Head-Mounted Display Lens Assembly with Heat-Stable Polymer
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Solution Overview
Problem
Head-mounted display devices face challenges with lens assemblies due to heat-induced dimensional instability and misalignment, which affect stereoscopic presentation and image distortion.
Innovation Solution
A lens assembly using a polymer matrix with high-performance thermoplastic polymers, exhibiting a deflection temperature under load of 50°C or more, providing high dimensional stability and heat resistance, along with properties like high melt viscosity and dielectric strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polymer materials are used in the lens assembly, then ease of manufacture is improved, but dimensional stability deteriorates due to heat-induced deformation
Solution Approach 1:
The patent changes the thermal parameter (deflection temperature under load) of the polymer material from conventional low values to at least 50°C, fundamentally altering the material's heat resistance properties to maintain dimensional stability while remaining manufacturable
Solution Approach 2:
The patent employs composite polymer materials combining thermoplastic polymers with specific additives and fillers to achieve both high deflection temperature (≥50°C) and manufacturability, creating a material that balances processing ease with thermal stability
2Temperature
If the lens assembly operates at elevated temperatures, then device functionality is maintained, but image quality deteriorates due to distortion from thermal expansion
Solution Approach 1:
The patent addresses thermal expansion effects by selecting polymer materials with controlled expansion characteristics and deflection temperatures of at least 50°C, ensuring the lens assembly maintains its dimensional precision and image quality even when operating temperatures rise
Solution Approach 2:
The patent changes the thermal resistance parameter of the lens assembly by using polymers with deflection temperatures ≥50°C, allowing the device to operate at elevated temperatures without the polymer deforming and distorting the visual image
3Measurement precision
If positioning components are made more precise, then alignment accuracy is improved, but sensitivity to position divergence worsens
Solution Approach 1:
The patent changes the thermal stability parameter of the polymer material (deflection temperature ≥50°C), which reduces thermal-induced position divergence and maintains alignment accuracy without increasing sensitivity to misalignment
Data Source
AI summary
A lens assembly (40) comprising a lens support structure (32) that is coupled to an optical display (14) and houses a lens (30) for viewing a visual image from the display (14) is provided. The lens assembly (40) contains a polymer matrix that contains a thermoplastic polymer, the polymer composition exhibits a deflection temperature under load of about 50° C. or more as determined in accordance with ISO 75:2013 at a load of 1.8 MPa.