How does the television work...

We turn to the section How it works... to speak about the functioning of the television. The silly box, since they name it some, takes with us about 50 years, but his first steps happened it does more than 100. From these first steps with the Nipkow disc until our days with the sophisticated screens SMELL there has been a long trip, and obviously we are not going to speak about all the contributions that the science has done to improve the television, but yes that we are going to treat two models: the television CRT and the television of plasma.
The television CRT (initials in English of Pipe of Cathode Beams) it is the first one that many of the readership will identify with the television "of the whole life". This gigantic box with a thick screen of crystal and that, occasionally, if the sign was going away he was managing beating him in the side street. The same technology was applying itself also for the monitors of computer (they keep on existing but less and less) so this explanation is extensible to monitors.

Inside this type of television there is a device called pipe of cathode beams (we will be quick like CRT) which functioning we are going to try to explain simply. The CRT is composed on different parts as we can see in the top figure. We have to the left a cannon of electrons (cathode) that is throwing them continuously against the screen, to the right. To half of the figure there can be seen a few bobbins that work as magnet to focus and to direct the electron to the point of the screen that we are interested in. To obtain this also one is provided with several plates. The screen is a layer of phosphorus that is illuminated on having received the impact of the electron.
Seen this way perhaps it is a little complicated to do an idea to him so we are going to mount ourselves in an electron and do the whole process. Everything begins when it departs from the electrons cannon. Of beginning his trip it is already focused and directed to the little to the screen thanks to the bobbins and the plates. This first electron will go away direct to the left top corner where there is a small pixel. The pixel is composed of three different areas: red, blue and green. Depending on the intensity that applies him to itself to each of these three areas we will see on the screen a pixel of a color or other.
Now then, this is only a pixel, we can only refill the millions that the screen has. The following electron will continue the same way that should be safe for a small modification that will take him to the position of the contiguous pixel; the first horizontal pixels tier being refilled thus. Realizing the same process for the rest of tiers the image is obtained finally. All this process realizes at a major speed that the one that the eye can appreciate and therefore it seems that we see a completely animated image when really what appears is a set of pixels that freshen up several times per second, what is known like frames for second (fps).
After knowing the functioning of a screen CRT let's go on to the plasma screens. These screens are already more modern, although the basic functioning is not very different from that of the CRT. How we can see in the low scheme it is a question of a counterfoil of small blocks or cells of color between two glass walls. Every combination of 3 colors, which are red, blue and green as in the CRT, they form also a pixel of the image. Now we do not have a pipe of cathode beams if not that the mechanism to produce the photons (light) is lightly different.

Inside the colors cells a noble gas is confined as it can be the xenon, the neon, or the helium, which is ionized to produce light. The way of ionizing it is to apply a potential difference to him using the electrodes that exist ahead and behind every block. Thus in the gas there can appear an electric current that, on having come to the phosphorus of the cells, produces a photon of the certain color. Thus applying a potential difference to the set of three cells that shape the pixel million colors can be generated with relative facility. After all, this method well can be alike how a fluorescent lamp works, but we leave that for another day.
Multitude of different screens exists with funcionamientos more or less sophisticated, but I believe that with these two, which perhaps are the most well-known, it is sufficient. Therefore not at all more up to the next delivery of How does it work....
Greetings ;)
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