SELF-CAPACITIVE TOUCH CONTROL APPARATUS AND CONTROL METHOD THEREOF

• US 20140104232A1
• Filed: 10/16/2013
• Published: 04/17/2014
• Est. Priority Date: 10/16/2012
• Status: Active Grant

• Current Assignee: Ili Technology Corp. (MediaTek, Inc.)
• Original Assignee: MStar Semiconductor Incorporated (MediaTek, Inc.)
• Inventors: Liu, Chun-Chen, Tsai, Meng-Che
• Granted Patent: US 9,354,739 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A self-capacitive touch control apparatus includes a plurality of electrodes, a plurality of sensors, and a number determining module. The sensors detect capacitance changes in the electrodes to generate a plurality of sensing results. The number determining module calculates a total sensing amount according to the sensing results, and determines the number of touch points according to the total sensing amount.

Claims

1. A self-capacitive touch control apparatus, comprising:

a plurality of electrodes;

a plurality of sensors, configured to detect capacitance changes in the electrodes to generate a plurality of sensing results; and

a number determining module, configured to calculate a total sensing amount according to the sensing results, and to determine a number of touch points according to the total sensing amount.

2. The self-capacitive touch control apparatus according to claim 1, further comprising:

a grouping module, configured to group the sensing results according to the number of touch points to generate a grouping result; and

a positioning module, configured to generate position information of one or more touch points corresponding to the number of touch points according to the grouping result and the sensing results.

3. The self-capacitive touch control apparatus according to claim 2, wherein the grouping module eliminates a part of the sensing results according to a first threshold;

the first threshold is for removing at least one interference sensing result from the sensing results;

the positioning module generates the position information of the one or more touch points corresponding to the number of touch points according to the sensing results preserved.

4. The self-capacitive touch control apparatus according to claim 2, wherein the grouping module groups the sensing results into one or more groups of sensing results as the grouping result;

at least one of the sensing results in each of the groups is greater than a second threshold, which is for confirming that the sensing results correspond to at least one touch point.

5. The self-capacitive touch control apparatus according to claim 2, wherein the grouping module groups the sensing results into one or more groups of sensing results as the grouping result, searches for an ascending trend and a descending trend from the sensing results, and determines the sensing results between the ascending trend and the descending trend as one group of effective sensing results.

6. The self-capacitive touch control apparatus according to claim 2, wherein a target touch point indicated by the grouping result corresponds to an N number of target sensing results among the sensing results, where N is a positive integer;

the positioning module calculates position information of the target touch point according to equations below, the position information comprises a first coordinate x and a second coordinate y;

7. A control method for a self-capacitive touch control apparatus, the self-capacitive touch control apparatus comprising a plurality of electrodes, the control method comprising:

a) detecting capacitance changes in the electrodes to generate a plurality of sensing results; and

b) calculating a total sensing amount according to the sensing results, and determining a number of touch points according to the total sensing amount.

8. The control method according to claim 7, further comprising:

c) grouping the sensing results according to the number of touch points to generate a grouping result; and

d) generating position information of one or more touch points corresponding to the number of touch points according to the grouping result and the sensing results.

9. The control method according to claim 8, wherein step (c) comprises eliminating a part of the sensing results according to a first threshold, the first threshold is for removing at least one interference sensing result from the sensing results;

step (d) comprises generating the position information of the one or more touch points corresponding to the number of touch points according to the sensing results preserved.

10. The control method according to claim 8, wherein the grouping result is one or more groups of sensing results;

each group of sensing results comprises at least one sensing result that is greater than a second threshold, which is for confirming the sensing results correspond to at least one touch point.

11. The control method according to claim 8, wherein the grouping result is one or more groups of sensing results;

step (c) comprises searching for an ascending trend and a descending trend from the sensing results, and determining the sensing results between the ascending trend and the descending trend as one group of effective sensing results.

12. The control method according to claim 8, wherein a target touch point indicated by the grouping result corresponds to an N number of target sensing results among the sensing results, where N is a positive integer;

step (d) comprises calculating position information of the target touch point according to equations below, the position information comprises a first coordinate x and a second coordinate y;

13. A self-capacitive touch control apparatus, comprising:

a plurality of first electrodes, having a shape similar to a right triangle;

a plurality of second electrodes, having shape similar to a parallelogram;

a plurality of sensors, configured to sense capacitance changes in the first electrodes and the second electrodes to generate a plurality of sensing results; and

a positioning module, configured to determine position information corresponding to a target touch point, the position information comprising a first coordinate x and a second coordinate y and being represented as;

14. The self-capacitive touch control apparatus according to claim 13, further comprising:

a number determining module, configured to calculate a total sensing amount according to the sensing results, and to determine a number of touch points according to the total sensing amount; and

a grouping module, configured to group the sensing results according to the number of touch points to generate a plurality of effective sensing results and a grouping result;

wherein, the positioning module generates the position information of the target touch point according to the grouping result and an N number of target sensing results corresponding to the target touch point from effective sensing results.

15. The self-capacitive touch control apparatus according to claim 14, wherein the grouping module eliminates a part of the sensing results according to a first threshold to generate the effective sensing results.

16. The self-capacitive touch control apparatus according to claim 14, wherein the grouping module groups the effective sensing results into one or more groups of effective sensing results as the grouping result, and each group of effective sensing result comprises at least one sensing result greater than a second threshold.

17. The self-capacitive touch control apparatus according to claim 14, wherein the grouping module groups the effective sensing results into one or more groups of effective sensing results as the grouping result, searches for an ascending trend and a descending trend from the sensing results, and determines the sensing results between the ascending trend and the descending trend as the effective sensing results, and one group of effective sensing results.