Patent Document ID: 20040001048
Application ID: 10185056
Patent Status: 0

Claim One:
1. A method for indicating that a set of simultaneous contact points on a touch-sensitive screen contains a plurality of contact points, the method comprising: setting a multiple contact point discrimination threshold; setting a conductor on a first edge of the touch-sensitive screen to a first reference voltage; setting a conductor on a second edge of the touch-sensitive screen to a second reference voltage, the second edge being across the touch-sensitive screen from the first edge; taking a first measurement of a voltage associated with a conductor on a third edge of the touch-sensitive screen, the third edge being adjacent to the first and second edges; taking a second measurement of a voltage associated with a conductor on a fourth edge of the touch-sensitive screen, the fourth edge being adjacent to the first and second edges; comparing the multiple contact point discrimination threshold with a difference between the first and second measurements; and if the difference between the first and second measurements is greater than the multiple contact point discrimination threshold, then indicating that the set of simultaneous contact points contains a plurality of contact points.