Voltage Driving Scheme Using Three TFTs and One Capacitor for Active-Matrix Organic Light-Emitting Diode Pixel Circuits
Voltage Driving Scheme Using Three TFTs and One Capacitor for Active-Matrix Organic Light-Emitting Diode Pixel Circuits
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DOI：
10.1109/jdt.2012.2209110
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发表时间：
2012-09
影响因子：
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通讯作者：
Chih-Lung Lin;C. Hung;W. Chang;M. Cheng;P. Kuo;Yu-Cheng Chen
中科院分区：
文献类型：
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作者：
Chih-Lung Lin;C. Hung;W. Chang;M. Cheng;P. Kuo;Yu-Cheng Chen
本文提出了一种基于低温多晶硅薄膜晶体管（LTPS TFT）的有源矩阵有机发光二极管（AMOLED）像素电路。所提出的电路，包括一个驱动TFT和两个开关TFT，这是所有的p型，可以成功地补偿不仅在TFT阈值电压的变化，但也电流电阻（IR）的电压降在电源线。利用集成电路仿真程序HSPICE验证了阵列结构像素电路的功能和有机发光二极管（OLED）电流的均匀性。仿真结果表明，在整个测试数据电压范围内（-4.5 ~-2.5V），当驱动TFT阈值电压在-0.5 ~+0.5V之间变化时，该电路的OLED电流相对误差小于1.2%。
This work presents a new active-matrix organic light-emitting diode (AMOLED) pixel circuit with a novel driving scheme that is based on low-temperature polycrystalline-silicon thin film transistors (LTPS TFTs). The proposed circuit that consists of one driving TFT and two switching TFTs, which are all p-type, can successfully compensate for not only variations in the TFT threshold voltage but also the current-resistance (IR) voltage drop in the power line. The functionality of the pixel circuit for the array structure and the uniformity of organic light-emitting diode (OLED) current are verified using H-Simulation Program with Integrated Circuit Emphasis (HSPICE). According to the results of a simulation, over the entire range of tested data voltages (-4.5 to -2.5 V), the relative errors of the OLED current of the proposed circuit are below 1.2% when the driving TFT threshold voltage varies from -0.5 to +0.5 V.