CONCURRENT INPUT SENSING AND DISPLAY UPDATING

• US 20140078097A1
• Filed: 12/20/2012
• Published: 03/20/2014
• Est. Priority Date: 09/20/2012
• Status: Active Grant

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: Shepelev, Petr, Sabo, David
• Granted Patent: US 10,073,550 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 of the present invention generally provide a processing system for a display device integrated with a capacitive sensing device. The processing system includes a driver module having driver circuitry and coupled to a sub-pixel with a first source line and a first common electrode. The driver module is configured to simultaneously update the sub-pixel by driving the first source line with a first voltage, and drive the first common electrode for capacitive sensing by modulating the first common electrode between a second voltage and a third voltage. The processing system further includes a receiver module coupled to a plurality of receiver electrodes. The receiver module is configured to receive resulting signals from the receiver electrodes while the first common electrode is modulated between the second voltage and the third voltage. The processing system further includes a determination module configured to determine positional information based on the resulting signals.

Claims

1. A processing system for a display device integrated with a capacitive sensing device, the processing system comprising:

a driver module comprising driver circuitry, the driver module coupled to a sub-pixel with a first source line and a first common electrode, wherein the driver module is configured to simultaneously;

update the sub-pixel by driving the first source line with a first voltage; and

drive the first common electrode for capacitive sensing by modulating the first common electrode between a second voltage and a third voltage;

a receiver module coupled to a plurality of receiver electrodes configured to receive resulting signals from the receiver electrodes while the first common electrode is modulated between the second voltage and the third voltage; and

a determination module configured to determine positional information based on the resulting signals.

2. The processing system of claim 1, wherein updating the sub-pixel comprises driving a capacitive element associated with the sub-pixel to a predetermined level to achieve a first brightness level of the sub-pixel.

3. The processing system of claim 1, wherein updating the sub-pixel comprises driving a light-emitting diode associated with the sub-pixel to a predetermined level to achieve a first brightness level of the sub-pixel.

4. The processing system of claim 1, wherein the driver module is configured to simultaneously update the sub-pixel, drive the first common electrode for capacitive sensing, and drive a second common electrode for capacitive sensing by modulating the second common electrode between the second voltage and the third voltage.

5. The processing system of claim 1, wherein the driver module is configured to simultaneously update the sub-pixel and drive the first common electrode for capacitive sensing by modulating the first common electrode between the second voltage and the third voltage and between the second voltage and a fourth voltage.

6. The processing system of claim 1, wherein the driver module is configured to:

update the sub-pixel at a first update frequency;

detect interference associated with the capacitive sensing; and

transition from the first update frequency to a second update frequency.

7. The processing system of claim 1, wherein modulating the first common electrode between the second voltage and the third voltage comprises driving the first common electrode with a substantially square waveform.

8. A display device integrated with a capacitive sensing device comprising:

a sub-pixel;

a first source line coupled to the sub-pixel;

a first common electrode coupled to the sub-pixel;

a plurality of receiver electrodes; and

a processing system coupled to the first source line, first common electrode, and plurality of receiver electrodes, the processing system configured to;

simultaneously update the sub-pixel and drive the first common electrode for capacitive sensing by;

driving the first source line with a first voltage; and

modulating the first common electrode between a second voltage and a third voltage;

receive resulting signals from the receiver electrodes while the first common electrode is modulated between the second voltage and the third voltage; and

determine positional information based on the resulting signals.

9. The display device of claim 8, wherein updating the sub-pixel comprises driving a capacitive element associated with the sub-pixel to a predetermined level to achieve a first brightness level of the sub-pixel.

10. The display device of claim 8, wherein updating the sub-pixel comprises driving a light-emitting diode associated with the sub-pixel to a predetermined level to achieve a first brightness level of the sub-pixel.

11. The display device of claim 8, wherein the processing system is configured to simultaneously update the sub-pixel, drive the first common electrode for capacitive sensing, and drive a second common electrode for capacitive sensing by modulating the second common electrode between the second voltage and the third voltage.

12. The display device of claim 8, wherein the processing system is configured to simultaneously update the sub-pixel and drive the first common electrode for capacitive sensing by modulating the first common electrode between the second voltage and the third voltage and between the second voltage and a fourth voltage.

13. The display device of claim 8, wherein the processing system is configured to:

update the sub-pixel at a first update frequency;

detect interference associated with the capacitive sensing; and

transition from the first update frequency to a second update frequency.

14. The display device of claim 8, wherein modulating the first common electrode between the second voltage and the third voltage comprises driving the first common electrode with a substantially square waveform.

15. A method of capacitive sensing with a display device integrated with a capacitive sensing device having a sub-pixel, a first source line coupled to the sub-pixel, a first common electrode coupled to the sub-pixel, and a plurality of receiver electrodes, the method comprising:

simultaneously updating the sub-pixel and driving the first common electrode for capacitive sensing by;

driving the first source line with a first voltage; and

modulating the first common electrode between a second voltage and a third voltage;

receiving resulting signals from the receiver electrodes while the first common electrode is modulated between the second voltage and the third voltage; and

determining positional information based on the resulting signals.

16. The method of claim 15, wherein updating the sub-pixel comprises driving a capacitive element associated with the sub-pixel to a predetermined level to achieve a first brightness level of the sub-pixel.

17. The method of claim 15, wherein updating the sub-pixel comprises driving a light-emitting diode associated with the sub-pixel to a predetermined level to achieve a first brightness level of the sub-pixel.

18. The method of claim 15, further comprising simultaneously updating the sub-pixel, driving the first common electrode for capacitive sensing, and driving a second common electrode for capacitive sensing by modulating the second common electrode between the second voltage and the third voltage

19. The method of claim 15, further comprising simultaneously updating the sub-pixel and driving the first common electrode for capacitive sensing by modulating the first common electrode between the second voltage and the third voltage and between the second voltage and a fourth voltage.

20. The method of claim 15, further comprising:

updating the sub-pixel at a first update frequency;

detecting interference associated with the capacitive sensing; and

transitioning from the first update frequency to a second update frequency.