Mitigation of display update noise using proximately disposed coupling electrode

• US 9,298,314 B2
• Filed: 06/19/2014
• Issued: 03/29/2016
• Est. Priority Date: 02/04/2014
• Status: Active Grant

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: Knausz, Imre, Bohannon, Eric Scott, Ludden, Christopher A.
• Primary Examiner(s): Amadiz, Rodney
• Application Number:
  US14/308,986
• Publication Number:
  US 20150220206A1
• Time in Patent Office: 649 Days
• Field of Search: 345/156, 345/173, 345/174, 178 1801- 1809
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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

Embodiments include a method (as well as an input device and processing system) that includes driving a display signal onto at least one of a plurality of display electrodes for updating a display, and driving an input sensing signal onto at least one of a plurality of sensor electrodes, where driving the input sensing and driving the display signal at least partially overlap in time. The method further includes receiving, using a coupling electrode disposed proximate to the at least one display electrode, a coupling signal that represents an effect of a signal on at least one of the display electrodes, on a signal on at least one of the sensor electrodes, acquiring resulting signals with at least one of the sensor electrodes, and adjusting the resulting signals based on the coupling signal.

Claims

1. An input device, comprising:

a plurality of display electrodes comprising a plurality of source driver electrodes;

a plurality of sensor electrodes;

a coupling electrode disposed proximate to at least a first display electrode of the plurality of display electrodes; and

a processing system coupled to the plurality of display electrodes, the plurality of sensor electrodes, and the coupling electrode, wherein the processing system comprises receiver circuitry having an input coupled with at least one sensor electrode of the plurality of sensor electrodes, wherein the processing system is configured to;

drive at least the first display electrode of the plurality of display electrodes with a display update signal to update a display, wherein the first display electrode comprises at least one of the plurality of source driver electrodes;

receive a coupling signal with the coupling electrode, the coupling signal comprising effects corresponding to the display update signal;

acquire, at the input of the receiver circuitry, resulting signals with the at least one sensor electrode; and

adjust the resulting signals based on the coupling signal.

2. The input device of claim 1, further comprising a current copying circuit, wherein the coupling electrode is capacitively coupled to one or more of the plurality of source driver electrodes, and wherein an input of the current copying circuit is electrically coupled to the coupling electrode and an output of the current copying circuit is coupled to the receiver.

3. The input device of claim 2, wherein the coupling electrode is disposed on one of the same plane and a parallel plane as a plurality of gate electrodes included in the plurality of display electrodes.

4. The input device of claim 1, wherein the coupling electrode is one of a plurality of coupling electrodes of the input device, wherein each of the plurality of coupling electrodes is directly electrically coupled to a respective one of the plurality of source driver electrodes, wherein adjusting the resulting signals comprises subtracting, from the input of the receiver, a sum of scaled coupling signals received with the plurality of coupling electrodes.

5. The input device of claim 1, wherein the plurality of display electrodes comprises a plurality of common electrodes, and wherein each of the plurality of sensor electrodes comprises at least one of the plurality of common electrodes.

6. The input device of claim 5, wherein the plurality of sensor electrodes comprises a plurality of common electrodes arranged in a matrix configuration.

7. The input device of claim 1, wherein driving the first display electrode with the display update signal to update the display and acquiring resulting signals with the at least one sensor electrode at least partially overlap in time.

8. The input device of claim 1, wherein the plurality of sensor electrodes comprises a plurality of transmitter electrodes and a plurality of receiver electrodes, wherein at least one of the transmitter electrodes comprises a common electrode.

9. A processing system, comprising:

a display driver module comprising source driver circuitry configured to drive a plurality of source driver electrodes with display update signals to update a display of a display device; and

a sensor module comprising receiver circuitry coupled to a plurality of sensor electrodes, wherein the sensor module is configured to receive a plurality of resulting signals with the plurality of sensor electrodes;

wherein the processing system is configured to adjust the plurality of resulting signals based on a coupling signal received with a coupling electrode, wherein the coupling signal comprises effects corresponding to at least one of the display update signals.

10. The processing system of claim 9, wherein adjusting the plurality of resulting signals is performed at an input of the receiver circuitry.

11. The processing system of claim 9, wherein the coupling electrode is capacitively coupled to one or more of the plurality of source driver electrodes.

12. The processing system of claim 11, wherein adjusting the resulting signals is performed by a coarse background compensation module.

13. The processing system of claim 9, wherein at least a portion of the source driver circuitry and at least a portion of the receiver circuitry are disposed on a single integrated circuit.

14. The processing system of claim 13, wherein the coupling electrode is included within the integrated circuit.

15. The processing system of claim 9, wherein driving the plurality of source driver electrodes and receiving the plurality of resulting signals at least partially overlap in time.

16. The processing system of claim 9, wherein the sensor module is further configured to drive the plurality of sensor electrodes with modulated signals, wherein the plurality of resulting signals comprise effects corresponding to the modulated signals.

17. The processing system of claim 9, wherein each of the plurality of sensor electrodes comprises at least one common electrode of a plurality of common electrodes of the display device, wherein the common electrodes are configured to be driven for display updating and input sensing.

18. A method, comprising:

driving a display update signal onto at least a first display electrode of a plurality of display electrodes for updating a display, the plurality of display electrodes comprising a plurality of source driver electrodes, the first display electrode comprising at least one of the plurality of source driver electrodes;

receiving a coupling signal with a coupling electrode disposed proximate to the first display electrode, the coupling signal comprising effects corresponding to the display update signal;

acquiring, using receiver circuitry having an input coupled with at least a first sensor electrode of the plurality of sensor electrodes, resulting signals with the first sensor electrode; and

adjusting the resulting signals based on the coupling signal.

19. The method of claim 18, wherein the coupling electrode is capacitively coupled to one or more of the plurality of source driver electrodes, and wherein adjusting the resulting signals is performed by a coarse background compensation module.

20. The method of claim 18, wherein driving the display update signal and acquiring resulting signals at least partially overlap in time.

21. The method of claim 18, wherein acquiring resulting signals includes driving an input sensing signal configured for transcapacitive sensing onto at least one of the plurality of sensor electrodes.

22. The method of claim 18, wherein acquiring resulting signals includes driving an input sensing signal configured for absolute capacitive sensing onto at least one of the plurality of sensor electrodes.