Angle sensing using the Talbot effect, an imaging sensor, and phase/quadrature demodulation
US11722654B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2022 |
| Grant date | Aug 8, 2023 |
| Priority date | — |
| Expiry date | May 31, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2013/0081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The techniques disclosed herein may be utilized to detect, measure, and/or compensate for misalignments of a display that may occur after manufacturing. A Talbot sensor is described that includes a diffraction device and an image sensor. Captured images from the image sensor include pixel data values that include bright and dark spots that represent a diffraction pattern associated with the Talbot sensor. A demodulator multiplies the pixel data values with sine and cosine reference images to generate averaged in-phase and quadrature values, which can be used to determine a phase angle for incident light on the Talbot sensor. Phase angle changes over time indicate changes in the alignment of the display, which may be corrected by display parameter manipulation. The resulting devices, systems and methods provide for portable solutions, with reduced cost of manufacturing, reduced part costs, and reduced complexity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.