Abstract

A new external algorithm with sensing circuit are proposed to compensate AMOLED display degradation. The compensation is enabled by first evaluating degradation level of OLEDs based on the OLED anode voltages detected by a newly-designed sensing subcircuit. According to sensed voltages, the external algorithm selects appropriate built-in models to compensate OLED degradation with the aim to achieve expected OLED emitted luminance. The models are established based on prior measurements to prescribe the relations between luminance and current $(L-I)$ and luminance and voltage $(L-V)$ of each OLED. In this way of compensation, the proposed method is able to incorporate negative effects of OLED degradation aggravation while increasing driving current to compensate the original decay in OLED luminance. Moreover, another algorithm along with the 4T0.5C pixel circuit as presented in prior studies are adopted to compensate process variation in $V_{\rm th}$ among pixels for improving the emission uniformity of an AMOLED panel. Experiments are conducted by combining the external algorithm with sensing circuit and the pixel circuit to validate the performances of compensating and alleviating OLED degradation.

© 2013 IEEE

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  1. C. Hosokawa, M. Matsuura, M. Eida, K. Fukuoka, H. Tokailin, T. Kusumoto, "Full-color organic EL display," J. SID 6, 257-260 (1998).
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  3. J. Shen, D. Wang, E. Langlois, W. A. Borrow, P. J. Green, C. W. Tang, J. Shi, "Degradation mechanisms in organic light emitting diodes," Synth. Metals 111, 233-236 (2000).
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  5. S. T. Lee, Z. Q. Gao, L. S. Hung, "Metal diffusion from electrodes in organic light-emitting diodes," Appl. Phys. Lett. 75, 1404-1406 (1999).
  6. M. Yahiro, D. Zou, T. Tsutsui, "Recoverable degradation phenomena of quantum efficiency in organic EL devices," Synthet. Metals 111, 245-247 (2000).
  7. Y. J. Si, L. Q. Lang, Y. Zhao, X. F. Chen, S. Y. Liu, "Improvement of pixel electrode circuit for active-matrix OLED by application of reversed-biased voltage," IEEE Trans. Circuits Syst. II, Exp. Briefs 52, 856-859 (2005).
  8. K. Y. Lee, C. P. Chao, "A new AMOLED pixel circuit with pulsed drive and reverse bias to alleviate OLED degradation," IEEE Trans. Electron Devices 59, 1123-1130 (2012).
  9. K. Y. Lee, Y. P. Hsu, C. P. Chao, "A new 4T0.5C AMOLED pixel circuit with reverse bias to alleviate OLED degradation," IEEE Electron Device Lett. 33, 1026-1024 (2012).
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  11. T. Kohno, H. Kageyama, M. Miyamoto, M. Ishii, N. Kasai, N. Nakamura, H. Akimoto, "High-speed programming architecture and image-sticking cancellation technology for high-resolution low-voltage AMOLEDs," IEEE Trans. Electron Devices 58, 3444-3452 (2011).
  12. C. L. Lin, Y. C. Chen, "A novel LTPS-TFT pixel circuit compensating for TFT threshold-voltage shift, OLED degradation for AMOLED," IEEE Electron Device Lett. 28, 129-131 (2007).
  13. H. J. In, O. K. Kwon, "External compensation of nonuniform electrical characteristics of thin-film transistors and degradation of OLED devices in AMOLED displays," IEEE Electron Device Lett. 30, 377-379 (2009).
  14. H. J. In, K. H. Oh, I. Lee, D. H. Ryu, S. M. Choi, K. N. Kim, H. D. Kim, O. K. Kwon, "An advanced external compensation system for active matrix organic light-emitting diode displays with poly-Si thin-film transistor backplane," IEEE Trans. Electron Devices 57, 3012-3019 (2010).
  15. U.-G. Min, H.-J. In, O.-K. Kwon, "A real time video data adjusting method for active matrix organic light emitting diode displays with high image quality," IEEE Trans. Consumer Electron. 55, 2372-2376 (2009).
  16. 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).
  17. 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).
  18. M. H. Jung, O. Kim, "Voltage distribution of power source in large AMOLED displays," J. Kor. Phys. Soc. 48, S5-S9 (2006).
  19. B. M. Weon, S. Y. Kim, J.-L. Lee, J. H. Je, "Evolution of luminance by voltage in organic light-emitting diodes," Appl. Phys. Lett. 88, (2006) Art. ID 013503.

