plasma screen television vs lcd screen tv :When it comes to high quality flat screen TVs, there are a number of choices available these days and the technology is constantly improving. However, as each competing TV screen technology matures and improves, the differences between them become more difficult to detect. And so it is with the comparison between lcd screen tv and plasma screen television.The big advantages of both kinds of TV monitors is that they are very thin, only a few inches thick. Because of that you can choose to either place them on a stand, as you have with televisions you have owned in the past, or mount them to the wall instead. They both also produce stunningly beautiful visual displays, especially when coupled with high definition television programming. But there are some subtle differences that you will want to be aware of though.plasma screen television have been in use for many years and they use inert gases that are illuminated to display colors on individual pixels on the screen. Their best feature is the high contrast image that they reproduce. The colors are extremely vivid and sharp and this is mostly due to the fact that plasma screen television are able to exhibit true saturated blacks, whereas other monitors, lcd screen tv included, usually have some compromise in how much true black they display.plasma screen television are also easily viewed from almost any angle and so if you have a wide room with seating that extends out at an angle from the front of the television set, you may want to consider this advantage, although recently many lcd screen tv have been steadily improving in their accepted viewing angle.One area that plasma TVs have historically had a disadvantage is in the amount of electricity needed to power them and how hot they run. It can cost more to run a plasma screen television if you use it very regularly, and it can generate quite a bit of heat inside, enough to warrant most manufacturers making use of a fan to cool them down as they run. This is not a noticeable problem unless the fan makes noise that can be distracting. So be sure to actually view a plasma screen television before buying that particular model and see if the fan noise is a problem.Another quirk of plasma screen television is that they can be susceptible to screen burn-in, which happens when one image is left on the screen for a very long time and it then becomes "burned into" the screen so that you can still faintly see it even when another image is displayed. This can happen on some TV channels that display an image that stays in a certain part of the screen for a long time, and if you play video games, there may also be a possibility that some games can cause this problem. So ask yourself before buying how you intend to use the TV, and if you happen to view programming that may have static screen images a lot of the time, it may be wise to choose an lcd screen tv as it does not suffer from this problem.lcd screen tv may not produce deep contrasty images like plasma screen television do, but the colors are still very pleasing and they can also be a better choice for brightly lit rooms since their display is not as susceptible to ambient light influences. However, they can tend to get more pricey than plasma screen television once you go above the 40 inch screen size.All in all though, either type of TV screen technology will do a great job for you. The best recommendation is before you buy, visit a local electronics retailer and view representatives from plasma screen television and lcd screen tv. Bring along your own movie that you are familiar with and look for the differences. Then choose the one that makes the most sense to you. There is no need to buy from the store as you can often save lots of money by making your purchase online instead, but by doing your homework you can make a more informed buying decision.
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This is a complicated topic: when choosing between LCD and plasma TVs, you're actually selecting between two competing technologies, both of which achieve similar features (i.e., bright, crystal-clear images, super color-filled pictures) and come in similar packages (i.e., 3.5 inch depth flat screen casing). To complicate the decision-making process further, price and size are two previous considerations that are rapidly becoming non-issues as LCDs are now being made in larger sizes and at competing prices with plasma TVs.
Despite all these similarities, these technologies differ in how they process and display incoming video/computer signals.
Plasma flat screen technology consists hundreds of thousands of individual pixel cells, which allow electric pulses (stemming from electrodes) to excite rare natural gases-usually xenon and neon-causing them to glow and produce light. This light illuminates the proper balance of red, green, or blue phosphors contained in each cell to display the proper color sequence from the light. Each pixel cell is essentially an individual microscopic florescent light bulb, receiving instruction from software contained on the rear electrostatic silicon board. Look very closely at a plasma TV and you can actually see the individual pixel cell coloration of red, green, and blue bars. You can also see the black ribs which separate each.
Whether spread across a flat-panel screen or placed in the heart of a projector, all LCD displays come from the same technological background. A matrix of thin-film transistors (TFTs) supplies voltage to liquid-crystal-filled cells sandwiched between two sheets of glass. When hit with an electrical charge, the crystals untwist to an exact degree to filter white light generated by a lamp behind the screen (for flat-panel TVs) or one projecting through a small LCD chip (for projection TVs). LCD monitors reproduce colors through a process of subtraction: They block out particular color wavelengths from the spectrum of white light until they're left with just the right color. And, it's the intensity of light permitted to pass through this liquid-crystal matrix that enables LCD televisions to display images chock-full of colors-or gradations of them.
