Controller, system and method for identifying a number of interactions with a computer input area

• US 7,825,902 B2
• Filed: 03/31/2005
• Issued: 11/02/2010
• Est. Priority Date: 03/31/2005
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Chen, Deng-Peng, Wong, Chee-Heng, Tan, Wee-Sin, Lee, Kai-Koon
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Shapiro, Leonid
• Application Number:
  US11/096,064
• Publication Number:
  US 20060221062A1
• Time in Patent Office: 2,042 Days
• Field of Search: 345/173, 345/175, 345/179, 178/18.01, 178/20.01
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/04886 by partitioning the display area of the touch-screen or the surface of the digitising tablet into independently controllable areas, e.g. virtual keyboards or menus
• CPC Class Codes: H03M 11/26 using opto-electronic means

Abstract

Disclosed is a method for identifying a number of interactions with a computer input area defined by at least first and second intersecting sets of detection paths. First, indications of which of the detection paths are affected by the interactions are received. Then, for each of the detection path sets, the set'"'"'s indications of affected detection paths are parsed to identify up to N extents of adjacent, affected detection paths (N≧2). A controller having logic to implement the method, and a system incorporating a control system that implements the method, are also disclosed.

Claims

1. A method of operating a touch pad, the method comprising:

providing a first set of detection paths comprising pairs of adjacent detection paths aligned in a first axial direction of the touch pad;

providing a second set of detection paths comprising pairs of adjacent detection paths aligned in a second axial direction of the touch pad, the second axial direction intersecting the first axial direction;

generating a first set of coordinates corresponding to the first axial direction, the first set of coordinates identifying at least one pair of adjacent detection paths aligned in the first axial direction that is affected by a first touch upon the touch pad;

generating a second set of coordinates corresponding to the second axial direction, the second set of coordinates identifying at least one pair of adjacent detection paths aligned in the second axial direction that is affected by the first touch upon the touch pad;

parsing the first and the second set of coordinates for identifying the first touch upon the touch pad;

further using the first set of coordinates for identifying additional pairs of adjacent detection paths aligned in the first axial direction that are affected by a second touch and a third touch upon the touch pad; and

further using the second set of coordinates for identifying additional pairs of adjacent detection paths aligned in the second axial direction that are affected by at least one of the second touch or the third touch upon the touch pad.

2. The method of claim 1, wherein the third touch is masked along the second axial direction by the second touch.

3. The method of claim 2, wherein as a result of the masking, the identified pairs of adjacent detection paths aligned in the first axial direction is greater in number than the identified pairs of adjacent detection paths aligned in the second axial direction, and further wherein the first set of coordinates is correlated with the second set of coordinates for identifying the third touch.

4. The method of claim 3, wherein the correlation comprises correlating multiple pairs from the first set of coordinates with one pair from the second set of coordinates.

5. The method of claim 4, wherein the one pair from the second set of coordinates is a last identified pair in the second set of coordinates.

6. The method of claim 1, wherein the first axial direction is a horizontal x-axis and the second axial direction is a perpendicular y-axis of the touch pad.

7. The method of claim 1, wherein the first axial direction intersects the second axial direction non-perpendicularly.