Flexible PCB Protrusion Layout for Precise Display Pad Bonding
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Solution Overview
Problem
Existing display devices face challenges in achieving precise bonding between electronic components due to manufacturing errors and thermal expansion, leading to unreliable electrical connections.
Innovation Solution
A flexible printed circuit board design with protrusions and alignment marks, allowing for precise alignment and connection of pads, enhancing bonding precision and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bonding processes are used to join pads of electronic components, then the manufacturing process is simple, but bonding precision deteriorates due to manufacturing errors and thermal expansion
Solution Approach 1:
The flexible printed circuit board is divided into multiple protrusions (first protrusion, second protrusion, etc.) with connection pads disposed on each. This segmentation allows independent alignment and bonding of each protrusion to corresponding panel pads, improving overall bonding precision while managing complexity through modular structure
Solution Approach 2:
Alignment marks are disposed on the protrusions before the bonding process. These pre-positioned marks enable precise alignment between the flexible printed circuit board and display panel prior to bonding, ensuring accurate pad-to-pad correspondence and improving bonding precision
2Manufacturing precision
If multiple protrusions with connection pads are used to improve bonding precision, then bonding precision improves, but device complexity increases
Solution Approach 1:
Multiple protrusions serve dual functions: they provide mechanical support/structural stability and simultaneously serve as bonding interfaces for electrical connections. This multi-functionality improves bonding precision without proportionally increasing device complexity
Solution Approach 2:
Connection pads are selectively disposed only on the protrusions that require bonding to panel pads. This localized placement of functional elements improves bonding precision at critical interfaces while minimizing unnecessary structural complexity in non-critical areas
Data Source
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AI summary
A display device includes a display panel, which includes a plurality of panel pads arranged along a first direction, and a flexible printed circuit board. The flexible printed circuit board includes a base portion, a first protrusion protruding in a second direction intersecting a first direction from one side of the base portion extending in the first direction, a second protrusion protruding in the second direction from the one side of the base portion and spaced apart from the first protrusion in the first direction, first connection pads disposed on the first protrusion, and second connection pads disposed on the second protrusion. At least some of the first connection pads extend in a direction inclined with respect to the first direction and the second direction, and at least some of the second connection pads extend in a direction inclined with respect to the first direction and the second direction.