Display Device Side Surface Connection Pads
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Solution Overview
Problem
Conventional display devices have a large peripheral area due to the size of the substrate for the printed circuit board, which limits the display area and increases the defect occurrence rate.
Innovation Solution
A display device design featuring a substrate with a first insulating layer having recess portions and through holes, where pads are placed to fill these recesses and holes, enhancing the contact area and reducing contact resistance and defect rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the substrate area is increased to accommodate the printed circuit board, then the connection reliability is improved, but the peripheral area increases and the display area decreases
Solution Approach 1:
The pad structure extends in the vertical dimension by forming recess portions and through holes that penetrate the insulating layer. This allows the pad to achieve greater connection reliability through increased contact area in the depth direction, rather than requiring a larger substrate area in the horizontal plane.
Solution Approach 2:
The pad structure is nested within the insulating layer by forming recess portions and through holes that penetrate through it. This nesting approach allows the pad to be embedded in the insulating layer, achieving reliable connection without increasing the overall substrate area.
2Reliability
If the pad contact area is increased to reduce contact resistance, then the signal transmission quality is improved, but the manufacturing complexity increases
Solution Approach 1:
The insulating layer is segmented by forming through holes that penetrate it completely. This segmentation allows the pad to make contact with underlying structures through these holes, achieving low contact resistance while using standard fabrication techniques for creating through holes.
Solution Approach 2:
The recess portions and through holes are strategically positioned at specific locations where electrical connection is needed. This local modification approach concentrates the complexity only where necessary for connection, rather than requiring complex structures across the entire substrate.
Data Source
AI summary
A display device with a reduced area of dead spaces and a low defect occurrence rate includes a substrate including a display area and a peripheral area; and a first insulating layer disposed over the peripheral area and including a first side surface portion, a second side surface portion, and at least one recess portion. The first side surface portion includes a side surface aligned with a side surface of the substrate, and the second side surface portion includes a side surface aligned with the side surface of the substrate and is spaced apart from the first side surface portion. A first pad is disposed on the first insulating layer, extends to an edge of the substrate, fills the at least one recess portion, and includes a front end surface aligned with the side surface of the substrate.