OFweek smart home network news at CES2017, various manufacturers have brought us dazzling new technology, which Samsung introduced a new series of QLED TV is one of the highlights of its products, with its new nanocrystalline semiconductor quantum dot material, effective It has improved luminous efficiency and brought a broad gamut of advancement, which has brought the color display of the screen to a new height. Quantum dot QLEDs evolve LCD technology to "perfect ultimate form" So what exactly is this QLED? What's so special about its application? Has a big company like Samsung recently released new products using this technology? Quantum Dot QLED: Technical Principles/Development History Quantum dot QLED backlight technology QLED, full name in English Quantum Dot light Emitting Diode, Chinese translation is quantum dot light emitting diode. Can also be called quantum screen display technology, which is a new technology between the liquid crystal and OLED, the principle is through the blue LED light source irradiation quantum dots to stimulate red and green light, QLED core technology for "Quantum Dot (quantum "Points"", Quantum dots consist of zinc, cadmium, selenium, and sulfur atoms. As early as 1983, scientists at Bell Labs in the United States conducted an in-depth study. A few years later, Mark Reed, a physicist at Yale University in the United States, officially named it Quantum Dots. QLED principle A quantum dot is a very tiny semiconductor nanocrystal that we cannot see with the naked eye. It is a particle with a particle diameter of less than 10nm and consists of zinc, cadmium, sulfur, and selenium atoms. This material has a very special property: when the quantum dots are subjected to photoelectric stimulation, colored light is emitted, and the color is determined by the material that composes the quantum dots, and its size and shape. Because it has this feature, it can change the color of the light emitted by the light source. Quantum dots have a very narrow emission wavelength range, and the color is relatively pure and can be adjusted. Therefore, the quantum dot display screen will be clearer and brighter than the liquid crystal display screen. Quantum Dot QLED Development In 2005, Cole Sullivan graduated from MIT and founded QD Vision. QD Vision then collaborated with LG Display in South Korea and Solvay, a Belgian chemical company, to research and manufacture QLED active matrix displays. QD Vision is responsible for providing quantum. Point of the core technology, LG Display is responsible for product production. QD Vision is dedicated to quantum dot QLED display technology In addition to QD Vision, Nanosys from Silicon Valley in the United States is also conducting in-depth research on quantum dot QLED backlighting technology, which confirms the bright prospects of quantum dot QLED backlighting technology. Next, what we want to discuss is the technical characteristics of quantum dot QLED backlight technology. In fact, from the perspective of industry support, it can be concluded that quantum dot QLED display technology has the capital to change the market structure. QLED technology analysis: LCD "perfect form" Quantum screen QLED technology analysis Quantum dot QLED display technology is to put the optical material of quantum dots between the backlight and the liquid crystal panel, which can make the color gamut meet or exceed the level of OLED, and even eliminate the polarizer on the light source side, effectively reducing the liquid crystal display products. manufacturing cost. QD QLED working principle diagram Quantum dot QLED display technologies mainly include quantum dot light emitting diode display technology (QLED) and quantum dot backlight technology (QD-BLU). Quantum dots have luminescent properties, and quantum dots (QDEF) in the quantum dot film (QDEF) in the blue LED backlight Red light and green light are generated and mixed with the rest of the blue light transmitted through the film to obtain white light, thereby enhancing the light emission effect of the entire backlight system. Quantum dot QLED display technology has unique characteristics: Whenever stimulated by light or electricity, quantum dots emit colored light, the color of which is determined by the material and size of the quantum dots. Quantum dots can completely convert the blue light emitted by the LED light source into white light (a traditional YAG phosphor can only absorb part of it), which means that at the same brightness, the quantum dot QLED needs less blue light, and the power required for electro-optical conversion It also reduces the power consumption of the backlight system. Equivalent to twice the amount of global Internet traffic transmitted daily. QDs with high color accuracy and more stable images Quantum dot QLED display technology unique advantages so that the TV brightness is effectively increased by 30 to 40%, the backlight system color conversion efficiency is greatly enhanced, the screen color is more beautiful, taking into account the characteristics of energy saving and environmental protection, the screen brightness, color purity are WLED About 2 times the backlight system, the performance improvement is very obvious. Taking into account the inherent deficiencies in the physical characteristics of liquid crystal technology, quantum dot QLED display technology can bring so many revolutions, can be called the "perfect form" of liquid crystal technology. At present, the two major application directions of quantum dots in display technology One is Quantum Dots-Backlight Unit (QD-BLU), which is based on the quantum dot photoluminescence (QD-BLU) technology. Currently, QD-BLU is a solution that is used in the market to solve the problem of insufficient backlight for ordinary LCD TVs. The bright white problem, this color deviation is reflected in the screen image, the user will feel the picture is cold or warm, not reach the best visual experience. The use of blue LEDs to obtain high-purity white light through optical materials (QDEF diaphragms) with red and green quantum dots makes this problem very well solved and at the same time restores a very brilliant color, which belongs to the field of quantum dots for LCD applications. The compromise solution. The QLEDs currently being developed by Samsung are the second type of QDs: Quantum Dots Light Emitting Diode Display (QLED) based on electroluminescent properties, which belongs to the field of quantum dots in display technology. More advanced applications. It is no longer that blue light produces a white light through a layer of quantum dot material to illuminate the LCD screen, but instead it is electrically driven so that the quantum dot itself emits light and produces images by color mixing, eliminating the need for liquid crystal, color film, and the elimination of the backlight unit. This makes the QLED and OLED have similar principles in the display mode. The advantages of quantum dot QLED technology Quantum dot QLED display technology is more stable than OLED At present, OLED market cries and media exposure are high, but in the eyes of TV manufacturers, QD QLED display technology with low cost and high performance is more in line with the needs of the consumer market, and QLED quantum screen display technology counters OLED. Changing the pattern of the television market is not just talking about it, but more practical action. OLED technology is currently very hot Quantum dot QLED display technology directly competes with OLED front, and naturally has its own advantages: 1. Due to the use of organic materials for OLEDs, the three luminescent materials have different life spans that are insurmountable and fatal to themselves. The quantum dot crystals are non-organic, so the working state is more stable, the lifetime is longer, and the cost is lower. 2. Because the process is complicated and the production yield is too low, it has always been a problem that large-screen OLEDs cannot overcome. However, the QLED process flow is relatively simple and has inherent advantages in large-scale mass production. 3. QLED color performance is more perfect, color gamut can easily reach the most stringent color standard BT2020 more than 90%, while the OLED TV color gamut is far beyond the traditional LCD TV, but under the BT2020 standard, about 70%. 4. In the same picture quality, QLED energy-saving performance is expected to reach 2 times the OLED screen. Cost, production, color, energy consumption, the four major differences between QLED and OLED. From this comparison point of view, QLED does not seem to be more than "a little" than OLED. Compared to LG's difficult position on the large-screen OLED, the status of Samsung's seemingly bold decision on QLED, and careful thought, perhaps it is a good move with confidence. QLED is supported by international giant brands According to Samsung Display scientists, QLED production cost is only half of the OLED display, which is more conducive to market promotion. In addition to the United States QD Vision (associated with LG Display) and Nanosys, Samsung Display began researching QLEDs in 2011. Liang Qichun, assistant president of TCL Group and general manager of Brand Management Center, once said: "QD QLED display technology is independently developed by its own Huaxing Optoelectronics (only refers to the TCL brand itself), and QD display performance of quantum dots is better than that of OLED TVs with high vocal performance. , And the manufacturing cost is much lower than the OLED TV, has a broader market space. "On the current market, QLED is just a technical upgrade in the LCD field, but according to Samsung's information, Samsung's future choice of QLED is a combination of traditional LCD A new type of display technology that is advantageous to OLED is expected to be available after 2019. The development of QLED is a long way to go to sum up OLED has become the next generation TV due to its own advantages and continuous maturity of technology. This is already a trend in the industry. Basically, there is no one company that stands out and OLED is not good. Therefore, the development of OLED TV is more smooth and fast. The QLED controversy that Samsung puts forward now is: Someone questioned QLED that QD TV that already exists on the market at present, only a technological improvement of LCD field, can't compare with OLED. Of course, QLED is still in the stage of technology research and development, and it must have some difficult problems to overcome. During this period, whether OLED technology will leapfrog development to overcome its own defects, QLED technology will encounter bottlenecks in the development and fetal death, really difficult to predict. However, as consumers gradually return to the nature of television and pursue image quality, whoever is next-generation display technology may not be so important. It is the core of competition to provide the best display in a cost-effective manner. The technical dispute between the two major advantages of QLED and OLED, leaving us with a lot of imagination about the future of the display space, this is the most exciting part.