QLED is the main competitor of OLED
The last feature in the field of traditional LED panels are quantum dots.
Quantum dots are nanoparticles of special semiconductor materials (silicon, selenide and cadmium sulfide, indium arsenide) that begin to glow after a beam of light hits them. The color of the glow is determined by the size of the nanocrystals. Most often, manufacturers apply quantum dots to lighting or add them as an additional intermediate. This filter removes parasitic tones and purifies the light emitted by the diodes.
What’s better, QLED?
It’s simple: Q stands for ” quantum dots “and LED is a” light-emitting diode ” in a nutshell, an LED-backlit LCD display familiar to all of us.
If you are reading this article from a monitor or portable display published after 2010, you are likely to look at the LED display. It turns out that when it comes to QLED, it is just a new technology for the production of LCD screens.
What are quantum dots?
Quantum dots are nanocrystals that, depending on their size, can glow in a specific color. In the production of arrays, of course, red, green and blue dots are needed. Remember that of these three components in the RGB range (red, green, blue) all other colors are added?
The word Quantico clearly says that the emitters described are so small that they can only be seen under a very powerful microscope. In comparison, the size of the DNA molecule is 2 nanometers, while the size of the blue, green and red quantum dots does not exceed 6 nanometers. It can be roughly compared with a predictable value: on average, the thickness of a human hair is 60-80 thousand nanometers or 0.06-0.08 mm.
By the way, quantum dots were invented in 1981 year and were received by the Soviet physicist Aleksey Ekimov. Then, in 1985, the American scientist Louis Bras discovered that these elements could glow under the influence of radiation, and the color of the glow depended on the physical size of the nanocrystalline.
So why are we talking about quantum dots only now? Because only recently the technology has reached a level where the industry can obtain crystals of the right size with atomic precision. The first prototype of the QLED display was presented by Samsung, and this significant event occurred in 2011.
QLED is not a new super technology for the production of special matrices. It involves adding a layer with quantum dots applied between a liquid crystal layer and an LED-backlit display.
Absorbing the radiation from the blue LEDs of the backlight, the quantum dots re-emerge it with a well-defined wavelength. This results in purer base colors (blue, green, and red) than traditional matrix LEDs.
At the same time, the filters used in LED TVs are excluded from the design as unnecessary. There, they are needed to improve color accuracy, but they reduce the brightness of the image because, passing through the filters, the radiation of the backlight refracts, losing its intensity. This reduces color saturation.
What are the good QLED screens?
QLED screens are arranged in such a way that when forming an image, minimal distortion is applied to the light structure. The result is very accurate color reproduction: the image is bright, rich, the shades are uniform, and the color coverage is very, very wide.
If traditional LED TVs lose a lot of detail in the lightest and darkest areas of the image, QLED accurately stores and transmits them, hence all the claims about HDR support and 10-bit color in the advertising material. Of course, you also need the source of the video you are watching to be high quality and detailed. This, by the way, is a big problem-the suitable materials are still very few.
Buy QLED or not?
I would like to give you a specific answer to this question, but we can not objectively judge the difference in image quality.
However, the fact that QLED at least is no worse than the best OLED representatives, there is no doubt.