25.1: Tri‐Fold Flexible AMOLED with High Barrier Passivation Layers

Jimbo, Yasuhiro; Aoyama, Teruyoshi; Ohno, Naoto; Eguchi, S.; Kawashima, Susumu; Ikeda, Hisao; Hirakata, Yoichi; Yamazaki, Shunpei; Nakada, Masataka; Satô, Masataka; Yasumoto, Seiji; Bower, Chris; Cotton, Darryl; Matthews, Andrew; Andrew, Piers; Gheorghiu, Catalin; Bergquist, Johan

doi:10.1002/j.2168-0159.2014.tb00087.x

Cited by 60 publications

(42 citation statements)

References 13 publications

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“…Given the recent progresses achieved in the large-area integration of flexible devices, a relevant part of the review has focused on circuits, as well as on systems based on metal oxide semiconductor TFTs. Examples of novel large-area flexible electronic systems include flexible, textile-integrated, rollable and/or foldable optical displays, 39,40,127,158,175,176,203,214,310,316,[346][347][348][349][350][351][352] flexible and/or stretchable systems for temperature, 343 pH, 166,185 and x-ray sensing, 322,355,356 wireless power transmission, 81,315 as well as non-volatile storage and NFC transmission of data. 136,167,204,315 Despite the advances that flexible metal oxide semiconductor TFTs have witnessed in the last decade, there are still some bottlenecks that prevent the commercialization of this technology in new areas of application beyond optical displays.…”

Section: Discussionmentioning

confidence: 99%

Metal oxide semiconductor thin-film transistors for flexible electronics

Petti

Münzenrieder

Vogt

et al. 2016

Applied Physics Reviews

547

430

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Section: Discussionmentioning

confidence: 99%

Metal oxide semiconductor thin-film transistors for flexible electronics

Petti

Münzenrieder

Vogt

et al. 2016

Applied Physics Reviews

547

430

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“…Large displays are preferred for mobile devices; however, small displays are more portable. Foldable displays, which are size‐adjustable, offer a promising solution to the portability–practicality trade‐off . Various displaying modes, such as electronic paper, liquid crystal, and organic light‐emitting diodes (OLEDs), have been proposed for foldable displays .…”

Section: Introductionmentioning

confidence: 99%

A 5.5‐inch full HD foldable AMOLED display based on neutral‐plane splitting concept

et al. 2019

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Splitting of the mechanical neutral plane is a promising concept for foldable displays because it reduces the folding stress in each layer of the display. We verified the splitting concept experimentally and revealed a linear relation between the relative position of the neutral plane and the logarithm of the adhesive's elastic modulus. As the modulus decreased, the position of the neutral plane approached that of perfect splitting. On the basis of the neutral‐plane splitting concept, we developed 5.5‐inch full high‐definition foldable active matrix organic light‐emitting diode (AMOLED) displays, which endured 150 k inward folding cycles and 150 k outward folding cycles with folding radii of 3 and 5 mm, respectively. This study is expected to improve the flexibility of designing foldable AMOLED displays, enabling better balance of the portability versus practicality trade‐off in mobile displays.

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“…Unlike the previous report which demonstrated multi-foldable display with AMOLED [3], plastic substrates are adopted on both sides in this work. Color Filter (CF) part is fabricated using a transparent plastic substrate and AMOLED part is fabricated on the high-temperature-resistance plastic substrate.…”

Section: Objective and Backgroundmentioning

confidence: 91%

64.4L: Late‐News Paper: Symmetric Panel Stacking Design for Achieving 3mm Rolling Radius in Plastic‐based AMOLED Display

Lee

Wang

Chan

et al. 2015

Symp Digest of Tech Papers

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A 5" plastic-based AMOLED panel with optimal structure and optical design was fabricated. The panel is designed to coincide the OLED/TFT layer with the neutral plane and limit the largest strain of the outmost part to be less than 1%. Its performance remained prominent after repeated rolled at 3mm radius. Author KeywordsFlexible; rollable; foldable; AMOLED; plastic; neutal plane; symmetric panel stack Objective and BackgroundThe advancement of thin, light and flexible displays has been receiving great attention over the past decades. Due to high temperature requirement during the fabrication process, most of flexible panels demonstrated were fabricated on plastic substrates such as polyimide and PEN, etc. In recent years, we have also successfully demonstrated our capability to produce plastic-based EPD and AMOLED displays with fixed curve and down to certain bending conditions [1][2]. In addition to thinner feature compared to EPD, AMOLED's, intrinsic property including self-emission ability and high color production range as well as fast response time allows easy video viewing, providing a very wide range of its application possibilities in the near future. The plastic-based AMOLED panels have been commercialized on smartphones; however, the fixed curve appearance is far from satisfying customers' desire for a truly flexible device. Based on the marketing research, demand of truly flexible panels become desirous with rapid requirement of hand-on electronics like smartphones, tablets and wearable devices…etc.Currently, the commercial fixed-curve smartphones or watches were made of top-emission AMOLED combined with a layer of circular polarizer (CPL). The most common types of CPL is mainly composed of stretched PVA and retardation films with the overall thickness usually larger 140m. Therefore, the mechanical property of a CPL such as minimum bending radius is large and its rolling feasibility is limited. Meanwhile, the light efficiency is reduced to less than 50% and light leaking phenomena is found while panel is bent to curve. Therefore, we propose a new structure-symmetrical panel stack (SPS)-that allows us to produce a much thinner, softer plastic-based AMOLED panel without the employment of CPL in this study.Unlike the previous report which demonstrated multi-foldable display with AMOLED [3], plastic substrates are adopted on both sides in this work. Color Filter (CF) part is fabricated using a transparent plastic substrate and AMOLED part is fabricated on the high-temperature-resistance plastic substrate. The thickness and young's modules of each layer is carefully designed to achieve the most optimized mechanical properties. In addition, optical performance comparable to conventional AMOLED is obtained by employing full color RGB with anti-reflection layer (ARL) designed on the CF side. Because the SPS structure provides optimal mechanical properties, the proposed structure is expected to have little difficulty of achieving large-scale production in the future. Panel structure design and fabricat...

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25.1: Tri‐Fold Flexible AMOLED with High Barrier Passivation Layers

Cited by 60 publications

References 13 publications

Metal oxide semiconductor thin-film transistors for flexible electronics

Metal oxide semiconductor thin-film transistors for flexible electronics

A 5.5‐inch full HD foldable AMOLED display based on neutral‐plane splitting concept

64.4L: Late‐News Paper: Symmetric Panel Stacking Design for Achieving 3mm Rolling Radius in Plastic‐based AMOLED Display

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