Abstract

This paper presents a method of driving active-matrix organic light-emitting diode (AMOLED) displays with amorphous silicon (a-Si) thin-film transistors (TFTs). By using current feedback, the method effectively compensates for the effect of shift in the threshold voltage $(V_{T})$ of a-Si TFTs on the OLED current. A CMOS transresistance amplifier is used as the column driver to cancel the effect of large parasitic capacitance of data lines. An accelerating pulse is used at the start of the programming cycle to improve the settling at low currents. A detailed analysis has been done to investigate the effect of circuit components on the sensitivity of the OLED current to $V_{T}$ shift and the settling behavior of the circuit. Prototypes of pixel circuits and the transresistance amplifier were fabricated in an a-Si TFT process and a 0.8-$\mu{\hbox{m}}$ 20-V CMOS technology, respectively. Measurements show less than 5% change in the OLED current for 2.5-V shift in $V_{T}$ of TFTs. Settling times smaller than 50 $\mu{\hbox{s}}$ were achieved for parasitic capacitances of 50–200 pF and programming currents as small as 200 nA.

© 2009 IEEE

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  1. G. Gu, S. R. Forrest, "Design of flat-panel displays based on organic light-emitting devices," IEEE J. Sel. Topics in Quantum Electron. 4, 83-99 (1998).
  2. J. N. Bardsley, "International OLED technology roadmap," IEEE J. Sel. Topics in Quantum Electron. 10, 3-9 (2004).
  3. M. A. Baldo, D. F. O'brien, Y. You, A. Shoustikov, S. Sibley, M. E. Thompson, S. R. Forrest, "Highly efficient phosphorescent emission from organic electroluminescent devices," Nature 395, 151 (1998).
  4. M. Stewart, R. S. Howell, L. Dires, K. Hatalis, "Polysilicon TFT technology for active matrix OLED displays," IEEE Trans. Electron Devices 48, 845-851 (2001).
  5. C. D. Dimitrakopoulos, P. R. L. Malenfant, "Organic thin film transistors for large area electronics," Adv. Mater. 14, 99-117 (2002).
  6. M. J. Powell, "The physics of amorphous-silicon thin-film transistors," IEEE Trans. Electron Devices 36, 2753-2763 (1989).
  7. M. J. Powell, C. van Berkel, J. R. Hughes, "Time and temperature dependence of instability mechanisms in amorphous silicon thin-film transistors," App. Phys. Lett. 54, 1323-1325 (1989).
  8. A. Kumar, A. Nathan, G. E. Jabbour, "Does TFT mobility impact pixel size in AMOLED backplanes?," IEEE Trans. Electron Devices 52, 2386-2394 (2005).
  9. Y. He, R. Hattori, J. Kanicki, "Current-source a-Si:H thin-film transistor circuit for active-matrix organic light-emitting displays," IEEE Electron Device Lett. 21, 590-592 (2000).
  10. A. Nathan, A. Kumar, K. Sakariya, P. Servati, S. Sambandan, D. Striakhilev, "Amorphous silicon thin film transistor circuit integration for organic LED displays on glass and plastic," IEEE J. Solid-State Circuits 39, 215-222 (2003).
  11. S. J. Ashtiani, P. Servati, D. Striakhilev, A. Nathan, "A 3-TFT current-programmed pixel circuit for active-matrix organic light-emitting diode displays," IEEE Trans. Electron Devices 52, 1514-1518 (2005).
  12. S. Ono, Y. Kobayashi, "An accelerative current-programming method for AM-OLED," IEICE Trans. Electronics E88-C, 264-269 (2005).
  13. A. Nathan, G. R. Chaji, S. J. Ashtiani, "Driving schemes for a-Si and LTPS AMOLED displays," J. Display Technol. 1, 267-277 (2005).
  14. J. Goh, H.-J. Chung, J. Jang, "A new pixel circuit for active matrix organic light emitting diodes," IEEE Electron Device Lett. 23, 544-546 (2002).
  15. J. Goh, J. Jang, K. Cho, C. Kim, "A new a-Si:H thin-film transistor pixel circuits for active matrix organic light-emitting diodes," IEEE Electron Device. Lett. 24, 583-585 (2003).
  16. S. Jafarabadiashtiani, "A new driving method for a-Si AMOLED displays based on voltage feedback," SID Int. Symp. Dig. Tech. Papers, (2005) pp. 316-317.
  17. S. J. Ashtiani, A. Nathan, "A fast driving scheme for a-Si:H AMOLED displays based on voltage feedback," Proc Annu. Meeting LEOS 2005 (2005) pp. 925-926.
  18. S. J. Ashtiani, A. Nathan, "A driving scheme for AMOLED display based on current feedback," Proc. IEEE Custom Integr. Circuits Conf. (2006) pp. 289-292.

