TY - JOUR
T1 - Suppressing VTH variations in LTPS thin-film transistors with current scaling ratio modulation for AMOLED Display
AU - Lin, Chih Lung
AU - Hsu, Chih Cheng
AU - Chen, Po Syun
AU - Lai, Po Chun
AU - Lee, Po Ting
AU - Kuo, Pin Yen
N1 - Funding Information:
Manuscript received April 1, 2018; revised June 1, 2018; accepted June 12, 2018. Date of publication July 11, 2018; date of current version July 23, 2018. This work was supported in part by the Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan, in part by the Ministry of Science and Technology of Taiwan under Project MOST 106-2218-E-006-024 and Project MOST 104-2221-E-006-189-MY3, and in part by AU Optronics Corporation. The review of this brief was arranged by Editor X. Guo. (Corresponding author: Chih-Lung Lin.) C.-L. Lin is with the Department of Electrical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan, and also with the Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701-01, Taiwan (e-mail: [email protected]).
Publisher Copyright:
© 1963-2012 IEEE.
PY - 2018/8
Y1 - 2018/8
N2 - This brief suppresses threshold voltage (VTH) variations in low-temperature polycrystalline-silicon thin-film transistors (LTPS TFTs) with a new current scaling ratio modulation method for the application of active-matrix organic light-emitting diode displays. With a newly proposed 3T2C LTPS TFT-based pixel circuit, high-current scaling ratios at low gray levels and low ratios at high gray levels are achieved. Thus, the programming time at low gray levels can be reduced, and the driving currents of the OLED are efficiently generated over the entire data range without consuming extra power for the current source. The driving currents are also independent of the threshold voltage of the driving TFT and the power line voltage, guaranteeing the uniformity of the current. Simulation results demonstrate that the relative current error rates are below 3.7% as the threshold voltage varies ±0.5 V and below 5.3% as the threshold voltage varies ±0.5 V and the power line voltage drops by 1 V; the programming time can be as short as only 12μs.
AB - This brief suppresses threshold voltage (VTH) variations in low-temperature polycrystalline-silicon thin-film transistors (LTPS TFTs) with a new current scaling ratio modulation method for the application of active-matrix organic light-emitting diode displays. With a newly proposed 3T2C LTPS TFT-based pixel circuit, high-current scaling ratios at low gray levels and low ratios at high gray levels are achieved. Thus, the programming time at low gray levels can be reduced, and the driving currents of the OLED are efficiently generated over the entire data range without consuming extra power for the current source. The driving currents are also independent of the threshold voltage of the driving TFT and the power line voltage, guaranteeing the uniformity of the current. Simulation results demonstrate that the relative current error rates are below 3.7% as the threshold voltage varies ±0.5 V and below 5.3% as the threshold voltage varies ±0.5 V and the power line voltage drops by 1 V; the programming time can be as short as only 12μs.
UR - http://www.scopus.com/inward/record.url?scp=85049788749&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85049788749&partnerID=8YFLogxK
U2 - 10.1109/TED.2018.2848700
DO - 10.1109/TED.2018.2848700
M3 - Article
AN - SCOPUS:85049788749
SN - 0018-9383
VL - 65
SP - 3577
EP - 3581
JO - IEEE Transactions on Electron Devices
JF - IEEE Transactions on Electron Devices
IS - 8
M1 - 8409984
ER -