Self-mixing interference based sensors for characterizing touch input
US11157113B2 · kind B2 · utility
17Cited by
8References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2019 |
| Grant date | Oct 26, 2021 |
| Priority date | — |
| Expiry date | Apr 12, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/423
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.