JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
권호 표지
DOI QR코드

DOI QR Code

Pixel Circuit with Threshold Voltage Compensation using a-IGZO TFT for AMOLED

  • Received : 2014.05.12
  • Accepted : 2014.08.25
  • Published : 2014.10.30
Download PDF
⟨ Previous Next ⟩

Abstract

A threshold voltage compensation pixel circuit was developed for active-matrix organic light emitting diodes (AMOLEDs) using amorphous indium-gallium-zinc-oxide thin-film transistors (a-IGZO-TFTs). Oxide TFTs are n-channel TFTs; therefore, we developed a circuit for the n-channel TFT characteristics. The proposed pixel circuit was verified and proved by circuit analysis and circuit simulations. The proposed circuit was able to compensate for the threshold voltage variations of the drive TFT in AMOLEDs. The error rate of the OLED current for a threshold voltage change of 3 V was as low as 1.5%.

Keywords

References

  1. Y. G. Mo, M. K. Kim, C. K. Kang, J. H. Jeong, Y. S. Park, C. G. Choi, H. D. Kim, and S. S. Kim "Amorphous Oxide TFT Backplane for Large Size AMOLED TVs," J. Soc. Inf. Disp., Vol.19, No.1, pp.16-20, Jan., 2011. https://doi.org/10.1889/JSID19.1.16
  2. S. H. Na, J. H. Shim, M. Y. Kwak, and J. W. Seo, "Fabrication of Charge-pump Active-matrix OLED Display Panel with 64 x 64 Pixels," J. Info. Disp., Vol. 7, No. 1, pp. 35-40, Nov. 2010.
  3. R. Hattori, "Accuracy of Current Delivery System in Current Source Data-Drivr IC for AM-OLED," Journal of Semiconductor Technology and Science., Vol.4, No.4, pp.269-274, Dec., 2004.
  4. C. L. Lin, W. Y. Chang and C. C. Hung, "Compensating Pixel Circuit Driving AMOLED Display With a-IGZO TFTs," IEEE Electron Device Lett., Vol.34, No.9, pp.1166-1168, Sep., 2013. https://doi.org/10.1109/LED.2013.2271783
  5. C. Chen, K. Abe, T. C. Fung, H. Kumomi, and J. Kanicki "Amorphous In-Ga-Zn-O Thin Film Transistor Current-Scaling Pixel Electrode Circuit for Active-Matrix Organic Light-Emitting Displays," Jpn. J. Appl. Phys., Vol.48, pp.03B025-1-03B025-7, Mar., 2009.
  6. W. J. Wu, L. Zhou, M. Xu, L. R. Zhang, R. H. Yao, and J. B. Peng "An AC Driving Pixel Circuit Compensating for TFTs Threshold-Voltage Shift and OLED Degradation for AMOLED," J. Disp. Technol., Vol.9, No.7, pp.572-576, Jul., 2013. https://doi.org/10.1109/JDT.2013.2250254
  7. C. Chen, K. Abe, H. Kumomi, and J. Kanicki "a-InGaZnO Thin-Film Transistors for AMOLEDs: Electrical stability and Pixel-Circuit Simulation," J. Soc. Inf. Disp., Vol.17, No.6, pp.525-534, Jun., 2009. https://doi.org/10.1889/JSID17.6.525
  8. J. S. Lee, S. Chang, S. M. Koo, and S. Y. Lee "High-Performance a-IGZO TFT with $ZrO_2$ Gate Dielectric Fabricated at Room Temperature," IEEE Electron Device Lett., Vol.31, No.3, pp.225-227, Mar., 2010. https://doi.org/10.1109/LED.2009.2038806
  9. Y. K. Kim, J. D. Kim, H. K. Lym, S. Y. Kim, H. S. Oh, and K. C. Park, "A Gate Driver Circuit for IGZO TFTs Driven by Two Clock Signals," J. Info. Disp., Vol. 13, No. 4, pp. 179-183, Dec. 2012. https://doi.org/10.1080/15980316.2012.744363
  10. T. Kamiya, K. Nomura, and H. Hosono "Present status of Amorphous In-Ga-Zn-O Thin-Film Transistors," Sci. Technol. Adv. Mater., Vol.11, No.4, pp.044305-044328, Aug., 2010. https://doi.org/10.1088/1468-6996/11/4/044305
