Simulation of Amorphous-InGaZnO Thin Film Transistors Driven OLED Pixel Circuit

ZHANG Li; XU Ling; DONG Cheng-yuan

doi:10.3788/fgxb20143510.1264

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Simulation of Amorphous-InGaZnO Thin Film Transistors Driven OLED Pixel Circuit

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- Simulation of Amorphous-InGaZnO Thin Film Transistors Driven OLED Pixel Circuit
- Chinese Journal of Luminescence Vol. 35, Issue 10, Pages: 1264-1268(2014)
- 作者机构：
  
  上海交通大学电子信息与电气工程学院电子工程系上海,200240
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20143510.1264
  CLC： TN321+.5
- Received：30 May 2014，
  
  Revised：25 July 2014，
  
  Published：03 October 2014
- 稿件说明：
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张丽, 许玲, 董承远. 非晶InGaZnO薄膜晶体管驱动OLED像素电路的仿真研究[J]. 发光学报, 2014,35(10): 1264-1268

ZHANG Li, XU Ling, DONG Cheng-yuan. Simulation of Amorphous-InGaZnO Thin Film Transistors Driven OLED Pixel Circuit[J]. Chinese Journal of Luminescence, 2014,35(10): 1264-1268
张丽, 许玲, 董承远. 非晶InGaZnO薄膜晶体管驱动OLED像素电路的仿真研究[J]. 发光学报, 2014,35(10): 1264-1268 DOI： 10.3788/fgxb20143510.1264.

ZHANG Li, XU Ling, DONG Cheng-yuan. Simulation of Amorphous-InGaZnO Thin Film Transistors Driven OLED Pixel Circuit[J]. Chinese Journal of Luminescence, 2014,35(10): 1264-1268 DOI： 10.3788/fgxb20143510.1264.

摘要

为解决非晶InGaZnO薄膜晶体管（a-IGZO TFT）因其阈值电压漂移而导致的OLED电流衰减的问题，本文研究了基于a-IGZO TFT的有源矩阵有机发光显示（AMOLED）像素电路的阈值电压补偿问题。利用实验室制备的a-IGZO TFT器件进行参数提取后建立的SPICE仿真模型并进行仿真计算，对电压驱动型2T1C和4T1C的像素电路进行稳定性的比较研究，证明了4T1C电路对阈值漂移有非常好的补偿效果，并指出增加存储电容值和驱动TFT的宽长比可有效提高OLED电流的保持能力。

Abstract

The problem of OLED current decrease with threshold voltage (

) shift of a-IGZO TFTs still remains to be solved. In this paper

we continued to investigate the compensation effect for

shift in AMOLED pixel circuits based on a-IGZO TFTs. With the device models extracted from the experimental data on a-IGZO TFTs prepared in our lab

two kinds of pixel circuits

i.e

2T1C and 4T1C were comparatively studied. The results show that 4T1C pixel circuit has excellent compensation effect for bias-stress instability

and the increasing storage capacitor and

of driving TFTs might lead to better holding capacity of this circuit.

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Keywords

references

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