Flexible PCB Bridging Layout for Foldable Touch Display Connections
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Solution Overview
Problem
Existing touch-control display apparatuses face challenges in efficiently connecting the touch panel and display panel through flexible printed circuit boards, particularly in achieving reliable and stable signal transmission while accommodating flexible and foldable designs.
Innovation Solution
A flexible printed circuit board design incorporating a main flexible board and a bridging flexible board, with specific solder joint arrangements and auxiliary lines, ensures robust signal connections and flexibility, allowing for foldable displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible printed circuit board is used to connect the touch panel and display panel, then flexibility and foldability are improved, but connection reliability and signal transmission stability deteriorate
Solution Approach 1:
The flexible printed circuit board is divided into multiple independent solder joints (at least two first solder joints and at least two second solder joints) instead of using a single connection point. This segmentation allows the connection to be distributed across multiple points, maintaining flexibility while improving overall connection reliability through redundancy.
Solution Approach 2:
The patent implements redundant solder joint connections as a preventive measure against connection failures. By establishing multiple solder joints before any potential failure occurs, the system cushions against reliability issues that might arise from flexibility-induced stress or damage during folding operations.
2Reliability
If multiple solder joints are used to improve connection reliability, then signal transmission stability is improved, but device complexity increases
Solution Approach 1:
The auxiliary signal lines serve multiple functions: they provide redundant signal transmission paths, enable alternative routing when primary paths fail, and maintain signal integrity across the flexible board. This multi-functionality justifies the additional complexity by delivering enhanced reliability and stability.
Solution Approach 2:
The patent changes the parameter of connection multiplicity from single to multiple solder joints per pad. This parameter change increases signal transmission stability by providing redundant paths, while the complexity increase is managed through systematic arrangement of the additional connections.
3Reliability
If auxiliary signal lines are added to provide redundant paths, then connection reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The auxiliary signal lines are pre-configured and positioned during the circuit board design and manufacturing phase, before actual assembly and soldering. This preliminary action allows the redundant paths to be integrated into the manufacturing process itself, reducing the complexity of subsequent assembly operations.
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 solution provides reliable signal transmission and flexibility, supporting foldable displays by enhancing the connectivity and durability of the touch-control display apparatus.
Implementation Method 1
The first solder joint is connected with the third solder joint by solder, and the second solder joint is connected with the fourth solder joint by solder
Data Source
AI summary
A flexible printed circuit board includes a main flexible board and a bridging flexible board, wherein the main flexible board includes a first main pad, a second main pad, a first signal line and a second signal line, and the bridging flexible board includes a first bridging pad and a second bridging pad; the first main pad includes at least two first solder joints, the second main pad includes at least two second solder joints, the first bridging pad includes at least two third solder joints, and the second bridging pad includes at least two fourth solder joints.