Over the past 2 decades, manufacturers of new TVs have been striving to achieve the very perfection that can surprise and delight the eye of any TV viewer. This zeal has given rise to many screen technologies such as CRT (picture tube), LCD (LCD technology using powerful lamp to illuminate the image), plasma panels (a matrix that has millions of bubble-pixels filled with inert gases) and, finally, LED TVs (light-imitating diodes). People spend a lot of time watching it and often have no complaints about the image quality. The picture is always with good resolution and additional elements expanding video display standards. LED TV - what is it? This question is often asked by users on various forums. The answer is simple, as always. LCD device that uses LED LED backlight. At the end of 2016, she gained immense popularity, proved herself well and developed in several directions. Of course, a good LED TV is an essential attribute of any home. Actually, this development is the leader in electronics.

LED backlighting - what is it?

The abbreviation stands for Light Emitting Diode and translates as "a diode that emits light." In fact, this is an LCD device, which, after the use of such a backlight, became known as an LED TV. In both versions, a liquid crystal screen is used, but in the second, diode backlighting adds brightness and contrast to the picture, which led to the name change.

So, what is LED backlighting? Due to the fact that in LCD models the screen backlight is lamp-based, and they are large enough, the thickness of the case is large. Another disadvantage of lamp backlighting is the pale color gamut on the LCD screen, since the light is scattered over the entire area of ​​the matrix and does not emphasize individual image details. At the same time, an LED TV is capable of illuminating separate areas of the screen to varying degrees at the same time and significantly reducing the thickness of the case. Screens of this type serve for a very long time, in contrast to plasma panels, which tend to fade from direct sunlight. The pricing policy of LED TVs pleases consumers, because an LCD display is much cheaper than plasma. The LED backlight technology has several variations that improve the picture quality to one degree or another.

Short video will show clearly:

Edge LED technology

This modification is a linear arrangement of diodes along the edges of the LED TV screen. Diodes white form a kind of frame that evenly illuminates the image. As a result, a rather lively picture is obtained, which compensates for the disadvantages of a low-quality image.

Pros:

• Slim body. When asked what an LED TV is - this is the first characteristic. It is achieved due to the arrangement of diodes at the edges of the matrix, and not behind it;
• Low power consumption. An insignificant number of diodes and their monochromaticity allow you to save on power supply;
• Durability of service life;
• Dynamic contrast change. The backlight quickly reacts to changes in brightness and color gamut;
• Increased viewing angle;

Minuses:

1. Weak intensity of color shading in the required volume;
2. LED TVs are equipped with such backlighting only with a small screen diagonal;

Direct LED technology

The device consists of a grid of diodes three colors: blue, green, red. The LED backlight is located directly behind the screen matrix. Thanks to the use of multi-colored diodes, maximum contrast is achieved, since each mesh element can change color independently of the others. These are the most popular LED TVs on the market. Color adjustment takes place in hardware, thanks to the built-in processor, which reads the digital stream of the image at lightning speed and enhances its colors using backlighting (Local Dimming).

Pros:

• Good dynamism of dimming the required areas of the screen;
• Increased picture contrast;
• Does not lose its properties over the years;
• Direct screen LED backlit minimally affects human vision;

Minuses:

1. Increased power consumption;
2. Increased body thickness;

New OLED technology

We can say that this is a breakthrough in this area. The grid structure consists of organic diodes, which are covered with a special phosphor emulsion different color... Such diodes glow due to the electrical impulse that passes through them. These diode elements are much smaller than usual, which allows you to maintain the thinness of the OLED TV screen when the grid is located behind the matrix. The range of color shades is wide enough to cover maximum amount changes in the contrast of the image.

