color overflow caused by projection* shifts. LCD, DLP, and plasma televisions, on the other hand, are very bright and sharp, but they have a harder time reproducing true blacks and showing light-to-dark gradations, and the blacks they reproduce are not deep, pure blacks, but rather a very dark gray.

The advantage of buying a TV at an A/V store instead of a supermarket is that you get to do some hands-on work. You can bring along a few of your favorite DVDs and play reference clips on the different brands and models of TVs you're looking at to get a rough idea of picture quality. When comparing, pay particular attention to the representation of the three primary colors of red, green and blue (which are the three primary colors of light, i.e. the video primary colors, as opposed to the red, yellow and blue primary colors of painting that you have learned in the past). Even though parameter settings can theoretically guarantee the exact three primary colors, different manufacturers have their own ways of dealing with them. Does the grass look natural? Or is it too brightly colored? Or is it yellowish or bluish? Does the sea look blue enough? Or is it a little on the pink side? Red reductions can be particularly problematic at times - does the red look overdone? Are there spots inside the color blocks? Does it look orange-reddish?

Take note of the transition from dark to light on the screen, and look for a relatively flat scene with a large contrast with the background (e.g., a wall at night, etc.), and with a good setup, there is a naturally smooth, layered transition from dark to light. Some LCD, DLP and plasma televisions have some difficulty in this regard, with color blocking and more noticeable gray level changes.

Finally, try a clip of the camera panning across a background with more diagonal lines, such as a stadium bleacher or a row of windows. Does the image look stable? Do the lines break or does the resolution drop?

Standard and high resolution

Most televisions broadcast a standard 480i signal, and some can convert a 480i signal to 480p or higher. However, this is not a perfect solution, you may see some minor problems in the moving picture, such as: blurring, jaggedness, stuttering, etc. Faroudja's DCDi (Directional?Correlation?Deinterlacing, Directional Correlation Deinterlacing) technology is specifically designed to solve this problem, and all TVs with this technology are generally better than their predecessors. TVs with this technology are generally stronger.

Adjusting picture size

Because the majority of TV programs are still in the 4:3 aspect ratio, TV manufacturers have had to think about how to view 4:3 programs on the growing number of 16:9 TVs. All widescreen televisions have a control option, commonly referred to as "screen ratio", "picture size", "screen size", etc., which is used to match the picture to the screen. This option is used to match the picture to the screen. On a widescreen TV, you can watch TV programs in the standard 4:3 ratio, but with black or gray (optional on some TVs) border strips on the left and right sides of the screen; you can stretch the screen horizontally to fit the wide screen; and you can stretch the screen both horizontally and vertically to fit the wide screen. For video enthusiasts prefer the first way without stretching, which does not change the proportion of the picture, but reduces the viewing area, your 60-inch widescreen TV at home can only be used as a 44-inch regular TV. The second way to stretch the picture horizontally could conceivably result in a distorted picture, with a round ball becoming like an egg and people looking fatter. The third method, which stretches the picture horizontally and vertically at the same time, makes an orb look less flat, but at the cost of cutting off the top and bottom of the picture.

Different manufacturers have different approaches to screen stretching, and some work significantly better than others. So even if you're a video enthusiast and won't be using this feature very often, it's still worth looking into it before you buy. While all HDTV televisions can adjust the picture ratio of 480i standard TV program signals, you'll still want to be aware of whether they can adjust the picture ratio of 480p video signals coming in from a progressive DVD player as well as high-definition video signals. Some televisions automatically lock the aspect ratio when receiving HDTV and 480p video signals.

Other details to look for

If you're happy with several HDTV televisions when comparing picture quality, then perhaps you'll want to compare some other details. Holding the TV's remote control over and over again for a while, are the buttons positioned in a way that matches what you're used to? Are the buttons backlit so you can easily find them at night? Are there shortcuts that you can use without having to go through multiple menus?

If the Picture?In?Picture (PIP) feature is important to you, see if the selected TV can use it with all input sources, especially with high-definition video signals?

If you choose an LCD or DLP front projector, be aware that projection bulb replacement is one of the more important considerations. The life of a projection bulb is about ? A few thousand hours, with different product lifespans varying from manufacturer to manufacturer, and replacing each bulb can cost more than $2,000 in some cases. But then, you can replace the bulbs yourself, and replacing them with new ones will return your projector's brightness to nominal values.?

Sources of HDTV signals

Depending on the location, there are several ways to receive HDTV signals:

? Through an antenna:

If you live near a major city that has digital TV terrestrial broadcasting, it may be possible to receive HDTV programs through a wireless antenna, but of course you'll need a digital tuner built into or external to your HDTV TV set. This is undoubtedly the cheapest way to get HDTV programs, since wireless HDTV programs are free just like regular TV programs.

? Through cable:

If you don't have a wireless HDTV signal station near where you live, or if you don't want to install an antenna, you can contact your cable company to see if they offer HDTV programming, which is available through cable in most cities in North America. For a small monthly subscription fee, the cable company will provide a set-top box to receive HDTV signals. Most set-top boxes have analog color-coded video inputs, and a few have DVI digital video inputs, and the list goes on.

By satellite:

In the U.S., for example, companies like DirectTV, Dish?Network, and Voom offer nationwide HDTV satellite TV signals for viewing.

If you don't currently want to, or aren't likely to, watch HDTV programs, there are still two reasons why you should choose an HDTV set when you buy one. One is that even if HDTV TV programs aren't available in your area, they will be soon in a very short time, and the other is that a high-definition TV will give you more visual enjoyment, especially when watching DVD disks.

Conclusion

Buying a satisfactory HDTV television set is not easy, especially when you consider that you will be using it every day. But you can narrow down your choices considerably by focusing first on screen size and price. By following some of the knowledge mentioned above, you'll be able to pick with more confidence. No matter what HDTV you buy, one thing is for sure: its picture quality will be far superior to that of your old TV at home.

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