REVIEW

Mechanisms of Negative Capacitance in Organic Light-Emitting Diodes: A Review
Byeongyun Kim , Donghyun Ko , Jaesang Lee
J. Flex. Print. Electron. 2026;5(1):1-19.
https://doi.org/10.56767/jfpe.250027
Negative capacitance (NC) in organic light-emitting diodes (OLEDs) has emerged as a sensitive probe of non-equilibrium charge dynamics, yet its physical origin remains under active debate. This review provides a comprehensive overview of NC in OLEDs, focusing on how it arises from delayed and imbalanced charge responses under electrical modulation. We first summarize how NC manifests in capacitance–voltage, capacitance–frequency, Nyquist, and Bode plots, and outline the theoretical frameworks used to extract capacitance from impedance and t...

REVIEW

Quantum Dot Patterning Techniques for High-Resolution AR/VR Displays
초고해상도 AR/VR 디스플레이를 위한 양자점 패터닝 기술
Junhyeok Park , Soong Ju Oh
박준혁, 오승주
J. Flex. Print. Electron. 2026;5(1):21-33.
https://doi.org/10.56767/jfpe.250024

REVIEW

Recent Advances in Soft Electromagnetic Devices for Wearable Applications
웨어러블 응용을 위한 소프트전자기파 소자 기술 동향
Hoon Yeub Jeong
정훈엽
J. Flex. Print. Electron. 2026;5(1):35-50.
https://doi.org/10.56767/jfpe.260004

REVIEW

Recent Advances in AI-Driven Inkjet Printing
Seongju Kim
J. Flex. Print. Electron. 2026;5(1):51-67.
https://doi.org/10.56767/jfpe.260005
The inkjet printing process requires an understanding of the physical behavior that governs droplet generation, deposition, and film formation. Artificial intelligence (AI) is becoming a key technology for the inkjet printing technologies by extracting meaningful patterns in relationships between complicated features. This review summarizes recent AI-based methodologies for jetting behavior prediction, abnormal jetting detection, waveform optimization, process monitoring, and film formation control. The remaining challenges and future opportuni...

REVIEW

Printed Graphene-Based Interconnects and Vias for Flexible Hybrid Electronics
Ganapathi Bharathi , Seongin Hong
J. Flex. Print. Electron. 2026;5(1):69-106.
https://doi.org/10.56767/jfpe.260006
Graphene-based inks are emerging as a mechanically resilient alternative to silver and copper nanoparticle systems for printed interconnects in flexible hybrid electronics (FHE). Unlike brittle metallic films, graphene flake networks survive repeated bending through crack bridging and percolation reconfiguration. However, the intrinsic-to-practical conductivity gap remains the central challenge: inter-flake junction resistance places printed film conductivity orders of magnitude below bulk metals. This review examines graphene ink formulation, ...

RESEARCH

Hydrogel-Piezoelectric Bilayer Thin Film for Wireless Biochemical Sensing
Sophia Selvarajan , Alba Lako , Albert Kim
J. Flex. Print. Electron. 2026;5(1):107-117.
https://doi.org/10.56767/jfpe.250020
We present a hydrogel–fractal piezoelectric bilayer transducer for wireless biochemical sensing. The device combines a pH-responsive chemomechanical hydrogel with a perforated piezoelectric membrane to enable deformation-mediated signal transduction. The proposed scheme utilizes the piezoelectric element as a wireless transducer and the swelling/shrinking of hydrogels as a sensing element. Fractal patterning of the piezoelectric layer increases mechanical compliance and supports multi-mode vibration, resulting in improved bandwidth and linear...

RESEARCH

Direct Ink Writing–Based Fabrication and Evaluation of Customized High-Density Surface Electromyography Electrode Arrays for Hand Gesture Classification
직접 잉크 쓰기 기반 맞춤형 고밀도 표면근전도 전극 배열 제작 및 손동작 분류 성능 평가
Ui-In Lee , Taeha Kim , Hyeju Roh , Junghun Sung , Woongki Hong , Hongki Kang
이의인, 김태하, 노혜주, 성정훈, 홍웅기, 강홍기
J. Flex. Print. Electron. 2026;5(1):119-134.
https://doi.org/10.56767/jfpe.250025

RESEARCH

Localized Black Polyimide Absorbers for Low-Reflectance Ag Metal Mesh Electrodes
Ji-Sub Park , Jun-Young Jeon , Hak-Rin Kim , Jun-Chan Choi
J. Flex. Print. Electron. 2026;5(1):135-143.
https://doi.org/10.56767/jfpe.260003
Flexible transparent conducting electrodes based on metal mesh structures can achieve low sheet resistance but often exhibit visible reflection from the metallic lines. Here, we introduce a localized black polyimide (BPI) light absorption layer near the Ag mesh lines to reduce metal-induced reflection while preserving the essential electrode characteristics. The BPI layer, consisting of carbon-black-dispersed polyimide, was patterned by combining thermal imprinting with Ag nanoparticle ink filling, thermal treatment, and selective etching, ther...

