Flexible Display Panel Neutral Layer for Bending Stress Relief
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Solution Overview
Problem
Conventional flexible display panels suffer from damage during bending due to broken circuits or encapsulation layers, leading to water and oxygen intrusion, which affects yield and is costly.
Innovation Solution
A display panel design with a substrate layer, flexible screen body, adhesive layer, and touch control layer, where the adhesive layer acts as a neutral layer, and the bearing layer includes grooves to release stress, while the touch control layer has stretch-proof lines, enhancing bending performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is bent to achieve flexible display, then adaptability and versatility are improved, but the flexible screen body may be damaged due to pulling of circuits or encapsulation layer
Solution Approach 1:
The display panel is divided into multiple layers (substrate layer, flexible screen body, adhesive layer, touch control layer, bearing layer) with each layer having specific functions. The adhesive layer is positioned as the neutral layer to bear bending stress, isolating the flexible screen body from tensile stress during bending.
Solution Approach 2:
The adhesive layer serves as an intermediary neutral layer between the flexible screen body and the touch control layer. During bending, this neutral layer absorbs the stress, preventing direct transmission of tensile stress to the flexible screen body and its circuits.
Solution Approach 3:
The bearing layer is provided with grooves at specific locations (folding lines) where stress concentrates during bending. This local structural modification allows stress release at critical points while maintaining overall panel integrity.
2Strength
If the bearing layer is made thicker to improve strength, then strength is improved, but the bending performance deteriorates due to excessive stress concentration
Solution Approach 1:
Instead of uniformly thinning the bearing layer, grooves are introduced only at specific locations (folding lines) where bending stress concentrates. This maintains the overall thickness and strength of the bearing layer while providing localized stress relief paths.
Solution Approach 2:
The bearing layer is designed with a porous structure (grooves) that allows stress to be distributed and released through the voids. This reduces stress concentration during bending while maintaining the layer's overall structural integrity and strength.
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
Prevents damage to the flexible screen body by distributing stress effectively, improving bending capability and reducing material waste.
Implementation Method 1
at least part of the adhesive layer is configured as a neutral layer of the display panel. Both the substrate layer and the flexible screen body are subject to a compressive stress when the display panel is bent. The touch control layer is subject to a tensile stress when the display panel is bent.
Implementation Method 2
By providing the at least one groove in the bearing layer, when the bearing layer is subject to a stress caused by deformation, the stress may be released through the at least one groove.
Implementation Method 3
The touch control layer is provided with at least one stretch-proof metal line that is a curved line. The touch control layer is subject to the largest stress in the display panel when the display panel is bent.
Data Source
AI summary
A display panel and a display device. The display panel includes: a substrate layer, a flexible screen body, an adhesive layer and a touch control layer that are stacked in order. Each of the substrate layer, the flexible screen body, the adhesive layer and the touch control layer has a particular film/layer thickness. At least part of the adhesive layer is configured as a neutral layer of the display panel. Both the substrate layer and the flexible screen body are subject to a compressive stress when the display panel is bent. The touch control layer is subject to a tensile stress when the display panel is bent.