1. LED TVs are simple
LED TVs are nothing more than thousands of tiny LEDs (Light Emitting Diode) that can emit different kinds of colors. LEDs are common electronic components, which are usually used as indicator lights, like “Power On” indicator light on your PC. However, LEDs on TV are much smaller and more sophisticated.
2. There are two types of LED TV
There are two variants of LED TV: Edge LED and Full-array LED.
On Edge LED TVs, white LEDs are located on the periphery of the screen. A special panel (diffuser) distributes the light emitted by these LEDs evenly on the LCD. If you look closely, darker colors on Edge LED TVs may not be deep enough, the screen edges are brighter than the center. To illuminate the screen more evenly, LEDs on the center are working more intensively, leading to higher energy consumption than full-array LED TVs.
On Full-array LED, white LEDs are located behind the whole LCD panel. As the result, these diodes can work less, because the whole panel is already better illuminated.
A variant of white LEDs is called the RGB LEDs. These LEDs use red, green and blue to reflect a variety of colors. Strange as it may seem, the combination of red, green and blue on these LEDs creates a white light.
3. LED televisions are economical and environmentally-friendly
The LEDs used for illuminating the display are more economical than the conventional backlight. They are extremely efficient and produce more light per watt than a traditional incandescent lamp. For very dark colors, LEDs can be (almost) completely extinguished. This result in 40% energy savings compared to conventional LCD TVs. In addition, LEDs contain no mercury, unlike CCFL lamps. If all televisions in the world are replaced with LED TVs, hundreds of GigaWatts can be saved.
4. TVs LEDs offer better image quality and sharpness
By turning on or off the LED locally, you can increase the contrast and create deeper colors. The contrast ratio mentioned by manufacturers on LED TVs gives an indication of the color depth. The contrast ratio is defined as the difference between brightest white and the darkest black on the screen. LEDs can also react faster to changes than other types of TVs. The blurring effects that appear when there are fast moving images, like in sports programs, are therefore greatly reduced.
5. LED TVs have better viewing angle
On conventional LCD TVs, the contrast decreases as the viewing angle increases, it is a major flaw on these TVs despite major efforts to correct it. With LED technology, the viewing angle of an LCD TV is almost equal to that of a plasma screen.
6. LED televisions are thinner
LEDs also take up less space than fluorescent tubes, which can reduce the thickness of televisions. This is especially the case with the Edge LED TVs.
7. LED TVs are still expensive
For now, the LED televisions are still more expensive than LCD TVs or plasma displays.
8. LED TVs do not offer better quality than plasma TVs
LCD TVs have caught up rapidly with the level of plasma TVs. However, LED TVs does not surpass plasma TVs on color depth and vibrant colors. Furthermore, plasma televisions have recently become significantly cheaper.
9. Why we don’t have more LEDs on LED TV?
HDTV resolution is 1920 x 1080 pixels. Ideally, each pixel should have its own light source. On LED TVs, ideally one LED represents one pixel. But current LEDs are not small enough to illuminate all pixels individually, currently, a group of LEDs illuminate certain area on the screen.