Sealing Material Grooves for Liquid Crystal Display Adhesion
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Solution Overview
Problem
In liquid crystal display devices, the adhesion between the sealing material and the alignment film is poor, especially in miniaturized fringe portions, leading to reduced adhesion intensity and manufacturing challenges.
Innovation Solution
The display device incorporates an array substrate with a first alignment film and a counter substrate with a second alignment film, where the sealing material is designed to increase the adhered area by forming grooves or convex portions on the substrates, enhancing the adhesion and peel strength between the alignment films and the sealing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the alignment film is applied to the whole surface of the substrate, then the design and process control becomes easier for miniaturization, but the adhesion intensity between the sealing material and the alignment film is further deteriorated
Solution Approach 1:
The sealing material is divided into a first sealing portion and a second sealing portion with different structures. The first sealing portion has a flat bottom surface for standard sealing, while the second sealing portion has a protruding structure that extends into the liquid crystal layer to increase adhesion area and improve peeling resistance specifically in regions where alignment films meet
Solution Approach 2:
The sealing material transitions from a two-dimensional flat structure to a three-dimensional structure with protrusions extending into the liquid crystal layer. This vertical dimensionality increase creates additional adhesion interfaces between the sealing material and alignment films, significantly improving peeling strength without affecting the horizontal miniaturization design
2Strength
If the alignment film is not formed in the sealing area, then the adhesion problem between sealing material and alignment film is avoided, but the alignment film cannot be applied to the whole surface of the substrate making design and process control hard
Solution Approach 1:
The sealing material is segmented into different functional portions: the first sealing portion provides standard sealing function, while the second sealing portion with protrusions specifically addresses the adhesion challenge at alignment film interfaces, allowing continuous alignment film coverage throughout the substrate
Solution Approach 2:
The sealing material exhibits different structural qualities in different regions. The protruding second sealing portion is strategically positioned where alignment films meet to provide enhanced adhesion locally, while other regions maintain standard sealing characteristics, enabling both continuous alignment film application and improved adhesion
Data Source
AI summary
When an alignment film is applied to the whole surface of a substrate, adhesion intensity between a sealing material and the alignment film is further deteriorated. A display device includes an array substrate having a first alignment film, a counter substrate having a second alignment film, a liquid crystal layer in contact with the first alignment film and the second alignment film, and a sealing material for bonding the first alignment film and the second alignment film together, wherein the sealing material is provided with a portion adapted to increase the area of the adhered portion.