Lens Assembly with Anisotropic Phase Retardation for Ghost Image Reduction
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Solution Overview
Problem
Current head-mounted display technologies face challenges in improving display quality, particularly in reducing ghost images and enhancing the realism of virtual and augmented reality experiences.
Innovation Solution
A lens assembly is designed with a specific configuration that includes a first polarization layer, a phase retardation layer, a second polarization layer, a quarter wave plate, a partially reflective mirror layer, another quarter wave plate, and a third polarization layer. This configuration effectively manages light polarization and phase retardation to minimize ghost images and improve display clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a lens assembly is designed to reduce ghost images and improve display quality, then display quality and realism are improved, but the structure becomes more complex with multiple polarization layers and phase retardation layers
Solution Approach 1:
The lens assembly is divided into multiple functional layers including first and second polarization layers, phase retardation layers with specific refractive indices, quarter wave plates, and a partially reflective mirror layer. Each layer performs a specific optical function to collectively reduce ghost images and improve display quality without requiring a complete redesign of the entire system.
Solution Approach 2:
The phase retardation layer is designed with anisotropic refractive indices where the first and second phase retardation refractive indices differ from the third phase retardation refractive index. This local variation in optical properties allows selective manipulation of light polarization states for different directions, effectively reducing ghost images while maintaining overall system functionality.
2Manufacturing precision
If multiple polarization layers and phase retardation layers are added to reduce ghost images, then ghost image reduction is achieved, but light loss increases and luminance decreases
Solution Approach 1:
The phase retardation layer is designed with specific refractive index parameters where the first and second phase retardation refractive indices are different from the third phase retardation refractive index. By optimizing these refractive index parameters, the system achieves effective ghost image reduction while minimizing light loss through constructive interference and reduced absorption.
Solution Approach 2:
The lens assembly combines multiple materials with different optical properties including polarization layers, phase retardation layers with anisotropic refractive indices, quarter wave plates, and partially reflective mirror layers. This composite structure allows each material to contribute its specific optical function while collectively minimizing light loss through optimized light path management.
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 proposed lens assembly significantly enhances display quality by reducing ghost images and improving the overall realism of virtual and augmented reality experiences, while also minimizing light loss and maintaining adequate luminance.
Implementation Method 1
the phase retardation layer has a first phase retardation refractive index along a first direction, has a second phase retardation refractive index equal to the first phase retardation refractive index along a second direction, and has a third phase retardation refractive index along a third direction perpendicular to the first direction and the second direction
Implementation Method 2
the phase retardation layer has a first phase retardation refractive index along a first direction, has a second phase retardation refractive index equal to the first phase retardation refractive index along a second direction, and has a third phase retardation refractive index along a third direction perpendicular to the first direction and the second direction
Implementation Method 3
a first polarization layer disposed adjacent to the incident side; a second polarization layer disposed between the first polarization layer and the exit side; a third polarization layer disposed adjacent to the exit side
Implementation Method 4
a first polarization layer disposed adjacent to the incident side; a second polarization layer disposed between the first polarization layer and the exit side; a third polarization layer disposed adjacent to the exit side
Implementation Method 5
a first quarter wave plate disposed between the second polarization layer and the exit side; a second quarter wave plate disposed between the partially reflective mirror layer and the exit side
Implementation Method 6
a partially reflective mirror layer disposed between the first quarter wave plate and the exit side
Data Source
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AI summary
A lens assembly including an incident side on which light is incident and an exit side opposite to the incident side, includes: a first polarization layer disposed adjacent to the incident side; a second polarization layer disposed between the first polarization layer and the exit side; a phase retardation layer disposed between the first polarization layer and the second polarization layer. The phase retardation layer has a first phase retardation refractive index along a first direction, has a second phase retardation refractive index equal to the first phase retardation refractive index along a second direction, and has a third phase retardation refractive index along a third direction perpendicular to the first direction and the second direction, and the first phase retardation refractive index and the second phase retardation refractive index are different from the third phase retardation refractive index.