Bendable Display Sealant with Localized Young's Modulus
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Solution Overview
Problem
Bendable display devices with the ADS mode experience light leakage due to optical path differences caused by strain from glass substrates during bending, which is not present in VA mode devices where liquid crystal molecules remain vertical.
Innovation Solution
A bendable display panel design with a first sealant portion along bendable edges having a lower Young's modulus than a second sealant portion along non-bendable edges, reducing force on glass substrates and minimizing optical path differences, thereby reducing leakage. The first sealant portion includes plasticizers like o-benzoic acid ester or epoxy compounds, while the second sealant portion does not, ensuring consistent optical axis orientations across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform sealant is used along all edges of the bendable display panel, then the manufacturing process is simple, but the glass substrates deform during bending causing optical path differences and light leakage
Solution Approach 1:
The patent applies different sealant properties to different locations: the first sealant portion along bendable edges has lower Young's modulus (softer) to reduce deformation, while the second sealant portion along non-bendable edges has higher Young's modulus (harder) for stable sealing. This local differentiation resolves the contradiction by optimizing each region's sealant properties to its specific functional requirements.
Solution Approach 2:
The sealant is divided into distinct segments: a first sealant portion for bendable edges and a second sealant portion for non-bendable edges. This segmentation allows independent optimization of each portion's mechanical properties, enabling the bendable edges to flex without causing optical path differences while maintaining stable sealing at non-bendable edges.
2Strength
If the sealant has high Young's modulus for strong sealing, then the sealing strength is improved, but the glass substrates experience more strain during bending causing optical path differences
Solution Approach 1:
The patent assigns different Young's modulus values to different sealant portions based on their functional requirements. The first sealant portion along bendable edges uses lower Young's modulus to minimize strain on glass substrates during bending, preventing optical path differences. The second sealant portion along non-bendable edges uses higher Young's modulus to provide strong sealing where bending does not occur, thus resolving the contradiction between sealing strength and optical path difference.
3Object-affected harmful factors
If the sealant has low Young's modulus to reduce deformation, then optical path differences are minimized, but the sealing strength is reduced
Solution Approach 1:
The patent optimizes sealant properties locally: the first sealant portion along bendable edges has lower Young's modulus to minimize deformation and optical path differences during bending. The second sealant portion along non-bendable edges has higher Young's modulus to provide adequate sealing strength where bending does not occur. This spatial differentiation resolves the contradiction by matching sealant mechanical properties to local functional demands.
Solution Approach 2:
The sealant is segmented into a first portion for bendable edges and a second portion for non-bendable edges, each with optimized Young's modulus. This segmentation enables the first portion to be soft enough to reduce deformation while the second portion remains hard enough to provide strong sealing, eliminating the need to compromise overall sealing strength to reduce deformation.
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
Significantly reduces leakage by minimizing deformation of glass substrates and maintaining consistent optical axis orientations, enhancing the display quality of bendable ADS mode devices.
Implementation Method 1
a first sealant portion disposed along bendable edges of the bendable display panel has a Young's modulus smaller than that of a second sealant portion disposed along non-bendable edges
Data Source
AI summary
A bendable display panel and a manufacturing method thereof and a bendable display device. The bendable display panel includes a first substrate, a second substrate, a sealant for sealing the first substrate and the second substrate, and a liquid crystal layer between the first substrate and the second substrate. A first sealant portion disposed along bendable edges of the bendable display panel has a Young's modulus smaller than that of a second sealant portion disposed along non-bendable edges of the bendable display panel. The sealant includes the first sealant portion and the second sealant portion.