Laser display technology is the fourth generation of display technology after black-and-white display, color display, and digital display. Among the many continuously developing display technologies, laser display technology represents the future development trend and mainstream direction of display technology, and is the focus of competition in the display field in the future. Laser display technology has inherited the digital display
Figure 1: The color gamut space comparison between laser display technology and other display technologies
The development history of laser display technologySoon after the invention of the laser, people began the research of laser display. Before 1996, gas laser was used as the light source to realize scanning laser full-color display. However, due to the short life of gas laser, low efficiency, and bulky size, it cannot be practically used. Due to the rapid development of semiconductor lasers (LD) and LD-pumped all-solid-state lasers (DPL), the door to the development of laser display technology to the industry has been opened. Internationally, Germany, Japan, the United States, South Korea and other countries have invested a lot of manpower and material resources in the research of all-solid-state laser display technology. International display giants have recognized the arrival of "a revolution in the display field". International giants such as Japan's Sony, Mitsubishi Electric, Seiko Epson, South Korea's Samsung, Texas Instruments, Germany's Osram, and Jena Optics are stepping up the development of this technology.
At present, the international laser display technology has developed to the early stage of industrialization, and the industrialization of core key technologies and the cultivation and application demonstration of supporting industries have become the current development focus. The next 5 to 10 years will be the golden period for the development of the laser display technology industry in the world and our country. On the one hand, in the next ten years, the current mainstream flat panel display technology will face a new round of industry upgrades, and the market prospects are broad; on the other hand, On the one hand, the key technology of laser display has been initially solved, and my country has already possessed and mastered some core technologies and intellectual property rights of independent innovation. The overall technology is internationally advanced, and the key technologies such as color gamut coverage are internationally leading and have significant advantages. With the continuous support of the National 863 Program "Eight. Five", "Nine. Five" and "10. Five", as well as the support of the Knowledge Innovation Project of the Chinese Academy of Sciences and the Beijing Municipal Government, the Chinese Academy of Sciences insists on independent innovation and close cooperation with superior units , Organized by the Institute of Optoelectronics, Chinese Academy of Sciences, and all units have made great progress in the field of laser full-color display.
In September 2002, the first full solid-state laser full-color display was realized in China. At present, 60-inch laser home theater, 84-inch and 140-inch large-screen laser display prototypes have been developed, and 200-inch large-screen laser display was successfully developed in May 2006. The engineering prototype has the largest color gamut in the world and can display the richest colors in the world. The overall level is in line with the international level. It has independent intellectual property rights. A number of achievements have reached the international leading and advanced level. Key devices and technologies such as laser display have their own patent protection. my country has the conditions for independent development, gradual realization of industrialization, and establishment of a national laser display industry. Laser full-color display will become the mainstream of high-end displays in the future. It will be used in public information large screens, digital cinemas, home theaters, pilot simulation training, astronomical observations, large-screen command display systems, water screen imaging performances, and personalized helmet display systems. Great development space and broad market application prospects.
Now we are following the instructions of Academician Lu Yongxiang, President of the Chinese Academy of Sciences, "Laser display is a leap-forward development of display technology and should be gradually industrialized", and strive to reduce costs, improve reliability, and enable laser displays to enter the market as soon as possible. In the 2008 Olympic Games, my country will use the three concepts of "Green Olympics, High-tech Olympics, and Humanistic Olympics" to show the world the achievements of China's reform and opening up for 20 years and the spirit of the Chinese people to strive for self-improvement and vigorousness. It is also for the innovative development of laser display technology. Provides historical opportunities. Taking the opportunity of the application of the MOC command system of the large-screen laser projection display system, we will reverse the passive situation of the first three generations of display technologies in my country that "have no independent intellectual property rights and are controlled by others" and occupy the mainstream display market in the future.