2012

K. Y. Lee, C. P. Chao, "A new AMOLED pixel circuit with pulsed drive and reverse bias to alleviate OLED degradation," IEEE Trans. Electron Devices 59, 1123-1130 (2012).

K. Y. Lee, Y. P. Hsu, C. P. Chao, "A new 4T0.5C AMOLED pixel circuit with reverse bias to alleviate OLED degradation," IEEE Electron Device Lett. 33, 1026-1024 (2012).

2011

T. Kohno, H. Kageyama, M. Miyamoto, M. Ishii, N. Kasai, N. Nakamura, H. Akimoto, "High-speed programming architecture and image-sticking cancellation technology for high-resolution low-voltage AMOLEDs," IEEE Trans. Electron Devices 58, 3444-3452 (2011).

2010

H. J. In, K. H. Oh, I. Lee, D. H. Ryu, S. M. Choi, K. N. Kim, H. D. Kim, O. K. Kwon, "An advanced external compensation system for active matrix organic light-emitting diode displays with poly-Si thin-film transistor backplane," IEEE Trans. Electron Devices 57, 3012-3019 (2010).

2009

U.-G. Min, H.-J. In, O.-K. Kwon, "A real time video data adjusting method for active matrix organic light emitting diode displays with high image quality," IEEE Trans. Consumer Electron. 55, 2372-2376 (2009).

H. J. In, O. K. Kwon, "External compensation of nonuniform electrical characteristics of thin-film transistors and degradation of OLED devices in AMOLED displays," IEEE Electron Device Lett. 30, 377-379 (2009).

2007

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

G. R. Chaji, C. Ng, A. Nathan, A. Werner, J. Birnstock, O. Schneider, J. Blochwitz-Nimoth, "Electrical compensation of OLED luminance degradation," IEEE Electron Device Lett. 28, 1108-1110 (2007).

2006

M. H. Jung, O. Kim, "Voltage distribution of power source in large AMOLED displays," J. Kor. Phys. Soc. 48, S5-S9 (2006).

B. M. Weon, S. Y. Kim, J.-L. Lee, J. H. Je, "Evolution of luminance by voltage in organic light-emitting diodes," Appl. Phys. Lett. 88, (2006) Art. ID 013503.

2005

Y. J. Si, L. Q. Lang, Y. Zhao, X. F. Chen, S. Y. Liu, "Improvement of pixel electrode circuit for active-matrix OLED by application of reversed-biased voltage," IEEE Trans. Circuits Syst. II, Exp. Briefs 52, 856-859 (2005).

2004

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).

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

D. Y. Kondakov, J. R. Sandifer, C. W. Tang, R. H. Young, "Nonradiative recombination centers and electrical aging of organic light-emitting diodes: Direct connection between accumulation of trapped charge and luminance loss," J. Appl. Phys. 93, 1108-1119 (2003).

2001

M. Hack, J. J. Brown, J. K. Mahon, R. C. Kwong, R. Hewitt, "Performance of high-efficiency AMOLED displays," J. SID 9, 191-194 (2001).

2000

J. Shen, D. Wang, E. Langlois, W. A. Borrow, P. J. Green, C. W. Tang, J. Shi, "Degradation mechanisms in organic light emitting diodes," Synth. Metals 111, 233-236 (2000).

M. Yahiro, D. Zou, T. Tsutsui, "Recoverable degradation phenomena of quantum efficiency in organic EL devices," Synthet. Metals 111, 245-247 (2000).

1999

S. T. Lee, Z. Q. Gao, L. S. Hung, "Metal diffusion from electrodes in organic light-emitting diodes," Appl. Phys. Lett. 75, 1404-1406 (1999).

1998

C. Hosokawa, M. Matsuura, M. Eida, K. Fukuoka, H. Tokailin, T. Kusumoto, "Full-color organic EL display," J. SID 6, 257-260 (1998).

Appl. Phys. Lett.

