# US 2017/0255333 A1 · Touch positioning method for touch panel

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- Number: US 2017/0255333 A1
- Document ID: US20170255333A1
- Status: Published application
- Kind: A1
- Application number: 15/598,226
- Filed: 2017-05-17
- Published: 2017-09-07
- Earliest claimed: 2013-07-03
- Assignees: Pixart Imaging Inc.
- Applicants: Pixart Imaging Inc.
- Inventors: TSE CHUNG SU; MING HUNG TSAI; CHI-CHIEH LIAO
- Web page: https://patentgrep.com/patent/US20170255333A1

## CPC

- G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment}
- G06F 3/04186: {Touch location disambiguation}
- G06F 3/03545: {Pens or stylus}
- G06F 3/044: by capacitive means
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## 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

### Claim 1

An object positioning method, used for a touch panel, the object positioning method comprising:
detecting an amount of sensing of a sensing signal; and
locking a positioning coordinate of an object 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.

### Claim 2 (depends on 1)

The object positioning method according to claim 1, further comprising:
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.

### Claim 3 (depends on 1)

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 amount of sensing of the sensing signal; wherein N is a positive integer larger than one.

### Claim 4 (depends on 1)

The object positioning method according to claim 1, wherein an amount of change of capacitance of the touch panel is transformed to amount of sensing of the sensing signal via a control circuit.

### Claim 5

An object positioning method, used for a touch panel, the object positioning method comprising:
recording a positioning coordinate of an object;
detecting an amount of sensing of a sensing signal;
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 length of the motion estimation vector is smaller than a predetermined distance;
outputting the positioning coordinate, if length of the motion estimation vector is smaller than the predetermined distance;
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.

### Claim 6 (depends on 5)

The object positioning method according to claim 5, 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.

### Claim 7 (depends on 5)

The object positioning method according to claim 5, 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.

### Claim 8 (depends on 5)

The object positioning method according to claim 5, 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.

### Claim 9 (depends on 5)

The object positioning method according to claim 5, 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.

### Claim 10 (depends on 5)

The object positioning method according to claim 5, 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.