Adjustable Polarization Eyewear with Rotatable Filters
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Solution Overview
Problem
Conventional eyewear with single-type polarizers cannot effectively filter out the diversity of polarized light due to environmental and manufacturer-specific factors, leading to suboptimal viewing conditions and image quality.
Innovation Solution
An adjustable polarization filter assembly in eyewear that includes rotatable achromatic polarization retarders, allowing for tuning of light polarization based on user and environmental inputs to block specific eigenpolarization states and transmit orthogonal states, enabling improved contrast and image quality across various conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-type polarizer is used in conventional eyewear, then the device complexity is reduced, but the ability to filter out diverse polarized light from different environmental sources is insufficient
Solution Approach 1:
The single polarizer is segmented into multiple independent rotatable polarization filters (at least two), each capable of being rotated to different angular positions. This segmentation allows each filter to target specific polarization directions, collectively covering a broader range of polarized light from different environmental sources while maintaining manageable device complexity through modular design.
Solution Approach 2:
The polarization filters are made dynamically adjustable through rotation mechanisms, allowing users to change the orientation of each filter independently. This dynamic capability enables the system to adapt to varying environmental polarization conditions (such as reflections from different surfaces at different angles) rather than being fixed to a single polarization direction, thereby improving versatility without significantly increasing complexity.
2Reliability
If conventional polarizers are used, then manufacturing simplicity is maintained, but the viewing contrast and reflection reduction performance are suboptimal in diverse environments
Solution Approach 1:
The filter assembly is segmented into multiple standardized rotatable polarization filter units, each with consistent manufacturing specifications. This segmentation allows for modular manufacturing where each unit can be produced independently using similar processes, then assembled together. The standardized interfaces and mounting mechanisms maintain ease of manufacture while the multi-filter configuration delivers consistent reliable performance across diverse viewing conditions.
Solution Approach 2:
The system enables parameter changes in the polarization filtering capability by allowing independent rotation of each filter to different angular positions. This parameter adjustability (orientation angle) allows the same physical filters to adapt to different environmental conditions, providing consistent reliable viewing performance whether the user is viewing reflections from water, glass, road surfaces, or other polarized light sources, without requiring different filters for each condition.
3Ease of operation
If fixed polarization filters are used, then the device operation is simple, but the ability to optimize for different environmental conditions and user preferences is limited
Solution Approach 1:
The fixed filters are replaced with dynamically rotatable polarization filters that can be adjusted to different angular positions. Each filter can be independently rotated, providing users with the capability to tune the polarization filtering to match specific environmental conditions (such as the angle of reflected light from different surfaces) or personal viewing preferences. The rotation mechanisms are designed to be user-friendly, maintaining ease of operation despite the added functionality.
Solution Approach 2:
The system adds a rotational dimension to the previously fixed linear filter configuration. By introducing angular adjustment capability, users can now optimize filtering performance by rotating filters to specific orientations that match the polarization direction of environmental reflections or light sources. This dimensional addition (rotation angle) significantly enhances tuning capability while the mechanical design keeps the operation intuitive and accessible.
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 solution provides enhanced viewing capabilities by allowing users to optimize polarization states for better contrast and reduced reflections in diverse environments, including indoor and outdoor settings, and compatibility with different polarized displays.
Implementation Method 1
a first rotatable polarization filter configured to rotate around an optical axis of the eyewear device, where the first rotatable polarization filter is configured to change a polarization of light that is incident thereupon
Implementation Method 2
the first and the second polarization filters together, via rotation of the first and the second rotatable polarization filters, is configurable to block any one of a plurality of eigenpolarization states on a Poincaré sphere and to transmit therethrough light having an orthogonal polarization state compared to the eigenpolarization state that is blocked
Data Source
AI summary
Devices, methods and systems related to an adjustable polarization filter assembly are described that can be implemented as part of an eyewear or another viewing device to provide the ability to tune the polarization of light that is received based on user and environmental inputs. One example device includes a first rotatable polarization filter that is configured to change a polarization of the incident light, and a second rotatable polarization filter that is also configured to rotate and modify a polarization of light that is incident thereon. The two filters together, via rotation of the first and the second filters, can block any eigenpolarization state on a Poincaré sphere and transmit an orthogonal polarization state. The described devices provide improved viewing capability in different environmental conditions, such as under water, in haze or fog, in outdoor and indoor environments, and in day and night times.