Sheet-Type Braille Displays by Integrating Organic Field-Effect Transistors and Polymeric Actuators

A large-area, flexible, and lightweight sheet-type Braille display has been successfully fabricated on a plastic film by integrating high-quality organic transistors and soft actuators. An array of rectangular plastic actuators is mechanically processed from a perfluorinated polymer electrolyte memb...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2007-02, Vol.54 (2), p.202-209
Main Authors: Kato, Yusaku, Sekitani, Tsuyoshi, Takamiya, Makoto, Doi, Masao, Asaka, Kinji, Sakurai, Takayasu, Someya, Takao
Format: Article
Language:English
Subjects:
Active matrix organic light emitting diodes
Actuators
Applied sciences
Braille
Braille display
Computer science
control theory
systems
Control theory. Systems
Devices
Display
Displays
Electrodes
Electronics
Exact sciences and technology
large-area electronics
Lightweight
organic transistor
Plastics
polymer actuator
Polymers
Robotics
Semiconductor devices
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Semiconductors
Surface treatment
tactile display
Transistors
Weight reduction
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Summary:A large-area, flexible, and lightweight sheet-type Braille display has been successfully fabricated on a plastic film by integrating high-quality organic transistors and soft actuators. An array of rectangular plastic actuators is mechanically processed from a perfluorinated polymer electrolyte membrane. A small semisphere, which projects upward from the rubberlike surface of the display, is attached to the tip of each rectangular actuator. The effective display size is 4times4 cm 2 . Each Braille letter consists of 3times2 dots and 24 letters; in other words, 6 letters times 4 lines can be displayed. Pentacene field-effect transistors with top-contact geometry have a channel length of 20 mum and a mobility of 1 cm 2 /Vmiddots. The Braille dots on one line are driven for 0.9 s. The total thickness and weight of the entire device are 1 mm and 5.3 g, respectively. The present scheme will enable people with visual impairments to carry the Braille sheet display in their pockets and read Braille e-books at any time. Since all the device components are manufactured on plastic films, these sheet-type Braille displays are mechanically flexible, lightweight, shock resistant, and potentially inexpensive to manufacture; therefore, they are suitable for mobile electronics
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2006.888678