Organic Light-Emitting Element Series Connection via Non-Luminous Surface Electrodes
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Solution Overview
Problem
Organic light-emitting elements face challenges with increased sheet resistance of transparent electrodes as the element area grows, leading to inefficiencies in luminous efficiency and difficulty in achieving uniform light emission, necessitating the use of additional auxiliary electrodes or multiple smaller elements for larger applications.
Innovation Solution
The solution involves forming connection electrodes on the non-light-emitting surface of organic light-emitting elements to facilitate easy electrical connection and series connection of multiple elements, allowing for simpler addition or replacement of elements, using extended and connectable terminals with groove and protrusion portions for efficient electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the area of organic light-emitting element is increased, then the luminous flux is improved, but the sheet resistance of transparent electrode is increased
Solution Approach 1:
The patent divides the large-area light-emitting element into multiple smaller sub-elements (e.g., 3x3 cm² divided into nine 1x1 cm² elements). Each sub-element has its own transparent electrode with lower sheet resistance, and they are connected in series to achieve the required total luminous flux without suffering from high sheet resistance in a single large electrode.
2Illumination intensity
If multiple organic light-emitting elements are arranged, then the luminous flux is improved, but the device complexity is increased
Solution Approach 1:
The patent combines multiple sub-elements into a single integrated light-emitting element structure where the sub-elements are arranged in a matrix pattern and electrically connected in series within the same device package. This merging approach simplifies the external electrical connection interface while maintaining the required luminous flux output.
3Illumination intensity
If the area of organic light-emitting element is increased, then the luminous flux is improved, but the voltage drop is increased
Solution Approach 1:
By segmenting the large-area element into smaller sub-elements connected in series, each sub-element's transparent electrode maintains low sheet resistance and minimal voltage drop. The total voltage required is distributed across multiple elements, preventing excessive voltage drop in any single electrode while achieving the required total luminous flux.
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
This approach enables easy electrical connection of multiple organic light-emitting elements in series, improving the efficiency of electrical current management and reducing the complexity of adding or replacing elements, thereby enhancing the stability and longevity of the organic light-emitting elements.
Implementation Method 1
an organic light-emitting element is a self-light-emitting element using electroluminescence, in which light is emitted when an electric current flows in an organic light-emitting compound
Data Source
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AI summary
The present invention relates to an organic light-emitting element comprising a first electrode, a second electrode, and an organic layer interposed between said first electrode and said second electrode, and to a light-emitting device including the same, wherein in the organic light-emitting element, a connection electrode for electrically connecting two or more elements in serial is formed on a non-light-emitting surface of said organic light-emitting element. The invention can electrically connect a plurality of organic light-emitting elements easily, and can be implemented as a large-scale lighting or display device or the like.