Flexible Display Panel Segmented Release Layer

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Solution Overview

Problem

Conventional flexible display panels face yield reduction and damage during the release process from carrier substrates due to inadequate substrate support and excessive debonding forces, which impede the development of next-generation display devices.

Innovation Solution

A flexible display panel with regions of different debonding forces is fabricated by forming a barrier layer, a flexible layer, and a display device array on a carrier substrate, where the release layer has openings creating a stronger adhesion in the active region and a weaker adhesion in the peripheral region to prevent damage during separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the plastic thin film is adhered to a glass substrate before device formation, then the substrate provides sufficient support for display devices and switching devices, but the debonding force during release is excessive and damages the devices

Engineering Contradiction:

Improvesubstrate support strengthVSAvoiddamage to display devices and switching devices during release

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent segments the adhesive interface into two distinct regions: a peripheral region with strong adhesion for substrate support, and a central region with weak adhesion for damage-free release. This is achieved by forming a release layer only in the peripheral region, creating differentiated bonding characteristics across the substrate surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by providing different adhesive properties at different locations on the substrate. The peripheral region maintains strong bonding to glass substrate, while the central region has weak bonding to facilitate release, allowing each region to serve its specific function optimally.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If the plastic thin film is released from the carrier substrate after device formation, then the flexible display panel can be detached, but the excessive debonding force damages the display devices and switching devices

Engineering Contradiction:

Improvedetachability of flexible display panelVSAvoidyield of flexible display panel due to device damage

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The release layer is segmented to exist only in the peripheral region, separating the detachment function from the device support function. This allows the panel to be detached while protecting the central region where display devices and switching devices are located from excessive debonding forces.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The release layer acts as an intermediary element between the plastic thin film and the glass substrate in the peripheral region. It provides controlled adhesion that facilitates detachment while the central region provides direct support without the release layer, protecting sensitive devices during the release process.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a release layer with openings is formed in the peripheral region, then adhesion is stronger in the active region and weaker in the peripheral region, but the structure becomes more complex

Engineering Contradiction:

Improveprotection of driving IC and conductive line during releaseVSAvoidstructure complexity of barrier layer and flexible layer

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The barrier layer is segmented with openings that expose the flexible layer in the peripheral region. This segmentation creates the differentiated adhesion structure needed for protected release, while the regular pattern of openings maintains manufacturing feasibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The openings in the barrier layer create local quality differences: the covered regions provide strong adhesion and protection, while the exposed peripheral regions provide weak adhesion for controlled release. This local differentiation achieves device protection without requiring entirely new structural concepts.

Inventive Principle:

Principle #3Local quality

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 yield of flexible display panels by ensuring sufficient adhesion and preventing damage to driving ICs and conductive lines, while also providing a conductive and water-resistant barrier layer that prevents electrostatic discharge and extends the panel's lifetime.

Implementation Method 1

a debonding force of the first interface is greater than a debonding force of the second interface

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS10573830B2Flexible display panel and method of fabricating flexible display panel

Publication Date: 2020.02.25 AU OPTRONICS CORP

AI summary

A flexible display panel has an active region and a peripheral region surrounding the active region. The flexible display panel includes a barrier layer, a flexible layer, a display device array and a driving IC. The barrier layer has a first opening. The flexible layer is disposed on the barrier layer, and filled into the first opening of the barrier layer. The display device array is disposed on the flexible layer and located in the active region. The driving IC is disposed on the flexible layer, electrically connected to the display device array and corresponding to the first opening of the barrier layer.