56‐3: Quantitative Evaluation of Neutral‐plane Splitting in Foldable Displays Using Folding Stiffness Measurements and Finite Element Method Simulations

Nishimura, Masaru; Hishinuma, Masatomo; Yamaguchi, Hideyo; Murayama, Akio

doi:10.1002/sdtp.13999

Cited by 2 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mechanical behavior was described by using the traction-separation law to obtain the relative material parameters [18]. Nishimura et al used folding stiffness measurements and FEM simulation to establish the relationship between the position of the split neutral layer and folding stiffness, with OCA material simplified as a linear elastic material [19]. Ma et al characterized the viscoelastic properties material with a stress relaxation test in the process of OLED bending modeling and simulation [20].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Constitutive Model Characterization of Optically Clear Adhesive in Flexible Devices

et al. 2022

View full text Add to dashboard Cite

Optically clear adhesive (OCA) has been widely used in flexible devices, where wavy stripes that cause troublesome long-term reliability problems often occur. The complex mechanical behavior of OCA should be studied, as it is related to the aforementioned problems. Therefore, it is necessary to establish reasonable mechanical constitutive models for deformation and stress control. In this work, hyperelastic and viscoelastic mechanical tests were carried out systematically and relative constitutive models of OCA material were established. We found that temperature has a great influence on OCA’s mechanical properties. The stress and modulus both decreased rapidly as the temperature increased. In the static viscoelasticity test, the initial stress at 85 °C was only 12.6 kPa, 57.4% lower than the initial stress at 30 °C. However, in the dynamic test, the storage modulus monotonically decreased from 1666.3 MPa to 0.6628 MPa as the temperature rose, and the decline rate reached the maximum near the glass transition temperature (Tg = 0 °C). The test data and constitutive models can be used as design references in the manufacturing process, as well as for product reliability evaluation.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Constitutive Model Characterization of Optically Clear Adhesive in Flexible Devices

et al. 2022

View full text Add to dashboard Cite

show abstract

Towards the optimal design of optically clear adhesives for flexible display

Park,

Kim,

Kim

et al. 2024

Soft Sci

View full text Add to dashboard Cite

As device form factors evolve towards increased complexity and flexibility, the role of adhesives within the display module stack becomes increasingly crucial. These adhesives are essential for bonding functional layers with minimal thickness while mitigating stress during the dynamic behavior of flexible devices. This paper offers a comprehensive overview of the essential properties of adhesives - such as adhesion, viscoelasticity, optical characteristics, and environmental reliability - necessary for the stable operation of flexible display devices across diverse form factors and environments. In particular, it provides an in-depth look at ongoing research in simulation, material selection, polymer network control, and the integration of new functionalities to achieve optimal performance. Furthermore, this paper discusses extensive research outcomes addressing the growing demand for sustainable solutions. Building on this knowledge, we highlight the future direction of adhesives for flexible displays.

show abstract

56‐3: Quantitative Evaluation of Neutral‐plane Splitting in Foldable Displays Using Folding Stiffness Measurements and Finite Element Method Simulations

Cited by 2 publications

References 9 publications

Mechanical Behavior and Constitutive Model Characterization of Optically Clear Adhesive in Flexible Devices

Mechanical Behavior and Constitutive Model Characterization of Optically Clear Adhesive in Flexible Devices

Towards the optimal design of optically clear adhesives for flexible display

Contact Info

Product

Resources

About