The digitalization, networking and multimedia interconnection of projection display technology have been realized. The core components of projection products include light source illumination system, color separation and color processing system, projection lens, image signal processing circuit and micro display device. In terms of display effects, current projection products are fully capable of meeting the needs of users. In recent years, LED light source technology has developed rapidly, and it has become more and more widely used in lighting, home appliances, IT products, and industrial equipment, which not only improves the performance of products, but also contributes to energy saving and environmental protection. For the projector, its current clarity is not enough, the environment is high, and it needs to be improved when entering the home. And now that TV technology is mature, 3D TVs are already on the market, which is not a small impact on the projector market. However, with the application of LED light sources on projectors, the popularity of projectors will be greatly accelerated.
With the development of LED light source technology, the development of LED projectors is also extremely rapid. With the development of projector technology, projectors are further becoming smaller. Ultra-portable projectors are popular with people because of their small size and convenience. Under these conditions, many projector manufacturers attach great importance to the development of compact projectors, and are scrambling to produce an ultra-portable projector with LED light source.
How is the development of LED light source projectors on the market today?
The projection product using LED light source was first unveiled in front of the public. It was at the SID annual meeting held in May 2003. It caused great repercussions with its compact body. However, it was only a concept product. What is really practical is that at the CES show in January 2005, five companies also exhibited pocket projectors with LED light sources, and people began to really consider the advantages and weaknesses of LED light source projection products in application. After one year of technology and product development, the LED light source became a prominent highlight at the CES show in January 2006. A large number of LED light source papers were published at the SID seminar in June 2006, marking a new stage of LED development. As a result of the emphasis, the performance of LED light sources has been improved in the past two years. In terms of core performance, it has better luminosity, greater power, and improved illuminating angle and monochromatic luminescence performance, thereby improving the unit illuminance. And the new product realizes both AC and DC, and improves thermal management.
These developments have made the projection products using LED light sources more excellent in application performance, and the performance improvement has also provided the basis for the market development of the products.
What are the technical advantages of LED light source projectors?
The application of LED light source, in the projector, the most important significance is to open up a new path for the miniaturization of the fuselage. Because the LED light source is small in size and has many display technology advantages, it is more suitable for developing compact projectors and even originals, so that the user's projection is more "contained" and "liberalized".
LEDs are used for projection illumination, which not only increases the lifetime, but also changes the structure of the projector. Because the heat dissipation requirement is reduced and the optical path system is shortened, the heat dissipation and noise are better.
At present, LED light source is mainly used in the application of integrated small projection originals and pocket-sized minicomputers. The integrated small projection originals are not made into independent models, and are mainly integrated with micro display devices such as mobile phones, digital cameras and notebook computers. Together, battery-powered, you can project images of about A4 or standard letter size for easy sharing with others. The pocket-sized handheld projector is a complete and independent model. It is small and light, and can be easily picked up by one hand. It is easy to carry and can be placed in a file package. The future development direction is business applications. It can be used for both AC and DC. The projected picture can be larger than 17 inches, and the screen brightness is 15 to 200 lumens. With the development of technology, the display effect is still increasing.
Technical bottleneck and development direction of LED light source projector
Overall, the LED light source projector has undergone several years of development, and now has a certain product performance and technology accumulation, the latest products have been able to show a satisfactory picture.
However, the LED light source projector still faces the biggest "insurmountable" peak, which is the problem of insufficient brightness, and it is difficult to replace the bulb type product in practical use. This is also the main reason why it is currently in the “difficult period†of development. The important beam expansion theory in lighting system design can ensure the full utilization of light energy through calculation. After the display component and lens are determined, the matching LED source can be quickly selected, and the parameters can be confirmed after a compromise adjustment during the design process. The brightness of the projection product is most intuitively dependent on the brightness of the LED. At present, the "highest brightness" still cannot meet the application conditions, which is undoubtedly the biggest "ceiling" of LED projector development.
However, the luminous efficiency of LED has been progressing rapidly in recent years. At present, the luminous efficiency of white LED has reached 20-30 lumens/W, and the highest has reached 60 lumens/W. The difference in light efficiency from the actual requirements of the projector is getting smaller and smaller.
At present, LED light sources have been well practiced in the application of rear projection TV products. For example, Samsung, Sanyo, Chase, Epson, Ajia, JVC and other companies have exhibited models, LCD, LCOS, DLP. Display elements are used, the rear projection screen can reach 55 inches, although there are also problems of insufficient brightness, but the overall technical application is worthy of reference by LED projectors. The LED light source will bring more perfect color performance, which will greatly improve the color reproducibility. At the same time, the compact size and low power consumption will enable the projector to realize real-time projection anywhere, and the projection of small size, long life and fast shutdown. The ultimate appeal of the machine can be solved by LED light source. Therefore, the LED light source revolution in the projection field is worthy of our eagerly awaited.
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