LCD Vs Plasma TVs; The Essential Decision
Jul/090
Flat screen TVs are now commonplace in many homes. The most popular forms of these televisions are plasma and LCD. But as a consumer which can be considered the best choice? Hopefully the following article will highlight some of the fundamental differences between the two technologies and how this affects the buyer.
First and foremost it is important to understand the different processes involved in both plasma and LCD technology. While these types of TV may look the same, within there are completely different processes at work producing an image. Apart from both being thin and attractively styled, they have few similarities.
A Plasma TV utilises a system of miniscule plasma gas cells that are charged by electrical current to create changes in UV light. This light is then filtered through phosphorus gasses of each primary colour to make an image. LCD TV screens on the other hand resemble an electronic sandwich, with liquid crystals between two ’slices’ of glass. Once again varying electrical current is applied to the crystals in order to create an image.
One of the major benefits that LCD TVs have over plasma variants is native resolution. This industry term simply refers to the number of pixels on the screen and in this particular instance means that LCD TVs have a higher resolution in terms of pixels than plasmas of a similar size.
One of the most touted benefits of LCD TVs is that they consume far less power than plasma varieties. This has become an increasingly important point in recent months as EU directives on energy consumption have come to the fore in electronic companies’ thinking. It is estimated that some models of plasma TV used thirty percent more power than a LCD of a similar size; the result has been some commentators labelling plasma TVs as the four by fours of the home.
It is also evident that LCD screens tend to have a longer lifespan than plasma models. Early models apparently lose half of their brightness after a measly twenty thousand hours although the latest varieties boast a lifespan of thirty to sixty thousand viewing hours. On the other hand, the average LCD TV typically has a guaranteed sixty thousand hour lifespan.
Screen burn is one of the more commonly highlighted problems with plasma TVs although this is becoming less of an issue. That said, even modern plasmas do suffer from screen burn, a result of a continuous image being shown on the screen and leaving a residual ghost image when viewing other channels. LCD TVs do not suffer from this problem at all.
So which should consumers buy? LCD or Plasma? This decision depends upon the size of the screen. In the majority of cases plasma TVs are better in larger sizes, for example those above fifty inches whereas LCD variants are better in smaller sizes. That said, those with an environmental conscience will be easily swayed by an LCD due to their lower power consumption and subsequent ecological validity. Additionally the longer lifespan of LCD televisions make them a better value buy although this is really a minor consideration. Ultimately the choice is down to the consumer but with plasma TVs apparently on the wane it is understandable that more people will see the benefits of LCDs in the future.
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Plasma TV Vs LCD, The Consumer Choice
Jul/090
The plasma TV has been with us for some time now and is preferred by many homeowners. However with industry experts surmising that LCD televisions will be more widespread in the future due to energy efficiency problems with plasma TVs, the time has come for consumers to decide which option to take. Plasma or LCD TV, which is the better choice?
Plasma and LCD TV models look almost identical, both are flat, elegant and typically both offer a stunningly sharp and clear picture. There are however fundamental differences between the two technologies. In terms of the improvements from the older, CRT televisions both plasma and LCD models are clearer, they have a style about them that fits into modern living, most have a wide viewing angle and as they are wall mountable they are a brilliant space saving option. Additionally as both varieties are widescreen, they allow the viewer to watch movies how they were supposed to be seen, in the perfect aspect ratio.
The LCD TV works using a liquid crystal display. This put simply is hundreds of thousands of tiny pixels that each change colour and shade to create an overall image. Behind is a backlight that gives the image its brightness and as electronic current is passed through the device, the pixels change rapidly to formulate moving images.
The plasma TV on the other hand is constructed of two sheets of glass, with the gap filled with xenon or neon gas. Behind this screen sits phosphors for each primary colour, as electricity hits xenon it produces UV light that in turn hits the phosphors so they change colour rapidly and hence create an image. This process is far more wasteful than LCD and hence uses more power.
Naturally each type of TV has various benefits and disadvantages, the following will put forward a seven step process to assessing the differences between plasma and LCD.
The first category is size and weight. Typically plasma televisions are available in larger screen sizes, in fact up to around 71 inches, they are however normally heavier than LCD models. In comparison LCD devices are normally smaller, around a 42 inch maximum although this likely to increase in the future.
In terms of picture quality there is not much to split the two; however LCD screens normally have a higher resolution in smaller sizes. One problem that occurs with plasma TV models is image burn. This means that after a long period the screen shows a residual image, typically a network logo. This does not happen with LCD screens.
Viewing angle is generally better with plasma although with the more recent LCD models this is less of an issue, both have a viewing angle of around 160 degrees. Brightness is generally better with plasma TVs although on the other hand LCD screens have less glare and are hence better for bright rooms and environments.
Both TVs have a lifespan of around sixty thousand hours meaning that if the television was left on continuously it would work for almost seven years. Energy efficiency can be a problem with some plasma models and has become a major issue in recent months with technology companies focussing on efficiency as eco laws start to take effect.
Hopefully this article has highlighted the common differences between the plasma and LCD TV. Seemingly the growing trend is for LCD models due to energy efficiency issues; ultimately the choice comes down to personal preference.
