Window Substrate Shock Wave Transmission Layer Design
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Solution Overview
Problem
Flexible display devices face challenges in shock resistance due to the generation of shock waves when subjected to impacts, which can lead to bending breakage and damage, particularly when objects like pens collide with the surface, causing stress that may result in cracking or breaking.
Innovation Solution
A window substrate is designed with a glass substrate and a shock wave transmission layer on one surface, where the density and elastic modulus of the shock wave transmission layer are less than those of the glass substrate, allowing shock waves to be transmitted and dissipated, and a coating layer on the other surface with higher density and elastic modulus to reinforce the substrate, enhancing shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible display device is made thinner and more flexible, then ease of operation and portability are improved, but shock resistance and reliability deteriorate
Solution Approach 1:
The shock wave transmission layer is divided into multiple sub-transmission layers with different density and elastic modulus values. Each sub-layer is positioned at specific distances from the glass substrate, creating a gradient structure that progressively transmits and dissipates shock waves, thereby protecting the flexible display from impact damage while maintaining flexibility.
Solution Approach 2:
The shock wave transmission layer has non-uniform properties throughout its thickness. The density and elastic modulus vary at different positions, being higher near the glass substrate and lower toward the outer surface. This local variation optimizes shock wave transmission and dissipation at different depths, protecting the flexible display without compromising its bendability.
2Reliability
If a shock wave transmission layer is added to improve shock resistance, then reliability is improved, but device complexity increases
Solution Approach 1:
The shock wave transmission layer is segmented into multiple sub-transmission layers, each with specific density and elastic modulus values. This segmentation allows the complex shock protection function to be achieved through simpler, standardized layers that can be manufactured independently and then assembled, reducing overall manufacturing complexity.
Solution Approach 2:
The invention uses systematic parameter changes in density and elastic modulus across the shock wave transmission layer. By controlling these parameters to follow specific patterns (higher near glass substrate, lower outward), the design achieves optimal shock protection while maintaining manufacturing simplicity through predictable material property gradients.
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 window substrate effectively reduces bending deformation and improves shock resistance, allowing the display device to withstand impacts without damage, as demonstrated by increased drop test heights without breaking.
Implementation Method 1
a shock wave transmission layer on a first surface of the glass substrate, wherein a density and elastic modulus of the shock wave transmission layer are respectively less than those of the glass substrate
Implementation Method 2
the density and elastic modulus of the shock wave transmission layer are respectively less than those of the glass substrate
Data Source
AI summary
A window substrate includes a glass substrate, and a shock wave transmission layer on a first surface of the glass substrate, wherein a density and elastic modulus of the shock wave transmission layer are respectively less than those of the glass substrate.