Flexible Printed Circuit Board Compressed Unit for Display Panel Edge
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Solution Overview
Problem
Flexible printed circuit boards (FPCBs) in display panels can cause separation or cracking when bent, due to the exertion of force on flexible substrates, leading to dead areas and reliability issues.
Innovation Solution
A display device design featuring a flexible printed circuit board with a compressed unit connected to the edge of the panel, using a double-sided adhesive tape to reduce bending stress and an adhesive layer surrounding the connection area, with wiring patterns extending from the compressed unit in different directions to minimize dead areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible printed circuit board is positioned at the edge of the panel, then the connection between the display panel and driver is achieved, but bending stress causes separation or cracking of the substrate
Solution Approach 1:
A buffer layer is introduced between the flexible printed circuit board and the display panel substrate. This intermediary layer absorbs and distributes the bending stress, preventing direct stress transmission to the substrate that would cause separation or cracking. The buffer layer acts as a stress-absorbing medium that protects the substrate while maintaining the electrical connection function.
2Reliability
If the compressed unit is positioned away from the edge, then bending stress is reduced, but dead area increases
Solution Approach 1:
The buffer layer is implemented as a thin film structure that provides stress absorption without occupying excessive space. This thin film approach allows the compressed unit to be positioned away from the edge for stress reduction while minimizing the dead area through the use of a space-efficient flexible film structure.
3Reliability
If the adhesive layer surrounds the compressed unit, then separation is prevented, but manufacturing complexity increases
Solution Approach 1:
The adhesive layer is applied in segmented portions rather than as a continuous layer. Specifically, the adhesive is applied to the buffer layer in areas surrounding the compressed unit, creating discrete bonding zones. This segmentation approach prevents separation while simplifying the manufacturing process by reducing adhesive application complexity and material usage.
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 prevents separation and cracking of the panel substrate, reduces dead areas, and enhances the reliability of the display device by distributing bending stress effectively.
Implementation Method 1
The implementation of a compressed unit with flexible printed circuit boards and a double-sided adhesive tape that reduces bending stress by positioning the connection portion away from the edge of the panel
Implementation Method 2
the use of an adhesive layer that surrounds the connection unit, thereby minimizing the transfer of bending forces and preventing separation or cracking
Data Source
AI summary
A display device is disclosed. In one aspect, the display device includes a panel including a plurality of wiring patterns and a flexible printed circuit board formed over and at least partially overlapping an edge of the panel. The flexible printed circuit board includes a connection portion electrically connected to the panel and the connection portion includes first and second surfaces opposing each other. The wiring patterns include a plurality of first wiring patterns connected to the first surface of the connection portion and a plurality of second wiring patterns connected to the second surface of the connection portion.