Achieving sensing precision of 0.5nA in pixel with 7μs settling time by a new external current sensing circuit for amoled displays

Rajeev Pandey, Tzu Hao Huang, Wei Hsuan Ho, Paul C.-P. Chao, Eka Fitrah Pribadi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study proposes a new push-pull transient current feedforward (PPTCF) based pixel current sensing circuit for active matrix organic light emitting diode (AMOLED) displays with precision within 0.5nA. A finite state machine (FSM) based digital control circuit is designed and developed for the baseline compensation. In order to achieve high accuracy the digital baseline compensation circuit also incorporates the current digital-to-analog converter (CDAC) and successive approximation current analog-to-digital converter (CADC). The minimum LSB current for the CADC is 10nA. The readout circuit is implemented in the integrated chip with chip area of 125μm × 46μm and fabricated via TSMC T18 process. With standard 3.3V supply, the experimental result shows that the overall power consumption of the chip is 990μW watt. Despite of all parasitic capacitances of the panel display, experimental results show that the proposed circuit can sense 0.5nA current within 7μs of settling time. The sensing precision of 0.5nA within 7μs are the best among all reported literature to date.

Original languageEnglish
Title of host publicationASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791859124
DOIs
StatePublished - 27 Jun 2018
EventASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019 - San Diego, United States
Duration: 27 Jun 201928 Jun 2019

Publication series

NameASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019

Conference

ConferenceASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019
CountryUnited States
CitySan Diego
Period27/06/1928/06/19

Keywords

  • AMOLED
  • CADC
  • CDAC
  • PPTCF
  • SAR ADC

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    Pandey, R., Huang, T. H., Ho, W. H., Chao, P. C-P., & Pribadi, E. F. (2018). Achieving sensing precision of 0.5nA in pixel with 7μs settling time by a new external current sensing circuit for amoled displays. In ASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019 (ASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/ISPS2019-7474