CRT Televisions

Cathode Ray Tube (CRT) Technology:

· A cathode and a pair or more of anodes

· A phosphor-coated screen

· Inside a tube there is a conductive coating used to soak up the electrons that gather along the other end of the tube where the screen is

· A beam is created and then directed by steering coils, which are copper coils wrapped around the tube

· By controlling the voltages of the coils, the electron beam can be positioned at any point on the screen

Basically:

A gun fires a beam of electrons inside of the glass tube. This beam of electrons excite phosphor atoms along the end of the tube, causing them to light up. Images are then produced by lighting up different parts of the tube (screen) and at different intensities.

The CRT television breaks up each image into 480 lines. These lines create what is called an interlaced image as all the even-numbered lines are drawn followed by all the odd-numbered lines. An image can be seen because these lines are drawn so quickly. Standard televisions are also known as 480i because of the 480 interlaced lines that make up the image.

Broadcasting:

CRT or Standard televisions are broadcasted over the air with an analog signal, making it susceptible to interference.

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http://www.onsemi.com/PowerSolutions/content.do?id=15046

http://grownupgeek.com/hdtv-explained

http://electronics.howstuffworks.com/tv4.htm