Pros:

• Maximum black depth;
• Slim screen;
• High performance. The response of each diode is less than 0.002ms;
• Good viewing angle;

Minuses:

1. OLED LED TVs are quite expensive;

QLED Quantum Dot Illumination

The matrix of such TVs is equipped with a coating of quantum dots. This technology of the future, and the first to harness it, are Samsung engineers. This technique costs a lot. big money but worth it. Quantum dots illuminate an image as powerfully on a contrast scale as the human eye can see. Amazing performance, brilliant picture quality and durability put the QLED TV far beyond its siblings. But still, there is one drawback - not everyone can afford such a luxury.

Finally

TV-PROST specialists fully answered the question: LED TV - what does it mean? To determine the choice, you need to weigh several factors that ultimately lead you to correct decision... Each LED technology The highlighting presented in this article has its pros and cons. You can familiarize yourself with them and decide for yourself which of the errors you are ready to measure. Only one thing can be said for sure: LED TV is a significant breakthrough in the world of modern electronics. Successful purchase and comfortable viewing!

LED TVs have proven themselves well and gained wide popularity. Price for given type TV sets are gradually declining and they are becoming more affordable. Not everyone understands exactly how LED TVs differ from other types of TVs. In this article we will answer the question of what a LED TV is, we will understand the principle of its operation, we will discuss the pros and cons associated with the production technology.

TV and LED lighting

An LED TV is a liquid crystal TV that uses LEDs to illuminate the screen. Recall that in the already familiar LCD TVs, cold cathode lamps are used for backlighting. What are the advantages of using in the backlight LED matrix? According to manufacturers, one of the main advantages of using diodes can be considered a significant increase in image quality. There are several parameters that directly affect the viewer's perception of the image. These include the level of contrast, brightness, color quality and black depth. In most cases, LED TVs outperform LCD counterparts with standard lamps in all of the above parameters. What is the reason for this?

This situation results from design features LED matrix. By adjusting the level of the glow of the diodes, you can achieve full control over the dimming or lightening of local areas of the TV screen. An off LED does not create any glow, so a group of off diodes can create completely black areas. This technology achieves excellent contrast levels and deep blacks. The overall color rendition is also improved, resulting in improved image quality. Because LEDs are bright, LED TVs have high screen brightness, making it comfortable to watch TV in bright rooms. Thus, the use of a diode matrix can improve most of the parameters responsible for the output of a high-quality image. The pluses include a significant reduction in power consumption - in general, 40% lower than standard LCD TVs of the same size.

It is worth mentioning that mercury and harmful aerosols are not used in the production of LED TVs. Which has a beneficial effect on environmental safety. An interesting fact is that in LED backlighting, it is possible to use both single-color and three-color diodes (red, blue and green). In the case of using three-color diodes, you can increase the number of displayed colors. The price is minor problems with natural display of colors, so mainly LED backlighting with white diodes is used.

What methods are used in LEDbacklight

In order to improve the quality of the displayed image, the manufacturer began to use the local dimming technology, which is responsible for local dimming. According to the technology, it is accepted to control LEDs in groups, which consist of several separate diodes. In addition to all the advantages described earlier, this technology also has disadvantages. There may be cases where the displayed image has poor color uniformity. This is when you can see bright spots in areas with brightly turned on backlighting, and dark spots in areas with off backlighting.

Contrasting transitions in images often cause color halos, which negatively affect viewing comfort. Finally, in too dark areas or in dark scenes, you can lose small parts that will simply not be visible. All these problematic points are difficult to determine when viewing a normal picture on a TV. That is why local dimming technology is very common and is used in LED TVs with LED backlight.

LEDs in LED TVs are located unevenly. There are two main methods of diode placement: Direct and Edge. In the first case, the LEDs are evenly placed behind the TV screen. This allows for uniform diode illumination of the entire screen. However, this increases both the thickness of the screen and the power consumption. In the second case, all LEDs are placed only around the perimeter of the TV screen. Effective application of local dimming technology becomes impossible. But the thickness of the TV is significantly reduced. The thinnest TVs can only be produced with Edge diodes. In most cases, LED TVs use Edge backlighting using local dimming.

conclusions

It should be understood that the type of backlight used does not always have a critical impact on image quality. A huge role is played by the image processing technologies and the type of GPU embedded in the TV. Most of the major TV manufacturers have their own unique technologies that have no analogues. This is how the struggle for customers is going on in the competitive TV market. We hope that the information provided has helped you to understand what an LED TV is and with the features of LED backlighting.

