Flexible and Stretchable Smart Display: Materials, Fabrication, Device Design, and System Integration

Koo, Ja Hoon; Kim, Dong Chan; Shim, Hyeong Joon; Kim, Sang Woo; Kim, Dae‐Hyeong

doi:10.1002/adfm.201801834

Cited by 442 publications

(289 citation statements)

References 199 publications

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“…[73][74][75] The most commonly used sensor materials are carbon nanotubes (CNTs), [76] graphene, [77] metal nanowires, [78] metal oxides, [79] 1D and 2D semiconductors, [80][81][82] organic polymers, [83][84][85] and so on. Namely, and the devices have a fast response time corresponding to the dynamic change of signal.…”

Section: Active Materialsmentioning

confidence: 99%

Recent Advances in Smart Wearable Sensing Systems

Lou

Wang

Shen

2018

Adv Materials Technologies

158

114

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a research field that integrates a highly diverse range of researchers and practitioners, including electronics, bioengineering, systems engineering, materials science, and other interdisciplinary expertise. [12][13][14][15] However, wearable sensors currently face great challenges because they are still in the initial stage of development. [16] For example, wearable sensors need to be integrated into the proper shape surfaces with compatibility, durability, and abrasion resistance. [17,18] Existing commercial wearable sensing devices are mainly implemented by encapsulating integrated circuits on rigid packaged solid substrates. But rigid packages are not mechanically compatible with soft and curved human bodies, resulting in unreliable measurement results due to measurement positions changed and unreliable skin contact. [19,20] In addition, smart wearable sensing requires complex sensing systems, which can complete a variety of functional electronic components, including data acquisition and processing, equipment operation control, intelligent data display, and self-powered operation.Despite these challenges, new SWSS with flexibility and stretchability has been evolved over the years as the ability to process large amounts of information in real time grows rapidly. [18,21,22] Flexible and stretchable electronic devices are emerging technologies that aim to fabricate electronic circuits on "soft" substrates to achieve mechanical flexibility and stretchable of sensor components, making it possible to construct SWSS with unique characteristics, such as great conformability, excellent stretchability, low cost, and low weight. [23] Flexible sensors can capture target analytes more effectively and produce high-quality signals, while the traditional ones are unable to capture poor quality signal transduction analytes due to their rigidity hindering. [24] In particularly, users can perceive their surroundings in a convenient, effective, and timely manner with the SWSS help. In recent years, the focus on the construction of ultrathin flexible and stretchable sensors has prompted emerging applications of SWSS. [25][26][27][28] Meanwhile, the development of SWSS has become a revolutionary process in sensing technology. In general, the key factor of the SWSS is to respond quickly and accurately to the detection target and then transmit the processed data to the user in an easy to operate display mode. [18] However, despite the rapid growth of wearable and flexible sensing technologies, few SWSSs appear on the market due to their inherent limitations. Therefore, a comprehensive review and systematic summary of the latest technology in the development of SWSS will be beneficial for the entire field.Wearable technology with widespread public attention has generated tremendous economic and social impact, resulting in changes in healthcare procedures and personal lifestyle. Smart wearable sensing systems, as an important type of device in wearable technology which can detect various stimuli relevant to biological species or spe...

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Section: Active Materialsmentioning

confidence: 99%

Recent Advances in Smart Wearable Sensing Systems

Lou

Wang

Shen

2018

Adv Materials Technologies

158

114

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“…Electronic companies have recently announced foldable smart phones that change their display size by folding motion and rollable TVs. Furthermore, other electronic devices, including semiconductor,1–3 battery,4–6 and sensors,7–9 are evolving toward flexible electronics that achieve high portability, low weight, and mechanical robustness against mechanical impact. Those flexible electronics will be operated with accompanying repeated mechanical deformations, such as bending, rolling, and twisting.…”

Section: Introductionmentioning

confidence: 99%

In Twisting Motion, Stress‐Free Zone of Wearable Electronics

Kwon

Lee

Joo

et al. 2020

Adv Elect Materials

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Flexible electronics, such as flexible displays, batteries, and sensors, are under active development, and their mechanical reliability under repeated mechanical deformations is receiving a lot of attention. The mechanical stress under simple bending has been widely investigated, and the neutral plane located tensile and compressive region has been suggested for stress‐free zone under bending. However, to develop highly reliable twistable electronics, it is essential to elucidate the stress evolution during complex twisting deformation, and determine the stress‐free zone in twisting. The mechanical reliability of flexible indium tin oxide and Cu patterns during repeated twisting motions is reported. For fixed twisting, the patterns at the center show higher stability, but for free twisting, the patterns at the edge exhibit superior mechanical reliability. The mechanical stress evolution in twisting motion is analyzed by finite element method simulation, and the stress‐free zone according to twisting motion and base is proposed. Finally, the stress‐free zone is verified by conducting real twisting tests, such as the twisting motion of the human body. This study based on experimental reliability testing and computational simulation can provide guidelines to develop highly reliable twisting electronics.

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“…In order to realize such a complete foldable and deformable display, the display must finally be stretchable [2][3]. However, if the size of the AMOLED panel changes, there may arise problems such as a change in the characteristics of the electrodes and TFTs inside the gate driver [4][5][6]. If such a problem occurs, there is a problem that the OLED cannot emit uniform brightness.…”

Section: Introductionmentioning

confidence: 99%