Does a LED-backlit LCD TV is also a LED TV?
As the title of this article raise a question whether a LED-backlit LCD TV is called a LED TV too? well we will answer it at the later part of this article but before that we need to understand the overview of the LCD TV and why we can answer it because we are experts in repairing any kind of TV manufactured by any brand. Right now our services are available in Kolkata and Howrah city. So, lets move to the topic of this article.
What is LCD TV?
LCD stands for liquid crystal display as the name suggest LCD TV screen is made up of two sheets of polarizing material enclosing a liquid crystal solution in-between them. Once a electric current is passed through the solution it causes the crystals present in the solution to align themselves so light can and cannot pass through them as per the requirement.
Behind these sheets CCFL(Cold Cathode fluorescent lamps) are used to provide backlighting. These CCFLs are placed across the space behind the LCD display to illuminate the crystals present in-between the two sheets of polarizing material.
What is LED TV?
LED stands for light emitting diode and LED TV uses LEDs for backlighting instead of CCFLs used in LCD TV but both LCD and LED TV uses the same display that is made up of two sheets of polarizing sheets holding a liquid crystal solution in-between them as mentioned before, difference is there in the backlighting. Hence LED TV is actually a LED-backlit LCD TV. Yes you are reading right actually LED TV and LED-backlit LCD TV are both same.
Advantages of LED over CCFL backlighting
LED backlighting takes less space than CCFL backlighting as the size of LEDs are smaller than CCFLs hence LED TVs are more slimmer than LCD TVs. LEDs are more energy efficient means it uses less electrical energy than CCFLs. LED TV can use combinations of RGB(red green blue) LEDs to illuminate the crystals which create more accurate colors of the picture than CCFLs.
CCFL backlighting is an older form and it almost abandoned but some manufactures may use it to create lower end models as these are cheaper than LEDs. CCFL illuminates crystals evenly means all regions of the picture will have similar brightness levels. This affects some aspects of picture quality because crystals present in LCD display can’t stop lights from CCFLs completely, whenever there is a need to do in the picture to show darker places or complete black things this is generally achieved by dimming the LEDs so that Crystals can stop it to pass through the screen which cannot be achieved using CCFLs.
Types of LED backlighting.
Edge lighting: This technology uses lesser number of LEDs for backlighting and are generally used in cheap LED screens. Here LEDs are placed at the edges of the space behind the display. This can be including LEDs along just the bottom; LEDs on the top and bottom; LEDs left and right; and LEDs along all four edges. These different placements causes difference in picture quality but the overall brightness still will be better than CCFLs.
Manufacturers like Sony and Samsung have developed their own advanced forms of edge lighting. Sony’s technology is called as “Slim Backlight Master Drive,” while Samsung has employed “Infinite Array” in its line of QLED TVs. These enable them to make more slimmer LED TVs.
Full array backlighting: Here an array of LEDs are placed at the back of the LCD screen, with groups of LEDs that can be lit or dimmed in a process called local dimming for achieving better color accuracy than CCFLs. These patterns of backlighting are used in the higher end models of LED TV. Plus, they’re less of a power drain than CCFL were.
October 30, 2018
February 14, 2020
February 14, 2020