PCB Pad Terminal Inclination for Display Signal Reliability
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Solution Overview
Problem
Current display devices, particularly OLED devices, face challenges in accurately aligning and disposing pad terminals on printed circuit boards and display substrates, which affects the uniformity of the contact area, leading to potential signal transmission issues.
Innovation Solution
The design incorporates a printed circuit board with a base film and a second pad part that includes first and second contact terminals arranged in specific inclination angles and areas, with the first contact terminals having larger areas than the second, to ensure uniform contact with the display substrate's pad terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pad terminals are aligned and disposed to ensure accurate signal transmission, then signal transmission accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The contact terminals are designed with different contact areas (first contact terminals have larger areas than second contact terminals) to compensate for alignment variations. This local variation in contact area ensures that even with manufacturing tolerances, adequate contact is maintained across all terminals, thereby improving signal transmission reliability without requiring extremely high alignment precision.
Solution Approach 2:
The patent changes the contact area parameter of the pad terminals, creating a gradient where first contact terminals have larger areas than second contact terminals. This parameter modification allows the system to tolerate alignment variations while maintaining consistent contact quality, resolving the contradiction between reliability and manufacturing precision requirements.
2Reliability
If contact area uniformity is maintained across all pad terminals, then signal transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces asymmetry in the contact terminal design by making first contact terminals have different (larger) contact areas than second contact terminals. This asymmetric design simplifies the overall structure compared to requiring all terminals to have identical complex alignment mechanisms, while still achieving uniform contact area and reliable signal transmission.
Data Source
AI summary
A display device including: a display substrate including a display area configured to display an image and a pad area positioned on the periphery of the display area; a first pad part positioned above the pad area and including first pad terminals arranged in a first direction; and a printed circuit board including a base film and a second pad part positioned at one side of the base film and coupled with the first pad part, the second pad part includes first contact terminals coupled with first pad terminals, each of first contact terminals includes first contact pad terminals arranged along a first row forming a first inclination angle with the first direction, and second contact pad terminals spaced from first contact pad terminals and arranged along a second row forming a second inclination angle with the first direction.