Device in a time piece for feeding an electro-luminescent display
US4011557A · kind A · utility
5Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | May 13, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
It is known that an electro-luminescent display increases its light emitting efficiency with the current through it. Such a display in a watch run from a small battery, is fed by short impulses of high-intensity current by means of discharges from two capacitors which are alternately charged and discharged by transistor switches opened and closed by externally supplied impulses. The battery current is thus kept substantially constant and low. A series of digits or segments thereof, if used, may be fed in sequence with the impulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.