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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
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Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh
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Fully transparent and rollable electronics.

Mallory Mativenga1, Di Geng, Byungsoon Kim

  • 1Advanced Display Research Center, Department of Information Display, Kyung Hee University , 26 kyungheedaero, Dongdaemun-gu, Seoul 130-701, Korea.

ACS Applied Materials & Interfaces
|December 20, 2014
PubMed
Summary

Researchers developed fully transparent and rollable thin-film transistors (TFTs) for flexible displays. These advanced TFTs overcome manufacturing challenges, offering high performance and durability for next-generation electronic devices.

Keywords:
amorphous oxide semiconductorflexiblerollablethin-film transistortransparent

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Area of Science:

  • Materials Science
  • Electronics Engineering
  • Optoelectronics

Background:

  • Manufacturing transparent and flexible display screens faces challenges with semiconductor/electrode materials, substrate temperature limits, and substrate warping.
  • Existing flexible electronics often compromise performance due to processing constraints and material limitations.

Purpose of the Study:

  • To fabricate and evaluate fully transparent and rollable thin-film transistor (TFT) circuits for advanced display applications.
  • To address key obstacles in producing durable, high-performance flexible electronic devices.

Main Methods:

  • Fabrication of TFTs using amorphous indium-gallium-zinc oxide semiconductor and amorphous indium-zinc oxide electrodes on 15-μm-thick colorless polyimide (CPI).
  • Utilized a carbon nanotube (CNT)/graphene oxide (GO) backbone for enhanced substrate handling and reduced adhesion to carrier glass.
  • Tested device performance under mechanical stress (rolling, bending) and electrostatic discharge (ESD).

Main Results:

  • Achieved >70% optical transmittance in the visible range with TFTs on flexible CPI substrates supporting >300 °C processing.
  • Demonstrated high TFT performance comparable to glass substrates (mobility: 12.7 ± 0.5 cm²/V·s) with stability after 100 rolling cycles and bending.
  • CNT/GO layer minimized wrinkling and reduced substrate tensile elongation, while ESD stability up to 10 kV was confirmed.

Conclusions:

  • Successfully developed transparent and rollable TFT circuits on flexible polyimide, overcoming major manufacturing hurdles for display applications.
  • The employed materials and fabrication techniques enable high-performance, durable, and easily detachable flexible electronic devices.
  • This advancement paves the way for next-generation flexible and transparent electronic displays and devices.