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US Patent 11157113 Self-mixing interference based sensors for characterizing touch input

Patent 11157113 was granted and assigned to Apple (company) on October, 2021 by the United States Patent and Trademark Office.

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Patent abstract

Disclosed herein are electronic devices having touch input surfaces. A user's touch input or press on the touch input surface is detected using a set of lasers, such as vertical-cavity surface-emitting lasers (VCSELs) that emit beams of light toward the touch input surface. The user's touch causes changes in the self-mixing interference within the VCSEL of the emitted light with reflected light, such as from the touch input surface. Deflection and movement (e.g., drag motion) of the user's touch is determined from detected changes in the VCSELs' operation due to the self-mixing interference.

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