Why LED TV …
Posted by Debjit Biswas at 11:45 AM
LED TV-Redefining viewership
LED TV is the latest television model which has been introduced in the market already flooded with other high-definition television sets. There is immense curiosity about this newly launched product and consumers are keen to find out its special features that set it apart from the others.
LED (Light Emitting Diode) TV is actually a LCD TV made up of liquid crystals but comes with a different kind of backlighting. Instead of Cold Cathode Fluorescent Lamps (CFFL), which is used in a LCD TV, LED backlights are used.
The CFFLs used in LCDs are quite similar to the lamps used at home. They light up the LCD screen which is made up of pixels. Individual pixel either allows the light to show white or blocks it to show black. Each pixel has 3 sub pixels like red, green and blue which bring out the colour. But the product suffers from light leakage; the backlight cannot be fully obstructed in dark regions of the screen. As a result the dark regions of the screen are not dark enough.
But the LED TV is more effective in reducing the light leakage. There are two types of LED TV – RGB LED and Edge LED. The RGB LED TV allows local dimming. A backlight local dimming algorithm is applied to achieve high static contrast. Static contrast means the contrast between the maximal and minimal pixel brightness in the same frame. Backlight local dimming system reduces the light leakage which gives excellent on-screen contrast. The technology is such that The LEDs can be dimmed in different regions of the screen simultaneously. RGB LED TV also provides a wider colour gamut.
On the other hand the Edge LED lighting produces TV sets which are slimmer than LCDs since backlights are placed along the edge of the screen. Moreover LEDs consume less power than LCDs.
