Flexible Display Panel Layer Layout for Sliding Bend Reliability

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Solution Overview

Problem

Existing flexible display panels in sliding and rolling configurations face issues with encapsulation failure, moisture and oxygen invasion, and peeling of the light-emitting layer due to high strain in the bending regions, leading to display failures such as black screens.

Innovation Solution

The flexible display panel design reduces the thickness and number of inorganic insulating layers in the sliding and rolling connection area, ensuring they do not cover this region, and incorporates a level difference filling layer to prevent peeling and air bubbles, while maintaining the display effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inorganic insulating layers are maintained with full thickness in the sliding and rolling connection area, then encapsulation protection is improved, but strain-induced breaking and peeling occur during bending

Engineering Contradiction:

Improveencapsulation protectionVSAvoidresistance to strain during bending

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies different thickness configurations of inorganic insulating layers to different regions of the display panel. Specifically, the sliding and rolling connection area has reduced thickness (either fewer layers or thinner individual layers) compared to the display area, allowing the structure to adapt locally to bending strains while maintaining protection where needed.

Inventive Principle:

Principle #3Local quality

2Strength

If inorganic insulating layers are reduced in the sliding and rolling connection area, then strain resistance is improved, but encapsulation protection deteriorates

Engineering Contradiction:

Improveresistance to strain during bendingVSAvoidencapsulation protection

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the physical parameters of the inorganic insulating layers in the sliding and rolling connection area by reducing either the number of layers or the thickness of individual layers. This parameter modification allows the structure to withstand bending strains while the base substrate and other protective layers maintain encapsulation integrity.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the display panel structure is simplified by reducing inorganic layers, then manufacturing complexity is reduced, but display performance may deteriorate

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoiddisplay performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent implements local quality by applying the reduced inorganic layer configuration only to the sliding and rolling connection area, while maintaining the full inorganic layer structure in the display area. This ensures that display performance is preserved where needed, while manufacturing is simplified in the connection region.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250219039A1Flexible display panel and sliding and rolling display apparatus

Publication Date: 2025.07.03 BOE TECHNOLOGY GROUP CO LTD

AI summary

A flexible display panel has a display area, a bezel area disposed around the display area and a sliding and rolling connection area connected to a first border of the bezel area away from the display area. The flexible display panel includes a base substrate covering at least the display area and the bezel area and one or more inorganic insulating layers located on a side of the base substrate. A total thickness of a portion of the one or more inorganic insulating layers located in the sliding and rolling connection area is less than a total thickness of a portion of the one or more inorganic insulating layers located in the display area.