Correcting touch interference for active pen
AssigneeSynaptics Incorporated
InventorsTom Vandermeijden, Guozhong Shen, Ching-Hsung Wang
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Abstract
A method of capacitive sensing includes obtaining a capacitive touch profile from multiple receiver electrodes disposed in a sensing region of an input device and obtaining an active pen profile, different from the capacitive touch profile, from the multiple receiver electrodes. The method also includes adjusting, using the capacitive touch profile, the active pen profile to obtain a corrected active pen profile and determining a position of an active pen in the sensing region, using the corrected active pen profile.
Claims17
A method of capacitive sensing, comprising:
- obtaining a capacitive touch profile from a plurality of receiver electrodes disposed in a sensing region of an input device;
- obtaining an active pen profile, different from the capacitive touch profile, from the plurality of receiver electrodes;
- adjusting, using the capacitive touch profile, the active pen profile to obtain a corrected active pen profile, wherein the corrected active pen profile is obtained by adding the capacitive touch profile to the active pen profile after scaling the capacitive touch profile by a gain;
- and
- determining a position of an active pen in the sensing region, using the corrected active pen profile.
An input device, comprising:
- a plurality of receiver electrodes disposed in a sensing region;
- and
- a processing system configured to:
- obtain a capacitive touch profile from the plurality of receiver electrodes,
- obtain an active pen profile, different from the capacitive touch profile, from the plurality of receiver electrodes,
- adjust, using the capacitive touch profile, the active pen profile to obtain a corrected active pen profile, wherein the corrected active pen profile is obtained by adding the capacitive touch profile to the active pen profile after scaling the capacitive touch profile by a gain, and
- determine a position of an active pen in the sensing region, using the corrected active pen profile.
A non-transitory computer-readable medium having processor-executable instructions stored thereon, wherein the processor-executable instructions, when executed, facilitate performance of the following:
- obtaining a capacitive touch profile from a plurality of receiver electrodes disposed in a sensing region of an input device;
- obtaining an active pen profile, different from the capacitive touch profile, from the plurality of receiver electrodes;
- adjusting, using the capacitive touch profile, the active pen profile to obtain a corrected active pen profile, wherein the corrected active pen profile is obtained by adding the capacitive touch profile to the active pen profile after scaling the capacitive touch profile by a gain;
- and
- determining a position of an active pen in the sensing region, using the corrected active pen profile.
Dependencies are inferred from the claim text.