Today, many people strive to improve their home, fill it beautiful furniture, exquisite accessories and modern innovative technology... The latest generation innovation is a modern LED TV. What this means, not everyone knows. It has a display backlit by innovative LEDs. They create bright radiation when they pass through the device. electric current... As a result, the user can watch high-quality, most clear and vivid cartoons, various films and television programs at home.

Latest generation LED technology

Its main difference from LCD displays is the principle of backlighting the screen. Currently, the most common two types are lateral and posterior. The first type is used in cheaper and simple models household appliances, while the second is in expensive functional devices. The back OLED backlight is a colored element installed behind the plasma panel. LEDs take on a certain shade, depending on the color of the picture. As a result of this effect, a person can view three-dimensional and realistic films.

LED technology allows you to achieve high contrast and brightness on the screen with an immersive effect. This feature distinguishes this device from many similar models. As a result, a person can enjoy watching films, cartoons and documentaries in high definition and quality.

You want to know what an LED TV is. This is a device that has a number of advantages:

• Small thickness of the screen, which makes it easy to hang the device on the wall;
• Highest contrast and clarity of the transmitted image;
• LED lamps can reduce energy consumption by 40 percent;
• No mercury in the display structure;
• High functionality. Many modern devices have many special connectors and interfaces for connecting a computer and other digital equipment.

Many buyers are faced with a choice high-quality technology are faced with the question of what an LED TV is and how it differs from similar models. Its main advantage is its innovative LED backlighting. Diodes make it possible to improve the quality of the image on the screen, as well as increase contrast, brightness, color rendition and dark color depth. These are devices the latest generation, therefore, they are significantly ahead of technical equipment all their predecessors.

In this way, the best choice is an LED TV. What does this mean for the buyer? Saving electrical energy, functionality, aesthetics and environmental friendliness, since mercury and others are not used in the production of the matrix for this product hazardous substances... The diodes in the display are staggered, resulting in more uniform backlighting.

What are OLED TVs?

Currently, OLED is another novelty on the home appliance market. plasma TVs... What is this functional device, not everyone knows. It has an even thinner display, which sets it apart from many similar models. As a result, the appliances will perfectly fit into any corner of the apartment - a small bedroom or living room, and will also become a natural extension of the wall.

The screen of this innovative multimedia device includes three layers, one of which is a special film. Each pixel in it has unusual design with built-in organic light-emitting diodes. When an electric current passes through them, they themselves emit a bright glow. As a result, this design eliminates the need to install a backlight in the screen, which makes it possible to reduce the thickness of the display.

V Lately OLED TVs have gained widespread popularity. What does this mean for the buyer? Maximum contrast, wide viewing angle, no glare on the screen, low weight, low energy consumption, no need to install additional lighting, and fast response. These advantages make the appliance the best choice for those who prefer quality and functionality.

In today's article we will introduce you to LED TVs. In short, these are thinner and higher quality TVs compared to the usual ones, which I wrote about earlier. So...

First, let's define what kind of technology it is - LED

Samsung Electronics is the first company to introduce LED TV. And accordingly, most other manufacturers of LCD TVs began to produce TVs with this technology. The technology itself LED - this is a more modern and high-quality backlight (LED backlight). Therefore, LCD TVs with this technology are usually called LED LCD TV or simply - LED TV ... Sometimes there is another name for LED-backlit LCD.

LED TV or CCFL LCD TV. What's better?

...

