Light-emitting diode

File:Circuit symbol--Light-emitting diode.svg

Circuit diagram symbol for an LED

A light-emitting diode or LED is a form of diode that emits light. In relation to keyboards, LEDs are used to provide backlighting and for lock LEDs. LEDs are also used in mice and trackballs both in opto-mechanical sensing (using infrared LEDs) and in pure optical sensing (typically visible spectrum LEDs).

Gallery

• 
  LED fitted to a Cherry MX switch
• 
  Lock LEDs on a Filco keyboard
• 
  Windowed lock LED key on a Cherry G80-9013
• 
  "Gold" LED-backlit Deck 21-key numeric keypad
• 
  Bare LEDs on a Cherry G84-4400 controller board
• 
  LEDs and corresponding plate holes in a Tulip ATK 030244
• 
  LEDs in a Burroughs Opto-Electric keyboard; these form part of the switching mechanism
• 
  Red LEDs in an Acorn BBC Microcomputer keyboard
• 
  Fujitsu Peerless slider with LED slot, and corresponding windowed keycap
• 
  Xiang Min KSB-LE switch with LED illuminated