基于数据线控制发光的A-IGZO薄膜晶体管集成AMOLED像素电路

王兰兰; 鲁力; 于天宝; 廖聪维; 黄生祥; 邓联文

doi:doi:10.3788/fgxb20183911.1549

发光学报, 2018, 39 (11): 1549, 网络出版: 2018-12-25

基于数据线控制发光的A-IGZO薄膜晶体管集成AMOLED像素电路

A-IGZO Thin-film Transistors Integrated AMOLED Pixel Circuit with Data Line Controlled Light-emitting

论文大纲

王兰兰 ^*鲁力于天宝廖聪维黄生祥邓联文

作者单位

中南大学物理与电子学院, 湖南长沙 410083

有源矩阵有机发光二极管铟镓锌氧化物薄膜晶体管阈值电压像素电路 AMOLED IGZO-TFTs threshold voltage pixel circuit

摘要

本文提出了一种采用铟镓锌氧化物(IGZO)薄膜晶体管(TFT)的有源矩阵有机发光二极管(AMOLED)显示器的新型补偿结构。它利用数据线关闭电源和驱动晶体管之间的控制晶体管, 以抑制编程期间的泄漏电流。在所提出的电路和传统电路之间进行电路性能的比较, 表明所提出的像素电路可以有效地补偿驱动晶体管的阈值电压偏移和迁移率变化。当VTH飘移2 V和μ增加30％时, IOLED误差率可以分别降低至小于5％和9％。此外, 由于使用同时驱动方法, 因此所需的最小编程时间可以被详细推导出来。所提出的像素电路的编程能力和机制已经通过FPGA平台和离散的场效应器件所证实。尽管所提出的像素电路具有非常简单的驱动结构, 但它能够提高补偿精度。

Abstract

A new compensation structure for active matrix organic light emitting diode (AMOLED) display using indium-gallium-zinc-oxide (IGZO) thin film transistors (TFTs) was proposed. It featured adopting the data line to turn off controlling transistor between the power supply and the driving transistor to suppress leakage current during the programming time. Comparison of circuit performances was carried out between the proposed circuit and the conventional ones. It is proven that the proposed pixel circuit can efficiently compensate threshold voltage shift and mobility variations of the driving transistor. And IOLED discrepancy can be decreased to be less than 5% and 9%, with VTH shift of 2 V and mobility increasing of 30%, respectively. Furthermore, as simultaneous driving method is used, the minimum required programming time is derived in details. The programming ability and mechanism of the proposed pixel circuit are well proven by discrete field-effect devices using FPGA platform. Although the proposed pixel circuit has much simplified driving structure, it has improved compensation accuracy.

参考文献

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王兰兰, 鲁力, 于天宝, 廖聪维, 黄生祥, 邓联文. 基于数据线控制发光的A-IGZO薄膜晶体管集成AMOLED像素电路[J]. 发光学报, 2018, 39(11): 1549. WANG Lan-lan, LU Li, YU Tian-bao, LIAO Cong-wei, HUANG Sheng-xiang, DENG Lian-wen. A-IGZO Thin-film Transistors Integrated AMOLED Pixel Circuit with Data Line Controlled Light-emitting[J]. Chinese Journal of Luminescence, 2018, 39(11): 1549.

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