Laser TV- How Laser TV works
Laser television uses the laser technology which is the abbreviated form of Light Amplification of Stimulated Emission of Radiation. The basic functionality on which a laser works is the population inversion. The history of Laser Television traces into late 1960’s but this had more advantages over the normal Analog Television but cost wise it proves to be more costly than the Analog Television. The current television technology works on the basis of the human defective eye. Most of the compression standards work on the things which human eyes and ears cannot detect. It was also said that if laser could be used for transmission they can be used to show 10 million channels.
About DLP or Digital Light processing technology
The laser television works on the principle of rear projection display. This is achieved by using discharge lamps of very high intensity. The main technology behind this is very popularly known as DLP, which is the abbreviated form of digital light processing. DLP is the technology on which most of the video projectors around the world works with.
How Digital light processing Technology or DLP works, here is an insight
This is has a digital micro mirror device and this itself can be an external cavity doubled, inner cavity doubled lasers or may be a fibre lasers. There are few more types namely optically pumped semiconductor lasers and the other one is vertical external cavity surface emitting laser. For laser Tv mostly vertical external cavity surface emitting laser or simply VECSEL is preferred. This has two mirrors and there is a diode above these two mirrors. The good beam quality is combined with a better overall efficiency to make it the best. There Infra Red from one of the laser diode will be converted into Visible light using second harmonic generation technique. The digital micro mirror device receives the laser pulse which will be around 10 KHz frequencies. The reflection is reduced using optimization techniques which is made easy since the wave lengths are all already know.
Explaining more simply There are three different colored laser lamps which are red, green and blue. There is no Blue and Green commercialized Laser lamps available in the market. Whereas the red color lamps has been in the market for years together. They use second harmonic generation technique to convert the light ray in the infra red frequency region to visible spectrum wavelength. There were many companies that manufactured laser TVs. Mitsubishi being the latest brand to launch laser TV named Mitsubishi LaserVue TV, the cost of this television was $6999 when it was launched way back in 2008. The first company to come out with a laser TV was Schneider AG which presented the first ever prototype of the laser TV in the year 1993. But due to the financial crisis that Schneider faced they couldn’t commercialize their prototype. But it took another long thirteen years to get the first ever laser TV in the market which was done in the year 2006.
There are a lot of advantages in laser Television like its period of life is very long than the other available things in the market. Compared to the plasma TVs this uses only one fourth of the power. They are comparatively as slim as LCD TVs or even like plasma TVs. The cost of the Laser TVs is also half of that as the plasma TVs; their weight is also half of that of the plasma TVs. They doesn’t suffer the drawbacks that the plasma TV or LCD TV. The only drawback of the laser TV is that it is so costly compared to the analog TV. People said “Who will buy such a costly TV??” when LCD TVs were launched but what happened in the end was everybody bought it. The same thing will happen with laser TVs also. What concerns people is the quality and not the cost at which the quality comes with.