METHOD FOR AUTHENTICATING CAPACITIVE TOUCH

• US 20150355750A1
• Filed: 10/08/2014
• Published: 12/10/2015
• Est. Priority Date: 10/08/2013
• Status: Active Grant

• Current Assignee: 12CM Global Pte. Ltd.
• Original Assignee: 12cm, Inc.
• Inventors: KIM, Jae-Hyung, HAN, Jeong-Gyoun
• Granted Patent: US 10,175,828 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 21/36 by graphic or iconic representation
• 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 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

There are provided a method for authenticating capacitive touch. The method for authenticating capacitive touch according to the invention is executed through a system interworking with a capacitive touch screen that supports multi-touch, the method comprising, a first step of receiving touch point information for the plurality of touch points recognized as multi-touch through the capacitive touch screen, a second step of reading the touch point information and identifying a specified touch point corresponding to any one specified touch portion fixed and arranged in a previously specified position in design among touch portions of a touch device in which a plurality of capacitively touchable touch portions are arranged according to a previously designed unique geometric relationship, a third step of coordinate-rotating the plurality of touch points or a geometric relationship for the plurality of touch points to match a designed geometric relationship based on a reference point corresponding to the specified touch point, and a fourth step of authenticating whether the coordinate-rotated geometric relationship matches the designed geometric relationship within a tolerance range or identifying the designed geometric relationship matching the coordinate-rotated geometric relationship within a tolerance range among the designed geometric relationships.

Claims

1. A method for authenticating capacitive touch that is executed through a system interworking with a capacitive touch screen that supports multi-touch, the method comprising:

a first step of storing designed geometric relationships for arranging a plurality of touch portions in a unique geometric relationship on a touch device that is to be touched in a capacitive touch screen;

a second step of receiving touch point information about a plurality of touch points recognized as multi-touch through the capacitive touch screen;

a third step of reading the touch point information and identifying a specified touch point corresponding to any one specified touch portion fixed and arranged in a specified position in design among the plurality of touch portions arranged in the designed geometric relationship on the touch device;

a fourth step of coordinate-rotating the plurality of touch points or a geometric relationship for the plurality of touch points to match the designed geometric relationship based on a reference point corresponding to the specified touch point; and

a fifth step of authenticating whether the coordinate-rotated geometric relationship matches the stored designed geometric relationship within a tolerance range or identifying a geometric relationship matching the coordinate-rotated geometric relationship within a tolerance range among the stored designed geometric relationships.

2. The method according to claim 1, wherein the touch point information includes a coordinate value in a coordinate system set in the capacitive touch screen in which the plurality of touch points are recognized as multi-touch.

3. The method according to claim 1, wherein the designed geometric relationship includes at least one of a distance relationship and an angular relationship between center points of the respective touch portions.

4. The method according to claim 1, wherein the designed geometric relationship includes at least one of a distance relationship and an angular relationship between the center point of the specified touch portion and the center point of the other touch portions.

5. The method according to claim 1, wherein the designed geometric relationship includes at least one of the distance relationship and the angular relationship between a coordinate origin identified using the specified touch point and the center point of each touch portion.

6. The method according to claim 1, wherein the reference point includes the specified touch point or a coordinate origin identified using the specified touch point.

7. The method according to claim 1, wherein the geometric relationship for the plurality of touch points includes at least one of a distance relationship and an angular relationship between the respective touch points.

8. The method according to claim 1, wherein the geometric relationship for the plurality of touch points includes at least one of a distance relationship and an angular relationship between the specified touch point and the other touch points.

9. The method according to claim 1, wherein the geometric relationship for the plurality of touch points includes at least one of a distance relationship and an angular relationship between a coordinate origin identified using the specified touch point and each touch point.

10. The method according to claim 7, wherein the distance relationship includes a coordinate distance in a coordinate system for reading the geometric relationship.

11. The method according to claim 7, wherein the angular relationship includes a coordinate angle in a coordinate system for reading the geometric relationship.

12. The method according to claim 1, further comprising:

coordinate-transforming the touch point information to a coordinate system corresponding to the designed geometric relationship.

13. The method according to claim 1, further comprising:

authenticating whether the number of touch points included in the touch point information matches the number of touch portions in design.

14. The method according to claim 1, further comprising:

a touch point authentication step of reading mutual position relationship between the respective touch points and authenticating whether the plurality of touch points are touch points of a valid touch device.

15. The method according to claim 14, further comprising:

authenticating whether a distance between the respective touch points is equal to or greater than a minimum distinction recognition distance set in design.

16. The method according to claim 14, wherein the touch point authentication step includes authenticating whether a maximum spacing distance among distances between the respective touch points is smaller than a maximum spacing distance set in design.

17. The method according to claim 14, wherein the touch point authentication step includes authenticating whether a polygonal geometric characteristic formed by segments connecting the respective touch points includes a polygonal geometric characteristic capable of being formed by connecting center points of the touch portions arranged in the touch device.

18. The method according to claim 1, wherein the second step includes reading the geometric structure of the touch points corresponding to the touch point information based on a designed geometric structure condition for arranging a plurality of touch portions in a flat plate area of a frame portion included in the touch device, and identifying a specified touch point fixed and arranged in a specified position within the flat plate area.

19. The method according to claim 1,

wherein the designed geometric relationship includes a relationship in which the touch portions are positioned at calculated positions in n-division areas (n≧

4) partitioned in design, respectively, and one touch portion is fixed in a designated position in one designated area out of the n-division areas, and

the second step includes confirming a specified area including two touch points among the n-division areas by reading the touch point information based on the division area information in design, and identifying a specified touch point corresponding to a specified position within the confirmed specified area.

20. The method according to claim 1, further comprising:

coordinate-transforming the specified touch point and other touch points into a coordinate system corresponding to the designed geometric relationship upon identifying the specified touch point.

21. The method according to claim 1, further comprising:

calculating a geometric relationship of the coordinate-rotated touch points.

22. The method according to claim 1, further comprising:

coordinate-transforming the calculated geometric relationship into a coordinate system corresponding to the designed geometric relationship upon calculating the geometric relationship.

23. The method according to claim 1,

wherein the system is implemented through a user device including the capacitive touch screen, implemented on a server communicating with the user device including the capacitive touch screen, or implemented on the user device including the capacitive touch screen and the server in a distributed manner.