Polarized Micro-Lens Array for Higher-Contrast 3D Imaging
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Solution Overview
Problem
Existing micro-lens arrays for obtaining plenoptic images lack a polarizer, resulting in unpolarized images that fail to capture characteristic information about objects, such as surface roughness and geometrical structure, leading to reduced image resolution and contrast.
Innovation Solution
A micro-lens array is developed that includes a transparent substrate with a plurality of polarizers disposed on it, a passivation layer covering the polarizers, and micro-lenses on the passivation layer. The polarizers are oriented in different directions to polarize light reflected from an object, which is then incident on the micro-lenses, enhancing image resolution and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a polarizer is added to the micro-lens array, then image resolution and contrast are improved, but device complexity increases
Solution Approach 1:
The patent combines the polarizer and micro-lens array into a single integrated structure, where the polarizer is formed directly on the substrate and the micro-lenses are formed on top of the polarizer. This merging eliminates the need for separate components and reduces overall device complexity while maintaining the polarization function that improves image resolution and contrast.
Solution Approach 2:
The substrate serves multiple functions: it acts as the base structure for the device, supports the polarizer formation, and provides the foundation for micro-lens fabrication. This multi-functionality reduces the need for additional supporting structures, thereby improving measurement precision without proportionally increasing device complexity.
2Loss of information
If a polarizer is added to the micro-lens array, then polarization information is captured, but manufacturing complexity increases
Solution Approach 1:
The polarizer is formed first on the substrate before the micro-lenses are fabricated. This preliminary action allows the polarization function to be established early in the manufacturing process, and subsequent lens formation steps can proceed without disrupting the polarizer structure, thereby capturing polarization information while managing manufacturing complexity through sequential processing.
Solution Approach 2:
The patent replaces complex mechanical polarization filters with a thin-film polarizer structure that can be deposited using standard semiconductor fabrication techniques. This substitution simplifies the manufacturing process by using established thin-film deposition methods rather than requiring assembly of complex mechanical polarization components.
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 integration of polarizers in the micro-lens array enables the capture of polarization images with improved resolution and contrast, allowing for the detection of object surface characteristics that were previously undetectable, thereby enhancing the quality of 3D plenoptic images.
Implementation Method 1
light reflected to an object passes through the transparent substrate, and then, is polarized based on a plurality of different polarization orientations formed by the plurality of polarizers
Implementation Method 2
a plurality of micro-lenses disposed on the passivation layer, wherein light reflected to an object passes through the transparent substrate, and then, is polarized based on a plurality of different polarization orientations formed by the plurality of polarizers and is incident on the plurality of micro-lenses
Data Source
AI summary
A micro-lens array is provided. The micro-lens array includes a transparent substrate, a plurality of polarizers disposed on the transparent substrate, a passivation layer covering the plurality of polarizers, and a plurality of micro-lenses disposed on the passivation layer, wherein light reflected to an object passes through the transparent substrate, and then, is polarized based on a plurality of different polarization orientations formed by the plurality of polarizers and is incident on the plurality of micro-lenses.