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Plasma and LCD TV Models; The Fundamental Differences
Jul/090
Plasma and LCD TV models have been with us for some time; both experiencing popularity in homes across the land. The current industry conjecture is whether LCD will become the predominant technology in the future, mainly down to energy efficiency issues that have arisen after yet more European legislation on energy consumption. Hopefully the following article will detail which technology represents the best option for consumers.
Both plasma and LCD TV models are identical in form, naturally both are thin and have a flat screen and in the majority of cases are stunning to look at and a stylish addition to any home. Within the televisions themselves however there are markedly different technologies in operation to produce moving images. Obviously both plasma and LCD TV types are a great improvement on the CRT TVs of old, but do the differences between the two technologies seriously affect the buying decision for consumers?
Plasma televisions operate as a sandwich of tiny liquid crystals between two sheets of glass. These hundreds of thousands of pixels are controlled by specific current changes that affect shade, colour and brightness. With the use of a backlight the changes in shade are displayed on the screen. It is only when all of these crystals are altered rapidly that an image becomes visible.
Plasma televisions on the other hand have a similar glass sandwich but instead of liquid crystals contain a gas such as xenon or neon. Once again current is passed through the gas and this created an image, it is only when this image is passed through a layer of phosphors, representing each primary colour that the true image is created. This process requires considerably more power than LCD, meaning plasma is far more wasteful.
Understandably the two technologies have a variety of advantages and disadvantages. What follows is a categorical analysis.
First is the size and weight. Normally plasma televisions are available in larger screen sizes, particularly fifty inches or more. Typically plasmas are heavier than your average LCD TV but this is marginal. At the moment plasmas have the edge in terms of screen sizes but technological developments are rapidly changing this situation.
There is not much to call between the two technologies when it comes to picture quality. Most experts believe that plasma televisions have better black levels that LCDs but it is evident that LCD TVs produce a sharper image, especially in smaller screen sizes.
A common problem with plasmas is image burn. This is when a residual image is displayed on the screen after the image has been shown for extended periods of time; normally this is a network logo or for gamers the screen display of their favourite game. This is not a problem for LCD models.
Viewing angles for both types of television are about 160 degrees but it is generally understood that plasmas have a slight edge. In terms of glare, normally an LCD TV performs better in brighter environments although due to the poorer black levels, people who watch television in the dark would be better suited with a plasma.
In terms of lifespan the understanding is that while an LCD television can guarantee around sixty thousand viewing hours, around seven and a half years of continuous viewing, plasmas will normally suffer sooner. Some plasmas have been reported to lose half of their brightness after around twenty thousand viewing hours.
It is hoped this article has highlighted some of the differences between plasmas and LCDs. As a consumer the choice is difficult but with recent reports stating that plasmas are almost thirty percent less efficient than LCDs it is understandable that those with an environmental conscience and a keen eye on their household bills will opt for the LCD path.
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LCD Tvs are a Great Alternative to Crt
Jul/090
You may not realize it, but you probably use an LCD device every day. If you own a laptop computer, a microwave oven, a modern thermometer, a CD player, or a digital watch, all these are LCD technology. LCD stands for “liquid crystal display.” Look at the numbers displayed on your microwave oven; do you see how crisp and clear they are? How about the dials and numbers on your digital watch? LCD technology beats the traditional cathode ray tube and projection TVs in clarity, resolution and sharpness. Not only is it virtually impossible to mount a clunky cathode ray tube TV on your wall, but tubes wear out quickly and the picture quality of projection TVs is notoriously poor.
For home entertainment purposes, most people are especially interested in LCD televisions. When LCD technology was first introduced, the prices of these TVs were typically very high. But in the past few years, LCD TV prices have dropped as the technology became widespread and affordable. Try this simple experiment: go to a large electronics store and ask the sales staff to show you an LCD TV and then a traditional cathode ray tube TV (if they even have one!). You’ll notice the picture superiority of the LCD immediately. Plus, LCD TVs are thinner, lighter, and use less power than cathode ray TVs. LCD TVs come in high definition (HD) compatible models that create an even sharper image, in thin, flat panel models, and widescreen models. Each type of these LCD TVs have specific advantages. For example, if you want an LCD TV in your bedroom but don’t have a lot of wall space, a flat panel model will serve you well. But in your living room, you’ll most likely want a TV that has high definition and a wide screen to set up your home theater components.
When you decide to buy an LCD TV you have many models, sizes, and pricing options to choose from. Consumer guides and customer reviews rate the “best of 2008” LCD TVs as:
- The Samsung 52-inch 1080p HD TV- The Sony Bravia 52-inch 1080p HD TV- The Panasonic 50-inch 1080p HD TV- The Sharp Aquos 42-inch 1080p HD TV- The Samsung 32-inch 720p HD TV
You can find the LCD TV that meets all your space requirements, including 19, 37, 46, 61 and 65-inch TVs. You can also find great prices on LCD TVs locally or on-line. One thing is certain: cathode ray tube televisions are rapidly becoming obsolete in comparison to LCD HD TVs. Projection TVs are no longer manufactured. Also, LCD technology tends to be cheaper than plasma technology for televisions and computer monitors. The best buying strategy is to specify what kind of equipment you need, the size of the TV you need, and what type of TV system you can afford.
