Abstract:
This paper presents design considerations along with measurement results pertinent to hydrogenated amorphous silicon (a-Si:H) thin film transistor (TFT) drive circuits fo...Show MoreMetadata
Abstract:
This paper presents design considerations along with measurement results pertinent to hydrogenated amorphous silicon (a-Si:H) thin film transistor (TFT) drive circuits for active matrix organic light emitting diode (AMOLED) displays. We describe both pixel architectures and TFT circuit topologies that are amenable for vertically integrated, high aperture ratio pixels. Here, the OLED layer is integrated directly above the TFT circuit layer, to provide an active pixel area that is at least 90% of the total pixel area with an aperture ratio that remains virtually independent of scaling. Both voltage-programmed and current-programmed drive circuits are considered. The latter provides compensation for shifts in device characteristics due to metastable shifts in the threshold voltage of the TFT. Various drive circuits on glass and plastic were fabricated and tested. Integration of on-panel gate drivers is also discussed where we present the architecture of an a-Si:H based gate de-multiplexer that is threshold voltage shift invariant. In addition, a programmable current mirror with good linearity and stability is presented. Programmable current sources are an essential requirement in the design of source driver output stages.
Published in: IEEE Journal of Solid-State Circuits ( Volume: 39, Issue: 9, September 2004)
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Arokia Nathan (S'84–M'88–SM'99) received the Ph.D. degree in electrical engineering from the University of Alberta, Edmonton, Alberta, Canada, in 1988, where he was engaged in research related to the physics and numerical modeling of semiconductor microsensors.
In 1987, he joined LSI Logic Corporation, Santa Clara, CA, where he worked on advanced multichip packaging techniques and related issues. Subsequently, he was at th...Show More
Arokia Nathan (S'84–M'88–SM'99) received the Ph.D. degree in electrical engineering from the University of Alberta, Edmonton, Alberta, Canada, in 1988, where he was engaged in research related to the physics and numerical modeling of semiconductor microsensors.
In 1987, he joined LSI Logic Corporation, Santa Clara, CA, where he worked on advanced multichip packaging techniques and related issues. Subsequently, he was at th...View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Anil Kumar received the Bachelors degree in electronics engineering in May 1998 from the Institute of Technology BHU, India. In January 2001, he joined the University of Waterloo, Canada, as a Masters student in electrical and computer engineering. Currently, he is working toward the Ph.D. degree in the field of AMOLED display.
From 1998 to 2000, he was with Motorola Semiconductors as a Circuit Design Engineer and worked o...Show More
Anil Kumar received the Bachelors degree in electronics engineering in May 1998 from the Institute of Technology BHU, India. In January 2001, he joined the University of Waterloo, Canada, as a Masters student in electrical and computer engineering. Currently, he is working toward the Ph.D. degree in the field of AMOLED display.
From 1998 to 2000, he was with Motorola Semiconductors as a Circuit Design Engineer and worked o...View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Kapil Sakariya received the B.Sc. degree in electrical engineering from the University of Manitoba, Canada, in 2001, and the M.A.Sc. degree from the University of Waterloo, Canada, in 2002. He is currently working toward the Ph.D. degree at the University of Waterloo.
His research interests are in the field of active matrix OLED display design using amorphous silicon technology.
Mr. Sakariya has received numerous provincial...Show More
Kapil Sakariya received the B.Sc. degree in electrical engineering from the University of Manitoba, Canada, in 2001, and the M.A.Sc. degree from the University of Waterloo, Canada, in 2002. He is currently working toward the Ph.D. degree at the University of Waterloo.
His research interests are in the field of active matrix OLED display design using amorphous silicon technology.
