Polarizing Beam Splitter Plates High Resolution Imaging
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Solution Overview
Problem
Existing polarizing beam splitters, particularly those using multilayer optical films, struggle to achieve high effective resolution for imaged light reflected towards a viewer or screen, especially in applications like three-dimensional projection and imaging.
Innovation Solution
The use of a polarizing beam splitter system that incorporates a multilayer optical film reflective polarizer with a surface roughness of less than 45 nm or 80 nm, and is designed to reflect imaged light with an effective pixel resolution of less than 12 microns, potentially down to 6 microns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer optical film reflective polarizer is used in a polarizing beam splitter, then the polarization separation function is improved, but the effective resolution of reflected imaged light deteriorates due to surface roughness and distortion
Solution Approach 1:
The patent applies parameter changes by specifying precise surface roughness parameters (Ra < 45 nm, Rq < 80 nm) for the multilayer optical film reflective polarizer. By controlling and optimizing the surface roughness parameters within specific ranges, the patent resolves the contradiction between maintaining polarization separation function and achieving high effective resolution of reflected imaged light.
Solution Approach 2:
The patent applies local quality by differentiating the surface quality requirements for different regions and functions of the polarizing beam splitter. The reflective polarizer surface requires extremely low roughness for high-resolution reflection, while other components may have different specifications. This localized quality control allows the system to maintain both polarization function and image resolution.
2Manufacturing precision
If the surface roughness of the reflective polarizer is reduced to improve resolution, then the effective pixel resolution is improved, but the manufacturing complexity and difficulty increase
Solution Approach 1:
The patent applies preliminary action by specifying surface roughness requirements (Ra < 45 nm, Rq < 80 nm) that must be achieved during the manufacturing process of the multilayer optical film reflective polarizer. By establishing these precise specifications in advance, the manufacturing process is guided to produce surfaces with the required quality, balancing resolution improvement with manufacturing feasibility.
Solution Approach 2:
The patent introduces surface roughness parameters (Ra and Rq) as intermediary metrics that mediate between the manufacturing process and the final image resolution quality. These intermediary parameters provide a measurable and controllable target for manufacturers, translating the abstract goal of 'high resolution' into concrete manufacturing specifications that can be achieved with appropriate processes.
3Manufacturing precision
If the polarizing beam splitter is designed for high resolution reflection, then the image quality is improved, but the device complexity increases to achieve the required surface flatness and roughness control
Solution Approach 1:
The patent applies parameter changes by defining specific surface roughness parameters (Ra < 45 nm, Rq < 80 nm) and surface flatness requirements for the multilayer optical film reflective polarizer. By establishing these quantitative parameters, the patent transforms the complex qualitative goal of 'high image quality' into measurable and controllable specifications, thereby managing device complexity through parameter standardization.
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
This solution enables the polarizing beam splitter to reflect imaged light with significantly improved effective resolution, addressing the distortion issues and meeting the high resolution demands of advanced imaging applications.
Implementation Method 1
The polarizing beam splitter separates the incoming illumination light from the polarization-rotated light from the imager
Implementation Method 2
The reflective polarizer reflects imaged light towards a viewer or screen with an effective pixel resolution of less than 12 microns
Data Source
AI summary
Polarizing beam splitter plates and systems incorporating such beam splitter plates are described. The polarizing beam splitter plate includes a first substrate and a multilayer optical film reflective polarizer that is disposed on the first substrate. The polarizing beam splitter plate includes a first outermost major surface and an opposing second outermost major surface that makes an angle of less than about 20 degrees with the first outermost major surface. The polarizing beam splitter plate is adapted to reflect an imaged light received from an imager towards a viewer or screen with the reflected imaged light having an effective pixel resolution of less than 12 microns.