UV-Blocking Functional Layer for Flexible Display Substrates
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Solution Overview
Problem
Flexible display devices are vulnerable to ultraviolet light, which can damage or deform the self-luminous elements inside the display panel, leading to reduced reliability and lifetime.
Innovation Solution
A display cover substrate with a flexible substrate and a surface reinforcing layer, along with a functional layer having multiple layers with different refractive indexes, is designed to reduce UV light transmittance while maintaining high transmittance in visible light wavelengths, thereby protecting the display panel from UV damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display device uses a thin structure to enable bending, then flexibility and bendability are improved, but the device becomes vulnerable to ultraviolet light damage
Solution Approach 1:
The cover substrate is divided into multiple functional layers: a flexible substrate base layer, a surface reinforcing layer, and a functional layer with multiple sub-layers having different refractive indexes. This segmentation allows each layer to perform its specific function while maintaining overall flexibility
Solution Approach 2:
The patent uses composite material structures combining flexible substrate materials with UV-blocking functional layers. The functional layer contains multiple materials with different refractive indexes that work together to block UV light while maintaining flexibility and optical performance
2Strength
If a surface reinforcing layer is added to improve strength, then hardness and strength are improved, but the overall thickness increases
Solution Approach 1:
The surface reinforcing layer is designed as a thin film structure that provides necessary strength and hardness protection while minimizing thickness increase. The functional layer with multiple sub-layers also operates as thin films to achieve UV blocking without significant thickness addition
3Reliability
If multiple functional layers with different refractive indexes are added to block UV light, then UV protection is improved, but device complexity increases
Solution Approach 1:
The functional layer is designed with multiple sub-layers having different refractive indexes, where each sub-layer is optimized for specific UV wavelength ranges. This local quality differentiation enables effective UV blocking across the entire spectrum while maintaining a relatively simple overall 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 solution enhances the strength and reliability of the display cover substrate and the overall display device by effectively blocking UV light, preventing damage to the display panel and improving its lifetime.
Implementation Method 1
the functional layer includes a plurality of layers having different refractive indexes
Implementation Method 2
an average light transmittance is less than 90% and a minimum light transmittance is 60% or less in a light wavelength band of 250 nm to 388 nm
Data Source
AI summary
A display cover substrate according to an embodiment includes: a flexible substrate including one surface and the other surface opposite to the one surface; a surface reinforcing layer disposed on the one surface; and a functional layer disposed on the surface reinforcing layer, wherein the functional layer includes a plurality of layers having different refractive indexes, and an average light transmittance is 90% or more in a light wavelength band of 388 nm to 700 nm, and an average light transmittance is less than 90% and a minimum light transmittance is 60% or less in a light wavelength band of 250 nm to 388 nm.