Abstract

This study presents a novel voltage-modulated pixel circuit for active-matrix organic light-emitting diode (AMOLED) consisting of five n-type thin-film transistors (TFTs), one additional control signal, and one storage capacitor. The proposed circuit, which can be implemented in all-n-type and all-p-type low temperature poly-silicon (LTPS) TFT technologies, successfully compensates for threshold voltage deviation of TFTs and facilitates correction of OLED degradation using a voltage feedback method. Simulation and experimental results for all-n-type TFTs indicate that the proposed pixel circuit reduced the nonuniformity brightness problem effectively by compensating for threshold voltage variation in TFTs and reduced the degradation of emission efficiency in OLEDs.

© 2007 IEEE

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  1. R. Dawson, Z. Shen, D. A. Furest, S. Connor, J. Hsu, M. G. Kane, R. G. Stewart, A. Ipri, C. N. King, P. J. Green, R. T. Flegal, S. Pearson, C. W. Tang, S. Van Slyke, F. Chen, J. Shi, M. H. Lu, J. C. Sturm, "The impact of the transient response of organic light emitting diodes on the design of active matrix OLED displays," IEDM Tech. Dig. (1998) pp. 875-878.
  2. M. Stewart, R. S. Howell, L. Pires, M. K. Hatalis, W. Howard, O. Prache, "Polysilicon VGA active matrix OLED displays—Technology and performance," IEDM Tech. Dig. (1998) pp. 871-874.
  3. C. C. Wu, C. W. Chen, C. L. Lin, C. J. Yang, "Advanced organic light-emitting devices for enhancing display performances," J. Display Technol. 1, 248-266 (2005).
  4. M. Kimura, I. Yudasaka, S. Kanbe, H. Kobayashi, H. Kiguchi, S. I. Seki, S. Miyashita, T. Shimoda, T. Ozawa, K. Kitawada, T. Nakazawa, W. Miyazawa, H. Ohshima, "Low-temperature polysilicon thin-film transistor driving with integrated driver for high-resolution light emitting polymer display," IEEE Trans. Electron Devices 46, 2282-2288 (1999).
  5. 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, 1477-1486 (2004).
  6. M. J. Powell, C. Berkel, J. R. Hughes, "Time and temperature dependence of instability mechanisms in amorphous silicon thin-film transistors," Appl. Phys. Lett. 54, 1323-1325 (1989).
  7. T. F. Chen, C. F. Yeh, J. C. Lou, "Investigation of grain boundary control in the drain junction on laser-crystalized poly-si thin film transistors," IEEE Electron Device Lett. 24, 457-459 (2003).
  8. Y. H. Tai, B. T. Chen, Y. J. Kuo, C. C. Tsai, K. Y. Chiang, Y. J. Wei, H. C. Cheng, "A new pixel circuit for driving organic light emitting diodes with low temperature polycrystalline thin film transistors," J. Display Technol. 1, 100-104 (2005).
  9. J. C. Goh, H. J. Chung, J. Jang, C. H. Han, "A new pixel circuit for active matrix organic light emitting diodes," IEEE Electron Device Lett. 23, 544-546 (2002).
  10. J. C. Goh, J. Jang, K. S. Cho, C. K. Kim, "A new a-Si:H thin-film transistor pixel circuit for active-matrix organic light-emitting diodes," IEEE Electron Device Lett. 24, 583-585 (2003).