2005 (4)

A. Kumar, A. Nathan, G. E. Jabbour, "Does TFT mobility impact pixel size in AMOLED backplanes?," IEEE Trans. Electron Devices 52, 2386-2394 (2005).

S. J. Ashtiani, P. Servati, D. Striakhilev, A. Nathan, "A 3-TFT current-programmed pixel circuit for active-matrix organic light-emitting diode displays," IEEE Trans. Electron Devices 52, 1514-1518 (2005).

S. Ono, Y. Kobayashi, "An accelerative current-programming method for AM-OLED," IEICE Trans. Electronics E88-C, 264-269 (2005).

A. Nathan, G. R. Chaji, S. J. Ashtiani, "Driving schemes for a-Si and LTPS AMOLED displays," J. Display Technol. 1, 267-277 (2005).

2004 (1)

J. N. Bardsley, "International OLED technology roadmap," IEEE J. Sel. Topics in Quantum Electron. 10, 3-9 (2004).

2003 (2)

A. Nathan, A. Kumar, K. Sakariya, P. Servati, S. Sambandan, D. Striakhilev, "Amorphous silicon thin film transistor circuit integration for organic LED displays on glass and plastic," IEEE J. Solid-State Circuits 39, 215-222 (2003).

J. Goh, J. Jang, K. Cho, C. Kim, "A new a-Si:H thin-film transistor pixel circuits for active matrix organic light-emitting diodes," IEEE Electron Device. Lett. 24, 583-585 (2003).

2002 (2)

J. Goh, H.-J. Chung, J. Jang, "A new pixel circuit for active matrix organic light emitting diodes," IEEE Electron Device Lett. 23, 544-546 (2002).

C. D. Dimitrakopoulos, P. R. L. Malenfant, "Organic thin film transistors for large area electronics," Adv. Mater. 14, 99-117 (2002).

2001 (1)

M. Stewart, R. S. Howell, L. Dires, K. Hatalis, "Polysilicon TFT technology for active matrix OLED displays," IEEE Trans. Electron Devices 48, 845-851 (2001).

2000 (1)

Y. He, R. Hattori, J. Kanicki, "Current-source a-Si:H thin-film transistor circuit for active-matrix organic light-emitting displays," IEEE Electron Device Lett. 21, 590-592 (2000).

1998 (2)

G. Gu, S. R. Forrest, "Design of flat-panel displays based on organic light-emitting devices," IEEE J. Sel. Topics in Quantum Electron. 4, 83-99 (1998).

M. A. Baldo, D. F. O'brien, Y. You, A. Shoustikov, S. Sibley, M. E. Thompson, S. R. Forrest, "Highly efficient phosphorescent emission from organic electroluminescent devices," Nature 395, 151 (1998).

1989 (2)

M. J. Powell, "The physics of amorphous-silicon thin-film transistors," IEEE Trans. Electron Devices 36, 2753-2763 (1989).

