Flexible PCB Direct Soldering Connection

Solution Overview

Problem

In display devices, the existing methods for connecting flexible printed circuit boards require an equipotential board for efficient power supply, which complicates the process and increases manufacturing costs.

Innovation Solution

The flexible printed circuit boards are connected without an equipotential board by overlapping and using conductive materials like soldering or wire bonding, allowing them to conduct electricity directly, simplifying the process and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If equipotential flexible printed circuit boards are installed and soldered to connect flexible printed circuit boards, then electrical conduction between flexible printed circuit boards is achieved, but the manufacturing process becomes complex and manufacturing costs increase

Engineering Contradiction:

Improveelectrical conductionVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the equipotential flexible printed circuit board from the system. Instead of using separate equipotential boards to connect flexible printed circuit boards, the patent directly connects the flexible printed circuit boards to each other through soldering, removing the unnecessary intermediate component while maintaining electrical conduction functionality

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the connection function that was previously performed by separate equipotential boards into a direct soldering connection between flexible printed circuit boards. This consolidation reduces the number of components and simplifies the manufacturing process while achieving the same electrical conduction objective

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If equipotential flexible printed circuit boards are installed and soldered to connect flexible printed circuit boards, then electrical conduction between flexible printed circuit boards is achieved, but manufacturing costs increase

Engineering Contradiction:

Improveelectrical conductionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention extracts and eliminates the equipotential flexible printed circuit board from the system. Instead of using separate equipotential boards to connect flexible printed circuit boards, the patent directly connects the flexible printed circuit boards to each other through soldering, removing the unnecessary intermediate component while maintaining electrical conduction functionality

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention discards the equipotential flexible printed circuit board component that adds cost without providing additional value. By eliminating this redundant component and using direct soldering connections, the patent reduces material costs and manufacturing expenses while maintaining the required electrical conduction performance

Inventive Principle:

Principle #34Discarding and recovering

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

This approach simplifies the manufacturing process and reduces costs by eliminating the need for equipotential boards while maintaining efficient power supply to pixel portions in display devices.

Implementation Method 1

using conductive materials like soldering or wire bonding, allowing them to conduct electricity directly

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentEP3010061B1Flexible printed circuit boards structure

Publication Date: 2023.08.30 LG DISPLAY CO LTD

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Figure 3~4
Figure 5

AI summary

A flexible printed circuit board installed on a substrate in a display device is provided.