PCB Reference Ground Trace for Stable Power Supply
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Solution Overview
Problem
Current printed circuit boards in LCD devices suffer from unstable power supply voltage due to blocked connections between the system ground and reference ground, leading to increased ripple and poor electromagnetic interference resistance.
Innovation Solution
A printed circuit board design with a first wiring layer, a second wiring layer, and an insulating layer, where the power traces overlap the positive power supply signal line and are connected through via holes, and a reference ground trace is disposed between the power traces to ensure stable voltage on the reference ground pin, reducing ripple and enhancing electromagnetic interference resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection trace overlaps the positive power supply signal line and connects through a via hole, then the power supply connection is established, but the reference ground connection is blocked and voltage becomes unstable
Solution Approach 1:
The patent segments the ground connection path by introducing a dedicated reference ground trace that is electrically isolated from the power supply connection. This separate ground trace provides an independent path for reference ground potential, preventing the power connection from blocking the ground connection.
Solution Approach 2:
The reference ground trace acts as an intermediary element that mediates between the reference ground pin and the system ground line. It provides a dedicated conductive path that ensures stable reference ground voltage without being affected by the power supply connection through the via hole.
2Ease of manufacture
If the reference ground pin is separated from the system ground line, then the power supply can be connected, but the voltage on the reference ground pin becomes unstable
Solution Approach 1:
The patent segments the ground system into two distinct paths: one for power supply connection and another for reference ground connection. The reference ground trace provides a dedicated path that maintains stable voltage by being separate from the power connection path.
Solution Approach 2:
The reference ground trace is designed to maintain equipotential conditions at the reference ground pin by providing a low-impedance path to the system ground line. This ensures that the reference ground pin remains at a stable potential despite the separation caused by the power connection.
3Device complexity
If the connection trace is spaced apart from the system ground line, then the via hole connection is simplified, but the electromagnetic interference performance deteriorates
Solution Approach 1:
The patent extracts the ground connection function from the power supply connection by introducing a separate reference ground trace. This dedicated ground trace can be optimized for electromagnetic interference performance independently from the power connection requirements.
Solution Approach 2:
The reference ground trace is positioned and designed with specific local characteristics to optimize electromagnetic interference performance. It can be routed closer to power lines in critical areas while maintaining overall simplicity in via hole structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design provides a stable power supply voltage with reduced ripple and improved electromagnetic interference resistance, ensuring normal operation of chip-on-films in display devices.
Implementation Method 1
The insulating layer has a via hole corresponding to an overlapping portion of the each of the power traces and the positive power supply signal line. The each of the power traces is connected to the positive power supply signal line through the via hole.
Data Source
AI summary
A printed circuit board and a display device are provided. A second wiring layer of the PCB includes a trace group, a system ground and an output pin group that includes power supply pins and a reference ground pin. One end of the power trace of the trace group is connected to one power supply pin, and another end of the power trace extends toward the system ground line. The insulating layer has a via hole corresponding to an overlapping portion of the power trace and the positive power supply signal line. The reference ground trace is disposed between the two power traces. The reference ground trace is between the reference ground pin and the system ground line. Voltage on the reference ground pin is stable to provide a stable power supply voltage. The ripple of the power supply voltage is reduced. The electromagnetic interference resistance is strong.