Earlier, we have already indicated that LED is new type backlight, and what was the old one you ask, and the old one is CCFL (Cold Cathode Fluorescent Lamps), in other words - lamps daylight... And from here emerge the reasons why it was necessary to look for new types of backlighting:

1. It is difficult to implement deep black tones - constantly on lamps still give a little translucency. Due to this, the clarity of the picture is reduced.

2. Many color shades disappear, so it is very difficult to achieve a more or less good color gamut.

3. Limited lamp life

4. Difficulty in achieving high frequencies sweep.

5. Difficulty in disposal, since mercury is used in the structure of fluorescent lamps.

In a word, one way or another, but the need to replace fluorescent lamps with something more efficient has matured long ago, and as a result of numerous experiments, the choice fell on LED backlighting. It can improve at least four key image quality factors: brightness, contrast, image clarity and color range... Not to mention the more uniform nature of such backlighting, which is important when viewing poorly lit scenes with initially low contrast. In addition to this, it is also worth mentioning that the economy of LEDs and longer runtime without loss of performance can significantly reduce the power consumption of LED TVs compared to.

Types of LED backlighting

A number of different technologies backlighting LCD screens using LEDs. As a rule, to create backlight units (Back Light Unit, BLU), LED arrays are used, made up of white (White) or multi-colored - RGB (Red, Green, Blue; red, green, blue) LEDs.

The backlighting principle is also represented by two main options - direct (Direct) and end (Edge). In the first case, it is an array of LEDs located behind the LCD panel. Another method that allows you to create ultra-thin displays is called Edge-LED and involves placing backlight LEDs around the perimeter of the inner panel frame, and even distribution of the backlight is carried out using a special diffusion panel located behind the LCD screen - as is done in mobile devices.

Direct LED backlighting advocates promise better results with more LEDs and local dimming technology to reduce smear. back side direct backlighting - more LEDs and a concomitant increase in energy consumption and price. In addition, you will have to forget about the ultra-thin design of the TV. Backlit proponents, besides saving energy, promise better quality with a slimmer design.

Today, many world companies are engaged in the production of LCD TVs with LED backlighting, including Samsung Electronics, Toshiba, Philips, LG Electronics, Sony and others. Each company uses variations of the above technologies in their LCD TVs and LED backlit monitors. For example, Sony TVs use the technology Edge LED, which made it possible to significantly reduce the thickness of large enough TVs.

Because Samsung Electronics has pioneered a new page in the history of LCD TVs, further review will be based on this company's TV.

The principle of operation of LED-backlight

In essence, an LCD screen is a multi-layer "cake" made up of color filters, arrays of liquid crystals, backlight lamps, etc. The cells of liquid crystals do not glow by themselves, but, depending on the level of voltage applied to them, they open to transmit light completely, partially open or just closed in case of displaying a dark area of ​​the picture.

The role of backlight lamps is to illuminate the slightly opened LCD cells so that the final picture is obtained on the screen. Despite such a simplified retelling of the principle of operation of the LCD, this is quite enough to understand the purpose of its main components.

The thickness of the layers of the "pie" of different LCD screens is different. In the case of traditional fluorescent lamps, the backlight layer is so thick that it takes up more volume than all the other layers combined. The total thickness of such a TV reaches 12 cm.

Replace fluorescent lamps backlighting of LCD cells on LEDs. The first obvious effect of this replacement is a significant reduction in the overall thickness of the LCD panel. Moreover, in Samsung LED TVs, LEDs are placed not behind the matrix, but along its edges, due to which the presence of such an end layer practically does not in any way affect the total thickness, but it significantly decreases total weight... The total thickness of such a TV reaches 3 cm.

The light guide layer LED BLU provides uniform illumination in all areas of the screen. Thanks to a special reflective grille, the light transmission efficiency of the LED Samsung TVs claimed to be 20% higher than direct RGB LED models.

