Displays, Electronic Meters

A seven-segment display (ssd), or seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot-matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters, and other electronic devices for displaying numerical information. The idea of the seven-segment display is quite old. In 1910, for example, a seven segment display illuminated by incandescent bulbs was used on a power-plant boiler room signal panel