Capacitance-variation-sensitive touch sensing array system
US4733222A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Apr 18, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2017/9613
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A capacitance-variation-sensitive touch sensing array system includes an array of electrodes where each electrode is a connected series of conductive tabs and forms either a row or a column of the electrode array; an array of drive lines where each drive line is capacitively coupled to a plurality of the electrodes; a drive signal generator for applying alternating signal packets to the drive lines; an array of sense lines where each sense line is capacitively coupled to a plurality of the electrodes so that signals are derived from the electrodes when drive signals are applied to the drive lines. The number of electrodes is equal to the product of the number of drive lines and the number of sense lines. Based on values derived from signals on the sense lines, a microprocessor provides information associated with touch by an operator. The array of electrodes may be configured so as to result in a touch-actuated keyboard where the number of keys is equal to the product of the number of row electrodes and the number of column electrodes; or the array of electrodes may be configured so that finger touch position in a single large touch responsive area can be sensed and processed for u…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.