What is the difference between LED and LCD? - Electronics

What is the difference between LED and LCD?

A Light-Emitting-Diode (LED) display generates light energy as current is passed through the individual segments. It refers to the backlight system used in many newer
LCD televisions and not the chips that produce the images.
A liquid-crystal display (LCD) controls the reflection of available light. Traditional LCD TVs are normally back lit by fluorescent bulbs.

LCD TVs and LED TVs work by blocking light. The following explains how they work-

-A solution of TN liquid crystals is inserted between two perpendicularly aligned panes of polarized glass. It is possible to manipulate the intensity of light as it passes through this crystalline matrix and out of the glass panel at the other end by twisting one of the panes wrt the other.

-Depending on the voltage of the electrical charge running through them, liquid crystals will untwist so that the intensity of light that can pass through the second polarized pane is affected.

-Fundamentally, these displays can switch between light states (where the liquid crystals are fully twisted) and dark states (where the liquid crystals are fully untwisted), or somewhere along the gray scale in between.

The following are the advantages of LEDs over LCDs-

-LEDs are longer lasting than fluorescent bulbs.

-LEDs are more energy efficient than fluorescent bulbs.

-LEDs give greater contrast and better image quality than LCDs.