PCB Metal Pattern Isolation for Display Module ESD Protection

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Solution Overview

Problem

Static electricity causes unstable operation and damage to electronic devices in display modules during electro-static discharge (ESD) tests, leading to issues like flashing lines, jittering, and screen flickering.

Innovation Solution

A printed circuit board design with a blank area and encapsulation area, incorporating an electrostatic isolation device that separates metal patterns and pads, reducing charge transfer paths, and connecting functional electronic devices to a second metal pattern to minimize electrostatic interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the first metal pattern and second metal pattern are connected directly, then the charge transfer path is short and electrostatic discharge is efficient, but electrostatic interference affects functional electronic devices

Engineering Contradiction:

Improveelectrostatic discharge efficiencyVSAvoidelectrostatic interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an electrostatic isolation device as an intermediary component between the first metal pattern and second metal pattern. This device allows electrostatic charges to be transferred from the first metal pattern to the second metal pattern while blocking high-frequency signals and electromagnetic interference, thus protecting functional electronic devices from electrostatic interference while maintaining discharge efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the metal patterns into separate first and second metal patterns located in different areas (blank area and encapsulation area respectively), with the electrostatic isolation device positioned between them. This segmentation allows independent optimization of each metal pattern's function while maintaining overall electrostatic protection

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the first pad and second pad are positioned far apart, then the layout is flexible and components can be arranged freely, but the charge transfer path becomes longer and electrostatic protection is reduced

Engineering Contradiction:

Improvelayout flexibilityVSAvoidcharge transfer path length

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The patent applies local quality by positioning the first pad and second pad at specific locations close to the boundary area between the blank area and encapsulation area. This localized arrangement optimizes the charge transfer path length for electrostatic protection while maintaining overall layout flexibility through the modular design of the printed circuit board

Inventive Principle:

Principle #3Local quality

3Reliability

If the first metal pattern area is large, then it can accommodate more components and provide better electrostatic discharge capacity, but it occupies more space and may interfere with functional electronic devices

Engineering Contradiction:

Improveelectrostatic discharge capacityVSAvoidmetal pattern area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent segments the electrostatic discharge function into a dedicated first metal pattern area (blank area) separate from the functional electronic device area (encapsulation area). This segmentation allows the first metal pattern to be sized optimally for electrostatic discharge capacity without interfering with functional components, as each area serves its specific purpose independently

Inventive Principle:

Principle #1Segmentation

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

Reduces the impact of electrostatic charges on functional electronic devices, preventing display abnormalities and improving picture stability and display quality by minimizing charge transfer to the second metal pattern.

Implementation Method 1

the first pad and the second pad are configured to be connected to an electrostatic isolation device... reduces the impact of electrostatic charges on functional electronic devices

Methodology Applied

Scientific EffectElectrostatic isolation: Electrostatics

Data Source

PatentUS12471208B2Printed circuit board, display module and driving method thereof, and display device

Publication Date: 2025.11.11 HEFEI XINSHENG OPTOELECTRONICS TECH CO LTD

AI summary

Disclosed are a printed circuit board, a display module and a driving method thereof, and a display device. The printed circuit board includes a blank area and an encapsulation area. The printed circuit board includes a first metal layer including a first metal pattern and a second metal pattern separated from each other, a first pad connected to the first metal pattern, and a second pad connected to the second metal pattern. The first metal pattern is located in the blank area, and the second metal pattern is located in the encapsulation area. The first pad and the second pad are configured to be connected to an electrostatic isolation device, and the second metal pattern is configured to be connected to a functional electronic device.