J. Semicond. > 2013, Volume 34 > Issue 12 > 125011
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SEMICONDUCTOR INTEGRATED CIRCUITS

A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays

Xiaofeng Song1, Jianguo Luo1, Lei Zhou2, Lirong Zhang2, Weijing Wu1, and Junbiao Peng1

+ Author Affiliations

 Corresponding author: Wu Weijing, wuwj@scut.edu.cn

DOI: 10.1088/1674-4926/34/12/125011

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Abstract: This paper presents a new poly-Si pixel circuit employing AC driving mode for active matrix organic light-emitting diode (AMOLED) displays. The proposed pixel circuit, which consists of one driving thin-film transistor (TFT), three switching TFTs, and one storage capacitor, can effectively compensate for the threshold voltage variation in poly-Si and the OLED degradation. As there is no light emission, except for during the emitting period, and a small number of devices used in the proposed pixel circuit, a high contrast ratio and a high pixel aperture ratio can be easily achieved. Simulation results by SMART-SPICE software show that the non-uniformity of the OLED current for the proposed pixel circuit is significantly decreased ( < 10%) with an average value of 2.63%, while that of the conventional 2T1C is 103%. Thus the brightness uniformity of AMOLED displays can be improved by using the proposed pixel circuit.

Key words: poly-Si, TFT, AMOLED, AC mode



[1]
Dawson R M A, Shen Z, Furst D A, et al. The impact of the transient response of organic light emitting diodes on the design of active matrix OLED displays. IEEE International Electron Devices Meeting (IEDM), 1998:875 http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=746494
[2]
Jung S H, Nam W J, Han M K. A new voltage-modulated AMOLED pixel design compensating for threshold voltage variation in poly-Si TFTs. IEEE Electron Device Lett, 2004, 25(10):690 doi: 10.1109/LED.2004.836028
[3]
He Yi, Hattori R, Kanicki J. Improved a-Si:H TFT pixel electrode circuits for active-matrix organic light emitting displays. IEEE Trans Electron Devices, 2001, 48(7):1322 doi: 10.1109/16.930646
[4]
Lee J H, Kim J H, Han M K. 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, 2005, 26(12):897 doi: 10.1109/LED.2005.859674
[5]
Lin Y C, Shieh H P D. Improvement of brightness uniformity by AC driving scheme for AMOLED display. IEEE Electron Device Lett, 2004, 25(11):728 doi: 10.1109/LED.2004.837535
[6]
Si Y J, Yi Z, Chen X F, et al. A simple and effective ac pixel driving circuit for active matrix OLED. IEEE Trans Electron Devices, 2003, 50(4):1137 doi: 10.1109/TED.2003.812100
[7]
Si Yujuan, Xu Yanlei, Lang Liuqi, et al. A new AC driving method for a current programmed AMOLED pixel circuit. Chinese Journal of Semiconductors, 2006, 27(9):1562 doi: 10.1088/1674-4926/34/1/015009/meta
[8]
Zhang Yongwen, Chen Wenbin. A new LTPS TFT AC pixel circuit for an AMOLED. Journal of Semiconductors, 2013, 34(1):015009 doi: 10.1088/1674-4926/34/1/015009
[9]
Zhang Yongwen, Chen Wenbin, Liu Haohan. A new AC driving circuit for a top emission AMOLED. Journal of Semiconductors, 2013, 34(5):055005 doi: 10.1088/1674-4926/34/5/055005
[10]
Kumar A, Sakariya K, Servati P, et al. Design considerations for active matrix organic light emitting diode arrays. IEE Proceedings-Circuits Devices and Systems, 2003, 150(4):322 doi: 10.1049/ip-cds:20030730
[11]
Nathan A, Chaji G R, Ashtiani S J. Driving schemes for a-Si and LTPS AMOLED displays. J Display Technol, 2005, 1(2):267 doi: 10.1109/JDT.2005.858913
[12]
Sakariya K, Servati P, Nathan A. Stability analysis of current programmed a-Si:H AMOLED pixel circuits. IEEE Trans Electron Devices, 2004, 50(12):2019 http://ieeexplore.ieee.org/document/1362962/keywords
[13]
Ono S, Miwa K, Maekawa Y, et al. V-T compensation circuit for AM OLED displays composed of two TFTs and one capacitor. IEEE Trans Electron Devices, 2007, 54(3):462 doi: 10.1109/TED.2006.890365
[14]
Lu Hanyan, Liu Potsun, Chang Tingchang, et al. Enhancement of brightness uniformity by a new voltage-modulated pixel design for AMOLED displays. IEEE Electron Device Lett, 2006, 27(9):743 doi: 10.1109/LED.2006.880648
[15]
Lee S Y, Kim B, Lee Y W, et al. A novel pixel circuit employing pre-charging method for large area AMOLED display.18th International Display Workshops, 2011, 1:65
[16]
Wu Weijing, Zhou Lei, Yao Ruohe, et al. A new voltage-programmed pixel circuit for enhancing the uniformity of AMOLED displays. IEEE Electron Device Lett, 2011, 32(7):931 doi: 10.1109/LED.2011.2148152
[17]
Park D W, Kang C K, Park Y S, et al. High-speed pixel circuits for large-sized 3-DAMO LED displays. Journal of The Society For Information Display, 2011, 19(4):329 doi: 10.1889/JSID19.4.329
[18]
Lin C L, Hung C C, Chang W Y, et al. Voltage driving scheme using three TFTs and one capacitor for active-matrix organic light-emitting diode pixel circuits. J Display Technol, 2012, 8(10):602 doi: 10.1109/JDT.2012.2209110
Fig. 1.  (a) Proposed pixel circuit schematic and (b) control signal timing diagram.

