QLED Technology – What are Quantum Dots?

QLED – Samsung’s term for the combination of Q Picture , Q Style and Q Smart . Together, according to the South Korean manufacturer, the “ultimate TV experience.” While Q Style describes the customizable Samsung design concept and Q Smart the intuitive access to all content through a single interface, Q Picture is based on Samsung’s advanced Quantum Dot technology . However, it should be remembered that the term “QLED” is neither defined by Samsung nor is it legally protected in any way. In general, the term covers all TV sets that work with Quantum Dots. With Samsung, TCL and Hisense, there is now even a ” QLED Alliance”, Who participate together in the progressive development of the interesting technology. Also Philips works in some series with Quantum Dots. Similarly, LG (“Nano Cell” in the SUPER UHDLCD- based TVs ) and Sony (“Triluminos”) rely on comparable technologies.

Samsung QLED TV in “Curved” format: Q8C

With “Quantum Dots” comes the Q in QLED. Because LED stands, as with the LCD TV, for “light emitting diode” – LED . These inorganic lamps are in fact even at QLED devices for backlight used, though not in the same form. With Quantum Dots, colors are generated differently on the screen than with the usual – and with clear drawbacks – LCDs with color filters and white LEDs as the backlight.

What are quantum dots?

These are semiconductor particles ranging in size from 2 to a maximum of 10 nanometers in diameter.Depending on their size , they produce different colors: for example, the smallest particles produce blues, the larger ones produce reddish colors. These tiny elements can then be applied in large numbers to a layer that is integrated between the backlight and the LC display.

QLED televisions use a multitude of tiny semiconductor particles

In the future, these Quantum Dots, similar to the organic LEDs in the OLED TV, should shine themselves. However, this is not possible according to the current state of the art, even the Quantum Dots currently need a backlight. However, QLED TVs do not rely on white LEDs, but on pure blue LEDs . White LEDs are usually blue LEDs with a yellow phosphor coating.These produce a comparatively impure light with a problematic spectrum . With Quantum Dots you can fall back on pure blue LEDs, which emit a much purer light. The combination then results inricher colors with more gradations and very high brightness . In addition, from the 2017 device generation, Samsung is packing the tiny nanoparticles into a metal jacket.On the one hand, this prevents oxidation and increases the lifetime, on the other hand, the Quantum Dots can be placed inside the TV more specifically to provide even higher color authenticity and better viewing angle stability .

Practical effects

The QLED technology, and Samsung’s approach in particular, has clear benefits for the end user. The focus here is on an above-average color spectrum andextreme brightness values . For example, Samsung’s 2017 flagship Q9F achieves values of 2,000 nits (except the largest Q9 model in 88 inches, which leaves it at 1,500 nits). These enormous brightnesses are especially important for the playback of HDR content, especially when there is no complete darkness in the room and you still want to enjoy a complete picture impression.

In addition, it offers a very large volume of paint .This takes into account how different brightnesses influence the bandwidth of the reproducible hues. Using the very wide color gamut of the QLED TV models, films and TV series with high-dynamic-range information can be reproduced naturally and authentically. Likewise, this color information can berealized even in bright ambient light , which is generally a knockout topic for HDR content.
Last but not least, the devices with Quantum Dot technology, despite the excellent visual performance, are very energy efficient .


The Samsung QLED TVs promise more vivid and brighter colors than the competition of OLED televisions. Without compromise, this is not possible.As already mentioned, QLED TVs still need a backlight. This is the reason that such a device usually has a slightly greater depth than an OLED TV.

The depth of high-quality QLED TVs is usually higher than those of competitors who work with OLEDs

In addition, of course, Quantum dots currently can not light themselves and are dependent on a backlight. With strong light / dark contrasts , this inevitably leads to problems, and the brightness distribution is not always completely homogeneous. Although Samsung wants to optimize this with new top-of-the-line devices in 2018 featuring LED backlighting across the board, it will still be difficult to compete with the self-luminous OLEDs in this specific area.

At maximum brightness , QLED is ahead. This circumstance can also lead to a broader color spectrum , as described in the previous paragraph . Especially since OLED could be at the upper limit in terms of Nit values, whereas Quantum Dots has not exhausted all aspects yet.

Overall, both technologies offer advantages and disadvantages . A clear recommendation is difficult to pronounce due to the different requirement profiles.The film enthusiast, who has a darkened room at his disposal, will make the right choice with an OLED.More flexible, yet close to the authentic visual reproduction, is one with a QLED television.

OLED vs QLED – what’s better?

Quo vadis, QLED?

QLED is still in its infancy, so far only a fraction of the potential of this technology is exhausted. However Quantum Dots should not be dismissed as pure marketing on the part of a manufacturer that completely shuts down OLED. Sooner or later, QLED is expected to replace OLED, here are all TV manufacturers agree – even the OLED top dog LG is this view.However, the goal, self-luminous quantum dots, will require several years of development work. Until then, the end consumer has to choose between technologies that currently both serve as the basis for excellent TV sets.

User’s opinion – Owning the 2018 Samsung Q9FN/Q9 QLED HDR TV

Samsung QLED TV – Quantum Dot Explained

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