Pad Electrode Layout With Dummy Electrodes Against Ion Migration
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Solution Overview
Problem
Display devices with light emitting diodes (LEDs) experience short circuits due to ion migration between adjacent pad electrodes in high temperature and high humidity environments, caused by large voltage differences between supplied signals, leading to metal ion stacking and compound formation.
Innovation Solution
A display device design featuring a substrate with a display area and non-display area, including a first and second pad electrode group separated by dummy electrodes, with different voltages applied to each group to minimize ion migration and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pad electrodes are disposed close to each other to reduce device area, then the device area is reduced, but ion migration occurs easily between adjacent pad electrodes in high temperature and high humidity environments
Solution Approach 1:
A dummy electrode is introduced as an intermediary element between the first and second pad electrodes. This dummy electrode acts as a barrier that prevents direct ion migration between the adjacent pad electrodes while maintaining the compact layout. The dummy electrode is filled with insulating material to ensure electrical isolation and prevent short circuits.
Solution Approach 2:
The pad electrode region is segmented into distinct zones: a first pad electrode group, a second pad electrode group, and an intermediate dummy electrode region. This segmentation creates physical separation between adjacent pad electrodes, reducing the risk of ion migration while preserving the overall compact structure.
2Adaptability or versatility
If different voltages are applied to adjacent pad electrodes to enable signal transmission, then signal transmission is enabled, but large voltage differences cause ion migration and metal ion stacking
Solution Approach 1:
The dummy electrode serves as a voltage buffer and intermediary between pad electrodes with different voltage levels. By introducing this intermediate structure filled with insulating material, the patent reduces the direct impact of large voltage differences on ion migration while still allowing necessary signal transmission between adjacent electrodes.
3Device complexity
If pad electrodes are disposed close to each other to simplify circuit connection, then circuit connection is simplified, but metal ions stack between electrodes forming conductive compounds that cause short circuits
Solution Approach 1:
The dummy electrode acts as a protective intermediary that prevents metal ion stacking between adjacent pad electrodes. The insulating material filled in the dummy electrode region creates a physical and electrical barrier that blocks ion migration pathways, thereby preventing short circuit formation while maintaining simple circuit connections.
Solution Approach 2:
The dummy electrode is pre-configured with insulating material to provide beforehand protection against ion migration and metal ion stacking. This preventive measure is built into the structure during manufacturing, creating a cushioning effect that protects against future ion migration even under harsh environmental conditions.
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
Prevents short circuits by increasing the distance between pad electrode groups and stabilizing voltage transmission, ensuring reliable operation even in harsh environmental conditions.
Implementation Method 1
ion migration may occur between adjacent pad electrodes. Specifically, when two different signals are supplied to two adjacent pad electrodes and a voltage difference between two supplied signals is large, metal ions may move from one pad electrode to the other pad electrode.
Data Source
AI summary
A display device is provided, a first pad electrode group including a plurality of first pad electrodes, a second pad electrode group including a plurality of second pad electrodes, and a plurality of first dummy electrodes disposed between the first pad electrode group and the second pad electrode group, wherein a first voltage is applied to the plurality of first pad electrodes, and a second voltage different from the first voltage is applied to the plurality of second pad electrodes.