Device Array Substrate With Edge Openings to Reduce Wiring Breakage

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Solution Overview

Problem

The connection between wiring and island electronic devices in stretchable display devices is prone to breakage due to high stress when the display device is stretched.

Innovation Solution

A device array substrate with a flexible base and pixel island featuring openings at its edges, through which connection lines enter, dispersing stress and reducing breakage by altering the wiring climbing direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the display device is stretched to enable flexibility and wearability, then the adaptability and comfort are improved, but the connection line between wiring and island electronic devices is subjected to huge stress causing breakage

Engineering Contradiction:

ImprovestretchabilityVSAvoidconnection line integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The pixel electrode is divided into multiple pixel islands that are spatially separated and independently supported by protruding portions. This segmentation allows the connection lines to enter each pixel island through openings at different locations, distributing the mechanical stress that would otherwise concentrate at a single connection point, thereby preventing breakage during stretching

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection line is configured to enter the pixel island from the edge through an opening rather than connecting at the center or top surface. This dimensional change in connection geometry allows the connection point to be positioned at the periphery where stress distribution is more favorable during stretching, reducing the likelihood of breakage

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the connection line is made more robust to prevent breakage during stretching, then the reliability is improved, but the flexibility and stretchability of the display device is reduced

Engineering Contradiction:

Improveconnection line integrityVSAvoidstretchability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The pixel island structure provides localized mechanical support through protruding portions that extend from the substrate. This local reinforcement at specific support points allows the connection lines to be anchored securely without requiring the entire display structure to be rigid, maintaining overall flexibility while ensuring connection integrity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The opening in the pixel island acts as an intermediary structure that facilitates the entry and anchoring of the connection line. This intermediate feature distributes the mechanical load from the connection line across a broader area of the pixel island, reducing stress concentration and enabling both reliability and stretchability

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250291387A1Device array substrate and display device

Publication Date: 2025.09.18 AU OPTRONICS CORP

AI summary

A device array substrate is provided and includes a flexible base, a pixel island, and a connection line. The pixel island is disposed on the flexible base, and at least one edge of the pixel island is provided with at least one opening. The connection line enters the pixel island via the opening. A display device is also provided and includes the device array substrate.