Imaging Device Signal Path Layout for Noise Reduction
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Solution Overview
Problem
Imaging devices with multiple voltage lines suffer from noise deterioration in image quality due to different noise components being supplied to pixel signals.
Innovation Solution
The imaging device incorporates a specific layout where signal paths from pixels in different columns cross and extend within regions closer to specific voltage lines, with the crossing portions located upstream of extension portions, to minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple voltage lines with different voltages are used in the imaging device, then the functional performance and operation of the imaging device is improved, but noise components are supplied to pixel signals causing deterioration in image quality
Solution Approach 1:
The imaging device is divided into multiple regions based on proximity to different voltage lines. Signal paths are segmented to route signals from pixels in different columns through different regions, with each region being closer to a specific voltage line. This segmentation allows selective noise compensation for different signal paths.
Solution Approach 2:
Different noise compensation values are applied locally to signals depending on which region they pass through. The noise compensation value varies by region, with each region having a compensation value corresponding to the dominant voltage line noise in that area. This local quality approach allows precise noise mitigation tailored to each signal path's specific noise environment.
2Area of stationary object
If signal paths are routed closer to voltage lines for compact layout, then device area is reduced, but noise interference from voltage lines increases
Solution Approach 1:
The patent introduces a spatial dimension (region classification) to the signal path routing problem. Instead of simply minimizing distance in one dimension, signals are routed through different regions defined by their proximity to different voltage lines. This dimensional approach allows compact layout while systematically managing noise exposure through region-based compensation.
Solution Approach 2:
The system implements feedback through noise compensation values that are determined based on the region each signal path passes through. The noise compensation process uses information about the signal path's location relative to voltage lines to apply appropriate compensation, creating a feedback loop that mitigates noise interference while maintaining compact routing.
Data Source
AI summary
An imaging device including pixels including a first pixel and a second pixel, the pixels arranged in rows and columns, the first pixel belonging to a first column, the second pixel belonging to a second column adjacent the first column; a first signal path through which a signal from the first pixel flows; and a second signal path through which a signal from the second pixel flows, a first circuit including first and second lines, a first voltage being applied to the first lines, a second voltage different from the first voltage applied to the second lines. The first signal path is located in a region closer to one of the first lines than any of the second lines in a plan view, and the second signal path is located in a region closer to one of the second lines than any of the first lines in the plan view.