Recently, a large number of OLEDs in the media will replace a large number of reports on LCDs, especially in the case that some Japanese and Korean manufacturers are tightening layout sensitive moments on OLEDs. This view is even more difficult. However, mainland enterprises entering the LCD liquid crystal display industry itself started late, and the industrial chain layout has not yet been perfected. Is it necessary to face the fate of being lagging behind? Below, we analyze and compare the development trends of OLED and LCD from the perspective of technology development:
First, from the stage of technology development: LCD and OLED will coexist for a long time
Modern new display refers to flat solid-state display (FPT) compared to traditional vacuum display (CRT), mainly including liquid crystal display (TFT-LCD), organic electroluminescent display (OLED), plasma display (PDP), inorganic thick Membrane electroluminescent display (TDEL), field emission display (FED), large-screen display of light-emitting diodes, laser display, projection display, etc.
Humans have discovered that liquid crystal (LC) phenomena can be traced back to 1888, and organic electroluminescence (OLED) technology can be traced back to 1936. With the development of basic manufacturing technology, these two technologies can be applied in the field of electronic display.
At the end of the 20th century, in the fierce competition of display technology transformation, LCD monitors overcome many difficulties, from weak to strong, defeated PDP, FED, TDEL stand out among many new displays and become the mainstream display in the new century.
In the primary stage of the liquid crystal display industry, the stage of capacity expansion has ended, and industrial development has entered a stage of technological upgrading centered on technological improvement. In the next decade, liquid crystal displays will achieve major breakthroughs in system integration, reducing power consumption and reducing costs.
TFT is an extension of large-scale semiconductor integrated circuit technology. With the development of science and technology, TFT technology has great potential for development, and amorphous silicon TFT is only its starting point. At present, it has become the biggest technical bottleneck restricting the sustainable development of liquid crystal displays. Instead, it is a wide bandgap semi-oxide conductor. Its forbidden band width is about 3.7 eV, which is completely transparent to visible light. Therefore, TFTs made of oxide semiconductors have no problem of aperture ratio, and mobility of oxide TFTs. It is much higher than amorphous silicon TFTs, so the first step with oxide TFTs can fully meet the high pixel density requirements of 3D TVs.
The power consumption of liquid crystal displays is already relatively low compared to plasma and OLED. However, LCD TVs still have a huge room for power consumption. At present, the utilization rate of light energy of liquid crystal display is less than 10%. From the technical point of view, the use of oxide semiconductor, LED field sequential backlight technology, etc., is expected to increase the utilization rate of light energy of liquid crystal display to over 90%. The liquid crystal display will become a true energy-saving display product, and the power consumption of the future 40-inch liquid crystal display may drop to about 10 watts.
The cost of a liquid crystal display is mainly composed of a backlight, a color film, a liquid crystal, a polarizing plate, a driving circuit, a glass substrate, other materials and manufacturing costs (including equipment, plant, power, and labor), and the cost of the six components is as high as 80. %the above. Through technological improvements, color film and polarizer will be eliminated, the drive circuit is expected to be directly integrated into the glass substrate, and electronic printing technology is applied in the color film manufacturing process, which not only reduces the cost, saves a lot of materials, but also makes the liquid crystal display. The manufacture is more environmentally friendly. The research on the electronic printing technology of TFT is now carried out with the goal of eliminating the entire exposure process. LCD monitors will become the cheapest displays after successful system integration, field sequential backlights and natural light valves.
Second, from the trend of technology development: LCD and OLED will eliminate this long
The most important driving force in the development of science and technology is material science. From the Stone Age to the Bronze Age, the Iron Age, and today's semiconductor silicon era, the advancement of materials is decisive. We believe that the 21st century will end the myth of semiconductor silicon, and human beings will enter the inexhaustible and inexhaustible material age.
Organic electroluminescence (OLED), as a pioneer in the organic era, has shown many advantages. Nowadays people say that OLEDs should replace liquid crystal displays. In the future, the advantages of OLEDs compared with current liquid crystal displays are not suitable. The liquid crystal display itself is constantly improving, and OLED is also making continuous progress. We must use dynamic vision to improve and develop OLEDs and liquid crystal displays. The goal is clear and the technical route is clear.
OLEDs and liquid crystal displays are not replaced and replaced. They are different varieties of the new generation of the same generation. They are a pair of sister flowers of new displays, which will continue to learn from each other and compete for development. LCD monitors start from laptops, and OLEDs may be on the handheld terminals.
The most important driving force in the development of science and technology is material science. From the Stone Age to the Bronze Age, the Iron Age, and today's semiconductor silicon era, the advancement of materials is decisive. We believe that the 21st century will end the myth of semiconductor silicon, and humanity will enter an era of inexhaustible organic materials.
Organic electroluminescence (OLED), as a pioneer in the organic era, has shown many advantages. Nowadays people say that OLEDs should replace liquid crystal displays. In the future, the advantages of OLEDs compared with current liquid crystal displays are not suitable. The liquid crystal display itself is constantly improving, and OLED is also making continuous progress. We must use dynamic vision to improve and develop OLEDs and liquid crystal displays. The goal is clear and the technical route is clear.
OLED and LCD monitors compete to see who can make progress faster. To surpass it, there must be a road map that transcends. It is impossible to go beyond the liquid crystal display by taking the route of LCD display development.
OLEDs must make breakthroughs in materials technology and process technology. Only the mass production of the 8th generation line can be realized. It is not enough to only make a large-sized display. There is a technical breakthrough and a long way to go.
The new world of display in the 21st century must be an era in which all kinds of displays are displayed. LEDs will be displayed on large outdoor screens, urban beautification, and stage multimedia applications will dominate. The small-sized display of OLED will complement the liquid crystal display to promote the development of handheld terminal application technology. Laser projection will play a role in collective situations such as education and film. LED micro-projection will play a role in business, communication, home theater and other fields. TDEL may have a place in the military and industrial display sector.
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