New Samsung TVs with quantum dot displays will appear in Russia in July. Plasma TV, LCD, LCD, LED, OLED, Quantum dot


In 2017 Samsung company launched a line of its new TVs on the market, the screens of which are made using QLED technology. The abbreviation can be read as Quantum dot () + LED (light emitting diode) = QLED, although, logically, it should still be QDLED, but QLED sounds much nicer, so South Korean marketers decided to leave this particular name option for quantum dot screens.

Many may think that QLED is new development, but in fact, this is already the third generation of Samsung TVs using quantum dots, because we saw screens made using this technology in the SUHD TV lines of 2015 and 2016. Although, of course, there are many changes in the models that went on sale in 2017.

For example, the Moth Eye filter in Samsung QLED TVs has now been replaced with an ultra-thin film that not only reduces reflection on the panel, but also helps create more dark shades black and also helps preserve colors at sharper viewing angles. Where the KS8000 (for example) slowly loses saturation when viewed from more extreme angles, the Samsung Q9 performs much better.


Samsung finally achieved their goal and presented a worthy alternative OLED displays. I have already said in that Samsung at one time refused to invest in the development and improvement of OLED screens, “leaving” this matter to competitors from LG and taking a different path, through the development of LED displays. As a result, after several years, these developments resulted in nothing more than quantum dot screens, which, in fact, are the same LED displays. And yes, again, QLED is positioned as the main competitor to organic OLED displays.

So, to summarize the last four paragraphs, we can say this: QLED is an advanced technology LED screens on quantum dots, models of which were presented in the SUHD line recent years. Thus, Samsung has separated the QLED flagships from the second-tier models, which are now SUHD. And the new name, to be honest, sounds much better and louder than the previous one, to match its main competitor - LG OLED.

How it works

Quantum dot technology involves placing a layer or film of quantum dots in front of conventional LED backlight. The layer consists of tiny particles, each of which, passing through light from the LED backlight at the output, creates its own light in a certain color, depending on the size (from 2 to 10 nanometers) of that very point.

Basically, the size of the particle dictates the wavelength of light it emits, hence the large color palette. According to Samsung representatives, quantum dots provide over a billion colors.


In the third generation of quantum dot TVs, called QLED, the particles have been improved and now have a new core and shell made of a metal alloy. This upgrade improved both overall color accuracy and color accuracy at higher peak brightness.

It is the ability to create a large color volume with high brightness makes a claim to outperform in the market OLED screens, which do not retain colors well at peak brightness, and the peak brightness in OLED, let's be honest, is much lower than in QLED.

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Maksim 2017-06-15 20:32:53

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IN Lately Along with this, technology is gaining popularity, which we recently talked about on the pages of Mediasat. This time we want to introduce readers to quantum dot technology.

As journalists from The Conversation UK write, the Korean electronics manufacturer LG set the tone for everyone else by announcing at the January CES 2015 exhibition the upcoming release of ultra TVs to the market. high definition(Ultra HD) with displays that use quantum dot technology, an improved method for producing color displays.

What exactly is a “quantum dot”?

The technology, which has become a significant new step in the production of displays after , is to pass rays of blue light through nano-crystals ranging in size from two to ten nanometers (nm), which absorb light of one wavelength and emit light of another, specific wavelength . Each dot, depending on its size, emits light of a certain color. A film consisting of quantum dots having the dimensions necessary to emit red and green light is placed in front of the screen backlight unit. Achieving a glow effect using quantum dots narrows the wavelength of the resulting red and Green colour, which means reducing the amount of light blocked by the LCD filter. This means that we get clearer color reproduction and more vibrant colors.

Cadmium quantum dots produce a particularly pure green color. NASA

With its announcement, LG is ahead of other manufacturers who want to gain a leadership position by improving contrast, saturation and expanding the color gamut (the range of colors that a display can reproduce) - that is, everything that the use of quantum dots can provide. All this makes these displays ideal for viewing high-definition and ultra-high-definition content, as well as for all those who work in the field graphic design, photo and video production.

Transition to a new level of TV quality

The transition to Ultra HD television does not only mean increasing the number of pixels and producing higher resolution screens. Manufacturers and broadcasters want to provide an environment in which the video and photo images delivered to the viewer have the highest possible dynamic range while maintaining economic profitability for the producer.

