Method of driving a liquid crystal display apparatus
US4186395A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1977 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Mar 1, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pulse applying method comprising applying a pulse train having a constant period to any one of a selection electrode and a control electrode which are opposed each other through a liquid crystal, while applying to the other a pulse train having a specific phase relationship with the said pulse train, whereby setting the total application time per unit period of the pulse applied between the selection electrode and the control electrode to two states, one being of the case where the liquid crystal operates and the other of the case where the liquid crystal does not operate, thus making the liquid crystal display unit indicative and non-indicative. A clear display with uniform contrast is obtainable. Moreover, a low-voltage drive is possible and the response speed is high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.