Abstract

This work presents a new active-matrix organic light-emitting diode (AMOLED) pixel circuit with a novel driving scheme that is based on low-temperature polycrystalline-silicon thin film transistors (LTPS TFTs). The proposed circuit that consists of one driving TFT and two switching TFTs, which are all p-type, can successfully compensate for not only variations in the TFT threshold voltage but also the current-resistance (IR) voltage drop in the power line. The functionality of the pixel circuit for the array structure and the uniformity of organic light-emitting diode (OLED) current are verified using H-Simulation Program with Integrated Circuit Emphasis (HSPICE). According to the results of a simulation, over the entire range of tested data voltages (-4.5 to -2.5 V), the relative errors of the OLED current of the proposed circuit are below 1.2% when the driving TFT threshold voltage varies from -0.5 to +0.5 V.

© 2012 IEEE

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  1. M. Stewart, R. S. Howell, L. Pires, M. K. Hatalis, W. Howard, O. Parche, "Polysilicon VGA active matrix OLED displays—Technology and performance," IEDM Tech. Dig. (1998) pp. 871-874.
  2. R. M. A. Dawson, Z. Shen, D. A. Furst, 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.
  3. A. Nathan, G. R. Chaji, S. J. Ashtiani, "Driving schemes for a-Si and LTPS AMOLED displays," J. Display Technol. 1, 267-277 (2005).
  4. 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).
  5. 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).
  6. C. L. Lin, T. T. Tsai, Y. C. Chen, "A novel voltage-feedback pixel circuit for AMOLED display," J. Display Technol. 4, 54-60 (2008).
  7. 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).
  8. 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).
  9. 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).
  10. W. J. Wu, L. Zhou, R. H. Yao, J. B. Peng, "A new voltage-programmed pixel circuit for enhancing the uniformity of AMOLED displays," IEEE Electron Device Lett. 32, 931-933 (2011).
  11. S. J. Ashtiani, P. Servati, D. Striakhilev, A. Nathan, "A 3-TFT current-programmed pixel circuit for AMOLEDs," IEEE Trans. Electron Devices 52, 1514-1518 (2005).
  12. C. L. Lin, T. T. Tsai, "A novel voltage driving method using 3-TFT pixel circuit for AMOLED," IEEE Electron Device Lett. 28, 489-491 (2007).
  13. 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).
  14. C. L. Lin, C. C. Hung, W. Y. Chang, K. W. Chou, C. Y. Chuang, "Novel a-Si:H AMOLED pixel circuit to ameliorate OLED luminance degradation by external detection," IEEE Electron Device Lett. 32, 1716-1718 (2011).
  15. HSPICE (2004) User's Manual, Synopsys.
  16. C. L. Lin, K. W. Chou, C. C. Hung, C. D. Tu, "Lifetime amelioration for an AMOLED pixel circuit by using a novel ac driving scheme," IEEE Trans. Electron Devices 58, 2652-2659 (2011).
  17. C. L. Lin, K. W. Chou, C. C. Hung, K. C. Liao, "Reducing OLED degradation using self-compensated circuit for AMOLED displays," IEEE Electron Device Lett. 32, 1403-1405 (2011).
  18. G. R. Chaji, C. Ng, A. Nathan, A. Werner, J. Birnstock, O. Schneider, J. B. Nimoth, "Electrical compensation of OLED luminance degradation," IEEE Electron Device Lett. 28, 1108-1110 (2007).
  19. H. Y. Lu, T. T. Chang, Y. H. Tai, P. T. Liu, S. Chi, "A new pixel circuit compensating for brightness variation in large size and high resolution AMOLED displays," J. Display Technol. 3, 398-403 (2007).
  20. T. Sakurai, "Approximation of wiring delay in MOSFET LSI," IEEE J. Solid-State Circuits SC-18, 418-426 (1983).
  21. H. J. In, P. S. Kwag, J. S. Kang, O. K. Kwon, H. K. Chung, "Voltage-programming method with transimpedance-feedback technique for threshold voltage and mobility compensations in large-area high-resolution AMOLED displays," J. Soc. Inf. Display 14, 665-671 (2006).

