Light-Guiding Device Adhesive Layer for Optical Surface Protection
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Solution Overview
Problem
Existing light-guiding devices for head-mounted displays face issues with the protective substrate peeling due to heat and humidity, leading to instability and potential damage to the optical surfaces.
Innovation Solution
A light-guiding device with a sheet-shaped protective member and an adhesive layer between the body member and the protective member, which covers the optical surfaces and provides cushioning to prevent peeling and maintain optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a protective substrate is disposed opposite a total reflection surface of a light-guiding plate to form an air layer, then the optical surface is protected, but the protective substrate may be peeled from the light-guiding plate due to heat and humidity
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the protective substrate and the light-guiding plate. This adhesive layer serves as a mediator that bonds the two components together, preventing peeling while maintaining the air layer structure for optical protection. The adhesive layer specifically addresses the reliability issue caused by heat and humidity exposure.
Solution Approach 2:
The structure combines multiple materials with different properties: the protective substrate (for protection), the adhesive layer (for bonding and flexibility), and the light-guiding plate (for optical function). This composite structure leverages the strengths of each material to achieve both protection and peeling resistance simultaneously.
2Object-affected harmful factors
If a protective substrate is disposed opposite a total reflection surface, then the optical surface is protected, but the structure becomes more complex
Solution Approach 1:
The protective substrate is implemented as a thin film or sheet that can be easily applied to the light-guiding plate. This thin-film approach provides protection while minimizing the addition of structural complexity, as thin films can be integrated into existing structures with minimal modification.
3Stability of the object's composition
If the protective substrate is supported by a support member, then the protective substrate is stabilized, but the specific structure and implementation are not well-defined
Solution Approach 1:
The adhesive layer serves as a well-defined intermediary that provides both support and stabilization to the protective substrate. This approach clarifies the manufacturing process by specifying a standard adhesive bonding method, making the support mechanism both effective and easily manufacturable.
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 adhesive layer acts as a cushioning material, reducing damage and peeling of the protective member, while maintaining the optical performance and stability of the light-guiding device across varying environmental conditions.
Implementation Method 1
An adhesive layer is formed between the body member and the protective member
Implementation Method 2
a protective member having a sheet shape and configured to cover a body member in a region corresponding to an optical surface
Implementation Method 3
the adhesive layer acts as a cushioning material, reducing damage and peeling of the protective member
Data Source
AI summary
A light-guiding device is configured to accept image light through a light incidence part, guide the image light through reflection, and emit, to outside through a light emission part, the image light that is guided, the light-guiding device includes a protective member having a sheet shape and configured to cover a body member in a region corresponding to an optical surface of a surface of the light-guiding device, and an adhesive layer is formed between the body member and the protective member.