Method of multiplexing liquid crystal displays
US4121203A · kind A · utility
25Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1977 |
| Grant date | Oct 17, 1978 |
| Priority date | — |
| Expiry date | Mar 11, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G9/122
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid crystal display is multiplexed by the digit input being driven between a first and second voltage level and the segment input being driven between the second and a third voltage level. The difference between the first and third voltage level is sufficient to activate the liquid crystal device. For AC liquid crystal displays, a polarity reversal circuit, driven by a low frequency signal, is included for both the digit input and the segment input to cause the digit input to vary between the second and third voltage level while the segment input varies between the first and second voltage level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.