Flexible Circuit Board Openings for Corrosion-Resistant Bonding
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Solution Overview
Problem
The gold fingers on flexible circuit boards are prone to corrosion, which affects the binding reliability in full-screen display devices with high screen-to-body ratios, leading to reduced performance and durability.
Innovation Solution
A flexible circuit board design featuring a protective layer with strategically sized first and second openings to expose bonding pins, reducing the exposed area and minimizing corrosion risk while ensuring sufficient contact area for reliable binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long gold finger is used to ensure effective contact area for binding, then the binding contact area is improved, but the exposed area to air increases causing corrosion
Solution Approach 1:
The protective layer is selectively removed only at specific locations where bonding pins need to contact, creating local openings rather than leaving the entire gold finger exposed. This localized exposure maintains contact effectiveness while minimizing corrosion risk.
Solution Approach 2:
The harmful protective layer is extracted or removed only from necessary contact areas, allowing bonding pins to be exposed where needed while retaining protection in other areas. This selective removal resolves the contradiction between needing exposure for contact and protection against corrosion.
2Object-affected harmful factors
If the exposed area of bonding pins is reduced to minimize corrosion, then the corrosion resistance is improved, but the contact area for binding may be insufficient
Solution Approach 1:
Different areas of the bonding pin structure are treated differently - some areas are exposed through openings for contact, while other areas remain protected by the protective layer. This local differentiation allows simultaneous optimization of both contact area and corrosion resistance.
Solution Approach 2:
The protective layer is segmented into multiple sections with different exposure levels - first openings for primary contact and second openings for additional contact areas. This segmentation allows precise control over which portions are exposed and which remain protected.
Data Source
AI summary
Embodiments in the present disclosure provide a flexible circuit board and a display device. The flexible circuit board includes a base material, a plurality of binding pins, and a protective layer. The plurality of binding pins are located on the base material, extend in a first direction, and are arranged in a second direction; the protective layer is located on the side of the binding pins facing away from the base material, and includes a plurality of first openings and second openings for exposing the plurality of binding pins, the size of the first openings being greater than that of the second openings; and one binding pin corresponds to one first opening and at least one second opening, and the second opening is located on at least one side of the first opening in the first direction.