Display Pad Structure With Insulating Layer to Prevent Shorts
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Solution Overview
Problem
During the rework process of display devices, the shapes of pads can be deformed, leading to potential short defects between pads due to pushed conductive patterns.
Innovation Solution
The display device incorporates a substrate with a pad area featuring a first conductive pattern, an insulating layer overlapping the conductive pattern, and second conductive patterns spaced apart and contacting the first conductive pattern through diagonal contact holes, minimizing deformation and preventing short defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pads are bonded to the circuit board using pressure and adhesive, then the pads can transmit signals and voltages, but the conductive patterns may be pushed and deformed during rework, causing short defects
Solution Approach 1:
The pad structure is segmented into multiple conductive patterns (first, second, and third conductive patterns) separated by insulating layers. This segmentation prevents the conductive patterns from pushing against each other during rework, eliminating the short defect issue while maintaining bonding reliability through the distributed contact points.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the first conductive pattern and the second conductive pattern. This insulating layer prevents direct contact between conductive patterns, stopping the propagation of deformation and preventing short circuits during the rework process.
2Area of stationary object
If the conductive patterns are placed close together to reduce area, then the device area is minimized, but the risk of short defects increases when conductive patterns contact during rework
Solution Approach 1:
The insulating layer acts as a mediator that allows conductive patterns to be placed in close proximity while preventing electrical contact between them. This enables area minimization without increasing short defect risk, as the insulating layer maintains electrical isolation even when patterns are physically close.
Solution Approach 2:
The solution moves the isolation mechanism from the planar dimension to the vertical dimension by stacking insulating layers between conductive patterns. This allows conductive patterns to be closely spaced in the plane while maintaining separation through the thickness direction, achieving both area minimization and short defect prevention.
3Reliability
If multiple conductive patterns are stacked to achieve electrical connection, then the electrical connectivity is improved, but the complexity of the pad structure increases
Solution Approach 1:
The electrical connection is segmented into multiple discrete conductive patterns stacked in layers rather than using a single complex continuous pattern. Each layer serves a specific electrical function, and the segmentation allows for simpler individual patterns that are easier to manufacture and inspect while achieving the required connectivity.
Data Source
AI summary
A display device includes a substrate including a pad area, a first conductive pattern disposed in the pad area on the substrate, an insulating layer disposed on the first conductive pattern and overlapping the first conductive pattern, second conductive patterns disposed on the insulating layer, spaced apart from each other, and contacting the first conductive pattern through contact holes formed in the insulating layer, and a third conductive pattern disposed on the second conductive patterns and contacting the insulating layer.