ELECTRONIC DEVICE INCLUDING TOUCH-SENSITIVE DISPLAY AND METHOD OF DETECTING TOUCHES

• US 20150123930A1
• Filed: 11/04/2013
• Published: 05/07/2015
• Est. Priority Date: 11/04/2013
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: SINGH, Amit Pal, HO, Christopher Ying Wai
• Granted Patent: US 9,436,324 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/041662 using alternate mutual and self-capacitive scanning
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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

Abstract

A touch-sensitive display includes first electrodes and second electrodes coupled to a first controller to detect touches by self-capacitance touch sensing. The touch-sensitive display also includes third electrodes coupled to a second controller to detect touches by mutual-capacitance touch sensing utilizing the third electrodes and the second electrodes. The first electrodes are different from the third electrodes.

Claims

1. A touch-sensitive display comprising:

first electrodes and second electrodes coupled to a first controller to detect touches by self-capacitance touch sensing;

third electrodes coupled to a second controller to detect touches by mutual-capacitance touch sensing utilizing the third electrodes and the second electrodes;

wherein the first electrodes are different from the third electrodes.

2. The touch-sensitive display according to claim 1, wherein the third electrodes are not utilized for self-capacitance touch sensing.

3. The touch-sensitive display according to claim 1, wherein touch data received from the first electrodes is not utilized during mutual-capacitance touch sensing.

4. The touch-sensitive display according to claim 1, wherein the first electrodes are shaped to detect location of a touch along a length of the electrode.

5. The touch-sensitive display according to claim 1, wherein the first electrodes are wider at a first end than at a second end.

6. The touch-sensitive display according to claim 1, wherein the first electrodes are disposed between the second electrodes such that one of the first electrodes is disposed between two consecutive electrodes of the second electrodes and is not disposed between fingers of any one of the second electrodes.

7. The touch-sensitive display according to claim 1, wherein the third electrodes comprise common electrodes utilized to display information on the touch-sensitive display.

8. The touch-sensitive display according to claim 1, wherein the second controller comprises a display controller.

9. The touch-sensitive display according to claim 1, wherein the first controller comprises a touch controller coupled to the second electrodes and the third electrodes to sense a touch when the second electrodes are utilized to detect touches by mutual-capacitance touch sensing and to control the first and second electrodes during self-capacitance touch sensing.

10. The touch-sensitive display according to claim 1, wherein the first controller is coupled to the second controller to coordinate control of the third electrodes and the second electrodes to detect touches by mutual-capacitance touch sensing.

11. The touch-sensitive display according to claim 1, wherein the touch data from a first electrode of the first electrodes varies with location of touch along the first electrode.

12. The touch-sensitive display according to claim 1, wherein a first coordinate value is determined based on touch data received from the first electrodes and the second coordinate value is determined based on touch data received from the second electrodes.

13. The touch-sensitive display according to claim 1, wherein the first electrodes are disposed between the second electrodes such that consecutive second electrodes are separated by first electrodes.

14. A portable electronic device comprising the touch-sensitive display according to claim 1.

15. A method comprising:

detecting touches by self-capacitance touch sensing utilizing first electrodes and second electrodes coupled to a touch controller of a touch-sensitive display;

detecting touches by mutual-capacitance touch sensing utilizing the second electrodes and utilizing third electrodes coupled to a display controller of the touch-sensitive display;

wherein the first electrodes are different from the third electrodes.

16. The method according to claim 15, wherein the third electrodes are not for self-capacitance touch sensing.

17. The method according to claim 15, wherein touch data received from the first electrodes is not utilized during mutual-capacitance touch sensing.

18. The method according to claim 15, wherein touches are detected by self-capacitance touch sensing when the electronic device is operating in a low-power condition.

19. A computer-readable storage medium having computer-readable code stored thereon, the computer-readable code executable by at least one processor of the portable electronic device to perform the method of claim 15.

20. An electronic device comprising:

first electrodes coupled to a first controller to identify a first coordinate value of a touch during self-capacitance touch sensing;

second electrodes coupled to the first controller to identify a second coordinate value of a touch during self-capacitance touch sensing,

third electrodes coupled to a second controller to detect touches by mutual-capacitance touch sensing utilizing the third electrodes and the second electrodes;

wherein the first electrodes are disposed between the second electrodes such that one of the first electrodes is disposed between two consecutive electrodes of the second electrodes and is not disposed between fingers of any one of the second electrodes, and wherein the first electrodes are different from the third electrodes.