If you can remember the TVs of early 80âs, they were bulky and heavy pieces of machinery. Very few of them offered color display. In late nineties, the trend for flat screen television started. Today, market is flooded with loads of television models. You have options to buy color TV with big bulky cathode tubes, LCD TV, Plasma TV and the newer LED TV models. The Bulky TV had Cathode tubes to sprinkle electrons over a screen to project the image. However, the new TV is thin, light and slim. Users can easily mount a LED TV on wall. LED TV is one such innovation that has revolutionized the flat wall mounted Televisions.
How does a LED TV work:
Before understanding the concept of LED TV, you need to understand the basics of televisions. In early cathode tube based TV, screen was bombarded with electrons. The scintillations are controlled to form images by the incoming signal pattern. LCD TV is the first major modification of cathode ray based TV. The screen is replaced by liquid crystals trapped between two glass sheets. The electron spraying mechanism is replaced by series of Cold Cathode Fluorescent Lamps (CCFL). LED TV is just a modified LCD TV, where the screen is still LCD based. However, the CCFL are replaced by thin series of LED lights. The LED lights have lowered the TV thickness. The LED TV boasts of great dynamic contrast too.
Coloring Mechanism:
The coloring mechanism of LED TV is based on either Edge LEDs or RGB Dynamic.
1. RGB Dynamic
RGB Dynamic has a very high contrast which makes it very bright for viewing colored images. RGB dynamic is based on a sequence of red, blue and green LED lights behind the screen. When a light colored image is projected, the image containing region glows brighter, but with less colors. The outer regions become less brighter, but with increased colors. The mechanism increases the contrast significantly to produce sharper and brighter images.
2. Edge LED
The Edge mechanism has white LEDs at the edges. There is a light diffusing panel just behind the screen. The panel compensates the light coming from the central LED series to equalize the light distribution. The image is not that much bright as RGB dynamic. However, the technology is quite efficient in terms of power consumption and material cost. The LED TVs with Edge technology are the thinnest LCD TV available in the market.
The technology is not cheap as LCD screen is a necessity in both LCD and LED TVs. However, people are expecting a rapid price drop due to increase in recent development of LED technology.
Advantages:
There are several advantages of LED TV, which include better contrast, better screen viewing, lighter weight and low power consumption.
Disadvantages:
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LED TV also has its dark side. They cannot offer detailed imaging of smaller objects that means the night sky will always be black even if it is star studded.
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It is not very well suited for low light viewing like Plasma TVs.
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The LED TV can be a better option than LCD TV, but, currently, it is very costly.
