Circuit Board Protective Layer Layout for Compression Defect Reduction
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Solution Overview
Problem
Existing circuit boards used in display devices often suffer from compression defects due to lifting between the circuit board and the display panel, which can lead to manufacturing issues and increased costs.
Innovation Solution
A circuit board design featuring multiple insulating layers, conductive layers, connection pads, signal lines, and protective layers, where the protective layer overlaps the pad area and is positioned in the same plane as the connection pad, reducing the likelihood of compression defects by eliminating step formation between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional circuit board structure is used, then manufacturing is simpler, but compression defects occur due to lifting between circuit board and display panel
Solution Approach 1:
The patent applies dimensionality change by extending the protective layer laterally beyond the conventional boundaries to overlap the pad area. This lateral extension into the horizontal dimension creates a step-free surface that prevents lifting between the circuit board and display panel, thereby reducing compression defects without fundamentally changing the vertical layering structure.
Solution Approach 2:
The protective layer serves as an intermediary element that bridges the gap between the circuit board structure and the display panel. By positioning the protective layer to overlap the pad area and extend laterally, it acts as a mediator that eliminates the lifting issue between the circuit board and display panel, preventing compression defects at the interface.
2Reliability
If protective layer is positioned in same plane as connection pad, then compression defects are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent resolves the precision challenge by shifting the alignment strategy to the lateral dimension. Instead of requiring precise vertical alignment in the thickness direction, the protective layer is designed to overlap the pad area horizontally, creating a step-free surface that is more tolerant to manufacturing variations in the vertical dimension.
Solution Approach 2:
The patent changes the critical alignment parameter from vertical thickness matching to lateral overlap extent. By positioning the protective layer to overlap the pad area horizontally and extend beyond conventional boundaries, the design transforms the precision requirement from a tight vertical gap control to a more manageable lateral positioning task, reducing overall manufacturing precision demands.
3Productivity
If conventional circuit board design is used, then device complexity is lower, but production efficiency decreases due to manufacturing issues
Solution Approach 1:
The patent improves productivity by addressing the root cause of manufacturing defects through lateral extension of the protective layer. This dimensional change eliminates lifting and compression defects that would otherwise require rework or lead to production failures, thereby improving overall production efficiency despite the slightly more complex structure.
Solution Approach 2:
The protective layer acts as a mediator that prevents manufacturing defects at the interface between the circuit board and display panel. By eliminating lifting and compression issues through its overlapping configuration, it reduces production failures and rework, thereby improving productivity even though the structure is somewhat more complex than conventional designs.
Data Source
AI summary
A circuit board includes a plurality of insulating layers, at least one conductive layer disposed between the plurality of insulating layers, a connection pad disposed under the conductive layer, a signal line disposed under the conductive layer and electrically connected to the connection pad, and a protective layer disposed under the conductive layer and having a lower surface positioned in a same plane as a lower surface of the connection pad.