Flexible Display Adhesive with Varying Elastic Moduli
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Solution Overview
Problem
Existing display devices have a significant non-display area that hinders their slimness and reliability, as they require a substantial space for pads and driving circuits, which affects their flexibility and visual appearance.
Innovation Solution
A display device design featuring a flexible base layer with a first and second portion, a display unit on the first portion, a driving circuit on the second portion, and an adhesive member with varying elastic moduli, where a higher elastic modulus adhesive overlaps the driving circuit for enhanced stability and reduced non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a substantial space is allocated for pads and driving circuits, then the driving circuit connections are stable, but the non-display area increases and flexibility is reduced
Solution Approach 1:
The adhesive member is divided into two portions with different elastic moduli: a first portion with lower elastic modulus for general adhesion and a second portion with higher elastic modulus positioned at the driving circuit region. This segmentation allows the adhesive structure to provide both flexibility in the display area and enhanced stability at the driving circuit location, resolving the contradiction between connection stability and non-display area reduction.
2Reliability
If a substantial space is allocated for pads and driving circuits, then the driving circuit connections are stable, but the flexibility of the display device is reduced
Solution Approach 1:
The adhesive member exhibits local quality variation through different elastic moduli in different regions. The first portion has lower elastic modulus to maintain overall flexibility, while the second portion has higher elastic modulus to provide localized stability at the driving circuit region. This local differentiation resolves the contradiction between connection stability and device flexibility.
3Area of moving object
If the non-display area is reduced, then the display device becomes slimmer and more compact, but the reliability of driving circuit connections deteriorates
Solution Approach 1:
The elastic modulus parameter of the adhesive member is changed spatially to resolve the contradiction. By positioning a higher elastic modulus adhesive at the driving circuit region while maintaining lower elastic modulus in other areas, the design achieves compact non-display area without compromising connection reliability. This parameter variation allows the adhesive to provide both compactness and stability.
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 design reduces the non-display area, improves the reliability of the display device by stabilizing the driving circuit connections and maintaining flexibility, allowing for a more compact and robust display device.
Implementation Method 1
an adhesive member disposed between the flexible base layer and the support member
Implementation Method 2
a display unit disposed on a first surface of the first portion and including a light emitting element
Data Source
AI summary
A display device includes a base layer including a first portion and a second portion disposed around the second portion; a display unit disposed on a first surface of the first portion and including a light emitting element; a driving circuit disposed on a first surface of the second portion and including a driving chip; a support member attached to a second surface of the first portion and a second surface of the second portion; and an adhesive member disposed between the base layer and the support member, wherein the adhesive member includes a first adhesive member having a first elastic modulus and a second adhesive member having a second elastic modulus that is higher than the first elastic modulus, and the second adhesive member overlaps the driving circuit.