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Fig. 2.  Transient simulation results for the proposed pixel circuit.

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Fig. 3.  Non-uniformity of the OLED current versus the average current.

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[1]
Dawson R M A, Shen Z, Furst D A, et al. The impact of the transient response of organic light emitting diodes on the design of active matrix OLED displays. IEEE International Electron Devices Meeting (IEDM), 1998:875 http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=746494
[2]
Jung S H, Nam W J, Han M K. A new voltage-modulated AMOLED pixel design compensating for threshold voltage variation in poly-Si TFTs. IEEE Electron Device Lett, 2004, 25(10):690 doi: 10.1109/LED.2004.836028
[3]
He Yi, Hattori R, Kanicki J. Improved a-Si:H TFT pixel electrode circuits for active-matrix organic light emitting displays. IEEE Trans Electron Devices, 2001, 48(7):1322 doi: 10.1109/16.930646
[4]
Lee J H, Kim J H, Han M K. 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, 2005, 26(12):897 doi: 10.1109/LED.2005.859674
[5]
Lin Y C, Shieh H P D. Improvement of brightness uniformity by AC driving scheme for AMOLED display. IEEE Electron Device Lett, 2004, 25(11):728 doi: 10.1109/LED.2004.837535
[6]
Si Y J, Yi Z, Chen X F, et al. A simple and effective ac pixel driving circuit for active matrix OLED. IEEE Trans Electron Devices, 2003, 50(4):1137 doi: 10.1109/TED.2003.812100
[7]
Si Yujuan, Xu Yanlei, Lang Liuqi, et al. A new AC driving method for a current programmed AMOLED pixel circuit. Chinese Journal of Semiconductors, 2006, 27(9):1562 doi: 10.1088/1674-4926/34/1/015009/meta
[8]
Zhang Yongwen, Chen Wenbin. A new LTPS TFT AC pixel circuit for an AMOLED. Journal of Semiconductors, 2013, 34(1):015009 doi: 10.1088/1674-4926/34/1/015009
[9]
Zhang Yongwen, Chen Wenbin, Liu Haohan. A new AC driving circuit for a top emission AMOLED. Journal of Semiconductors, 2013, 34(5):055005 doi: 10.1088/1674-4926/34/5/055005
[10]
Kumar A, Sakariya K, Servati P, et al. Design considerations for active matrix organic light emitting diode arrays. IEE Proceedings-Circuits Devices and Systems, 2003, 150(4):322 doi: 10.1049/ip-cds:20030730
[11]
Nathan A, Chaji G R, Ashtiani S J. Driving schemes for a-Si and LTPS AMOLED displays. J Display Technol, 2005, 1(2):267 doi: 10.1109/JDT.2005.858913
[12]
Sakariya K, Servati P, Nathan A. Stability analysis of current programmed a-Si:H AMOLED pixel circuits. IEEE Trans Electron Devices, 2004, 50(12):2019 http://ieeexplore.ieee.org/document/1362962/keywords
[13]
Ono S, Miwa K, Maekawa Y, et al. V-T compensation circuit for AM OLED displays composed of two TFTs and one capacitor. IEEE Trans Electron Devices, 2007, 54(3):462 doi: 10.1109/TED.2006.890365
[14]
Lu Hanyan, Liu Potsun, Chang Tingchang, et al. Enhancement of brightness uniformity by a new voltage-modulated pixel design for AMOLED displays. IEEE Electron Device Lett, 2006, 27(9):743 doi: 10.1109/LED.2006.880648
[15]
Lee S Y, Kim B, Lee Y W, et al. A novel pixel circuit employing pre-charging method for large area AMOLED display.18th International Display Workshops, 2011, 1:65
[16]
Wu Weijing, Zhou Lei, Yao Ruohe, et al. A new voltage-programmed pixel circuit for enhancing the uniformity of AMOLED displays. IEEE Electron Device Lett, 2011, 32(7):931 doi: 10.1109/LED.2011.2148152
[17]
Park D W, Kang C K, Park Y S, et al. High-speed pixel circuits for large-sized 3-DAMO LED displays. Journal of The Society For Information Display, 2011, 19(4):329 doi: 10.1889/JSID19.4.329
[18]
Lin C L, Hung C C, Chang W Y, et al. Voltage driving scheme using three TFTs and one capacitor for active-matrix organic light-emitting diode pixel circuits. J Display Technol, 2012, 8(10):602 doi: 10.1109/JDT.2012.2209110

