Nanostructured Spectral Filter Radial Orientation
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Solution Overview
Problem
Nanostructured spectral filters in image sensors and displays exhibit varying spectral responses due to the angle of incidence and position of light, leading to non-uniform image capture across the pixel array.
Innovation Solution
The filtering cells are oriented with a preferential direction radially or ortho-radially with respect to the center or optical axis of the image sensor, ensuring consistent spectral response by aligning the pattern with the azimuthal angle of incoming light, thus making the response independent of the cell's position and angle of incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If filtering cells are arranged in a regular grid pattern, then manufacturing is simplified, but spectral response becomes non-uniform across the array due to varying angles of incidence
Solution Approach 1:
The patent applies local quality by orienting the nanostructured pattern in each filtering cell according to its specific position in the array. Cells at different locations have their patterns rotated to align with the local angle of incidence, ensuring uniform spectral response across the entire filter array while maintaining a regular grid layout for ease of manufacturing.
2Device complexity
If filtering cells use fixed orientation patterns, then manufacturing complexity is reduced, but spectral response varies with angle of incidence
Solution Approach 1:
Each filtering cell is assigned a local orientation angle based on its position in the array. This local quality approach ensures that cells experiencing different angles of incidence have appropriately oriented patterns, maintaining spectral response consistency without requiring complex global pattern adjustments.
3Ease of manufacture
If all filtering cells are oriented in the same direction, then manufacturing processes are simplified, but image capture uniformity deteriorates across different field positions
Solution Approach 1:
The patent implements local quality by varying the orientation of nanostructured patterns in filtering cells based on their position within the array. Cells at the center have one orientation while cells at the periphery are rotated to compensate for oblique light angles, ensuring uniform image capture across the entire field of view while maintaining compatibility with standard manufacturing processes.
Data Source
AI summary
A spectral filter includes an assembly of filtering cells. Each cell has a same nanostructured pattern and a preferential direction of the pattern. This preferential direction is, for each cell, oriented approximately radially with respect to a single point of the spectral filter. Alternatively, this preferential direction is, for each cell, oriented approximately ortho-radially with respect to the single point of the spectral filter. The single point may be a center point. Alternatively, the single point may correspond to an optical axis of a lens element associated with the spectral filter.