Electrical display elements for displaying multiple different conditions
US5666129A · kind A · utility
5Cited by
3References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1994 |
| Grant date | Sep 9, 1997 |
| Priority date | — |
| Expiry date | Jul 6, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B5/36
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A pair of electrical display elements, LEDs, is driven by a three-state buffer driver circuit. The LEDs have associated current-limiting resistors. The driver circuit applies different selected voltage levels at different selected predetermined frequencies to the LEDs. By having two predetermined frequencies to a pair of LEDs, there can be exhibited at least five different display conditions from the pair of LEDs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.