LED showed a sharp angle projection

Using LED solid-state light source of the projector can be referred to as LED projector. In addition to the use of mobile projection alone, but also includes some of the pre cast household, commercial front projection and household rear projection, even if the former home investment, commercial and domestic investment in front projection accounted for a small share, but also a considerable sales. January 2005 Las Vegas CES exhibition called LED projection in the development process of watershed. In the CES exhibition, the use of LED light source before the cast, rear projection and LCD TV debut, together with LED as a passive light-emitting display lighting source of attractive prospects for development. It is estimated that the LED projection market size in 2006 will reach hundreds of thousands of units in 2007 will be more than one million units.

Show attractive prospects for development

LED projection generally consists of three categories of products: the first category is the mobile projector, the DC power supply, can be used alone or in combination for other mobile devices in the image information; the second type is called a portable projector, as household and commercial before the vote before the vote, size ratio of mobile projector, some products can be AC and DC power supply. Used alone, the first and the two is the first projector; third is the back of the projector, including rear projection TVs and rear projection display, the AC power supply, used alone.

The second category, the third category is UHP (ultra high pressure gas discharge lamp) projection of the traditional advantages of products, and the first class of products is currently unique to the LED projection, is a new type of projection products. Compared with the UHP projection lamp, LED light solid projection has a series of attractive advantages including long service life, range of color reproduction, high light utilization efficiency, low power consumption, easy for miniaturization, lightweight and low cost etc..

May 2003 held in Baltimore, the international SID (information display Society) annual meeting, there is a pocket LED light source projector prototype. Personal projection for the first time to become a hot topic of the show, then it was predicted that the small personal projection will change the consumer electronics world." Since then, the LED projection continues to appear in the relevant exhibition, and sometimes become the topic of the seminar.

January 2005 Las Vegas CES exhibition called LED projection in the process of development of the watershed, there are 5 companies on the display pocket LED projector, most of the prototype, there is a marked price of the product. Most of the exhibits indicate the use of battery power supply, the output flux of 20lm ~ 30lm, you can cast a bright 20 inch screen. The exhibition also has two rear projection using LED light source, said the projection engine output 80lm ~ 100lm, a 34 inch rear projection screen brightness of more than 100cd/m2, while the rear projection screen of 50 inches darker. There are several companies have exhibited the use of LED backlight LCD tv. In the CES show, before the vote, rear projection and LCD TV debut, together with force, together with LED as a passive light-emitting display lighting source of attractive prospects for development.

Lumen efficiency needs to be improved

LED solid projection light source lamp have the technical and economic performance advantages to the LED projection, but compared with the UHP projection, LED projection also has three shortcomings: one is obvious LED light source light output is greatly improved, the two is the design of projection light source and projection engine maturity is not high, the three is the market perception has just begun.

Improving the efficiency of LED is the precondition to solve all the problems of LED projection. In the 30 years before 2002, the lumen efficiency of LED or the efficiency of electro optic conversion increased by an average of about 2 times every 3 years, and the growth trend is expected to be maintained for another 10 years. The driving force of the rapid increase of LED lumen efficiency is the basic national policy of energy saving in all industrial countries, and the demand comes from the larger market of non projection light source, such as automobile lamp, traffic signal lamp.

It is predicted that from 2006 to 2007, LED lights and UHP lights will have considerable lumen efficiency. Since then, the growth of LED lamp efficiency is still very large space, it is possible to reach 120lm/W in 2010, reached 150lm/W in 2012, while the UHP display for micro projection efficiency can only be 70lm/W ~ 80lm/W.

Due to the exact technical reasons, it can not be considered that the LED projection lamp will be in a few years to reach the level of the UHP projection lamp light output, it should not be considered a few years after the LED projection will replace the UHP projection. Projection lamp from halogen lamp to metal halide lamp, to the middle of the last century after the mid 90s, UHP lamps gradually replace the metal halide lamp, the mainstream of the century before the cast and micro display rear projection have been using UHP lights. From the beginning of 2005, in the relatively small size of the display area, LED projection will challenge the UHP projection, the two will enter the complementary coexistence stage of development.

Application development forecast

After the calculation of the three types of LED projection application development to make a preliminary prediction, at the same time to ensure adequate screen brightness, when the product will have a large display size (see table below).

Construction of LED projection industry chain

China has become the world's largest TV and display manufacturing base, but also an important manufacturing base for new consumer mobile digital products. Ministry of information industry and industry associations have always supported the formation of the industry chain, many companies are also very important to the development of the industry chain and industry.

Different display modes of supporting industrial chain situation is different. Display devices accounted for 60% to 70% of the cost of flat-panel TVs, Chinese companies have no technology and production capacity of the initiative, the construction of the industrial chain is temporarily difficult. In the LED projection industry chain, the need for imaging display imports accounted for only about 10% of the cost of the parts, in addition, recently had a solution possible space to carry out technological innovation and has independent intellectual property rights