Flexible Circuit Board Cut Portion Alignment

Solution Overview

Problem

Existing display devices with flexible circuit boards face challenges in reducing stretch dispersion when compressed to the display panel, leading to misalignment of terminals and signal pads under heat and pressure.

Innovation Solution

Incorporating a cut portion on the flexible circuit board that overlaps a dummy pad portion on the display panel, allowing for precise alignment and reduced stretch dispersion by designing the terminal and cut portion geometry to withstand compression without deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the flexible circuit board is compressed to the display panel by applying heat and pressure, then the terminals are electrically connected to the signal pads, but the stretch dispersion increases causing misalignment

Engineering Contradiction:

Improveelectrical connectionVSAvoidalignment precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The flexible circuit board is divided into multiple terminal portions (first terminal portion, second terminal portion, third terminal portion) separated by cut portions. This segmentation allows each portion to independently accommodate stretch during compression, reducing overall stretch dispersion and maintaining alignment precision while ensuring reliable electrical connections.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the flexible circuit board is designed with more terminals for better electrical connection, then the connection reliability improves, but the stretch dispersion increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoidalignment precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The flexible circuit board is divided into multiple terminal portions (first terminal portion, second terminal portion, third terminal portion) separated by cut portions. This segmentation allows each portion to independently accommodate stretch during compression, reducing overall stretch dispersion and maintaining alignment precision while ensuring reliable electrical connections.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the flexible circuit board are designed with different characteristics. The terminal portions contain terminals for electrical connection, while the cut portions are designed to overlap with dummy pad portions to accommodate stretch. This local differentiation allows the board to maintain both connection reliability and alignment precision.

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If the flexible circuit board is made more rigid to maintain alignment, then the alignment precision improves, but the flexibility is reduced

Engineering Contradiction:

Improvealignment precisionVSAvoidflexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The flexible circuit board is divided into multiple terminal portions (first terminal portion, second terminal portion, third terminal portion) separated by cut portions. This segmentation allows each portion to independently accommodate stretch during compression, reducing overall stretch dispersion and maintaining alignment precision while ensuring reliable electrical connections.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the flexible circuit board are designed with different characteristics. The terminal portions contain terminals for electrical connection, while the cut portions are designed to overlap with dummy pad portions to accommodate stretch. This local differentiation allows the board to maintain both connection reliability and alignment precision.

Inventive Principle:

Principle #3Local quality

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 solution effectively reduces stretch dispersion and improves the alignment between terminals and signal pads, enhancing the electrical connection and reliability of the display device.

Implementation Method 1

a method of interposing an anisotropic conductive film between the display panel and the flexible circuit board and compressing the flexible circuit board to the display panel by applying heat and pressure

Methodology Applied

Scientific EffectAnisotropic conduction: Anisotropy

Data Source

PatentUS11947227B2Display device

Publication Date: 2024.04.02 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel including a first signal pad portion including first signal pads, a second signal pad portion including second signal pads, and a first dummy pad portion disposed between the first signal pad portion and the second signal pad portion and including at least one first dummy pad, and a flexible circuit board including a first terminal portion including first terminals, a second terminal portion including second terminals, and a first cut portion disposed between the first terminal portion and the second terminal portion. The flexible circuit board is compressed to the display panel. The first terminals are electrically connected to the first signal pads. The second terminals are electrically connected to the second signal pads. The first cut portion overlaps the first dummy pad portion.