Question

differentiate between LCD , LED ,CRT and plasma ​

Answer 1

Answer:

Plasma televisions have excellent picture quality and use less electricity than traditional CRTs. The colors are very sharp and the televisions also display very deep blacks. ... liquid crystal display (LCD) TV technology, although LCD panels don't, by themselves, generate any light of their

Answer 2

Answer:

There was a time when all TVs contained a cathode ray tube (CRT) and, as a result, were bulky and heavy. CRT TV work by firing a stream of negatively charged particles, called electrons, at a phosphor screen. When an electron strikes a phosphor atom, the atom becomes excited and emits light of a certain colour, hence creating one picture element, or “pixel”, of a TV picture.

Explanation:

liquid crystal display (LCD) TV technology, although LCD panels don’t, by themselves, generate any light of their own. Liquid crystal molecules twist and untwist when a voltage is applied or removed, so they’re simply used to regulate the passage of light from a traditional light source. If light is allowed to pass through a particular pixel, the pixel is “on” and appears light on the TV screen; if not, the pixel is “off” and appears dark.