Object positioning method for a touch panel

• US 9,898,137 B2
• Filed: 05/17/2017
• Issued: 02/20/2018
• Est. Priority Date: 07/03/2013
• Status: Active Grant

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: Su, Tse Chung, Tsai, Ming Hung, Liao, Chi-Chieh
• Primary Examiner(s): BLANCHA, JONATHAN M
• Application Number:
  US15/598,226
• Publication Number:
  US 20170255333A1
• Time in Patent Office: 279 Days
• Field of Search: 345174
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

An object positioning method for touch panel is disclosed. In the method, an amount of sensing of a sensing signal can be detected and a sensing coordinate of an object can be obtained based on the detection. A positioning coordinate of the object can be locked in a point-locked mode when the amount of sensing of the sensing signal decreases continuously to be larger than a first threshold time and the amount of sensing of the sensing signal is smaller than a first sensing threshold value. Otherwise, the point-locked mode of the positioning coordinate of the object can be unlocked when the amount of sensing of the sensing signal is larger than a first sensing threshold value.

Claims

1. An object positioning method, used for a touch panel, the object positioning method comprising:

recording a positioning coordinate of an object;

acquiring a sensing coordinate of the object according to calculation of a sensing signal;

acquiring a motion estimation vector according to calculation of the positioning coordinate and the sensing coordinate;

determining whether a length of the motion estimation vector is smaller than a predetermined distance;

outputting the positioning coordinate, if the length of the motion estimation vector is smaller than the predetermined distance;

outputting the positioning coordinate and using a comparison result as comparing the length of the motion estimation vector with a threshold to update the positioning coordinate to a position of the positioning coordinate, if the length of the motion estimation vector is larger than the predetermined distance;

detecting an amount of sensing of the sensing signal;

locking the positioning coordinate of the object, when the amount of sensing of the sensing signal decreases continuously to be larger than a first threshold time and the amount of sensing of the sensing signal is smaller than a first sensing threshold value; and

unlocking the point-locked mode of the positioning coordinate of the object when the amount of sensing of the sensing signal is larger than a first sensing threshold value under a situation of the positioning coordinate of the object in the point-locked mode.

2. The object positioning method according to claim 1, wherein, in the step of updating position of the positioning coordinate, further comprising:

calculating an object movement vector of the object according to the predetermined distance and the motion estimation vector; and

updating the positioning coordinate to a position of sum of the positioning coordinate and the object movement vector,

wherein direction of the object movement vector is unit vector of the motion estimation vector, and magnitude of the object movement vector is that the predetermined distance subtracted by the length of the motion estimation vector.

3. The object positioning method according to claim 1, wherein, after step of outputting the positioning coordinate, returning to step of acquiring the sensing coordinate of the object according to calculation of the sensing signal.

4. The object positioning method according to claim 1, wherein, before step of recording the positioning coordinate of the object, further comprising:

detecting and confirming that the object touches the touch panel, wherein the touch panel is capacitive touch panel and the amount of change of capacitance of the capacitive touch panel is transformed to the sensing signal by a control circuit.

5. The object positioning method according to claim 1, wherein, after step of the length of the motion estimation vector being smaller than the predetermined distance, further comprising:

locking the positioning coordinate of the object.

6. The object positioning method according to claim 1, wherein, when the amount of sensing of the sensing signal decreases continuously, an average value of amount of sensing of N sample sensing signal for N time-points is served as the amount of sensing of the sensing signal, wherein N is a positive integer larger than one.

7. The object positioning method according to claim 1, wherein the threshold is the predetermined distance.

8. An object positioning method, used for a touch panel, the object positioning method comprising:

detecting an object moved on the touch panel and generating a plurality of sensing signals;

acquiring a sensing coordinate of the object according to each of the sensing signals;

acquiring a motion estimation vector of the object according to the sensing coordinates of the object according to the sensing signals;

detecting an amount of sensing of each of the sensing signals;

locking a positioning coordinate of the object when the amount of sensing of each of the sensing signals decreases continuously to be larger than a first threshold time and the amount is smaller than a first sensing threshold value;

updating the positioning coordinate of the object if a length of the motion estimation vector is larger than a predetermined distance.

9. The method according to claim 8, wherein, in the step of updating the positioning coordinate, further comprising:

calculating an object movement vector of the object according to the predetermined distance and the motion estimation vector; and

updating the positioning coordinate to a position of sum of the positioning coordinate and the object movement vector,

wherein direction of the object movement vector is unit vector of the motion estimation vector, and magnitude of the object movement vector is that the predetermined distance subtracted by the length of the motion estimation vector.

10. The method according to claim 8, further comprising:

recording the positioning coordinate of the object; and

outputting the positioning coordinate.

11. The method according to claim 10, wherein, before step of recording the positioning coordinate of the object, further comprising:

detecting and confirming that the object touches the touch panel, wherein the touch panel is capacitive touch panel and the amount of change of capacitance of the capacitive touch panel is transformed to the sensing signal by a control circuit.

12. The method according to claim 8, wherein, further comprising:

outputting the positioning coordinate if the length of the motion estimation vector is smaller than the predetermined distance, and

locking the positioning coordinate of the object.