Proximity sensor and operation method thereof
US11226400B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2020 |
| Grant date | Jan 18, 2022 |
| Priority date | — |
| Expiry date | Aug 25, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F55/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A proximity sensor includes a substrate, a light source, a finger electrode, an active layer, and a transparent electrode layer. The substrate has opposite top and bottom surfaces. The light source faces toward the bottom surface of the substrate. The finger electrode is located on the top surface of the substrate, and has finger portions and gaps between every two adjacent finger portions. The active layer covers the finger electrode, and is located in the gaps. The transparent electrode layer is located on the active layer. When the light source emits light, the light through the gaps sequentially passes through the active layer and the transparent electrode layer onto a reflective surface. The light is reflected by the reflective surface to form reflected light, and the reflected light passes through the transparent electrode layer and is received by the active layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.