1. Power saving through state retention in IGZO-TFT AMOLED displays for wearable applications
- Author
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Madelon Rovers, Joris Maas, Yen-Yu Huang, Karin van Diesen, Steve Smout, Paul Heremans, Marc Ameys, Jan Genoe, Jan-Laurens van der Steen, Manoj Nag, Tung Huei Ke, Joris de Riet, Roy Verbeek, Soeren Steudel, Florian De Roose, Shin-Chuan Chiang, Gerwin H. Gelinck, Gerard de Haas, Wim Dehaene, Thijs Bel, and Auke Jisk Kronemeijer
- Subjects
010302 applied physics ,Materials science ,business.industry ,Transistor ,Electrical engineering ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Polycrystalline silicon ,AMOLED ,Backplane ,law ,Thin-film transistor ,Flexible display ,0103 physical sciences ,engineering ,Electrical and Electronic Engineering ,Photolithography ,0210 nano-technology ,business ,Diode - Abstract
We present a qHD (960 × 540 with three sub-pixels) top-emitting active-matrix organic light-emitting diode display with a 340-ppi resolution using a self-aligned IGZO thin-film transistor backplane on polyimide foil with a humidity barrier. The back plane process flow is based on a seven-layer photolithography process with a CD = 4 μm. We implement a 2T1C pixel engine and use a commercial source driver IC made for low-temperature polycrystalline silicon. By using an IGZO thin-film transistor and leveraging the extremely low off current, we can switch off the power to the source and gate driver while maintaining the image unchanged for several minutes. We demonstrate that, depending on the image content, low-refresh operation yields reduction in power consumption of up to 50% compared with normal (continuous) operation. We show that with the further increase in resolution, the power saving through state retention will be even more significant.
- Published
- 2017
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