Weak current College】 【LED backlight technology: the most interesting projection direction】.

LED backlight technology: the most notable trend projection
After years of technology development and product marketing experience, use microdisplay projector product for the development of the technology is already very mature products, projection can be said to have in-depth our education, business and family entertainment, and many other large screen display field, there are all kinds of front projectors and rear-projection LCD, LCOS,-to-market, DLP is currently three main original micro display projection technology, in the ordinary civilian areas, its size is approximately 0.55 1.3 inches.
Projection display technology digitization, network, multimedia, the Internet has been achieved, at the heart of the projection products include lighting system comprising, separations and color processing system, projection lens, image signal processing circuit, microdisplay, etc. In the display, the current projection products have been fully able to meet the needs of the users.
Of course, expectations of the user for products is never-ending, users want to be more compact and portable, it's best to be able to conveniently carry to the projection of the application; and you want the product product more cost-effective, not only is the product's price, and the lamp service life of such components is also very important, after all, the current projection lamp price expensive;
In addition, as the core of projection products "," display results, of course need to be ensured in the application. These three major performance boost, although new products have been improved, but the "bottleneck" more and more obvious, because this projection optical system design are closely related, want to get a better product, you must have update more practical application of technologies and products.
The led light source technology, there has been a good development and application, can be said to be the most interesting new development in the direction of projection.
Today's market LED projector development how to
Application of led light source for projection products unveiled at the earliest, is in the public eyes may 2003 annual meeting of the SID to its compact form factor caused a great stir, however, was only conceptual product. Truly practical significance of the 2005 CES exhibition in January, five companies at the exhibition a Pocket projector LED light source, people began to really consider led light projection products in application advantages and weaknesses. And after a year of technology and product development, in January 2006 CES exhibition led light source has become the prominent highlights of the June 2006 issued a SID Symposium on large numbers of led light source, which marks the entry LED to a new stage of development.
Because of the importance of the results of two years and LED light source performance to improve performance in the core, it has better luminance, more power, and improve the beam angle and monochromatic light performance, thereby increasing the unit glow brightness. And the new product enables-DC dual-use and improved thermal management.
These developments enable the use of led light projection products in application performance more excellent, performance upgrade for the product's market provides the basis for development.
What LED projector technology advantage
LED light source with regard to the application, in the projector, the main purpose for the fuselage miniaturization has opened a new road. Because of the led light source volume is small, and has many advantages, so display technology is more suitable for the development of compact projector even original, enabling users to carry more "of the projection of" and "liberalization".
LED lighting for projection, not only life, but also changed the projector structure, due to reduced cooling requirements, and reduced optical system, heat dissipation and noise has better performance.
At present, the led light source main application and integration of original small-scale projection and pocket-sized minicomputer two projection products, projection and integrated small originals not made into independent models, its mainly and micro-display devices such as mobile phones, digital cameras, laptops, integrated with battery power, you can drop shadows around A4 paper or a standard letter size of images, easily share with others.
Pocket-sized handheld projector is a complete standalone models, the compact and lightweight, hand or you can easily pick up, carries conveniently, can be placed on the package, the future direction of business applications. It can be AC-DC dual purpose, projection screen can be greater than 17 inches, screen brightness 15 to 200 lumens, as technology evolves, effectiveness is also displayed.
What are the use of the market LED light source for projector
Led light projection products are now also has a few generations of development, from the earliest Mitsubishi and Samsung's "Pocket" projection products, although the overall design is impressive, but the brightness is not sufficient to support normal use. Subsequently appeared in EPSON and BenQ products is greater demonstrate design clever, EPSON product is equipped with two large fans to improve product stability, BenQ's LED projector you use their Smartphone, shaping the business image, but these two products of practicality is "afraid to flattered", even it is difficult to see a prototype of the show.
But leaving aside for the "third generation" LED projector products, including Mitsubishi's new product, the popularization of the Toshiba and LG products the personalized products in real applications give very good looking, Mitsubishi new LED projection products in previous generations of elevated brightness, pay attention to the screen presentation.
Toshiba's new products are more "product", the current domestic has launched, and the overall concept of the "more", equipped with professional Pack inside place a special projection folding screen, open, high-gain can supplement projector brightness, but this backpack is designed to exactly down the laptop and LED projectors, suitable for business people who use portable mobile.
The LG's newest LED projectors, has adopted the "chocolate"-style design, also in terms of effectiveness has improved, more appropriate fashion young group.
LED projector technology bottlenecks as well as the development direction
Overall, the LED projector after years of hairExhibition, there are already some product performance and technical accumulation, latest products have also been able to demonstrate to the satisfaction of the initial screen.
However, the LED projector still faces a maximum "peak" insurmountable, and that is the problem of insufficient brightness, in practical application is also very difficult to replace the bulb-type products. This is the present difficulties in the development of "period", in the lighting design of beam expansion theory, can be computationally ensure full use of solar energy.
When you display a symbol and lens decision soon sorts out matching LED light source, in the design process after a compromise adjustment, parameters can be recognised. Projection products the most intuitive of brightness depends on the brightness of the LED, the "most high brightness" still unable to meet the application conditions, is undoubtedly LED projector development of maximum "ceiling".
However led luminous efficiency progress rapidly in recent years, the white LED light-emitting efficiency has reached 20 ~ 30 lumens/W, highest reached 60 lumens projector/W, away from the actual requirements of optical efficiency gap is getting smaller and smaller.
Written in the last: at present, the LED lights in the rear-projection TV product applications already have very good practice, for example, Samsung, Sanyo, Chase, Epson, ya better, JVC and other companies have developed models for display, LCD, LCOS, DLP display components are used, rear projection screen of up to 55 inches, although there is also a problem of insufficient brightness, but overall the application is worth LED projector technology. LED light source will bring more perfect color performance, make the color reproducibility boost, while the small size, low power would allow the projector to achieve true anytime, anywhere, projection, and small size, long life, fast shutdown and other projector's ultimate demands through the led light source can be resolved, therefore, projection area of led light revolution or something we look forward to.