Printed Circuit Board Multi-Pad Layout for Solder Reliability
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Solution Overview
Problem
Defects such as incomplete electrical connections occur during the soldering process of pads on printed circuit boards in display devices, leading to potential short circuits and other issues.
Innovation Solution
A printed circuit board design featuring a base member with multiple pad portions, including input and output pads arranged in specific diagonal directions, and a connection layer made of metal, such as lead, to enhance electrical connectivity and reduce the likelihood of shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pad configuration is used during soldering, then the manufacturing process is simple, but electrical connection reliability is poor due to defects like incomplete connections and short circuits
Solution Approach 1:
The pad structure is segmented into multiple independent pad portions (first pad portion with first input pad and first output pad, second pad portion with second input pad and second output pad). Each pad portion can be independently connected to the connection layer, providing redundant electrical connection paths. This segmentation allows the system to maintain reliability even if one connection path fails during soldering.
Solution Approach 2:
Different pad portions are positioned at different locations (first pad portion at first location, second pad portion at second location) with different spatial arrangements. The input pads and output pads within each portion are arranged in specific diagonal directions, creating local variations in connection geometry that optimize soldering accessibility and reduce the risk of uniform failure modes.
2Manufacturing precision
If traditional single-pad soldering is used, then the manufacturing process is straightforward, but defects such as incomplete electrical connections occur
Solution Approach 1:
The pad portions are pre-configured with specific geometric arrangements (rectangular, triangular, square, or L-shapes) and positioned at predetermined locations before the soldering process. The input pads and output pads are arranged in specific diagonal directions in advance, allowing the soldering process to simply connect to pre-optimized locations rather than requiring complex real-time alignment, thereby improving connection precision without significantly increasing manufacturing difficulty.
3Reliability
If multiple pad portions are implemented, then electrical connection reliability improves, but the device structure becomes more complex
Solution Approach 1:
Multiple pad portions are merged into a single integrated pad structure that is formed as one unified component on the printed circuit board. The first pad portion and second pad portion share the same base structure and are simultaneously connected to the connection layer through a single soldering operation, reducing the number of separate components and assembly steps despite providing multiple connection paths.
Solution Approach 2:
The pad structure serves multiple functions simultaneously: it provides redundant electrical connection paths, offers different geometric configurations for various connection needs, and enables both input and output signal routing through the same structural framework. This multi-functionality reduces the need for separate specialized components for each function.
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 improves the electrical connection reliability by ensuring each pad portion includes two input and two output pads, reducing defects and enhancing the overall performance of the circuit board.
Implementation Method 1
a connection layer disposed on the base member and including a metal material... the connection layer may be in contact with the first input pad and the first output pad, respectively... the connection layer may be in contact with the second input pad and the second output pad, respectively
Data Source
AI summary
A printed circuit board includes: a base member, a first line and a second line disposed on the base member, and a plurality of pad portions disposed on the base member. Each of the plurality of pad portions includes: a first input pad and a second input pad connected to the first line, respectively, and which receives an electrical signal or voltage. Each of the plurality of pad portions includes a first output pad and a second output pad connected to the second line, respectively, and which provide the electrical signal or the voltage to a display panel.