Carbon Nanotube Alignment Layer for LCD Fabrication
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Solution Overview
Problem
Conventional methods for making liquid crystal display screens, such as the rubbing method for creating alignment layers, are complex, time-consuming, and prone to electrostatic charges and dust contamination, with a limited lifespan for rubbing cloths and a lengthy baking process for polyimide layers.
Innovation Solution
A method involving the use of a carbon nanotube layer with a fixing layer to create alignment grooves for liquid crystal molecules, where carbon nanotubes are aligned perpendicular to each other on two substrates, eliminating the need for additional groove formation and simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rubbing method is used to create alignment layers, then the liquid crystal molecules can be aligned, but the process becomes complex and time-consuming with electrostatic charges and dust contamination
Solution Approach 1:
The patent extracts and eliminates the rubbing step from the conventional alignment layer fabrication process. Instead of coating polyimide and mechanically rubbing it to create grooves, the invention directly forms grooves on the substrate surface through etching or other direct formation methods, removing the source of electrostatic charges, dust contamination, and process complexity while maintaining the essential alignment function
Solution Approach 2:
The patent replaces the mechanical rubbing action with a non-mechanical groove formation method. Instead of using rubbing cloths that generate electrostatic charges and dust, the invention uses etching processes or direct groove formation techniques that eliminate mechanical contact, thereby resolving the technical contradiction between alignment quality and process complexity/contamination
2Manufacturing precision
If the rubbing method is used to create alignment layers, then the liquid crystal molecules can be aligned, but electrostatic charges and dust contamination occur
Solution Approach 1:
The patent removes the rubbing step that generates electrostatic charges and dust contamination. By directly forming grooves on the substrate without mechanical rubbing, the invention eliminates the harmful factors while preserving the alignment function, thus resolving the contradiction between alignment quality and contamination
Solution Approach 2:
The invention replaces the mechanical rubbing process with a non-mechanical groove formation method such as etching. This substitution eliminates the source of electrostatic charges and dust contamination that are inherent in mechanical rubbing, while still achieving the required liquid crystal molecule alignment
3Manufacturing precision
If polyimide layers are used for alignment layers, then the alignment function is achieved, but a lengthy baking process is required
Solution Approach 1:
The patent extracts and eliminates the polyimide coating and lengthy baking process from the alignment layer fabrication. By directly forming grooves on the substrate surface without applying polyimide layers, the invention removes the time-consuming baking step while maintaining the essential alignment function through the groove structure alone
Solution Approach 2:
The invention replaces the polyimide coating and thermal baking process with a direct groove formation method. This substitution eliminates the lengthy baking time required for polyimide while achieving alignment through the physical groove structure, thus resolving the contradiction between alignment quality and process time
Data Source
AI summary
A method for making a liquid crystal display screen includes the steps of: providing a base comprising a surface; manufacturing a substrate, wherein manufacturing a substrate comprises: placing a carbon nanotube layer on the surface of the base, the carbon nanotube layer comprising a plurality of carbon nanotubes substantially aligned along a same direction; applying a fixing layer on a surface of the carbon nanotube layer, thereby obtaining a first substrate; and supplying a liquid crystal layer, wherein the carbon nanotubes of a first substrate are arranged perpendicular to that of a second substrate.