System and method for preventing detection of touch screen input data
US6630896B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 2000 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | May 16, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/83
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method obfuscates a reference voltage being applied to a touch screen to reduce the likelihood that location coordinates may be obtained from electrically coupling to the touch screen. The method is performed by applying a varying reference voltage to a first plane of a touch screen with a time of application duration being substantially less than a touch period and by measuring a voltage present on a second plane during a portion of the application duration of the voltage to the first plane. A system may include a controller for randomly varying the reference voltage level and coupling a reference source that generates the reference voltage to a first plane of a touch screen for an application period that is significantly less than the touch period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.