Digital liquid crystal electronic timepiece with color coded display
US4044546A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1976 |
| Grant date | Aug 30, 1977 |
| Priority date | — |
| Expiry date | Aug 10, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G9/126
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Instead of having separate digital display means for seconds, minutes, hours, dates and months, an electronic timepiece uses the same liquid crystal display and differentiates between seconds, minutes, hours, dates and months by displaying each in a different color. This makes it possible to have the timepiece smaller and at the same time have the individual digits of the display larger and hence more easily legible. The different colors of the display are obtained by using a plurality of driving voltages for the liquid crystal display device and switching circuitry for applying the different drive voltages to the liquid crystal device according to whether seconds, minutes, hours, dates or months is to be displayed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.