Optical Module Pressure-Relieving Features for HMD
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Solution Overview
Problem
Head-mounted display systems face challenges in maintaining a dynamic screen-to-lens distance to simulate changing focal distances between foreground and background features, leading to pressure changes within the chamber that can resist motion and potentially deform the display components.
Innovation Solution
Incorporating an optical module with a lens, display screen, movement mechanism, and pressure-relieving features such as vents, adsorbent materials, or passive radiators that are in fluid communication with the chamber to hinder pressure changes, allowing for a lighter and more compact display unit with reduced loading on the movement mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens and display screen are moved relative to each other to simulate changing focal distances, then the viewing experience is improved, but pressure changes in the chamber resist motion and may deform display components
Solution Approach 1:
The patent extracts the pressure management function from the sealed chamber by introducing pressure-relieving features (vents, adsorbent materials, or passive radiators) that are in fluid communication with the chamber. This allows pressure to be regulated independently from the motion of the lens and display screen, reducing motion resistance and preventing deformation.
Solution Approach 2:
The patent introduces intermediary components (pressure-relieving features) between the chamber environment and the moving optical components. These intermediaries absorb or regulate pressure changes, mediating the interaction between the sealed chamber and the external atmosphere, thereby reducing the force required to move the lens and display screen.
2Adaptability or versatility
If the lens and display screen are moved relative to each other to simulate changing focal distances, then the viewing experience is improved, but the display components may deform due to pressure changes
Solution Approach 1:
The patent implements beforehand cushioning by incorporating pressure-relieving features that proactively manage pressure changes before they can cause deformation. The adsorbent materials or passive radiators are positioned to absorb excess pressure or allow pressure equalization, cushioning the display components against pressure-induced deformation during motion.
3Force
If pressure changes are allowed in the chamber during lens and display movement, then the movement mechanism requires more force, but sealing the chamber prevents pressure changes and resists motion
Solution Approach 1:
The patent extracts the pressure regulation function from the sealing system by adding dedicated pressure-relieving features. This allows the chamber to remain sealed for reliability while simultaneously providing pressure management to reduce motion force requirements.
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 a more natural and realistic viewing experience by dynamically adjusting the screen-to-lens distance while reducing the force requirements of the movement mechanism, thereby minimizing deformation and enhancing the overall performance of the head-mounted display.
Implementation Method 1
The one or more pressure-relieving features may include an adsorbent. The passive pressure-relieving feature may adsorb air as the chamber decreases in size, and may be zeolite.
Implementation Method 2
The passive pressure-relieving feature may expand as the chamber decreases in size, and may be a passive radiator.
Data Source
AI summary
An optical module for a display system includes a lens, a display screen, a movement mechanism, and one or more pressure-relieving features. The display screen cooperatively defines a chamber with the lens. The lens and the display screen are moved relative to each other by the movement mechanism. The one or more pressure-relieving features are in fluid communication with the chamber to hinder pressure in the chamber as the lens and the display are moved relative to each other.