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Television is an essential household item in people's lives. From the earliest CRT TVs to the current LCD TVs, the picture is getting better and better as the products become thinner and thinner. In short, people have found that the colors on TV screens are becoming more and more like the world we see, and the virtual reality is getting closer to reality.
The reason why television has such an evolution is mainly due to the advancement of screen display technology. In the early 1950s, electron beam tubes were used for computer output displays. In the early 1950s, electroluminescent display devices were made, and the display technologies such as AC-DC powder and AC and DC films were explored, and the brightness and luminous efficiency were gradually improved. The liquid crystal display device was made in the 60s, and plasma display and light-emitting diode display also appeared during this period. These technologies, without exception, all achieved mass production after decades, which has gradually changed the landscape of the television industry.
The display industry has now transitioned from CRT to LCD (liquid crystal display). According to experts, LCD is currently the main display of the world. Behind it is a white light source. After the cooperation of liquid crystals, filters, and polarizers, finally a certain color point appears the color you want, compared to CRT, LCD. The benefits are numerous, thin and affordable. With the continuous development of new technologies and new materials, the era of quantum dot TV is coming.
Quantum dots are the best and most outstanding luminous materials that humans have discovered so far.
According to Peng Xiaogang, an expert from Zhejiang University, quantum dots may be the most outstanding luminous material ever discovered by humans, and are most promising for display.
In fact, the quantum dots are solution semiconductor nanocrystals, and each small particle must be a single crystal. The peripheral surface of the nanocrystal must have a surface-like organic ligand like a hair filament to ensure the solution processability of the quantum dots. Quantum dots have excellent properties. Given a chemical composition of a semiconductor, if you simply change the size of the quantum dot, from 2 nanometers to 8 nanometers, the same chemical composition can be from blue to green to yellow to orange. , to the red launch. Changing the size can be achieved, and it is continuously adjustable. Which wavelength you need to be able to achieve which wavelength, this thing has not been found in human history.
In addition, the color purity of quantum dot luminescent materials is very pure, which is also difficult to compare with the luminescent materials currently found by humans. Quantum dots are inorganic crystals with very high stability. This is not comparable to other organic light-emitting materials.
According to experts, color display technology is based on the principle of three primary colors: red, green and blue. We consider that there is a triangle with green on the top, blue on the left, and red on the right. The more color the three color points cover, the more colors they cover (corresponding to the larger area of ​​the triangle). Then, the smallest triangle is the older color gamut standard (RGB). NTSC is currently the more widely used color gamut standard, and the largest color gamut is the BT2020 standard, basically covering all colors that can be distinguished by human eyes. Display technology has been developing in the past. So the standard is getting bigger and bigger. What Hollywood wants to push is BT2020. Currently, there are only two technologies that can be used in BT2020: laser and quantum dots.
In fact, an increase in the color gamut not only increases the number of colors that can be displayed, but also greatly contributes to the texture and three-dimensionality of the screen. For example, if you look at this flower, you can see that it is red. In fact, there are many kinds of red that are slightly different. Quantum dot backlights can express and distinguish a large variety of red colors, resulting in a three-dimensional appearance and texture. If you can't do this, many reds become one color and there is no three-dimensionality and texture. In theory, only quantum dot technology can achieve 100% of the BT2020 standard.
Compared with various display technologies, QLED TV is the development direction
Some institutions have done comparative tests. Three TVs of the same size, 65 inches. In the color gamut, LCD TVs without quantum dots can reach 78%, quantum dots can reach 92%, and OLEDs are 86%. According to experts, at present, the color gamut of Apple's mobile phones is actually only over 70% according to NTSC, only about 50% according to BT2020, so the color will not be so rich, but what level can be achieved if quantum dots are used? The limit of quantum dots can be 100% of BT2020, that is, all colors can be covered.
The test data shows that in terms of brightness, both LCD TVs have reached 500 nits, and the OLED extremum is 440 nits, generally only up to 90 nits. However, LCD display consumes a lot of energy, and only 2% to 4% of the light efficiency after the screen is passed. In other words, if the backlight of the LCD is a 100 watt light source, the front light is only 2-4 watts. The other energy is to point the "electric furnace" in the house. As for OLED, the brightness is generally not high, because if OLED is too bright, burning screen is even more powerful.
A few years ago, everyone thought that OLED was the next generation of display technology and would replace LCD. Just because OLEDs are thin and they can be made on flexible substrates, the color gamut can be improved. However, the lifetime of OOLEDs is a big problem. Large-screen OLEDs cannot be realized by using active tricolor luminescence. This is also the case for companies such as Samsung. The root cause of using OLEDs on large screens has been publicly abandoned.
