Capacitor Reused Gate Driver for Compact In-Cell Touch Displays

A thin-film transistor (TFT) integrated gate driver is proposed for compact in-cell touch display, where one capacitor is reused for both turning on low-level maintaining transistors via voltage coupling and maintaining the re-start charge during the touch sensing period. The gate terminal of buffer...

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Bibliographic Details
Published in:IEEE journal of the Electron Devices Society 2021, Vol.9, p.533-538
Main Authors: Shen, Shuai, Liao, Congwei, Yang, Jiwen, Jiao, Hailong, Zhang, Shengdong
Format: Article
Language:English
Subjects:
bidirectional scanning
Capacitor reusing
Capacitors
display
Driver stages
Electrodes
gate driver
Gate drivers
in-cell touch
Logic gates
Semiconductor devices
Sensors
Thin film transistors
Touch
Transient response
Transistors
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Summary:A thin-film transistor (TFT) integrated gate driver is proposed for compact in-cell touch display, where one capacitor is reused for both turning on low-level maintaining transistors via voltage coupling and maintaining the re-start charge during the touch sensing period. The gate terminal of buffer transistor is thus free of electrical stress during touch sensing period, and can be re-charged for the subsequent re-start period, leading to minimal variations in the transient response. With the capacitor reusing scheme and a capacitor stacking structure, the area of the single stage gate driver is decreased to 645\,\,\mu \text{m}\,\,\times 210\,\,\mu \text{m} . The fabricated a-Si TFT gate driver with 8 cascaded stages shows that the rising and falling time variations among re-start and normal gate driver stages are less than 1~\mu \text{s} . Versatile touch sensing modes and bidirectional scanning functions are verified.
ISSN:2168-6734
2168-6734
DOI:10.1109/JEDS.2021.3077141