Image Sensor Shielding Circuit for Magnetic Noise Reduction
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Solution Overview
Problem
Image sensing devices face noise issues due to magnetic fields generated in the substrate, which affect image quality and data integrity.
Innovation Solution
An image sensing device is designed with a shielding device that includes a sensing circuit to detect magnetic fields and an offset circuit to generate a counteracting magnetic field, reducing noise by amplifying detected voltages and inducing a second magnetic field that opposes the first magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a second substrate is positioned adjacent to the first substrate, then integration and miniaturization are achieved, but magnetic fields are generated affecting image quality
Solution Approach 1:
A shielding device is introduced as an intermediary component between the first substrate (image sensor) and the second substrate (logic circuit). This shielding device includes a sensing circuit that detects magnetic fields generated by the second substrate and an offset circuit that generates counteracting magnetic fields to neutralize the harmful magnetic field effects on the image sensor.
Solution Approach 2:
The shielding device performs preliminary anti-action by detecting magnetic fields before they significantly affect the image quality and generating offset magnetic fields in advance to counteract the harmful magnetic fields. The sensing circuit continuously monitors the magnetic field environment and the offset circuit pre-compensates for magnetic field interference.
2Device complexity
If CMOS fabrication technology is used to integrate photosensitive elements and signal processing circuitry, then miniaturization and cost reduction are achieved, but magnetic field interference increases
Solution Approach 1:
The device is segmented into distinct functional substrates: the first substrate contains the image sensor array, while the second substrate contains the logic circuitry. This segmentation allows each substrate to be optimized for its specific function while reducing mutual interference through the shielding device positioned between them.
Solution Approach 2:
The shielding device acts as an intermediary between the integrated substrates, enabling high-level integration while protecting the image sensor from magnetic field interference generated by the logic circuitry on the second substrate.
3Productivity
If magnetic fields are generated in the substrate for signal processing, then signal processing functionality is enhanced, but noise in image data increases
Solution Approach 1:
The shielding device implements a feedback mechanism where the sensing circuit continuously detects magnetic field levels generated during signal processing operations, and the offset circuit adjusts the counteracting magnetic field strength accordingly to maintain image data quality while preserving signal processing functionality.
Solution Approach 2:
The shielding device serves as an intermediary that allows signal processing operations to proceed with enhanced functionality while simultaneously neutralizing the magnetic field noise that would otherwise degrade image data quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces noise in image data by counteracting the magnetic field effects, thereby improving image quality and data integrity.
Implementation Method 1
the first voltage includes a Hall effect voltage generated by the first magnetic field provided in a direction perpendicular to the first current
Implementation Method 2
an offset circuit configured to generate, based on the first voltage, a second magnetic field that counteracts the first magnetic field
Data Source
AI summary
An image sensing device includes a first substrate configured to include a plurality of unit pixels configured to detect incident light to produce pixel signals carrying image information in the incident light, a second substrate positioned adjacent to the first substrate and including a structure that generates a first magnetic field at the first substrate affecting the plurality of unit pixels and at least one shielding device disposed between the first substrate and the second substrate, wherein the shielding device includes a sensing circuit configured to detect a first voltage corresponding to the first magnetic field and an offset circuit configured to generate, based on the first voltage, a second magnetic field that counteracts the first magnetic field.