Resonator circuit for a modulated power supply

• US 9,582,128 B2
• Filed: 12/23/2014
• Issued: 02/28/2017
• Est. Priority Date: 12/23/2014
• Status: Active Grant

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: Morein, Stephen L., Shepelev, Petr, Reynolds, Joseph Kurth
• Primary Examiner(s): NGUYEN, JENNIFER T
• Application Number:
  US14/581,794
• Publication Number:
  US 20160180814A1
• Time in Patent Office: 798 Days
• Field of Search: 345/174, 345211-213
• US Class Current: 1/1
• 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 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/024 with inductors, other than in the electrode driving circuitry of plasma displays
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

Examples of the present disclosure generally provide a processing system for a display device including an integrated capacitive sensing device. The processing system includes a sensor module configured to be coupled to a plurality of sensor electrodes. Each sensor electrode includes at least one display electrode. The sensor module drives the plurality of sensor electrodes for capacitive sensing during a first period. The processing system further includes a display driver configured to drive display signals onto the display electrodes during a second period. The display signals are based on a reference voltage, and the first period and the second period are at least partially overlapping. The processing system further includes a power supply configured to provide the reference voltage to the display driver. The power supply includes a resonator circuit having an inductor connected in parallel with a capacitor and configured to modulate the reference voltage.

Claims

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

a sensor module configured to be coupled to a plurality of sensor electrodes, each sensor electrode included in the plurality of sensor electrodes comprising at least one display electrode included in a plurality of display electrodes of the display device, wherein the sensor module drives the plurality of sensor electrodes for capacitive sensing during a first period;

a display driver configured to drive display signals onto the display electrodes during a second period, wherein the display signals are based on a reference voltage, and the first period and the second period are at least partially overlapping; and

a power supply configured to provide the reference voltage to the display driver, the power supply comprising a resonator circuit having an inductor connected in parallel with a capacitor, wherein the resonator circuit is configured to modulate the reference voltage.

2. The processing system of claim 1, wherein the resonator circuit is configured to:

modulate the reference voltage during the second period; and

maintain the reference voltage at a substantially constant voltage during a third period.

3. The processing system of claim 2, wherein the display driver is further configured to provide second display signals to the display electrodes during the third period to update a display of the display device, and the second display signals are based on the reference voltage.

4. The processing system of claim 1, wherein driving display signals onto the display electrodes during the second time period updates a display of the display device.

5. The processing system of claim 1, wherein a capacitance of the capacitor is configured to be adjusted to control a frequency of the resonator circuit.

6. The processing system of claim 5, wherein the capacitor comprises a switchable capacitor, and the frequency of the resonator circuit is based on a switch state of the switchable capacitor.

7. The processing system of claim 1, wherein an inductance of the inductor is configured to be adjusted to control a frequency of the resonator circuit.

8. The processing system of claim 7, wherein the inductor comprises a switchable inductor, and the frequency of the resonator circuit is based on a switch state of the switchable inductor.

9. The processing system of claim 7, wherein the inductor comprises a variable inductor having a plurality of tap positions, and the frequency of the resonator circuit is based on a selected tap position of the variable inductor.

10. The processing system of claim 1, wherein the display signals comprise a gate high voltage signal, a gate low voltage signal, a common voltage signal, and a source driver signal.

11. The processing system of claim 1, wherein the resonator circuit modulates the reference voltage based on a signal from the sensor module.

12. The processing system of claim 1, wherein the sensor module is configured to drive at least one sensor electrode included in the plurality of sensor electrodes with a capacitive sensing signal having a frequency that is substantially the same as a frequency of the reference voltage.

13. A display device comprising an integrated capacitive sensing device, the display device comprising:

a plurality of sensor electrodes, each sensor electrode included in the plurality of sensor electrodes comprising at least one display electrode included in a plurality of display electrodes of the display device;

a processing system coupled to the plurality of sensor electrodes and configured to;

drive the plurality of sensor electrodes for capacitive sensing during a first period; and

drive display signals onto the display electrodes during a second period, wherein the display signals are based on a reference voltage, and the first period and the second period are at least partially overlapping; and

a power supply configured to provide the reference voltage to the processing system, the power supply comprising a resonator circuit having an inductor connected in parallel with a capacitor, wherein the resonator circuit is configured to modulate the reference voltage.

14. The display device of claim 13, wherein:

the resonator circuit is configured to;

modulate the reference voltage during the second period; and

maintain the reference voltage at a substantially constant voltage during a third period; and

the processing system is further configured to provide second display signals to the display electrodes during the third period to update a display of the display device, wherein the second display signals are based on the reference voltage.

15. The display device of claim 13, wherein driving display signals onto the display electrodes during the second time period updates a display of the display device.

16. The display device of claim 13, wherein the processing system is configured to adjust a capacitance of the capacitor to control a frequency of the resonator circuit.

17. The display device of claim 16, wherein the capacitor comprises a switchable capacitor, and the frequency of the resonator circuit is based on a switch state of the switchable capacitor.

18. The display device of claim 13, wherein the processing system is configured to adjust an inductance of the inductor to control a frequency of the resonator circuit.

19. The display device of claim 18, wherein the inductor comprises a switchable inductor, and the frequency of the resonator circuit is based on a switch state of the switchable inductor.

20. The display device of claim 18, wherein the inductor comprises a variable inductor having a plurality of tap positions, and the frequency of the resonator circuit is based on a selected tap position of the variable inductor.

21. The display device of claim 13, wherein the display update signals comprise a gate high voltage signal, a gate low voltage signal, a common voltage signal, and a source driver signal.

22. A method of performing display updating with a display device comprising an integrated capacitive sensing device, the method comprising:

driving a capacitive sensing signal onto a plurality of sensor electrodes during a first period, each sensor electrode included in the plurality of sensor electrodes comprising at least one display electrode included in a plurality of display electrodes of the display device;

modulating a reference voltage via a resonator circuit, the resonator circuit having an inductor connected in parallel with a capacitor;

adjusting at least one of a capacitance of the capacitor and an inductance of the inductor to control a frequency of the resonator circuit; and

driving display update signals onto the display electrodes to update the display device during a second period, wherein the display signals are based on the reference voltage, and the first period and the second period are at least partially overlapping.

23. The method of claim 22, further comprising:

modulating the reference voltage during the second period;

maintaining the reference voltage at a substantially constant voltage during a third period; and

providing second display signals to the display electrodes during the third period to update a display of the display device, wherein the second display signals are based on the reference voltage.

24. The method of claim 22, further comprising driving display signals onto the display electrodes during the second time period updates a display of the display device.