Dam Pattern Structure for LCD Bezel Alignment Film Control
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Solution Overview
Problem
In liquid crystal display (LCD) devices with thin or narrow bezels, the narrow non-display region poses challenges for wire arrangement and interference from the display region, and there is a risk of alignment film overflow during manufacturing, which can reduce adhesion performance.
Innovation Solution
The implementation of a display device with specific dam patterns on the substrate in the non-display region, including a first dam pattern with a stem section and diverging branch sections, and a second dam pattern with a parallel stem section and diverging branch sections, along with an alignment film that overlaps these patterns, helps manage the alignment film and prevent overflow, thereby enhancing adhesion and reducing the bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the non-display region is narrowed to achieve thin bezel, then the bezel size is reduced, but alignment film overflow occurs during manufacturing
Solution Approach 1:
The dam pattern serves as an intermediary structure between the alignment film and the seal pattern. It acts as a mediator that receives the alignment film and prevents it from overflowing onto the seal pattern, while still allowing the bezel to remain thin. The dam pattern is formed in the non-display region and has a specific structure with a stem section and branch sections that control film flow.
2Length of stationary object
If the non-display region is narrowed to achieve thin bezel, then the bezel size is reduced, but adhesion performance between substrates deteriorates
Solution Approach 1:
The dam pattern acts as a protective intermediary that prevents alignment film from reaching the seal pattern. By blocking the alignment film from overflowing onto the seal pattern, the dam pattern preserves the adhesion performance of the seal pattern, which is critical for bonding the first and second substrates together, even in thin bezel configurations.
3Manufacturing precision
If dam pattern is added to prevent alignment film overflow, then alignment film overflow is prevented, but device complexity increases
Solution Approach 1:
The dam pattern is segmented into distinct functional sections: a stem section that extends from the first substrate and branch sections that diverge to form a containment structure. This segmentation allows the dam pattern to effectively trap the alignment film while maintaining a relatively simple overall structure that can be integrated into the existing manufacturing process.
Data Source
AI summary
A display device includes a first substrate, on which a display region and a non-display region disposed outside the display region are defined; a first dam pattern and a second dam pattern, which are disposed on the first substrate in the non-display region. The first dam pattern includes a first stem section extending in a predetermined direction, and a first branch section and a second branch section extending to diverge from the first stem section, and the second dam pattern includes a second stem section disposed parallel to the first stem section, and a third branch section extending to diverge from the second stem section and facing the second branch section.