LCD Screen
A LED display is a flat panel display that uses an array of light-emitting diodes as pixels for a video display. Their brightness allows them to be used outdoors where they are visible in the sun for store signs and billboards
An LED screen is actually an LCD screen, but instead of having a normal CCFL backlight, it uses light-emitting diodes (LEDs) as a source of light behind the screen. An LED is more energy efficient and a lot smaller than a CCFL, enabling a thinner television screen.
Types of LCD
Passive
Each Pixel must retain it's state without a steady electric charge.
Scanned one pixel at a time.
Active
Electric Charged is stored between refreshes
Scanned one row at a time
