Flexible Display Substrate With Thinner Support Parts

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Solution Overview

Problem

In the manufacturing of flexible display devices, damage to display units often occurs due to direct contact with processing devices and the leakage of bonding layers into gaps between display units and protection layers, leading to adhesion issues and damage during the fabrication process.

Innovation Solution

A display substrate design featuring a second flexible substrate with thinner support parts and through holes, along with a retaining wall and packaging layer, is used to prevent bonding layer leakage and reduce stress concentration, ensuring effective bonding and maintaining flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional flexible display substrate structure is used, then the substrate can be manufactured with standard processes, but the display units are easily damaged during fabrication due to direct contact with processing devices and bonding layer leakage

Engineering Contradiction:

Improvedisplay unit integrityVSAvoiddamage during fabrication

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a second flexible substrate as an intermediary protective layer between the display units and processing devices. This protective substrate prevents direct contact damage during fabrication and blocks bonding layer leakage into gaps between display units and protection layers, thereby resolving the technical contradiction between maintaining standard manufacturing processes and preventing display unit damage

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies beforehand cushioning by pre-establishing the protective second flexible substrate and retention walls before the bonding process. This proactive protective structure prevents bonding layer leakage and damage before they can occur during fabrication, addressing the contradiction by preparing protective measures in advance rather than reacting to damage after it occurs

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Ease of manufacture

If the second flexible substrate is made uniformly thick, then manufacturing is simplified, but stress concentration occurs during stretching affecting flexibility

Engineering Contradiction:

Improvesubstrate fabricationVSAvoidstress distribution

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by creating variable thickness regions in the second flexible substrate - thinner regions (second parts) positioned at specific locations to reduce stress concentration during stretching, while maintaining adequate thickness in other areas for structural support. This resolves the contradiction between manufacturing simplicity and stress distribution by implementing localized structural variations rather than uniform thickness

Inventive Principle:

Principle #3Local quality

3Strength

If the bonding layer is applied generously to ensure strong bonding, then bonding strength is improved, but the bonding layer leaks into gaps causing adhesion issues

Engineering Contradiction:

Improvebonding strengthVSAvoidbonding layer leakage

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent uses the protective second flexible substrate and retention walls as intermediary barriers that contain the bonding layer within the intended bonding region. This prevents bonding layer leakage into gaps between display units and protection layers while maintaining adequate bonding strength at the first flexible substrate interface, resolving the contradiction between strong bonding and preventing leakage

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11263931B2Display substrate, fabrication method thereof and display device

Publication Date: 2022.03.01 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure provides a display substrate including: a first flexible substrate; a second flexible substrate; and a bonding layer between the first flexible substrate and the second flexible substrate and bonding the first and second flexible substrates to each other; wherein the second flexible substrate includes a plurality of first support parts and a second support part spacing the plurality of first support parts apart from each other; a side of each first support part distal to the first flexible substrate is provided thereon with a display unit; the second support part includes a first part and a second part other than the first part, and a signal line configured to connect display units is disposed on a side of the first part distal to the first flexible substrate; and a thickness of the second part is smaller than a thickness of the first support part.