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    Received: 07 May 2013 Revised: 15 June 2013 Online: Published: 01 December 2013

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      Article Navigation >  Journal of Semiconductors  > 2013  >  34(12): 125011
      Xiaofeng Song, Jianguo Luo, Lei Zhou, Lirong Zhang, Weijing Wu, Junbiao Peng. A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays[J]. Journal of Semiconductors, 2013, 34(12): 125011. doi: 10.1088/1674-4926/34/12/125011 ****X F Song, J G Luo, L Zhou, L R Zhang, W J Wu, J B Peng. A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays[J]. J. Semicond., 2013, 34(12): 125011. doi: 10.1088/1674-4926/34/12/125011.
      Citation:
      Xiaofeng Song, Jianguo Luo, Lei Zhou, Lirong Zhang, Weijing Wu, Junbiao Peng. A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays[J]. Journal of Semiconductors, 2013, 34(12): 125011. doi: 10.1088/1674-4926/34/12/125011 ****
      X F Song, J G Luo, L Zhou, L R Zhang, W J Wu, J B Peng. A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays[J]. J. Semicond., 2013, 34(12): 125011. doi: 10.1088/1674-4926/34/12/125011.
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      A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays

      DOI: 10.1088/1674-4926/34/12/125011
      • 1.

        State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China

      • 2.

        School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, China

      Funds:

      the Outstanding Doctoral Dissertation of Guangdong Province sybzzxm201026

      Project supported by the National Natural Science Foundation of China (No. 61204089), the Guangdong Natural Science Foundation (No. S2012010008648), and the Outstanding Doctoral Dissertation of Guangdong Province (No. sybzzxm201026)

      the National Natural Science Foundation of China 61204089

      the Guangdong Natural Science Foundation S2012010008648

      More Information
      • Corresponding author: Wu Weijing, wuwj@scut.edu.cn
      • Received Date: 2013-05-07
      • Revised Date: 2013-06-15
      • Published Date: 2013-12-01

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