The first television broadcast occurred in 1928, an historic event that was destined to change the world in unimaginable ways. This marked the beginning of the era of analog TVs.
The cathode ray tube, or CRT, is a version of the electronic vacuum tube. It was adapted for use in analog television sets. Therefore, analog TVs are often called CRT TVs.
A prototype analog TV display was conceived by Scottish scientist Alan Campbell Braun in 1908. The first commercially available TVs were the GE Octagon and the Baird Model C, both released in 1928.
Analog TVs work by charging the cathode ray tube with electricity. The CRT controls and directs this electricity toward the back of the view screen, which is coated with phosphor. The phosphor glows when exposed to the electrical charge, forming the basis of the picture on the television screen.
Analog TV Advances
The Sony Corporation made a gigantic step forward in analog TV in the mid-1990s with the introduction of the Trinitron and Trinitron Wega analog TV models. These televisions used a flat screen rather than the standard curved screen and as a result, they produced a much more uniform picture.
The electrical components inside an analog television can cause a life-threatening shock. Never attempt to repair an analog TV yourself. Even after it is unplugged, up to 40,000 volts of electricity can be present in certain components.
The Death of Analog TV
Analog TVs were eventually replaced by digital TVs. Digital TVs are thinner and lighter, and they deliver superior picture quality. A digital TV is required to view 720p and 1080i/p high-definition video content.
- Television image by genialbaron from Fotolia.com