2011 (4)

C. L. Lin, C. C. Hung, W. Y. Chang, K. W. Chou, C. Y. Chuang, "Novel a-Si:H AMOLED pixel circuit to ameliorate OLED luminance degradation by external detection," IEEE Electron Device Lett. 32, 1716-1718 (2011).

C. L. Lin, K. W. Chou, C. C. Hung, C. D. Tu, "Lifetime amelioration for an AMOLED pixel circuit by using a novel ac driving scheme," IEEE Trans. Electron Devices 58, 2652-2659 (2011).

C. L. Lin, K. W. Chou, C. C. Hung, K. C. Liao, "Reducing OLED degradation using self-compensated circuit for AMOLED displays," IEEE Electron Device Lett. 32, 1403-1405 (2011).

W. J. Wu, L. Zhou, R. H. Yao, J. B. Peng, "A new voltage-programmed pixel circuit for enhancing the uniformity of AMOLED displays," IEEE Electron Device Lett. 32, 931-933 (2011).

2008 (1)

2007 (3)

C. L. Lin, T. T. Tsai, "A novel voltage driving method using 3-TFT pixel circuit for AMOLED," IEEE Electron Device Lett. 28, 489-491 (2007).

H. Y. Lu, T. T. Chang, Y. H. Tai, P. T. Liu, S. Chi, "A new pixel circuit compensating for brightness variation in large size and high resolution AMOLED displays," J. Display Technol. 3, 398-403 (2007).

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

2006 (2)

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).

H. J. In, P. S. Kwag, J. S. Kang, O. K. Kwon, H. K. Chung, "Voltage-programming method with transimpedance-feedback technique for threshold voltage and mobility compensations in large-area high-resolution AMOLED displays," J. Soc. Inf. Display 14, 665-671 (2006).

2005 (5)

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).

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

S. J. Ashtiani, P. Servati, D. Striakhilev, A. Nathan, "A 3-TFT current-programmed pixel circuit for AMOLEDs," IEEE Trans. Electron Devices 52, 1514-1518 (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 (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).

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).

1983 (1)

T. Sakurai, "Approximation of wiring delay in MOSFET LSI," IEEE J. Solid-State Circuits SC-18, 418-426 (1983).

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).

IEEE Electron Device Lett. (7)

W. J. Wu, L. Zhou, R. H. Yao, J. B. Peng, "A new voltage-programmed pixel circuit for enhancing the uniformity of AMOLED displays," IEEE Electron Device Lett. 32, 931-933 (2011).

C. L. Lin, T. T. Tsai, "A novel voltage driving method using 3-TFT pixel circuit for AMOLED," IEEE Electron Device Lett. 28, 489-491 (2007).

C. L. Lin, C. C. Hung, W. Y. Chang, K. W. Chou, C. Y. Chuang, "Novel a-Si:H AMOLED pixel circuit to ameliorate OLED luminance degradation by external detection," IEEE Electron Device Lett. 32, 1716-1718 (2011).

C. L. Lin, K. W. Chou, C. C. Hung, K. C. Liao, "Reducing OLED degradation using self-compensated circuit for AMOLED displays," IEEE Electron Device Lett. 32, 1403-1405 (2011).

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

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).

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).

IEEE J. Solid-State Circuits (2)

T. Sakurai, "Approximation of wiring delay in MOSFET LSI," IEEE J. Solid-State Circuits SC-18, 418-426 (1983).

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)

C. L. Lin, K. W. Chou, C. C. Hung, C. D. Tu, "Lifetime amelioration for an AMOLED pixel circuit by using a novel ac driving scheme," IEEE Trans. Electron Devices 58, 2652-2659 (2011).

S. J. Ashtiani, P. Servati, D. Striakhilev, A. Nathan, "A 3-TFT current-programmed pixel circuit for AMOLEDs," IEEE Trans. Electron Devices 52, 1514-1518 (2005).

J. Display Technol. (5)

J. Soc. Inf. Display (1)

H. J. In, P. S. Kwag, J. S. Kang, O. K. Kwon, H. K. Chung, "Voltage-programming method with transimpedance-feedback technique for threshold voltage and mobility compensations in large-area high-resolution AMOLED displays," J. Soc. Inf. Display 14, 665-671 (2006).

Other (3)

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

R. M. A. Dawson, Z. Shen, D. A. Furst, 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.

HSPICE (2004) User's Manual, Synopsys.

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