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Things to Consider Before you Buy your Flat Screen Tv
Jul/090
When you are thinking about which Television to buy, you need to carefully consider size and location, especially if your options are a Plasma TV, LCD flat screen TV or a rear projection TV. Flat screen TV technologies are limited by screen size. You can get LCD TVs in a variety of sizes ranging right from tiny to the very large. Plasma TVs are best viewed starting from 37 inches. The HDTV screens tend to be a lot wider than their height, appearing rectangular. Because of this, the space requirement varies from TV to TV. The specialty of flat screen TVs is that they can also be wall mounted or placed on stands, making them a space saving unit.
Room Size
A 30 to 40 inch HDTV might be suitable for a small room particularly if you plan to place it in an entertainment unit or against a narrow wall. But for a big room where you have sufficient wall area, a rear projection TV of a larger size will look good. For those who plan to go in for the home theater system, front projections TVs are a good choice. After you’ve decided where you will place your TV, you need to consider how far you will sit from your TV screen when you watch it. If there is enough distance, a large screen TV is fine. But if viewing distance is very limited, and you opt for HDTV, bigger need not mean greater picture clarity. You cannot view a small screen from too far off or a huge screen from very near.
Viewing Distance, Angle And Lighting
The best way to figure out the ideal distance to maintain between you and your screen is to divide the screen size by 5. Seat yourself so that you are looking directly at the middle of the screen. While considering performance of TVs, the angle at which you view them matters a lot. With plasma TVs, which have a 160-degree wide viewing angle, you can put them anywhere in your room. The viewing angle for LCD TVs is lesser at 120 degrees; while rear projection TVs are at 90-100 degrees. So if you are not sitting directly opposite the TV the lesser the viewing angle, the less satisfying the picture quality. Bright lights are suitable for plasma and LCD TVs but for projection TVs you must have little or no light.
Picture Quality
A perception of picture quality can vary from person to person, and TV to TV. It depends on how the TV is constructed and the internal processing method. The TV must have good black levels since these produce better details. CRT TVs are capable of better black levels. Digital TVs like plasma, LCD and DLP produce black that looks more like dark gray. When the picture shows good contrast, the impact is much more. Incidentally, there’s something called “burn in” that happens in Plasma TVs that ends up showing ghostly images on the screen, especially when you are watching a favorite sports channel or happen to be enjoying video games.
Thus, viewing criteria and location are important considerations when you shop for your flat TV.
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Buying a Television; The Important Decisions
Jul/090
It can be extremely troublesome deciding which television set to buy. Ultimately the choice seems endless, LCD or plasma, CRT or flat screen and even Sony Bravia, Sharp Aquos or Panasonic Viera. Unfortunately; for the consumer it is only through a dedicated programme of research and careful consideration that the correct decision can be made on exactly which type of television to select.
In terms of brands the choice is pretty much down to personal preference; for example many Sony aficionados will advocate a Sony Bravia television above all else. In the same way Samsung fans promote their own view and the same can be said for nearly all the major brands. This is why forums on the internet should not be completely heeded as on the brand level, people are swayed by corporate image. The best course of action is to read these forums but to then make a decision using your own experiences. For instance if you have had a Sony Bravia or Panasonic Viera in the past and enjoyed the experience, selecting a similar type of television can be advisable.
It is not just about deciding upon a brand however. There is a myriad of considerations that simply must be made. For example while many simply opt for the largest LCD or plasmaTV they can afford, this is rarely advisable; even if it will impress friends and family. The size of television should be decided upon taking into account the size of the room and the distance from the television that viewers will sit. In a similar vein, the position of the TV set is also vital. Many flat screen televisions can now be wall mounted for the ultra chic, modern look. Whilst this may be aesthetically pleasing wall mounting should only be used if the wires can be hidden away to achieve the minimalist style.
Today high definition or HD is becoming increasingly popular in many homes. Ultimately it is a form of transmission and display that shows images in much greater clarity than standard definition. Consumers are met with a myriad of terminology including 720i, HD Ready, Full HD and 1080p. Fundamentally 720i and HD Ready television sets are able to display HD signals but it only the Full HD or 1080p TVs that generate a true HD picture. While the full HD sets may cost a little more, they are in a sense “future proof”, meaning that they will not be superseded for some time.
Some modern televisions do however have flaws when it comes to displaying fast moving images, particularly sports and movies. Subsequently companies such as Sony, Panasonic, LG and Samsung have had to develop faster refresh rates for the images displayed onto the screen. For instance the latest generation of Bravia televisions now work on a 200 MHz frequency, when this is compared to a typical LCD television frequency of 50 MHz the refresh rate can be deemed far superior.
This article has not been intended as a buyer’s guide to televisions but instead as an informative piece of writing detailing some of the latest developments in television technology. It has given a brief idea of what buyers should look for in a televisions and highlighted the importance of personal choice whenever choosing piece of electrical equipment.
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