Flexible Printed Circuit Board Layout for Bump Alignment Precision
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Solution Overview
Problem
Existing display devices face challenges in minimizing stretching of circuit boards during thermo-compression bonding, leading to alignment errors between bumps and pads, which affects the reliability and precision of signal transmission.
Innovation Solution
A flexible printed circuit board design with a first bump area and a second bump area, where the first bump area is divided into overlapping portions to distribute stretching, reducing alignment errors by minimizing the stretching of the circuit board during thermo-compression bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the circuit board is made as a single continuous structure for thermo-compression bonding, then the bonding area is sufficient, but stretching occurs during bonding causing alignment errors between bumps and pads
Solution Approach 1:
The first bump area is divided into multiple first divided board portions arranged along the second direction, and the second bump area is divided into multiple second divided board portions. These divided portions are partially overlapped to form a segmented structure that distributes stretching during thermo-compression bonding, thereby minimizing alignment errors between bumps and pads while maintaining sufficient bonding area.
2Manufacturing precision
If the circuit board structure is divided into multiple overlapping portions to minimize stretching, then alignment precision improves, but the device complexity increases
Solution Approach 1:
The circuit board is segmented into multiple divided portions in the bump areas, but these portions are arranged in a regular pattern along the second direction with partial overlap. This segmentation approach achieves alignment precision by distributing stretching while maintaining a relatively simple and systematic structure that does not significantly increase device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively minimizes stretching and alignment errors, enhancing the precision and reliability of signal transmission between the circuit board and the display panel, thereby improving the overall performance of the display device.
Implementation Method 1
stretching of the first circuit board that occurs during thermo-compression bonding
Data Source
AI summary
A flexible printed circuit board and a display device including the same are provided. An embodiment of a display device includes a display panel; a first circuit board attached to a first side of the display panel in a first direction; and a second circuit board attached to a second side of the first circuit board in the first direction, wherein the first circuit board includes a first bump area overlapping the display panel and a second bump area overlapping the second circuit board, the first bump area includes a plurality of first divided board portions arranged along a second direction crossing the first direction, and the first divided board portions of the plurality of first divided board portions partially overlap each other.