QD-OLED TVs deliver a wide and rich gamut of colors, reproduce deep blacks, have instant response and a wide viewing angle. In addition, they are comfortable and safe for eyesight, says Samsung Display.
QD-OLED – the perfect screen
Samsung Display has published information on the new QD-OLED technology on the network, on the basis of which TVs with diagonals of 140 cm and 165 cm will be released next year, according to some sources close to the manufacturer.
The new screen is based on a QD or Quantum Dots layer, that is, quantum dots. It consists of tiny semiconductor crystals that emit their own light in various colors at a wide viewing angle. Structurally, they are simpler and more efficient than liquid crystals, providing an impressive lightness and thinness of the screen.
Behind the QD is a high-energy blue luminescent layer or OLED, which gives the screen rich colors. Each pixel in it can be disabled individually, creating a perfect black point in its place.
In traditional backlit LCD screens, an image is formed by adjusting the amount of light transmitted through liquid crystals. This is a rather lengthy process, as the electrical signal takes time to do this physical work.
Meanwhile, in QD screens, the electrical signal produces the desired light directly in the QD layer, instantly creating a clear image without liquid crystal artifacts. This fast response ensures that even highly dynamic programs such as auto races or other sporting events can be viewed in high quality.
The new screens also reduce eye-hazardous and sleep-disturbing blue light by 40% -50% compared to LCD counterparts. Moreover, in this indicator, QD surpasses all displays on the market.
Further, QD screens provide a very high degree of color purity and a wide range of colors. Moreover, each shade has a wide range from dazzling bright to deep dark. While conventional screens cover less than 60% of the high BT.2020 standard, then QD screens cover more than 80%.
Another feature of quantum dots is that they emit light evenly in all directions, providing a wide viewing angle. For example, 60 degrees off center in front of an LCD screen reduces perceived brightness by more than 45%. The same figure for the QD screen is only 25%.
The glass covering of TV screens performs a protective function and also perfectly transmits outgoing light. But this solution also has a drawback, since the glass perfectly reflects light from windows and from lighting fixtures, which creates interference. Samsung engineers did not bypass this issue, having developed a special anti-reflective coating that has no analogues for comfortable viewing of the QD screen in any conditions.
Contrast is the most important characteristic of a TV. Traditional screens use backlighting, which can be difficult to accurately control. As a result, the inability to display deep blacks is a known disadvantage of such TVs. In QD 4K screens, each of the 8.3 million pixels is a separate light source with individual control. This achieves an astonishing 1,000,000: 1 contrast ratio with perfect blacks and high image clarity.
Due to the impossibility of precise control of the backlight, as discussed above, LCD TVs often leak light from bright areas to neighboring dark areas. This phenomenon is also known as the halo effect, which is especially noticeable around bright objects against a black background. However, QD screens do not have this disadvantage. Controlling the operation of each pixel allows for correct reproduction of light and dark areas.
Finally, we move on to brightness. Interestingly, its perception depends not so much on its physical size as on the depth of black and saturation of other background colors. For example, two images of the same brightness look different depending on the contrast. It turns out that the better the screen reproduces black, the brighter the picture is perceived, which is clearly demonstrated by the QD TV.