Patent · US Active

Pixel-level background light subtraction

US10522578B2 · kind B2 · utility

5Cited by

1References

21Claims

0Family size

Assignee

SONY SEMICONDUCTOR SOLUTIONS CORPORATION · JP

Inventors

Katsuhiko Hanzawa · San Jose, US
Jinsuk Kang · San Jose, US
Selcuk Sen · San Jose, US

Key dates

Filing date	Sep 8, 2017
Grant date	Dec 31, 2019
Priority date	—
Expiry date	Jan 11, 2038

Classification

Technology area (CPC H)Electricity
CPC primaryH10F39/807
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A pixel circuit, a method for performing a pixel-level background light subtraction, and an imaging device are disclosed. In one example of the present disclosure, the pixel circuit includes an overflow gate transistor, a photodiode, and two taps. Each tap of the two taps is configured to store a background signal that is integrated by the photodiode, subtract the background signal from a floating diffusion, store a combined signal that is integrated by the photodiode at the floating diffusion, and generate a demodulated signal based on a subtraction of the background signal from the floating diffusion and a storage of the combined signal that is integrated at the floating diffusion.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.