High-sensitivity light sensor and sensing method thereof comprising a plurality of comparator circuits, reset circuits and counter circuits
US11774284B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2023 |
| Grant date | Oct 3, 2023 |
| Priority date | — |
| Expiry date | Apr 4, 2043 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A high-sensitivity light sensor includes a light sensing element, a first integrator, a comparator, and a second integrator. The light sensing element senses a light during a measurement time interval to generate a current. The first integrator integrates the current to generate a first integration signal. The comparator compares the first integration signal with a threshold value. While the first integration signal is greater than the threshold value, the comparison signal is at a first level. The second integrator is coupled to the first integrator and integrates the first integration signal to generate a second integration signal. The light sensor of the present invention uses two integrators to integrate the sensed voltage twice. Therefore, the light sensor of the present invention has a higher sensitivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.