How Plasma TVs Work, Home Audio Video : iPedia

We're all familiar with the common cathode-ray tube (CRT) technology that has been the backbone of television for decades. Inside each CRT, an electron gun similar to a laser fires a negatively charged beam of electrons at groups of gas molecules (the pixels), which causes them to change color; producing the pictures we see everyday. These televisions work well and produce very crisp pictures, but they are notoriously bulky and heavy. This is because as the screen gets larger, the electron gun must be moved farther back so that it has a good angle to hit every pixel with its beam. Thus, the larger the screen, the deeper the

Enter the plasma flat panel television. Arriving with the turn of the millennium, these televisions come in large, widescreen models that measure only 6 or 7 inches deep; a huge improvement over CRT. This dramatic change in shape results from individual transistor electrodes at each pixel. We no longer need the laser to hit every inch of the TV and, without the laser, manufacturers can eliminate most of the traditional bulk. The individual pixels in a plasma TV are composed of 3 fluorescent light cells: one red, one blue, and one green. The television produces pictures by varying the intensity of each cell to produce a unique color at every pixel without a laser. These lights give the television its name because they contain free flowing ions called plasma. The plasma, when hit with an electrical charge, produces light.

Traditional CRTs used the electron gun, or laser, to charge each pixel and create colored light. Plasma TVs instead have two sets of electrodes, one set

Depending on how the three sub-pixels are charged, we may see a greener, redder, or bluer shade. These primary colors may combine to produce one of a million different colors. If you think about the basics of this technology, each light cell is a miniature fluorescent light. This produces the brilliant, flicker-less picture we see when we watch a plasma television. Now you understand the technology behind the plasma flat panel television.

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A computer is a machine for manipulating data according to a list of instructions known as a program.

Computers are extremely versatile. In fact, they are universal information-processing machines. According to the Church–Turing thesis, a computer with a certain minimum threshold capability is in principle capable of performing the tasks of any other computer, from those of a personal digital assistant to a supercomputer, as long as time and memory capacity are not considerations. Therefore, the same computer designs may be adapted for tasks ranging from processing company payrolls...
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How Plasma TVs Work

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