Although we have seen many advantages of quantum dot TV, the current quantum dot TV is still in the first stage, that is, the photoluminescence stage. Although it has approached and surpassed the level of other display technologies, it still has potential to be tapped. After the second phase of “electroluminescence†has been achieved, Quantum-dot TV will be unique both in terms of display level and cost advantage. From a worldwide perspective, high-resolution quantum dot LCD TVs, such as TCL Multimedia, Hisense, and South Korea’s Samsung, are all doing, and even more gratifying is that China is in the development and application of new materials for quantum dot technology. The leading position will completely change the situation of Japanese and Korean companies’ monopoly technology.
Quantum dot technology is safe and reliable, not to be confused by marketing tactics
Quantum dot technology has broad prospects and has a wide future in LED, solar cells, bio-medical markers, etc. It has become one of the strategic directions of China's national high-tech development. There are three quantum dot pioneering companies that are currently in greater influence: QDVision (MIT Technology), Nanosys (Berkeley Technology), and Najing Tech (Arkansas-Zheda University Technology). In terms of business, China's TCL is the first to achieve mass production, and the second generation of “electroluminescence†will also be officially launched in about five years, thus completely breaking through the display technology barriers of Japanese and Korean companies.
In practical production, it is very difficult to synthesize practical quantum dots. The quantum dot size is equivalent to one ten-thousandth of the width of the hair filament, and instead of making a crystal, it is necessary to produce 10 23 crystals or more, each of which must also be the same size. This technology was developed in 2000 by Prof. Peng Xiaogang's "green" organic solvent route in the laboratory of Arkansas.
However, there is still controversy. Some people think that quantum dots are cadmium-containing. The toxicity of cadmium needs to be taken seriously, and some companies use this as a propaganda to mislead the public. In fact, according to experts, a square centimeter quantum LED requires only 0.000002 cadmium, which is one ten-millionth of a nickel-cadmium battery, roughly equivalent to the cadmium content of a cigarette, and a TCL 55 inch that was listed last year. Quantum-dot TVs have a cadmium content of approximately one kilogram of international standard rice cadmium. Also, quantum dots use cadmium oxide, which does not volatilize, and is actually safer than aromatic compounds in OLEDs. The US Environmental Protection Agency once crushed the quantum dot element and soaked it with hydrochloric acid. The end result was that no cadmium was detected in the hydrochloric acid solution.
We have seen that the QD display technology has already received the attention of the national “13th Five-Year Planâ€. The “Key Quantum Dot Luminescent Display Key Materials and Devices Research†led by Peng Xiaogang was selected by the Ministry of Science and Technology as a key R&D project “Strategic Advanced Electronicsâ€. The "Key Material" project, the Ministry of Industry and Information Technology (MIIT) announced that the printing of quantum dots is a key technology for the country's key development. With the joint efforts of countries, companies, and R&D institutions, China's quantum dot display technology will be expected to lead the world in new breakthroughs, and the future development of quantum dots will be unimaginable.
There are good hardware and display effects, of course, with a rich content resources, the combination of software and hardware can play the greatest value of a TV. In terms of content, it is recommended to install a sofa butler - the sofa butler is a third-party app store designed specifically for smart TVs, Android box users, carefully providing television, box users with high-quality television exclusive version of the application, including with live Or on-demand video and audio and video software, various types of recreational competitive video game software and daily office entertainment management system management tools. click to download
The reason why television has such an evolution is mainly due to the advancement of screen display technology. In the early 1950s, electron beam tubes were used for computer output displays. In the early 1950s, electroluminescent display devices were made, and the display technologies such as AC-DC powder and AC and DC films were explored, and the brightness and luminous efficiency were gradually improved. The liquid crystal display device was made in the 60s, and plasma display and light-emitting diode display also appeared during this period. These technologies, without exception, all achieved mass production after decades, which has gradually changed the landscape of the television industry.
Quantum dots are the best and most outstanding luminous materials that humans have discovered so far.
According to Peng Xiaogang, an expert from Zhejiang University, quantum dots may be the most outstanding luminous material ever discovered by humans, and are most promising for display.
In fact, the quantum dots are solution semiconductor nanocrystals, and each small particle must be a single crystal. The peripheral surface of the nanocrystal must have a surface-like organic ligand like a hair filament to ensure the solution processability of the quantum dots. Quantum dots have excellent properties. Given a chemical composition of a semiconductor, if you simply change the size of the quantum dot, from 2 nanometers to 8 nanometers, the same chemical composition can be from blue to green to yellow to orange. , to the red launch. Changing the size can be achieved, and it is continuously adjustable. Which wavelength you need to be able to achieve which wavelength, this thing has not been found in human history.
In addition, the color purity of quantum dot luminescent materials is very pure, which is also difficult to compare with the luminescent materials currently found by humans. Quantum dots are inorganic crystals with very high stability. This is not comparable to other organic light-emitting materials.
In fact, an increase in the color gamut not only increases the number of colors that can be displayed, but also greatly contributes to the texture and three-dimensionality of the screen. For example, if you look at this flower, you can see that it is red. In fact, there are many kinds of red that are slightly different. Quantum dot backlights can express and distinguish a large variety of red colors, resulting in a three-dimensional appearance and texture. If you can't do this, many reds become one color and there is no three-dimensionality and texture. In theory, only quantum dot technology can achieve 100% of the BT2020 standard.
