Light-emitting diode

Light-emitting diode (LED) is a type of that emits light when current passes through it. Depending on the material used the color can be visible or. LEDs have many uses, visible LEDs are used as indicator lights on all sorts of electronic devices and in moving-message panels, while infrared LEDs are the heart of remote control devices.

Usage by Apple
Early LCD displays used in the 1990s by the first Macintosh Portable and PowerBooks from Apple Computer featured ing. Starting with its iPod line, Apple began to adopt more energy-efficient LED backlighting in what were referred to as LED displays, despite still also using active matrix LCD technology. Apple co-founder Steve Jobs stated a goal to switch to LED backlighting across its product line to reduce the use of toxic chemicals. The MacBook Air and LED Cinema Display, both released in 2008, were the first notebook and external monitor from Apple to use LED backlighting. Starting with the original Apple Watch in 2015 and then the iPhone X in 2017, Apple has started to implement newer OLED screens.