OLED Mirror Layer Lateral Thermal Conductance
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Solution Overview
Problem
Large-area organic light-emitting diodes (OLEDs) experience uneven temperature and luminance distribution, leading to unattractive images and accelerated aging, as well as color shift issues due to microcavity effects, which current technologies inadequately address through lack of effective heat dissipation and color compensation methods.
Innovation Solution
A light-emitting component design incorporating a mirror layer structure with a lateral thermal conductance of at least 1*10−3 W/K, combined with an optically translucent layer, to improve heat distribution and reduce color angle distortion, featuring a mirror layer structure on or over the second electrode, optionally with light-scattering particles, and an encapsulation layer for enhanced thermal conductivity and optical coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED design with busbars is used, then current distribution is improved, but lateral temperature distribution remains insufficient
Solution Approach 1:
The patent applies a multilayer metal structure (comprising aluminum and silver layers) that simultaneously serves as both a current distribution layer and a heat dissipation layer. This multi-functional design allows the same structural element to address both electrical and thermal uniformity issues in the OLED, eliminating the need for separate busbar structures while improving lateral temperature distribution.
Solution Approach 2:
The patent employs a composite metal layer structure combining aluminum and silver with specific thickness ratios. This composite material approach leverages the high electrical conductivity of aluminum and the high thermal conductivity of silver to achieve both uniform current distribution and effective lateral heat dissipation across the OLED surface.
2Reliability
If scattering films or foils are applied to combat color angle distortion, then color uniformity is improved, but device complexity increases
Solution Approach 1:
The patent integrates a translucent layer into the OLED structure that simultaneously serves as an optical element for color angle distortion compensation and as a structural component of the device. This multi-functional design achieves color uniformity across viewing angles without adding separate scattering films or foils, thereby avoiding increased device complexity.
Solution Approach 2:
The patent merges the optical compensation function with the existing device structure by incorporating the translucent layer as part of the encapsulation or substrate system. This integration approach combines multiple functions (structural support, encapsulation, and color angle compensation) into a single layer, reducing overall device complexity while maintaining color uniformity.
3Reliability
If remote cavity with semitransparent top contact and mirror is used, then color angle distortion is reduced, but thermal management is insufficient
Solution Approach 1:
The patent employs a multilayer metal structure that simultaneously provides electrical connectivity, thermal management, and optical reflection functions. This multi-functional layer serves as part of the remote cavity structure for color angle compensation while also acting as an efficient heat dissipation pathway, addressing both optical and thermal requirements without separate components.
Solution Approach 2:
The patent uses a composite metal structure combining aluminum and silver layers with optimized thickness ratios. This composite material provides high thermal conductivity for effective heat dissipation while maintaining the optical reflection properties needed for the remote cavity effect, thereby simultaneously addressing thermal management and color angle distortion issues.
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 achieves improved uniformity in temperature distribution and reduced color shift, thereby enhancing the homogeneity of the luminous image and extending the lifetime of OLEDs while maintaining optical transparency and efficiency.
Implementation Method 1
the mirror layer structure has a lateral thermal conductance of at least 1*10−3 W/K
Implementation Method 2
an optically translucent layer structure on or over the second electrode
Implementation Method 3
a mirror layer structure on or over the second electrode
Data Source
AI summary
A light-emitting component may include: a first electrode; an organic electroluminescent layer structure on or over the first electrode; a second translucent electrode on or over the organic electroluminescent layer structure; and a mirror layer structure on or over the second electrode, wherein the mirror layer structure has a lateral thermal conductance of at least 1*10−3 W/K.