Alignment Film Coating Barrier Structure for Boundary Precision
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Solution Overview
Problem
The diffusion of alignment liquid during the formation of alignment films in liquid crystal display panels affects the precision of the alignment film boundaries and adjacent areas, leading to issues with adhesive force and displaying quality.
Innovation Solution
A coating method involving the formation of a barrier structure around the alignment liquid coating area using a hardenable molding polymer material, such as α-amino acrylic acid ethyl ester, to prevent the alignment liquid from diffusing outside the designated area, followed by curing to form the alignment film and subsequent removal of the barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment liquid is sprayed in the alignment liquid coating area, then the alignment film is formed, but the alignment liquid diffuses outside the alignment liquid coating area due to gravity
Solution Approach 1:
A barrier structure is introduced as an intermediary element between the alignment liquid coating area and the frame glue coating area. This barrier structure prevents the alignment liquid from diffusing into adjacent areas, thereby maintaining boundary precision while allowing the alignment liquid to be properly applied and cured.
Solution Approach 2:
The barrier structure is formed in advance before the alignment liquid is sprayed. This preliminary action creates a physical constraint that prevents diffusion issues from occurring during the subsequent alignment liquid application and curing process.
2Ease of manufacture
If the alignment liquid is sprayed without barrier structure, then the coating process is simple, but the alignment film boundary becomes wavy and extends onto the frame glue coating area
Solution Approach 1:
The barrier structure serves as a temporary intermediary that simplifies the overall manufacturing process by preventing diffusion issues, thereby eliminating the need for complex post-processing or rework to correct boundary irregularities.
3Manufacturing precision
If barrier structure is formed to prevent diffusion, then alignment film boundary precision is improved, but the process complexity increases
Solution Approach 1:
The barrier structure is designed as a temporary element that is discarded after serving its purpose. It is removed after the alignment liquid is cured and the alignment film is formed, so it does not remain in the final product. This approach minimizes the impact on device complexity.
Solution Approach 2:
The barrier structure is implemented using a disposable material that is inexpensive and easily removable. This allows the barrier to be used temporarily during the coating process without significantly increasing overall process complexity or cost.
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 ensures precise control over the alignment film's boundary and position, preventing it from affecting adjacent areas and improving the adhesive force and displaying quality.
Implementation Method 1
forming a barrier structure in the space between the alignment liquid coating area and the frame glue coating area, and the barrier structure being built closely around the alignment liquid coating area; coating an alignment liquid in the alignment liquid coating area, wherein the barrier structure blocks the alignment liquid to diffuse outside the alignment liquid coating area
Implementation Method 2
curing the alignment liquid to form an alignment film
Implementation Method 3
heating the barrier structure for melting and removing the barrier structure
Implementation Method 4
spraying a solvent on the barrier structure to dissolve the barrier structure in the solvent and remove it
Data Source
AI summary
Provided is a coating method of an alignment film, including: providing a board, having a substrate, the substrate forming an alignment liquid coating area thereon; forming a barrier structure around the alignment liquid coating area; coating an alignment liquid in the alignment liquid coating area, wherein the barrier structure blocks the alignment liquid to diffuse outside the alignment liquid coating area; and curing the alignment liquid to form an alignment film. The present invention may assure that the formed alignment film can not affect other areas adjacent to the alignment liquid coating area.