Image Sensor Output Line Interleaving for Crosstalk Noise Reduction
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Solution Overview
Problem
Existing image sensing apparatuses face challenges in reducing noise attributed to crosstalk when the spacings between output lines are decreased, leading to increased crosstalk noise components that cannot be effectively mitigated by existing arrangements.
Innovation Solution
The proposed image sensing apparatus arranges output lines such that the first output line is between the third and fourth output lines, and the third output line is between the first and second output lines, allowing for equalization of noise components attributed to crosstalk, thereby reducing noise even when spacings are minimized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the spacings between output lines are decreased to reduce chip size, then the chip size is reduced, but the crosstalk noise between output lines increases
Solution Approach 1:
The patent segments the output lines into distinct groups (S output lines for optical signals and N output lines for noise signals) and arranges them in a specific interleaved pattern. This segmentation allows for targeted noise management where N lines serve as reference signals to cancel crosstalk on adjacent S lines, enabling closer spacing while maintaining signal integrity
Solution Approach 2:
The patent introduces N output lines carrying noise signals as intermediary elements between S output lines. These N lines act as mediators that provide reference signals for crosstalk cancellation processing, allowing the system to tolerate smaller spacings between output lines by actively compensating for the increased crosstalk through signal processing
2Area of stationary object
If the first N output line is arranged adjacent to the second S output line to reduce spacing, then the chip size is reduced, but the crosstalk noise on the first N output line becomes unequal to the crosstalk noise on the first S output line, making noise cancellation ineffective
Solution Approach 1:
The patent employs an asymmetric arrangement where N output lines are positioned adjacent to S output lines in a specific pattern (first N adjacent to first S, second N adjacent to second S, etc.). This asymmetric positioning ensures that each N line experiences crosstalk conditions that match its paired S line, enabling effective noise cancellation while maintaining compact dimensions
Solution Approach 2:
The patent applies local quality by ensuring that each N output line is specifically positioned to match the crosstalk characteristics of its corresponding S output line. This localized matching of noise conditions allows for precise noise cancellation on a per-channel basis, maintaining accuracy even with reduced spacing between lines
Data Source
AI summary
An image sensing apparatus includes an output unit including a first output line which transmits a first signal of the first pixel, a second output line which transmits a second signal of the first pixel, a third output line which transmits a first signal of the second pixel, a fourth output line which transmits a second signal of the second pixel, a first difference circuit which operates the difference between the first signal and the second signal of the first pixel to generate a first image signal, and a second difference circuit which operates the difference between the first signal and the second signal of the second pixel to generate a second image signal, wherein the first output line is arranged between the third output line and the fourth output line, and the third output line is arranged between the first output line and the second output line.