System and method for interference mitigation in a sensing device
A controller for a sensor is configured to receive a control signal from an external device, the control signal corresponding to potential interference. The controller adjusts a sensing parameter using the control signal to avoid the potential interference. The potential interference is at least one of an electrical interference and an optical interference. The controller may include a sensor module that includes circuitry configured to acquire resulting signals with sensing elements using the adjusted sensing parameter.
1. A sensor controller comprising:
an input terminal configured to receive a control signal, the control signal corresponding to potential interference;
a sensor module comprising circuitry configured to acquire resulting signals from a plurality of sensing elements during one or more image frames of an image based at least in part on a sensing parameter, the sensing parameter comprising at least one parameter selected from the group consisting of a resulting signals acquisition start time, a resulting signals acquisition end time, a resulting signals pause, a sensing direction, a length of one of the one or more image frames, and a number of the one or more image frames; and
a sensing parameter adjuster comprising circuitry configured to adjust the sensing parameter based at least in part on the control signal to at least mitigate the potential interference.
2. The controller of claim 1 , wherein the control signal is at least one signal selected from the group consisting a horizontal sync signal, a vertical sync signal, a data enable signal, and a brightness control signal.
3. The controller of claim 1 , wherein the control signal is at least one signal selected from the group consisting of a sensing frequency signal, a status signal, an interference signal, and a timing signal.
4. The controller of claim 1 , wherein the potential interference is at least one selected from the group consisting of electrical interference and optical interference.
5. The controller of claim 1 , wherein adjusting the sensing parameter comprises at least one selected from the group consisting of adjusting the length of one of the one or more image frames and adjusting the number of the one or more image frames.
6. The controller of claim 1 , wherein the sensing parameter further comprises a sensing frequency, and wherein adjusting the sensing parameter comprises adjusting from driving a first sensing element of the plurality of sensing elements with a first sensing signal having a first frequency to driving the first sensing element with a second sensing signal having a second frequency different from the first frequency.
7. The controller of claim 1 , wherein at least mitigating the potential interference comprises at least partially minimizing effects of the potential interference on the resulting signals.
8. The controller of claim 1 , wherein the plurality of sensing elements is at least one selected from the group consisting of optical sensing elements and capacitive sensor electrodes.
9. A method for avoiding potential interference in a sensor, the method comprising:
receiving, at an input terminal of the sensor, a control signal corresponding to the potential interference;
adjusting a sensing parameter of the sensor based at least in part on the control signal to at least mitigate the potential interference; and
acquiring resulting signals from a plurality of sensing elements during one or more image frames of an image based at least in part on the adjusted sensing parameter, the sensing parameter comprising at least one parameter selected from the group consisting of a resulting signals acquisition start time, a resulting signals acquisition end time, a resulting signals pause, a sensing direction, a length of one of the one or more image frames, and a number of the one or more image frames.
10. The method of claim 9 , wherein the control signal is at least one signal selected from the group consisting a horizontal sync signal, a vertical sync signal, a data enable signal, and a brightness control signal.
11. The method of claim 9 , wherein the control signal is at least one signal selected from the group consisting of a sensing frequency signal, a status signal, an interference signal, and a timing signal.
12. The method of claim 9 , wherein the sensing parameter further comprises a sensing frequency, and wherein adjusting the sensing parameter further comprises adjusting from driving a first sensing element of the plurality of sensing elements with a first sensing signal having a first frequency to driving the first sensing element with a second sensing signal having a second frequency different from the first frequency.
13. The method of claim 9 , wherein adjusting the sensing parameter comprises at least one selected from the group consisting of adjusting the length of one of the one or more image frames and adjusting the number of the one or more image frames.
14. An input device comprising:
one or more sensing elements; and
a sensor controller coupled to the one or more sensing elements, and comprising a first input terminal and a sensing parameter, the sensor controller configured to:
receive, at the first input terminal, a control signal corresponding to potential interference;
adjust the sensing parameter based at least in part on the control signal, the sensing parameter comprising at least one parameter selected from the group consisting of a resulting signals acquisition start time, a resulting signals acquisition end time, a resulting signals pause, a sensing direction, a length of one of one or more image frames, and a number of the one or more image frames; and
acquire resulting signals with the one or more sensing elements during the one or more image frames of an image.
15. The input device of claim 14 further comprising a display device, wherein the display device is between the one or more sensing elements and an input surface.
16. The input device of claim 14 , wherein the one or more sensing elements are one of optical sensing elements and capacitive sensor electrodes.
17. The input device of claim 14 , wherein adjusting the sensing parameter comprises at least one selected from the group consisting of adjusting the length of one of the one or more image frames and adjusting the number of the one or more image frames.
18. The sensor controller of claim 1 , wherein a fingerprint image is determined from the resulting signals.
19. The method of claim 9 , wherein a fingerprint image is determined from the resulting signals.
20. The input device of claim 14 , wherein a fingerprint image is determined from the resulting signals.