METHOD FOR DETECTING AN ANGULAR VARIATION OF A CONTROL PATH ON A TOUCH SURFACE AND CORRESPONDING CONTROL MODULE

• US 20110025618A1
• Filed: 12/19/2008
• Published: 02/03/2011
• Est. Priority Date: 12/20/2007
• Status: Active Grant

• Current Assignee: DAV Société par actions simplifiée
• Original Assignee: DAV Société par actions simplifiée
• Inventors: Chartrain, Cedric, De Vaux Bidon, Florent, Cottarel, Bruno
• Granted Patent: US 9,880,732 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0414 using force sensing means to determine a position
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text

Abstract

The invention relates to a method for determining the elementary angle of a control path on a touch surface, characterised in that it comprises measuring two elementary movement values (|dX|, |dY|) along two perpendicular axes (X, Y) for a predetermined duration (dT), comparing said values (|dX|, |dY|) with unitary value ranges of elementary movements (Xu, Yu) of a reference data table and allocating a reference data representative of an angle to an elementary angle (dθ) of the control path. The invention also relates to a method for detecting an angular variation of a control path on a touch surface, characterised in that it comprises implementing the above method for determining the elementary angle of a control path on a touch surface and storing the elementary angle (dθ) allocated during an elementary step, repeating the elementary step, and assembling in series the allocated elementary angles (dθ) in order to determine an angular variation of the control path. The invention further relates to a control module including a touch surface (1), characterised in that it comprises a processing unit for implementing the method for detecting an angular variation of a control path as described above.

Claims

1. A method for determining an elementary angle of a control trajectory on a touch surface, comprising:

measuring two values of elementary displacements along two perpendicular axes in the course of a predetermined duration;

comparing said two values of elementary displacements with spans of unit values of elementary displacements of a reference data table; and

ascribing a reference datum representative of an angle to an elementary angle of the control trajectory.

2. The method as claimed in claim 1, wherein the reference datum representative of an angle is one of an integer number or a character.

3. The method as claimed in claim 1, wherein an intermediate elementary angle is initially determined, and based on the intermediate elementary angle, the elementary angle of the control trajectory relating to an axis in accordance with the sense of orientation of each elementary displacement is determined.

4. The method as claimed in claim 1, wherein said reference datum is representative of a zero angle when a sum of the two values of elementary displacements is less than a predetermined threshold.

5. The method as claimed in claim 1, wherein an elementary displacement value along an axis is divided by an integer number if the value of said displacement is greater than the unit value of maximum elementary displacement along the axis in the reference data table.

6. A method for detecting an angular variation of a control trajectory on a touch surface, comprising:

measuring two values of elementary displacements along two perpendicular axes in the course of a predetermined duration;

comparing said two values of elementary displacements with spans of unit values of elementary displacements of a reference data table; and

ascribing a reference datum representative of an angle to an elementary angle of the control trajectory;

storing the elementary angle ascribed in the course of an elementary step; and

repeating the elementary step and successively assembling the ascribed elementary angles to determine an angular variation of the control trajectory.

7. The detection method as claimed in claim 6, wherein the control trajectory is compared with a reference control trajectory library so as to retain a control trajectory exhibiting a significant shape corresponding to a predefined shape criterion.

8. The detection method as claimed in claim 6, wherein the shape of the control trajectory is determined on the basis of a difference of at least two successive elementary angles.

9. The detection method as claimed in claim 6, wherein a direction of rotation of the control trajectory is determined on the basis of a difference of at least two successive elementary angles (dθ

).

10. The detection method as claimed in claim 9, wherein the direction of rotation and the elementary angle are compared with an additional reference data table so as to ascribe to the control trajectory a position on a touch surface exhibiting the shape of a ring.

11. The detection method as claimed in claim 10, wherein a revolution counter is incremented when the control trajectory is greater than 360°

.

12. A control module comprising a touch surface, comprising a processing unit for implementation of a method for detecting an angular variation of a control trajectory, the method comprising:

measuring two values of elementary displacements along two perpendicular axes in the course of a predetermined duration;

comparing said two values of elementary displacements with spans of unit values of elementary displacements of a reference data table; and

ascribing a reference datum representative of an angle to an elementary angle of the control trajectory;

storing the elementary angle ascribed in the course of an elementary step; and

repeating the elementary step and successively assembling the ascribed elementary angles to determine an angular variation of the control trajectory.

13. The control module as claimed in claim 12, further comprising a display screen connected to the processing unit, able to display a control trajectory.

14. The control module as claimed in claim 13, wherein the control module is configured to control the functions of at least one set of electrical or electronic members of a motor vehicle.

15. The control module as claimed in claim 14, wherein the at least one set of electrical or electronic members of a motor vehicle comprise at least one selected from a group consisting of an air-conditioning system, an audio system, a navigation system, a telephone system, motorized window winder controls, controls for adjusting exterior rear-view mirrors, controls for adjusting the position of a sunroof, controls for interior lighting, controls for adjusting a motor vehicle seat.