Auxiliary Electrode Reduces Voltage Drop in OLED Display
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Solution Overview
Problem
Display devices experience voltage drops due to current flow through their wirings, leading to deteriorated display quality, which existing technologies have not adequately addressed.
Innovation Solution
A display device design incorporating a first auxiliary electrode with lower resistivity than the second electrode, positioned not to overlap the light-emitting layer, and additional auxiliary electrodes to reduce voltage drops by improving electrical connections and resistivity, using materials like silver or copper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current flows through the wiring to display an image, then the display device can function, but voltage drop occurs leading to deteriorated display quality
Solution Approach 1:
The patent segments the electrode structure by introducing auxiliary electrodes between the common electrode and the pixel electrode. This segmentation creates multiple parallel current pathways, distributing the current flow to reduce voltage drop in any single pathway while maintaining overall electrical functionality for image display
Solution Approach 2:
The auxiliary electrode acts as an intermediary element between the common electrode and the pixel electrode. It provides additional current distribution points and creates intermediate electrical connections that reduce the resistance and voltage drop in the wiring path, thereby improving display quality without affecting the core electroluminescence function
2Loss of energy
If the second electrode is made with lower resistivity material, then voltage drop is reduced, but device complexity increases due to additional auxiliary electrodes
Solution Approach 1:
The auxiliary electrode is designed to serve multiple functions simultaneously: it acts as an additional current distribution path to reduce voltage drop, serves as a structural support element, and can be integrated with existing electrode fabrication processes. This multi-functionality justifies the increased structural complexity by delivering tangible performance benefits in voltage drop reduction
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 design effectively reduces voltage drops in the display device, enhancing display quality by lowering the resistance of the second electrode and improving electrical connections, thereby minimizing stains caused by voltage drops.
Implementation Method 1
a first auxiliary electrode disposed on the second electrode not to overlap the light-emitting layer, and having a lower resistivity than a resistivity of the second electrode
Implementation Method 2
a light-emitting layer disposed on the first electrode in the opening
Data Source
AI summary
A display device includes a base substrate, a pixel defining film which is disposed on the base substrate and in which an opening is defined, a first electrode disposed on the base substrate and including a first surface facing the base substrate and a second surface opposite to the first surface and exposed in the opening, a light-emitting layer disposed on the first electrode in the opening, a hole transport region disposed between the first electrode and the light-emitting layer, an electron transport region disposed on the light-emitting layer, a second electrode disposed on the electron transport region and disposed extending above the pixel defining film, and a first auxiliary electrode disposed on the second electrode not to overlap the light-emitting layer and having a lower resistivity than a resistivity of the second electrode.