Skip to main content

Low Temperature a-Si:H Pixel Circuits for Mechanically Flexible AMOLED Displays

  • Arokia Nathan (a1), Denis Striakhilev (a1), Peyman Servati (a1), Kapil Sakariya (a1), Anil Kumar (a1), Karim S. Karim (a1) and Andrei Sazonov (a1)...

This paper presents the first demonstration of amorphous silicon (a-Si:H) thin film transistor (TFT) circuit integration on plastic substrates. The circuits compensate for material shortcomings such as metastable threshold voltage (VT) shift and high contact resistance, to supply stable and predictable currents to drive organic light emitting diode (OLED) displays on plastic. Various drive circuits were fabricated and tested. The simplest pixel driver circuit possible is the two TFT voltage-programmed circuit, which is very susceptible to any shift in VT of the drive TFT. To overcome this problem, we have developed current-programmed pixel circuits based on the current mirror circuit family, which include the simple and cascode current mirrors. The OLED current in these circuits is virtually independent of any VT shift or mobility variation in the drive TFT. Results show that the circuits provide higher linearity and dynamic range than currently available pixel circuits while minimizing the pixel area.

Hide All
1.Tang C. W., “An Overview of organic electroluminescent materials and devices,” SID Int. Symp. 1996, vol. 27, pp. 181184.
2.Cambridge Display Technology (CDT),
3.Universal Display Corp. (UDC),
4.Miri A. M. and Chamberlain S. G., “A totally wet etch fabrication technology for amorphous silicon thin film transistors,” Mat. Res. Soc. Symp. Proc., vol. 377, pp. 737742, 1995.
5.Servati P. and Nathan A., J. Vac. Sci. Tech. A, 20, 1038 (2002).
6.Shur M. S., Slade H. C., Jacunski M. D., Owusu A. A., and Ytterdal T., J. Electrochem. Soc. 144, 2833 (1997).
7.Leroux T., Solid-State Elec. 29, 47 (1986).
8.Servati P., Striakhilev D., and Nathan A., Mat. Res. Soc. Symp. Proc., MRS Spring 2003, to appear.
9.Berkel C. van and Powell M. J., “Resolution of amorphous silicon thin-film transistor instability mechanisms using ambipolar transistors,” App. Phys. Lett., vol. 51, no. 14, pp. 10941096, Oct. 1987.
10.Mohan N., Karim K. S., Nathan A., ‘Design of multiplexer in amorphous ailicon technology’, J. Vac. Sci. Tech. A, vol. 40, p. 1043, 2002.
11.Gu G. and Forrest S. R., “Design of Flat-Panel Displays Based on Organic Light- Emitting Devices,” IEEE Journal of Selected Topics in Quantum Electronics, vol. 4, no. 1, pp. 8399, Jan./Feb. 1998.
12.He Y., Hattori R., Kanicki J., ‘Current-source a-Si:H thin film transistor circuit for active matrix organic light emitting displays’, IEEE Electron Device Letts., vol. 21, p. 590, 2000.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Full text views

Total number of HTML views: 0
Total number of PDF views: 3 *
Loading metrics...

Abstract views

Total abstract views: 131 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 22nd January 2018. This data will be updated every 24 hours.