A 4 V operation, flexible braille display using organic transistors, carbon nanotube actuators, and organic static random-access memory

Kenjiro Fukuda, Tsuyoshi Sekitani, Ute Zschieschang, Hagen Klauk, Kazunori Kuribara, Tomoyuki Yokota, Takushi Sugino, Kinji Asaka, Masaaki Ikeda, Hirokazu Kuwabara, Tatsuya Yamamoto, Kazuo Takimiya, Takanori Fukushima, Takuzo Aida, Makoto Takamiya, Takayasu Sakurai, Takao Someya

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)

Abstract

A sheet-type Braille display operating at 4 V has been successfully fabricated by integrating organic an static random-access memory (SRAM) array with carbon nanotube (CNT)-based actuators that are driven by organic thin-film transistors (control-TFTs). The on current of organic control-TFTs that drive CNT actuators exceeds 3 mA, the mobility exceeds 1cm2 V -1s-1 , and the on/off ratio exceeds 105 at an operational voltage of 3 V. By adjusting the process time for the formation of the aluminum oxide dielectrics, the threshold voltage of the organic TFTs can be systematically controlled. This technique leads to an improved static noise margin of the SRAM and enables its stable operation with a short programming time of 2 ms at a programming voltage of 2 V. As a demonstration of the operation of one actuator with one control-TFT and SRAM: the displacement of actuator exceeds 300μm at an operation voltage of 4 V, which is large enough for a blind person to recognize the pop-up of braille dots. Integrating the SRAM array reduces the frame rate of a 12 dot × 12 dot display from 1/21.6 s to 1/2.9 s.

Original languageEnglish
Pages (from-to)4019-4027
Number of pages9
JournalAdvanced Functional Materials
Volume21
Issue number21
DOIs
Publication statusPublished - 2011 Nov 8
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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