Contact tracking and identification module for touch sensing

  • US 9,342,180 B2
  • Filed: 06/05/2009
  • Issued: 05/17/2016
  • Est. Priority Date: 01/26/1998
  • Status: Active Grant
  • ×
    • Pin
First Claim
Patent Images

1. A method of providing a control signal of a computing system including a touch sensitive surface, the method comprising:

  • obtaining first positions of multiple contacts corresponding to touch objects concurrently on or near the surface at a first time, the first positions including a first position of a first contact and a first position of a second contact;

    obtaining second positions of the multiple contacts corresponding to the touch objects concurrently on or near the surface at a second time after the first time, the second positions including a second position of the first contact and a second position of the second contact;

    determining a single rotational velocity based on the first position of the first contact, the first position of the second contact, the second position of the first contact, and the second position of the second contact; and

    providing the rotational velocity as a control signal of the computing system.

View all claims