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Top‐emission AMOLED display driven by organic TFTs with semiconductor layer patterned by inkjet process
Author(s) -
Okumoto Yuko,
Ukeda Takaaki,
Matsui Masafumi,
Okumoto Kenji,
Miyamoto Akihito,
Morita Kiyoyuki
Publication year - 2012
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1002/jsid.108
Subject(s) - amoled , materials science , optoelectronics , thin film transistor , organic semiconductor , oled , flexible display , layer (electronics) , threshold voltage , active layer , transistor , luminance , semiconductor , substrate (aquarium) , active matrix , voltage , nanotechnology , optics , electrical engineering , oceanography , physics , geology , engineering
Abstract We have developed an inkjet process for laying down an organic semiconductor layer in organic thin‐film transistors (OTFTs). The organic semiconductor crystallinity was improved by adjusting the contact angles of the bank, the gate insulator, and the source/drain electrodes. The threshold voltage of the OTFT was controlled by means of several surface treatments of the silicon dioxide gate insulator. The OTFTs showed a high mobility of 2.5 cm 2 /Vs and uniform threshold voltages of −0.4 ± 0.7 V. We also fabricated a 4‐in., 80‐ppi active‐matrix organic light‐emitting diode on a glass substrate that showed good luminance uniformity and high moving picture quality.