Neutral Plane Compensation Member for Flexible Display Stress Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible display apparatuses face issues with cracking and layer separation due to stress differences between the polarizing member and the display panel when folded, leading to increased defects and reduced durability.
Innovation Solution
Incorporating a neutral plane compensation member with specific thickness and modulus ranges between the polarizing member and the display panel to reduce stress differences and enhance puncture strength, thereby minimizing cracks and layer lift-off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display apparatus is folded, then portability is improved, but stress differences between layers cause cracks and layer separation
Solution Approach 1:
A neutral plane compensation member is introduced as an intermediary layer between the display panel and the polarizing member. This compensation member has a neutral plane positioned within its thickness to specifically counterbalance the tensile stress applied to the polarizing member during folding, thereby preventing cracks and layer separation while maintaining the flexibility and portability of the display apparatus
Solution Approach 2:
The patent modifies the structural parameters of the display apparatus by introducing a compensation member with specific mechanical properties (neutral plane position, thickness, modulus of elasticity) that differ from the existing layers. This parameter change allows the system to maintain structural integrity under folding stress while preserving flexibility
2Reliability
If a neutral plane compensation member is added, then stress differences are reduced and crack resistance is improved, but device complexity increases
Solution Approach 1:
The neutral plane compensation member is strategically positioned only in the region where stress concentration occurs (between the display panel and polarizing member), and its neutral plane is locally positioned within its thickness to specifically address the tensile stress issue. This localized approach provides crack resistance without unnecessarily complicating the entire device structure
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 neutral plane compensation member effectively reduces stress differences and enhances the puncture strength of the display apparatus, reducing the occurrence of cracks and layer separation when folded, thus improving the overall durability and reliability of flexible displays.
Implementation Method 1
a modulus of elasticity of the first layer is in a range from 1.0×10^8 Pa to 1.0×10^10 Pa, and a thickness of the second layer is in a range from 20 μm to 60 μm, and a modulus of the second layer is in a range of 1.0×10^4 Pa to 1.0×10^6 Pa
Data Source
AI summary
A display apparatus includes a display panel part, a polarizing member, and a neutral plane compensation member disposed between the display panel part and the polarizing member. The neutral plane compensation member includes a first layer and a second layer, a thickness of the first layer being in a range of 20 μm to 60 μm, and a modulus of elasticity of the first layer being in a range of 1×108 Pa to 1×1010 Pa, a thickness of the second layer being in a range of 20 μm to 60 μm, and a modulus of elasticity of the second layer being in a range of 1×104 Pa to 1×106 Pa.