Flexible Display Substrate Isolating Film for Residue-Free Stripping

Solution Overview

Problem

In the preparation of flexible OLED display substrates, the evaporation process leads to inorganic material residues on the glass substrate, causing stripping abnormalities and requiring additional protective film layers that increase costs and introduce defects like foreign materials, bubbles, and warping.

Innovation Solution

A method involving the formation of an isolating protective film layer on a rigid substrate, followed by a flexible base and functional layer, where the isolating protective film layer prevents inorganic material from remaining on the substrate during evaporation and strips the rigid substrate without additional protective layers, reducing defects and costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional protective film layers are added to prevent inorganic material residues, then substrate protection is improved, but manufacturing cost and process complexity increase

Engineering Contradiction:

Improvesubstrate protectionVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and removes the harmful inorganic material residues from the substrate surface through the isolating protective film layer, preventing them from causing defects. This eliminates the need for additional protective film layers while maintaining substrate protection, thereby reducing process complexity and manufacturing cost.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The isolating protective film layer acts as an intermediary between the evaporation process and the substrate, preventing inorganic material from directly contacting and remaining on the substrate. This mediator approach protects the substrate without requiring multiple protective layers, simplifying the overall process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If additional protective film layers are added to prevent inorganic material residues, then substrate protection is improved, but manufacturing cost increases

Engineering Contradiction:

Improvesubstrate protectionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent extracts and removes the harmful inorganic material residues from the substrate surface through the isolating protective film layer, preventing them from causing defects. This eliminates the need for additional protective film layers while maintaining substrate protection, thereby reducing process complexity and manufacturing cost.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The isolating protective film layer serves as a disposable, cost-effective solution that prevents inorganic material contamination during the evaporation process. By using this single, inexpensive protective layer instead of multiple expensive protective films, the manufacturing cost is reduced while maintaining adequate substrate protection.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If additional protective film layers are added, then inorganic material residue prevention is improved, but defect introduction increases

Engineering Contradiction:

Improveinorganic material residue preventionVSAvoiddefect introduction

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and removes the harmful inorganic material residues from the substrate surface through the isolating protective film layer, preventing them from causing defects. This eliminates the need for additional protective film layers while maintaining substrate protection, thereby reducing process complexity and manufacturing cost.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The isolating protective film layer converts the potentially harmful evaporation process into a beneficial one by preventing inorganic material from contacting the substrate. This single protective approach prevents defects without introducing the additional defects that would arise from multiple protective layers, such as foreign materials, bubbles, and warping.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 method ensures successful stripping of the rigid substrate without residue, reduces process defects, and lowers material and equipment costs by eliminating the need for additional protective film layers, enhancing product competitiveness.

Implementation Method 1

forming an organic resin solution on the rigid substrate; and curing the organic resin solution to form the isolating protective film layer

Methodology Applied

Scientific EffectCuring: Photopolymerisation

Implementation Method 2

forming the functional layer on the flexible base through evaporation

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS12167671B2Flexible display substrate and method for preparing same, and display device

Publication Date: 2024.12.10 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A method for preparing a flexible display substrate is provided. The method includes: forming an isolating protective film layer on a rigid substrate; forming a flexible base on the isolating protective film layer; forming a functional layer on the flexible base; and stripping the rigid substrate to form the flexible display substrate.