Power saving through state retention in IGZO-TFT AMOLED displays for wearable applications

Soeren Steudel, Jan Laurens P.J. Van Der Steen, Manoj Nag, Tung Huei Ke, Steve Smout, Thijs Bei, Karin van Diesen, Gerard de Haas, Joris Maas, Joris de Riet, Madelon Rovers, Roy Verbeek, Yen Yu Huang, Shin Chuan Chiang, Marc Ameys, Florian De Roose, Wim Dehaene, Jan Genoe, Paul Heremans, Gerwin GelinckAuke Jisk Kronemeijer

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

We present a qHD (960×540 with 3 sub-pixels) top-emitting ‘AMOLED display with 340ppi resolution using a self-aligned (SA) IGZO TFT backplane on polyimidefoil with humidity barrier. The back plane process flow is based on a 7 layer photolithography process with a CD=4um. We implement a 2TIC pixel engine and use commercial source driver IC made for LTPS. By using IGZO TFT and leveraging the extremely low off-current, we can switch-offthe power to the source and gate driver while maintaining the image un-changed for several minutes We demonstrate that, depending on the image content, low-refresh operation yields reduction in power consumption of up to 50% compared to normal (continuous) operation. We show that with further increase in resolution, the power saving through state retention will be even more significant.

Original languageEnglish
Pages (from-to)38-41
Number of pages4
JournalSID International Symposium : Digest of Technical Papers
Volume48
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017
EventSID Symposium, Seminar, and Exhibition 2017, Display Week 2017 - Los Angeles, United States
Duration: 21 May 201726 May 2017

Keywords

  • AMOLED
  • Flexible displays
  • Metal-oxide semiconductors
  • Self-aligned TFT
  • State retention

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    Steudel, S., Van Der Steen, J. L. P. J., Nag, M., Ke, T. H., Smout, S., Bei, T., van Diesen, K., de Haas, G., Maas, J., de Riet, J., Rovers, M., Verbeek, R., Huang, Y. Y., Chiang, S. C., Ameys, M., De Roose, F., Dehaene, W., Genoe, J., Heremans, P., ... Kronemeijer, A. J. (2017). Power saving through state retention in IGZO-TFT AMOLED displays for wearable applications. SID International Symposium : Digest of Technical Papers, 48(1), 38-41. https://doi.org/10.1002/sdtp.11575