Flexible Printed Circuit Board Structure for Display Devices

Solution Overview

Problem

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

Innovation Solution

A structure of flexible printed circuit boards is implemented where four bar-type flexible printed circuit boards are positioned along the edges of a substrate, with specific pad configurations and soldering or wire bonding connections that allow them to conduct electricity without an equipotential board, simplifying the connection process and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an equipotential flexible printed circuit board is used to connect power supply portions and pixel portions, then electrical connection reliability is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention merges the power supply function and the equipotential connection function into a single flexible printed circuit board structure. The power supply FPCB includes power supply lines for providing power and equipotential lines for maintaining electrical potential, both integrated within the same board rather than using separate equipotential boards.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The flexible printed circuit board is designed to perform multiple functions simultaneously: it serves as both the power supply conduit and the equipotential reference. The board includes both power supply lines and equipotential lines that work together to provide both power delivery and electrical potential stabilization to the pixel portions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If an equipotential flexible printed circuit board is used to connect power supply portions and pixel portions, then electrical connection reliability is improved, but manufacturing cost increases

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention merges the power supply function and the equipotential connection function into a single flexible printed circuit board structure. The power supply FPCB includes power supply lines for providing power and equipotential lines for maintaining electrical potential, both integrated within the same board rather than using separate equipotential boards.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The flexible printed circuit board is designed to perform multiple functions simultaneously: it serves as both the power supply conduit and the equipotential reference. The board includes both power supply lines and equipotential lines that work together to provide both power delivery and electrical potential stabilization to the pixel portions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If multiple separate flexible printed circuit boards are used for power supply and equipotential connections, then electrical connection reliability is improved, but the number of components and assembly steps increases

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidmanufacturing efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention merges the power supply function and the equipotential connection function into a single flexible printed circuit board structure. The power supply FPCB includes power supply lines for providing power and equipotential lines for maintaining electrical potential, both integrated within the same board rather than using separate equipotential boards.

Inventive Principle:

Principle #5Merging (Combining)

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 solution simplifies the manufacturing process and reduces costs by eliminating the need for an equipotential flexible printed circuit board, while maintaining efficient electricity conduction between the boards.

Implementation Method 1

four pairs of soldering portions or four pairs of wire bonding portions, which respectively make the first rectangular anode pad and the first rectangular cathode pad of any one of the four bar-type flexible printed circuit boards conduct electricity with the second rectangular anode pad and the second rectangular cathode pad mounted on a neighboring end portion of another of the four bar-type flexible printed circuit boards

Methodology Applied

Scientific EffectSoldering: Soldering

Data Source

PatentEP3010060B1Structure of flexible printed circuit boards

Publication Date: 2023.07.12 LG DISPLAY CO LTD

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AI summary

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