This short guide draws on the many comments and questions that we have bumped into over the years when talking to our rent and hire customers. For our home page click Plasma LCD Rental
| Stand close to the screen and you will see that the picture comprises of many light emitting dots. The dots are known as pixels and represent the screen resolution. Important to understanding the difference between LCD and Plasma Screens is the understanding that with Plasma, each pixel emits its own light whereas with LCD, there is a light in the back of the screen that sends light through the pixels. LCD is known as a back lit type screen. Hence, Plasma offers better colour contrast as black appears as black whereas, on a LCD screen, black appears slightly greyish and not really as a true black as light from the back light comes through. |
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| In addition, Plasma is favoured for its viewing angle and this is very relevant when used in an Exhibition environment when people may be approaching the screen from the side. With LCD, people approaching the screen from the side may see a faded image. With advancing LCD technology, this affect is being reduced. |
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Any still image displayed on the screen for a length of time will burn itself in and appear as a ghostly image even when the picture changes. This is referred to as burn in. Plasma screens suffer from burn in after two hours whereas LCD screens do not suffer burn in from this until much, much later. Hence Plasma is unsuitable for showing still images.
A higher screen resolution equates to a sharper picture but has a relation to the size of the screen and, the original picture source. A low resolution on a big screen is OK if people are viewing it from a distance and in the case of a 42 inch screen with a 1024 x 768 resolution, we would advise 4 m / 10 foot minimum. HD (High Definition) is a description used a lot these days and all our screens are HD ready. For Full HD the screen has to have a resolution of at least 1080 horizontal lines i.e. a resolution of 1920 x 1080. However, the saying, rubbish in, rubbish out very much applies and the screen can only show what it gets. A picture taken on a digital camera will be transferred many times - from the camera, to flash memory, to a computer, to the internet on a server showing a Google image, then from Google back to a PC, then onto DVD disk, then into a DVD Player and then eventually onto an LCD Screen. At each stage quality may suffer. And in the same way, the quality of the DVD, the DVD Player, the length of cable to the screen and, affect of cable connectors and junction boxes, can all have an affect. Signal input quality can also affect Response Time.
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Signal input quality can also affect Response Time. This is how quickly a pixel can change when showing action such as a sports event and Plasma has a better Response Time. This is because the Plasma pixel can change from say red to green in one pulse whereas an LCD pixel goes from red to inactive, to green.
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Also, old programs such as Microsoft PowerPoint 2003 were not designed for wide screens. Plasma and LCD screens have a ratio of 16 to 9 - imagine units length to units height. Old programs were designed for old displays with a ratio of 4 to 3. Now, Plasma and LCD Screens can compensate to avoid the short and fat affect (see the pictures), from stretching a 4:3 image to 16:9 but. you may lose the extreme edges of the image or not be able to fully utilise the Plasma LCD screen. This unused area gives what is known as the letter box affect. The latest version of PowerPoint (2007) and professionals, take care of this for you.
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Neither Plasma or LCD Screens are suitable in sunlit areas as they do not emit enough light to counteract the effects of glass reflection and direct sunlight. For these circumstances you need a sunlight readable screen. (We do not hire these.)
For much more technical information visit Wikipedia on LCD and Wikipedia on Plasma Displays
For help contact John on 020 8397 0197, 07957 972595 -We rent to private individuals and companies, in London and north Surrey and southern England.
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Q7db Limited rents Plasma LCD TV Screens to London, Home Counties and Exhibition Centres at Birmingham NEC, Earls Court, Olympia and Excel
