Pixel Control Signal Verification Circuitry for Imaging Reliability
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Solution Overview
Problem
Existing imaging systems face challenges in generating repeatable verification signals to test the components of the imaging system, which can add complexity and cost to manufacturing, particularly in critical applications like vehicle safety systems where continuous monitoring of imaging system components is necessary.
Innovation Solution
Incorporating row control signal verification circuitry within the image sensor array that compares pixel control signals with predetermined standards to ensure correct operation, allowing for continuous on-the-fly verification during image capture, and providing indicators for potential issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate and dedicated verification system is provided to test imaging system components, then verification reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The verification circuit is merged with the image sensor array, sharing the same substrate and circuit resources. The verification circuit uses the same pixel control signals and readout pathways as the imaging pixels, eliminating the need for separate verification hardware and reducing overall system complexity while maintaining verification capability
Solution Approach 2:
The image sensor array serves dual functions: capturing images during normal operation and performing verification functions when activated. The verification circuit reuses existing imaging components including pixel control circuitry, readout amplifiers, and data pathways, allowing one system to perform multiple functions without requiring dedicated separate components
2Reliability
If a separate and dedicated verification system is provided to test imaging system components, then verification reliability is improved, but manufacturing cost increases
Solution Approach 1:
The verification circuit is integrated onto the same substrate as the image sensor array, sharing manufacturing processes and materials. This consolidation eliminates the need for separate verification component assembly and reduces overall manufacturing complexity and cost
Solution Approach 2:
The system uses existing imaging components for verification purposes, eliminating the need to manufacture and assemble separate dedicated verification hardware. The same pixel array, control circuitry, and readout pathways serve both imaging and verification functions, reducing component count and manufacturing cost
3Reliability
If continuous verification of pixel control signals is performed, then system reliability is improved, but processing time and computational load increase
Solution Approach 1:
The verification circuit operates continuously during image capture, performing verification checks on pixel control signals in real-time without interrupting the imaging process. This continuous monitoring ensures immediate detection of signal errors while maintaining uninterrupted image acquisition
Solution Approach 2:
The verification circuit compares pixel control signals against expected values and provides immediate feedback on signal integrity. This feedback mechanism enables real-time detection and reporting of control signal errors without requiring additional processing time or computational resources beyond the comparison operation
Data Source
AI summary
Imaging systems may be provided with image sensors having an array of image pixels coupled to row control circuitry and verification circuitry. The row control circuitry may provide row control signals to the image pixels for capturing image data. The verification circuitry may receive the row control signals through the array of image pixels. The verification circuitry may identify predetermined ranges of acceptable row control signal magnitudes based on the type of row control signal and the mode of operation of the image sensor. The verification circuitry may be configured to compare row control signal magnitudes to the predetermined acceptable ranges. If the row control signal magnitudes are outside of one or more of the predetermined ranges, circuitry in the imaging system may be shut off and/or a fault signal such as an audible or visible failure alert signal may be produced for an operator of imaging system.