“This is not the final form of quantum dot display technology. If you can get rid of LED backlights, the advent of foldable TVs and foldable phones will be just around the corner.
At the end of September, domestic TV manufacturer TCL launched a high-end sub-brand “Chuangyi (English name is “Xess”), and its quantum dot TV, tablet, mobile phone Several terminal products. Among them, Quantum Dome TV X2 is featured as an important flagship product and is expected to be officially launched in the market three months later.
The data released by TCL shows that the X series of quantum dot TVs can achieve 110% of the industry’s highest color gamut and pure color display because of the use of Yuecai quantum dot display materials. And accurate color expression. As a new technology that has recently exploded, quantum dot technology has played a new generation of revolutionary overtures of display technology because it brings not only better display quality, but also the concept of a foldable screen. further.
Technology from the future
The quantum dot technology was born in 1983. Scientists at Bell Labs in the United States first studied it, but forgot to name it. A few years later, Yale University physicist Mark · Reid officially named this semiconductor micro-block as “quantum dots” and still use them to this day. How to apply the principle of quantum dot illumination to display devices has long been studied.
At present, quantum dot display technology includes two types, one is a quantum dot light emitting diode, and the other is a backlight technology based on a blue chip. Zeng Haibo, director and professor of the Institute of Nanophotonic Materials, School of Materials Science and Engineering, Nanjing University of Science and Technology, told the reporter of the Chinese Journal of Science. Among them, a quantum dot light-emitting diode (QLED) is a quantum dot as a light-emitting layer, and is electrically driven to convert light into light. The backlighting technique is based on the principle of photoluminescence of quantum dots, also known as OLED. That is, the light emitted by the blue chip is used to excite the mixing components of the quantum dots, thereby emitting light of a plurality of colors. When these lights are combined, white light is generated, and the color display can be realized by the control of the front optical film group. The traditional QLED quantum dots are composed of zinc, cadmium, selenium and sulfur atoms, and these quantum dots are very small in size, and are only particles having a particle diameter of less than 10 nm. Whenever a quantum dot is stimulated by light or electricity, it emits different colored light.
In traditional display technology, it is impossible to rely on backlights and picture tubes. The imaging principle of the LCD panel can be summarized as the addition of liquid crystal molecules between two glass substrates, but the liquid crystal itself cannot emit light, and the voltage must be applied to make the molecular arrangement change in a zigzag manner. The screen passes through the collision of the electron group to create a picture and pass the external light. Perspective reflections to form a picture. In the meantime, the backlight changed from a cold cathode backlight (CCFL) to a backlight of a light emitting diode (LED).
Which CCFL and LED are more advantageous, the debate on this has not stopped, and the emergence of quantum dot technology has interrupted the competition between them. However, the quantum dot TV that TV giants are now launching is not really a quantum dot TV. Because manufacturers do not fully utilize the characteristics of quantum dots that do not require backlighting, they are added as a luminescent material between the LED backlight and the LCD panel. When the LED emits a blue light source, it will “illuminate the quantum dots with a diameter of about 2 to 10 nanometers in front, and the quantum dots that are illuminated by the blue light will exhibit a full spectrum of light, thereby greatly improving the color saturation.
“ This is not the final form of quantum dot display technology. Zeng Haibo explained, “If you can get rid of LED backlights, then the advent of foldable TVs and foldable phones will be just around the corner.
OLED or QLED?
Although the quantum dot display technology has a bright future, the current industry discussion on whether OLED has industrial advantages or QLED has more development prospects has been ignited. Zeng Haibo believes that OLED and QLED have their own advantages and disadvantages. In terms of industrialization, QLED is easier to implement because it can produce QLED products with almost no need to make too many changes to existing product lines, but OLEDs do not. . At present, the two major companies in South Korea respect two technologies, which also form the current competitive landscape of OLED and QLED. “However, I think that the real market-oriented display technology depends on the cost of the product, which cost can be lowered, and which one is more likely to be quickly accepted by the market. Zeng Haibo said.
From the perspective of cost, in terms of existing production technology, the OLED display panel manufacturing process is relatively complicated, because the OLED display panel requires a deposition process during the fabrication process, and the deposition requires a shadow mask. device. Therefore, the production of OLEDs is expensive. In comparison, QLED does have a bigger advantage in this regard.
And, theoretically QLED has a longer life and better color performance. According to the BT.2020 standard for the next-generation ultra-high definition video production and display system promulgated by the International Telecommunications Union Radiocommunication Department in 2012, the Apple mobile phone that brings people visual enjoyment can only reach 50. Around % means that half of the color is not displayed, but the quantum dot can achieve 100% color display. At the same time, it is also more energy efficient than OLED. “If you can really achieve quantum dot technology that does not rely on backlights, then screens such as TVs can be produced just like newspapers. Zeng Haibo said.
Subverting Display Technology
Zhejiang UniversityProfessor Peng Xiaogang, a professor of the Department of Science, said in July this year that scientists and media face-to-face activities have said that China’s quantum dot technology is already at the world’s leading level. Now, quantum dot TV, which still uses LED as backlight, belongs to the first generation. However, it is expected that in the next five years, the second-generation quantum dot TV will adopt the principle of electroluminescence, which means that a clear image display can be obtained without the need for a backlight. In the future, when the electroluminescent quantum dot technology is put into use, the lighting and display industries will be subverted. “Display technology will affect many industries, not only in the areas of television, mobile phones and other reforms, but also in the automotive technology, and even the reform of traffic lights. Zeng Haibo said.
At that time, the use of quantum dots to print TVs like newspapers can effectively reduce waste and play an important role in mitigating the global energy crisis. It can be said that “the quantum dot has a bright future.”
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