A LTPS-TFT pixel circuit for active matrix organic light emitting diode based on improved current mirror |
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| Affiliation: | 1. School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi 16419, Republic of Korea;2. Samsung Display Co., Ltd., Yongin, Gyeonggi 17113, Republic of Korea;3. Department of Electronic Engineering, Konkuk University, Seoul 05029, Republic of Korea |
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| Abstract: | In this paper, a voltage-driving and current compensation method for active matrix organic light emitting diode (AMOLED) displays is proposed. An improved current mirror is introduced into the pixel circuit to overcome the channel length modulation effect of TFTs. The SPICE simulation results show that the proposed pixel circuit not only effectively compensates for non-idealities related with deviations of μ and VT in TFTs, the OLED degradation, but also offers a less setting time and guarantees a good liner relationship between VDATA and IOLED. |
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| Keywords: | Active matrix organic light emitting diode (AMOLED) Low-temperature poly-silicon thin-film transistor (LTPS-TFT) Current programmed pixel circuit (CPPC) Channel length modulation effect |
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