Fig. 1.
(a) Proposed pixel circuit schematic and (b) control signal timing diagram.
DownLoad:
| 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.
Export: BibTex EndNote
|
A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays
doi: 10.1088/1674-4926/34/12/125011
More Information-
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. -
References
[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 -
Proportional views
