Optical proximity sensor with self-compensation for ambient light and crosstalk using light-to-frequency conversion technique
US11467268B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 23, 2019 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Aug 11, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/74
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosures of the present invention describe an optical proximity sensor, which is particularly designed to have functionality of canceling an ambient light noise and/or an optical crosstalk noise by using light-to-frequency conversion technique, and comprises: a controlling and processing circuit, a lighting unit, a light receiving unit, an analog adder, a first DAC unit, a second DAC unit, and a light-to-digital conversion (LDC) unit. In the controlling of the controlling and processing circuit, the first DAC unit and the second DAC unit would respectively generate a first compensation current signal and a second compensation current signal to the analog adder, such that a noise signal of ambient light and a noise signal of optical crosstalk existing in an optical current signal of object reflection light would be canceled by the two compensation current signals in the analog adder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.