Silver-Molybdenum Alloy Electrodes for Reflective LCD Hillock Prevention
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Solution Overview
Problem
Aluminum electrodes in reflective and reflective-transmissive LCD devices are prone to hillock formation and galvanic corrosion, increasing manufacturing costs due to the need for additional corrosion-proof layers.
Innovation Solution
A silver-molybdenum alloy electrode is used, which is electrically connected to the output terminal of a signal-applying module on a display substrate, eliminating hillock formation and corrosion issues while maintaining high reflectivity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If aluminum or aluminum alloy is used as reflective electrode, then high reflectivity is achieved, but hillock formation and galvanic corrosion occur
Solution Approach 1:
The patent uses a composite structure consisting of a corrosion-proof layer (first protective layer) and a reflective layer (second protective layer). This composite material approach allows the device to simultaneously achieve high reflectivity and corrosion resistance by combining materials with complementary properties, eliminating the need for a single material to perform both functions alone.
Solution Approach 2:
The corrosion-proof layer serves as an intermediary between the reflective layer and the external environment. This intermediate protective layer prevents direct contact between the reflective electrode and corrosive substances, thereby preventing galvanic corrosion while maintaining the high reflectivity of the reflective layer underneath.
2Reliability
If corrosion-proof layer is added to prevent galvanic corrosion, then corrosion resistance is improved, but manufacturing steps and costs increase
Solution Approach 1:
The patent merges the corrosion-proof function and reflective function into a single integrated structure where the corrosion-proof layer is formed as part of the electrode fabrication process. By combining these functions rather than adding separate independent layers, the manufacturing complexity is minimized while still achieving both corrosion resistance and high reflectivity.
Solution Approach 2:
The patent specifies precise thickness parameters for the corrosion-proof layer (50-200 nm) and reflective layer (50-200 nm) to optimize both corrosion resistance and reflectivity. By carefully controlling these dimensional parameters, the invention achieves effective protection with minimal material usage, reducing manufacturing complexity and cost.
3Reliability
If aluminum film is used for electrode fabrication, then low resistivity and high adhesion are achieved, but thermal expansion mismatch causes stress and hillock formation
Solution Approach 1:
The patent changes the material composition parameters by replacing pure aluminum with a composite structure of corrosion-proof layer and reflective layer. This parameter change in material composition allows the electrode to maintain low resistivity and high adhesion while eliminating the thermal expansion mismatch problems associated with pure aluminum films.
Solution Approach 2:
The invention uses composite materials with different thermal expansion coefficients to create a structure that is stable under thermal stress. The composite structure of corrosion-proof layer and reflective layer provides both electrical conductivity and dimensional stability, preventing hillock formation while maintaining low resistivity.
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 silver-molybdenum alloy electrode enhances image display quality by reducing hillock formation and corrosion, improving optical reflectivity and adhesion without increasing manufacturing steps, thus lowering costs.
Implementation Method 1
The reflective type LCD device displays an image using light externally provided (e.g., from the sun, a lamp, or other illuminating device)... the reflective electrode that has a greater reflectivity than a transparent electrode
Data Source
AI summary
A display device includes silver-molybdenum alloy electrodes having high reflectivity despite annealing temperatures. The display may have a first display substrate, a second display substrate and a liquid crystal layer. The first display substrate includes signal-applying modules (e.g., TFTs) disposed on a first substrate each including an output terminal configured to output a data signal, a patterned insulation layer having contact holes that expose the output terminals, and silver-molybdenum alloy electrodes (made of silver and molybdenum) electrically connected to the output terminals. The silver-molybdenum alloy electrode is employed in the display device, thereby increasing reflectivity of the display device and improving display quality of an image displayed by the display device.