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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 9, Iss. 8 — Aug. 1, 2013
  • pp: 651–655

Driving Scheme Using MIS Photosensor for Luminance Control of AMOLED Pixel

Yuri Vygranenko, Miguel Fernandes, Andrei Sazonov, and Manuela Vieira

Journal of Display Technology, Vol. 9, Issue 8, pp. 651-655 (2013)


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Abstract

This paper presents a new driving scheme utilizing an in-pixel metal-insulator-semiconductor (MIS) photosensor for luminance control of active-matrix organic light-emitting diode (AMOLED) pixel. The proposed 3-TFT circuit is controlled by an external driver performing the signal readout, processing, and programming operations according to a luminance adjusting algorithm. To maintain the fabrication simplicity, the embedded MIS photosensor shares the same layer stack with pixel TFTs. Performance characteristics of the MIS structure with a ${{nc}}{{--}}{{Si}}:{{H}}/a{{-}}{{Si}}:{{H}}$ bilayer absorber were measured and analyzed to prove the concept. The observed transient dark current is associated with charge trapping at the insulator–semiconductor interface that can be largely eliminated by adjusting the bias voltage during the refresh cycle. Other factors limiting the dynamic range and external quantum efficiency are also determined and verified using a small-signal model of the device. Experimental results demonstrate the feasibility of the MIS photosensor for the discussed driving scheme.

© 2013 IEEE

Citation
Yuri Vygranenko, Miguel Fernandes, Andrei Sazonov, and Manuela Vieira, "Driving Scheme Using MIS Photosensor for Luminance Control of AMOLED Pixel," J. Display Technol. 9, 651-655 (2013)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-9-8-651

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