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Although LED (Light Emitting Diode) technology has been around since the early part of the 19th Century, most people remember the first use of LEDs in the bright red segmented watch displays or calculator displays of the 1970’s.
On a much larger scale, LED technology has been used for many years on outside advertising displays, typically seen at sports stadia or on the ‘strip’ in Las Vegas.
Over the last few months, several manufacturers have introduced new ranges of LED technology based TVs. These manufacturers include Samsung, Sharp, Sony and LG.
LCD (Liquid Crystal Display) TV’s depend on fluorescent ‘backlight’ tubes to produce light that passes through the LCD Panel to produce the image. Light leaking through these LCD panels, can in some instances reduce the contrast ratio, between absolute black and absolute white. Typically black portions of an image produced by an LCD screen can actually be dark grey.
Plasma screens always offered better contrast than LCD, however Plasma technology is power hungry, produces heat and is relatively bulky.
Due to the absolute white versus absolute black levels (Contrast Ratio) of an LED screen being so much higher than other technologies, the image clarity is significantly better than LCD or Plasma TVs. An indication of the depth and purity of the black levels produced by this new LED technology can be seen from the manufacturers ‘claimed’ contrast ratios. LED TV’s will claim a contrast ratio of around 500,000:1 rather than a figure closer to 25,000:1 for traditional LCD TVs.
New LED TVs from Samsung, Sharp, Sony and LG are significantly thinner than LCD TVs currently on offer.
LED TVs consume much less power than even an LCD TV; About 35~40% less compared to a similar sized screen.
LED TVs offer a greatly expanded range of colours, particularly when RGB-LED backlighting is used. Not all LED TVs have additional LED backlighting, please check with your supplier or the TV manufacturer. RGB-LED Backlighting can produced brighter and clearer images than those not using this back-lighting technology.
LED TVs offer a faster screen refresh rate than LCD or Plasma screens. This eliminates the smearing of images when an object such as a football moves quickly across the screen. This was an issue with earlier LCD and Plasma TVs, however later versions were much better.
Ultimately, LED TV’s produce sharper on screen images with a greater range of colours, faster response times along with superior contrast ratios. It is also claimed by the LED screen manufacturers, that metals such as Lead are not used during the product’s manufacture, hence it is likely that LED screens may be more environmentally friendly.
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