วันอังคารที่ 27 กันยายน พ.ศ. 2554
How Does an Led Tv Work?
Simply put, an Led television and an Lcd television are one and the same thing. The distinction between a suitable Lcd television and an Led model lies in the formula of backlighting. General Lcd screens are built by sealing a layer of liquid crystal in between two glass panels. Behind this are a series of Cold Cathode Fluorescent Lamps - Ccfl - that task light through the crystal polymer. When a controlled current is run through the crystals, they either add colour to the light, or block it out completely. In Led televisions, the Ccfl lighting is substituted by a sequence of Leds. As they are much smaller than Ccfl lights, televisions that are Led-backlit can be made much thinner and lighter than quarterly Lcd models. Some are even under an inch thick! Led televisions are also capable of greatly increased dynamic distinction - the ratio of distinction between black and white - use less power, and are more environmentally friendly when disposed of.
However, the differences don't end here. Currently there are two generally used methods of Led backlighting, known as Edge Leds and Rgb Dynamic. Each has advantages and drawbacks, so if you're reasoning of buying an Lcd television, it's good to know what each formula has to offer. In Rgb Dynamic models, a sequence of red, green and blue Led lights are positioned behind the screen. When an image is displayed featuring dark colours, the Leds in that area are dimmed while the intensity of the colour is increased. As a result, televisions with Rgb Dynamic backlighting have higher Dynamic distinction ratios than any other Lcd model, although they are still second to plasma technology when it comes to 'true' blacks. The downside of this formula is a loss of fine detail on small, inspiring objects that appear against a dark background - an image of a night sky is a good example.
Samsung Lcd Monitor
By contrast, the Edge Led formula is a wholly separate kettle of fish. This type of backlighting involves the placement of white Led lights around the outside edge of the screen. A light-diffusing panel is then settled behind the screen, which compensates for the lack of light arrival from the centre. Edge Led backlighting is not capable of the same Dynamic distinction ratios offered by the Rgb Dynamic method, because it can't dim the backlight as no ifs ands or buts in a localised area. However, it is the economy of the two methods, and televisions carrying this technology are some of the thinnest and lightest on the market, making them extremely easy to wall mount.
So there you have it - there are pros and cons to Led backlighting, just as there are pros and cons to Lcd and plasma flat screen Tvs [http://www.panasonic.co.uk/html/en_Gb/Products/Viera+Flat+Screen+Tv/Plasma+Tv/Plasma+Tv+Overview/2525930/index.html]. Both Led methods are currently quite expensive, so don't expect to find them in any budget range televisions for the time being. However, with technological breakthroughs occurring all the time, it probably won't be long before Led backlighting becomes yet someone else manufactures standard.
How Does an Led Tv Work?
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