Mr. Sakariya has received numerous provincial...View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Peyman Servati (S'00) received the B.Sc. degree (with honors) in electronics engineering from the University of Tehran in 1998, and the M.A.Sc. and Ph.D. degrees from the University of Waterloo, Waterloo, Ontario, Canada, in 2000 and 2004, respectively. His dissertation was on mechanically flexible TFTs and circuits for active matrix organic light-emitting diode (AMOLED) displays and other large area applications. As an u...Show More
Peyman Servati (S'00) received the B.Sc. degree (with honors) in electronics engineering from the University of Tehran in 1998, and the M.A.Sc. and Ph.D. degrees from the University of Waterloo, Waterloo, Ontario, Canada, in 2000 and 2004, respectively. His dissertation was on mechanically flexible TFTs and circuits for active matrix organic light-emitting diode (AMOLED) displays and other large area applications. As an u...View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Sanjiv Sambandan (S'02) received the B.Tech. degree (with honors) in electrical engineering from the Indian Institute of Technology, Kharagpur, in 2002. His dissertation was on the development of an optic fiber based cryogenic temperature sensor, for which he received the Institute Proficiency Prize 2002. He received the M.A.Sc. degree in electrical and computer engineering in 2003 at the University of Waterloo, Ontario, ...Show More
Sanjiv Sambandan (S'02) received the B.Tech. degree (with honors) in electrical engineering from the Indian Institute of Technology, Kharagpur, in 2002. His dissertation was on the development of an optic fiber based cryogenic temperature sensor, for which he received the Institute Proficiency Prize 2002. He received the M.A.Sc. degree in electrical and computer engineering in 2003 at the University of Waterloo, Ontario, ...View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Denis Striakhilev (M'03) received Dipl.Eng. degree (technology of microelectronics) and Ph.D. degree in semiconductor physics from the Moscow Institute of Electronic Technology (Technical University), MIET (TU) Moscow, Russian Federation, in 1991 and 1996, respectively. During his Ph.D. work, he studied structural, electrical and optical properties of amorphous semiconductor alloys for photovoltaic applications.
During 199...Show More
Denis Striakhilev (M'03) received Dipl.Eng. degree (technology of microelectronics) and Ph.D. degree in semiconductor physics from the Moscow Institute of Electronic Technology (Technical University), MIET (TU) Moscow, Russian Federation, in 1991 and 1996, respectively. During his Ph.D. work, he studied structural, electrical and optical properties of amorphous semiconductor alloys for photovoltaic applications.
During 199...View more
Contents Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Arokia Nathan (S'84–M'88–SM'99) received the Ph.D. degree in electrical engineering from the University of Alberta, Edmonton, Alberta, Canada, in 1988, where he was engaged in research related to the physics and numerical modeling of semiconductor microsensors.
In 1987, he joined LSI Logic Corporation, Santa Clara, CA, where he worked on advanced multichip packaging techniques and related issues. Subsequently, he was at the Institute of Quantum Electronics, ETH Zürich, Switzerland. In 1989, he joined the Department of Electrical and Computer Engineering, University of Waterloo, Canada, where he is currently a Professor. In 1995, he was a Visiting Professor at the Physical Electronics Laboratory, ETH Zürich. His present research interests lie in fabrication of devices, circuits, and systems using disordered semiconductor, including organic, materials on rigid and mechanically flexible substrates for large area electronics. He held the DALSA/NSERC industrial research chair in sensor technology, and is a recipient of the Natural Sciences and Engineering Research Council E. W. R. Steacie Fellowship. He currently holds the Canada Research Chair in Nanoscale Elastic Circuits. He has published extensively in the field of sensor technology and CAD, and thin film transistor electronics, and is a coauthor of the book Microtransducer CAD (Springer, 1999).
Arokia Nathan (S'84–M'88–SM'99) received the Ph.D. degree in electrical engineering from the University of Alberta, Edmonton, Alberta, Canada, in 1988, where he was engaged in research related to the physics and numerical modeling of semiconductor microsensors.
