Method and device for position detection

• US 20110084931A1
• Filed: 10/08/2010
• Published: 04/14/2011
• Est. Priority Date: 10/09/2009
• Status: Active Grant

• Current Assignee: eGalax_eMPIA Technology Inc.
• Original Assignee: eGalax_eMPIA Technology Inc.
• Inventors: Lee, Cheng-Han, Ho, Shun-Lung, Tang, Chi-Hao, Chang, Chin-Fu
• Granted Patent: US 9,689,906 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G01R 27/2605 Measuring capacitance capacitive sensors G01D5/24
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

The method and device for position detection are disclosed. Corresponding to a first touch related sensing information, a second touch related sensing information is acquired for determining at least one position. Each position is used separately for determining the position of a centroid according to the first touch related sensing information or the second touch related sensing information.

Claims

1. A method for determining centroid positions, comprising:

obtaining a first touch related sensing information;

obtaining at least one position;

determining a corresponding first calculation range in the first touch related sensing information based on each position;

determining a corresponding base value based on each first calculation range;

generating a set of calculation values by subtracting the corresponding base value from all the values in each first calculation range; and

calculating a centroid position based on each set of calculation values.

2. The method of claim 1, wherein values of the first touch related sensing information correspond to signals of a plurality of sensors or signals of a single sensor at a plurality of time points.

3. The method of claim 1, wherein the base value is the value immediately preceding the first calculation range, the average of the value immediately preceding and the value immediately following the first calculation range, the first value of the first calculation range, or the average of the first value and the last value of the first calculation range.

4. The method of claim 1, wherein values of the first touch related sensing information correspond to dual-differential signals of a plurality of sensors or dual-differential signals of a single sensor at a plurality of time points.

5. The method of claim 1, wherein the first touch related sensing information is converted from a second touch related sensing information, and each first value of the first touch related sensing information corresponding to a second value of the second touch related sensing information, wherein the first value is an accumulation of the second value with all the values preceding or following the second value.

6. The method of claim 5, wherein the at least one position is determined based on at least one zero-crossing in the second touch related sensing information, wherein each zero-crossing is between a pair of positive and negative values of the second touch related sensing information.

7. The method of claim 1, wherein the first touch related sensing information is converted from a second touch related sensing information, and each value of the second touch related sensing information being a dual difference, each dual difference being generated based on signals of three sensors from a plurality of sensors or signals of one sensor at three of a plurality of time points.

8. The method of claim 7, wherein the three sensors are adjacent.

9. The method of claim 7, wherein the three sensors are non-adjacent.

10. The method of claim 1, wherein the each position is determined based two zero-crossings in the second touch related sensing information, wherein each zero-crossing is between a pair of positive and negative values of the second touch related sensing information.

11. A device for determining centroid positions, comprising a controller and a host, which performs at least the following operations:

obtaining a first touch related sensing information;

obtaining at least one position;

determining a corresponding first calculation range in the first touch related sensing information based on each position;

determining a corresponding base value based on each first calculation range;

generating a set of calculation values by subtracting the corresponding base value from all the values in each first calculation range; and

calculating a centroid position based on each set of calculation values.

12. The device of claim 11, wherein values of the first touch related sensing information correspond to signals of a plurality of sensors or signals of a single sensor at a plurality of time points.

13. The device of claim 11, wherein the base value is the value immediately preceding the first calculation range, the average of the value immediately preceding and the value immediately following the first calculation range, the first value of the first calculation range, or the average of the first value and the last value of the first calculation range.

14. The device of claim 11, wherein values of the first touch related sensing information correspond to dual-differential signals of a plurality of sensors or dual-differential signals of a single sensor at a plurality of time points.

15. The device of claim 11, wherein the first touch related sensing information is converted from a second touch related sensing information, and each first value of the first touch related sensing information corresponding to a second value of the second touch related sensing information, wherein the first value is an accumulation of the second value with all the values preceding or following the second value.

16. The device of claim 15, wherein the at least one position is determined based on at least one zero-crossing in the second touch related sensing information, wherein each zero-crossing is between a pair of positive and negative values of the second touch related sensing information.

17. The device of claim 11, wherein the first touch related sensing information is converted from a second touch related sensing information, and each value of the second touch related sensing information being a dual difference, each dual difference being generated based on signals of three sensors from a plurality of sensors or signals of one sensor at three of a plurality of time points.

18. The device of claim 17, wherein the three sensors are adjacent.

19. The device of claim 17, wherein the three sensors are non-adjacent.

20. The device of claim 11, wherein the each position is determined based two zero-crossings in the second touch related sensing information, wherein each zero-crossing is between a pair of positive and negative values of the second touch related sensing information.