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http://dx.doi.org/10.13067/JKIECS.2014.9.3.279

5-TFT OLED Pixel Circuit Compensating Threshold Voltage Variation of p-channel Poly-Si TFTs  

Chung, Hoon-Ju (금오공과대학교 전자공학부)
Publication Information
The Journal of the Korea institute of electronic communication sciences / v.9, no.3, 2014 , pp. 279-284 More about this Journal
Abstract
This paper proposes a novel OLED pixel circuit to compensate the threshold voltage variation of p-channel low temperature polycrystalline silicon thin-film transistors (LTPS TFTs). The proposed 5-TFT OLED pixel circuit consists of 4 switching TFTs, 1 OLED driving TFT and 1 capacitor. One frame of the proposed pixel circuit is divided into initialization period, threshold voltage sensing and data programming period, data holding period and emission period. SmartSpice simulation results show that the maximum error rate of OLED current is -4.06% when the threshold voltage of driving TFT varies by ${\pm}0.25V$ and that of OLED current is 9.74% when the threshold voltage of driving TFT varies by ${\pm}0.50V$. Thus, the proposed 5T1C pixel circuit can realize uniform OLED current with high immunity to the threshold voltage variation of p-channel poly-Si TFT.
Keywords
AMOLED Display; Voltage Programming Pixel Circuit; P-channel Poly-Si TFT; Threshold Voltage Variation;
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Times Cited By KSCI : 2  (Citation Analysis)
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