Cmos image sensor with black level compensation function and black level compensation method
By setting up four corner pixel subarrays and top and bottom rows of an opaque shield in a CMOS image sensor, combined with a black level compensation algorithm, the shadow problem caused by uneven dark current was solved, thus improving image quality.
CN115550571BActive Publication Date: 2026-06-26SMARTSENS TECH (SHANGHAI) CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SMARTSENS TECH (SHANGHAI) CO LTD
- Filing Date
- 2021-06-29
- Publication Date
- 2026-06-26
AI Technical Summary
Technical Problem
Existing CMOS image sensors suffer from dark current inhomogeneity during imaging, resulting in vertical and horizontal shadows that affect image quality.
Method used
The black level compensation method is adopted. By setting the four corner pixel sub-arrays and a few top and bottom rows of the opaque shield in the pixel array of the image sensor, a black level compensation algorithm is generated. Combined with the analog-to-digital converter and the black level compensation circuit, the black level changes between pixels are adjusted.
Benefits of technology
It effectively reduces vertical and horizontal shadows in images, improves image fidelity and contrast, and ensures the accuracy of image data.
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Smart Images
Figure CN115550571B_ABST
Abstract
The present application provides a kind of image sensor with black level compensation function, comprising: for generating analog image signal pixel main array;Active pixel array in the pixel main array, imaging lens focuses incident light on the active pixel array;Four corner pixel subarrays, each corner pixel subarray is located in one of the four corners of the active pixel array, opaque shield is above its photodiode to prevent the generation of charge related to incident light, these corner pixel subarrays provide black level compensation analog image signal;Analog-to-digital converter circuit and black level compensation circuit, black level compensation circuit compensates the black level variation between the pixels of the active pixel array by algorithm.The present application adopts black level compensation method to solve the image shadow of image sensor caused by various factors.The present application also provides an image sensor black level compensation method.
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