Flexible PCB Through-Hole Layout for Narrow-Bezel Displays
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Solution Overview
Problem
The existing display devices face limitations in reducing the bezel area size due to the instability and potential cracking of flexible printed circuit boards when bent, which exposes the wiring and touch sensing structures, making it difficult to implement a large screen on small portable devices.
Innovation Solution
A display device design that includes a bending area with a flexible printed circuit board connected to a conductive part penetrating a base substrate without bending, eliminating the need for a bending protection layer and spacer between the film and protection member, allowing the second surface of the flexible printed circuit board to be externally exposed, thereby reducing the bezel area size and preventing cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the flexible printed circuit board is bent to reduce the bezel area size, then the bezel area size is reduced, but the flexible printed circuit board becomes unstable and cracks may occur in the circuit wiring
Solution Approach 1:
The flexible printed circuit board is divided into a bending area and a non-bending area. The non-bending area maintains structural integrity and electrical connection stability, while the bending area is specifically designed to be flexible for reducing bezel size. This segmentation allows the board to achieve size reduction without compromising overall reliability.
Solution Approach 2:
Different areas of the flexible printed circuit board are assigned different functional properties: the bending area is designed with flexible characteristics to enable curvature and size reduction, while the non-bending area maintains rigidity and stability for reliable electrical connections. This local differentiation resolves the contradiction between size reduction and stability.
2Area of stationary object
If the flexible printed circuit board is bent, then the driving circuit chip can be positioned under the display panel reducing bezel area, but process handling becomes poor and cracks may occur
Solution Approach 1:
By segmenting the flexible printed circuit board into bending and non-bending areas with distinct functional requirements, the manufacturing process can be optimized for each area separately. The non-bending area maintains standard handling characteristics while the bending area is specifically processed for flexibility, improving overall manufacturability.
Solution Approach 2:
The flexible printed circuit board is pre-formed with a specific curvature profile during manufacturing, with the bending area pre-shaped to match the final device configuration. This preliminary action eliminates the need for complex post-assembly bending operations, significantly improving process handling and reducing the risk of cracks during assembly.
Data Source
AI summary
A display device includes a display panel including a bending area and a non-bending area adjacent to the bending area, a base substrate disposed under the display panel and including a through-hole overlapping the bending area, a conductive part filling the through-hole, a flexible printed circuit board including a first surface connected to the conductive part and second a surface opposite to the first surface, a first film contacting the first surface of the flexible printed circuit board overlapping the non-bending area, and a protection member contacting an upper surface of the first film.