OLED Second Electrode Voltage Drop Reduction via Auxiliary Metal Layer
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Solution Overview
Problem
In organic light-emitting display devices, the high resistivity of the second electrode leads to voltage drops far away from the applied voltage location, degrading display quality, and the thinness required for top-emission designs makes it challenging to connect the second electrode effectively with an auxiliary electrode.
Innovation Solution
An organic light-emitting display device with an auxiliary electrode connected to the second electrode through a metal layer, where the auxiliary electrode is shaped like an inverted trapezoid and formed of a material with lower resistivity, improving electrical connection and reducing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the second electrode is formed thin to enhance light transmittance, then light transmittance is improved, but electrical connection to the auxiliary electrode becomes difficult
Solution Approach 1:
A metal layer is introduced as an intermediary component between the thin second electrode and the auxiliary electrode. This metal layer serves as a mediator that facilitates reliable electrical connection while allowing the second electrode to remain thin for optimal light transmittance. The metal layer bridges the gap created by the thinness of the second electrode, enabling effective electrical connection without compromising optical performance.
2Illumination intensity
If the second electrode is formed of transparent conductive material to enable top emission, then light transmittance is improved, but resistivity increases causing voltage drop
Solution Approach 1:
The electrical conduction function is segmented between two components: the thin transparent second electrode maintains light transmittance, while the auxiliary electrode with lower resistivity handles the electrical conduction to minimize voltage drop. This segmentation allows each component to optimize its primary function without compromise.
Solution Approach 2:
The system uses a composite structure combining the transparent conductive material of the second electrode with the low-resistivity metal of the auxiliary electrode and metal layer. This composite approach leverages the optical properties of transparent conductive materials and the electrical properties of metals to simultaneously achieve high light transmittance and low voltage drop.
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
Enhances display quality by reducing voltage drops across the second electrode, ensuring consistent voltage distribution and improved light transmittance.
Implementation Method 1
a metal layer disposed adjacent to the auxiliary electrode and connected to the auxiliary electrode and the second electrode
Data Source
AI summary
Provided is an organic light-emitting display device comprising a substrate, an insulating layer disposed on the substrate, a first electrode disposed on the insulating layer, an organic layer disposed on the first electrode, a second electrode disposed on the organic layer, an auxiliary electrode disposed on the insulating layer and a metal layer disposed adjacent to the auxiliary electrode and connected to the auxiliary electrode and the second electrode.