Patterned Polarization Grating Converter for Non-Polarized Light
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Solution Overview
Problem
Conventional polarization converters have low conversion efficiency when dealing with non-polarized light, as their efficiency significantly decreases and they struggle to convert input light of any polarization state to a specified output polarization state effectively.
Innovation Solution
A patterned polarization grating polarization converter (PPG-PC) assembly is used, comprising a patterned polarization grating with multiple domains that diffract incident light into specific diffraction orders and a patterned retarder, which together convert input light of any polarization state to output light with high efficiency, achieving near 100% conversion efficiency and wide acceptance angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional polarization converters are used, then the device structure is simple, but the conversion efficiency is low when dealing with non-polarized light
Solution Approach 1:
The polarization converter is divided into multiple domains with different grating vectors. Each domain handles specific polarization conversion tasks, allowing the system to achieve high conversion efficiency for non-polarized light while maintaining a manageable structural complexity through modular domain design.
Solution Approach 2:
Different regions (domains) of the polarization converter are assigned different grating vectors and polarization conversion characteristics. This local differentiation enables optimized performance for various input polarization states, particularly improving conversion efficiency for non-polarized light without requiring complete structural redesign.
2Productivity
If conventional polarization converters are used, then the manufacturing process is simple, but the conversion efficiency significantly decreases for non-polarized light
Solution Approach 1:
The manufacturing process is segmented into domain-specific fabrication steps, where each domain can be optimized independently. This allows the complex multi-domain structure to be manufactured using standardized processes repeated across different regions, maintaining ease of manufacture while achieving high conversion efficiency.
Solution Approach 2:
The grating vector parameters are varied across different domains to optimize performance for non-polarized light conversion. By adjusting parameters such as grating period, orientation, and depth locally, the system achieves high conversion efficiency without requiring fundamentally new manufacturing techniques.
3Adaptability or versatility
If conventional polarization converters are used, then the device is simple in design, but it struggles to convert input light of any polarization state to specified output polarization state
Solution Approach 1:
The multi-domain polarization converter is designed to handle multiple input polarization states (linear, circular, elliptical) and convert them to specified output polarization states. Each domain contributes to the universal capability, allowing the single device to perform multiple conversion functions that would otherwise require separate converters.
Solution Approach 2:
The polarization converter utilizes dynamic interference patterns created by multiple grating vectors to adaptively handle different input polarization states. The superposition of diffraction orders from different domains creates a dynamic response that can convert various input states to the desired output state, enhancing versatility without proportionally increasing structural complexity.
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 high optical efficiency and significant power consumption reduction in LCOS and LCD devices, particularly beneficial for mobile devices by efficiently converting non-polarized light to polarized light, enhancing battery life and display performance.
Implementation Method 1
each domain of the PPG is configured to diffract incident light into first and second types of light beams corresponding to a first diffraction order
Implementation Method 2
a patterned retarder (PR), having a plurality of domains, the plurality of domains of the PR including domains corresponding to areas where the first type of light beams output from the PPG and including domains corresponding to areas where the second type of light beams output from the PPG converge
Data Source
AI summary
A liquid crystal display (LCD) backlight system includes: a light source, configured to generate light; a patterned polarization grating polarization converter (PPG-PC) assembly, configured to convert the generated light from a first polarization state to a second polarization state. The PPG-PC further includes: a patterned polarization grating (PPG) having a plurality of domains, wherein the plurality of domains of the PPG include at least two different types of domains, and wherein each domain of the PPG is configured to diffract incident light into first and second types of light beams corresponding to a first diffraction order; and a patterned retarder (PR), having a plurality of domains, the plurality of domains of the PR including domains corresponding to areas where the first type of light beams output from the PPG and including domains corresponding to areas where the second type of light beams output from the PPG converge.