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A fully integrated 1‐in. AMOLED display using current feedback based on a five‐mask LTPS CMOS process
Author(s) -
Schalberger Patrick,
Herrmann Marcus,
Hoehla Steffen,
Fruehauf Norbert
Publication year - 2011
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 - 10.1889/jsid19.7.496
Subject(s) - amoled , computer science , operational amplifier , cmos , current feedback operational amplifier , capacitor , realization (probability) , process (computing) , amplifier , electronic engineering , electrical engineering , materials science , thin film transistor , voltage , active matrix , engineering , layer (electronics) , operating system , statistics , mathematics , composite material
— In the past, a five‐mask LTPS CMOS process requiring only one single ion‐doping step was used. Based on that process, all necessary components for the realization of a fully integrated AMOLED display using a 3T1C current‐feedback pixel circuit has recently been developed. The integrated data driver is based on a newly developed LTPS operational amplifier, which does not require any compensation for Vth or mobility variations. Only one operational amplifier per column is used to perform digital‐to‐analog conversion as well as current control. In order to achieve high‐precision analog behavior, the operational amplifier is embedded in a switched capacitor network. In addition to circuit verification by simulation and analytic analysis, a 1‐in. fully integrated AMOLED demonstrator was successfully built. To the best of the authors' knowledge, this is the first implementation of a fully integrated AMOLED display with current feedback.