Coordinate detecting device for outputting coordinate data when two points are simultaneously depressed, method therefor and computer control device
US6255604A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1996 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | May 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04104
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In the coordinate detection of resistive film system, detection of the coordinates of simultaneously designated two points is made possible. On a touch panel composed of two conductive films, whether input is made in a point or simultaneously at two points is judged by a current monitor. Simultaneous inputs at two points decrease the apparent resistance of the conductive film, and can be detected by an increase in the current. If the input of a point is identified, the coordinate data of the input point are retained as latest coordinate data in a RAM. If simultaneous inputs at two points are identified, coordinate data are obtained from the coordinate data retained in the RAM and from the potentials in the x and y directions, obtained from two conductive films constituting a touch panel, through amplifiers, and are outputted, together with the coordinate data retained in the RAM, as the coordinate data of the two points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.