  11. S. H. Jung, W. J. Nam, M. K. Han, "A new voltage- modulated AMOLED pixel design compensating for threshold voltage variation in poly-Si TFTs," IEEE Electron Device Lett. 25, 690-692 (2004).
  12. J. H. Lee, J. H. Kim, M. K. Han, "A new a-Si:H TFT pixel circuit compensating the threshold voltage shift of a-Si:H TFT and OLED for active matrix OLED," IEEE Electron Device Lett. 26, 897-899 (2005).
  13. H. S. Shin, J. H. Lee, K. S. Shin, M. K. Han, "New pixel driving scheme based a-Si:H TFTs by eliminating the switching TFTs in the OLED current path for low power consumption," Proc. IDW (2005) pp. 657-660.
  14. H. Y. Lu, P. T. Liu, T. C. Chang, S. Chi, "Enhancement of brightness uniformity by a new voltage-modulated pixel design for AMOLED displays," IEEE Electron Device Lett. 27, 743-745 (2006).
  15. G. R. Chaji, A. Nathan, "A stable voltage-programmed pixel circuit for a-Si:H AMOLED displays," J. Display Technol. 2, 347-358 (2006).
  16. C. L. Lin, Y. C. Chen, "A novel LTPS-TFT pixel circuit compensating for TFT threshold-voltage shift and OLED degradation for AMOLED," IEEE Electron Device Lett. 28, 129-131 (2007).
  17. S. J. Ashtiani, G. R. Chaji, A. Nathan, "AMOLED pixel circuit with electronic compensation of luminance degradation," J. Display Technol. 3, 36-39 (2007).
  18. Y. He, R. Hottori, 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).
  19. J. H. Lee, W. J. Nam, S. H. Jung, M. K. Han, "A new current scaling pixel circuit for AMOLED," IEEE Electron Device Lett. 25, 280-282 (2004).
  20. Y. C. Lin, H. P. D. Shieh, J. Kanicki, "A novel current-scaling a-Si:H TFTs pixel electrode circuit for AM-OLEDs," IEEE Trans. Electron Devices 52, 1123-1131 (2005).
  21. H. Akimoto, H. Kageyama, Y. Shimizu, H. Awakura, S. Nishitani, T. Sato, "An innovative pixel-driving scheme for 64-level gray-scale full-color active matrix OLED displays," SID Tech. Dig. (2002) pp. 972-975.
  22. H. Akimoto, H. Kageyama, Y. Shimizu, H. Awakura, N. Kasai, N. Tokuda, T. Sato, "Two TFT pixel circuit with non-uniformity suppress-function for voltage programming active matrix OLED displays," SID Tech. Dig. (2005) pp. 1550-1553.
  23. Y. C. Lin, H. P. D. Shsieh, "Improvement of brightness uniformity by AC driving scheme for AMOLED display," IEEE Electron Device Lett. 25, 728-730 (2004).
  24. A. Giraldo, M. J. Childs, D. Fish, M. T. Johnson, M. Klein, H. Lifka, W. Oepts, W. A. Steer, N. D. Young, "Optical feedback in active matrix polymer OLED displays," IEEE LEOS 16th Annu. Meeting (2003) pp. 529-530.
  25. D. Fish, N. Young, S. Deane, A. Steer, D. George, A. Giraldo, H. Lifka, O. Gielkens, W. Oepts, "Optical feedback for AMOLED display compensation using LTPS and a-Si:H technologies," SID Tech. Dig. (2005) pp. 1340-1343.
  26. D. A. Torres, P. F. Lister, P. Newbury, "LUT-based compensation model for OLED degradation," J. Soc. Inf. Display 13, 435-441 (2005).
  27. P. E. Burrow, S. R. Forrest, T. X. Zhou, L. Michalski, "Operating lifetime of phosphorescent organic light emitting devices," Appl. Phys. Lett. 76, 2493-2495 (2000).

