With the advancement of display technology, color TV industry has been continuously innovating. From the CRT era to the LCD era, products are getting thinner and thinner, and the effects of the screen are getting better and better. When the emergence of OLED and QLED, the display industry can finally get rid of the backlight source and achieve self-luminescence. This gives TV products a qualitative improvement in their image quality and design advantages. For self-luminous OLEDs, many consumers are already familiar. For QLEDs that have just entered the color TV industry, few people know it. So, what exactly is QLED?
Similar to OLEDs, QLEDs are self-illuminating QLEDs, short for Quantum Dot Light Emitting Diodes. Also known as QD-LEDs or QLEDs, QLEDs are self-illuminating technologies that do not require additional light sources. It can exhibit a very pure, saturated color, with a narrow bandwidth, and the emission wavelength can be easily adjusted by changing the size of the quantum dot. In addition, QLEDs can provide high color purity and durability, combined with the efficiency, flexibility and low processing costs of organic light-emitting devices, and can provide even better display results. The QLED structure can be adjusted over the entire visible wavelength range from 460nm (blue) to 650nm (red) (the human eye can detect light from 380 to 750nm). By adjusting the chemical composition of quantum dots and device structures, the emission wavelength has been continuously extended to the ultraviolet and near-infrared range.
The structure of the QLED is very similar to that of the OLED technology, with the main difference being that the emission center of the QLED is a quantum dot such as a cadmium selenide (CdSe) nanocrystal. The quantum dot layer is sandwiched between layers of electron transport and hole transport organic material, and an electric field is applied to move electrons and holes into the quantum dot layer where they are captured to the quantum dot layer and recombine to emit photons.
However, QLED quantum dots, because of their vulnerability to heat and moisture, cannot achieve the same vapor deposition method as self-emitting OLEDs, and can only develop inkjet printing processes. Currently, the QLED technology is still in its infancy, and there are constraints such as low reliability/efficiency, unstable blue component life, and difficult R&D of the solution process. Therefore, the industry believes that it will take at least 10 years from commercialization at this stage.
Display market chaos, not all QDs are QLEDs
Today, the TV market has been flooded with many products that have been named "QD TV," but in reality, all QD TVs currently sold are still LCD TV-optimized products, that is, QD-LCD TVs. Self-luminous. These "quantum-dot TVs" all use photoluminescent quantum dot technology. When photoluminescent quantums are hit by light, they can emit light of their own color. These quantums work in conjunction with blue light-emitting diodes for television. Backlight power supply.
The blue light emitting diode produces blue light and provides quantum dots with two different methods for supplying photon energy to produce red and green light. One way is to place a blue light-emitting diode wrapped with red and green quantum dots along the edge of the TV screen. Another method used by Samsung's SUHD TVs is to add a complete quantum dot layer to the LCD TV's LED sandwich. All of these methods can make the LCD TV display a wide color gamut (WCG). However, there is still a problem. Quantum dot TVs adopting photoluminescence technology are still LCD TVs. They only increase the emission of quantum dot films on liquid crystal TV backlights. The inherent light leakage of LCD products, low contrast, and poor viewing angles. The slow response and other phenomena are still inevitable.
For good images, contrast is very important. Although the adjustment function of LCD backlight can make it close to the contrast of OLED or plasma display, its effect is limited. In order to obtain a higher level of image quality and higher contrast, each pixel needs to be precisely controlled, ie, pixel by pixel.
In photoluminescent quantum dots, electroluminescent quantum dots directly emit electrons. If you need a dark pixel to represent a dark scene, you can turn off the pixel directly. In this case, there will be no extra light generated by the light and no light leakage will occur. This is simply not possible with the LCD monitor, even with local dimming. ("Local" is a relative term) also cannot be done. Pixel-by-pixel control is the key to optimizing image quality, while the currently available OLED TVs rely on the self-illuminating characteristics of each pixel, so that stunning black display effects can be achieved, and the depth of color can be improved by the detailed representation of each pixel. Make the picture flexible and vivid.
The QLED TV currently on the market is not the self-illumination technology that TV technology ultimately points to. As mentioned earlier, it is just a kind of LCD TV that uses quantum dot film. In the future, the core of future display development will be self-luminous technology, and OLED, as a self-luminous technology that has been commercialized, is perfect in terms of image quality and design. Non-self-luminous liquid crystal display products absolutely cannot achieve the image quality advantage and revolutionary design derived from self-luminous structures. Currently, the only next-generation display technology is OLED, which will surely lead the self-illumination camp and the future display market.
