Silver Nanowire PMMA Flexible OLED Anode
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Solution Overview
Problem
The existing ITO electrodes in flexible OLED display panels suffer from increased sheet resistance after multiple bendings, are not suitable for curved shapes, and face material scarcity and brittleness issues, making them unsuitable for intelligent wearable devices.
Innovation Solution
A flexible OLED display panel with a conductive layer made of a silver-nanowires and polymethyl methacrylate (PMMA) mixture and a flexible supporting layer of PMMA, which reduces surface roughness and improves electrical conductivity and flexibility, allowing for self-supporting capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO electrode is used in flexible OLED display panel, then high transmittance and high electrical conductivity are achieved, but sheet resistance rapidly rises after multiple bendings and the electrode becomes brittle
Solution Approach 1:
The patent uses a composite structure consisting of a flexible supporting layer (PMMA), a conductive layer (silver nanowires in PMMA matrix), and a metallic anode layer. This composite material system combines the flexibility of PMMA with the electrical conductivity of silver nanowires and ITO, resolving the contradiction between maintaining electrical conductivity and achieving flexibility through material composition rather than single-material reliance
Solution Approach 2:
The patent replaces the traditional rigid ITO electrode with a flexible conductive layer made of silver nanowires embedded in a PMMA matrix, deposited as a thin film structure. This thin film approach with flexible substrate enables the electrode to withstand multiple bendings without rapid increase in sheet resistance, while maintaining the necessary electrical conductivity for OLED operation
2Adaptability or versatility
If ITO electrode is applied to flexible OLED, then initial electrical conductivity is high, but the electrode cannot adapt to different curved shapes when worn on different body parts
Solution Approach 1:
The conductive layer is formed as a thin flexible film structure that can conform to various curved surfaces. The thin film nature combined with the flexible PMMA substrate allows the electrode to adapt to different curved shapes on human body parts while maintaining electrical conductivity, enabling wearable device versatility
3Reliability
If ITO is used as electrode material, then high transmittance and conductivity are achieved, but material resources become scarce and cost increases
Solution Approach 1:
The patent creates a composite conductive system where silver nanowires provide the primary conductivity pathway, reducing reliance on ITO material. The PMMA matrix serves as a flexible support medium, allowing the system to achieve necessary electrical conductivity with reduced ITO content, thereby addressing material scarcity and cost issues
Solution Approach 2:
The patent changes the material composition parameters by introducing silver nanowires as an alternative conductive component to ITO. This parameter change in material composition allows the system to maintain electrical conductivity while reducing dependence on scarce ITO resources
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 electrical conductivity and flexibility of the metallic anode layer, enabling the OLED display panel to adapt to different curved shapes and providing good overall flexible support for intelligent wearable devices.
Implementation Method 1
a material of the conductive layer is a mixture of silver-nanowires and polymethyl methacrylate (PMMA)
Implementation Method 2
a material of the flexible supporting layer is PMMA
Data Source
AI summary
The present application provides a display panel, a manufacturing method and an intelligent wearable device of flexible organic light-emitting diode (OLED). The display panel includes a conductive layer and a metallic anode layer disposed at one side of the conductive layer, wherein a material of the conductive layer is a mixture of silver-nanowires and polymethyl methacrylate (PMMA).