LCD Panel Retaining Wall to Protect Bonding Electrodes
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Solution Overview
Problem
The challenge in manufacturing ultra-narrow frame LCDs is the inability to precisely control the flow of the first alignment film, which often results in the film covering the bonding electrode, leading to electrical signal conduction issues and frequent line defects.
Innovation Solution
A retaining wall structure is introduced on the array substrate between the first alignment film and the bonding electrode, restricting the flow of the alignment film material and preventing it from covering the bonding electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the first alignment film is applied without a retaining wall structure, then the film can be formed continuously, but the film flows and covers the bonding electrode causing electrical signal conduction issues
Solution Approach 1:
The patent introduces a retaining wall structure that segments the continuous alignment film formation process into controlled regions. The retaining wall divides the non-display area into a first region (where alignment film is allowed) and a second region (where alignment film is blocked), preventing the film from flowing onto the bonding electrode while maintaining continuous film formation elsewhere.
Solution Approach 2:
The retaining wall structure acts as an intermediary element between the alignment film and the bonding electrode. This intermediate structure physically blocks the alignment film material from reaching the bonding electrode, thereby preventing electrical signal conduction issues without requiring changes to the alignment film or bonding electrode themselves.
2Length of moving object
If the frame width is reduced to achieve ultra-narrow frame LCDs, then the display area is maximized, but the control over alignment film flow becomes difficult leading to line defects
Solution Approach 1:
The retaining wall structure is formed in advance during the manufacturing process, before the alignment film is applied. This preliminary structure pre-establishes the boundaries that will control alignment film flow, ensuring that even in ultra-narrow frame designs where margins are minimal, the alignment film will not flow onto the bonding electrode and cause line defects.
3Ease of manufacture
If the first alignment film flows freely to cover the bonding electrode, then the film formation process is simple, but electrical signal conduction is blocked causing frequent line defects
Solution Approach 1:
The retaining wall serves as an intermediary barrier that allows the alignment film formation process to remain simple and continuous, while simultaneously protecting the bonding electrode from film coverage. The retaining wall is formed from the color film layer or organic light-emitting layer, structures that are already part of the manufacturing process, so no additional complex steps are required.
Data Source
AI summary
The present disclosure relates to the field of display technologies, and discloses a display panel, a preparation method thereof, and a display device; the display panel has a display area and a non-display area adjacent to the display area, and the display panel includes an array substrate, an opposite substrate, and a first alignment film and a retaining wall structure; a bonding electrode is arranged on the array substrate, and located in the non-display area; the opposite substrate and the array substrate are arranged opposite to each other; the first alignment film is arranged on a side of the array substrate close to the opposite substrate; the retaining wall structure is arranged on the side of the array substrate close to the opposite substrate, and at least part of the retaining wall structure is located between the first alignment film and the bonding electrode.