For reference: Samsung 8000 series LED TVs use 324 LEDs for backlighting. Due to the complete rejection of fluorescent lamps, LED TVs do not contain a single gram of mercury. Samsung technology, in addition to this, has also managed to completely eliminate soldering using lead compounds, and practically reduce emissions of volatile organics and other harmful by-products by eliminating spray powder paints - a thin, durable and attractive case of new TVs is made according to special technology Casting Crystal Design.

Contrast and brightness of LED TVs

Another significant advantage of LED TVs is high level image contrast, significantly overlapping best performance traditional LCD matrices. The brightness of the LEDs is so great that, for example, in Samsung LED TVs of the 6000, 7000 and 8000 series, the contrast ratio reaches 1,000,000: 1. In addition, digital signal processing with Mega Dynamic Contrast technology provides detailed images in low-contrast “twilight” areas of the picture.

Maximum possibilities new system The backlight is squeezed out using a multi-layer Ultra Clear Panel filter that transmits light from the inside of the screen and does not reflect it from the outside, so it is possible to achieve the best brightness and contrast with a minimum of glare, regardless of whether the screen is illuminated outside - by sunlight or artificial electric lighting.

LED backlighting produces white backlighting of LCD cells, resulting in a wider and more natural gamut of color tones. Color palette LED TVs turn out to be juicier and richer, the greens and blues of bright areas no longer look faded and pale in comparison with conventional models.

Clarity LED TVs

Often the weak point of LCD screens is the blurring of the picture with a long response time, from which the sharpness of the image drops and the smoothness of the movement of objects in dynamic scenes. In the new Samsung LED TVs, this is monitored by the Motion Plus interpolation system: the 6000 and 7000 series models have double 100 Hz sweep, and the flagship 8000 series has a quadruple 200 Hz sweep.

Power consumption of LED TVs

Traditional LCD TVs, of course, are more economical than the old models with cathode-ray picture tubes, but do not forget that the diagonals are not the same now, so with large LCD TVs, electricity meters are spinning quite quickly now. As for the new LED models, LED backlighting can significantly reduce power consumption without sacrificing image brightness. Energy savings reduced by up to 40%. In the "STAND-BY" mode, the power consumption is about 0 W, in conventional LCDs - about 1 W

The TV is the most demanded household appliance. Almost every family has it, and even if it is not present at the moment, then it is probably in the plans to buy it. However, buyers always face the question of which model to choose, which is better, and how not to be mistaken? After all, on the shelves in stores there are a lot of different options, and even types of TVs - TFT, plasma, LCD, LED and so on. There are so many different names and abbreviations that you can just get confused. This article will discuss what an LED TV is.

Many buyers get lost in the selection process, seeing the big names LED, IPS, TN + Film and so on. However, this is all just a commercial move. So, in order to understand what LED is, you should disassemble the device and the principle of operation of a liquid crystal TV.

1. LCD matrix device

So what is a liquid crystal matrix? The technology of its work consists in the use of a special substance called liquid crystals. The substance got its name thanks to unique features... It simultaneously possesses optical properties similar to crystals, but at the same time it is liquid.

Another feature is that when a given substance is exposed to electricity, the molecules of liquid crystals change their position, thereby changing the refraction of light. Thus, with the help of electricity, you can control the polarization - the refraction of the visible spectrum of light radiation.

As you probably already guessed, the technology of the LCD matrix includes the need for an artificial light source, the radiation of which will pass through the liquid crystal molecules. The disadvantage of the first TFT TVs was that they used fluorescent lamps. However, they have relatively big sizes and insufficiently bright radiation.

1.1. LCD backlight

So we got to the question of what are LCD TVs. These are ordinary TVs with LCD matrices, but for the backlight they use new technology LED. As you may have guessed, this is an abbreviation that literally means the following - Lite-emitting diode. What the Russian translation says - a light-emitting diode.

Thus, it becomes clear that the answer to the question, what is LED LCD TVs is - these are ordinary TVs with liquid crystal matrices that have LED backlighting.

