Air Layer Grid Structures for CMOS Image Sensor Crosstalk Reduction
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Solution Overview
Problem
Current image sensing devices face challenges in minimizing signal deviation between pixels while maintaining structural stability, particularly due to crosstalk issues between color filters in CMOS image sensing devices.
Innovation Solution
The implementation of grid structures with air layers, including first, second, and third air layers structurally separate from each other, is introduced to enhance the structural stability of the grid structure and reduce signal deviation between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If grid structures with air layers are introduced to reduce signal deviation between pixels, then measurement precision is improved, but structural stability deteriorates due to pressure concentration
Solution Approach 1:
The patent divides the single continuous air layer into multiple separate air layers (first air layer, second air layer, third air layer) that are structurally separated from each other. This segmentation prevents pressure concentration in one location, thereby maintaining structural stability while still achieving the goal of minimizing signal deviation between pixels through the distributed air layer configuration.
Solution Approach 2:
The patent applies different grid structures with air layers at different locations within the color filter block. The first grid structures are disposed between color filter blocks in the first direction, the second grid structures between color filter blocks in the second direction, and the third grid structure between color filters within each color filter block. This local differentiation optimizes both signal deviation reduction and structural stability at each specific location.
2Reliability
If grid structures with air layers are used to improve image sensing performance, then reliability is improved by reducing signal deviation, but device complexity increases due to multiple separate air layers
Solution Approach 1:
The patent segments the air layer system into multiple structurally separate air layers (first, second, and third air layers) positioned at different locations. While this increases structural complexity, it significantly improves reliability by preventing signal deviation between pixels through distributed pressure management and reduced crosstalk.
Solution Approach 2:
The grid structures with air layers act as intermediary elements between the color filters and the photosensing pixels. These intermediaries reduce direct interaction and crosstalk between adjacent color filters, thereby improving signal consistency and reliability across the image sensor array.
Data Source
AI summary
An image sensing device includes a plurality of color filter blocks, each of which includes a plurality of color filters arranged adjacent to each other in a first direction and a second direction perpendicular to the first direction and having the same color, first grid structures including a first air layer and disposed between the color filter blocks adjacent to each other in the first direction; second grid structures including a second air layer and disposed between the color filter blocks adjacent to each other in the second direction, and a third grid structure including a third air layer and disposed between the color filters within each of the color filter blocks. The first to third air layers are structurally separate from each other.