Compared with various display technologies, QLED TV is the development direction
Some institutions have done comparative tests. Three TVs of the same size, 65 inches. In the color gamut, LCD TVs without quantum dots can reach 78%, quantum dots can reach 92%, and OLEDs are 86%. According to experts, at present, the color gamut of Apple's mobile phones is actually only over 70% according to NTSC, only about 50% according to BT2020, so the color will not be so rich, but what level can be achieved if quantum dots are used? The limit of quantum dots can be 100% of BT2020, that is, all colors can be covered.
The test data shows that in terms of brightness, both LCD TVs have reached 500 nits, and the OLED extremum is 440 nits, generally only up to 90 nits. However, LCD display consumes a lot of energy, and only 2% to 4% of the light efficiency after the screen is passed. In other words, if the backlight of the LCD is a 100 watt light source, the front light is only 2-4 watts. The other energy is to point the "electric furnace" in the house. As for OLED, the brightness is generally not high, because if OLED is too bright, burning screen is even more powerful.
A few years ago, everyone thought that OLED was the next generation of display technology and would replace LCD. Just because OLEDs are thin and they can be made on flexible substrates, the color gamut can be improved. However, the lifetime of OOLEDs is a big problem. Large-screen OLEDs cannot be realized by using active tricolor luminescence. This is also the case for companies such as Samsung. The root cause of using OLEDs on large screens has been publicly abandoned.
Although we have seen many advantages of quantum dot TV, the current quantum dot TV is still in the first stage, that is, the photoluminescence stage. Although it has approached and surpassed the level of other display technologies, it still has potential to be tapped. After the second phase of “electroluminescence†has been achieved, Quantum-dot TV will be unique both in terms of display level and cost advantage. From a worldwide perspective, high-resolution quantum dot LCD TVs, such as TCL Multimedia, Hisense, and South Korea’s Samsung, are all doing, and even more gratifying is that China is in the development and application of new materials for quantum dot technology. The leading position will completely change the situation of Japanese and Korean companies’ monopoly technology.
Quantum dot technology is safe and reliable, not to be confused by marketing tactics
Quantum dot technology has broad prospects and has a wide future in LED, solar cells, bio-medical markers, etc. It has become one of the strategic directions of China's national high-tech development. There are three quantum dot pioneering companies that are currently in greater influence: QDVision (MIT Technology), Nanosys (Berkeley Technology), and Najing Tech (Arkansas-Zheda University Technology). In terms of business, China's TCL is the first to achieve mass production, and the second generation of “electroluminescence†will also be officially launched in about five years, thus completely breaking through the display technology barriers of Japanese and Korean companies.
In practical production, it is very difficult to synthesize practical quantum dots. The quantum dot size is equivalent to one ten-thousandth of the width of the hair filament, and instead of making a crystal, it is necessary to produce 10 23 crystals or more, each of which must also be the same size. This technology was developed in 2000 by Prof. Peng Xiaogang's "green" organic solvent route in the laboratory of Arkansas.
However, there is still controversy. Some people think that quantum dots are cadmium-containing. The toxicity of cadmium needs to be taken seriously, and some companies use this as a propaganda to mislead the public. In fact, according to experts, a square centimeter quantum LED requires only 0.000002 cadmium, which is one ten-millionth of a nickel-cadmium battery, roughly equivalent to the cadmium content of a cigarette, and a TCL 55 inch that was listed last year. Quantum-dot TVs have a cadmium content of approximately one kilogram of international standard rice cadmium. Also, quantum dots use cadmium oxide, which does not volatilize, and is actually safer than aromatic compounds in OLEDs. The US Environmental Protection Agency once crushed the quantum dot element and soaked it with hydrochloric acid. The end result was that no cadmium was detected in the hydrochloric acid solution.
We have seen that the QD display technology has already received the attention of the national “13th Five-Year Planâ€. The “Key Quantum Dot Luminescent Display Key Materials and Devices Research†led by Peng Xiaogang was selected by the Ministry of Science and Technology as a key R&D project “Strategic Advanced Electronicsâ€. The "Key Material" project, the Ministry of Industry and Information Technology (MIIT) announced that the printing of quantum dots is a key technology for the country's key development. With the joint efforts of countries, companies, and R&D institutions, China's quantum dot display technology will be expected to lead the world in new breakthroughs, and the future development of quantum dots will be unimaginable.
There are good hardware and display effects, of course, with a rich content resources, the combination of software and hardware can play the greatest value of a TV. In terms of content, it is recommended to install a sofa butler - the sofa butler is a third-party app store designed specifically for smart TVs, Android box users, carefully providing television, box users with high-quality television exclusive version of the application, including with live Or on-demand video and audio and video software, various types of recreational competitive video game software and daily office entertainment management system management tools. click to download