What is an LED TV: backlight features, comparative characteristics, prices

LED TV: features

An LED TV is a thin TV with a liquid crystal display, which differs from other models in a certain type of backlight, which uses LEDs to transmit images. This system is called Light Emitting Diode (LED).

LED TVs differ from other models in that they have become visually thinner and safer, since they no longer use mercury in their production. The quality of the picture has increased significantly, the depth and saturation of colors, as well as detail, have appeared.

How does LED work?

Previously, TVs used fluorescent lamps, which produced lower brightness, dull colors and grainy pictures. LED TVs operate using LEDs, which allows them to achieve increased brightness and good luminosity.

The very principle of operation of LEDs is based on highlighting certain areas that the picture requires. If there are dark places in the picture, the LEDs turn off or “go out,” which ultimately saves a sufficient amount of energy. It is LED technology that provides rich, deep black color, which analogue TVs could not previously provide.

The advantages of LED backlighting include the following:

The thin body of the TV is due to LED backlighting, where each diode is no more than 5 mm in size, in contrast to more outdated fluorescent lamps - 10 mm.
Picture quality – brightness, black color saturation and detail increase. LEDs can turn off at the right moment in the picture, which significantly enhances contrast and increases the richness of all colors.
Energy saving up to 40%
Additional features – LED TVs provide access to various additional features in the form of Skype conversations and quick “surfing” on the Internet.

Interesting Facts.

LED Strip Light.

Getting white color. There are three options. The first is based on RGB technology. Including all three colors 100% produces white. In the second case, three phosphors are applied to the lens: blue, red and green. The third option is to apply red and green phosphor to the optical system of the blue LED.

Work at elevated temperatures. As the temperature in the region of the pn junction increases, the brightness of the glow decreases. Moreover, red and yellow ones have a greater drop in brightness than blue and green ones. Therefore, you need to use a good heat sink and prevent LED operation at elevated temperatures.

How are semiconductors prepared? Mainly using the technology of metal-organic epitaxy in an atmosphere of highly pure gases. Films with thicknesses ranging from angstroms to microns are grown. Different layers are doped with impurities that will give the layer a high concentration of electrons or holes, that is, they will form an n or p structure of the semiconductor. Why are films etched, contacts are created to the n and p layers and divided into chips of the required sizes.

What is good about SOV technology? The fact that the crystals are mounted on a metal substrate, which simultaneously serves as a radiator. In this way, excellent heat dissipation is obtained directly from the semiconductor crystal. Additionally, you can get different LED shapes, different flexibility, etc.

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Methods (types) of LED backlighting

There are two types of LED backlighting:

White (WLED)
– white light-emitting LED.
Three-color (RGB)
- the use of LEDs in three primary colors: red, green and blue.

Differences in design and layout of LEDs:

Edge LED
is an edge or side circuit, where LEDs can be located along the edge of the matrix (perimeter) and turn on alternately, depending on the transmitted picture. This is a cheaper type of LED design, due to the reduction in the number of diodes, which also affects the thickness of the TV, which becomes much thinner.
Direct LED
- a matrix arrangement of LEDs distributes them across the entire screen and this is what makes it possible to regulate the selective switching off of the diodes in the place of the picture where there should be dimming. The contrast of the picture increases by several points, the richness of colors and the depth of black increase. The Direct LED circuit will cost an order of magnitude more than the one described above.

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Shivaki

Models from this manufacturer have proven themselves well; they work reliably for a long time. If you are interested in this brand, pay attention to this option:

Model name: Shivaki STV-48LED15;
price: 24,000 rubles;
characteristics: black, screen diagonal - 48 inches (121 cm), refresh rate - 50 Hz, resolution 1920x1080 dpi, video in Full HD format, sound power - 16 W, four digital tuners, 3 HDMI ports, 1 USB connector for viewing multimedia files from external media, has a recording function, child lock option, weight – 11.5 kg;
pros: fits well into any design, can be placed on a shelf or mounted on a wall, reasonable cost, high-quality image;
cons: no Smart TV, Wi-Fi, 3D capabilities, surround sound, few functions, poor response to the remote control, inconvenient menu.

TCL

This company has a lot of TV options: plasma, LCD, LED. They are distinguished by good quality and affordable prices. You may be interested in the following option, budget but worthy:

Model name: TCL LED32D2930;
price: 14500 rub.;
characteristics: diagonal 32 inches (81.3 cm), resolution 1366x768 Pixels, brightness 240 cd/sq. m, 16:9 format, progressive scan, 60 Hz refresh rate, Smart TV, timers, child lock, teletext, program guide, 2 built-in speakers, stereo sound power 10 W, surround sound, Wi-Fi? connectors – component, 3 HDMI, PC input, coaxial audio output, 1 USB, black;
pros: cheap, can be hung on the wall or put on display, good picture and sound quality, bright colors;
Cons: too fragile, cannot be used instead of a monitor.

Samsung

The company's products include a huge number of LED TVs. Nowadays this one is especially popular:

Model name: Samsung UE40MU6100UXRU;
price: 36,000 rub.;
characteristics: diagonal 40 inches (101.6 cm), Edge LED backlight, 16:9 format, Ultra HD, resolution 3840x2160 pixels, HDR support, Smart TV, voice control, timers, program list, channel name entry, protection from children, Russian menu, program guide, teletext, digital noise reduction, comb filter, image and sound enhancement technologies, decoder with automatic and manual settings, 2 built-in speakers, sound power 20 W, 3 HDMI connectors, 2 USB ports, Wi- Fi, Bluetooth;
pros: natural colors, stylish design, the remote control is universal and controls all devices connected to the LED TV, connects to a mobile device, excellent picture quality;
cons: slows down when playing very large files.

LG

All LED TVs from this company are distinguished by high quality, durability and attractive modern design. This option will fit perfectly into a stylish interior:

model name: Ultra HD (4K) LG 43UH619V;
price: 32,000 rub.;
characteristics: white, diagonal 43 inches (109.2 cm), Direct LED backlight, 16:9 format, Ultra HD available, resolution 3849x2160 pixels, progressive scan, anti-glare coating, Smart TV, input of channel names, child lock, menu Russified, teletext, program guide, Plug&Play function, dynamic scene index, digital noise reduction, comb filter, 2 built-in speakers, sound power 10 W, surround sound, 3 HDMI ports, 1 USB connector, Wi-Fi;
pros: good image detail, detailed clear instructions, loud and clear sound, a lot of useful functions and modes;
disadvantages: there is distortion of the picture when viewed from different angles, few applications, you often need to adjust the screen format to different types of files, inconvenient mounting on the wall.

Mystery

Among the wide range of this manufacturer there are a lot of inexpensive and high-quality models. Pay attention to this option:

model name: Mystery MTV-4030LT2;
price: 18,000 rub.;
characteristics: diagonal 40 inches (101.6 cm), Direct LED backlight, 16:9 format, Full HD, resolution 1920x1080 pixels, progressive scan, refresh rate 60 Hz, timers, clock, input of channel names, program list, protection against children, freeze frame, Russian menu, blue screen, shutdown when there is no signal, teletext, program guide, built-in radio, digital noise reduction, 2 tuners, 2 built-in speakers, power 20 W, 3 HDMI connectors, 1 USB port;
pros: affordable price, convenient menu;
cons: not very saturated colors, insensitive remote control, no Wi-Fi, poor sound.