TV - Helium

How high definition TVs work:

There are different types of high definition TVs, and each work slightly differently.

* LCD

An LCD TV has a layer of liquid crystals between two layers of polarised glass. A backlight shines through the liquid crystals, and through colour filters to create a full colour image.

* Plasma

A plasma screen is made of tiny chambers of gas . When given an electric charge, they turn

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