J. Semicond. > 2013, Volume 34 > Issue 5 > 055005
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SEMICONDUCTOR INTEGRATED CIRCUITS

A new AC driving circuit for a top emission AMOLED

Yongwen Zhang1, Wenbin Chen1, and Haohan Liu2

+ Author Affiliations

 Corresponding author: Chen Wenbin, Email:chenwb@uestc.edu.cn

DOI: 10.1088/1674-4926/34/5/055005

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Abstract: A new voltage programmed pixel circuit with top emission design for active-matrix organic light-emitting diode (AMOLED) displays is presented and verified by HSPICE simulations. The proposed pixel circuit consists of five poly-Si TFTs, and can effectively compensate for the threshold voltage variation of the driving TFT. Meanwhile, the proposed pixel circuit offers an AC driving mode for the OLED by the two adjacent pulse voltage sources, which can suppress the degradation of the OLED. Moreover, a high contrast ratio can be achieved by the proposed pixel circuit since the OLED does not emit any light except for the emission period.

Key words: AMOLED, AC driving mode, top emission, pixel circuit, SPICE simulation, uniformity



[1]
Meng Zhiguo, Kwok Hoising, Wu Chunya, et al. Fabrication of a 125 mm poly-Si TFT active-matrix driving color AMOLED. Chinese Journal of Semiconductors, 2006, 27(8):1514
[2]
Liu Xueqiang, Zhang Tong, Wang Lijie, et al. A testing method on a thin film transistor array for active matrix organic emitting diode. Chinese Journal of Semiconductors, 2007, 28(7):1161 http://www.oalib.com/paper/1522052
[3]
Ashtiani S J, Nathan A. A driving scheme for active-matrix organic light emitting diode displays based on feedback. IEEE J Display Technol, 2009, 5(7):257 doi: 10.1109/JDT.2009.2016117
[4]
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
[5]
Lin C L, Hung C C, Kuo P Y, et al. New LTPS pixel circuit with AC driving method to reduce OLED degradation for 3D AMOLED displays. IEEE J Display Technol, 2012, 8(12):681 doi: 10.1109/JDT.2012.2225017
[6]
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
[7]
Wang L, Liao C, Liang Y, et al. A new four-transistor poly-Si pixel circuit for AMOLED. ICSICT-IEEE Int, 2010:1453
[8]
Lin C L, Tsai T T, Chen Y C. A novel voltage-feedback pixel circuit for AMOLED displays. IEEE J Display Technol, 2008, 4(1):54 doi: 10.1109/JDT.2007.901555
[9]
Wu W J, Zhou L, Yao R H, 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
[10]
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. IEEE J Display Technol, 2012, 8(10):602 doi: 10.1109/JDT.2012.2209110
[11]
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
[12]
Shur M S, Slade H C, Jacunski M D, et al. SPICE models for amorphous silicon and polysilicon thin film transistors. J Electrochem Soc, 1997, 144(8):2833 doi: 10.1149/1.1837903
[13]
Chen C W, Lin C L, Wu C C. An effective cathode structure for inverted top-emitting organic light-emitting devices. Appl Phys Lett, 2004, 85(13):2469 doi: 10.1063/1.1798392
[14]
Guo X, Silva S R P. A simple and effective approach to improve the output linearity of switched-current AMOLED pixel circuitry. IEEE Electron Device Lett, 2007, 28(10):887 doi: 10.1109/LED.2007.904905
Fig. 1.  Proposed circuit schematic and control signal timing diagram. (1) Presetting period. (2) Compensation period. (3) Emission period.

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Fig. 2.  (a) Layout design of the unit proposed pixel circuit using top emission design. (b) The equivalent scheme of the proposed pixel circuit.

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Fig. 3.  Transient simulation results of the proposed pixel circuit ($V_{\rm DATA}$ $=$ 4 V and $\Delta V_{\rm TH}$ $=$ 0 V).

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Fig. 4.  Voltage stored in $C_{\rm s}$ in the emission period versus $V_{\rm DATA}$.

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Fig. 5.  Transfer characteristics of the uncompensated 2T1C pixel circuit and the proposed pixel circuit at different threshold voltage variations ($\Delta V_{\rm TH}$ $=$ $-0.3$, 0, and $+0.3$ V).

