Mechanoluminescence Layer for Flexible OLED Stress Absorption

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Solution Overview

Problem

Flexible organic light-emitting diode (OLED) devices prone to peeling off between the cathode and OLED film layers when bent or folded due to stress concentration regions.

Innovation Solution

Incorporating a mechanoluminescence layer on the side of the light-emitting surface of the OLED device, which absorbs stress, converts it into an optical signal, and emits light to reduce stress accumulation and enhance binding force between the cathode and OLED film layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If flexible OLED devices are bent or folded, then flexibility and portability are improved, but peeling off between cathodes and OLED film layers occurs due to stress concentration

Engineering Contradiction:

ImproveflexibilityVSAvoidbinding force between cathode and OLED film layer

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent converts the harmful stress concentration that causes peeling into a beneficial effect by introducing a mechanoluminescence layer. This layer absorbs the mechanical stress generated during bending and converts it into light emission, thereby reducing stress accumulation at the interface between the cathode and OLED film layer, and preventing peeling while maintaining flexibility

Inventive Principle:

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

Solution Approach 2:

The mechanoluminescence layer serves as an intermediary between the bending force and the OLED structure. It absorbs the mechanical stress through its mechanoluminescent properties and converts it to light, acting as a buffer that protects the interface between the cathode and OLED film layer from direct stress concentration, thereby maintaining binding force while enabling flexibility

Inventive Principle:

Principle #24Intermediary (Mediator)

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

The mechanoluminescence layer effectively reduces stress accumulation at bending points, preventing peeling off and enhancing the stability and service life of the flexible OLED display panel.

Implementation Method 1

the mechanoluminescence layer is configured to absorb stress which is generated when the flexible display panel is bent, to convert the stress into an optical signal, and to emit the optical signal

Methodology Applied

Scientific EffectMechanoluminescence: Mechanoluminescence

Data Source

PatentUS12232354B2Flexible display panel having stress absorption function and manufacturing method of flexible display panel

Publication Date: 2025.02.18 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

A flexible display panel and a manufacturing method of the flexible display panel are provided. Wherein, the flexible display panel includes: a light-emitting layer, wherein the light-emitting layer includes a light-emitting surface; a mechanoluminescence layer, wherein the mechanoluminescence layer is disposed on the side of the light-emitting surface of the light-emitting layer, and the mechanoluminescence layer is configured to absorb the stress which is generated when the flexible display panel is bent, to convert the stress into the optical signal, and to emit the optical signal. A problem that a stress concentration region of the flexible display panel is prone to failure is solved.