Photoelectric Conversion System Offset Correction Circuit
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Solution Overview
Problem
Existing photoelectric conversion systems with multiple devices struggle to correct differences in offset components, leading to variations in signal output due to component variations, manufacturing irregularities, temperature differences, and power source voltage variations, which degrade image quality by causing level differences in luminance.
Innovation Solution
The system employs a signal generation circuit to produce reference signals that are amplified and used to correct differences in offset components by generating and processing pixel signals through signal processing circuits connected to output circuits, ensuring that all input nodes receive a common signal based on the reference signal, thereby reducing the impact of offset variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple photoelectric conversion devices are used to increase productivity, then the output signal quantity increases, but offset component differences cause luminance level variations that degrade image quality
Solution Approach 1:
The patent introduces a feedback mechanism where the correction signal generation circuit receives pixel signals from multiple photoelectric conversion devices, generates correction signals based on offset component differences, and feeds these correction signals back to correct the pixel signals. This closed-loop feedback system continuously compensates for offset variations, ensuring luminance consistency while maintaining high productivity from multiple devices
Solution Approach 2:
The patent changes the electrical parameters (voltage levels) of the pixel signals by adding correction signals that compensate for offset component differences. The correction signal generation circuit dynamically adjusts the voltage parameters of the output signals based on detected offset variations, thereby transforming the signals to eliminate luminance level discrepancies while preserving the benefits of using multiple photoelectric conversion devices
2Reliability
If common fixed voltage is supplied to signal readout paths to reduce noise, then signal stability improves, but offset component differences among paths still cause luminance variations
Solution Approach 1:
The patent applies local quality by providing individualized correction signals to each signal readout path based on its specific offset component characteristics. Rather than treating all paths uniformly, the correction signal generation circuit analyzes and compensates for path-specific offset variations, ensuring that each path receives tailored correction while maintaining overall system stability through the common fixed voltage supply
3Adaptability or versatility
If photoelectric conversion devices are arranged on different semiconductor substrates to increase adaptability, then system versatility improves, but component variations and temperature differences exacerbate offset component differences
Solution Approach 1:
The patent introduces a mediator (the correction signal generation circuit) that acts as an intermediary between multiple photoelectric conversion devices on different substrates and the final image output. This mediator receives signals from diverse sources with varying offset characteristics, processes them to eliminate offset component differences, and produces corrected output signals, thereby enabling the system to integrate diverse substrates while maintaining luminance consistency
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 approach effectively reduces the influence of offset component differences across photoelectric conversion devices, resulting in consistent image quality with reduced level differences in luminance, especially in low-luminance conditions.
Implementation Method 1
pixels for generating signals from incident light through photoelectric conversion
Data Source
AI summary
A photoelectric conversion system is configured to correct a difference in offset component of signals to be outputted per photoelectric conversion device.