• Title/Summary/Keyword: printed electronics

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Scalable and Viable Paths to Printed (or Flexible) Electronics

  • Go, Byeong-Cheon
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2009.05a
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    • pp.3.2-3.2
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    • 2009
  • Development of printed electronics, which is occasionally referred to as 'flexible' or 'polymer' electronics, has attracted considerable world wide attention in recent years. Printed (or flexible) electronics is currently expected to represent a new form of electronics and open up wide ranging applications in displays, electron devices for medical use, sensors, and other areas. This presentation aims to provide a strategy for scalable and viable paths to accomplish flexible, printable, large area circuits displaying high performance. Novel approaches evolving from system on package (SoP) to system on flex (SoF) technology will allow the integration of heterogeneous materials platforms into a system which is needed to enhance the functionality of the system. The talk also includes speculations about areas on which future advances in printed electronics could have a substantial impact along with a brief introduction of the Korea Printed Electronics Association (KoPEA).

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A Study on Processing of TFT Electrodes for Digital Signage Display using a Reverse Offset Printing (리버스옵셋 프린팅을 이용한 디지털 사이니지 디스플레이용 TFT 전극 형성 공정 연구)

  • Yoon, Sun Hong;Lee, Junsang;Lee, Seung Hyun;Lee, Bum-Joo;Shin, Jin-Koog
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.6
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    • pp.497-504
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    • 2014
  • The digital signage display is actively researched as the next generation of large FPD. To commercialize those digital signage display, the manufacturing cost must be downed with printing method instead of conventional photolithography. Here, we demonstrate a reverse offset printed TFT electrodes for the digital signage display. For the fabricated source/drain and gate electrode, we used Ag ink, silicone blanket, Clich$\acute{e}$ and reverse offset printer. We printed uniform TFT electrode patterns with narrow line width(10 ${\mu}m$ range) and thin thickness(nm range). In the end the printing source/drain and gate electrode are successfully achieved by optimization of experimental conditions such as Clich$\acute{e}$ surface treatment, ink coating process, delay time, off/set process and curing temperature. Also, we checked that the printing align accuracy was within 5 ${\mu}m$.

Statistical Analysis for Thickness and Surface Roughness of Printed Pattern in Roll-to-Roll Printed Electronics System (롤투롤 인쇄전자 시스템에서 인쇄패턴의 두께와 표면조도에 관한 통계적 분석)

  • Lee, Chang Woo;Kim, Nam Seok;Kim, Chang Wan
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.3
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    • pp.287-294
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    • 2013
  • The roll-to-roll (R2R) printed electronics system is one of the most promising technologies for the printed electronics industry because of several advantages in terms of productivity and cost. In the R2R printed electronics system, the characteristics of the printed patterns are an important issue that determines the functional quality of the printed matter. This study analyzed how several main factors may affect the characteristics of printed patterns, especially the thickness and surface roughness. The statistical model for estimation of the printed pattern was developed as a function of the main factors using the design of experiment (DOE) methodology. Based on the statistical analysis results, the R2R printed electronics system can be designed to control the characteristics of printed patterns.

Measurement and Compensation of Synchronization Error in Offset Printing Process (오프셋 인쇄에서의 동기화 오차 정밀 계측 및 보정 연구)

  • Kang, Dongwoo;Kim, Hyunchang;Lee, Eonseok;Choi, Young-Man;Jo, Jeongdai;Lee, Taik-Min
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.6
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    • pp.477-481
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    • 2014
  • Flexible electronics have been to the fore because it is believed that flexibility can add incredible value such as light weight and mobility into the existing electronic devices and create new markets of large-area and low-cost electronics such as wearable eletronics in near future. Offset printing processes are regarded as major candidates for manufacturing the flexible electronics because they can provide the patterning resolution of micron-size effectively in large-area. In view of mechanics, the most important viewpoint in offset printing is how to achieve the synchronized movement of two contact surfaces in order to prevent slip between two contact surfaces and distortion of the blanket surface during ink transfer so that the high-resolution and good-overlay patterns can be printed. In this paper, a novel low-cost measurement method of the synchronization error using the motor control output signals is proposed and the compensation method is presented to minimize the synchronization error.

Improvement of Paper Smoothness for the Printed Electronics Base Paper (인쇄 전자 용지의 특성 구현을 위한 종이의 평활도 증가에 대한 연구)

  • Kim, Byong-Hyun;Yoo, Hee-Tae;Kang, Young-Ree
    • Journal of the Korean Graphic Arts Communication Society
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    • v.29 no.1
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    • pp.89-99
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    • 2011
  • The making of high leveled smoothness for the printed electronics base paper, wood pulp and sea algal pulp were mixed. If sea algal pulp contents is increased to 9%, the smoothness was moderately increased, and more effective in Softwood mixture than Hardwood, low freeness(high wetness) than high freeness(low wetness).

Effect of Micro Surface Structure on Printed Electronics (미세표면구조가 전자인쇄에 미치는 영향)

  • Kim, Seung-Hwan;Kang, Hyun-Wook;Lee, Kyung-Heon;Sung, Hyung-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.9
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    • pp.20-25
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    • 2010
  • The effect of micro surface structure on printing for printed electronics has been studied experimentally. The photolithography MEMS fabricationwass used to make a SU-8 molder which has micro structures on the surface, and the PDMS micro structure was fabricated by the PDMS molding method. In the aspect of printed electronics, we used silver paste conductive ink. We measured the surface energy variation on pillar microstructure. The microstructure was used to real printing experiment by a screen printing. We printed 1cm micro lines which have $30{\sim}250{\mu}m$ width, and checked the conductivity to sort out opened line pattern. Printability was defined by success probability of printed patterns and we found that the present microstructures improve the printability significantly.

Distortion of Printed Patterns in Printed Electronics (전자 인쇄에서의 인쇄 패턴 왜곡)

  • Kim, Chung-Hwan;Lee, Taik-Min;Kim, Dong-Soo;Choi, Byung-Oh
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.8 s.197
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    • pp.74-80
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    • 2007
  • The distortion of printed pattern is frequently observed in gravure offset printing process, which can be a serious problem in printing process for printed electronics. The mechanism of pattern distortion is studied and the factors which affect the amount and shape of distortion are found using FEM. The amount and shape of distortion is influenced by material properties of the roller, thickness of roller, applied load, and so on. As the printing pressure increases and Possion ratio increases, the degree of the image distortion increases. And the increase of the thickness of rubber roller brings a large distortion of image, too. In some cases, the distortion of printed pattern can reach a few hundred micromillimeters. The comparison of the experiment result and the simulation result shows good agreement in their quantitative tendency.

Measurement of Geometric Properties of Printed Patterns and Evaluation of their Printability (인쇄 패턴의 기하학적 특성 측정 및 인쇄성 평가)

  • Jeon, Sung Woong;Kim, Cheol;Park, Jong-Chan;Kim, Dong Soo;Kim, Chung Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.11
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    • pp.981-986
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    • 2014
  • Printed electronics devices are made of several sets of printed patterns. The quality or printability of the printed patterns determines the electrical performance of such devices. Moreover, control of the printability determines the reliability of such devices. Despite its importance, few studies have been reported for the measurement of the printed patterns to evaluate their printability. In this study, a measurement method is proposed for printed patterns, including the definition of the properties to be measured, and the related software is described. The proposed method measures the width, pinholes, and edge waviness and evaluates the printability of the patterns quantitatively. The proposed measurement method could be an efficient tool to evaluate and enhance the printability of printed patterns in printed electronics.