Information Technology

Plasma or LCD or LED

Posted by cosmic  •  Filed under InformationTechnology, Internet

Plasma vs LCD vs LED

Big Screen

Plasma TVs use a sheet of miniscule individual plasma cells that create a picture when an electrical charge is applied.

LCD TVs on the other hand, use liquid crystal compressed between two glass plates - an image is created when electricity is applied to these crystals.

LED TVs use liquid crystal, but unlike regular LCD televisions they use a backlight made of hundreds of LEDs (light-emitting diodes) instead of a fluorescent lamp. The LEDs can be evenly distributed around the back of the television's panel or situated in the edges of the screen to create a very thin display chassis.

Please Note: Viewers are not enjoying the full benefits of the higher pixel count of 1080p televisions if they sit any further back than 1.8 times the screen width. At a distance of 2.7 times the screen width, they might as well buy a cheaper 720p set, as the eye cannot resolve the finer detail of a 1080p screen at that distance.

How well an image is displayed on a television panel (whether it is a Blu-ray movie, an HDTV broadcast or a high-definition video game) depends on a television's display technology and its image processing capabilities.

Contrast Ratio

A television's contrast ratio represents its ability to show detail in high contrast areas of the screen, in the form of minute gradations of colour and blacks or whites. For example, a panel with a low contrast ratio will struggle to show the higher or lower extremes of an image. In layman's terms, this means detail will be lost in bright areas as well as in dark scenes. In a Blu-ray movie, for example Batman Begins, the loss of detail in dark scenes will quickly become apparent.

Most manufacturers increase the contrast capabilities of their screens by dynamically altering backlight brightness. This allows extra detail to be shown in dark scenes and can be a life-saver for a panel with a low static contrast ratio. Some manufacturers have taken their estimations of this dynamic contrast ratio to excess, rating their screens at contrast ratios of 1,000,000:1 - and even higher. While these figures demonstrate the advantages of dynamic contrast ratio alteration, they don't need to be a big factor in your buying decision.

It is generally accepted that plasma televisions have better contrast ratios than LCD panels, due to the fact that a plasma television can completely deactivate the light source for individual segments of the screen. This means sections of the screen can be completely dark while others are displaying bright colour, unlike a traditional LCD screen which has a single backlight array that can only alter brightness levels for the entire screen.

The latest LED backlight technology allows the television to individually control backlight segments. This technology allows for contrast ratios similar to those produced by plasma television panels. However, edge-lit LED televisions - usually available in an ultra-slim form factor - will have lower dynamic contrast ratios than the backlit LED models so be sure to check this detail before you purchase.

Viewing Angle

The narrower a television's quoted viewing angle is, the smaller the range in which it produces a 'perfect' image with no loss of contrast or colour. Many manufacturers quote an unrealistically high viewing angle - close to a full 180 degrees in some instances - but the best way to test this, is to see the screens in person.

A wide viewing angle is important if the television will be placed in a large living area or will be regularly watched by multiple people simultaneously - most of us will have family and friends around to watch the TV at some point!

In general, plasmas have better viewing angles than LCD and LED TVs, with their images remaining solid and colourful at wide viewing angles while LCDs suffer from colour shift and loss of brightness. This is not always the case, though, so it is best to compare panels directly against each other if possible. LED televisions have superior viewing angles compared to LCDs due to their decentralised backlight distribution.


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