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Consumer Reports - Projection-TV

JQOIndira29260821 2022.06.27 22:01 조회 수 : 1






The least expensive--and most common--type of is a .

Microdisplay sets use liquid-crystal display (LCD), digital light processing (DLP), or liquid crystal on silicon (LCoS) technology in place of CRTs. These TVs are slimmer, lighter, and more expensive than comparable CRT-based sets. More of them are appearing in stores, and their prices are starting to drop.


WHAT'S AVAILABLE



Major brands include

The smallest sets, measuring about 42 inches diagonally, offer only a few more inches of screen than a conventional 36-inch set. Rear-projection sets with 50- to 60-inch screens are the best sellers. The largest of these TVs have screens measuring 70 inches or more. Keep in mind that a set with a 57-inch screen could be overwhelming in a modest-sized room. CRT-based sets are floor-standing units about 24 to 30 inches deep that take up about 8 square feet of floor space. They weigh about 200 pounds and are mounted on wheels. Microdisplay models may require a stand. Most are about 15 to 20 inches deep and weigh about 100 pounds.



Most rear-projection sets now on the market are digital (HD-capable) sets, but there may still be a few analog models. Both types can accept regular TV signals, but HD-capable sets can best display the superior images you get from DVD players and from HD sources (antenna, satellite, digital cable, or digital-video players/recorders). HD-capable sets generally cost a few hundred dollars more than comparably sized analog models. Most have a wide-screen 16:9 aspect ratio that resembles a movie-theater screen.



Within the HD category, there are three types of


HD-ready sets. Also called



You can also get digital broadcasts, including HD, over the air, via an antenna. To do so, youll have to buy a digital tuner called an ATSC (Advanced Television Systems Committee) tuner--the external box costs a few hundred dollars. However, theres no charge for service as there is with cable or satellite.
Some satellite receivers also offer a built-in ATSC digital tuner. To receive digital programming via antenna, you must be fairly close to a transmitter, with an unobstructed view. With digital signals, youll either have a clear, strong signal or none at all.



Integrated HDTV sets. Also called HDTVs, these have the ATSC digital tuner built in, which enables them to decode any digital signals, including HD, with no additional equipment when used with a roof antenna. You may be able to receive the major networks HD offerings transmitted over the air in your area, but not the premium channels available on satellite and cable.

To get HD via cable or satellite, integrated sets require an HD-capable cable box, CableCard, or satellite receiver--the built-in digital tuner only works for off-air digital broadcasts.


Starting in July of 2005, all new TVs with 36-inch or larger screens --a category covering virtually all projection TVs--were required to have a built-in digital tuner to comply with a government ruling.



Digital-Cable-Ready (DCR) sets. Some new integrated models, called digital-cable-ready (DCR) or plug-and-play sets, can receive digital-cable programming without using a set-top box. For HD and premium cable programming--and possibly for any digital programming--you must insert a CableCard into a slot on the set.

You usually have to pay a few dollars a month to rent the card from the cable company. Current DCR TVs are not interactive, so even with a CableCard in the slot they cant provide features such as an interactive program guide, video on demand, or pay-per-view ordering via remote.

Second-generation DCR TVs and CableCards should be here soon, and theyre expected to have two-way capability, allowing for interactive features. Integrated sets typically cost more than HD-ready sets, with digital-cable-ready models costing the most.



IMPORTANT FEATURES


Virtually all projection TVs have the features that are now standard on regular 27-inch and larger TVs, plus some features that arent so common--such as dual-tuner picture-in-picture (PIP) or a variant side-by-side picture mode.


Most TVs have several types of inputs that handle varying levels of quality. An antenna/cable, VHF/UHF or radio frequency (RF), input is the most basic connection, and it can be used with almost any video source. A composite-video input will give you slightly better picture quality and is often used with a VCR or regular cable box.

An S-video input lets you take advantage of the still-better picture quality from a digital-cable box, a satellite-dish system, a DVD player, or a digital camcorder. A component-video input offers superior quality, making this a good choice for progressive-scan DVD players, high-definition satellite receivers, and HD digital-cable boxes that have the corresponding output.

Most HDTVs have DVI or HDMI inputs, which provide a high-quality digital connection to devices such as DVD players, digital-cable boxes, and satellite receivers. DVI signals carry only video; HDMI signals carry audio and video on one cable. The digital-to-digital connection may ensure optimal picture quality.
These connections allow the content providers to control your ability to record certain programming. Many sets have more than one of a given type of input. Having two or three S-video or component-video inputs is a plus. For a camcorder or video game, front-panel A/V inputs are helpful.


Audio outputs let you direct a TVs audio signal to a receiver or to self-powered speakers. Integrated digital TVs also include a Dolby Digital audio output for surround sound (available from some digital broadcasts). An automatic volume leveler compensates for the jarring volume jumps that often accompany commercials or changes in channel.



Auto convergence provides a one-touch adjustment to automatically align the three CRTs images to form an accurate picture. Its much more convenient than manual convergence, which can require time-consuming adjustments. Manual convergence does allow finer control, though.
The best bet is a set that has both manual and automatic convergence. (Convergence is not necessary on LCD, DLP, or LCoS models.)



Stretch and zoom modes on wide-screen sets will expand or compress an image to better fill the screen shape. This helps to reduce the dark bands that can appear above, below, or on the sides of the image if you watch content thats not formatted for 16:9 screens.

(The picture may be distorted or cut off a bit in the process of stretching and zooming.) Those bars make the slightly smaller. On CRT sets (but not LCD, LCoS, or DLP models), the bars can leave burn in ghosted images on the screen over time, as can any images left on the screen for long periods--say from a stock ticker.


If you watch many movies, look for a film mode feature on HD sets. This feature is also called 3:2 pulldown compensation or brand-specific names such as CineMotion. This can make moving images that were converted from film to video look less jerky, with less jaggedness around the edges.


HOW TO CHOOSE



Here are some points to consider in choosing a rear-projection TV:


Consider space before settling on screen size. Most rear-projection TVs have screens measuring 42 to 65 inches. You might be tempted by the biggest screens, which can span as much as 70 inches or more, but take a breath--and some measurements--first.

Figure out how much floor space you can spare, and plan to view the TV from about 7 to 9 feet away for optimal picture quality.


Weigh depth and price in choosing a display type. Once you know how much room you have, decide whether size or price is more important. CRT-based sets are floor-standing models with deep cabinets mounted on casters. Some take up as much space as an armchair or loveseat.

Most microdisplays are tabletop units. You buy a stand separately for a few hundred dollars or more. Would you prefer to save money with a bulkier CRT set or spend more for a slimmer microdisplay?


Consider reliability. CRT technology has been used in rear-projection TVs for years and has generally been quite reliable. Note, though, that any pattern left on a CRT screen for long periods--such as a stock ticker or video game--can burn into the tubes of a CRT-based model, a permanent ghosted image on the screen.  Most warranties dont cover burn-in. This problem doesnt affect other types of rear-projection TVs.

Microdisplay technologies are newer and havent established a track record for long-term reliability, but theyre not vulnerable to screen burn-in. They may require lamp replacement, however, which can cost a few hundred dollars. Factor these considerations into your decision.


Focus on picture quality. Its a little harder to find top picture quality in rear-projection TVs than in plasma TVs, so youll have to be choosy. The best sets can deliver very good picture quality with HD content and good picture quality for

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