Mother Substrate Dummy Resistance Layer Corrosion Protection
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Solution Overview
Problem
In organic light-emitting display apparatus manufacturing, pads connected through test wirings can be isolated and prone to corrosion during the patterning process of the pixel electrode due to the etchant used, leading to potential defects in the display apparatus.
Innovation Solution
A mother substrate design that includes a dummy resistance layer connecting test wirings to pads through bridge wiring, preventing galvanic corrosion by ensuring continuous electrical connection and reducing interference with the electrical signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pads are connected through test wirings using a circuit unit including thin film transistor, then electrical connection is achieved, but pads become substantially isolated and prone to corrosion during patterning process
Solution Approach 1:
A dummy resistance layer is introduced as an intermediary element between the pad and the test wiring circuit unit. This dummy resistance layer serves as a mediator that maintains electrical continuity and provides corrosion protection to the pad during the patterning process, while allowing the circuit unit to function normally for electrical connection purposes.
Solution Approach 2:
The dummy resistance layer is formed in advance before the patterning process occurs. By preliminarily establishing this protective layer that maintains electrical connection, the pad is pre-protected against the harmful effects of etchant exposure during subsequent patterning operations, preventing corrosion before it can occur.
2Ease of operation
If pads are isolated through circuit units, then electrical signal transmission is enabled, but pad corrosion resistance decreases during etching process
Solution Approach 1:
The dummy resistance layer acts as a protective intermediary between the pad and the etchant environment. It maintains the electrical signal transmission pathway while shielding the pad from direct exposure to corrosive etchants, thus preserving pad strength and corrosion resistance during the patterning process.
Solution Approach 2:
The dummy resistance layer provides beforehand cushioning protection to the pad against etchant corrosion. By being in place prior to the patterning process, it cushions the pad from the harmful effects of etching, maintaining both electrical signal transmission capability and structural integrity during the manufacturing process.
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 dummy resistance layer effectively prevents corrosion of pads and bridge wiring during the patterning process, ensuring the integrity of the organic light-emitting display apparatus and facilitating the separation of panel areas without defects.
Implementation Method 1
preventing galvanic corrosion by ensuring continuous electrical connection
Data Source
AI summary
A mother substrate for an organic light-emitting display apparatus. The mother substrate has a panel area and a peripheral area surrounding the panel area, pixels disposed in a display area of the panel area, pads that are disposed in a non-display area of the panel area and are coupled to the pixels, test wirings disposed in the peripheral area, a local buffer electrically connected to the test wirings, a bridge wiring connecting the local buffer to one of the pads, and a dummy resistance layer having one end in contact with the bridge wiring and another end in contact with one of the test wirings.