Rotating Compensation Element for LCoS Polarization Alignment
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Solution Overview
Problem
Conventional projection devices with liquid crystal on silicon (LCoS) face challenges in achieving consistent polarization direction, leading to insufficient brightness and contrast, and the existing compensation plates have limited adjustable polarization angles, causing installation deviations and inefficiencies.
Innovation Solution
An imaging system and projection device design that includes a compensation module with a carrier element and compensation element, where the carrier element can rotate around a axis, allowing for adjustable polarization angles without disassembling the housing, enhancing adjustment convenience and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a compensation plate is adopted to adjust the polarization angle, then the brightness and contrast are improved, but the adjustment range is limited and installation deviation occurs
Solution Approach 1:
The patent transforms the static compensation plate into a dynamic adjustable system by enabling rotation of the compensation element around an optical axis. This allows the polarization angle to be dynamically adjusted to different positions, resolving the limitation of fixed adjustment ranges while maintaining improved brightness and contrast performance.
Solution Approach 2:
The patent separates the compensation element from the housing structure, allowing it to be independently adjusted and positioned. This segmentation enables precise angular adjustment without affecting the overall housing assembly, eliminating installation deviation while preserving the brightness and contrast improvements.
2Illumination intensity
If a compensation plate is adopted to adjust the polarization angle, then the brightness and contrast are improved, but installation deviation occurs due to screw fastening
Solution Approach 1:
The patent replaces the screw fastening mechanical system with a rotation-based positioning system. The compensation element rotates around the optical axis and can be fixed at precise angular positions without requiring screws, thereby eliminating installation deviation while maintaining the brightness and contrast improvements achieved through proper polarization alignment.
3Adaptability or versatility
If the compensation plate angle exceeds 45 degrees, then polarization adjustment is needed, but component replacement is required
Solution Approach 1:
The patent implements a dynamic rotation mechanism that allows the compensation element to be adjusted to any angle around the optical axis, including angles exceeding 45 degrees. This eliminates the need for component replacement while maintaining full polarization adjustment capability, thereby reducing device complexity while preserving adaptability.
4Ease of operation
If the carrier element rotates around an axis, then adjustment convenience is improved, but structural complexity increases
Solution Approach 1:
The patent designs the rotation axis and carrier element structure to serve multiple functions: it enables angular adjustment of the compensation element, maintains precise positioning during rotation, and allows for easy fixation at desired angles. This multi-functionality achieves adjustment convenience while minimizing the increase in structural complexity through efficient 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
Enables precise adjustment of the compensation element's angle, reducing errors and improving brightness, contrast, and image quality by allowing for flexible polarization adjustments within the projection device.
Implementation Method 1
the polarization direction of the light reflected by the liquid crystal on silicon cannot be consistent at all. Therefore, the brightness and the contrast may be insufficient. Currently, a compensation plate is adopted to adjust the inconsistency of the polarized light
Data Source
AI summary
An imaging system including a housing, a light-splitting element, a light valve module, and a compensation module is provided. The light valve module is disposed on a transmission path of an illumination beam and is configured to convert the illumination beam into an image beam. The light-splitting element is disposed on the transmission path of the illumination beam and is configured to reflect the illumination beam and allow the image beam to pass through. The compensation module is disposed between the light valve module and the light-splitting element. The compensation module includes a carrier element and a compensation element. The carrier element includes a slot. The carrier element is configured to rotate around a rotation axis. The compensation element is disposed in the slot and is located on the transmission path of the illumination beam and a transmission path of the image beam.