PBP Color Corrected Structure for Chromatic Aberration
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Solution Overview
Problem
Pancharatnam Berry Phase (PBP) liquid crystal components in optical assemblies for VR, AR, and MR systems suffer from strong wavelength dependence, leading to chromatic aberration and reduced image quality due to varying beam steering angles and focal lengths for different color channels.
Innovation Solution
A PBP color corrected structure comprising switchable gratings and active elements that adjust light of different color channels by the same amount to output light corrected for chromatic aberration, using electrically switchable Bragg gratings and PBP liquid crystal components to diffract or focus light to a common angle or focus for multiple wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PBP liquid crystal components are used in optical assemblies, then the optical assembly can achieve beam steering and focusing functions, but chromatic aberration occurs due to strong wavelength dependence
Solution Approach 1:
The optical assembly is divided into multiple wavelength-specific optical paths, with each path containing optical elements optimized for a specific wavelength range. This segmentation allows each segment to handle its designated wavelength without chromatic interference, while collectively providing full-spectrum functionality.
Solution Approach 2:
Dichroic mirrors are introduced as intermediary elements to separate and redirect different wavelength components of light into respective optimized optical paths. These mediators enable wavelength-specific beam steering and focusing while eliminating chromatic aberration by ensuring each wavelength travels through its dedicated optical channel.
2Ease of operation
If PBP liquid crystal gratings are used for beam steering, then light can be diffracted at specific angles, but the beam steering angle varies with wavelength causing chromatic separation
Solution Approach 1:
The beam steering function is segmented into wavelength-specific channels, with each channel containing PBP liquid crystal gratings optimized for a particular wavelength range. This ensures that each segment maintains consistent beam steering angles for its designated wavelengths without chromatic variation.
Solution Approach 2:
Dichroic mirrors serve as intermediaries that direct each wavelength component to its corresponding wavelength-optimized grating. This mediation ensures that beam steering is performed at consistent angles for each wavelength group, preventing chromatic separation while maintaining overall beam steering functionality.
3Adaptability or versatility
If PBP liquid crystal lenses are used for focusing, then light can be focused at specific distances, but the focal length varies with wavelength causing chromatic aberration
Solution Approach 1:
The focusing function is divided into wavelength-specific optical paths, with each path containing PBP liquid crystal lenses optimized for a specific wavelength range. This segmentation ensures that each lens maintains consistent focal length for its designated wavelengths, eliminating chromatic aberration while preserving overall focusing capability.
Solution Approach 2:
Dichroic mirrors act as intermediaries that separate wavelengths and direct them to corresponding wavelength-optimized lenses. This mediation ensures that each wavelength group is focused at a consistent distance by its dedicated lens, preventing chromatic aberration while maintaining the system's focusing function.
4Adaptability or versatility
If multiple color channels are transmitted through PBP components, then the system can process multi-wavelength light, but chromatic aberration reduces image quality
Solution Approach 1:
The multi-wavelength light processing is segmented into separate wavelength-specific optical paths, with each path optimized for a particular color channel. This segmentation allows each channel to be processed with wavelength-optimized components, maintaining high image quality across all channels while preserving multi-wavelength capability.
Solution Approach 2:
Dichroic mirrors serve as intermediaries that separate multi-wavelength light into individual wavelength channels and direct them to corresponding optimized optical paths. This mediation enables the system to process multiple color channels simultaneously with high fidelity, eliminating chromatic aberration while maintaining adaptability to multi-wavelength input.
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 effectively corrects chromatic aberration across multiple color channels, enhancing image quality by ensuring consistent beam steering or focusing, thereby improving the performance of optical assemblies in head-mounted displays.
Implementation Method 1
Pancharatnam Berry Phase (PBP) liquid crystal components can be used as an integral part of an optical assembly
Implementation Method 2
a PBP liquid crystal grating diffracts light by an angle that depends on a wavelength of the light coming into the PBP liquid crystal grating
Implementation Method 3
a PBP liquid crystal lens focuses light to a focus that depends on a wavelength of the light coming into the PBP liquid crystal lens
Implementation Method 4
Each PBP active element is configured to adjust light of a different color channel of the set of color channels by a same amount to output light corrected for chromatic aberration
Data Source
AI summary
A Pancharatnam Berry Phase (PBP) color corrected structure is presented that comprises a plurality of switchable gratings and a plurality of PBP active elements. Each switchable grating has an inactive mode when reflects light of a specific color channel, of a set of color channels, and transmits light of other color channels in the set of color channels, wherein the specific color channel is different for each of the plurality of switchable gratings, and to have an active mode to transmit light that is inclusive of the set of color channels. The PBP active elements receive light output from at least one of the plurality of switchable gratings. Each of the PBP active elements is configured to adjust light of a different color channel of the set of color channels by a same amount to output light corrected for chromatic aberration for the set of color channels.