Array Substrate Electrode Stack for Oxidation-Resistant Uniformity
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Solution Overview
Problem
Existing display technologies fail to meet users' increasingly demanding requirements for picture quality, particularly in terms of oxidation resistance and uniformity of electrodes, leading to issues like electrode disconnection and poor color cast.
Innovation Solution
A manufacturing method for an array substrate involving the sequential formation of a first electrode material layer, a conductive enhancement material layer, and a protective material layer, where the protective layer has stronger oxidation resistance, and a mask pattern is used to expose the protective layer, allowing for single-mask patterning of the electrode and enhancement layers, thereby protecting the conductive enhancement material during ashing and reducing resistance and improving uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional single-layer electrode structure is used, then the manufacturing process is simple, but the electrode uniformity and oxidation resistance are poor
Solution Approach 1:
The electrode system is segmented into three distinct layers: first electrode material layer (ITO), conductive enhancement material layer (MoNb), and protective material layer (titanium alloy). Each layer serves a specific function - the ITO provides base conductivity, the MoNb enhances conductivity and uniformity, and the titanium alloy layer provides oxidation protection. This segmentation resolves the contradiction by achieving high uniformity and oxidation resistance through specialized layers while maintaining a manageable manufacturing process.
Solution Approach 2:
The patent employs a composite multi-layer structure combining different materials with complementary properties. The ITO/MoNb/titanium alloy combination creates a composite electrode system where each material contributes its strengths - ITO for transparency and base conductivity, MoNb for enhanced conductivity and uniformity, and titanium alloy for oxidation resistance. This composite approach directly addresses the limitation of single-layer electrodes by integrating multiple functional properties in one structure.
2Productivity
If multiple masking processes are used for patterning, then the patterning precision is high, but the production efficiency is low and costs are high
Solution Approach 1:
The patent merges the patterning operations for the first electrode, conductive enhancement layer, and protective layer into a single masking process. The mask pattern is designed with varying thicknesses (first portion and second portion) that enable simultaneous definition of all three layers' patterns in one step. This consolidation maintains patterning precision through careful mask design while dramatically improving productivity by eliminating multiple sequential masking steps and reducing associated costs.
3Reliability
If the conductive enhancement material layer is exposed during ashing, then the mask pattern can be removed completely, but the conductive enhancement material oxidizes and causes electrode disconnection
Solution Approach 1:
The protective material layer (titanium alloy) is formed beforehand to cover and protect the conductive enhancement material layer (MoNb) during the ashing process. This preliminary protective action prevents oxidation of the MoNb layer while the mask pattern is being removed. The protective layer acts as a barrier during the critical ashing step, ensuring the conductive enhancement material remains intact and connected, thus maintaining electrode reliability while still allowing complete mask removal afterward.
4Manufacturing precision
If the first electrode material layer is patterned before forming the conductive enhancement layer, then the process sequence is simple, but the electrode uniformity and conductivity are poor
Solution Approach 1:
The conductive enhancement material layer (MoNb) and protective material layer (titanium alloy) are formed preliminarily on the first electrode material layer (ITO) before final patterning. This sequence allows the conductive enhancement layer to be deposited uniformly across the substrate, improving overall electrode uniformity and conductivity. The protective layer is also formed at this stage to prevent subsequent oxidation. Although this approach increases process sequence complexity compared to simple single-layer patterning, it delivers superior electrode performance that justifies the additional steps.
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 method enhances the production efficiency, reduces production costs, prevents electrode disconnection, and improves the display's color cast by ensuring the conductive enhancement layer's protection and uniformity, addressing the limitations of existing technologies.
Implementation Method 1
oxidation resistance of the protective material layer is stronger than oxidation resistance of the conductive enhancement material layer
Implementation Method 2
performing ashing on the mask pattern to remove the second portion
Data Source
AI summary
The present disclosure relates to a manufacturing method for an array substrate, including: forming a first electrode material layer, a conductive enhancement material layer and a protective material layer in sequence, oxidation resistance of the protective material layer being stronger than that of the conductive enhancement material layer; forming a mask pattern on a side of the protective material layer away from the first electrode material layer, the mask pattern including a first portion and a second portion, and a thickness of the first portion being greater than that of the second portion; performing ashing on the mask pattern to remove the second portion to expose the protective material layer covered by the second portion; patterning the first electrode material layer to form a first electrode; and patterning the protective material layer and the conductive enhancement material layer to form a protective layer and a conductive enhancement layer.