Transparent Organic Lighting Structure for Large-Area Illumination
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Solution Overview
Problem
Semiconductor-based light-emitting diodes are expensive, particularly for large-area applications, and lack flexibility and transparency to visible light, making them unsuitable for cost-effective and versatile lighting solutions in public spaces, furniture, and vehicles.
Innovation Solution
An organic luminous means comprising a substrate with electrodes and an organic layer stack that emits light, where the electrodes and substrate are designed to be transmissive to visible light, allowing for flexible and cost-effective production, and can be integrated into various applications such as glazing, furniture, and vehicle interiors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If semiconductor-based light-emitting diodes are used for large-area applications, then illumination area is increased, but cost increases significantly
Solution Approach 1:
The patent replaces expensive semiconductor-based LEDs with organic light-emitting components that can be manufactured more cost-effectively using solution processing techniques. The organic layers are deposited on flexible substrates using methods like spin-coating or inkjet printing, enabling large-area production at lower costs while maintaining adequate luminous performance for the intended applications
Solution Approach 2:
The invention changes the material parameters from inorganic semiconductor to organic compounds, allowing for different deposition methods and manufacturing processes. This material substitution enables cost-effective large-area fabrication through solution-based techniques rather than requiring expensive semiconductor manufacturing processes
2Reliability
If semiconductor-based light-emitting diodes are used, then stable light emission is achieved, but flexibility and transparency to visible light are lost
Solution Approach 1:
The patent employs flexible substrates such as plastic films or thin glass plates as the base for the organic light-emitting structure. These substrates inherently provide flexibility and can be made transparent in the visible range, allowing the lighting device to conform to curved surfaces or be integrated into applications requiring optical transparency while maintaining structural integrity for stable operation
Solution Approach 2:
The invention uses composite structures combining transparent conductive oxides (like ITO or IZO) with organic light-emitting layers on flexible substrates. This composite approach achieves both electrical conductivity and optical transparency simultaneously, while the organic materials provide flexibility that semiconductor-based LEDs cannot achieve
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 organic luminous means provides a cost-effective, flexible, and transparent lighting solution suitable for diverse applications, including public spaces, furniture, and vehicles, offering variable color impressions and efficient illumination.
Implementation Method 1
an organic layer stack within an active region of the substrate between the first and the second electrode, wherein the organic layer stack comprises at least one organic layer which is suitable for generating light
Data Source
AI summary
An organic luminous means and an illumination device comprising such a luminous means are specified. An optical display apparatus, emergency lighting, motor vehicle interior lighting, an item of furniture, a construction material, a glazing and a display comprising such a luminous means and, respectively, comprising an illumination device having such a luminous means are furthermore specified.