Mechanoluminescent Display Projections Using Composite Elastomers

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Solution Overview

Problem

Current mechanoluminescent technologies face limitations in industrial applicability due to short lifetime, lack of color control, and limited studies on stress transmission materials, restricting their use in industries beyond academic interest.

Innovation Solution

A mechanoluminescent display device is developed using a substrate with projections made of a mixture of stress luminescent materials and a stress transmission material, allowing independent control of multiple colors by varying the mechanical energy application, with the stress transmission material being an organic material like PDMS or UV-cured epoxy, enabling efficient light emission through mechanical energy conversion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a UV cured polymer is used as a stress transmission material, then the mechanical strength transmission is effective, but the lifetime is extremely limited due to difficulty in applying repeated stresses

Engineering Contradiction:

ImprovelifetimeVSAvoidrepeated stress application capability

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent changes the material parameters by selecting elastomers with specific elastic moduli (first elastomer with higher elastic modulus, second elastomer with lower elastic modulus) to create a stress transmission system that can withstand repeated stresses while maintaining effective stress transmission to the luminescent material, thereby extending the device lifetime

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material structure by combining different elastomers with distinct mechanical properties (different elastic moduli) to create a stress transmission layer that balances stress transmission efficiency and durability under repeated stress conditions

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If mechanoluminescent phenomenon is applied to various industries, then the industrial applicability is improved, but brightness, lifetime, and color control must be significantly enhanced which are currently limited

Engineering Contradiction:

Improveindustrial applicabilityVSAvoidbrightness

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent applies local quality by selecting different luminescent materials with specific emission characteristics (first luminescent material emitting first color, second luminescent material emitting second color) and positioning them in different regions, while using elastomers with specific mechanical properties to optimize stress transmission to each luminescent material, thereby achieving both brightness enhancement and color control

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If mechanoluminescent phenomenon is applied to various industries, then the industrial applicability is improved, but color control capability must be enhanced which currently does not exist

Engineering Contradiction:

Improveindustrial applicabilityVSAvoidcolor control

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent segments the luminescent layer into multiple regions with different luminescent materials (first luminescent material for first color, second luminescent material for second color), allowing independent color control in different areas of the display device, thereby enabling color control capability for industrial applications

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements local quality by assigning different luminescent materials with specific emission colors to different spatial locations, and using elastomers with tailored mechanical properties to ensure effective stress transmission to each luminescent material, achieving both color control and manufacturability

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 solution expands the industrial applications of mechanoluminescence to lighting, displays, and biology, offering environment-friendly technology by converting mechanical energy into light without external power, enhancing brightness and color control, and improving the device's durability and longevity.

Implementation Method 1

a stress luminescent material emitting light by mechanical energy which is applied

Methodology Applied

Scientific EffectMechanoluminescence: Mechanoluminescence

Implementation Method 2

the stress transmission material transmitting the mechanical energy applied from the outside to the stress luminescent material

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS9791109B2Mechanoluminescent display device

Publication Date: 2017.10.17 DAEGU GYEONGBUK INSTITUTE OF SCIENCE AND TECHNOLOGY

AI summary

Provided is a display device in a mechanical method using wind, vibration. The mechanoluminescent display device includes a substrate having a predetermined shape, and projections formed with a predetermined pattern on the substrate. The projections are formed of a mixture of a stress luminescent material emitting light by mechanical energy which is applied and a stress transmission material transmitting the mechanical energy applied from the outside to the stress luminescent material.