M. J. Powell, C. van Berkel, J. R. Hughes, "Time and temperature dependence of instability mechanisms in amorphous silicon thin-film transistors," App. Phys. Lett. 54, 1323-1325 (1989).

Adv. Mater. (1)

C. D. Dimitrakopoulos, P. R. L. Malenfant, "Organic thin film transistors for large area electronics," Adv. Mater. 14, 99-117 (2002).

App. Phys. Lett. (1)

M. J. Powell, C. van Berkel, J. R. Hughes, "Time and temperature dependence of instability mechanisms in amorphous silicon thin-film transistors," App. Phys. Lett. 54, 1323-1325 (1989).

IEEE Electron Device Lett. (2)

J. Goh, H.-J. Chung, J. Jang, "A new pixel circuit for active matrix organic light emitting diodes," IEEE Electron Device Lett. 23, 544-546 (2002).

Y. He, R. Hattori, J. Kanicki, "Current-source a-Si:H thin-film transistor circuit for active-matrix organic light-emitting displays," IEEE Electron Device Lett. 21, 590-592 (2000).

IEEE Electron Device. Lett. (1)

J. Goh, J. Jang, K. Cho, C. Kim, "A new a-Si:H thin-film transistor pixel circuits for active matrix organic light-emitting diodes," IEEE Electron Device. Lett. 24, 583-585 (2003).

IEEE J. Sel. Topics in Quantum Electron. (2)

G. Gu, S. R. Forrest, "Design of flat-panel displays based on organic light-emitting devices," IEEE J. Sel. Topics in Quantum Electron. 4, 83-99 (1998).

J. N. Bardsley, "International OLED technology roadmap," IEEE J. Sel. Topics in Quantum Electron. 10, 3-9 (2004).

IEEE J. Solid-State Circuits (1)

A. Nathan, A. Kumar, K. Sakariya, P. Servati, S. Sambandan, D. Striakhilev, "Amorphous silicon thin film transistor circuit integration for organic LED displays on glass and plastic," IEEE J. Solid-State Circuits 39, 215-222 (2003).

IEEE Trans. Electron Devices (4)

S. J. Ashtiani, P. Servati, D. Striakhilev, A. Nathan, "A 3-TFT current-programmed pixel circuit for active-matrix organic light-emitting diode displays," IEEE Trans. Electron Devices 52, 1514-1518 (2005).

M. J. Powell, "The physics of amorphous-silicon thin-film transistors," IEEE Trans. Electron Devices 36, 2753-2763 (1989).

A. Kumar, A. Nathan, G. E. Jabbour, "Does TFT mobility impact pixel size in AMOLED backplanes?," IEEE Trans. Electron Devices 52, 2386-2394 (2005).

M. Stewart, R. S. Howell, L. Dires, K. Hatalis, "Polysilicon TFT technology for active matrix OLED displays," IEEE Trans. Electron Devices 48, 845-851 (2001).

IEICE Trans. Electronics (1)

S. Ono, Y. Kobayashi, "An accelerative current-programming method for AM-OLED," IEICE Trans. Electronics E88-C, 264-269 (2005).

J. Display Technol. (1)

Nature (1)

M. A. Baldo, D. F. O'brien, Y. You, A. Shoustikov, S. Sibley, M. E. Thompson, S. R. Forrest, "Highly efficient phosphorescent emission from organic electroluminescent devices," Nature 395, 151 (1998).

Other (3)

S. Jafarabadiashtiani, "A new driving method for a-Si AMOLED displays based on voltage feedback," SID Int. Symp. Dig. Tech. Papers, (2005) pp. 316-317.

S. J. Ashtiani, A. Nathan, "A fast driving scheme for a-Si:H AMOLED displays based on voltage feedback," Proc Annu. Meeting LEOS 2005 (2005) pp. 925-926.

S. J. Ashtiani, A. Nathan, "A driving scheme for AMOLED display based on current feedback," Proc. IEEE Custom Integr. Circuits Conf. (2006) pp. 289-292.

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