  11. H. H. Hsieh, H. H. Lu, H. C. Ting, C. S. Chuang, C. Y. Chen, and Y. Lin "Development of IGZO TFTs and Their Applications to Next-Generation Flat-Panel Displays," J. Info. Disp., Vol. 11, No. 4, pp. 160-164, Dec. 2010. https://doi.org/10.1080/15980316.2010.9665845
  12. C. Yang, X. Chen, J. Zhang, and C. Li "Design of an Amorphous In-Ga-Zn-O TFT Current-Scaling Pixel Driving Circuit for AMOLED with Threshold-voltage Shift Compensating," Proc. of the 2nd International Conference on Computer Science and Electronics Engineering, pp.1785-1788, Jan., 2013.
  13. T. C. Fung, C. S. Chuang, K. Nomura, H. P. Davide Shieh, H. Hosono, and J. Kanicki "Photofield-Effect in Amorphous In-Ga-Zn-O (a-IGZO) Thing-Film Transistors," J. Info. Disp., Vol. 9, No. 4, pp. 21-29, Dec. 2008. https://doi.org/10.1080/15980316.2008.9652066
  14. Y. G. Mo, M. K. Kim, C. K. Kang, J. H. Jeong, and Y. S. Park "Amorphous Oxide TFT Backplane for Large Size AMOLED TVs," J. Soc. Inf. Disp., Vol.19, No.1, pp.16-20, Jan., 2011. https://doi.org/10.1889/JSID19.1.16
  15. P. T. Liu, Y. T. Chou, and L. F. Teng "Environment-Dependent Metastability of Passivation-Free Indium Zinc Oxide Thin Film Transistor After Gate Bias Stress," Appl. Phys. Lett., Vol.95, pp.233504-1-233504-3, Dec., 2009. https://doi.org/10.1063/1.3272016
  16. I. S. Yang, and O. K. Kwon "Transparent Pixel Circuit with Threshold Voltage Compensation Using ZnO Thin-Film Transistors for Active-Matrix Organic Light Emitting Diode Displays," Jpn. J. Appl. Phys., Vol.48, pp.03B024-1-03B024-5, Mar., 2009.
  17. Y. C. Kim, J. Kanicki, and H. J. Kim "An a-InGaZnO TFT Pixel Circuit Compensating Threshold Voltage and Mobility Variations in AMOLEDs," J. Disp. Technol., Vol.10, No.5, pp.402-406, May., 2014. https://doi.org/10.1109/JDT.2014.2304615
  18. T. Tanabe, S. Amano, H. Miyake, A. Suzuki, R. Komatsu, J. Koyama, S. Yamazaki, K. Okazaki, M. Katayama, H. Matsukizono, Y. Kanzaki, and T. Matsuo "New Threshold Voltage Compensation Pixel Circuits in 13.5-inch Quad Full High Definition OLED Display of Crystalline In-Ga-Zn-Oxide FETs," SID Int. Symp. Dig. Tech. Pap., Vol.43, pp.88-91, Jun., 2012.
  19. C. Chen, J. Kanicki, K. Abe, and H. Kumomi "AM-OLED Pixel Circuits Based on a-InGaZnO thin film transistors," SID Int. Symp. Dig. Tech. Pap., Vol.40, pp.1128-1131, Jun., 2009.
  20. W. J. Nam, J. H. Lee, C. Y. Kim, H. J. Lee, and M. K. Han "High-Aperture Pixel Design Employing VDD Line Elimination for Active Matrix Organic Light Emitting Diode Display," Jpn. J. Appl. Phys., Vol.45, No.4A, pp.2433-2436, Apr., 2006. https://doi.org/10.1143/JJAP.45.2433
  21. S. P. Hong, D. S. Moon, B. S. Bae "Characterization of AMOLED Pixel Circuit Without Power Line," Analog Integr. Circuits Signal Process., Vol.70, No.1, pp.157-162, Jan., 2012. https://doi.org/10.1007/s10470-011-9706-6
  22. J. P. Lee, H. S. Jeon, D. S. Moon, and B. S. Bae "Threshold Voltage and IR Drop Compensation of an AMOLED Pixel Circuit Without a VDD Line," IEEE Electron Device Lett., Vol.35, No.1, pp.72-74, Jun., 2014. https://doi.org/10.1109/LED.2013.2289315
  23. H. S. Jung, Y. C. Kim, Y. S. Kim, C. Chen, J. Kanicki, and H. J. Lee "a-IGZO TFT Based Pixel Circuits for AM-OLED Displays," SID Int. Symp. Dig. Tech. Pap., Vol.43, pp.1097-1100, Jun., 2012.

Cited by

  1. Effects of residual hydrogen in sputtering atmosphere on structures and properties of amorphous In-Ga-Zn-O thin films vol.118, pp.20, 2015, https://doi.org/10.1063/1.4936552