RESEARCH

Low-voltage Operation Solution-Processed Thin Film Transistors with Various Dielectrics
게이트 절연막 제어를 통한 저전압 구동 용액공정 박막 트랜지스터 구현
Yongju Lee , Hyeok Kim
이용주, 김혁
J. Flex. Print. Electron. 2026;5(1):145-151.
https://doi.org/10.56767/jfpe.260007

RESEARCH

Effect of PR-Based Pixel-Defining Structures on the Angular Luminance Distribution of Small-Sized OLED Pixels
PDL 구조의 유무에 따른 소형 OLED 픽셀의 휘도 분포 분석
Seo-Yoon Bae , Hanna You , Sung-Min Lee
배서윤, 유한나, 이성민
J. Flex. Print. Electron. 2026;5(1):153-160.
https://doi.org/10.56767/jfpe.260008

Articles

Online Articles  91

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REVIEW

Mechanisms of Negative Capacitance in Organic Light-Emitting Diodes: A Review
Byeongyun Kim , Donghyun Ko , Jaesang Lee
J. Flex. Print. Electron. 2026;5(1):1-19.
https://doi.org/10.56767/jfpe.250027
HTML PDF PubReader
Quantum Dot Patterning Techniques for High-Resolution AR/VR Displays
초고해상도 AR/VR 디스플레이를 위한 양자점 패터닝 기술
Junhyeok Park , Soong Ju Oh
박준혁, 오승주
J. Flex. Print. Electron. 2026;5(1):21-33.
https://doi.org/10.56767/jfpe.250024
HTML PDF PubReader
Recent Advances in Soft Electromagnetic Devices for Wearable Applications
웨어러블 응용을 위한 소프트전자기파 소자 기술 동향
Hoon Yeub Jeong
정훈엽
J. Flex. Print. Electron. 2026;5(1):35-50.
https://doi.org/10.56767/jfpe.260004
HTML PDF PubReader
Recent Advances in AI-Driven Inkjet Printing
Seongju Kim
J. Flex. Print. Electron. 2026;5(1):51-67.
https://doi.org/10.56767/jfpe.260005
HTML PDF PubReader
Printed Graphene-Based Interconnects and Vias for Flexible Hybrid Electronics
Ganapathi Bharathi , Seongin Hong
J. Flex. Print. Electron. 2026;5(1):69-106.
https://doi.org/10.56767/jfpe.260006
HTML PDF PubReader

RESEARCH

Hydrogel-Piezoelectric Bilayer Thin Film for Wireless Biochemical Sensing
Sophia Selvarajan , Alba Lako , Albert Kim
J. Flex. Print. Electron. 2026;5(1):107-117.
https://doi.org/10.56767/jfpe.250020
HTML PDF PubReader
Direct Ink Writing–Based Fabrication and Evaluation of Customized High-Density Surface Electromyography Electrode Arrays for Hand Gesture Classification
직접 잉크 쓰기 기반 맞춤형 고밀도 표면근전도 전극 배열 제작 및 손동작 분류 성능 평가
Ui-In Lee , Taeha Kim , Hyeju Roh , Junghun Sung , Woongki Hong , Hongki Kang
이의인, 김태하, 노혜주, 성정훈, 홍웅기, 강홍기
J. Flex. Print. Electron. 2026;5(1):119-134.
https://doi.org/10.56767/jfpe.250025
HTML PDF PubReader
Localized Black Polyimide Absorbers for Low-Reflectance Ag Metal Mesh Electrodes
Ji-Sub Park , Jun-Young Jeon , Hak-Rin Kim , Jun-Chan Choi
J. Flex. Print. Electron. 2026;5(1):135-143.
https://doi.org/10.56767/jfpe.260003
HTML PDF PubReader
Low-voltage Operation Solution-Processed Thin Film Transistors with Various Dielectrics
게이트 절연막 제어를 통한 저전압 구동 용액공정 박막 트랜지스터 구현
Yongju Lee , Hyeok Kim
이용주, 김혁
J. Flex. Print. Electron. 2026;5(1):145-151.
https://doi.org/10.56767/jfpe.260007
HTML PDF PubReader
Effect of PR-Based Pixel-Defining Structures on the Angular Luminance Distribution of Small-Sized OLED Pixels
PDL 구조의 유무에 따른 소형 OLED 픽셀의 휘도 분포 분석
Seo-Yoon Bae , Hanna You , Sung-Min Lee
배서윤, 유한나, 이성민
J. Flex. Print. Electron. 2026;5(1):153-160.
https://doi.org/10.56767/jfpe.260008
HTML PDF PubReader

Ahead of print Articles  View more

Review Article

Stretchable Organic Photodetectors: From Structural to Intrinsic Design
Hyunbum Kang
J. Flex. Print. Electron. 2026 [published online ahead of print: Jun 24, 2026]
https://doi.org/10.56767/jfpe.260001
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REVIEW

Printed Graphene-Based Interconnects and Vias for Flexible Hybrid Electronics
Ganapathi Bharathi , Seongin Hong
J. Flex. Print. Electron. 2026;5(1):69-106.
https://doi.org/10.56767/jfpe.260006
HTML PDF PubReader

REVIEW

Recent Progress in Organic-Based Photonic Synapses
Gyu-min Ko, Seungbeom Lee, Minjun Choi, Hea-Lim Park
J. Flex. Print. Electron. 2022;1(2):155-173.
https://doi.org/10.56767/jfpe.2022.1.2.155
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Cited by Crossref 8

REVIEW

Recent Advances in AI-Driven Inkjet Printing
Seongju Kim
J. Flex. Print. Electron. 2026;5(1):51-67.
https://doi.org/10.56767/jfpe.260005
HTML PDF PubReader

REVIEW

Recent Advancements in Flexible Biosensors for Continuous Glucose Monitoring
Junghyun Cho, Yunyoung Jang, Jayoung Kim, In-Seon Lee, Wonryung Lee
J. Flex. Print. Electron. 2024;3(1):47-64.
https://doi.org/10.56767/jfpe.2024.3.1.47
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Cited by Crossref 3

REVIEW

Mechanisms of Negative Capacitance in Organic Light-Emitting Diodes: A Review
Byeongyun Kim , Donghyun Ko , Jaesang Lee
J. Flex. Print. Electron. 2026;5(1):1-19.
https://doi.org/10.56767/jfpe.250027
HTML PDF PubReader




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June, 2026
Vol. 5, No. 1

eISSN:2951-2174


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