Similar to OLEDs, QLEDs are self-illuminating QLEDs, short for Quantum Dot Light Emitting Diodes. Also known as QD-LEDs or QLEDs, QLEDs are self-illuminating technologies that do not require additional light sources. It can exhibit a very pure, saturated color, with a narrow bandwidth, and the emission wavelength can be easily adjusted by changing the size of the quantum dot. In addition, QLEDs can provide high color purity and durability, combined with the efficiency, flexibility and low processing costs of organic light-emitting devices, and can provide even better display results. The QLED structure can be adjusted over the entire visible wavelength range from 460nm (blue) to 650nm (red) (the human eye can detect light from 380 to 750nm). By adjusting the chemical composition of quantum dots and device structures, the emission wavelength has been continuously extended to the ultraviolet and near-infrared range.
The structure of the QLED is very similar to that of the OLED technology, with the main difference being that the emission center of the QLED is a quantum dot such as a cadmium selenide (CdSe) nanocrystal. The quantum dot layer is sandwiched between layers of electron transport and hole transport organic material, and an electric field is applied to move electrons and holes into the quantum dot layer where they are captured to the quantum dot layer and recombine to emit photons.
QLED device structure and light emission principle
Advantages and disadvantages coexist. QLEDs are not yet commercially available in the short term. They are also self-illuminating technologies. QLEDs also have many advantages in image quality and design. QD Vision, an internationally renowned display and lighting solutions company, claims that its developed printed QLED film meets or exceeds the NSTC color standard, eliminating the need for color filters. The superior color of the QLED can eventually translate into higher luminous efficiency advantages over other display technologies, and the QLED also has a lower operating voltage and exhibits a turn-on voltage at the material's bandgap voltage, which makes the QLEDs higher efficiency. However, QLED quantum dots, because of their vulnerability to heat and moisture, cannot achieve the same vapor deposition method as self-emitting OLEDs, and can only develop inkjet printing processes. Currently, the QLED technology is still in its infancy, and there are constraints such as low reliability/efficiency, unstable blue component life, and difficult R&D of the solution process. Therefore, the industry believes that it will take at least 10 years from commercialization at this stage.
Display market chaos, not all QDs are QLEDs
Today, the TV market has been flooded with many products that have been named "QD TV," but in reality, all QD TVs currently sold are still LCD TV-optimized products, that is, QD-LCD TVs. Self-luminous. These "quantum-dot TVs" all use photoluminescent quantum dot technology. When photoluminescent quantums are hit by light, they can emit light of their own color. These quantums work in conjunction with blue light-emitting diodes for television. Backlight power supply.
The blue light emitting diode produces blue light and provides quantum dots with two different methods for supplying photon energy to produce red and green light. One way is to place a blue light-emitting diode wrapped with red and green quantum dots along the edge of the TV screen. Another method used by Samsung's SUHD TVs is to add a complete quantum dot layer to the LCD TV's LED sandwich. All of these methods can make the LCD TV display a wide color gamut (WCG). However, there is still a problem. Quantum dot TVs adopting photoluminescence technology are still LCD TVs. They only increase the emission of quantum dot films on liquid crystal TV backlights. The inherent light leakage of LCD products, low contrast, and poor viewing angles. The slow response and other phenomena are still inevitable.
Quantum-dot TVs on the market today only have a layer of quantum dots on the LCD.
Compared to photoluminescent quantum dots, quantum dots of electroluminescent technology are true QLED technologies that can realize self-luminescence. For good images, contrast is very important. Although the adjustment function of LCD backlight can make it close to the contrast of OLED or plasma display, its effect is limited. In order to obtain a higher level of image quality and higher contrast, each pixel needs to be precisely controlled, ie, pixel by pixel.
In photoluminescent quantum dots, electroluminescent quantum dots directly emit electrons. If you need a dark pixel to represent a dark scene, you can turn off the pixel directly. In this case, there will be no extra light generated by the light and no light leakage will occur. This is simply not possible with the LCD monitor, even with local dimming. ("Local" is a relative term) also cannot be done. Pixel-by-pixel control is the key to optimizing image quality, while the currently available OLED TVs rely on the self-illuminating characteristics of each pixel, so that stunning black display effects can be achieved, and the depth of color can be improved by the detailed representation of each pixel. Make the picture flexible and vivid.
The QLED TV currently on the market is not the self-illumination technology that TV technology ultimately points to. As mentioned earlier, it is just a kind of LCD TV that uses quantum dot film. In the future, the core of future display development will be self-luminous technology, and OLED, as a self-luminous technology that has been commercialized, is perfect in terms of image quality and design. Non-self-luminous liquid crystal display products absolutely cannot achieve the image quality advantage and revolutionary design derived from self-luminous structures. Currently, the only next-generation display technology is OLED, which will surely lead the self-illumination camp and the future display market.
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