Patterned Adhesive for Flexible Display Folding
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Solution Overview
Problem
Conventional adhesives for flexible displays fail to adequately respond to folding and bending, leading to stress on the display panel and difficulty in returning to the original state, often resulting in cracking or prolonged return times.
Innovation Solution
A patterned adhesive with a strain layer and multiple spaced-apart divided strain layers, integrated with the display panel and back plate, allowing for compressive deformation and easy return to the original state through the formation of neutral planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional adhesive is used to bond the display panel and back plate, then the adhesive maintains its set shape after heat-setting or photo-setting, but the adhesive cannot respond to folding or bending operations, causing stress concentration and potential cracking
Solution Approach 1:
The adhesive layer is divided into multiple segments along the folding line, creating a patterned adhesive structure. These segmented adhesive portions can independently deform during folding operations, allowing the adhesive to adapt to the bending of the display panel while maintaining overall bonding functionality. The segmentation enables each portion to respond locally to stress without compromising the entire adhesive layer.
Solution Approach 2:
The adhesive is designed with dynamic characteristics that allow it to change its mechanical properties during folding. The patterned adhesive portions can deform, compress, and expand dynamically in response to the folding motion, transitioning from a rigid set state to a flexible adaptive state during operation, and returning to the original state after unfolding.
2Strength
If the adhesive is made with similar flexibility to the display panel or back plate, then the adhesive can contact surfaces with high attractive force, but opposite surfaces of the adhesive are deformed by different attractive forces during folding operations
Solution Approach 1:
By segmenting the adhesive layer into multiple independent portions, the internal stress during folding is distributed across these separate segments rather than concentrated in a single continuous layer. Each segmented portion experiences reduced stress differential, preventing deformation and maintaining bonding strength during folding operations.
Solution Approach 2:
The patterned adhesive creates local variations in adhesive properties along the folding line. Different regions of the adhesive layer have optimized characteristics for their specific locations, with adhesive portions positioned to handle different stress conditions during folding, thereby reducing overall internal stress while maintaining strong bonding.
3Reliability
If the adhesive remains set after heat-setting or photo-setting, then the adhesive provides stable bonding, but the adhesive cannot easily return to the original state during repeated folding operations
Solution Approach 1:
The patterned adhesive design enables dynamic response to folding operations. The segmented adhesive portions can temporarily deform during folding due to their flexible configuration, then elastically return to their original set shape after unfolding. This dynamic behavior allows the adhesive to maintain reliable bonding while accommodating repeated folding cycles.
Solution Approach 2:
The patterned adhesive structure acts as a cushioning mechanism that anticipates and absorbs the stress of folding operations. The segmented design allows the adhesive to compress and deform in advance during folding, protecting the bonded interfaces from excessive stress, and then recover afterward, ensuring reliable bonding over repeated cycles.
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 patterned adhesive effectively disperses stress during folding, preventing panel cracking and enabling rapid return to the original state, addressing the limitations of conventional adhesives by forming neutral planes that reduce strain and facilitate easy unfolding.
Implementation Method 1
the strain layer, which is compressively deformed in response to an operation of an adherend to be folded, so that the patterned adhesive can easily return to an original state by formation of a plurality of inner neutral planes upon deformation
Data Source
AI summary
A patterned adhesive can prevent detachment and easily return to an original state even during repeated folding operations, and a flexible display including the same are discussed. The patterned adhesive includes a patterned adhesive layer so that it can easily return to an original state by formation of a plurality of neutral planes upon compression and extension through a folding operation.