Display interference mitigation

Patent metadata

Field	Value
Publication number	US-11294505-B2
Application number	US-202016905780-A
Country	US
Kind code	B2
Filing date	Jun 18, 2020
Priority date	Sep 27, 2019
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A sensor driver comprises a receiver and an interference mitigation element. The receiver is configured to acquire a resulting signal from a sensor electrode. The interference mitigation element is communicatively coupled with the receiver and is configured to receive interference data, generate an interference estimate from the interference data and a transfer function, and communicate the interference estimate to the receiver. The interference estimate removes charge from a resulting signal, mitigating effects of interference within the resulting signal.

First claim

What is claimed is:

1. A sensor driver comprising:
a receiver circuit configured to acquire a resulting signal from a sensor electrode, wherein the resulting signal comprises noise and a signal indicative of presence of an input object; and
an interference mitigation circuit communicatively coupled with the receiver circuit, the interference mitigation circuit configured to:
receive interference data, wherein the interference data is display data;
generate, by applying a transfer function to the interface data, an interference estimate, wherein the transfer function models circuit characteristics of a source driver system including a source driver of a display driver and the sensor electrode; and
communicate the interference estimate to the receiver circuit,

wherein the receiver circuit receives the resulting signal and removes the noise therefrom at the receiver circuit according to the interference estimate.

2. The sensor driver of claim 1 , wherein the interference mitigation circuit is configured to be coupled to the display driver, and wherein the interference data is received from the display driver.

3. The sensor driver of claim 2 , wherein the interference mitigation circuit is configured to be coupled to the source driver of the display driver, and the display data is a subpixel data signal received from the source driver.

4. The sensor driver of claim 1 , wherein the interference mitigation circuit comprises:
an adaptive filter configured to receive the interference data and generate the interference estimate.

5. The sensor driver of claim 4 , wherein the adaptive filter is further configured to receive sensor data corresponding to the resulting signal from the receiver circuit, and the interference estimate is further based on the sensor data.

6. The sensor driver of claim 5 , wherein the adaptive filter is a finite impulse response structure.

7. The sensor driver of claim 6 , wherein the finite impulse response structure comprises filter coefficients, and wherein the filter coefficients are adjusted based on the sensor data.

8. The sensor driver of claim 1 , wherein the transfer function further corresponds to one or more circuit characteristics selected from the group consisting of a data line of a display panel and a reference electrode of the display panel.

9. An input device comprising:
a sensor electrode; and
a processing system comprising:
a sensor driver communicatively coupled to the sensor electrode, the sensor driver comprising:
a receiver circuit configured to acquire a resulting signal from the sensor electrode, wherein the resulting signal comprises noise and a signal indicative of presence of an input object; and
an interference mitigation circuit communicatively coupled with the receiver circuit, the interference mitigation circuit configured to:
receive interference data, wherein the interference data is display data;
generate, by applying a transfer function to the interface data, an interference estimate, wherein the transfer function models circuit characteristics of a source driver system including a source driver of a display driver and the sensor electrode; and
communicate the interference estimate to the receiver circuit,

wherein the receiver circuit receives the resulting signal and removes the noise therefrom at the receiver circuit according to the interference estimate.

10. The input device of claim 9 , wherein the interference mitigation circuit is configured to be coupled to the display driver, and wherein the interference data is received from the display driver.

11. The input device of claim 10 , wherein the interference mitigation circuit is configured to be coupled to the source driver of the display driver, and the display data is a subpixel data signal received from the source driver.

12. The input device of claim 9 , wherein the interference mitigation circuit comprises an adaptive filter configured to receive the interference data and generate the interference estimate.

13. The input device of claim 12 , wherein the adaptive filter is further configured to receive sensor data corresponding to the resulting signal from the receiver circuit and the interference estimate is further generated based on the sensor data.

14. The input device of claim 13 , wherein the adaptive filter is a finite impulse response structure.

15. The input device of claim 14 , wherein the finite impulse response structure comprises filter coefficients, and wherein the filter coefficients are adjusted based on the sensor data.

16. The input device of claim 9 , wherein the transfer function further corresponds to one or more circuit characteristics selected from the group consisting of a data line of a display panel and a reference electrode of the display panel.

17. A method for mitigating interference, the method comprising:
acquiring, by a receiver circuit, a resulting signal from a sensor electrode, wherein the resulting signal comprises noise and a signal indicative of presence of an input object;
receiving, by an interference mitigation circuit, interference data, wherein the interference data is display data;
generating, by the interference mitigation circuit applying a transfer function to the interface data, an interference estimate, wherein the transfer function models circuit characteristics of a source driver system including a source driver of a display driver and the sensor electrode;
communicating the interference estimate from the interference mitigation circuit to the receiver circuit;
receiving, at the receiver circuit, the resulting signal; and
removing, at the receiver circuit, the noise from the resulting signal according to the interference estimate.

18. The method of claim 17 , wherein the interference data is received from the display driver.

19. The method of claim 17 further comprising receiving, by an adaptive filter of the interference mitigation circuit, sensor data corresponding to the resulting signal from the receiver circuit, and wherein the interference estimate is further generated based on the sensor data.

20. The method of claim 19 , wherein the adaptive filter is a finite impulse response structure having filter coefficients, and wherein the filter coefficients are adjusted based on sensor data.

Assignees

• Synaptics Inc

Inventors

• Losh Jonathan
• Solven Derek
• Petrovic Vladan

Classifications

• G06F3/0418 Primary

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F3/0444

  using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners · 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

• G06F3/0443 Primary

  using a single layer of sensing electrodes · CPC title

• G06F3/0445

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title