Flexible PCB Protrusion Layout for Precise Display Pad Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in achieving precise bonding between electronic components due to manufacturing errors and thermal expansion/contraction, 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 connect pads of electronic components, then the manufacturing process is simple, but bonding precision deteriorates due to manufacturing errors and thermal expansion/contraction
Solution Approach 1:
The flexible printed circuit board is divided into multiple protrusions (first protrusion, second protrusion, etc.), each containing connection pads. This segmentation allows independent alignment and bonding of each protrusion to corresponding panel pads, improving bonding precision by breaking down the complex bonding process into smaller, more controllable units.
Solution Approach 2:
Alignment marks are disposed on each protrusion before the bonding process. These alignment marks enable preliminary alignment between the flexible printed circuit board and the display panel, compensating for manufacturing errors and thermal expansion/contraction that occur during bonding, thereby improving bonding precision.
2Manufacturing precision
If alignment marks and multiple protrusions are added to improve bonding precision, then bonding precision improves, but device complexity increases
Solution Approach 1:
The protrusions serve multiple functions: they provide structural support for the connection pads, act as alignment references through the disposed alignment marks, and enable thermal expansion/contraction compensation during bonding. This multi-functionality reduces the need for separate alignment features, thereby limiting the increase in device complexity while improving bonding precision.
3Reliability
If connection pads are arranged in multiple protrusions for precise alignment, then electrical connection reliability improves, but manufacturing complexity increases
Solution Approach 1:
The alignment marks on the protrusions enable self-alignment between the flexible printed circuit board and the display panel during bonding. This self-service alignment mechanism reduces the need for complex external alignment equipment and processes, thereby improving electrical connection reliability while limiting the increase in manufacturing complexity.
Data Source
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.