Journal of Information Display

The Korean Infomation Display Society (한국정보디스플레이학회)
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Printed flexible OTFT backplane for electrophoretic displays

  • Ryu, Gi-Seong (Department of Electronics Engineering, Dong-A University) ;
  • Lee, Myung-Won (Department of Electronics Engineering, Dong-A University) ;
  • Song, Chung-Kun (Department of Electronics Engineering, Dong-A University)
  • Received : 2011.07.17
  • Accepted : 2011.08.10
  • Published : 2011.12.31
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Abstract

Printing technologies were applied to fabricate a flexible organic thin-film transistor (OTFT) backplane for electrophoretic displays (EPDs). Various printing processes were adopted to maximize the figures of each layer of OTFT: screen printing combined with reverse offset printing for the gate electrodes and scan bus lines with Ag ink, inkjet for the source/drain electrodes with glycerol-doped Poly (3,4-ethylenedioxythiophene): Poly (styrenesulfonate) (PEDOT:PSS), inkjet for the semiconductor layer with Triisopropylsilylethynyl (TIPS)-pentacene, and screen printing for the pixel electrodes with Ag paste. A mobility of $0.44cm^2/V$ s was obtained, with an average standard deviation of 20%, from the 36 OTFTs taken from different backplane locations, which indicates high uniformity. An EPD laminated on an OTFT backplane with $190{\times}152$ pixels on an 8-in panel was successfully operated by displaying some patterns.

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References

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