Image Pickup Module Loop Conductor Noise Reduction
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Solution Overview
Problem
As image sensors with improved ISO sensitivity capture clearer images in low light, they become susceptible to magnetic field noise, leading to image disturbances such as smear or shading, and existing methods to reduce noise by increasing electrical resistance in wiring result in voltage drops and image quality issues.
Innovation Solution
The image pickup module incorporates a loop structure of conductors connected in parallel to the ground pattern, reducing the resistance ratio and induced noise voltage, while maintaining optimal voltage levels for pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the electrical resistance value of peripheral ground wiring is increased to reduce magnetic field noise, then noise resistance is improved, but voltage drop increases and image quality deteriorates
Solution Approach 1:
The ground wiring is divided into two distinct types: pixel ground wiring with low electrical resistance for voltage supply, and peripheral ground wiring with high electrical resistance for noise reduction. This segmentation allows each wiring type to optimize its electrical resistance independently for its specific function, resolving the contradiction between noise resistance and image quality
Solution Approach 2:
Different electrical resistance characteristics are applied to different locations and functions within the ground wiring system. The pixel ground wiring maintains low resistance locally to ensure proper voltage supply to pixels, while the peripheral ground wiring has high resistance locally to reduce magnetic field noise interference, thereby achieving both noise resistance and image quality
2Object-affected harmful factors
If the electrical resistance value of wiring is increased to reduce noise, then noise interference is reduced, but voltage applied to pixels becomes lower than reference voltage
Solution Approach 1:
The ground wiring system is segmented into pixel ground wiring and peripheral ground wiring with different electrical resistance values. The pixel ground wiring has low resistance to maintain stable voltage supply to pixels, while the peripheral ground wiring has high resistance to reduce noise interference, thus resolving the contradiction between noise reduction and voltage stability
Solution Approach 2:
Different electrical resistance properties are assigned to different wiring locations based on their functional requirements. The pixel ground wiring located near pixels has low resistance for reliable voltage supply, while the peripheral ground wiring located at the periphery has high resistance for noise reduction, achieving both noise immunity and voltage reliability
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 configuration effectively reduces noise interference and maintains image quality by minimizing voltage drops, preventing smear or shading in images captured by the image sensor.
Implementation Method 1
A loop structure of conductor including the first conductive pattern, the second conductive pattern, the first connection conductor portion, and the second connection conductor portion is formed as viewed in the first direction
Data Source
AI summary
An image pickup module includes a first base body, a pixel portion, a first conductive pattern, a second base body, a second conductive pattern, and a conductor portion. The pixel portion is provided in the first base body and includes a plurality of pixels arranged in a first direction and a second direction. The first conductive pattern is provided in the first base body. The first base body is provided on the second base body. The second conductive pattern is provided in the second base body and electrically connected to the first conductive pattern via a first connection conductor portion and a second connection conductor portion. A loop structure including the first conductive pattern, the second conductive pattern, the first connection conductor portion, and the second connection conductor portion is formed as viewed in the first direction. The conductor portion is connected in parallel to the first conductive pattern.