And this is not something from the “distant future” series. In fact, new standards are what is necessary to implement any new technology– are already clearly defined. The ITU-rec 2020 standard for ultra-high-definition television provides for broadcasting TV programs at speeds up to 120 frames per second, with a higher bit rate, as well as with expanded color scheme and improved contrast.

Currently, content known as “high-definition programming” is streamed at a resolution of 1920 x 1080 pixels, with a specific frame rate, color range and contrast that allows it to be played back seamlessly on any compatible display. However, both the broadcast and film industries are already capable of producing material whose quality exceeds the approved standard. The problem now is the lack of a sufficient number of devices on the market that could display video material in such high quality - and therefore, there is little point in producing a large number of content that isn't much to watch.

Thus, the use of quantum dots expands the capabilities of ultra-high-definition displays, allowing in the future to transmit content to viewers with enhanced dynamic range. There are also additional benefit: Quantum dots are much cheaper than all other competing display technologies High Quality– such as OLED, organic light-emitting diodes. At past CES, the technology was loudly touted as the next great technology of the future, but it appears its star has begun to set before it has even fully risen into the sky.

Currently, quantum dots are only used in combination with other illumination technologies, but it is possible to develop methods that allow them to be used as a separate technology. In any case, since 2015 and in the near future, the world's best quality video and photo content playback in high resolutions will be associated using quantum dots.

Quantum dot display

Quantum dots irradiated with ultraviolet light. Various sizes Quantum dots emit different colors.

To create a prototype, a layer of quantum dot solution is applied to a silicon board and a solvent is sprayed. A rubber stamp with a comb surface is then carefully pressed into the layer of quantum dots, peeled off, and stamped onto glass or flexible plastic. This is how stripes of quantum dots are applied to a substrate. In color displays, each pixel contains a red, green, or blue subpixel. These colors are combined in varying intensities to create millions of shades. The researchers were able to create repeatable patterns of red, green and blue stripes by repeatedly using stamping technology. The stripes are applied directly to the matrix of thin-film transistors. The transistors are made from amorphous hafnium indium zinc oxide, which can conduct higher currents and is more stable than conventional amorphous silicon (a-Si) transistors. The resulting display has subpixels about 50 micrometers wide and 10 micrometers long, small enough to be used in phone screens.

According to Seth Coe-Sullivan, founder and CEO of QD Vision, many problems have been solved by Samsung researchers and engineers, but best devices based on quantum dots are not as efficient as displays based on organic light-emitting diodes. It is also necessary to increase the service life, as the brightness of QLED displays begins to decrease after 10,000 hours.

Story

The idea of ​​using quantum dots as a light source was first developed in the 1990s. In the early 2000s, scientists began to realize the full potential of quantum dots as the next generation of displays.

Notes


Wikimedia Foundation. 2010.

See what “Quantum dot display” is in other dictionaries:

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    - (English: Surface conduction electron emitter display) display with electron emission due to surface conductivity. The name SED is used by Canon and Toshiba. Similar displays created by Sony and AU... ... Wikipedia

    - (ELD) is a type of display created from a layer of electroluminescent material consisting of specially treated phosphorus or GaAs crystals between two layers of conductor (between a thin aluminum electrode and a transparent electrode). At… … Wikipedia Wikipedia

    - “Swinging” stereoscopy. Technology GIF animations allows you to create a sense of volume even with monocular vision. A similar mechanism for the perception of volume is implemented by nature, for example, chickens, shaking their heads, provide high-quality ... ... Wikipedia

For five years, Samsung engineers have perfected the technology to produce super-high resolution SUHD displays at quantum dots. The matrix of this type of monitor is built on 1-5 nanometer particles (1000 times smaller than a hair), which emit light depending on the voltage and size.

The screen matrices of the 7-series models are represented by three diagonals:
49” – 78,000 rub.;
55” – 102,000 rubles;
65′‘ – 170,000 rub.

A good 65-inch TV (our test one) costs that much. The resolution is 3840x2160 pixels (4K Ultra HD).

