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Flexible IGZO TFT Spice model and design of active strain-compensation circuits for bendable active matrix arrays

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posted on 2023-06-09, 14:19 authored by Wan Muhammad Hilmi bin Wan Zaidi, Julio Costa, Arash Pour Yazdan Panah Kermani, Wan Fazlida Hanim Abdullah, Niko Munzenrieder
The detailed measurement and characterization of strain induced performance variations in flexible InGaZnO thinfilm transistors (TFTs) resulted in a Spice TFT model able to simulate tensile and compressive bending. This model was used to evaluate a new concept, namely the active compensation of strain induced performance variations in pixel driving circuits for bendable active matrix arrays. The designed circuits can compensate the mobility and threshold voltage shifts in IGZO TFTs induced by bending. In a single TFT, a drain current of 1 mA varies by 83 µA per percent of mechanical strain. The most effective compensation circuit design, comprising one additional TFT and two resistors, reduces the driving current variation to 1.1 µA per percent of strain. The compensation circuit requires no additional control signals, and increases the power consumption by only 235 µW (corresponds to 4.7 %). Finally, switching operation is possible for frequencies up to 200 kHz. This opens a way towards the fabrication of flexible displays with constant brightness even when bent.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

IEEE Electron Device Letters

ISSN

0741-3106

Publisher

Institute of Electrical and Electronics Engineers

Issue

9

Volume

39

Page range

1314-1317

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Sensor Technology Research Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-08-02

First Open Access (FOA) Date

2018-08-02

First Compliant Deposit (FCD) Date

2018-07-31

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