Transparent Organic EL Lead-Out Electrode Transmittance Matching
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Solution Overview
Problem
Current transparent organic electroluminescence elements face challenges with durability and visibility due to high electrical resistance and uncomfortable feelings caused by differences in transparency between the lead-out electrode and the organic electroluminescence element, particularly with metal film electrodes like MAM and ITO.
Innovation Solution
A transparent organic electroluminescence element with a lead-out electrode that maintains a total light transmittance within 90% to 110% of the organic electroluminescence element, featuring a thin metal line and metal oxide layer with a polarization suppressing structure, ensuring low surface resistance and improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal film electrode (MAM) is used to improve conductivity, then electrical resistance decreases, but light transmittance decreases causing uncomfortable visibility
Solution Approach 1:
The lead-out electrode is divided into multiple thin metal lines instead of a single thick metal film. This segmentation reduces the overall metal coverage area while maintaining electrical conductivity, thereby improving light transmittance and visibility while still providing sufficient electrical connection
Solution Approach 2:
The electrode structure uses different materials and thicknesses in different regions: thin metal lines for conductivity where needed, and transparent or semi-transparent regions for visibility. This local differentiation allows simultaneous optimization of both electrical performance and optical appearance
2Illumination intensity
If ITO is used as lead-out electrode to improve light transmittance, then transparency increases, but electrical resistance increases causing voltage drop
Solution Approach 1:
The lead-out electrode uses a composite structure combining thin metal lines (for conductivity) with transparent or semi-transparent materials (for light transmittance). This composite approach leverages the advantages of both materials: the metal provides low resistance while the transparent material maintains visibility
Solution Approach 2:
Instead of using a continuous ITO layer that blocks light, the conductive path is segmented into thin metal lines that occupy minimal space, allowing light to pass through the gaps while still providing necessary electrical connection
3Reliability
If functional members (sealing/lead-out electrodes) are disposed around light emitting unit, then element functionality is improved, but transparency uniformity decreases causing uncomfortable visibility
Solution Approach 1:
The sealing and lead-out electrode structures are designed with varying transparency levels appropriate to their functional requirements, while maintaining overall visual uniformity. Critical functional areas use more opaque materials, while peripheral areas use more transparent materials to maintain appearance uniformity
Solution Approach 2:
The electrode materials and structures are selected and designed to match or blend with the overall appearance of the transparent organic EL element, minimizing visual contrast and maintaining uniform transparency appearance across the entire device
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 provides an organic electroluminescence element with enhanced durability, low resistance, and improved visibility by matching the transmittance of the lead-out electrode to the organic electroluminescence element, reducing uncomfortable feelings and voltage drops.
Implementation Method 1
A transparent organic electroluminescence element, including: at least an organic electroluminescence element portion and a lead-out electrode portion
Data Source
AI summary
An object of the present invention is to provide a transparent organic electroluminescence element in which durability is excellent, a transparent lead-out electrode of low resistance is provided, and there is no uncomfortable feeling in visibility of the entire element. The transparent organic electroluminescence element according to the present invention is a transparent organic electroluminescence element including: at least an organic electroluminescence element portion and a lead-out electrode portion, in which two-sided light emission is capable of being performed, wherein a total light transmittance (%) of the lead-out electrode portion in a visible light range is in a range of 90% to 110%, with respect to a total light transmittance (%) of the organic electroluminescence element portion in a visible light range at the time of non-light emission.