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1. 吉林大学通信工程学院,吉林 长春,130025
2. 吉林大学电子工程学院,吉林 长春,130023
纸质出版日期:2002-9-20,
收稿日期:2002-1-24,
修回日期:2002-6-10,
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司玉娟, 李春星, 刘式墉. 有源OLED两管TFT像素驱动电路的仿真研究[J]. 发光学报, 2002,23(5): 518-522
SI Yu-juan, LI Chun-xing, LIU Shi-yong. Two-TFT Pixel Electrode Circuit Simulation Research for Active Matrix OLED[J]. Chinese Journal of Luminescence, 2002,23(5): 518-522
利用AIM-Spice对有源OLED显示器的两管TFT像素驱动电路进行了仿真分析
结果表明合理选择电路参数
能够保证OLED显示器的亮度要求
并在一帧时间里保持恒流
改变数据电压能够调整OLED显示器的灰度级;给出了电路中各类参数变化对电路性能的影响;在此基础上
得到了两管TFT像素驱动电路各参数的选择参考值。为OLED显示器像素驱动电路结构的设计、参数选取、性能分析以及版图设计等提供了依据。
Two-TFT pixel driving circuit was simulated and analyzed for Active Matrix OLED using AIM Spice in this paper.From the simulation results
the influences of the driving transistor T
2
W/L
ratios on the OLED current were shown.For a typical OLED emission efficiency
and a known pixel area
a current level is needed to achieve the pixel brightness.By the simulation results
reasonable T
2
W/L
ratios can be obtained.The simulation results also showed that the OLED grayscale could be adjusted by changing the data voltage.On the other hand
the source voltage should be high enough to ensure the T
2
operates the saturation state.Further more
the two-TFT pixel electrode circuit transient characteristic was simulated.The impact of the T
1
W/L
ratios and storage capacitor on output characteristic was discussed.The lower size capacitor will reduce the OLED current during the pixel electrode OFF period.And too large capacitor will deduce a large charge time constant
which impacts on the respond speed and brightness of OLED.The larger T
1
W/L
ratios will also result in the drop of the OLED current during the pixel electrode OFF period.So they need to be carefully selected.From the transient characteristic of the influences of the value of scan pulse voltage on output current
it is clear that the lower scan voltage value will result in the OLED current is not proportional to data voltage.Thus the OLED brightness cannot follow the variation of the data voltage.The increasing of scan voltage value will solve the above problem. Form the temperature characteristic
the two-TFT pixel driving circuit cannot overcome the effect on OLED current because of the shift of threshold of the driving TFT due to the manufacturing variations and the circuit aging. The simulation results indicate that if the parameters are chosen properly
driving circuit can ensure the OLED brightness requirement and the constant output current in a frame time
and the grayscale can be adjusted by changing data voltage.Simulation results showed the various parameter effect on the circuit performance.On this basis
we obtain the more reasonable parameter value about two-TFT pixel electrode circuit.Those analyses supply base for driving circuit design
parameter choice
performance analyses and layout design for Active Matrix OLED.
TFT像素驱动电路有源OLEDAIM-Spice仿真分析
TFT pixel driving circuitactive matrix OLEDAIM-Spicesimulation analysis
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