The term LED TV is grossly misunderstood. It is often thought that it is the LED that produces the image in Led TV, whereas the truth is that the LEDs are used to backlit LCDS in the TV which produce the image. LEDs are used in place of fluorescent light in a LCD TV.
One type of LED backlighting is called Edge lighting. Here, a series of LED backlights are placed along the outside edges of the screen. The light then gets dispersed across the screen. One advantage of this configuration is that the TV can be very thin. The disadvantage is that the black levels are less deep and edge area appears brighter than centre area.
HD LED TV
The other type of lighting is the Full Array lighting. In this system, several rows of LEDs are placed at the back of the entire surface of the screen. The advantage here is that a specific group of LEDs can be list or turned off within a specific area of the screen enabling brightness or darkness control of that area. We can call this local dimming. The disadvantage is that such TVs are thicker in dimension.
LEDs are designed differently than standard fluorescent backlight system. Following differences arise with LED lit LCD TVs.
• Lower power consumption.
• Unlike some LCD backlit systems, no mercury is used.
• Color saturation is more balanced.
• In LED TVs using full array backlit method, no light leaks in dark scenes. It makes better black levels than the LED edge lit LCD TVs.
• LED TVs using edge back lit technique are thinner than standard LCD or full array LED TVs.
Incidentally true Led only TVs are seen only in stadiums or in large locations.
If you consider purchasing a LED TV, it is important to make an enquiry about which brand and models are presently using the Edge or the full Array methods. Make your own judgment about which of the two types look best to you. In many ways, selection of the two types is a matter of personal choice.
As said before, when we talk of LED TVs, we are actually referring to LCD TVs with LEDs being used as backlights. New technologies are constantly being evolved and recently Organic Light Emitting Diode or OLED is found to be a better substitute for LCD though it has been slow to be used on a commercial scale. OLED does not require a backlight. It can therefore offer greater contrast, less motion blur and lower power consumption than LCD.
The OLED technology is used for small surface applications like digital cameras and mobile phones. At present, OLED TVs up to 20 inch screen only are available in limited quantities. However, 40 inch models have made their appearance in Trade shows only and should appear in the market only after a few years. LED TVs have their plus and minus points depending on the positioning of the LEDS. With a bit of research and knowledge of the functioning of HD LED TVs, you can certainly make a well informed decision.