In 1987, he joined LSI Logic Corporation, Santa Clara, CA, where he worked on advanced multichip packaging techniques and related issues. Subsequently, he was at the Institute of Quantum Electronics, ETH Zürich, Switzerland. In 1989, he joined the Department of Electrical and Computer Engineering, University of Waterloo, Canada, where he is currently a Professor. In 1995, he was a Visiting Professor at the Physical Electronics Laboratory, ETH Zürich. His present research interests lie in fabrication of devices, circuits, and systems using disordered semiconductor, including organic, materials on rigid and mechanically flexible substrates for large area electronics. He held the DALSA/NSERC industrial research chair in sensor technology, and is a recipient of the Natural Sciences and Engineering Research Council E. W. R. Steacie Fellowship. He currently holds the Canada Research Chair in Nanoscale Elastic Circuits. He has published extensively in the field of sensor technology and CAD, and thin film transistor electronics, and is a coauthor of the book Microtransducer CAD (Springer, 1999).View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Anil Kumar received the Bachelors degree in electronics engineering in May 1998 from the Institute of Technology BHU, India. In January 2001, he joined the University of Waterloo, Canada, as a Masters student in electrical and computer engineering. Currently, he is working toward the Ph.D. degree in the field of AMOLED display.
From 1998 to 2000, he was with Motorola Semiconductors as a Circuit Design Engineer and worked on SRAMs/IOs/VCOs.
Mr. Kumar is the current recipient of the CITO Student Research Excellence Scholarship, 2003.
Anil Kumar received the Bachelors degree in electronics engineering in May 1998 from the Institute of Technology BHU, India. In January 2001, he joined the University of Waterloo, Canada, as a Masters student in electrical and computer engineering. Currently, he is working toward the Ph.D. degree in the field of AMOLED display.
From 1998 to 2000, he was with Motorola Semiconductors as a Circuit Design Engineer and worked on SRAMs/IOs/VCOs.
Mr. Kumar is the current recipient of the CITO Student Research Excellence Scholarship, 2003.View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Kapil Sakariya received the B.Sc. degree in electrical engineering from the University of Manitoba, Canada, in 2001, and the M.A.Sc. degree from the University of Waterloo, Canada, in 2002. He is currently working toward the Ph.D. degree at the University of Waterloo.
His research interests are in the field of active matrix OLED display design using amorphous silicon technology.
Mr. Sakariya has received numerous provincial and national scholarships including two Natural Sciences and Engineering Research Council of Canada (NSERC) awards.
Kapil Sakariya received the B.Sc. degree in electrical engineering from the University of Manitoba, Canada, in 2001, and the M.A.Sc. degree from the University of Waterloo, Canada, in 2002. He is currently working toward the Ph.D. degree at the University of Waterloo.
His research interests are in the field of active matrix OLED display design using amorphous silicon technology.
Mr. Sakariya has received numerous provincial and national scholarships including two Natural Sciences and Engineering Research Council of Canada (NSERC) awards.View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Peyman Servati (S'00) received the B.Sc. degree (with honors) in electronics engineering from the University of Tehran in 1998, and the M.A.Sc. and Ph.D. degrees from the University of Waterloo, Waterloo, Ontario, Canada, in 2000 and 2004, respectively. His dissertation was on mechanically flexible TFTs and circuits for active matrix organic light-emitting diode (AMOLED) displays and other large area applications. As an undergraduate student, he was involved in device simulations in the thin-film laboratories at the University of Tehran. Subsequently, he joined the a-SiDIC group of the University of Waterloo.
He is currently with IGNIS Innovation, Inc., a spin-off company from the University of Waterloo, working on stable TFT backplanes for AMOLED displays. His present research interest lies in disordered organic and silicon TFTs for displays and bio applications.
Mr. Servati was a recipient of the Bronze Medal in the XXV I.Ph.O. competitions held in Beijing, China, 1994, and currently holds the Natural Sciences and Engineering Research Council (NSERC) of Canada Postgraduate Scholarship.
