Printed Circuit Board Pad Group Segmentation for Display Bonding
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Solution Overview
Problem
High-resolution display apparatuses face challenges with increased non-display areas due to numerous pads for signal transmission and reception, leading to bonding failures between flexible printed circuit boards and display panels, particularly caused by dummy lines and uneven load distribution during the bonding process.
Innovation Solution
The design incorporates a printed circuit board with strategically arranged pad group areas, including first and second row pads, and dummy lines that control the flow path of conductive adhesion material, ensuring uniform load distribution and preventing bonding failures by reducing the imbalance in load applied to different areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of pads is increased to support high-resolution display, then signal transmission capability is improved, but the non-display area increases
Solution Approach 1:
The pad area is segmented into multiple pad group areas arranged in rows and columns. Each pad group area contains multiple pads organized in a structured pattern, allowing efficient space utilization. This segmentation enables high-density pad arrangement while maintaining manageable complexity in the bonding process.
Solution Approach 2:
Pads are arranged in multiple rows and columns forming a two-dimensional grid pattern within the pad group areas. This multi-dimensional arrangement maximizes the use of available space, allowing more pads to be accommodated in a compact area compared to single-row linear arrangements.
2Strength
If dummy lines are added to the printed circuit board, then structural support is improved, but bonding failures occur due to uneven load distribution
Solution Approach 1:
Dummy lines are selectively placed in specific regions of the printed circuit board rather than uniformly across the entire board. The dummy lines are positioned to target areas with insufficient structural support, creating localized reinforcement zones. This approach ensures even load distribution during bonding while avoiding unnecessary dummy lines in already sufficient areas, preventing bonding failures.
3Area of stationary object
If pad group areas are concentrated in a limited area, then non-display area is reduced, but bonding uniformity becomes difficult to maintain
Solution Approach 1:
The concentrated pad area is divided into multiple pad group areas with standardized structures. Each pad group area contains pads arranged in consistent patterns, ensuring uniform bonding characteristics across the entire pad region. This segmentation maintains bonding uniformity even when pads are densely packed in a limited area.
Solution Approach 2:
The spacing between pads and the dimensions of pad group areas are optimized to achieve both high density and bonding uniformity. By carefully controlling parameters such as pad pitch, pad group area size, and spacing between dummy lines, the design achieves compact pad arrangement while maintaining consistent bonding conditions across all pad regions.
Data Source
AI summary
A printed circuit board includes: a base substrate having a plurality of pad group areas arranged in a first direction on the base substrate, each of the pad group areas being divided into first, second, and third pad areas that are sequentially arranged in a second direction crossing the first direction; first and second row pads disposed within each of the pad group areas and arranged in a third direction crossing the first and second directions; first lines respectively connected to the first row pads; and lower dummy lines on a same layer as that of the first lines. Some of the first row pads are in the first pad area, rest of the first row pads and some of the second row pads are in the second pad area, and rest of the second row pads are in the third pad area.