Electroscopic information display and entry system with writing stylus
US4520357A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1982 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | Jul 23, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03545
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Information is written into a matrix-addressed electroscopic display by means of a writing stylus having a magnetic tip, utilized to attract a moveable plate electrode in a selected one of the display matrix cells. A capacitance detector, connected to sequential ones of the column electrodes of the display via a first multiplexer and to sequential ones of the row electrodes of the matrix display via a second multiplexer, detects the change in cell interelectrode capacitance caused by movement of the moveable plate electrode. The capacitance of each display cell is compared with the data for the output state commanded for that cell, to recognize input data sites programmed by the magnetic writing stylus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.