Quarter-Wave Plate Panel Layout for AR Ghost Image Reduction
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Solution Overview
Problem
Augmented reality electronic devices suffer from issues such as ghost images and decreased contrast ratio due to reflected light and internal components, which degrade display quality.
Innovation Solution
Incorporation of a light adjusting component with a panel and quarter wave plates having different retardation amounts to manage light transmission and reduce unwanted reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light adjusting component with quarter wave plates is added to reduce reflected light and ghost images, then display quality and contrast ratio are improved, but device complexity increases
Solution Approach 1:
The patent introduces quarter wave plates as intermediary optical elements between the light source and the display medium. These wave plates mediate the light path by converting linearly polarized light to circularly polarized light and back, thereby eliminating reflected light and ghost images that directly affect display quality without requiring complex mechanical or electronic control systems.
Solution Approach 2:
The patent changes the optical parameters of the light path by incorporating quarter wave plates with specific retardation amounts (first and second different retardation amounts). This parameter change in the optical path modifies the polarization state of light, enabling the system to suppress harmful reflections and improve contrast ratio without adding mechanical complexity.
2Manufacturing precision
If quarter wave plates with different retardation amounts are used on opposite sides of the panel, then contrast ratio and display quality are improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the light adjusting component into separate segments: a first quarter wave plate on one side of the panel and a second quarter wave plate on the opposite side, each with different retardation amounts. This segmentation allows for modular manufacturing and assembly, where each wave plate can be independently manufactured and then assembled into the complete optical system, reducing overall manufacturing complexity while achieving the desired display quality.
Solution Approach 2:
The patent employs asymmetric configuration by using quarter wave plates with different retardation amounts on opposite sides of the panel rather than identical components. This asymmetric design optimizes the optical path for minimizing reflections and improving contrast ratio, while the modular nature of the asymmetric components facilitates standardized manufacturing processes.
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
Enhances display quality by minimizing ghost images and improving contrast ratio through effective light management.
Implementation Method 1
The first quarter wave plate is disposed on a first side of the panel, wherein the first quarter wave plate has a first retardation amount. The second quarter wave plate is disposed on a second side of the panel opposite to the first side, wherein the second quarter wave plate has a second retardation amount.
Data Source
AI summary
An electronic device includes a light adjusting component. The light adjusting component includes a panel, a first quarter wave plate and a second quarter wave plate. The panel includes a first substrate, a second substrate and a medium layer disposed between the first substrate and the second substrate. The first quarter wave plate is disposed on a first side of the panel, wherein the first quarter wave plate has a first retardation amount. The second quarter wave plate is disposed on a second side of the panel opposite to the first side, wherein the second quarter wave plate has a second retardation amount. The first retardation amount is different from the second retardation amount.