Compensating for source line interference

Patent metadata

Field	Value
Publication number	US-9367189-B2
Application number	US-201414319635-A
Country	US
Kind code	B2
Filing date	Jun 30, 2014
Priority date	Apr 29, 2014
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

Embodiments of the present invention generally provide an input device including a display device having an integrated capacitive sensing device. The input device includes a plurality of source lines, a plurality of routing traces coupled to a plurality of sensor electrodes, and a processing system. The processing system is configured to update a first sub-pixel coupled to a first source line by driving the first source line with a first voltage. The processing system is further configured to drive one or more routing traces included in the plurality of routing traces with a second voltage that is an inverted version of the first voltage. The processing system is further configured to receive resulting signals from at least one sensor electrode via the one or more routing traces while the one or more routing traces are driven with the second voltage, and determine positional information based on the resulting signals.

First claim

The invention claimed is:

1. An input device comprising a display device having an integrated capacitive sensing device, the input device comprising:
a plurality of source lines;
a plurality of routing traces coupled to a plurality of sensor electrodes; and
a processing system coupled to the plurality of source lines and the plurality of routing traces, the processing system configured to:
update a first sub-pixel coupled to a first source line included in the plurality of source lines by driving the first source line with a first voltage;
drive one or more routing traces included in the plurality of routing traces with a second voltage, wherein the second voltage is an inverted version of the first voltage;
receive resulting signals from at least one sensor electrode included in the plurality of sensor electrodes via the one or more routing traces while the one or more routing traces are driven with the second voltage; and
determine positional information based on the resulting signals.

2. The input device of claim 1 , wherein the plurality of routing traces are disposed on the same layer as the plurality of source lines.

3. The input device of claim 1 , wherein the plurality of routing traces and the plurality of source lines are disposed on different layers of the input device, and the plurality of routing traces are substantially parallel to the plurality of source lines.

4. The input device of claim 1 , wherein the processing system is configured to drive the second voltage with a phase delay relative to the first voltage.

5. The input device of claim 1 , wherein the first source line is coupled to each of the one or more routing traces via one or more coupling traces, and the processing system is configured to drive the one or more routing traces with the second voltage via the one or more coupling traces.

6. The input device of claim 5 , further comprising an inverter circuit coupled to the one or more coupling traces, wherein the inverter circuit is configured to generate the second voltage by inverting and modifying an amplitude of the first voltage.

7. The input device of claim 6 , further comprising a filter coupled to the one or more coupling traces, wherein the filter is configured to generate the second voltage by adding a phase delay to the first voltage.

8. The input device of claim 1 , wherein the processing system is further configured to drive a first sensor electrode included in the plurality of sensor electrodes with a transmitter signal, and the resulting signals comprise effects associated with the transmitter signal.

9. The input device of claim 1 , wherein the processing system is further configured to drive the at least one sensor electrode included in the plurality of sensor electrodes with a modulated signal, and the resulting signals comprise effects associated with the modulated signal.

10. The input device of claim 1 , wherein the second voltage is configured to cancel noise received from the first source line by the one or more sensor electrodes.

11. The input device of claim 1 , wherein the processing system is further configured to:
update a second sub-pixel coupled to a second source line included in the plurality of source lines by driving the second source line with a third voltage;
drive at least one routing trace included in the one or more routing traces with a fourth voltage, wherein the fourth voltage is an inverted version of the third voltage; and
receive the resulting signals from the one or more sensor electrodes while the at least one routing trace is driven with the fourth voltage.

12. The input device of claim 1 , wherein driving the one or more routing traces with the second voltage causes a modulated signal to be driven onto one or more sensor electrodes included in the plurality of sensor electrodes.

13. A method of input sensing with a display device having an integrated capacitive sensing device and including a plurality of source lines and a plurality of sensor electrodes, the method comprising:
updating a first sub-pixel coupled to a first source line included in the plurality of source lines by driving the first source line with a first voltage;
driving one or more sensor electrodes included in the plurality of sensor electrodes with a second voltage that is an inverted version of the first voltage;
receiving resulting signals from the one or more sensor electrodes while the one or more sensor electrodes are driven with the second voltage; and
determining positional information based on the resulting signals.

14. The method of claim 13 , wherein driving the one or more sensor electrodes with the second voltage is performed by driving the second voltage with a phase delay relative to the first voltage.

15. The method of claim 13 , further comprising coupling the first source line to each of the one or more sensor electrodes via one or more coupling traces, and wherein driving the one or more sensor electrodes with the second voltage is performed via the one or more coupling traces.

16. The method of claim 15 , further comprising coupling an inverter circuit to the one or more coupling traces, and generating the second voltage by inverting and modifying an amplitude of the first voltage.

17. The method of claim 16 , further comprising coupling a filter to the one or more coupling traces, and wherein generating the second voltage further comprises adding a phase delay to the first voltage with the filter.

18. The method of claim 13 , further comprising driving a first sensor electrode included in the plurality sensor electrodes with a transmitter signal, and wherein the resulting signals comprise effects associated with the transmitter signal.

19. The method of claim 13 , further comprising driving the one or more sensor electrodes with a modulated signal, and wherein the resulting signals comprise effects associated with the modulated signal.

20. The method of claim 13 , further comprising:
updating a second sub-pixel coupled to a second source line included in the plurality of source lines by driving the second source line with a third voltage;
generating a fourth voltage by inverting the third voltage;
driving at least one sensor electrode included in the one or more sensor electrodes with the fourth voltage; and
receiving the resulting signals from the one or more sensor electrodes while the at least one sensor electrode is driven with the fourth voltage.

21. A processing system for a display device having an integrated sensing device, the processing system comprising:
a driver module comprising driver circuitry, the driver module coupled to a plurality of source lines and configured for updating a first sub-pixel coupled to a first source line included in the plurality of source lines by driving the first source line with a first voltage;
a sensor module coupled to a plurality of routing traces, each routing trace being coupled to a sensor electrode included in a plurality of sensor electrodes, the sensor module configured for receiving resulting signals with at least one sensor electrode included in the plurality of sensor electrodes via one or more routing traces included in the plurality of routing traces while the one or more routing traces are driven with the second voltage, wherein the second voltage is an inverted version of the first voltage; and
a determination module configured for determining positional information based on the resulting signals.

22. The processing system of claim 21 , wh

Assignees

• Synaptics Inc

Inventors

• Morein Stephen L
• Shepelev Petr
• Reynolds Joseph Kurth
• Lukanc Jeffrey

Classifications

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/04166

  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 title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title