PICTURE CONSIDERATIONS CONTRAST/ BLACK LEVELS Plasma technology has certainly achieved quite high contrast ratios, a measure of the blackest black compared to the whitest white. Many plasma display manufacturers boast a contrast ratio of 3000:1 these days though our tests have not proven these numbers out. Panasonic has long been the leader in plasma black levels and we measure contrast of a 42” HD Panasonic plasma at about ANSI 1450:1 – still impressive. Plasma displays achieve such impressive black levels by using internal algorithms to block the power to particular pixels in order to render a pixel "dark" or black. While this can limit a plasma television’s gray scaling, it does produce exceptionally black blacks – depending on the manufactured plasma display element (i.e. glass). A plasma TV uses the most power when it is producing full white. As a result, some 2nd tier manufactured brands of plasma TVs have an audible buzz or whining sound when displaying white or very light images. LCD (liquid crystal diode) displays, by contrast, utilize electric charges to twist and untwist liquid crystals, which causes them to block light and, hence, emit blacks. The higher the voltage passing through the liquid crystals in a given pixel, the more fully those crystals untwist and effectively block light - all of which makes these pixels darker. As opposed to plasma, LCD displays use the most power when displaying a very dark or black image. This is a difficult process, and despite recent improvements in LCD black levels, only the best LCD displays (like those produced by Sharp and Sony) have managed to topple the 1000:1 contrast ratio barrier. Recent improvements have brought LCD displays up to the level of plasma. The one continual drawback here for LCD is off axis viewing, when black levels consistently drop. ADVANTAGE: Closer than a year ago, but still Plasma. LCD manufacturers have made great improvements in black levels and in many cases have managed to match the contrast ratio of plasma displays. However, Plasma TVs still maintain a clear advantage in this category due to fading blacks when viewing LCDs from off axis. For scenes with a lot of dark and light images shown simultaneously - as with content originating from DVDs, video games, and NTSC TV signals - plasma TVs still consistently outperform LCDs. COLOR ACCURACY In plasma displays, each pixel contains red, green, and blue elements, which work in conjunction to create 16.77 million colors. Insofar as each pixel contains all the elements needed to produce every color in the spectrum, color information was more accurately reproduced with plasma technology than it was with other display technologies. The chromaticity coordinates were more accurate on most plasma displays. Though the color saturation resulting from the pixel design of plasma displays is remarkable, LCD technology has nearly caught plasma in gray scaling color accuracy. Plasma continues to exhibit more richness in color information and more natural coloration. Today, SMPTE color coordinates in top plasma TVs still normally outperform those in LCDs, which tend toward oversaturation. LCD displays reproduce colors by manipulating light waves and subtracting colors from white light. This is an inherently difficult template for maintaining color accuracy and vibrancy - though most LCD displays manage quite well. While color information benefits from the higher-than-average number of pixels per square inch found in LCD displays (especially when compared to plasmas), LCDs are simply not as impressive as plasmas with similar pixel counts. LCDs however, produce a typically brighter picture. Greens sometimes look too green and reds can run a bit warm, but in a room with bright outdoor lighting, an LCD would be my choice. ADVANTAGE: Preference to plasma but depends upon room light, manufacturer and model. Plasma color richness and naturalness will prevail in rooms with lower to normal lighting. LCDs will be better in very brightly lit rooms due to their inherent anti glare technology and brightness. VIEWING ANGLE Plasma manufacturers have made much of their 160° viewing angles, which is about as good as horizontal and vertical viewing angles get. This owes to the fact that each pixel produces its own light, rather than light being spread across the screen from one central source. Hence, each pixel is more readily visible because its brightness is consistent with every other pixel on the screen. One consistent area of superiority of plasma viewing angles is demonstrated when viewing dark material content, especially DVDs. Plasma TV holds the black levels from off axis, while LCDs lose black level intensity more as the angle off axis increases. This usually occurs after around 90 degrees. LCD manufacturers have done much to improve their displays' viewing angles. The substrate material on newer-generation LCDs by Sharp and Sony has helped to expand those units' viewing angles, though they still have some ground to cover before catching plasma. Expect the best LCD displays to have between 120 and 130 degree viewing angles. ADVANTAGE: Plasma
FUNCTIONAL CONSIDERATIONS
COMPUTER USE
LCD monitors display static images from computer or VGA sources extremely well, with full color detail, no flicker, and no screen burn-in. Moreover, the number of pixels per square inch on an LCD display is typically higher than other display technologies, so LCD monitors are especially good at displaying large amounts of data - like you would find on an Excel spreadsheet for example - with exceptional clarity and precision. For the same reasons, LCDs will also be a slightly better template for video gaming.
Plasma technology has increased anti burn in tactics as well as computer and static signal handling. There are still issues with each depending very much on the model and manufacturer. For example, most EDTV plasma televisions do not handle a computer input well and product a very jaggy image when viewing static images from same. Users may want to consider an commercial version plasma display if their application calls for a lot of computer use.
ADVANTAGE: LCD
FAST-MOVING VIDEO PLAYBACK
Plasma displays get the nod here because of their excellent performance with fast-moving images and high contrast levels. There are still some 2nd tier manufacturers whose plasma product displays some phosphor lag, a dragging from brights to darks.
While the "response time" of LCD TVs has markedly improved in the last couple of years, they still suffer from a slight "trailer" effect, where the individual pixels are just slightly out of step with the image on the screen. During fast moving sports scenes, the most discerning eyes can detect this slight motion response lag.
ADVANTAGE: Plasma
ALTITUDE USAGE
There is a reason LCD panels are the preferred visual display units for use on airplanes: LCDs aren't affected by increases or decreases in air pressure. Their performance is consistent regardless of the altitude at which they're utilized.
