Flexible Substrate Light Extraction Isolation Structures
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Solution Overview
Problem
Flexible display devices have relatively lower luminous efficiency, requiring higher current density, which leads to a shorter lifetime under the same luminance conditions.
Innovation Solution
A flexible substrate with light extraction isolation structures and multiple light extraction layers, each optimized for different wavelengths of incident light to improve light extraction efficiency, is used in conjunction with light-emitting units to enhance external quantum efficiency and prolong device lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If higher current density is used to achieve the same luminance, then luminous efficiency is improved, but device lifetime is shortened
Solution Approach 1:
The patent divides the light extraction function into multiple wavelength-specific layers. Each light extraction layer is designed to extract light of a specific wavelength range, segmenting the overall light extraction process into multiple specialized stages. This segmentation allows optimized light extraction for each wavelength without requiring uniform high current density across all wavelengths, thereby improving luminous efficiency while reducing overall energy consumption and extending device lifetime.
Solution Approach 2:
The patent applies local quality by creating light extraction layers with different properties for different wavelength ranges. Each layer has specific optical properties tailored to its target wavelength, allowing localized optimization of light extraction efficiency. This means that each region of the device can operate at optimal current density for its specific wavelength function, improving overall luminous efficiency while avoiding excessive current density that would shorten lifetime.
2Reliability
If multiple light extraction layers with different wavelength optimizations are added, then external quantum efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple light extraction functions into a integrated multi-layer structure. Instead of having separate components for different wavelength extractions, the different light extraction layers are combined in a single stacked architecture within the flexible substrate. This merging approach improves external quantum efficiency by capturing and extracting multiple wavelength ranges while maintaining a relatively compact and manageable device structure, thus limiting the increase in complexity.
Solution Approach 2:
The flexible substrate structure serves multiple functions: it provides mechanical flexibility, electrical insulation, and houses multiple wavelength-specific light extraction layers. Each layer is designed to be multi-functional, contributing to both structural integrity and optical performance for its specific wavelength range. This universality allows the device to achieve high external quantum efficiency across multiple wavelengths without proportionally increasing overall device complexity.
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 optimizes external quantum efficiencies of light-emitting units, improving luminous efficiency and ensuring even degradation and extended lifespan of flexible display devices.
Implementation Method 1
each of the light extraction layers corresponding to the different wavelengths of incident light has different improvement ratios of light extraction efficiency when different wavelengths of incident light passes through each of the light extraction layers
Data Source
AI summary
The present disclosure provides a flexible substrate, a flexible display device having the same, and a preparation method thereof. The flexible substrate includes a first flexible material layer, light extraction isolation structures, and a plurality of light extraction layers; the light extraction isolation structures are disposed on a surface of the first flexible material layer to form a plurality of light extraction regions isolated from each other between the light extraction isolation structures; the plurality of light extraction layers are disposed one-to-one respectively in at least past of the plurality of the light extraction regions, so that each of the light extraction layers corresponding to different wavelengths of incident light has different improvement ratios of light extraction efficiency when the different wavelengths of incident light passes through each of the light extraction layers.