LCD Manufacturing: Integrated Passivation and Case Window
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Solution Overview
Problem
Conventional LCD manufacturing methods result in a passivation layer that increases the thickness and weight of mobile display devices, is prone to breakage from external impacts, and decreases productivity due to additional processing steps.
Innovation Solution
A method involving the sequential stacking of a polarizer, buffer layer, and transparent film on the outside of mother substrates, followed by cutting these assembled units into individual cells, where the polarizer, buffer layer, and transparent film share the same cutting plane, reducing misalignment margins and processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passivation layer is added to protect the LCD panel, then the LCD panel is protected from external impacts, but the thickness and weight of the mobile display device increase
Solution Approach 1:
The patent combines the passivation layer with the case window into a single integrated structure. The case window is designed to serve both as the protective enclosure and as the passivation layer, eliminating the need for a separate passivation layer. This merging reduces the overall thickness and weight while maintaining protection functionality.
Solution Approach 2:
The case window is designed to perform multiple functions simultaneously: it serves as the structural enclosure, the protective passivation layer, and the display area boundary. This multi-functionality eliminates the need for additional dedicated passivation components, thereby reducing weight and thickness.
2Reliability
If a passivation layer is added to protect the LCD panel, then the LCD panel is protected from external impacts, but the productivity decreases due to additional processing steps
Solution Approach 1:
By merging the passivation layer function into the case window structure, the manufacturing process is simplified. The case window can be formed in a single step without requiring separate passivation layer deposition or bonding operations, thereby improving productivity.
Solution Approach 2:
The passivation layer function is extracted from the assembly of separate components and integrated directly into the case window formation process. This eliminates multiple processing steps and reduces manufacturing complexity.
3Manufacturing precision
If the LCD panel is cut into unit cells after assembly, then the misalignment margin is reduced, but the complexity of the manufacturing process increases
Solution Approach 1:
The case window is formed first as a complete assembled unit with all layers (polarizer, buffer layer, transparent film) properly aligned, and only after this preliminary assembly is complete is the cutting into unit cells performed. This preliminary action ensures alignment precision is achieved during assembly rather than requiring post-assembly alignment adjustments.
Data Source
AI summary
A method of fabricating a light weight and small size LCD, and an LCD fabricated by the same. The method of fabricating an LCD includes providing assembled mother substrates, wherein at least one of the mother substrates includes a polarizer, a buffer layer, and a transparent film sequentially stacked on an out-side thereof, and fabricating the assembled mother substrates as individual units by cutting the assembled mother substrates into unit cells.