Electronic watch and display device for such watch
US4183628A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1977 |
| Grant date | Jan 15, 1980 |
| Priority date | — |
| Expiry date | May 13, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S136/291
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electro-optic display device having a partially transparent display cell and a semi-transparent mirror located behind said cell and arranged to transmit light waves within a first wave length band and to reflect light waves within a second wave length band. An electro-optic component is located behind the semi-transparent mirror and operates in a third wave length band which overlaps at least partially the first wave length band. The electro-optical component may be a plurality of photo cells used for recharging an accumulator for the display device and/or a light source transmitted across a light plate of frosted or clear glass to illuminate the display cell. The display cell is illuminated by either the reflected light waves or the light waves emitted from the light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.