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Fig. 6.  Error rate of the OLED current in the uncompensated 2T1C pixel circuit and the proposed pixel circuit resulting from the threshold voltage variations ($\Delta V_{\rm TH}$ $=$ $-0.3$, 0, and $+0.3$ V).

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Fig. 7.  Non-uniformity of the OLED current versus the average OLED current in the proposed pixel circuit and the uncompensated 2T1C pixel circuit.

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Table 1.   Pixel parameters used for simulation.

Table 2.   Comparison results.
[1]
Meng Zhiguo, Kwok Hoising, Wu Chunya, et al. Fabrication of a 125 mm poly-Si TFT active-matrix driving color AMOLED. Chinese Journal of Semiconductors, 2006, 27(8):1514
[2]
Liu Xueqiang, Zhang Tong, Wang Lijie, et al. A testing method on a thin film transistor array for active matrix organic emitting diode. Chinese Journal of Semiconductors, 2007, 28(7):1161 http://www.oalib.com/paper/1522052
[3]
Ashtiani S J, Nathan A. A driving scheme for active-matrix organic light emitting diode displays based on feedback. IEEE J Display Technol, 2009, 5(7):257 doi: 10.1109/JDT.2009.2016117
[4]
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
[5]
Lin C L, Hung C C, Kuo P Y, et al. New LTPS pixel circuit with AC driving method to reduce OLED degradation for 3D AMOLED displays. IEEE J Display Technol, 2012, 8(12):681 doi: 10.1109/JDT.2012.2225017
[6]
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
[7]
Wang L, Liao C, Liang Y, et al. A new four-transistor poly-Si pixel circuit for AMOLED. ICSICT-IEEE Int, 2010:1453
[8]
Lin C L, Tsai T T, Chen Y C. A novel voltage-feedback pixel circuit for AMOLED displays. IEEE J Display Technol, 2008, 4(1):54 doi: 10.1109/JDT.2007.901555
[9]
Wu W J, Zhou L, Yao R H, 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
[10]
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. IEEE J Display Technol, 2012, 8(10):602 doi: 10.1109/JDT.2012.2209110
[11]
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
[12]
Shur M S, Slade H C, Jacunski M D, et al. SPICE models for amorphous silicon and polysilicon thin film transistors. J Electrochem Soc, 1997, 144(8):2833 doi: 10.1149/1.1837903
[13]
Chen C W, Lin C L, Wu C C. An effective cathode structure for inverted top-emitting organic light-emitting devices. Appl Phys Lett, 2004, 85(13):2469 doi: 10.1063/1.1798392
[14]
Guo X, Silva S R P. A simple and effective approach to improve the output linearity of switched-current AMOLED pixel circuitry. IEEE Electron Device Lett, 2007, 28(10):887 doi: 10.1109/LED.2007.904905

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    Received: 14 August 2012 Revised: 12 December 2012 Online: Published: 01 May 2013

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      Article Navigation >  Journal of Semiconductors  > 2013  >  34(5): 055005
      Yongwen Zhang, Wenbin Chen, Haohan Liu. A new AC driving circuit for a top emission AMOLED[J]. Journal of Semiconductors, 2013, 34(5): 055005. doi: 10.1088/1674-4926/34/5/055005 ****Y W Zhang, W B Chen, H H Liu. A new AC driving circuit for a top emission AMOLED[J]. J. Semicond., 2013, 34(5): 055005. doi: 10.1088/1674-4926/34/5/055005.
      Citation:
      Yongwen Zhang, Wenbin Chen, Haohan Liu. A new AC driving circuit for a top emission AMOLED[J]. Journal of Semiconductors, 2013, 34(5): 055005. doi: 10.1088/1674-4926/34/5/055005 ****
      Y W Zhang, W B Chen, H H Liu. A new AC driving circuit for a top emission AMOLED[J]. J. Semicond., 2013, 34(5): 055005. doi: 10.1088/1674-4926/34/5/055005.
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      A new AC driving circuit for a top emission AMOLED

      DOI: 10.1088/1674-4926/34/5/055005
      • 1.

        School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China

      • 2.

        School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China

      Funds:

      Project supported by the Foundation Research of Sichuan Province, China (No. 2010JY0003)

      the Foundation Research of Sichuan Province, China 2010JY0003

      More Information
      • Corresponding author: Chen Wenbin, Email:chenwb@uestc.edu.cn
      • Received Date: 2012-08-14
      • Revised Date: 2012-12-12
      • Published Date: 2013-05-01

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