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14-01-2011, 09:06 AM
I'm Charls P John, Doing MSc.Electronics, I want details about "Laser TV" for my seminar and presentation. I have searched seminar and presentationproject and implimentations.com and not able to find details. Please give me a seminar and presentation report/details of Laser TV.......
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Joined: Sep 2010
14-01-2011, 09:33 AM
Lasers may become an ideal replacement for the UHP lamps, which are currently in use in project and implimentationion display devices such as rear project and implimentationion TV and front project and implimentationors. Current televisions are capable of displaying only half of the visible spectrum of colors.
The basic idea is simple: you put three lasers inside the TV (one red, one green and one blue) and then scan the beams across a rear-project and implimentationion screen using mirrors. By scanning fast enough you eliminate flicker. The lasers are so bright that you get a great image.
A laser TV requires lasers in three distinct wavelengths: Red, Green and Blue. While red laser diodes are commercially available, there are no commercially available green and blue laser diodes which can provide the required power at room temperature with an adequate life time. Instead frequency doubling can be used to provide the blue and green wavelengths. Several types of lasers can be used as the frequency doubled sources: fiber lasers, inter cavity doubled lasers, external cavity doubled lasers, eVCSEL's and OPSL's (Optically Pumped Semiconductor Lasers). Among the inter cavity doubled lasers VCSEL's have shown much promise and potential to be the basis for a mass produced frequency doubled laser.
Advantages offered by laser TV's are as follows:
- half the weight and cost of Plasma or LCD displays;
- less power consumption (just around 25% of the power required by plasma TV's);
- can be as thin as plasma LCD displays;
- a much wider color palette (twice the colors available in present-day HDTV's and about 90% of all the colors visible to the human eye);
- a 50,000-hour lifespan;
- no progressive degradation of the TV image with age (unlike LCD, CRT, and plasma TV's) since the full power output of the laser is maintained throughout its lifetime.
One reported disadvantage of laser TV is the probable safety risk posed by its use of high-power laser beams.
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