CMOS image sensor pixel structure based on bionic vision

Abstract

The invention relates to the technical field of CMOS image sensors, and provides a CMOS image sensor pixel structure based on bionic vision. The structure comprises a color signal collection unit, a black and white signal collection unit, a third transfer transistor TG3, a reset transistor RST, a source follower SF and a row selection transistor RS; the black and white signal collection unit comprises a first clamping photodiode PPD1, a first transfer transistor TG1 and a first floating diffusion capacitor FD1; and the color signal collection unit comprises a second clamping photodiode PPD2, asecond transfer transistor TG2 and a second floating diffusion capacitor FD2. According to the CMOS image sensor pixel structure of the invention, high-sensitivity black and white image signals and color image signals can be respectively obtained in the same CMOS image sensor.

Description

technical field [0001] The invention relates to the technical field of CMOS image sensors, in particular to a bionic vision-based CMOS image sensor pixel structure. Background technique [0002] With the rapid development of semiconductor technology, the application range of CMOS image sensors has been expanded to the fields of smart cars, monitoring and security, machine vision and consumer products. Especially in low-light imaging applications, parameters such as full well capacity, noise, dynamic range, sensitivity, and signal-to-noise ratio will directly affect the imaging effect. In order to improve the imaging performance of the camera in the low-light environment, an image processing technology for dark field enhancement is realized by weighting the dark field black-and-white image and the dark field color image. [0003] At present, in order to obtain a high-responsive black-and-white image and a color image, a combination of a color camera and a black-and-white cam...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problem that black-and-white image signals and color image signals cannot be simultaneously obtained on the CMOS image sensor of the prior art, and proposes a CMOS image sensor pixel structure based on bionic vision to obtain high sensitivity in the same CMOS image sensor respectively black and white image signal and color image signal

Images