LCD TVs have been around for a long time. The technology of their production is constantly being improved, the sizes of screens are increasing more and more. But if earlier in the production of LCD matrices LCD technology was used, now an increasing share of the market is occupied by TVs with LED screens.
A feature of liquid crystal screens is that they need a backlight to work - that is, a light source located on the back side. If there is no backlight, nothing can be seen on the screen. Sometimes the light source fails - in this case, the screen is dark, but if you shine a flashlight on it, you can see a faint image.
LCD-backlit TVs use special fluorescent lamps, which in their principle of operation are no different from ordinary fluorescent lamps. And they have the same disadvantages - such a lamp can burn out, which will require its replacement. Another inherent disadvantage of screens backlit by fluorescent lamps is uneven illumination - manufacturers cannot achieve absolutely uniform illumination of the entire screen area. True, this is usually not very noticeable by eye, but an experienced person can distinguish uneven illumination.
That is why LED technology has replaced LCD backlighting. When using it, the backlight of the liquid crystal matrix is carried out using LEDs. The advantages of this technology can hardly be overestimated, among the main ones are uniform illumination, low power consumption and a very high resource of work. A TV with an LED screen is more likely to be sent for recycling due to obsolescence than due to a malfunction of the backlight. Such a screen does not have the high voltage required for a traditional LCD backlight, which greatly simplifies its design.
Of course, LED technology has its drawbacks as well. More precisely, the disadvantage is the higher cost of such screens. LEDs are still quite expensive to manufacture, but new technology is gradually replacing the old one. TVs based on it are much more reliable, more economical, have better image quality, which pushes manufacturers to a complete transition to LEDs.
LED technology is also moving forward. If at first we used side lighting with white LEDs, now there are screens with LEDs of three colors - red, blue and green (RGB-backlighting). They are located behind the screen and turn on at the right time in accordance with the color of the image. The image on such a TV is very bright and juicy.
