Quantum TV
Quantum-dot TV is a kind of TV that uses the quantum dot technology backlight and is a kind of LCD TV.
It differs from traditional LCD TVs in that it uses different backlights, resulting in a lot of differences in performance. Compared with conventional LCD-backlit LCD TVs, it has advantages in picture quality, energy saving and environmental protection, and it has become a new LCD TV in the industry. The direction of development.
At the end of 2014, domestic and foreign manufacturers have successively launched televisions equipped with quantum dot technology.
Chinese name
Quantum TV
Foreign name
Quantum Dot TV
technology
Quantum Dot Crystal + Blue Light = Red/Green/Blue
Types of
LCD TV
Color coverage
NTSC110%
research process
Quantum Dots (QDs) are tiny inorganic nanocrystals that are invisible to the naked eye. Whenever you are stimulated by light, quantum dots emit very pure colored light. Backlights using quantum dot materials are currently the most pure color backlights. Quantum-dot TV uses the purest quantum dot light source as the backlight source, and it revolutionizes the display of the full color gamut.
The relationship between light and wavelength
Quantum dots have a distinctive characteristic: Whenever they are stimulated by light or electricity, the quantum dots emit colored light. The color of the light is determined by the composition and size of the quantum dots. Generally, the smaller the particles, the longer the particles absorb the long wave. The larger the particles, the shorter the waves will absorb. 2 nanometer-sized quantum dots absorb long-wavelength red and show a blue, 8-nanometer-sized quantum dot that absorbs short-wave blue and displays red. This feature allows quantum dots to change the color of the light emitted by the light source.
Quantum dot display technology has been fully upgraded in various dimensions such as color gamut coverage, color control accuracy, and red, green and blue color purity. It is regarded as the commanding point of global display technology and is also regarded as the global display technology revolution. Companies such as Samsung, LG, and Apple have all indicated that they are actively promoting the development of quantum dot display technology, and companies such as Amazon and Asustek have also adopted quantum dot technology to improve their product image quality. With the first release of Quantum Dot TV by TCL, the international quantum dot display camp has begun to take shape.
According to the authoritative inspection data released by Liu Zhigang, deputy general manager of the National Radio and Television Product Quality Supervision and Inspection Center, the color gamut of ordinary LED TVs is only 72% under the NTSC standard, and only 82% of the first-generation high-color televisions are the second generation. High color television is about 96%, while quantum dot TV color gamut coverage is as high as 110%.
After 2000, scientists began to explore the possibility of using quantum dots on the display. However, the overall performance of QLEDs such as efficiency, lifespan, and processing technology is far from meeting people's expectations.
With the continuous deepening of the research on QLEDs by scientists, the industrialization process has also made more and more progress. The quantum dots mentioned today are often made up of a semiconductor element and a metal compound as a core, surrounded by a layer of tiny particles of other materials. So what is a quantum dot display?
Quantum dots are quasi-zero-dimensional nanocrystals with a crystal grain diameter of between 2 and 10 nanometers. Quantum dots are stimulated by electricity or light to emit high-quality pure monochromatic light of various colors depending on the diameter of the quantum dots. . The so-called QLED liquid crystal display screen is a new type of liquid crystal display in which a quantum dot film is inserted between a blue LED backlight source and a liquid crystal panel. The quantum dot film generates a true blue, green, red, and true color white light under LED blue light excitation, QLED even It is regarded as the best solution to improve color gamut in the future. Authoritative test data shows that under the NTSC standard, the NTSC ratio of the gamut of ordinary LED TVs is only 72%, and LCD TVs equipped with QLED backlights (QLED TVs for short) can achieve color gamut coverage of 110%. At the same time, Nanosys CEO Jason Hattraf said in an interview that QLEDs are not limited in size and can be used on TV screens that are 80 inches or larger and can also be used on small screens.
In the time dimension, QLEDs are the third generation of innovative technology for light emitting diodes (LEDs). The first generation is widely known as a blue LED device (GaN LED) with a rare earth phosphor. Although it is more energy-efficient than an incandescent lamp, its preparation process is rather harsh and affects product costs. The second generation was born in the late 1970s. Organic LEDs (OLEDs), production methods based on vacuum thermal evaporation, have been applied to small screens such as mobile phones and products that do not need to be always lit, but the center of emission of such devices is organic molecules, and the product life and yield are both Unstable.
In technology research, China does not lag behind people. Jin Yizheng Research Group of the State Key Laboratory of Silicon Materials of Zhejiang University cooperated with Peng Xiaogang's research team and reported a kind of LED based on multilayer quantum dots prepared by solution.
The preparation method is based on a low-cost, solution process that has the potential to be used for large-scale production, and the overall performance surpasses that of all known red-light devices for the solution process, in particular the practical use of luminescence to a lifetime of 100,000 hours. . Peng Xiaogang disclosed that "the next step is to develop high-performance QLEDs of other colors."
Quantum Dots (QDs) consist of zinc, cadmium, selenium, and sulfur atoms and are nanometer-sized materials with a crystal diameter of between 2 and 10 nanometers. Their unique optoelectronic properties are subject to electro-optical stimulation and will be based on quantum dots. Diameter size, emitting a variety of different colors of pure monochromatic light, can change the color of light source. Quantum dots can form a thin film on the LED backlight of LCD TVs. With a blue LED, they can emit full-spectrum light, which can adjust the light, finely adjust the backlight, and greatly improve the color gamut performance. More vivid.
Technical comparison
The advantages of quantum dot TV
Full color gamut shows advantages.
2. Narrowband continuous spectrum with high color purity.
3.95% is close to natural light, strong in color reproduction, and excellent in color rendering.
4. Inorganic materials. Strong stability, long life, not easy to aging.
5. Precise color control.
6. High efficiency and strong energy saving. The disadvantages of quantum dot TV
Quantum TV is more expensive than regular led TV.