Flexible Display Protection Layer Bending Adherence
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Solution Overview
Problem
Emissive display devices face damage during bending due to compressive and tensile forces, which can lead to cracking and lifting of protection layers, especially in the bending regions.
Innovation Solution
A display device design that includes a flexible substrate with a protection layer containing a photo-hardening organic material, a polarization layer with an inclination part, and a supporting member with an opening overlapping the bending region, enhancing adherence and protection by contacting the protection layer with the polarization layer's inclination part and including a fixed part inside a through hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection layer is applied to cover the bending region, then the display device is protected from damage, but the protection layer may crack or lift during bending due to compressive and tensile forces
Solution Approach 1:
The protection layer is divided into multiple regions with different thicknesses: a first thickness in the bending region and a second thickness in the non-bending region. This segmentation allows the protection layer to flex during bending without cracking while maintaining adequate protective coverage
Solution Approach 2:
Different regions of the protection layer are given different local properties - the bending region has a reduced thickness to accommodate flexing, while the non-bending region maintains full thickness for optimal protection. This local differentiation resolves the contradiction between protection and flexibility
2Adaptability or versatility
If the protection layer is made thinner to allow bending, then flexibility is improved, but the protective capability is reduced
Solution Approach 1:
The protection layer thickness is segmented into at least two different thicknesses: a first thickness in the bending region that allows flexibility, and a second thickness in the non-bending region that provides enhanced protection. This resolves the contradiction by providing both flexibility where needed and protection where required
Solution Approach 2:
The protection layer transitions from a uniform two-dimensional layer to a three-dimensional structure with varying thickness. This dimensional change allows the layer to accommodate bending stresses while maintaining protective functionality in different regions
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 enhanced protection layer adherence and structural design effectively prevent or reduce damage to the display device during bending, ensuring durability and reliability.
Implementation Method 1
the protection layer includes a photo-hardening organic material
Data Source
AI summary
A display device includes: a display panel including a bending region; and a flexible printed circuit film connected to the display panel, the display panel including: a substrate; a display active layer on the substrate to display an image; a protection layer on the substrate; and a polarization layer on the display active layer, and the polarization layer includes an inclination part at a side surface thereof, the protection layer covers the bending region, and a side of the protection layer is in contact with the inclination part.