S. T. Lee, Z. Q. Gao, L. S. Hung, "Metal diffusion from electrodes in organic light-emitting diodes," Appl. Phys. Lett. 75, 1404-1406 (1999).

Appl. Phys. Lett.

B. M. Weon, S. Y. Kim, J.-L. Lee, J. H. Je, "Evolution of luminance by voltage in organic light-emitting diodes," Appl. Phys. Lett. 88, (2006) Art. ID 013503.

IEEE Electron Device Lett.

K. Y. Lee, Y. P. Hsu, C. P. Chao, "A new 4T0.5C AMOLED pixel circuit with reverse bias to alleviate OLED degradation," IEEE Electron Device Lett. 33, 1026-1024 (2012).

IEEE Trans. Electron Devices

T. Kohno, H. Kageyama, M. Miyamoto, M. Ishii, N. Kasai, N. Nakamura, H. Akimoto, "High-speed programming architecture and image-sticking cancellation technology for high-resolution low-voltage AMOLEDs," IEEE Trans. Electron Devices 58, 3444-3452 (2011).

IEEE Electron Device Lett.

H. J. In, O. K. Kwon, "External compensation of nonuniform electrical characteristics of thin-film transistors and degradation of OLED devices in AMOLED displays," IEEE Electron Device Lett. 30, 377-379 (2009).

IEEE Electron Device Lett.

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).

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).

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

G. R. Chaji, C. Ng, A. Nathan, A. Werner, J. Birnstock, O. Schneider, J. Blochwitz-Nimoth, "Electrical compensation of OLED luminance degradation," IEEE Electron Device Lett. 28, 1108-1110 (2007).

IEEE Trans. Circuits Syst. II, Exp. Briefs

Y. J. Si, L. Q. Lang, Y. Zhao, X. F. Chen, S. Y. Liu, "Improvement of pixel electrode circuit for active-matrix OLED by application of reversed-biased voltage," IEEE Trans. Circuits Syst. II, Exp. Briefs 52, 856-859 (2005).

IEEE Trans. Consumer Electron.

U.-G. Min, H.-J. In, O.-K. Kwon, "A real time video data adjusting method for active matrix organic light emitting diode displays with high image quality," IEEE Trans. Consumer Electron. 55, 2372-2376 (2009).

IEEE Trans. Electron Devices

K. Y. Lee, C. P. Chao, "A new AMOLED pixel circuit with pulsed drive and reverse bias to alleviate OLED degradation," IEEE Trans. Electron Devices 59, 1123-1130 (2012).

H. J. In, K. H. Oh, I. Lee, D. H. Ryu, S. M. Choi, K. N. Kim, H. D. Kim, O. K. Kwon, "An advanced external compensation system for active matrix organic light-emitting diode displays with poly-Si thin-film transistor backplane," IEEE Trans. Electron Devices 57, 3012-3019 (2010).

J. Appl. Phys.

D. Y. Kondakov, J. R. Sandifer, C. W. Tang, R. H. Young, "Nonradiative recombination centers and electrical aging of organic light-emitting diodes: Direct connection between accumulation of trapped charge and luminance loss," J. Appl. Phys. 93, 1108-1119 (2003).

J. Kor. Phys. Soc.

M. H. Jung, O. Kim, "Voltage distribution of power source in large AMOLED displays," J. Kor. Phys. Soc. 48, S5-S9 (2006).

J. SID

C. Hosokawa, M. Matsuura, M. Eida, K. Fukuoka, H. Tokailin, T. Kusumoto, "Full-color organic EL display," J. SID 6, 257-260 (1998).

M. Hack, J. J. Brown, J. K. Mahon, R. C. Kwong, R. Hewitt, "Performance of high-efficiency AMOLED displays," J. SID 9, 191-194 (2001).

Synth. Metals

J. Shen, D. Wang, E. Langlois, W. A. Borrow, P. J. Green, C. W. Tang, J. Shi, "Degradation mechanisms in organic light emitting diodes," Synth. Metals 111, 233-236 (2000).

Synthet. Metals

M. Yahiro, D. Zou, T. Tsutsui, "Recoverable degradation phenomena of quantum efficiency in organic EL devices," Synthet. Metals 111, 245-247 (2000).

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