In fact, UE65KS7500U TVs are hybrid, because only red and green pixels are quantum dots, and blue is LED. The reason for hybridity lies in the service life of the monitor - 30 thousand hours, and the blue quantum dot lives only 10 thousand. Therefore, it was replaced with an LED diode.

Advantages of “quantum” monitors:

  • energy costs are 30-50% less compared to LCD;
  • display brightness is 50-100 times higher;
  • Quantum dots are suitable for flexible panels;
  • due to the ultra-small dot size, the matrix has a high pixel density;
  • The number of light shades is 64 times more than on other Samsung TVs.

This is where we’ll finish the physical and technical introductory part and move on to what consumers see with their eyes - design, management, operating system, capabilities.

Design

The TV screen is curved so that the viewer can plunge deeper into the picture before his eyes.

A couple of years ago, Samsung was aiming for thin, invisible bezels. Then he returned them. Apparently, they are technologically important, either for creating stiffeners or for placing electronics at the edges. Still, few people pay attention to the frames.

The steel-colored perimeter flows elegantly into a monolithic stand with legs. The weight of the stand is 0.5 kg, the weight of the TV is 23.2 kg.

Ports and connectors

On the TV body there are:
– USB
– LAN
– CI/PCMCIA
– Ex-Link

Few? Samsung supplies TVs with an external One Connect hub for those who lack built-in ports.

Additionally we get:
– 2 antenna connectors (cable and satellite)
– 4 HDMI 2.0a
– 2 USB
– optical audio output.

Image quality

Samsung's immersive effect is created by the Auto Depth Enhancer, which increases the contrast of foreground objects relative to the background.

Coating Ultra Black reduces glare on the screen. Not completely, but noticeable to the eye.

The entire 7-series KS7500 is a powerful picture enhancer. If the video is of low quality, it is converted to SUHD format on the fly. If the picture has low contrast, then the technology Precision Black regulates the flow of light, causing the image to come to life. The TV plays popular video formats (avi, mkv, mov, etc.).

4 settings are responsible for gamma and color gamut: dynamic, standard, normal, cinema.

The only thing that was disappointing: the TV couldn’t cope with the complex fractal structure of Emma Stone’s blouse from the interview below. It turned out that the jacket lived its own life and with a second’s delay moved behind the actress.

I played with the Automotion Plus setting, but the strange effect persisted.

Control

Smart TV is controlled from an elegant remote control. It is minimalistic, like Apple TV, and at the same time more functional. He has hidden top cover buttons, and only the main ones are made physical, such as volume and channel switching. The remote control is not touch sensitive.

The KS7500's controls are intuitive. The fact that there are practically no manipulators on the remote control does not prevent you from getting to desired function. The only thing is that you stumble when entering characters in the movie search. The remote control is equipped with a microphone for voice input commands, but this feature suddenly turned off. The Korean voice recognition server probably crashed during the test.

Tizen OS

The Tizen operating system on which the TV runs is good for everyone, except for its reluctance third party developers port applications to it. The main providers of media content are built into the shell. Additionally, online cinemas ivi, Okko, Megogo are installed from the store. Consider that there are no games - only two (El Dorado casino and Monkey Madness arcade). Maybe this is for the best: if you want to play, buy a separate console.

Tizen is better optimized for TV and works faster than Android. You can feel it. The hardware is controlled by a 4-core Quad Core processor.

Conclusion

If we ignore the small number of applications and games, the Samsung SUHD 4K Curved Smart TV 65 KS7500 7 Series does an excellent job main task– convey a clear and vivid image to the owner. Powerful processor and a set of various technologies stretch low-quality video to the 4K level. The screen's quality reserve will last for several years to come.

Quantum dots are tiny crystals that emit light with precisely controlled color values. Quantum dot LED technology significantly improves image quality without affecting the final cost of the devices, in theory :).

Conventional LCD TVs can only cover 20-30% of the color range that the human eye can perceive. The image is not very realistic, but this technology is not focused on mass production of large display diagonals. Those who follow the TV market remember that back in early 2013 Sony introduced the first TV based on quantum dots (Quantum dot LED, QLED). Large manufacturers TVs will release quantum dot TV models this year, Samsung has already presented them in Russia under the name SUHD, but more on that at the end of the article. Let's find out how displays produced using QLED technology differ from the already familiar LCD TVs.

