Flexible Display Substrate Soluble Polymer Peeling

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Solution Overview

Problem

Existing methods for manufacturing flexible display substrates face challenges in achieving high production accuracy and reliability due to poor adhesion between the flexible substrate and the carrier substrate, leading to potential damage during the peeling process.

Innovation Solution

A method involving the use of a soluble polymer, such as poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS), is introduced between the flexible display substrate and the carrier substrate, allowing for the flexible substrate to be peeled off by dissolving the polymer, thereby simplifying the manufacturing process and preventing damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a flexible substrate is attached to a glass substrate using adhesive to prepare display components, then production accuracy is maintained, but the flexible substrate is easily peeled off and adhesive is not left, leading to poor reliability

Engineering Contradiction:

Improveproduction accuracyVSAvoidadhesion quality

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent introduces a soluble polymer layer as an intermediary between the flexible substrate and the glass substrate. This polymer layer serves as a temporary adhesive during manufacturing that can be easily removed later, solving the contradiction by providing both initial attachment (for manufacturing precision) and clean separation (for reliability) without leaving residual adhesive

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical parameter of the adhesive from permanent to soluble by using a water-soluble polymer. This parameter change allows the adhesive to function differently at different stages: providing strong attachment during manufacturing, then dissolving completely during the peeling process to leave no residue, thereby resolving the adhesion reliability issue

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If adhesive is used to attach flexible substrate to glass substrate, then components can be fabricated, but the peeling process causes damage to the flexible substrate

Engineering Contradiction:

Improvefabrication easeVSAvoidsubstrate damage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The soluble polymer acts as a sacrificial intermediary that protects the flexible substrate during manufacturing, then dissolves cleanly during peeling to prevent damage. This intermediary approach eliminates the harmful effects of permanent adhesives while maintaining fabrication ease

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical adhesion system (permanent adhesive bonds) with a chemical dissolution system (water-soluble polymer). This substitution allows the peeling process to occur without mechanical stress that would cause substrate damage, while still enabling easy fabrication during the attached state

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If conventional adhesive attachment method is used, then manufacturing process is simple, but good adhesion between glass substrate and flexible substrate is difficult to achieve

Engineering Contradiction:

Improveprocess complexityVSAvoidadhesion quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent changes the chemical parameter of the adhesive from hydrophobic to hydrophilic by using a water-soluble polymer. This parameter change enables the adhesive to bond effectively with both the glass substrate and flexible substrate during manufacturing, then dissolve completely in water to achieve clean separation, thereby achieving both good adhesion and easy removal without increasing process complexity

Inventive Principle:

Principle #35Parameter changes

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 approach enhances the peeling process by ensuring a clean separation of the flexible substrate from the carrier substrate, improving manufacturing efficiency and reducing the risk of damage, while maintaining environmental friendliness through the use of a water-alcohol soluble polymer.

Implementation Method 1

peeling off the flexible substrate from the carrier substrate by dissolving the soluble polymer

Methodology Applied

Scientific EffectDissolution: Solvation

Data Source

PatentUS10353228B2Method for manufacturing flexible display substrate

Publication Date: 2019.07.16 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

The present invention provides a method for manufacturing flexible display substrate, comprising: providing a carrier substrate and depositing a layer of soluble polymer on the carrier substrate; fabricating a flexible substrate on the soluble polymer; fabricating a display component on the other surface of the flexible substrate opposite to the soluble polymer and performing a package process; and, peeling off the flexible substrate from the carrier substrate by dissolving the soluble polymer to obtain the flexible display substrate. The method for manufacturing flexible display substrate of the present invention simplifies the manufacture process and avoids damage to the flexible substrate during the peeling process.