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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 10, Iss. 7 — Jul. 1, 2014
  • pp: 574–581

Hybrid Sensor and Display Pixel Circuits for Mobile Near-to-Eye Applications

Nikolas P. Papadopoulos, Czang-Ho Lee, and William S. Wong

Journal of Display Technology, Vol. 10, Issue 7, pp. 574-581 (2014)


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Abstract

Hybrid sensor/display pixels and their operating schemes are proposed, simulated, and characterized. The circuit design implemented a phototransistor connected to a drive thin-film transistor (TFT) and an organic light-emitting diode (OLED). The circuits were fabricated using hydrogenated amorphous-silicon (a-Si:H) TFTs as a hybrid photosensor/switching device. The light sensitivity of the phototransistors and response to incident illumination were modeled and verified experimentally for different white-light intensities. The pixel gray scale was determined by the pulse-height voltage modulation from the phototransistor, which was varied by changing the light intensity. The resulting circuits have a wide dynamic range with a light to dark output current ratio of $10^{4}$ for TFTs having channel lengths of $<{{10}}\ \mu{m}$ and light intensity up to $\sim {{8}}\ {{mW/cm}}^{2}$ . A 256-RGB-level imaging scale is possible with 5-nA steps for each grey scale in a pixel array matrix having a refresh rate of more than 200 Hz.

© 2014 IEEE

Citation
Nikolas P. Papadopoulos, Czang-Ho Lee, and William S. Wong, "Hybrid Sensor and Display Pixel Circuits for Mobile Near-to-Eye Applications," J. Display Technol. 10, 574-581 (2014)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-10-7-574


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