Use of led light source lamp by solid class projector may be collectively referred to as LED projector. In addition to the separate use of mobile projection, including the part of the home front projection, commercial and household use cast in front of rear projection, even if the home front projection, commercial front projection and home rear projection of the very small, there are considerable sales.
January 2005 CES show in Las Vegas is the LED projection in the development process of the watershed. In the CES exhibition, the use of led light source lamp in front projection, rear projection and LCD TV full debut, led display as passive light emitting display lighting of tempting prospect. It is estimated that LED projection market size in 2006 will reach hundreds of thousands of units, 2007 will exceed one million units.
Show attractive prospects
LED projection generally contain three types of product: the first category that is mobile projector, using DC power supply, can be used individually and also easy to combine other mobile image information in the device; the second category is called portable projector, as home front projection and commercial size ratio before voting, mobile projectors, some products can be AC-DC-powered, used alone, the first and second category are front projector; the third class for back projection, including rear-projection TV sets and rear projection displays, use the AC power supply, individual use.
The second category, the third category is UHP (ultra high pressure gas discharge lamps) projection of the traditional advantages of the product, and the first class product is currently unique LED projection, is a new type of projection products. And UHP lamp LED projection, projection of solid light source lamp has a range of attractive advantages, including a long service life, large range of color reproduction, the use of high efficiency, low power consumption, conducive to small, lightweight and low cost.
In May 2003 in Baltimore international SID (society for information display) annual meeting, a Pocket led light source lamp projector prototype. Personal projection first became a hot topic of the exhibition, then it was predicted that "the small personal projection will change in the consumer electronics world. "Since then, LED projection constantly appear in the related exhibition, sometimes becoming the subject of the workshop.
January 2005 CES show in Las Vegas is the LED projection of the watershed in the development process, there are 5 companies featuring Pocket LED projectors, mostly prototype, also has a marked price of the product. The exhibits are annotated using battery power, output flux da 20lm ~ 30lm, you can cast a bright 20-inch screen. The exhibition also employs LED light source lamp of two rear-projection, projection engine output 80lm ~ 100lm, 34-inch rear-projection screen brightness more than 100cd/m2, and 50-inch rear-projection screen in the screen darker. There are several companies on display with LED backlight of the LCD TV. During the CES show, former cast, rear projection and LCD TV full debut, exerting force, together with the show with a LED as passive light emitting display lighting of tempting prospect.
The efficiency required to substantially increase the lumens
LED light solid projection to LED projection brings the advantages of the technology and economic performance, but compared with UHP projection, LED projection also exist three obvious shortcomings: a light of the led light source is subject to a substantial increase in output, the second is the projection lamp and projection engine design maturity is not high, the third is the market perception is just beginning.
Improve the efficiency of the LED is not enough to solve all LED projection. 2002 30 years ago, led lumens efficiency or electro-optical conversion efficiency, an average of 3 years of wind and rain increased twice, and forecast the growth trend can also be maintained for 10 years. LED lumens efficiency rapidly improve the driving force of all the industrial countries to save energy's basic policy, demand comes from non-projection light of greater market, such as automobile lights, traffic lights.
According to the forecast, 2006-2007, LED lights and UHP lamp will have considerable lumen efficiency. Since then, the LED light efficiency for growth remain considerable, may 2010 120lm/W, 2012 to reach 150lm/W, which is used for micro-display projection of UHP lamp efficiency can only be 70lm/W ~ 80lm/W.
Because the exact technical reasons, cannot therefore conclude that LED lamp will reach in a few years UHP lamp light output level, nor should we think LED projection in a few years will replace UHP projection. Projection lights from halogen lamps to metal halide lamps, to the mid-1990s, the gradual replacement of metal halide lamp UHP lamp, the mainstream of the vote before this century and micro-display rear projection has been used UHP lamp. From 2005 onwards, in a relatively small area of the display size, LED projection will challenge the UHP projection, both of which will go into complementary development stage.
Application development forecast
The calculation on three types of LED projection application development to make the initial forecast, while ensuring sufficient screen brightness, when such products will appear much display size (see table below).
Build LED projection industry chain
China has become the world's largest TV and monitor manufacturing base, but also new consumer mobile digital products of important manufacturing base. The Ministry of information industry and trade association has consistently supported the formation of a helping industry chain, many enterprises are the industrial chain on industry and enterprise development is essential.
Different display modes supporting industrial chain. Display account for flat-panel TV cost 60% to 70%, Chinese enterprises lack technology and productivity of the initiative, industry chain build greater difficulty temporarily. In LED projection industry chain, the need to import the image display devices accounted for only about 10% of the cost, in addition to supporting components, domestic recently has a solution, technical innovation and the intellectual space very big.
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