Flexible Printed Circuit Board Segmentation and Shielding
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Solution Overview
Problem
Existing flexible printed circuit boards for OLED touch displays are complex to manufacture and costly due to their multi-layer structure, which complicates the manufacturing process and increases production expenses.
Innovation Solution
A flexible printed circuit board design comprising a main single- or double-layer board and an adaptor board with distinct outlines, connected through specific regions and signal lines, incorporating an electromagnetic shielding structure in overlapping regions to simplify the manufacturing process and reduce costs, while maintaining effective signal interference shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-layer flexible printed circuit board is used to realize circuit connection with PCB, then the display device can achieve simultaneous control of touch and display, but the manufacturing difficulty increases and cost increases
Solution Approach 1:
The flexible printed circuit board is divided into a main FPC board and an adaptor FPC board, each with single- or double-layer structures. The main board handles display control while the adaptor board handles touch control, enabling simultaneous control functionality. This segmentation allows each board to be manufactured separately with simpler processes, reducing overall manufacturing difficulty while maintaining full control capability.
2Adaptability or versatility
If a multi-layer flexible printed circuit board is used to realize circuit connection with PCB, then the display device can achieve simultaneous control of touch and display, but the cost increases
Solution Approach 1:
The FPC system is segmented into main and adaptor boards with simpler single- or double-layer structures instead of complex multi-layer construction. This reduces material costs, manufacturing complexity, and production expenses while preserving the ability to simultaneously control both touch and display functions through distributed circuit arrangements.
3Device complexity
If signal lines are arranged on single- or double-layer boards with different outlines, then manufacturing complexity is reduced, but electromagnetic interference between signal lines may increase
Solution Approach 1:
An electromagnetic shielding structure is introduced as an intermediary element between the first signal line and the third signal line in the overlapping region. This shielding structure blocks electromagnetic interference while allowing the signal lines to maintain their simplified single- or double-layer configurations with different board outlines, thus preserving manufacturing simplicity while eliminating EMI risks.
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 simplified design reduces manufacturing complexity and costs by using single- or double-layer boards, enhancing the performance of the flexible printed circuit board through electromagnetic shielding, thereby improving the overall efficiency and usability of the circuit board.
Implementation Method 1
an electromagnetic shielding structure is at least disposed on a side of the main flexible printed circuit board facing the adaptor flexible printed circuit board or on a side of the adaptor flexible printed circuit board facing the main flexible printed circuit board
Data Source
AI summary
Provided are a flexible printed circuit board and a display device. The flexible printed circuit board comprises a main flexible printed circuit board and a connection flexible printed circuit board having different outlines. Both printed circuit boards are single-layer boards or double-layer boards. The main flexible printed circuit board comprises a bonding region, a device mounting region, a first connection region and signal lines. The signal lines include a first signal line positioned between the device mounting region and the first connection region, and a second signal line positioned between the device mounting region and the bonding region. The connection flexible printed circuit board comprises a second connection region, a third connection region and a third signal line positioned between the second connection region and the third connection region. The two flexible printed circuit boards are connected by means of the first connection region and the second connection region. An orthographic projection of the third signal line on the main flexible printed circuit board overlaps with the second signal line. In an overlapping region, an electromagnetic shielding structure is at least provided at one side of the main flexible printed circuit board facing the connection flexible printed circuit board or at one side of the connection flexible printed circuit board facing the main flexible printed circuit board.