An LCD TV has liquid crystal between the display panel of the TV, which gets activated when an electric current is supplied to it. The LED TV works on the same liquid crystal platform, but light-emitting diodes (LED) are used as the back-light for this TV, while the normal LCD TV uses a CCFL back-light. A plasma TV works on a completely different platform. A plasma TV has a sheet of individual plasma cells, which get activated when electricity is passed to the TV.the Plasma and LCD technologies are completely different, while the difference between the LCD and LED is only the back-light, which they use.
Various debating points about these technologies: LCD vs LED vs Plasma
Debate Point #1: Contrast Ratio
Debate Point #2: Viewing Angle
Debate Point #3: Color
Debate Point #4: Motion
Debate Point #5: Power Consumption
Debate Point #6: TV Lifespan
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