Touch system with track detecting function and method thereof

• US 9,619,072 B2
• Filed: 11/14/2011
• Issued: 04/11/2017
• Est. Priority Date: 08/30/2011
• Status: Expired

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: Lee, Yi-Fang, Lin, Yao-Hsuan
• Primary Examiner(s): Davis, Tony
• Application Number:
  US13/295,098
• Publication Number:
  US 20130050100A1
• Time in Patent Office: 1,975 Days
• Field of Search: 345170-174
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184

Abstract

A touch system with track detecting function includes a touch pad for sequentially sensing a plurality of positions of an indication object at a plurality of moments in order to detect a track of the indication object on the touch pad, and a processor for continuously generating motion vectors according to the track of the indication object on the touch pad, for generating a candidate motion vector according to at least one motion vector, and for nonlinearly generating a target motion vector according to the candidate motion vector in order to move a target shown on a display panel. Each of the motion vectors represents a difference between a position of the indication object and a next position of the indication object.

Claims

1. A method for controlling a touch system, comprising:

sensing a track of an indication object on a touch pad;

continuously obtaining motion vectors according to the track of the indication object;

generating a candidate motion vector by summing a plurality of unweighted motion vectors, and nonlinearly generating a target motion vector according to the candidate motion vector;

moving a target shown on a display panel according to the target motion vector, wherein a displayed track over which the target is moved on the display panel represents a smoother version of the track of the indication object on the touch pad; and

when the candidate motion vector is smaller than a predetermined value, determining the indication object being on any area of the touch pad stopped moving, and continuing to move the target along a direction of the candidate motion vector;

wherein each of the motion vectors represents a moving distance and a moving direction from a position of the indication object to a next position of the indication object, and the indication object is on the touch pad of the touch system.

2. The method of claim 1, wherein nonlinearly generating the target motion vector according to the candidate motion vector, comprises:

converting the candidate motion vector to the target motion vector according to a nonlinear function.

3. The method of claim 1, wherein when the candidate motion vector is smaller than the predetermined value, determining the indication object being on any area of the touch pad stopped moving, and continuing to move the target along the direction of the candidate motion vector comprises:

when the candidate motion vector is smaller than the predetermined value, continuously moving the target along the direction of the candidate motion vector at a predetermined speed;

wherein the predetermined speed is directly proportional to the magnitude of the candidate motion vector.

4. The method of claim 1, further comprising determining whether the indication object is still on the touch pad.

5. The method of claim 4, wherein determining whether the indication object is still on the touch pad comprises:

when determining the indication object not on the touch pad, moving the target according to the target motion vector, and then moving the target in a predetermined time.

6. The method of claim 4, wherein determining whether the indication object is still on the touch pad comprises:

when determining the indication object not on the touch pad, moving the target according to the target motion vector, and then moving the target with a decreasing speed from an original speed when moving the target.