2007 (2)

C. L. Lin, Y. C. Chen, "A novel LTPS-TFT pixel circuit compensating for TFT threshold-voltage shift and OLED degradation for AMOLED," IEEE Electron Device Lett. 28, 129-131 (2007).

S. J. Ashtiani, G. R. Chaji, A. Nathan, "AMOLED pixel circuit with electronic compensation of luminance degradation," J. Display Technol. 3, 36-39 (2007).

2006 (2)

G. R. Chaji, A. Nathan, "A stable voltage-programmed pixel circuit for a-Si:H AMOLED displays," J. Display Technol. 2, 347-358 (2006).

H. Y. Lu, P. T. Liu, T. C. Chang, S. Chi, "Enhancement of brightness uniformity by a new voltage-modulated pixel design for AMOLED displays," IEEE Electron Device Lett. 27, 743-745 (2006).

2005 (5)

Y. C. Lin, H. P. D. Shieh, J. Kanicki, "A novel current-scaling a-Si:H TFTs pixel electrode circuit for AM-OLEDs," IEEE Trans. Electron Devices 52, 1123-1131 (2005).

Y. H. Tai, B. T. Chen, Y. J. Kuo, C. C. Tsai, K. Y. Chiang, Y. J. Wei, H. C. Cheng, "A new pixel circuit for driving organic light emitting diodes with low temperature polycrystalline thin film transistors," J. Display Technol. 1, 100-104 (2005).

C. C. Wu, C. W. Chen, C. L. Lin, C. J. Yang, "Advanced organic light-emitting devices for enhancing display performances," J. Display Technol. 1, 248-266 (2005).

D. A. Torres, P. F. Lister, P. Newbury, "LUT-based compensation model for OLED degradation," J. Soc. Inf. Display 13, 435-441 (2005).

J. H. Lee, J. H. Kim, M. K. Han, "A new a-Si:H TFT pixel circuit compensating the threshold voltage shift of a-Si:H TFT and OLED for active matrix OLED," IEEE Electron Device Lett. 26, 897-899 (2005).

2004 (4)

S. H. Jung, W. J. Nam, M. K. Han, "A new voltage- modulated AMOLED pixel design compensating for threshold voltage variation in poly-Si TFTs," IEEE Electron Device Lett. 25, 690-692 (2004).

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, 1477-1486 (2004).

Y. C. Lin, H. P. D. Shsieh, "Improvement of brightness uniformity by AC driving scheme for AMOLED display," IEEE Electron Device Lett. 25, 728-730 (2004).

J. H. Lee, W. J. Nam, S. H. Jung, M. K. Han, "A new current scaling pixel circuit for AMOLED," IEEE Electron Device Lett. 25, 280-282 (2004).

2003 (2)

T. F. Chen, C. F. Yeh, J. C. Lou, "Investigation of grain boundary control in the drain junction on laser-crystalized poly-si thin film transistors," IEEE Electron Device Lett. 24, 457-459 (2003).

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

2002 (1)

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

2000 (2)

Y. He, R. Hottori, 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).

P. E. Burrow, S. R. Forrest, T. X. Zhou, L. Michalski, "Operating lifetime of phosphorescent organic light emitting devices," Appl. Phys. Lett. 76, 2493-2495 (2000).

1999 (1)

M. Kimura, I. Yudasaka, S. Kanbe, H. Kobayashi, H. Kiguchi, S. I. Seki, S. Miyashita, T. Shimoda, T. Ozawa, K. Kitawada, T. Nakazawa, W. Miyazawa, H. Ohshima, "Low-temperature polysilicon thin-film transistor driving with integrated driver for high-resolution light emitting polymer display," IEEE Trans. Electron Devices 46, 2282-2288 (1999).

1989 (1)

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

Appl. Phys. Lett. (1)

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

Appl. Phys. Lett. (1)

P. E. Burrow, S. R. Forrest, T. X. Zhou, L. Michalski, "Operating lifetime of phosphorescent organic light emitting devices," Appl. Phys. Lett. 76, 2493-2495 (2000).

IEEE Electron Device Lett. (3)

T. F. Chen, C. F. Yeh, J. C. Lou, "Investigation of grain boundary control in the drain junction on laser-crystalized poly-si thin film transistors," IEEE Electron Device Lett. 24, 457-459 (2003).

S. H. Jung, W. J. Nam, M. K. Han, "A new voltage- modulated AMOLED pixel design compensating for threshold voltage variation in poly-Si TFTs," IEEE Electron Device Lett. 25, 690-692 (2004).

C. L. Lin, Y. C. Chen, "A novel LTPS-TFT pixel circuit compensating for TFT threshold-voltage shift and OLED degradation for AMOLED," IEEE Electron Device Lett. 28, 129-131 (2007).

