Multi-Model Glass Substrate Gate Pad Corrosion Prevention
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Solution Overview
Problem
In liquid crystal display (LCD) devices, the gate pad electrodes in sub model cells are prone to corrosion due to exposure to the atmosphere for extended periods, leading to signal delays and reduced productivity and utility of multi model glass (MMG) type substrates.
Innovation Solution
The use of a double-layered metal structure for gate lines, gate link lines, and gate pad electrodes, with a corrosion-resistant top layer of molybdenum (Mo) and a lower layer of aluminum (Al) or its alloy, and connecting the gate pad electrode terminal to the side portion of the Mo layer to prevent atmospheric infiltration, effectively preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer metal structure is used for gate pad electrodes in sub model cells, then the fabrication process is simple, but the gate pad electrodes are prone to corrosion due to extended exposure to atmosphere
Solution Approach 1:
The gate pad electrode is constructed as a composite structure with a Mo layer (first metal layer) and an Al or Al alloy layer (second metal layer). The Mo layer provides corrosion resistance while the Al layer provides good electrical conductivity and ease of connection. This composite material approach resolves the contradiction by combining materials with complementary properties to achieve both reliability and ease of manufacture.
2Productivity
If gate pad electrodes are exposed to atmosphere for extended periods, then productivity is reduced, but connection to external circuits is enabled
Solution Approach 1:
The Mo layer is formed as the top layer of the gate pad electrode structure before the cells are exposed to atmosphere. This preliminary protective action prevents corrosion from occurring during extended exposure periods, allowing the gate pad electrodes to maintain their integrity and functionality throughout the fabrication process and subsequent handling.
3Stability of the object's composition
If corrosion occurs in the gate pad region, then signal delays occur, but the structure remains intact
Solution Approach 1:
The dual-layer metal structure with Mo and Al/Al alloy maintains structural integrity while ensuring signal quality. The Mo layer prevents corrosion that would cause signal delays, while the Al layer maintains good electrical conductivity. This composite approach ensures both structural stability and signal integrity are maintained simultaneously.
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 solution significantly reduces corrosion in the gate pad region, enhancing the durability and productivity of MMG type substrates by preventing signal delays and improving image quality.
Implementation Method 1
a corrosion-resistant top layer of molybdenum (Mo) and a lower layer of aluminum (Al) or its alloy
Data Source
AI summary
A liquid crystal display device includes a first array cell having a first active region and a first pad region in a periphery of the first active region, wherein the first array cell includes a first gate line including first and second metal layers, a first data line crossing the first gate line to define a pixel region, a first switching device being near a crossing of the first gate line and the first data line and connected to the first gate line and the first data line, a first pixel electrode connected to the first switching device, a first gate pad electrode in the first pad region, a first gate link line extending from the first gate pad electrode and connected to the first gate line using a connection pattern; and a second array cell larger than the first array cell.