Operation of the plasma screens

In the past years, the great majority of the televisions has been constructed around the same technology: The cathode ray tube (CRT). In a television with this model of screen, which at the outset were televisions of black and white, they used a device which it generated a negative particle electron  ray, within a great glass tube. The electrons excite extended phosphorus atoms at the end of the tube by the screen, which causes that the phosphorus atoms are illuminated. The image of the television is produced when illuminating different areas from the phosphorus cover with different colors from different intensity.

The cathode ray tubes usually produce hummings, vibrant images and some other disadvantages, like their size for example. If you want to increase the width of the screen in a CRT, also it is necessary to increase the length of the tube, to give the device that generates the electron ray, more space to reach all the corners of the screen. By this same one, a monitor CRT of many inches will weigh one ton and will occupy much space in a room.

Nevertheless, a new alternative appeared not much ago, and are the plasma screens. These televisions have wide, comparable screens to great monitors CRT but with the difference that has a thickness of about fifteen centimeters. If you have read our article on as a CRT in the main section of television works, then you understand the basic idea of a television or standard monitor. Based on the information of a video signal, the television ignites thousand of small called points pixels, with electrons of high power and distributing them by the screen. Combining the colors in different proportions, the television can produce all the phantom that compose the colors.

The basic idea of a plasma screen, is to illuminate small and fluorescent lights to form an image. Each pixel is formed by 3 fluorescent lights - a red light, a green light and a blue light. Like a television CRT, the plasmas varies the intensity of the different lights to produce a complete rank of colors.

What is plasma?

The central element in a fluorescent light is the plasma, a gas made of ions (loaded atoms electrically) and electrons (charged particles negatively). Under normal conditions, a gas is compound mainly of particles without load. This means that the individual atoms of the gas include equal number of protons and electrons. The loaded electrons negatively are synchronized perfectly with loaded protons positively, reason why the atom has a zero load.

If you introduce many free electrons within the gas when establishing an electrical voltage by means, the situation changes quickly. The free electrons collide with the atoms, causing that lose other electrons. With a missing electron, an atom loses the balance. A positive charge would already exist causing that is an ion.

In the plasma screens with a conventional charge circulating around their interior, the particles of negative load run quickly towards the area of positive charge of the plasma and vice versa. In these wild movements, the particles are continuously striking themselves to each other. These collisions excite the atoms of the gas in the plasma causing that release energy photons. The used atoms of xeon and neon in the plasma screens release to lights photonics when they are excited.

The plasma screen is formed of cells vertical ordinates in horizontal lines and columns, forming a species of grid. Each particular cell has gas that must be ionized, and for it loads of electrodes are sent that are intersectioned with the cells. It is done thousand of times in a fraction of second, loading each one of the cells in turns.

When the loads have been realised, an electrical charge passes through the gas in the cell, creating a loaded particle flux that stimulates gas atoms to release photons with ultraviolet rays. The photons interact with the phosphorus material that covers the internal wall with the cell. Each pixel is compound of three separated cells, each with different phosphorus colors, calls subpixels. Each sub-cell has the colors red, green and blue. These three colors are based together to create the final color of the pixel.

Varying the pulses of the flows before mentioned by the different cells, the intensity of each subpixel can be controlled, to create hundreds of combinations different from the three colors and to include all the phantom.

The main advantage of the plasma screens is that screens can be produced very fine material very great and wide using. When illuminating itself each pixel separately, the resulting image is very shining and of very good quality from any angle. The greater disadvantage of this type of screens continues being its price, although the slope of these prices is progressive and good supplies can already be found.