Stretchable Display Sink Patterns for Adhesive Overflow

Solution Overview

Problem

Stretchable display devices face degradation in extension rate and driving failure of light emitting diodes due to adhesive material overflow and permeation, which affects their flexibility and functionality.

Innovation Solution

The implementation of a stretchable display device design featuring a lower soft substrate with rigid first and second substrates, a planarization layer, and adhesive patterns with sink patterns to prevent adhesive material overflow and permeation, ensuring the extension rate and functionality are maintained.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If adhesive material is applied to attach light emitting diodes, then the light emitting diodes are securely fixed, but the adhesive material overflows and degrades the extension rate of the stretchable display device

Engineering Contradiction:

Improveattachment strengthVSAvoidextension rate

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The planarization layer is selectively removed only at specific locations to form sink patterns, creating localized adhesive retention zones. This allows adhesive material to be confined to specific areas where it is needed for attachment, while preventing overflow into regions that would restrict extension

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The sink pattern acts as an intermediary structure between the adhesive material and the surrounding planarization layer. It provides a designated space that captures and contains the adhesive material, mediating between the need for secure attachment and the need to maintain extension capabilities

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If adhesive material is applied to attach light emitting diodes, then the light emitting diodes are securely fixed, but the adhesive material permeates the side surface causing driving failure

Engineering Contradiction:

Improveattachment strengthVSAvoiddriving reliability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The planarization layer is selectively removed only at specific locations to form sink patterns, creating localized adhesive retention zones. This allows adhesive material to be confined to specific areas where it is needed for attachment, while preventing overflow into regions that would restrict extension

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The sink pattern acts as an intermediary structure between the adhesive material and the surrounding planarization layer. It provides a designated space that captures and contains the adhesive material, mediating between the need for secure attachment and the need to maintain extension capabilities

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If the planarization layer is completely covered with adhesive material for secure attachment, then attachment strength is improved, but the extension rate degradation increases

Engineering Contradiction:

Improveattachment strengthVSAvoidextension rate

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The planarization layer is selectively removed only at specific locations to form sink patterns, creating localized adhesive retention zones. This allows adhesive material to be confined to specific areas where it is needed for attachment, while preventing overflow into regions that would restrict extension

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The adhesive attachment area is segmented into discrete sink patterns rather than being continuous. This segmentation allows the adhesive to be effectively contained in specific zones, maintaining attachment strength while preserving extension capabilities in the surrounding areas

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11430773B2Stretchable display device

Publication Date: 2022.08.30 LG DISPLAY CO LTD

AI summary

In one or more embodiments of the present disclosure, a stretchable display device includes a base substrate having thereon a display area and a non-display area, a plurality of first substrates which is disposed on the display area and has a modulus larger than a modulus of the base substrate, at least one transistor formed on each of the plurality of first substrates, a planarization layer which covers the at least one transistor; at least one light emitting diode which is electrically connected to the at least one transistor and is formed on the planarization layer, and a plurality of adhesive patterns which is attached to each of the at least one light emitting diode, in which the planarization layer includes at least one first sink pattern formed at a side portion of the at least one light emitting diode. The stretchable display device according to the embodiments thereby suppresses the degradation of an extension rate of the stretchable display device.