OLED Auxiliary Electrode Design for Voltage Drop Reduction
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Solution Overview
Problem
Conventional OLED displays with a thin film second electrode across the entire substrate experience voltage drops due to electrical resistance, and the removal process of the organic emission layer is complex and energy inefficient.
Innovation Solution
Incorporating an absorption electrode on the auxiliary electrode, made of materials like molybdenum, titanium, or tungsten, which forms a contact hole with the organic emission layer to reduce voltage drops and simplify the removal process by enhancing energy absorption and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a thin film second electrode is formed over the entire area of the substrate, then the luminance deterioration is minimized, but a voltage drop occurs due to electrical resistance
Solution Approach 1:
The electrode system is segmented into a first electrode, an auxiliary electrode, and a second electrode. The auxiliary electrode is positioned between the first and second electrodes to divide the current path, reducing the resistance burden on the second electrode while maintaining full-area coverage for luminance stability.
Solution Approach 2:
The auxiliary electrode acts as an intermediary component between the first electrode and the second electrode. It provides an additional current conduction path, mediating the electrical resistance issue without compromising the luminance uniformity provided by the full-area second electrode.
2Ease of manufacture
If the organic emission layer is removed from the auxiliary electrode, then the contact hole formation is simplified, but the removal process remains complex and energy inefficient
Solution Approach 1:
The absorption electrode is designed with specific material composition and optical parameters (high absorption coefficient at etching wavelength) to change the energy interaction parameters. This enables selective and efficient removal of the organic emission layer through enhanced energy absorption, simplifying the contact hole formation process.
Solution Approach 2:
The absorption electrode uses composite material structure (e.g., Mo/SiO2/Mo or Ti/SiO2/Ti) combining materials with different properties. The metal layers provide electrical conductivity and structural integrity, while the SiO2 layer provides optical absorption characteristics that facilitate efficient organic layer removal with reduced process complexity.
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 minimizes voltage drops across the driving power and simplifies the removal of the organic emission layer, improving energy transmission efficiency and reducing the complexity of the removal process.
Implementation Method 1
simplify the removal process of the organic emission layer on an auxiliary electrode by adding an absorption electrode on the auxiliary electrode
Data Source
AI summary
In an aspect, an organic light emitting diode display including: a substrate; a first electrode and an auxiliary electrode positioned on the substrate and separated from each other; an absorption electrode positioned on the auxiliary electrode; an organic emission layer positioned on the first electrode and having a contact hole exposing the auxiliary electrode and the absorption electrode; and a second electrode positioned on the organic emission layer and connected to the auxiliary electrode and the absorption electrode through the contact hole is provided. In an aspect, the organic light emitting diode (OLED) display may minimize the voltage drop of the driving power passing through the large-sized electrode of the thin film for driving the organic emission layer, and may simplify the removal process of the organic emission layer on the auxiliary electrode by adding the absorption electrode on the auxiliary electrode.