Explain and differentiate among “Plasma”, “LCD” and “LED” television technologies.

(Civil Services Exam- 2010, 150 words)

Plasma TV contains a sheet of individual Plasma cell which gets activated due to electric current. The fundamental principle behind Plasma TV is the release of ultra violet photon when the excited electron returns to the normal state.

The LCD TV has liquid crystal which gets activated with the current. Since the panel has no light of its own, an external source is required for the lightening.

The principle of LED is similar to that of LCD which also has liquid crystal, the difference is that the lightening source in the case of former is light emitting diode.

On price front Plasma is the most economical technology while LED is the costliest. The performance of Plasma is better than LED and LCD in terms of motion and the image of Plasma TV remain good at almost all angles. On the other hand the lifespan of LED and LCD TVs are greater than that compared to Plasma technology.