Stretchable Display Frame Modulus Gradient

Solution Overview

Problem

Stretchable display devices face challenges with contraction and stress when stretched, leading to potential damage and reduced reliability due to the mismatch in moduli between the substrate and frame, as well as issues with reflectance and adhesiveness.

Innovation Solution

A stretchable display device design featuring a frame with a higher modulus than the substrates, dispersed pigments to reduce reflectance, and an adhesive material to enhance adhesiveness between the substrate and frame, along with a layered frame structure to manage stress and moisture, thereby reducing contraction and improving reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a frame with higher modulus than the stretching substrate is used, then contraction of the display panel is reduced, but stress concentration at the interface may increase

Engineering Contradiction:

Improvecontraction reductionVSAvoidinterface stress

Core Design Contradiction:

Stability of the object's compositionVSStress or pressure

Solution Approach 1:

The patent applies local quality by creating a modulus gradient within the frame structure. The frame includes a first region with higher modulus and a second region with lower modulus, allowing different portions of the frame to serve different functions: the higher modulus region provides structural support and contraction resistance, while the lower modulus region reduces stress concentration at the interface with the stretching substrate.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by varying the modulus of elasticity across different regions of the frame. This gradient in mechanical properties allows the frame to transition from a uniform structure to one with spatially varying stiffness, optimizing both contraction resistance and stress distribution at the substrate-frame interface.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If the modulus of the frame is increased to reduce contraction, then structural stability improves, but adhesiveness between substrate and frame may deteriorate

Engineering Contradiction:

Improvestructural stabilityVSAvoidadhesiveness

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent applies local quality by creating a modulus gradient within the frame structure. The frame includes a first region with higher modulus and a second region with lower modulus, allowing different portions of the frame to serve different functions: the higher modulus region provides structural support and contraction resistance, while the lower modulus region reduces stress concentration at the interface with the stretching substrate.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by varying the modulus of elasticity across different regions of the frame. This gradient in mechanical properties allows the frame to transition from a uniform structure to one with spatially varying stiffness, optimizing both contraction resistance and stress distribution at the substrate-frame interface.

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If a rigid frame structure is used to maintain shape, then contraction is reduced, but reflectance at the outer peripheral portion increases

Engineering Contradiction:

Improveshape stabilityVSAvoidreflectance

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by creating a modulus gradient within the frame structure. The frame includes a first region with higher modulus and a second region with lower modulus, allowing different portions of the frame to serve different functions: the higher modulus region provides structural support and contraction resistance, while the lower modulus region reduces stress concentration at the interface with the stretching substrate.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by varying the modulus of elasticity across different regions of the frame. This gradient in mechanical properties allows the frame to transition from a uniform structure to one with spatially varying stiffness, optimizing both contraction resistance and stress distribution at the substrate-frame interface.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11502069B2Stretchable display device

Publication Date: 2022.11.15 LG DISPLAY CO LTD

AI summary

A stretchable display device includes a substrate structure which has a display area where images are displayed and a non-display area adjacent to the display area and includes an upper stretching substrate and a lower stretching substrate; and a frame which is disposed to cover a first side surface and a second side surface opposite to the first side surface, among a plurality of side surfaces of the substrate structure, in which a modulus of the frame is higher than moduli of the upper stretching substrate and the lower stretching substrate.