LCD TVs lack pure colors

After all, liquid crystal displays consist of 5 layers: the source is white light emitted by LEDs, which passes through several polarizing filters. Filters located at the front and rear, together with liquid crystals, control the passing light flux, reducing or increasing its brightness. This happens thanks to pixel transistors, which affect the amount of light passing through the filters (red, green, blue). The generated color of these three subpixels, on which filters are applied, gives a certain color value of the pixel. The color mixing happens quite smoothly, but it is simply impossible to get pure red, green or blue this way. The stumbling block is filters that transmit not just one wave of a certain length, but a whole series of waves of different lengths. For example, orange light also passes through a red filter.

An LED emits light when voltage is applied to it. Due to this, electrons (e) are transferred from the N-type material to the P-type material. N-type material contains atoms with an excess number of electrons. P-type material contains atoms that lack electrons. When excess electrons enter the latter, they release energy in the form of light. In normal semiconductor crystal it is typically white light produced by many different wavelengths. The reason for this is that electrons can be in different energy levels. As a result, the resulting photons (P) have different energies, which results in different wavelengths of radiation.

Light stabilization with quantum dots

IN QLED TVs Quantum dots act as a light source - these are crystals only a few nanometers in size. In this case, there is no need for a layer with light filters, since when voltage is applied to them, the crystals always emit light with a clearly defined wavelength, and therefore color value. This effect is achieved by the miniscule size of a quantum dot, in which an electron, as in an atom, is able to move only in a limited space. As in an atom, the electron of a quantum dot can only occupy strictly defined energy levels. Due to the fact that these energy levels also depend on the material, it becomes possible to specifically tune the optical properties of quantum dots. For example, to obtain red color, crystals from an alloy of cadmium, zinc and selenium (CdZnSe), the size of which is about 10–12 nm, are used. An alloy of cadmium and selenium is suitable for yellow, green and blue colors, the latter can also be obtained using nanocrystals of a zinc-sulfur compound of 2–3 nm in size.

Mass production of blue crystals is very difficult and expensive, so introduced in 2013 by the company Sony TV is not "thoroughbred" QLED TV based on quantum dots. At the back of their displays is a layer of blue LEDs, the light of which passes through a layer of red and green nanocrystals. As a result, they essentially replace the currently common light filters. Thanks to this, the color gamut increases by 50% compared to conventional LCD TVs, but does not reach the level of a “pure” QLED screen. The latter, in addition to a wider color gamut, have another advantage: they save energy, since there is no need for a layer with light filters. Thanks to this, the front part of the screen in QLED TVs also receives more light than in regular TVs, which transmit only about 5% of the light flux.

QLED TV with Quantum Dot Display from Samsung

Samsung Electronics presented premium TVs in Russia made using quantum dot technology. New products with a resolution of 3840 × 2160 pixels turned out to be not cheap, but flagship model completely valued at 2 million rubles.

Innovations. Curved Samsung TVs SUHD based on quantum dots differ from common LCD models in higher color rendering characteristics, contrast and power consumption. The integrated SUHD Remastering Engine allows you to upscale low-resolution video content to 4K. In addition, the new TVs received Peak Illuminator and Precision Black intelligent backlighting, Nano Crystal Color technology (improves color saturation and naturalness), UHD Dimming (provides optimal contrast) and Auto Depth Enhancer ( automatic setting contrast for certain areas of the picture). IN program basis TV lies operating system Tizen with an updated platform Samsung Smart TV.

Prices. The Samsung SUHD TV family is presented in three series (JS9500, JS9000 and JS8500), where the cost starts from 130 thousand rubles. This is how much the 48-inch model UE48JS8500TXRU will cost Russian buyers. The maximum price for a TV with quantum dots reaches 2 million rubles - for the UE88JS9500TXRU model with an 88-inch curved display.

New generation TVs using QLED technology are being prepared by South Korean Samsung Electronics and LG Electronics, Chinese TCL and Hisense, and Japanese Sony. The latter has already released LCD TVs made using quantum dot technology, which I mentioned in the description of Quantum dot LED technology.


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