OLED Display Casing With Coupled Folding Motion
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Solution Overview
Problem
Flexible display devices experience internal stress, delamination, and slip between layers due to bending, which can lead to cracks and reduced adhesion strength in OLED modules.
Innovation Solution
A display device with a casing that includes coupling portions and bending regions to synchronize the folding of the display surface, reducing internal stress by pulling end regions in opposite directions to counteract layer slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the OLED module layers are firmly bonded together with adhesive, then adhesion strength is improved, but internal stress and delamination occur when the display device is bent
Solution Approach 1:
The invention introduces a release film that can be separated into multiple functional layers: a base layer for adhesion and a release layer for stress relief. This segmentation allows the adhesive system to provide both strong bonding and stress management during bending operations.
Solution Approach 2:
The release film acts as an intermediary element between the OLED module layers and the external environment. It mediates the stress distribution during bending, preventing direct stress transmission that would cause delamination while maintaining firm adhesion during normal operation.
2Adaptability or versatility
If the display device is folded repeatedly, then adaptability is improved, but plastic deformation of adhesive occurs and adhesion strength decreases
Solution Approach 1:
The release film incorporates a viscoelastic layer that dynamically adjusts its mechanical properties during folding cycles. This dynamic behavior allows the adhesive system to accommodate repeated folding motions without permanent plastic deformation, maintaining adhesion strength over time.
Solution Approach 2:
The invention changes the physical parameters of the adhesive system by introducing a viscoelastic layer with temperature-dependent and time-dependent mechanical properties. This allows the adhesive to exhibit different characteristics during folding (more compliant) versus normal operation (more rigid), resolving the contradiction between adaptability and strength.
3Manufacturing precision
If layers are bonded with adhesive, then manufacturing precision is improved, but slip between layers occurs during bending causing dimensional variation
Solution Approach 1:
The invention creates a composite adhesive structure combining a pressure-sensitive adhesive layer with a viscoelastic release film. This composite material system provides both the bonding precision needed for manufacturing and the dimensional stability required during bending, as the viscoelastic component compensates for differential expansion and contraction between layers.
Data Source
AI summary
A display device includes: a casing; and an OLED module. The casing includes a coupling portion coupling together, on a coupling surface, a bending region and an end region. When a display surface of the OLED module is folded into a valley shape in a first direction, the coupling portion pulls an end region of the casing in a second direction for folding the display surface into a mountain shape. The second direction is opposite to the first direction.