System and method for touch screen environmental calibration
US6456952B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 2000 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Mar 29, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0418
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method compensates for drift in electronic touch screens. A plurality of touch areas and drift areas are defined for a touch screen. From location coordinates generated by the screen, a ratio between detected touch hits in each defined touch area and detected touch hits in each corresponding drift area is computed. The computed ratio is compared to a calibration threshold to determine whether the number of touch hits in the drift area are excessive. If they are, a correction vector for all or a portion of the screen may be computed and used to adjust subsequent location coordinates or a calibration signal may be generated. The calibration signal may be a data message transmitted to a remote site to indicate a service call is required at the site of the touch screen and computer. Preferably, the system includes a location adjustor that determines whether the adjustment vectors for a plurality of keypad areas have a corresponding direction and magnitude. If they do, the location adjustor adjusts the definition of the touch and drift areas in the keypad memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.