This is not the case for a plasma TV. The display element in plasma TVs is actually a glass substrate envelope with rare natural gases compressed therein. So, at high altitudes (6,500 feet and above), an air-pressure differential emerges, which causes plasma displays to emit a buzzing sound due to the lower air pressure. This noise can sound rather like the humming of an old neon sign. NEC has been effective in producing several plasma models that are rated to 9,500 feet.
ADVANTAGE: LCD, at 6500 feet and higher.
LONGEVITY
LCD manufacturers claim that their displays last, on average, 50,000 to 65,000 hours. In fact, an LCD TV will last as long as its backlight does - and those bulbs can sometimes be replaced! Since this is nothing more than light passing through a prismatic substrate, there is essentially nothing to wear out in an LCD monitor. However, one nasty little known fact about LCD technology is that as the backlight ages it can change colors slightly (think of florescent office lighting). When this occurs the white balance of the entire LCD will be thrown for a loop and the user will need to re-calibrate, or worse, try to replace the backlighting or ditch the unit altogether. Some of the early purchasers of larger LCD screens will be learning this tidbit in a couple of years. One thing that I’ve found in this industry, it is not easy to find out whether the backlighting on LCDs can be replaced. Manufacturers are either hesitant to discuss the topic, or they just don’t know.
Plasma, on the other hand, utilizes slight electric currents to excite a combination of noble gases (i.e., argon, neon, xenon), which glow red, blue, and/or green. This is an essentially active phenomenon, so the phosphoric elements in plasma displays fade over time. Many manufacturers state a new half life of 60,000 hours. While I am skeptical of this spec, I do believe strides have been made to nearly even the playing field with LCD. At half life, the phosphors in a plasma screen will glow half as brightly as they did when the set was new. There is no way to replace these gases; the display simply continues to grow dimmer with use.
ADVANTAGE: Even depending upon manufacturer quality.
SCREEN BURN IN
LCD technology is not prone to screen "burn-in" or "ghosting" (premature aging of pixel cells) due to the nature of the technologies “twisting crystals.”
With plasma displays, static images will begin to "burn-in," or permanently etch the color being displayed into the glass display element. The time it takes for this to occur depends greatly on the anti burn-in technology of the manufacturer. Recent improvements by plasma manufacturers have certainly extended the time it takes to burn in a plasma pixel cell. In the past I was concerned to place a DVD on pause 15 minutes. Now, many of the enhancements such as better green phosphor material, and motion adaptive anti burn-in technology are greatly reducing the risk of burn in. It’s gotten so much better that I don’t even worry about it anymore. In a new model plasma from any top tier manufacturer I would put “ghosting” estimates at an hour or more now (Ghosting can be “washed” out by displaying static gray material). Permanent burn-in I would put at more than 10 hours.
ADVANTAGE: LCD, but not as much of a concern as a year ago.
OTHER CONSIDERATIONS
PRODUCTION SIZE & COST
All television measurements are stated in inches and are for diagonal measurement of the screen from corner to corner – not including framing.
Both LCD and Plasma televisions are becoming more readily available in larger sizes though plasma still leads the size battle by a great margin. Pioneer and LG produce 61” plasma sizes while Panasonic has a readily available 65” model. Though it is not being imported into the U.S. yet, Samsung has produced a gigantic plasma television of 100 inches. Though such mammoth monitors are expensive, they exhibit none of the "kinks" one might expect with such large displays. In other words, even the largest plasma displays are reliable. Large plasma displays will consume power – try 675 watts for a 65“ display compared to around 330 watts for a 42” plasma.
The substrate material for LCD TVs has proved difficult to produce in large sizes without pixel defects owing to faulty transistors. Sharp produces one of the largest available LCD displays at 45 inches, while Samsung has a 46” LCD. Sony and NEC currently produce units measuring 40" diagonally. This will change very soon. These manufacturers will have very large LCD screens here this year if production goes as planned.
ADVANTAGE: Plasma though the playing field is leveling. Even though production costs and retail prices have come down for both technologies, plasma still has the edge as far as production cost and capacity go.
POWER CONSUMPTION
Because LCDs use florescent backlighting to produce images, they require substantially less power to operate than plasma TVs do. LCD displays consume about half the power that plasma displays consume. The reason: Plasmas use a lot of electricity to light each and every pixel you see on a screen - even the dark ones. Though plasma manufacturers have improved voltage consumption requirements a plasma TV will consume around a third more power for the same size display.
Advantage: LCD
PRICE AND RESOLUTION
LCD displays will have a higher resolution per same size comparison than plasma. The lowest resolution of a 40 inch LCD will be 1366 X 768 – easily full HD resolution in 1080i or 720p. A 42 inch HD plasma has a resolution of 1024 X 768. While this is not truly an HDTV resolution, it’s close enough so that it’s difficult to detect the difference. A 50 inch plasma TV will have a resolution of 1366 X 768, while a 45 inch LCD displays 1920 X 1080 (1080P) resolution
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