Indiglo is a brand name of Indiglo Corporation, solely owned by Timex for licensing purposes. Timex electroluminescent lamps, branded Indiglo, were introduced through Kmart in 1992 in the Ironman watch line. The technology is comparable to the Illuminator technology used by Casio.
Other watch models exhibit an Indiglo backlight that only lights up the numbers, rather than the entire LCD display, which is achieved by means of a specialized film that inverts the LCD transmissivity. The Timex Datalink USB uses this technology. Indiglo devices emit a distinct indigo or white or other color.
Indiglo has been used for other devices such as clock radios, electronic personal organizers, and nightlights.