Foldable AMOLED Display Development: Progress and Challenges

Yan, Jingye; Ho, Jia-Chong; Chen, Janglin

doi:10.1002/j.2637-496x.2015.tb00780.x

Cited by 15 publications

(15 citation statements)

References 10 publications

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“…Because these FDs are under various stress states including tensile, compression, and bending6789, the developers of FDs have used the threshold ROC of FDs as an electrical failure criterion1610111213. These threshold ROCs, at which the electrical resistance increases over 10%, have been reduced from 10 mm for bendable displays to less than 5–3 mm for rollable and foldable displays, respectively1131415. As the technology trend toward reducing ROCs in futuristic FD’s, we are encountering material challenge that prevents from the electrical and mechanical degradation of flexible electrodes under strain-dependent deformations9161718.…”

mentioning

confidence: 99%

Failure criterion of silver nanowire electrodes on a polymer substrate for highly flexible devices

Kim

et al. 2017

Sci Rep

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Nanomechanical characteristics of standalone silver nanowires (Ag NWs) are a key issue for providing a failure criterion of advanced flexible electrodes that are trending towards smaller radius of curvatures (ROCs). Through in-situ tensile and buckling tests of pentagonal Ag NWs, we demonstrated that the intrinsic fracture strain provides a significant criterion to predict the mechanical and electrical failure of Ag NW electrodes under various strain modes, because the decrease in fracture strain limits figure of merit of flexible devices. The Ag NW electrodes on a polymer substrate exhibited a strain-dependent electrical failure owing to the unique deformation characteristics with a size-dependent brittle-to-ductile transition of the five-fold twinned Ag NWs. All the Ag NWs greater than approximately 40 nm in diameter exhibited brittle fracture with a size-independent stress-strain response under tensile and buckling modes, which leads to the electrical failure of flexible electrodes at the almost same threshold ROC. Meanwhile, the higher ductility of Ag NWs less than 40 nm in diameter resulted in much smaller threshold ROCs of the electrodes due to the highly extended fracture strains, which can afford a high degree of freedom for highly flexible devices.

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mentioning

confidence: 99%

Failure criterion of silver nanowire electrodes on a polymer substrate for highly flexible devices

Kim

et al. 2017

Sci Rep

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“…Several approaches for flexible substrates and TFT processing on flexible substrates have been explored [12][13][14]. A successful flexible TFT backplane fabrication strategy, employed by majority of the developers is based on in-situ plastic substrate fabrication [12][13][14], as illustrated in Figure 5.…”

Section: Flexible Substrates and Tft Processingmentioning

confidence: 99%

“…A successful flexible TFT backplane fabrication strategy, employed by majority of the developers is based on in-situ plastic substrate fabrication [12][13][14], as illustrated in Figure 5. This strategy involves solution coating a low-TCE (thermal coefficient of expansion) polyimide (PI) film on a glass substrate with a sacrificial layer.…”

Section: Flexible Substrates and Tft Processingmentioning

confidence: 99%

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Recent progress in OLED and flexible displays and their potential for application to aerospace and military display systems

Sarma

2015

Display Technologies and Applications for Defense, Security, and Avionics IX; And Head- And Helmet-Mounted Displays XX

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Organic light emitting diode (OLED) display technology has advanced significantly in recent years and it is increasingly being adapted in consumer electronics products with premium performance, such as high resolution smart phones, Tablet PCs and TVs. Even flexible OLED displays are beginning to be commercialized in consumer electronic devices such as smart phones and smart watches. In addition to the advances in OLED emitters, successful development and adoption of OLED displays for premium performance applications relies on the advances in several enabling technologies including TFT backplanes, pixel drive electronics, pixel patterning technologies, encapsulation technologies and system level engineering. In this paper we will discuss the impact of the recent advances in LTPS and AOS TFTs, R, G, B and White OLED with color filter pixel architectures, and encapsulation, on the success of the OLEDs in consumer electronic devices. We will then discuss potential of these advances in addressing the requirements of OLED and flexible displays for the military and avionics applications.

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“…However, these layers are easily damaged by minor deformations and lose their functions because they are fragile in common [39]. To avoid this problem, the materials that have low modulus are used to absorb stress, and structural design to place these parts in the neutral plane is applied [40]. When the display composed with multilayers is bent, tensile or compressive deformation occurs depending on the position, but for each design, the layer at a particular position is simply bent without such deformation.…”

Section: Stress Dispersion and Neutral Planementioning

confidence: 99%

Pressure-Sensitive Adhesives for Flexible Display Applications

Lee¹,

Kim²,

Lee³

et al. 2020

Hybrid Nanomaterials - Flexible Electronics Materials

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Pressure-sensitive adhesives (PSA) have been used in electronics for not only attachment of two materials but also shock absorption, thermal and electrical conductivity, electromagnetic shielding, and optical property. Optically clear adhesives (OCA) have been used as a core material for optical performance of display. In addition to basic properties of OCA such as adhesion strength, transmittance, haze, and reliability, it has required dielectric constant, gap filling, and anticorrosion according to a substrate. However, the structural and functional changes of flexible display bring challenges to OCA that protects vulnerable components such as thin-film transistor, OLED, and thin-film encapsulation by stress dispersion and adjustment of a neutral plane. At the same time, flexibility and existing properties are essential. In this chapter, the development of components and performance of OCA, and evaluation methods will be discussed.

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Foldable AMOLED Display Development: Progress and Challenges

Cited by 15 publications

References 10 publications

Failure criterion of silver nanowire electrodes on a polymer substrate for highly flexible devices

Failure criterion of silver nanowire electrodes on a polymer substrate for highly flexible devices

Recent progress in OLED and flexible displays and their potential for application to aerospace and military display systems

Pressure-Sensitive Adhesives for Flexible Display Applications

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