Abstract
The active-matrix organic light emitting diode (AMOLED) display has been considered as the next generation in display technology because of its advantages on power consumption, viewing angle, color quality, response time, and contrast ratio. Unlike active matrix LCD (AMLCD), OLED is a current driven device and so each pixel needs to provide highly accurate (over 10-bit) and programable current to the corresponding OLED. Several technologies have been developed for fabrication of the TFTs, based on different semiconductor materials including amorphous silicon (a-Si), poly silicon, metal-oxide, organic, and nano composites. However, all these technologies suffer from one or more issues such as low mobility, aging, hysteresis, temperature dependency, and non-uniformity. At IGNIS, we have developed several methods for resolving these issues based on different applications leading to a multi-technology application-oriented design concept. We believe the same concept can be used in other emerging technologies and applications. This talk will review the AMOLED display operation, and issues associated with each backplane technologies followed by IGNIS solution for TV and tablet applications based on external calibration incorporating a new imaging system, device and material modification, and noise cancelation techniques.
Biography
G. Reza Chaji received his Ph.D. degree (2008) in Electrical Engineering at the University of Waterloo, Waterloo, Canada, where he worked on design and implementation of AMOLED displays, biomedical imagers, and bio-array sensors. He received his B.Sc. (with honors) and M.Sc. degrees from the University of Tehran, Tehran, Iran, in 1999, and 2001, respectively. In his MSc dissertation, he worked on low-power high-performance digital circuits and systems. In 2001, he joined Valence Semiconductor Inc., Dubai, UAE, where he developed security processors for internet applications. He subsequently moved to Valence Semiconductor Inc., Toronto, Canada, to develop custom-designed DSP processors for digital communication. He is currently working as the Chief Technology Officer at Ignis Innovation Inc., Kitchener, Canada where he manages the programs for the development of low-cost, high-yield and low-power backplanes for AMOLED displays and he is in-charge of company strategic planing and resource management. In addition, he is pursuing his research on in-vivo/ in-virtue biomedical imagers/sensors and new design methodologies for mixed-technology concepts as an Adjunct Professor at the University of Waterloo. He has over 40 published paper in the field of display and sensor, 53 filed/granted patent applications, and received several prestigious scholarships and awards including CMC Douglas R. Colton Medal for Research Excellence, Canada Graduate Scholarship (CGSD), Strategic Microelectronics Council of ITAC Industrial Collaboration Award, Ontario Graduate Scholarship (OGS), University of Waterloo Graduate Scholarship, and NSERC Post-Doctoral Fellowship.