Ambient light sensor
US10412813B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2019 |
| Grant date | Sep 10, 2019 |
| Priority date | — |
| Expiry date | Feb 12, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An ambient light sensor is provided, which includes a photoelectric component, a variable capacitor, an operational amplifier, a comparator, a pulse generator circuit and a pulse accumulator circuit. The photoelectric component converts light energy into a photocurrent. The variable capacitor is connected between a first input terminal and an output terminal of the operational amplifier. A capacitance of the variable capacitor is adjusted according to the photocurrent. The operational amplifier outputs an amplified error signal based on a difference between an input voltage at its first input terminal and a reference voltage at its second input terminal. The comparator compares the amplified error signal with the reference voltage to output a comparison signal. The pulse generator circuit outputs a pulse signal based on the comparison signal. The accumulator circuit accumulates the number of counts that the input voltage is increased to a voltage larger than the reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.