Peyman Servati (S'00) received the B.Sc. degree (with honors) in electronics engineering from the University of Tehran in 1998, and the M.A.Sc. and Ph.D. degrees from the University of Waterloo, Waterloo, Ontario, Canada, in 2000 and 2004, respectively. His dissertation was on mechanically flexible TFTs and circuits for active matrix organic light-emitting diode (AMOLED) displays and other large area applications. As an undergraduate student, he was involved in device simulations in the thin-film laboratories at the University of Tehran. Subsequently, he joined the a-SiDIC group of the University of Waterloo.
He is currently with IGNIS Innovation, Inc., a spin-off company from the University of Waterloo, working on stable TFT backplanes for AMOLED displays. His present research interest lies in disordered organic and silicon TFTs for displays and bio applications.
Mr. Servati was a recipient of the Bronze Medal in the XXV I.Ph.O. competitions held in Beijing, China, 1994, and currently holds the Natural Sciences and Engineering Research Council (NSERC) of Canada Postgraduate Scholarship.View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Sanjiv Sambandan (S'02) received the B.Tech. degree (with honors) in electrical engineering from the Indian Institute of Technology, Kharagpur, in 2002. His dissertation was on the development of an optic fiber based cryogenic temperature sensor, for which he received the Institute Proficiency Prize 2002. He received the M.A.Sc. degree in electrical and computer engineering in 2003 at the University of Waterloo, Ontario, Canada, for his thesis on a-Si:H TFT-based driver circuits for AMOLED displays. He is currently working toward the Ph.D. degree at the University of Waterloo.
Sanjiv Sambandan (S'02) received the B.Tech. degree (with honors) in electrical engineering from the Indian Institute of Technology, Kharagpur, in 2002. His dissertation was on the development of an optic fiber based cryogenic temperature sensor, for which he received the Institute Proficiency Prize 2002. He received the M.A.Sc. degree in electrical and computer engineering in 2003 at the University of Waterloo, Ontario, Canada, for his thesis on a-Si:H TFT-based driver circuits for AMOLED displays. He is currently working toward the Ph.D. degree at the University of Waterloo.View more
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ONT, Canada
Denis Striakhilev (M'03) received Dipl.Eng. degree (technology of microelectronics) and Ph.D. degree in semiconductor physics from the Moscow Institute of Electronic Technology (Technical University), MIET (TU) Moscow, Russian Federation, in 1991 and 1996, respectively. During his Ph.D. work, he studied structural, electrical and optical properties of amorphous semiconductor alloys for photovoltaic applications.
During 1997–1998, he was a Visiting Scientist at the Department of Physics, University of Kaiserslautern, Kaiserlautern, Germany, and a holder of a DAAD research scholarship. Subsequently, he was a Research Fellow at the Department of Material Science, MIET(TU) and Assistant Professor at the Department of Physics, Yaroslavl State Pedagogical University, Yaroslavl, Russia. Since 2000, he has been with the Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario, Canada. His present research is primarily related to thin-film devices for display and imaging applications including mechanically flexible electronic devices. He is author or coauthor of more than 30 publications and two patents.
Dr. Striakhilev is a member of the Materials Research Society, and Society for Information Displays.
Denis Striakhilev (M'03) received Dipl.Eng. degree (technology of microelectronics) and Ph.D. degree in semiconductor physics from the Moscow Institute of Electronic Technology (Technical University), MIET (TU) Moscow, Russian Federation, in 1991 and 1996, respectively. During his Ph.D. work, he studied structural, electrical and optical properties of amorphous semiconductor alloys for photovoltaic applications.
During 1997–1998, he was a Visiting Scientist at the Department of Physics, University of Kaiserslautern, Kaiserlautern, Germany, and a holder of a DAAD research scholarship. Subsequently, he was a Research Fellow at the Department of Material Science, MIET(TU) and Assistant Professor at the Department of Physics, Yaroslavl State Pedagogical University, Yaroslavl, Russia. Since 2000, he has been with the Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario, Canada. His present research is primarily related to thin-film devices for display and imaging applications including mechanically flexible electronic devices. He is author or coauthor of more than 30 publications and two patents.
Dr. Striakhilev is a member of the Materials Research Society, and Society for Information Displays.View more
