Micro-LED Display Panel Alignment for Narrow-Bezel Bonding
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Solution Overview
Problem
Existing display devices face challenges in accurately bonding the display panel and cover member during manufacturing, leading to assembly defects and increased power consumption, which affects the reliability and lifespan of the device.
Innovation Solution
Incorporating alignment key patterns in the non-display area using a black matrix with openings to expose metal lines, allowing precise alignment between the display panel and cover member, thereby enhancing bonding accuracy and reducing bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bonding alignment key patterns are disposed inside the trimming line in the non-display area, then bonding precision between display panel and cover member is improved, but the area available for pattern formation is limited and assembly defects may occur
Solution Approach 1:
The patent moves the bonding alignment key patterns from inside the trimming line to outside the trimming line in the non-display area. This spatial relocation resolves the contradiction by providing sufficient area for pattern formation while maintaining bonding precision, as the patterns are still accessible during the bonding process.
Solution Approach 2:
The alignment key patterns are formed in advance during the manufacturing process, positioned outside the trimming line. This preliminary positioning enables accurate alignment between the display panel and cover member before final bonding, ensuring precision without constraining the available area.
2Reliability
If additional alignment patterns are added to improve bonding accuracy, then assembly defects are reduced, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent integrates the bonding alignment key patterns into the existing non-display area structure, combining the alignment function with the available space outside the trimming line. This merging approach improves bonding accuracy without adding separate manufacturing steps or increasing device complexity.
Solution Approach 2:
The non-display area serves multiple functions: it provides the bonding alignment key patterns for accurate alignment, maintains the trimming line for manufacturing, and offers space for pattern formation. This multi-functionality reduces overall device complexity while improving bonding accuracy.
3Manufacturing precision
If the non-display area is used for alignment patterns, then bonding precision is improved, but the area for other components or reduced bezel design is reduced
Solution Approach 1:
The patent segments the non-display area into distinct zones: one zone outside the trimming line for bonding alignment key patterns, and other areas for components or reduced bezel design. This segmentation allows both alignment precision and component placement to coexist without conflict.
Data Source
AI summary
The present disclosure is a display device including a micro light-emitting element. The display device includes: a substrate including a display area and a non-display area; a driving circuit disposed on the substrate in the display area; a plurality of light-emitting elements disposed below and above the driving circuit respectively, and electrically connected to the driving circuit; and a plurality of bonding alignment key patterns respectively disposed in corner regions of the non-display area. Thus, a display panel and a cover member are accurately bonded to each other based on the bonding alignment key pattern in a manufacturing process of the display device. Openings in the black matrix further facilitate ambient light or temperature sensing. The arrangement helps reduce bezel size, improve panel reliability, and enhance product durability and power efficiency.