How Are Televisions Made?

You've probably wondered how televisions are made at some time. How do all those magical images and sounds that emanate from that box. Well, the actual reason isn't magical

Tube Televisions. These work using cathode ray tubes. Generally, they are made using a network of vacuum tubes that receive electromagnetic video and audio signals. These signals were converted from groups of electrons that are 'shot' by a separator and amplifier. The groups that carry the audio are sent to a speakers, amplifier, and demodulator. The video electrons are also amplified, and then sent to a sheet of glass, coated with phosphor and backed by aluminum. This is located right behind the glass screen of a television set, and displays pictures as the phosphor is exited. With the invention of transistors, tube televisions began to take up much less space, as the entire set could be controlled by PCB (printed circuit boards) and miniature circuit boards, which replaced all the wires, resistors, transformers, and coils.

Modern Day Televisions. Modern day TV's aren't made using cathode ray tubes, but "Plasma" or "flat" screens. These screens contain millions of phosphor gas filled cells. Phosphor gas is made up of neon, xenon and argon. These cells are pressed between two networks of metal electrons. One of these sets of electrodes acts as the beam or "addressing field" while the other acts as the receptor or "display field". Both sets of electrodes are padded with numerous layers of insulating material, that help manage electrons. The plasma cells and fields are enclosed in glass, while other screens have LCD projection systems. However, one thing they have in common is that they both use the excitement of phosphor gas to display images on the screen. Apart from this, tiny transistors are wired onto circuit boards, and are fitted in little crevices in the back of the television so they can be easily replaced, should one or more be defective.

Reference:

TV Inner Workings

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