IEEE Electron Device Lett. (7)

J. H. Lee, J. H. Kim, M. K. Han, "A new a-Si:H TFT pixel circuit compensating the threshold voltage shift of a-Si:H TFT and OLED for active matrix OLED," IEEE Electron Device Lett. 26, 897-899 (2005).

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

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

Y. C. Lin, H. P. D. Shsieh, "Improvement of brightness uniformity by AC driving scheme for AMOLED display," IEEE Electron Device Lett. 25, 728-730 (2004).

H. Y. Lu, P. T. Liu, T. C. Chang, S. Chi, "Enhancement of brightness uniformity by a new voltage-modulated pixel design for AMOLED displays," IEEE Electron Device Lett. 27, 743-745 (2006).

Y. He, R. Hottori, 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).

J. H. Lee, W. J. Nam, S. H. Jung, M. K. Han, "A new current scaling pixel circuit for AMOLED," IEEE Electron Device Lett. 25, 280-282 (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, 1477-1486 (2004).

IEEE Trans. Electron Devices (2)

M. Kimura, I. Yudasaka, S. Kanbe, H. Kobayashi, H. Kiguchi, S. I. Seki, S. Miyashita, T. Shimoda, T. Ozawa, K. Kitawada, T. Nakazawa, W. Miyazawa, H. Ohshima, "Low-temperature polysilicon thin-film transistor driving with integrated driver for high-resolution light emitting polymer display," IEEE Trans. Electron Devices 46, 2282-2288 (1999).

Y. C. Lin, H. P. D. Shieh, J. Kanicki, "A novel current-scaling a-Si:H TFTs pixel electrode circuit for AM-OLEDs," IEEE Trans. Electron Devices 52, 1123-1131 (2005).

J. Display Technol. (4)

J. Soc. Inf. Display (1)

D. A. Torres, P. F. Lister, P. Newbury, "LUT-based compensation model for OLED degradation," J. Soc. Inf. Display 13, 435-441 (2005).

Other (7)

H. Akimoto, H. Kageyama, Y. Shimizu, H. Awakura, S. Nishitani, T. Sato, "An innovative pixel-driving scheme for 64-level gray-scale full-color active matrix OLED displays," SID Tech. Dig. (2002) pp. 972-975.

H. Akimoto, H. Kageyama, Y. Shimizu, H. Awakura, N. Kasai, N. Tokuda, T. Sato, "Two TFT pixel circuit with non-uniformity suppress-function for voltage programming active matrix OLED displays," SID Tech. Dig. (2005) pp. 1550-1553.

A. Giraldo, M. J. Childs, D. Fish, M. T. Johnson, M. Klein, H. Lifka, W. Oepts, W. A. Steer, N. D. Young, "Optical feedback in active matrix polymer OLED displays," IEEE LEOS 16th Annu. Meeting (2003) pp. 529-530.

D. Fish, N. Young, S. Deane, A. Steer, D. George, A. Giraldo, H. Lifka, O. Gielkens, W. Oepts, "Optical feedback for AMOLED display compensation using LTPS and a-Si:H technologies," SID Tech. Dig. (2005) pp. 1340-1343.

R. Dawson, Z. Shen, D. A. Furest, S. Connor, J. Hsu, M. G. Kane, R. G. Stewart, A. Ipri, C. N. King, P. J. Green, R. T. Flegal, S. Pearson, C. W. Tang, S. Van Slyke, F. Chen, J. Shi, M. H. Lu, J. C. Sturm, "The impact of the transient response of organic light emitting diodes on the design of active matrix OLED displays," IEDM Tech. Dig. (1998) pp. 875-878.

M. Stewart, R. S. Howell, L. Pires, M. K. Hatalis, W. Howard, O. Prache, "Polysilicon VGA active matrix OLED displays—Technology and performance," IEDM Tech. Dig. (1998) pp. 871-874.

H. S. Shin, J. H. Lee, K. S. Shin, M. K. Han, "New pixel driving scheme based a-Si:H TFTs by eliminating the switching TFTs in the OLED current path for low power consumption," Proc. IDW (2005) pp. 657-660.

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