There are many bulky projectors on the market already that can project HD images. However, those “HOT’ projectors generate a lot of heat while working. The majority of them are DLP-based projectors from TI. In the world of green-energy expectation, people are looking for more environment-friendly solutions.
Laser-based pico projector stands out from the competing solutions. Here are the major advantages of laser-based pico projector:
(1)Infinite focus : No matter how far it is, or even on the curve surface, you can always see the image clearly. In addition, The infinite focus would come in handy for projecting on layered scrim/fabrics/plastics. It would allow your projection to pass through multiple layers of semi-transparent material, and display a focused image on each layer.
(2)Power consumption : According to CNET, the average power required for PLASMA and LCD display are as follows:
Average PLASMA: 301 watts
Average LCD (standard): 111 watts
Average LCD (LED): 101 watts
So the power consumption ratio of PLASMA to LCD is roughly 3:1
According to wikipedia :
Laser display requires around 25% of the power required by plasma displays.
Therefore, the ratio of laser display to PLASMA is 1 : 4.
(Reference : http://en.wikipedia.org/wiki/Laser_video_display)
In summary, the ratio of laser display : PLASMA : LCD = 3 : 12 : 4
Laser display only need about 75% of what LCD display requires.
(3)Color Gamut : About twice as rich as LCD display. LCD covers about 40% of the color gamut while laser display covers 90%.
(Reference: http://en.wikipedia.org/wiki/Laser_video_display)
(4)Size : Considering the path to HD (High Definition) for pico projector, the scanned laser projector paradigm provides a path forward to higher-resolution projectors without growth in size.
Unlike fixed pixel-based projector technologies—in which increased resolution means growth in the number of pixels in the array— compared to the single-pixel, single-scan-mirror nature (such as Microvision’s PicoP scan- mirroring engine) remains the same, even as the resolution of the projected display increases.
The major disadvantage is the cost. There are three R,G,B color lasers needed for the laser display. Currently the bottleneck is the “green laser”. As the direct-emitting green laser (DGL) diode on the horizon, companies such as Sorra(Kaai), OSRAM, Nichia and Sumitomo SEI are the most advanced players when it comes to direct-emission green laser diodes. Production samples are available from 2 sources according to Microvision. Those samples were successfully integrated into Microvision PicoP engine.
Soraa's lasers convert about 2% of input electricity into green light. "Our feeling is you need 8% efficiency for commercial success," says VP Paul Rudy. Soraa is aiming for 10% within a year, he says.
Once the performance requirement (WPE : Wall Plug Effencicy, percentage of power conversion from electrical to optics) reaches the double digit. The mass production will follow.
Let’s keep an eye on the progress of Sorra as it expects ‘substantial performance improvements’ in the coming months.
(See the reference link : http://www.ic-marketplace.com/2010/11/non-polar-nitride-boost-to-blue-and-true-green-laser-diode-performance.html)
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