XR Glasses Projector Shielding Arm for RF Noise Isolation
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Solution Overview
Problem
Optical see-through XR displays face challenges in presenting realistic-looking virtual content while maintaining an unobstructed view of the physical environment, and RF noise from components like LEDs and LCOS displays interferes with wireless communication, requiring effective RF shielding and mechanical stability.
Innovation Solution
A grounded enclosure around the projector is formed using metal components to shield RF noise, with a support arm providing structural support and RF shielding, while minimizing mechanical loading to prevent image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a grounded enclosure is formed using metal components around the projector, then RF noise shielding is improved, but mechanical loading on the projector increases causing image distortion
Solution Approach 1:
The support arm assembly is divided into multiple segments: a first support arm portion that provides RF shielding without mechanical loading, and a second support arm portion that provides structural support. This segmentation allows the RF shielding function to be separated from the mechanical support function, preventing image distortion while maintaining RF noise protection.
Solution Approach 2:
A compliant connector is introduced as an intermediary element between the metal support arm and the projector. This compliant connector acts as a mediator that blocks RF noise transmission paths while accommodating thermal expansion and contraction, preventing both RF interference and mechanical stress transmission to the projector.
2Object-affected harmful factors
If metal components are used for RF shielding, then RF noise protection is improved, but thermal expansion and contraction increases affecting structural stability
Solution Approach 1:
The support arm assembly utilizes parameter changes in the form of compliant connectors that can flex and deform elastically. This allows the rigid metal support arm to accommodate thermal expansion and contraction by transferring dimensional changes to the compliant connector, maintaining structural stability while preserving RF shielding effectiveness.
3Device complexity
If the support arm provides both structural support and RF shielding, then device complexity is reduced, but mechanical loading on the projector increases
Solution Approach 1:
The support arm is segmented into functional portions: a first portion dedicated to RF shielding that does not mechanically load the projector, and a second portion dedicated to structural support. This segmentation allows each portion to be optimized for its specific function while maintaining overall device simplicity.
Solution Approach 2:
The RF shielding function is extracted from the mechanical support function. The first support arm portion provides RF shielding without bearing mechanical load, while the second support arm portion provides structural support. This extraction prevents mechanical stress from being transmitted to the projector through the RF shielding components.
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 effectively shields RF noise and maintains mechanical stability, ensuring clear virtual content overlay on the physical environment without distortion, enhancing the user experience.
Implementation Method 1
a support arm assembly for a head-worn device defining an electrically grounded enclosure for a projector configured to provide radio frequency (RF) shielding for the projector
Data Source
AI summary
A support arm assembly for a head-worn device provides radio frequency (RF) shielding for a projector. A metal support arm, configured to structurally attach to a rear structural element and an optical element holder of the head-worn device, forms a rear face, a bottom face, and a top face of an enclosure. A metal front face of the enclosure attaches to the optical element holder, and defines a front aperture for permitting passage of light from an exit pupil of the projector toward an input optical element. The metal support arm forms a structural support joining the optical element holder to the rear structural element without placing mechanical load on the projector. A first side face of the enclosure and a second side face of the enclosure are electrically coupled to the metal support arm.