Organic Light-Emitting Device Heat Distribution Layer
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Solution Overview
Problem
In organic light-emitting diodes for automotive applications, achieving both effective heat distribution and moisture barrier functions while maintaining transparency in non-light-emitting surface regions is challenging, as conventional heat spreaders compromise transparency and additional barrier layers increase material and processing costs.
Innovation Solution
An organic light-emitting device with a heat distribution layer comprising a transparent plastics layer and a highly thermally conductive metal layer, arranged in a laminate structure with transparent and non-transparent sub-regions, provides homogeneous heat distribution and an impermeable barrier without compromising transparency, using a transparent bonding layer and encapsulation arrangement for protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a non-transparent aluminum foil heat spreader is adhesively bonded over the light-emitting surface, then heat distribution is improved and moisture barrier function is achieved, but transparency in surface regions is lost
Solution Approach 1:
The heat distribution layer is divided into transparent sub-regions and non-transparent sub-regions. The non-transparent sub-regions (containing metal foil) provide heat distribution and barrier functions, while the transparent sub-regions maintain transparency. This local differentiation allows each region to fulfill its specific function without compromising the overall device performance.
Solution Approach 2:
The heat distribution layer is segmented into multiple functional zones: transparent plastics layers for transparency, metal foil layers for heat distribution and barrier function, and bonding layers for structural integrity. This segmentation allows independent optimization of each sub-layer's properties to resolve the contradiction between heat management and transparency requirements.
2Temperature
If a transparent glass cover with thermally conductive foil is laminated onto the organic light-emitting diode, then heat distribution and transparency are improved, but material and processing costs increase
Solution Approach 1:
The heat distribution layer serves multiple functions simultaneously: heat distribution (via metal foil), moisture barrier (via aluminum foil and plastics layers), and structural protection (via laminate construction). This multi-functionality eliminates the need for separate glass cover and thermally conductive foil layers, thereby reducing material and processing costs while maintaining heat distribution and transparency performance.
Solution Approach 2:
The invention uses a composite laminate structure combining transparent plastics layers (for transparency and flexibility), metal foil layers (for heat distribution and barrier function), and bonding layers (for structural integrity). This composite approach achieves the desired performance at lower cost compared to traditional glass cover solutions.
3Illumination intensity
If patterned heat-distribution foils are set back from the component edge, then transparency in edge regions is achieved, but the moisture barrier function is lost
Solution Approach 1:
The heat distribution layer incorporates transparent sub-regions at the edges (providing transparency) while maintaining non-transparent sub-regions with metal foil (providing moisture barrier). The transparent sub-regions are specifically positioned in edge areas where transparency is desired, while the metal foil extends to provide continuous moisture protection, thus locally optimizing both transparency and barrier functions simultaneously.
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 efficient heat distribution and a hermetic barrier in organic light-emitting devices, maintaining transparency in desired regions and reducing material and processing costs, while ensuring effective moisture protection and uniform brightness.
Implementation Method 1
The heat distribution layer 9 may in particular be provided and configured to distribute heat generated during operation of the organic functional layer stack 3
Implementation Method 2
By recombining holes and electrons, light may be generated in the light-emitting layer by electroluminescence
Implementation Method 3
The heat distribution layer 9 is applied to the layers therebelow by means of a bonding layer 8
Data Source
AI summary
The invention relates to an organic light-emitting component which has an organic functional layer stack (3) having at least one light-emitting layer, which is designed to generate light during operation of the component, a transparent first electrode (2) and a transparent second electrode (4), which are designed to inject charge carriers into the organic functional layer stack (3) during operation, and a heat distribution layer (9), which is applied over the electrodes (2, 4) and the organic functional layer stack (3) and which has at least one plastic layer (10) and a highly heat conductive layer (11), wherein the heat distribution layer (9) has at least one transparent sub-region (91) and at least one non-transparent sub-region (92).