Dam Pattern Trenches for Narrow Bezel Outgassing Control
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Solution Overview
Problem
In LCDs, the narrow non-display area poses challenges with line arrangement and interference with the display area, leading to issues such as outgassing and reduced reliability due to the limited space and sealing member interference.
Innovation Solution
The implementation of dam patterns with trenches on the surface, including a first dam pattern that does not overlap the sealing member and a second dam pattern that overlaps it, along with an organic layer containing photosensitive materials and a color filter, helps minimize outgassing by controlling the orientation of liquid crystals and preventing overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the non-display area is narrowed to achieve a narrow bezel design, then the aesthetic appearance and modernity of the display device are improved, but the space for arranging signal lines and sealing members is reduced, leading to interference with the display area and outgassing issues
Solution Approach 1:
The patent divides the dam pattern into multiple segments with trenches between them. This segmentation creates separate regions that prevent outgassing from spreading across the entire dam pattern, thereby reducing the outgassing issue while maintaining the narrow non-display area design
Solution Approach 2:
The patent applies different structural characteristics to different parts of the dam pattern by introducing trenches at specific locations. This local modification allows the dam pattern to have both the continuity needed for sealing and the discontinuity needed to prevent outgassing accumulation, resolving the contradiction between narrow bezel and reliability
2Shape
If the non-display area is narrowed to achieve a narrow bezel design, then the aesthetic appearance and modernity of the display device are improved, but the arrangement of signal lines becomes more difficult, increasing the risk of interference with the display area
Solution Approach 1:
The trench structure segments the dam pattern into isolated regions, which simplifies the arrangement of signal lines by creating clear separation zones. This reduces the complexity of routing lines through the narrow non-display area while preventing interference with the display area
3Reliability
If dam patterns are used to prevent liquid crystal overflow, then the sealing performance is improved, but the outgassing issue arises due to the confined space in the narrow non-display area
Solution Approach 1:
The patent introduces trenches at specific locations on the dam pattern surface, creating local variations in the structure. These trenches allow trapped gas to escape from specific points while maintaining the overall sealing function of the dam pattern, thus resolving the contradiction between sealing performance and outgassing prevention
Data Source
AI summary
A display device including a display area and a non-display area disposed outside the display area, the display device including a first display substrate, a second display substrate opposite to the first display substrate, and a sealing member disposed between the first display substrate and the second display substrate in the non-display area and coupling the first display substrate to the second display substrate, in which the first display substrate includes a first substrate and an organic layer disposed on the first substrate, the organic layer includes a plurality of dam patterns disposed in the non-display area, and the dam patterns include a first dam pattern not overlapping the sealing member and having a first trench formed on a surface of the first dam pattern, and a second dam pattern overlapping the sealing member.