OLED Cathode Contact Unit Heat Distribution
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Solution Overview
Problem
In organic light-emitting display apparatuses, poor contact between the source/drain electrode-forming material and the pixel-defining layer leads to inadequate heat generation and concentration of heat at the periphery of the cathode contact unit, affecting the apparatus's performance and reliability.
Innovation Solution
The solution involves a cathode contact unit with a cathode bus line formed on the same layer as the pixel electrode, a first auxiliary electrode along the edge of the cathode bus line, and a second auxiliary electrode that contacts the first auxiliary electrode, improving electrical connections and reducing heat concentration by distributing heat more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cathode contact unit uses a simple structure where source/drain electrode-forming material contacts the cathode electrode, then the device complexity is reduced, but poor contact occurs between the source/drain electrode-forming material and the pixel-defining layer, leading to heat concentration and reliability issues
Solution Approach 1:
The cathode contact unit is segmented into multiple functional components: cathode bus line, first auxiliary electrode, second auxiliary electrode, and pixel-defining layer with contact holes. This segmentation allows each component to perform its specific function optimally, improving overall contact quality and heat distribution while maintaining reasonable device complexity
Solution Approach 2:
The pixel-defining layer acts as an intermediary between the cathode bus line and the cathode electrode, providing proper contact holes that ensure good electrical contact. The auxiliary electrodes serve as intermediaries to distribute current and heat evenly, preventing direct concentration of heat at single contact points
2Ease of manufacture
If heat is concentrated at the periphery area of the cathode contact unit, then the manufacturing process is simpler, but the reliability and performance of the display apparatus deteriorate due to poor heat management
Solution Approach 1:
The cathode contact unit structure provides different local qualities: the cathode bus line provides current path, the auxiliary electrodes provide heat dissipation paths at specific locations, and the pixel-defining layer provides controlled contact areas. This local differentiation ensures heat is managed appropriately at each location rather than being uniformly concentrated
Solution Approach 2:
The multiple auxiliary electrodes create dynamic heat distribution paths that adapt to the current flow patterns, allowing heat to be dissipated through multiple routes rather than following a single static path, thereby improving overall heat management effectiveness
3Reliability
If auxiliary electrodes are added to the cathode contact unit, then electrical resistance is reduced and brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The first and second auxiliary electrodes are merged with the cathode bus line structure, forming an integrated cathode contact unit. This merging reduces the need for separate manufacturing processes and simplifies the overall structure while still providing the electrical resistance reduction and brightness uniformity improvements through the auxiliary electrode functionality
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 configuration enhances heat management, reduces electrical resistance, increases brightness uniformity, and decreases power consumption, enabling larger and higher-resolution displays with improved product quality.
Implementation Method 1
a cathode bus line which is formed on the same layer as the pixel electrode and contacts the cathode electrode, a first auxiliary electrode which is formed on the cathode bus line along an edge area of the cathode bus line, and a second auxiliary electrode which contacts the first auxiliary electrode
Implementation Method 2
an organic light-emitting device in which a pixel electrode, an intermediate layer including an emissive layer, and a cathode electrode are sequentially stacked
Data Source
AI summary
An organic light-emitting display apparatus and a method of manufacturing the same. The organic light-emitting display apparatus includes an organic light-emitting device in which a pixel electrode, an intermediate layer that includes an emissive layer, and a cathode electrode are sequentially stacked. The cathode contact unit includes a cathode bus line that is formed on the same layer as the pixel electrode and contacts the cathode electrode, a first auxiliary electrode that is formed on the cathode bus line along an edge area of the cathode bus line, and a second auxiliary electrode that contacts the first auxiliary electrode.