About QLED in the world heard at the beginning of 2017, when it was presented by Samsung as an innovative technology in the production of television screens. In March selling models with such displays was launched on the world market, and a month later be in Russia. To understand what this technology is, what is it good and what are its weaknesses, yet could not all mass consumers (especially that speech about the mass consumption of news too early). Many questions arise when comparing technologies OLED and QLED with a similar name, but fundamentally different principles of image transmission.
The letter Q is an abbreviation of the term "quantum dots", translated as "quantum dots", which will be discussed below. The following letters LED indicate three words "light-emitting diode", also known as labeling is known to all LCD screens are backlit LEDs. Almost all models of monitors that have a year release late 2010 are LED display.
Based on the abbreviations, it becomes clear that, using the terminology of QLED, the manufacturer is talking about something radically new, but new technologies are widely used flat panel displays.
About quantum dots
Called "quantum dots" refers to nanocrystals that have the ability to emit light and change its hue when you change sizes and materials of their production, i.e. to glow a specific color when the given parameters. Only three colors — blue, red and green (abbreviated RGB). That they are sufficient to create on the screen the rest of the color palette, today known even to schoolchildren.
As regards the notion of "quantum", then it refers to their extremely small size, since to see them separately is possible only with a very powerful microscope at high magnification. To understand the order of the size of quantum dots, we can say that they are only 3 times larger than DNA molecules, whose size is of the order of 2 nanometers. In comparison with human hair, which is already the subject of foreseeable: its thickness varies between 60 and 80 thousand nanometers.
The invention of quantum dots relates to 1981 and is owned by the Soviet physicist A. our stuff to EA*. After 4 years in the study of their properties by the American scholar Louis Breaststroke was discovered their ability to glow in different colors as a result of focused radiation. However, the potential of this discovery and its practical incarnation of the world saw much later, when science has been able to achieve the level of industrial production of crystals with precisely specified dimensions. The size refers to the parameter at the level of the size of the atom. Pioneers in the creation of LED displays were the Samsung in the not too distant 2011.
The device matrix QLED
In this case we are not talking about the release of some special matrices, but only on the extension of the screen layer of quantum dots between the LCD layer and the light emitting diodes of blue color display backlighting. Absorbing the radiation of the latter, they relay them on with a predetermined wavelength. This allows to obtain more high-quality, clean basic RGB color compared to conventional matrices.
An additional advantage is that the design be virtually superfluous and excluded filters previously executed the task of improving the color settings. As is well known, their application is inevitably reduced image quality due to the refraction of light as they pass and losing its intensity. After we cleaned the filters, the image becomes richer in color and brighter in intensity.
QLED and OLED — a fundamental difference
About whether there is a difference between them and how significant is, is to talk separately because the answers are not for all buyers is obvious. There is a difference and it is fundamental. The basis of OLED displays are organic carbon compounds. Here basically there is no illumination, and hence the filters. The pixels in this design break under the influence of electric current. For this reason, the screen may acquire the notorious "deep black color" mentioned in advertisements or reviews. Pixel which is lit by electricity, in the de-energized form really becomes completely black, which is not true of quantum dots that preserve microscopic doses of the illumination.
The production of diagonal TV with OLED technology is expensive and technically challenging, and despite the constant promises of "it's cheaper" cheaper, apparently, is not going to. QLED technology on this background looks more advantageous, because it initially has a lower cost and has a good potential to reduce it more. Claims to OLED displays for their burnout is theoretically proved, but practically this is unlikely to worry because the visual difference should pass for many years.
The next point is image brightness. In this respect definitely win the QLED screens (comparison on the basis of the model range in 2018). Technical characteristics of the claimed brightness is different about 1.5-2 times.
As for the quality of light transmission, the independent comparative characteristics on this parameter were not carried out, and the issue remains controversial.
And finally, the external dimensions of the screens on QLED technology is much superior to the competitor.
What good monitors QLED
- The most accurate color reproduction with minimal distortion in the structure of the world. The image is vivid and rich.
- A wide color gamut.
- The preservation and accurate transmission of fine details in the lightest and darkest fragments of the picture, its high-detail (and are based on advertising statements about 10-bit color and support high-quality video). An obvious disadvantage — it's still a poor choice of video settings, HDR quality.
- No need for full re-equipment of production lines has a positive impact on pricing, although cheap QLED screens to say, of course, before.
- Slower burnout in the long run.
Is it worth buying?
At the moment, talking about a wide mass consumption of the product is not due to the relatively high prices on televisions of the QLED. What is behind advertising reviews, we all know, since it is unlikely that they are objective and comparative analyses there is no indication of accurate models. But we can say quite confidently that these screens are at least not inferior to the quality characteristics in comparison with the most eminent representatives of the OLED technology according to the characteristics of brightness, color accuracy and dynamic range.