Mie Resonance Color Filter Array for Low-Crosstalk Imaging
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Solution Overview
Problem
The complexity and inefficiency of organic color filter manufacturing processes, particularly due to sequential patterning and thick organic color filters, lead to crosstalk issues in both image sensors and display devices when dealing with obliquely incident light.
Innovation Solution
A color filter array utilizing Mie resonance particles with a refractive index greater than 3.5, surrounded by a transparent dielectric, and separated by an isolation wall to prevent interactions, allowing for simultaneous manufacturing of color filters for all colors and reducing thickness to minimize crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic color filters are used with sequential patterning processes, then color filtering functionality is achieved, but manufacturing complexity increases and production efficiency decreases
Solution Approach 1:
The patent combines multiple color filter patterning steps into a single simultaneous patterning process. By forming red, green, and blue color filters in one step rather than sequentially, the manufacturing process is simplified and production efficiency is improved. This is achieved through a unified patterning approach that deposits and patterns all color filter materials together, eliminating the need for separate processing steps for each color.
2Manufacturing precision
If thick organic color filters are used to guarantee desired color quality, then color filtering performance is improved, but crosstalk increases due to obliquely incident light
Solution Approach 1:
The patent changes the physical and optical parameters of the color filters by using inorganic materials with high refractive indices (greater than 3.5) such as germanium, amorphous silicon, polycrystalline silicon, or crystalline silicon. This parameter change allows the color filters to be made thinner while maintaining effective color filtering, thereby reducing crosstalk from obliquely incident light. The high refractive index enables better light control and sharper optical edges, improving color purity without requiring thick filter layers.
3Object-affected harmful factors
If inorganic color filters with high refractive index are used, then crosstalk is reduced and color quality is improved, but manufacturing complexity may increase
Solution Approach 1:
The patent replaces complex multi-step sequential patterning mechanical processes with a simplified simultaneous patterning approach. Instead of performing separate deposition and patterning operations for each color layer, the invention uses a unified process that forms all color filters in one step. This substitution of the manufacturing methodology reduces process complexity despite using advanced inorganic materials, making the overall manufacturing more efficient and scalable.
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
This solution simplifies the manufacturing process, reduces crosstalk by minimizing interactions between Mie resonance particles, and enhances light transmission characteristics, improving the efficiency and accuracy of color filtering in image sensors and display devices.
Implementation Method 1
Each of the color filters includes at least one Mie resonance particle and a transparent dielectric surrounding the at least one Mie resonance particle
Data Source
AI summary
A color filter array may include a plurality of color filters arranged two-dimensionally and configured to allow light of different wavelengths to pass therethrough. Each of the plurality of color filters includes at least one Mie resonance particle and a transparent dielectric surrounding the at least one Mie resonance particle.