Adhesive Layer Peeling for Display Panel Pressure Relief
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Solution Overview
Problem
Portable terminal devices for sports, equipped with lithium-ion batteries, face the risk of internal pressure buildup due to gas production from batteries, which can lead to accidental rupture or display panel ejection, especially when exposed to external impacts or temperature changes, compromising waterproofness and user safety.
Innovation Solution
An electronic device design featuring a case body with an inward flange and a display panel mounted on it, utilizing a foam-based adhesive layer that gradually peels off to release gas and prevent sudden pressure buildup, thereby maintaining air-tightness and preventing display panel ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device is designed with high air-tightness and waterproofness, then the device can maintain waterproofness and air-tightness, but gas produced from the battery cannot be released, causing inner pressure to rise to high levels
Solution Approach 1:
The adhesive layer acts as an intermediary between the sealed case interior and the exterior environment. It provides a controlled path for gas to escape through gradual peeling, while maintaining the overall air-tightness and waterproofness of the device structure.
Solution Approach 2:
The adhesive layer functions as a flexible thin film that can gradually peel off in response to pressure changes. This allows the sealed structure to maintain its integrity while providing a controlled mechanism for pressure equalization through gradual adhesive failure rather than sudden rupture.
2Volume of moving object
If the device size is reduced to that of wristwatches, then the device becomes portable for sports, but narrow gaps for gas release are not permitted, compromising air-tightness
Solution Approach 1:
The adhesive layer serves as a mediator that enables pressure equalization within the compact device structure without requiring external narrow gaps. It provides an internal mechanism for controlled gas release that maintains the small form factor while preserving air-tightness during normal operation.
3Reliability
If the battery is subjected to external impact or pressure, then the battery may produce gas, but conventional devices require battery covers or permeable membranes that compromise air-tightness
Solution Approach 1:
The adhesive layer's failure mode is converted from a harmful sudden rupture into a beneficial controlled gradual peeling process. When gas pressure builds up from battery reactions due to impact or temperature changes, the adhesive peels gradually to release pressure, transforming what would be a dangerous sudden failure into a safe controlled pressure equalization.
4Reliability
If the display panel is firmly mounted to maintain air-tightness, then the display panel remains secure, but gas pressure cannot be released, causing the display panel to pop out swiftly
Solution Approach 1:
The adhesive layer provides beforehand cushioning by serving as a pressure relief mechanism before critical pressure levels are reached. The gradual peeling process absorbs and dissipates pressure buildup over time, preventing the sudden display panel ejection that would occur without this intermediate pressure equalization mechanism.
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 manages internal pressure by allowing gradual gas release, preventing display panel ejection and maintaining device integrity, ensuring both air-tightness and waterproofness, thus avoiding potential user injuries.
Implementation Method 1
an adhesive layer which is provided between the display panel and the inward flange, and allows gas to be released gradually by peeling off
Data Source
AI summary
An electronic device includes a case body which includes an opening and a battery holder holding a battery, an inward flange which is disposed at least a part of a circumference of the opening, a display panel which is mounted on the inward flange so as to cover the opening of the case body, and an adhesive layer which is provided between the display panel and the inward flange. The adhesive layer gradually peels off to leak gas in a space sealed by the case body and the display panel, so as to prevent the display panel from swiftly popping out of the opening when an inner pressure of the space increases.