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- Posted January 25, 2011 at 11:23 pm
Microvision has reported that it has successfully integrated direct green lasers into some of its pico projector prototypes. This is an important step towards the further miniaturization of the pico projector modules and making them cheaper too. These lasers hold to key to simplifying the manufacturing process, which will in turn benefit the whole chain.
Direct green lasers are those lasers that produce green light natively, without any modifications to them. Green makes up one of the three primary colors that are required to produce a color image digitally — RGB (Red Green Blue). But current Pico projectors do this with red and blue lasers coupled with an infrared laser that is forced to produce green light. This is done through tweaking the laser in a way that forces it to reduce its wavelength (infrared has a longer wavelength than green, which is more towards the middle of the light spectrum) and thus produce green light.
The problem with this process is that it creates a lot of complications in the manufacturing process where a lot of components are held at high tension situations to make this work. This makes the modules bigger thanks to the extra components that are required. It also increases the costs involved. Hence, once direct green lasers are successfully incorporated into the whole thing, the pico projector modules will become both cheaper and smaller. Much like the rest of the products in the electronics industry.
Direct green lasers are actually a new phenomenon and at least five different companies have said that they are working on it. Due to the complexity of synthetic green lasers (those infrared lasers that are made to produce green light), only two manufacturers make then. The commercial availability is said to be between late 2011 and mid 2012.
Source: Micro Projector News
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