OLED Sealing Structure with Temperature-Dependent Stripping Adhesive
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Solution Overview
Problem
The high cost and difficulty in recycling and reusing metal films used in sealing OLED display devices, which are prone to residue and damage during the removal of sealing adhesive layers, leading to increased production costs and resource wastage.
Innovation Solution
A sealing structure comprising a sealing layer and a stripping adhesive layer with changeable stickiness, where the stripping adhesive layer is bonded between the sealing layer and the functional device, allowing for easy separation and recycling of the sealing layer by heating the stripping adhesive layer to a work temperature that weakens its stickiness, without damaging the sealing adhesive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal film is used as a sealing layer to replace glass cover plate, then water and oxygen resistance is improved, but cost increases and recycling difficulty increases
Solution Approach 1:
The sealing structure is divided into multiple functional layers: a sealing layer (metal film or transparent film) for water and oxygen resistance, and a stripping adhesive layer for easy removal. This segmentation allows the sealing layer to maintain its protective function while the stripping adhesive layer enables cost-effective recycling by facilitating simple separation without damage.
2Reliability
If a metal film is used as a sealing layer, then water and oxygen resistance is improved, but recycling and reuse difficulty increases
Solution Approach 1:
A stripping adhesive layer is introduced as an intermediary between the sealing layer and the functional device. This intermediary layer has temperature-dependent adhesion properties: it maintains strong bonding during normal operation but becomes easily separable when heated, enabling simple recycling and reuse of the valuable sealing layer without damage or residue.
3Productivity
If sealing adhesive layer is removed from metal film, then recycling is attempted, but residue and damage occur increasing production costs
Solution Approach 1:
The adhesion parameter of the stripping adhesive layer is made changeable through temperature control. During normal operation, the adhesive layer maintains strong bonding. During recycling, heating to a specific temperature reduces the adhesion strength, allowing the sealing layer to be cleanly separated from both the functional device and the adhesive layer itself, eliminating residue and damage issues.
4Ease of repair
If stripping adhesive layer with changeable stickiness is used, then sealing layer recycling is enabled, but device complexity increases
Solution Approach 1:
The stripping adhesive layer utilizes phase transition or temperature-dependent property changes to achieve changeable stickiness. The material transitions from a high-adhesion state during normal operation to a low-adhesion state when heated, enabling simple recycling. This approach adds minimal structural complexity while achieving the desired recyclability function.
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
Enables the efficient recycling and reuse of the sealing layer, reducing production costs and promoting resource recycling by allowing the sealing layer to be stripped off without residue or damage, thus lowering the overall production costs of display devices.
Implementation Method 1
a material of the stripping adhesive layer is a resin adhesive added with thermal expansion microspheres, or a rubber adhesive added with the thermal expansion microspheres
Data Source
AI summary
A sealing structure, a sealing method, an electronic device and a sealing layer recycling method are provided. The sealing structure is configured for sealing a functional device and includes a sealing layer and a stripping adhesive layer. The sealing layer covers the functional device; the stripping adhesive layer is bonded between the sealing layer and the functional device, and the stripping adhesive layer has a changeable stickiness to assist stripping off of the sealing layer.