Flexible Display Panel Adhesive Layer Impact Resistance
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Solution Overview
Problem
Flexible display panels used in devices like smartphones and tablets lack sufficient impact resistance to withstand contacts from writing instruments or fingers.
Innovation Solution
A flexible display panel configuration that includes an electroluminescence (EL) structure layer, a foamed resin layer on the opposite side of the light emitting surface, a metal layer between the EL structure layer and the foamed resin layer, and adhesive layers with specific elastic moduli to enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective sheets are added on both sides of the display panel, then impact resistance is improved, but device complexity increases
Solution Approach 1:
The patent applies composite materials by combining a metal layer with a foamed resin layer to create a composite structure that provides both rigidity and shock absorption. The metal layer (e.g., aluminum or stainless steel) offers structural strength, while the foamed resin layer provides cushioning against impacts. This composite approach achieves improved impact resistance without simply adding separate protective sheets, thereby managing device complexity more effectively.
Solution Approach 2:
The patent implements local quality by positioning the metal layer and foamed resin layer specifically at the back of the display panel where impact forces are most likely to occur. The foamed resin layer is placed in direct contact with the EL structure layer to provide localized shock absorption, while the metal layer provides localized reinforcement. This targeted approach improves impact resistance at critical areas without unnecessarily complicating the entire device structure.
2Reliability
If a metal layer and foamed resin layer are added to the display panel, then impact resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the metal layer and foamed resin layer into a single integrated assembly that is attached to the back of the display panel. Rather than manufacturing and assembling these components separately in multiple steps, the design allows them to be combined as one unit, simplifying the manufacturing process. The adhesive layer bonds both materials together in a single operation, reducing the number of manufacturing steps while maintaining the dual functionality of structural support and shock absorption.
Solution Approach 2:
The metal layer and foamed resin layer assembly serves multiple functions simultaneously: it provides structural support, shock absorption, and even acts as a mounting interface for the display panel. The adhesive layer not only bonds the layers together but also provides a mounting surface. This multi-functionality reduces the need for additional separate components and manufacturing steps, thereby easing manufacturing complexity while achieving improved impact resistance.
3Reliability
If adhesive with high elastic modulus is used between EL structure layer and metal layer, then impact resistance is improved, but flexibility may be reduced
Solution Approach 1:
The patent applies parameter changes by carefully selecting the elastic modulus of the adhesive layer to be within a specific range (10 MPa to 1000 MPa, preferably 50 MPa to 500 MPa). This optimized parameter range allows the adhesive to provide sufficient bonding strength and impact resistance while maintaining enough flexibility to accommodate the bending and flexibility requirements of the display panel. By precisely controlling this physical parameter, the patent resolves the contradiction between impact resistance and flexibility.
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 described configuration significantly improves the impact resistance of the display panel, allowing it to withstand impacts from writing instruments and fingers without sustaining damage.
Implementation Method 1
a first adhesive layer provided between the EL structure layer and the metal layer and comprises an adhesive having an elastic modulus of 90 kPa or more
Implementation Method 2
a foamed resin layer on a side of the EL structure layer that is opposite to a light emitting surface of the EL structure layer
Data Source
AI summary
The display panel is a display panel that is flexible, including: an EL structure layer including a plurality of EL elements arranged two-dimensionally; a foamed resin layer on a side of the EL structure layer that is opposite to a light emitting surface of the EL structure layer; a metal layer provided between the EL structure layer and the foamed resin layer; and a first adhesive layer provided between the EL structure layer and the metal layer and comprises an adhesive having an elastic modulus of 90 kPa or more.