Variable Modulus Substrate for Flexible Display Yield

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Solution Overview

Problem

Flexible display devices with thin polyimide resin substrates face challenges in manufacturing yield due to deformation during the peeling process, making it difficult to bond protective films effectively, which leads to a drop in yield.

Innovation Solution

A substrate structure with distinct regions of varying Young's modulus, where the second region has a higher modulus than the first region, is used to prevent deformation and improve bonding, specifically using polyimide materials with different Young's modulus ranges for the first and second regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a thin PI resin substrate is used to achieve flexibility, then the flexibility and thinness of the display device is improved, but the substrate deforms during manufacturing processes such as peeling, making it difficult to bond protective films and reducing manufacturing yield

Engineering Contradiction:

ImproveflexibilityVSAvoidsubstrate deformation

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The substrate is designed with different Young's modulus values in different regions: the first region (display area) has a lower Young's modulus to maintain flexibility, while the second region (terminal area) has a higher Young's modulus to prevent deformation during manufacturing and bonding processes

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The substrate is divided into two distinct regions with different mechanical properties: a first region for flexibility and a second region for structural stability, allowing each region to serve its specific function independently

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If the substrate deforms during peeling process, then it becomes difficult to bond protective films in subsequent processes, but adding a protective layer increases device complexity

Engineering Contradiction:

Improvebonding processVSAvoidsubstrate structure

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The substrate structure itself is modified to have different Young's modulus in different regions, with the second region providing inherent deformation resistance to facilitate subsequent bonding processes without adding external protective layers

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The substrate's second region with higher Young's modulus serves as a self-supporting structure that prevents deformation and facilitates bonding processes, eliminating the need for additional protective layers during manufacturing

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS10121800B2Display device including a substrate with regions of different hardness

Publication Date: 2018.11.06 MAGNOLIA WHITE CORP

AI summary

A display device is provided including a substrate having a first region and a second region, a plurality of pixels above the first region, and a connection terminal above the second region, wherein a Young's modulus of the second region is higher than a Young's modulus of the first region.