1.2. Benefits of LED backlighting

Now you know that the abbreviation LED only means backlight technology, which does not affect the screen resolution. Of course, thanks to the LEDs, the brightness and contrast of the image have significantly increased. This, in turn, had a positive effect on the accuracy of the picture.

In addition, LEDs consume much less energy, but at the same time emit significantly more bright light... This makes LED TVs less power consuming. Also, LEDs are smaller than fluorescent lamps, which allows them to be installed both along the edge of the matrix (along the entire perimeter) and on the back side (rear location). It is worth noting that this backlight technology made it possible to achieve more uniform screen illumination, which means better image quality - clearer and deeper colors.

2. Is it possible to use LCD LED TV as a monitor for a PC

Many buyers, when choosing LCD TVs, ask the question, can you use an LCD LED TV instead of a monitor? It is difficult to answer this question, since each model has unique characteristics... Only taking into account all the capabilities and indicators of a particular model can we say whether it can be used as a monitor or not.

It should be noted that modern technologies allow you to make inexpensive, but at the same time sufficiently high-quality matrices that have many possibilities. Every modern LCD LED TV can be connected to a computer and used instead of a monitor. However, not every model will produce the same good quality and image accuracy.

The fact is that liquid crystal matrices can have different resolutions. In order to use a TV instead of a monitor, it must have a high resolution(1920x1080 - Full HD). But such models are quite expensive. Of course, it is quite suitable and normal screen with HD resolution (1366x768). It should be borne in mind that the picture will be slightly stretched.

Of course, if you use a TV instead of a monitor to watch movies, then you can buy any model, since in the vast majority of cases, movies have a low resolution (HD - 1366x768). It should be understood that the higher the resolution, the better quality images. Therefore, when choosing a screen, you must take into account the characteristics of LCD LED TVs, and choose them depending on your requirements.

As a rule, any modern model has various connectors for connecting various equipment, such as:

• DVD player;
• Satellite receiver;
• Audio system (home theaters and so on);
• Memory drives (flash drives, mobile hard drives, and so on);
• Computers, laptops, tablets and smartphones, and more.

All this allows you to connect your laptop to the TV at any time and watch movies or photos. LCD LED TV technology allows you to display even small details, but it should be borne in mind that the larger the diagonal, the further you should be located from the screen.

3.How to choose LCD screen with LED backlight

Everyone understands that when choosing TVs, first of all, you need to look at the characteristics of the device. Of course, the image quality is mainly affected by the matrix, or rather the technology by which it is made. Today there are several types of matrices, but two types prevail on the domestic market:

• TN + Film.

Both have their own advantages and disadvantages. But they are insignificant, therefore, if the screen is bought for watching programs and films, then any option will suit you.

In addition, the backlight technology affects the image quality. Now that you know what LED LCD TV means, it is not difficult to make a choice, as LED backlighting has undeniable advantages. This means that LED-backlit matrices have best performance than conventional models with fluorescent lamps.

It should be understood that not all LED-backlit LCDs have the same parameters. They can also be different from each other. Therefore, when choosing, you should look at how the LEDs are installed and whether they can be seen glowing against a dark background.

4. Advantages of Samsung LED TVs: Video

5. Advantages of LCD TVs with LED backlight

Now you know what LED TVs are and their characteristics. Their clear advantages can be highlighted, the list of which includes the following:

• They can be used instead of a monitor;
• Deeper and more natural colors;
• High level of color saturation;
• High brightness and contrast;
• Higher definition of the image;
• Low power consumption.

With all these advantages, LEDs are low cost. This means that a good LCD TV with LED backlighting can be purchased for a lower cost. Moreover, it can be used instead of a monitor.

Now you know the answer to the question, LED TV, what it is, and how to choose it. Remember that technology does not stand still, every year new models of more modern and high-quality TVs appear, therefore, in order to make right choice when buying a device, it is worth checking all the details with the seller.