Development status of laser display technology at home and abroadThe international development of laser display technology. In 2002, the worldwide display market sales were about 50 billion U.S. dollars, and the annual sales are expected to reach 500 billion U.S. dollars by 2026. Because of such a huge market, Japan, South Korea, the United States and other countries have invested a lot of manpower and material resources in the development of laser display technology, intending to compete for the international market of next-generation display devices. The Japanese industry, which has taken the lead in LCD, PDP and digital TV development competitions, calls laser display technology "a revolution in the history of human vision." The Japanese government attaches great importance to laser display technology, and is now accelerating its development with the power of the country, intending to maintain its status as a major power in the display industry. Representative research work includes Sony Corporation of Japan, Mitsubishi Electric Corporation of Japan, Samsung Electronics of South Korea, LG Corporation, and Laser Power of the United States. In 1985, at the Tsukuba World Expo site, Sony used a CRT arrangement to arrange a huge TV wall 25 meters high and 40 meters long, which caused a strong response. At the 2005 World Expo in Aichi, Japan's Sony Corporation introduced the latest laser display system at the time-"The House of the Earth". With a length of 50 meters and a height of 10 meters, the entire spherical screen is seamlessly spliced. At the same time, based on the splicing technology, a laser theater with a unit of 6 m2 and a total area of ​​500 m2 is integrated. The audience can see the 30-meter fin whale swimming slowly on the screen. The application of this advanced display technology took the Expo as an opportunity to show the world the most cutting-edge achievements of Sony Corporation of Japan; in February 2006, Mitsubishi Electric of Japan Announced the successful development of a laser rear projection TV with a color gamut coverage of 135% NTSC and a contrast ratio of 4000:1, and plans to build a pilot production line, which is expected to be put into production around 2008. In March 2006, Seiko Epson Corporation of Japan announced a strategic cooperation with Novax of the United States to jointly develop laser display technology. It is expected to enter the home display market around 2012. Historically, Sony’s color TV display system and Citizen’s Seiko watches have been widely recognized around the world by taking advantage of the Olympic Games and have formed a century model of high-tech applications.
Current status of domestic laser display technologymy country has a very solid foundation in the research of laser display technology. Through the careful deployment of scientific programs such as the National 863 Program, a complete technology chain from core optical materials and devices, semiconductors and all-solid-state lasers to complete machine integration has been established, laying a technical foundation and a sound foundation for my country’s independent development of next-generation display technologies. Development Environment. During the National 863 Tenth Five-Year Plan, the Institute of Optoelectronics of the Chinese Academy of Sciences, under the leadership of President Cao Jianlin and the guidance of Academician Xu Zuyan, focused on the research of large color gamut and large screen laser display technology, and successfully developed 60-inch, 84-inch, 140-inch and 200-inch large-screen laser display prototypes, and related products have won many awards at domestic professional technology fairs and display technology exhibitions, and have been widely praised by the industry. On January 10, 2006, the result of the joint scientific and technological achievements appraisal of the Chinese Academy of Sciences and the Ministry of Information Industry was that "the overall technology is internationally advanced, and the color gamut coverage and other technologies have reached the international leading level", with a good research foundation. my country's patents account for 30% of the total number of patents in the world, involving the main key links of laser display, and have advantages in laser devices, shimming, decoherence and complete machine technology; among them, the bidding unit for this project owns more than 75% of domestic laser display patents , In the domestic laser display field, it is absolutely leading.
Basic principles of laser display technologyThe laser display technology uses red, green and blue lasers as the display light source. Compared with the original display technologies such as cathode ray tube (CRT), liquid crystal (LCD) and plasma (PDP), it has achieved a light source in the process structure of the display system. The major invention of upgrading and upgrading has achieved a major breakthrough in colorimetry. Because the laser is a line spectrum, the color saturation is high, and the color is bright; and because the laser spectrum is rich, you can choose to achieve a large color gamut display, so it can display more than twice the color of CRT, LCD and PDP, solving the display technology field for a long time. The unresolved problem of large color gamut color reproduction.
Therefore, laser display technology can reproduce natural colors most perfectly, and is the fourth-generation display technology after black-and-white display, color display, and digital display. The laser full-color display technology uses red, green, and blue lasers as the light source, and its working principle is shown in Figure 1.1: the red, green, and blue lasers are respectively incident on the corresponding light valve after beam expansion, shimming, and decoherence. Above, an image modulation signal is added to the light valve, and the modulated three-color laser is combined by the X prism and incident on the projection objective lens, and finally projected onto the screen by the projection objective lens to obtain a laser display image.
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