Flexible Substrate Fiber Reinforced Layer Bending Stress Dispersion
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Solution Overview
Problem
Existing flexible substrates for bendable display devices suffer from deformation and bending stress, leading to circuit dislocation and reduced yield rates, which shortens the bending life and increases costs.
Innovation Solution
A flexible substrate with a fiber-reinforced layer, featuring different distribution densities in bending, non-bending, and boundary regions, is designed to disperse bending stress and protect semiconductor devices, comprising a base layer with a bending region and a non-bending region, and a fiber-reinforced layer applied using methods like electrospinning or stereospecific polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used for bendable display, then bendable display with smaller bending radius can be realized, but the substrate experiences deformation and bending stress causing circuit dislocation and reduced yield rate
Solution Approach 1:
The patent applies composite materials by combining the flexible base layer with a fiber-reinforced layer to create a hybrid structure. The fiber-reinforced layer contains fibers (such as glass fibers, aramid fibers, or carbon fibers) embedded in a matrix material, forming a composite that provides both flexibility and mechanical strength. This composite structure prevents circuit dislocation while maintaining bendable display capability.
Solution Approach 2:
The patent implements local quality by creating different fiber distribution densities in different regions of the flexible substrate. The fiber-reinforced layer has a first region with a first fiber distribution density and a second region with a second fiber distribution density, where the densities differ between regions. This localized variation in fiber density allows the substrate to have different mechanical properties in different areas, providing enhanced protection in regions prone to deformation while maintaining overall flexibility.
2Adaptability or versatility
If existing flexible substrate is bent, then bendable display is achieved, but bending stress is generated which influences bending life of the display device
Solution Approach 1:
The fiber-reinforced composite layer acts as a reinforcement that distributes and reduces bending stress during repeated bending cycles. The fibers provide tensile strength that counteracts the bending stress, preventing fatigue failure and extending the bending life of the display device while maintaining its bendable capability.
Solution Approach 2:
By varying the fiber distribution density in different regions, the patent optimizes stress distribution during bending. Regions with higher fiber density provide additional reinforcement where bending stress is most intense, thereby extending the bending life in critical areas while preserving the overall flexibility and bendable display functionality.
3Reliability
If fiber reinforced layer with different distribution densities is applied, then bending stress is dispersed and circuit dislocation is prevented, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing different fiber distribution densities in different regions of the flexible substrate. The fiber-reinforced layer is configured with a first region having a first fiber distribution density and a second region having a second fiber distribution density. This regional variation provides targeted reinforcement where needed while maintaining simplicity in other areas, balancing reliability improvement with device complexity management.
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 circuit dislocation, enhances yield rates, and prolongs the bending life of the display device by dispersing bending stress through a tailored fiber distribution, improving the structural integrity of the flexible substrate.
Implementation Method 1
the fiber reinforced layer is provided on a surface of the base layer and has different distribution densities at the bending region and the non-bending region... can disperse bending stress generated when the flexible substrate is bent
Implementation Method 2
fixing monomers of polymer on a rigid substrate and curing the monomers of polymer to form a bendable base layer
Data Source
AI summary
The present disclosure provides a flexible substrate of a bendable display device and a manufacturing method thereof, the flexible substrate includes a bendable base layer, which includes a bending region and a non-bending region; the flexible substrate further includes a fiber reinforced layer, which is provided on a surface of the base layer and has different distribution densities in the bending region and the non-bending region. The flexible substrate of a bendable display device provided in the present disclosure can not only protect semiconductor devices on the flexible substrate, and avoid situations such as dislocation of circuits of electronic components, low yield rate and etc., but can also disperse bending stress generated when the flexible substrate is bent, thereby prolonging the bending life of the display device.