Foldable PCB Discharge-Hole Layout for ESD Protection
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Solution Overview
Problem
Electronic devices face challenges in managing electrostatic discharge (ESD) effectively, particularly in flexible and foldable designs, which can compromise their functionality and durability.
Innovation Solution
Incorporating a conductive side frame, a flexible display, a hinge module, and a printed circuit board (PCB) with a conductive member, signal layer, ground layer, and insulation layer, featuring discharge holes or conductive layers visible from the outside to form gaps, facilitating effective ESD pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display and hinge module are integrated into a compact electronic device, then portability and use convenience are improved, but electrostatic discharge protection becomes more difficult to implement effectively
Solution Approach 1:
The PCB is segmented with discrete discharge holes positioned at specific locations to create dedicated ESD pathways. The ground layer is segmented into multiple conductive layers with discharge portions visible from the outside, allowing ESD protection to be implemented in a modular fashion that doesn't compromise the compact flexible design
Solution Approach 2:
The discharge holes act as intermediary structures that connect the signal layer or conductive member to the ground layer, creating a controlled pathway for electrostatic discharge. This intermediary structure allows ESD protection without requiring additional external components that would compromise portability
2Reliability
If the PCB structure is modified to include discharge holes and visible ground layers for ESD protection, then electrostatic discharge protection is improved, but device complexity increases
Solution Approach 1:
The ground layer serves multiple functions: it provides electrical grounding for normal operation and simultaneously serves as an ESD pathway when discharge portions are exposed through the discharge holes. The conductive member also serves dual purposes of signal transmission and ESD conduction, reducing the need for separate dedicated ESD components
Solution Approach 2:
The PCB structure utilizes changes in the visibility parameter of the ground layer by positioning discharge holes to expose ground layer portions from the outside. This parameter change allows the same ground layer to serve ESD protection functions without adding structural complexity or requiring separate ESD components
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
Enhances ESD protection in flexible and foldable electronic devices, ensuring reliable operation and durability by providing efficient discharge paths, thus preventing damage from static electricity.
Implementation Method 1
the PCB includes at least one discharge hole recessed from a side (e.g., surface) of the PCB so that the ground layer is visible from an outside and forming a gap between the signal layer or the conductive member and the ground layer
Data Source
AI summary
An electronic device is provided. The electronic device includes a first housing including a conductive first side frame, a second housing including a conductive second side frame, a flexible display disposed on the first housing and the second housing, a hinge module rotatably coupled between the first housing and the second housing, and a printed circuit board (PCB) disposed on the first housing or the second housing, the PCB includes a conductive member electrically connected to the conductive first side frame or the conductive second side frame, a signal layer, a ground layer, and an insulation layer, wherein the PCB includes at least one discharge hole recessed from a side (e.g., surface) of the PCB so that the ground layer is visible from an outside and forming a gap between the signal layer or the conductive member and the ground layer.