Color Filter Array Isolation Wall with Air Spaces
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Solution Overview
Problem
Current color image sensors experience crosstalk due to incident light angles, leading to interference between adjacent color filters, which reduces optical efficiency.
Innovation Solution
A color filter array with an isolation wall made of a solid material comprising air spaces, such as carbon nanotubes, is used to separate color filters, preventing crosstalk and enhancing optical efficiency by forming a mesh-shaped isolation wall on a substrate with a catalyst layer and disposing color filters within the openings of this wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional solid isolation wall is used to separate color filters, then mechanical strength is maintained, but optical efficiency decreases due to light blocking and refractive index differences
Solution Approach 1:
The isolation wall is designed with a porous structure containing numerous air spaces (90-99% porosity) within a solid matrix. This porous configuration allows light to pass through with minimal blocking while the solid matrix maintains mechanical strength. The air spaces reduce refractive index differences between the isolation wall and surrounding media, thereby minimizing optical interference and improving overall optical efficiency.
2Loss of energy
If a dense solid isolation wall is used to prevent crosstalk, then light blocking is minimized, but manufacturing complexity increases
Solution Approach 1:
The isolation wall's optical properties are optimized by controlling the porosity parameter to be between 90-99%. This specific parameter range creates a structure that is sufficiently porous to minimize light blocking and refractive index differences, yet maintains enough solid material to provide mechanical support and define the isolation boundaries clearly for manufacturing purposes.
3Loss of energy
If air spaces are increased in the isolation wall to reduce refractive index differences, then optical efficiency improves, but structural stability decreases
Solution Approach 1:
The isolation wall is constructed as a composite structure combining solid material (providing mechanical strength and structural stability) with air spaces (providing optical benefits). This composite approach allows the wall to simultaneously achieve high porosity (90-99%) for optimal optical performance while maintaining sufficient structural integrity through the distributed solid matrix framework.
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
The isolation wall effectively reduces crosstalk between color filters, improving light use efficiency and allowing for easier post-manufacturing processes while maintaining mechanical strength, with air spaces occupying about 90% of the wall's volume, thus minimizing refractive index differences and optimizing optical confinement.
Implementation Method 1
carbon nanotubes, the color filter array may further include a catalyst layer disposed on the substrate, and the isolation wall may be formed by growing the carbon nanotubes on the catalyst layer
Data Source
AI summary
A color filter array, a method of manufacturing the same, and an image sensor including the same are provided. The color filter array includes: a color filter arrangement including a plurality of color filters on a substrate; and an isolation wall which isolates each of the color filters and includes a solid including a plurality of air spaces.