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cathode ray tube
a. cathode b. conductive coating c anode d. phosphor-coated screen e. elecrtron beams f. shadow mask
In a cathode ray tube, the cathode is a heated filament (not unlike the filament in a normal light bulb). The heated filament is in a vacuum created inside a glass tube. The ray is a stream of electrons that naturally pour off a heated cathode into the vacuum.
Electrons are negative. The anode is positive, so it attracts the electrons pouring off the cathode. In a TV's cathode ray tube, the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode. This tight, high-speed beam of electrons flies through the vacuum 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.
advantages!
1. CRT tvs are comparatively heavier than the more modern tv systems. 2. CRT tvs are bulkier than more moderns sets, therefore take up much more room. 4. Magnetic fields directly affect the quality and function of CRT sets. 5. CRT tvs can never get bigger than 40 inches. 6. CRT tvs cannot be left running for long becase the phosphors in them can burn.
disadvantages
1. The price of CRT tv's are cheaper because of how long they have been around and because of the competitiveness of the prices of the new types of tv sets. 2. Have been proven to last longer than other types of tvs. 3. Excellent color saturation. 4. The convex screen provides a wider viewing screen.
CRT tvs, because of the competitiveness of pricing, are generally much cheaper than more modern television sets.
pricing.
