Polarization-Agnostic Optical Dimming for Near-Eye Displays
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Solution Overview
Problem
Conventional optical dimmers for near-eye displays are polarization-dependent, leading to unsatisfactory dimming effects for ambient lights with different polarizations, requiring users to adjust the orientation of polarizers or remove the display to view images from ambient electronic screens, increasing operation complexity and degrading user experience.
Innovation Solution
A polarization-agnostic optical dimming device that includes a polarization rotator to switch the polarization of incoming light between two orthogonal polarizations at a high frequency, coupled with a polarizer to maintain a consistent dimming effect across different initial polarizations, ensuring a predetermined percentage of light intensity reduction regardless of the incoming light's polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional polarization-dependent optical dimmer is used, then the device can control light intensity for specific polarization directions, but the dimming effect varies for ambient lights with different polarizations, requiring user adjustment
Solution Approach 1:
The patent employs a dynamic polarization rotator that continuously switches the polarization state of incoming light between two orthogonal polarizations at a high frequency. This dynamic switching ensures that regardless of the initial polarization direction of ambient light, the light intensity is consistently reduced to a predetermined percentage, eliminating the need for user adjustment while maintaining uniform dimming across all polarization angles
Solution Approach 2:
The invention changes the polarization parameter of the incoming light by introducing a polarization rotator that rotates the polarization angle between 0° and 90° at high frequency. This parameter transformation enables the subsequent polarizer to achieve consistent dimming performance for any initial polarization state, as the rotating polarization ensures all angles are treated equally over time
2Adaptability or versatility
If a polarization rotator switches polarization at high frequency, then uniform dimming is achieved for all polarizations, but the device complexity increases
Solution Approach 1:
The patent divides the optical path into distinct functional segments: a polarization rotator module that handles polarization switching, and a polarizer module that performs the dimming function. This segmentation allows each component to be optimized independently while working together to achieve polarization-independent dimming, managing device complexity through modular design
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 polarization-agnostic optical dimming device provides a uniform dimming effect for various ambient light sources, simplifying the operation of near-eye displays and enhancing user experience by maintaining consistent image visibility across different polarizations, while allowing seamless switching between see-through and immersive modes.
Implementation Method 1
at least one polarization rotator configured to switch a polarization of a linearly polarized component of an incoming light between two orthogonal polarizations
Implementation Method 2
at least one polarizer coupled with the at least one polarization rotator, and configured to output a light having a light intensity reduced to a predetermined percentage of an initial light intensity of the incoming light
Data Source
AI summary
A device includes a polarization rotator configured to be switchable between operating in two switching states. The device also includes a controller configured to control the polarization rotator to switch between operating in the two switching states at a predetermined switching frequency, to thereby switch, a polarization of a component of an input light having an initial light intensity, between two orthogonal polarizations at the predetermined switching frequency. The device also includes a polarizer coupled with the polarization rotator, and configured to convert the input light transmitted through the polarization rotator into an output light having a light intensity reduced to a predetermined percentage of the initial light intensity of the input light.