OLED Transparent Contact Segmentation for Uniform Voltage
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Solution Overview
Problem
Conventional organic light-emitting diodes face issues with uniform voltage distribution due to low transverse conductivity in transparent connection layers, leading to reduced luminance from the edges towards the inner regions of the light-emitting surface.
Innovation Solution
An organic light-emitting diode design featuring a conductive contact structure with a plurality of openings in the first connection layer, allowing electrical connection between the second transparent connection layer and the contact structure, enhancing transverse conductivity and ensuring uniform voltage distribution across the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent connection layer is used to maintain optical transparency, then transparency is improved, but transverse conductivity deteriorates
Solution Approach 1:
The first connection layer is segmented into multiple regions: a central transparent region and surrounding contact regions with openings. This segmentation allows the transparent region to maintain optical transparency while the contact regions provide enhanced electrical conductivity pathways through the openings to the conductive substrate.
Solution Approach 2:
Different regions of the first connection layer are assigned different properties: the central region maintains high transparency for light emission, while the peripheral contact regions incorporate openings that expose conductive substrate to improve transverse conductivity for voltage distribution.
2Device complexity
If voltage is applied to edge areas of connection layers, then electrical connection is simplified, but uniform voltage distribution deteriorates
Solution Approach 1:
The conductive substrate with openings in the first connection layer creates multiple equipotential contact points distributed across the layer. This allows voltage to be distributed more uniformly across the optically active area, reducing the voltage gradient from edges to center that occurs in conventional edge-fed designs.
3Illumination intensity
If transparent connection layers with low transverse conductivity are used, then optical transparency is improved, but luminance uniformity deteriorates
Solution Approach 1:
The connection layer is segmented into transparent emission regions and conductive contact regions with openings. This allows the majority of the surface to remain transparent for uniform light emission while localized contact regions provide improved voltage distribution to maintain luminance uniformity across the display area.
Solution Approach 2:
The first connection layer exhibits local quality variations: central regions optimized for transparency and light emission, while peripheral regions with openings provide enhanced conductivity for voltage distribution, ensuring uniform luminance across the entire optically active area.
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 enables improved electrical connection and uniform emission over the entire surface of the light-emitting diode, maintaining high transparency and conductivity, thus addressing the non-uniformity issues in conventional designs.
Implementation Method 1
the second connection layer is connected electrically with the contact structure in the region of the plurality of openings of the first connection layer
Implementation Method 2
an electrically conductive second connection layer which is at least predominantly transparent to electromagnetic radiation of a characteristic wavelength of the emittable electromagnetic radiation
Implementation Method 3
at least one organic layer for emitting electromagnetic radiation
Data Source
AI summary
An organic light-emitting diode (1), comprising a layer stack (2) for emitting electromagnetic radiation (6). An electrically conductive first connection layer (4) is arranged on a first surface of the layer stack (2) and an electrically conductive second connection layer (5) at least predominantly transparent to a characteristic wavelength of the emittable electromagnetic radiation (6) is arranged on a second surface of the layer stack (2). The organic light-emitting diode is characterized by a conductive contact structure (7) arranged on the opposite side of the first connection layer (4) from the layer stack, which contact structure is connected electrically to the second connection layer (5) in the region of a plurality of openings (12) in the first connection layer (4). Also disclosed is a contact arrangement (15) for a two-dimensional, optically active element and to a method of producing organic light-emitting diodes (1).