The brand is owned by Indiglo Corporation, which is in turn solely owned by Timex, and the name derives from the word indigo, as the original watches featuring the technology emitted a green-blue light.
Timex introduced the Indiglo technology in 1992 in their Ironman watch line and subsequently expanded its use to 70% of their watch line, including men's and women's watches, sport watches and chronographs. Casio markets electroluminescent display technology under the brand names Illuminator and Foxfire.
Indiglo devices typically emit a distinct blue or white color, though some may emit different colors. Certain Indiglo models, e.g., Timex Datalink USB, employ a form of the technology that only lights the watch dial's numbers, rather than the entire dial.
Indiglo has been used for other devices such as clock radios, electronic personal organizers, and nightlights as well as for the luminescent paint on the hands of their analog watches — while making no distinction between this product and the electroluminescent watch feature.
- U.S. Patent 4,775,964
- How does an Indiglo watch work? at HowStuffWorks
- Overview of electroluminescent display technology, and the discovery of electroluminescence
- Electroluminescence, Edison Technology Center
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