Flexible Display Bending Structure With Overlap Adhesive Layer
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Solution Overview
Problem
Flexible display devices face issues with delamination defects and damage when bent, leading to increased dead space due to cracking of substrates and protective layers.
Innovation Solution
A display device design incorporating a substrate with a bending area, a display active layer, a polarization layer, a protective layer, and an adhesive layer with an extension area that overlaps the protective layer, along with a laminated member, to enhance adhesion and prevent delamination during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective layer is applied to the bent area to prevent cracking, then the substrate and wires are protected from damage, but delamination defects occur when the substrate is bent
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the protective layer and the polarization layer. This adhesive layer extends from the end of the polarization layer toward the bending area by an extension area (50-300 μm in width) to overlap a portion of the protective layer, providing strong adhesion and preventing delamination during bending operations.
2Area of stationary object
If the flexible substrate is bent to reduce dead space, then the non-display area is minimized, but the substrate and wires may crack
Solution Approach 1:
The protective layer is applied in advance to cover the bending area before the bending operation is performed. This preliminary protection prevents cracking of the substrate and wires during the subsequent bending process that reduces dead space.
3Reliability
If the adhesive layer extends to overlap the protective layer, then delamination is prevented, but the structure complexity increases
Solution Approach 1:
The adhesive layer is applied with specific local characteristics: it extends from the end of the polarization layer toward the bending area by an extension area (50-300 μm in width) to overlap a portion of the protective layer. This localized extension provides enhanced adhesion precisely where needed during bending, while maintaining simplicity in non-critical areas.
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 prevents delamination defects and reduces dead space by improving the adherence of the protective layer, allowing the display device to be bent without damage and minimizing non-display areas.
Implementation Method 1
an adhesive layer disposed on a boundary between the polarization layer and the protective layer, the adhesive layer extends from the end of the polarization layer toward the bending area by an extension area to overlap a portion of the protective layer
Data Source
AI summary
A display device includes a substrate that includes a bending area, a display active layer disposed on the substrate and that displays an image, a polarization layer disposed on the display active layer, a protective layer that contacts an end of the polarization layer and covers the bending area of the substrate; and an adhesive layer disposed on a boundary between the polarization layer and the protective layer, the adhesive layer extends from the end of the polarization layer toward the bending area by an extension area to overlap a portion of the protective layer.