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The majority of TV's used today rely on something called, "Cathode Ray Tube". When compared to CTRs, LCDs and plasma displays are rare. The Cathode Ray Tybe: the 'cathode' is a heated filament. The heated filament is in a vauum created inside a glass 'tube.' The 'ray' is a stream of electrons that naturally pour off a heated cathode into the vacuum. Since the electrons are negative and the anode is positive, it attracts the electrons pouring off the cathdode. Withi the TV's cathode ray tube, the stream of electrons in focused by a focusing anode into a tight beam and then accelerated by an accelerating anode. This tight, high-speed beam of electrons files through the cauum in the tube and hits the flat screen at the other end of the tube. This screen is coated with phosphor which glows when struck by the beam.
THE CATHODE RAY TUBE
Disadvantages: Technology for the CRT is relatively old, so the TV's it comes with are usually big and bulky. The type of glass used for CRT's is usually heavy, wide, and relatively fragile. Has been blamed for multiple health issues.
The advantages of having a Cathode Ray Tube: The technology is more widely used, the cost is relatively low, it's low maintenence for the most part, and it's rather basic so it's easy to use.
prices for CRTs generally range from $100-$600.
