Stacked Polarizer Imaging Sensor Footprint Reduction
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Solution Overview
Problem
Current imaging systems face challenges in capturing images with different polarizations without increasing the footprint of image sensors, as they require multiple polarizers that are not efficiently managed to achieve high image quality.
Innovation Solution
A stacked polarizer system where multiple polarizers are stacked and individually activated/deactivated to capture images with various polarizations, allowing each image sensor cell to capture images with different polarizations without increasing the sensor's footprint, using a controller to determine image quality and store or discard data accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple polarizers are stacked to capture images with different polarizations, then the ability to capture polarized images is improved, but the device complexity increases
Solution Approach 1:
The patent divides the imaging function into multiple polarization channels by stacking several polarizers with different orientation angles (e.g., 0°, 45°, 90°, 135°) in front of corresponding pixel groups. Each polarizer segment captures light with a specific polarization state, and the controller segments the captured data to reconstruct polarized images. This segmentation allows the system to capture multiple polarization states simultaneously without requiring mechanical moving parts.
Solution Approach 2:
The patent adds a polarization dimension to the traditional imaging system by stacking polarizers at different orientation angles. Instead of using a single polarizer that would block most light, the system utilizes the angular dimension of polarization by arranging multiple polarizers at different orientations (0°, 45°, 90°, 135°) to capture the full polarization spectrum. This dimensional approach transforms a single-dimensional light capture into a multi-dimensional polarization-sensitive imaging system.
2Measurement precision
If multiple polarizers are used to capture different polarizations, then image quality is improved, but the footprint of the image sensor increases
Solution Approach 1:
The patent merges multiple polarization capture functions into a single compact sensor array by stacking thin-film polarizers directly over the pixel array. Instead of using separate sensors for different polarizations, the system combines multiple polarizer layers at different orientations (0°, 45°, 90°, 135°) in a stacked configuration, where each layer captures a specific polarization component. This merging allows all polarization information to be captured simultaneously within the same physical footprint, eliminating the need for multiple separate sensor arrays.
Solution Approach 2:
The patent implements a nested structure by stacking multiple thin-film polarizer layers directly on top of each other and over the pixel array. Each polarizer layer is nested within the vertical stack, with orientations at 0°, 45°, 90°, and 135° respectively. This nested arrangement allows multiple polarization functions to be integrated in the vertical dimension rather than spreading them out horizontally, maintaining a compact sensor footprint while capturing comprehensive polarization data through the stacked layers.
3Adaptability or versatility
If polarizers are activated individually to capture different polarizations, then versatility is improved, but the use of energy increases
Solution Approach 1:
The patent achieves continuous polarization capture by having all polarizer layers simultaneously active rather than sequentially switching them on and off. The stacked polarizers at different orientations (0°, 45°, 90°, 135°) all transmit their respective polarization components continuously, allowing the sensor to capture the full polarization spectrum at all times. This continuous action eliminates the energy consumption associated with activating and deactivating individual polarizers sequentially, while still providing versatile polarization imaging capability.
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
Enables efficient capture of images with different polarizations without increasing the image sensor's footprint, ensuring high image quality by selectively activating/deactivating polarizers and interpolating data from nearby pixels when necessary.
Implementation Method 1
A stacked polarizer can include a plurality of polarizers that are stacked upon each other such that a light source input can be pass through the stack of polarizers and be detected by a pixel of an image sensor cell. Each polarizer in the stack can individually activate and deactivate to polarize light for image capture.
Data Source
AI summary
Embodiments of the present disclosure include apparatuses and method for stacked polarizer imaging. In a number of embodiments, a method can include activating a first polarization layer of a plurality of polarization layers, detecting a first image with an array of pixels from a light source input that is polarized when passed through the first polarization layer, and determining, via a controller coupled to the array of pixels, whether a quality of the first image that was polarized by the first polarization layer meets a threshold. A stacked polarizer can include a plurality of polarizers that are stacked upon each other such that a light source input can be passed through the stack of polarizers and be detected by a pixel of an image sensor cell. Each of the polarizers in the stack of polarizers can be individually activated and deactivated.