IZO TFT驱动器：实现柔性AMOLED显示屏的高可靠集成

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本文主要探讨了"通过IZO TFT集成在柔性AMOLED显示屏中的高可靠性栅极驱动器"这一创新技术的研究。该研究发表于《电子器件交易》(IEEETRANSACTIONSONELECTRONDEVICES)2017年5月第64卷第5期，作者包括Wei-Jing Wu（IEEE会员）、Li-Rong Zhang、Zhi-Ping Xu、Lei Zhou等人。他们提出了一种新颖的栅极驱动器设计，利用IZO薄膜晶体管(TFTs)与蚀刻停止层结构集成在聚酰亚胺基板上。这种集成的高可靠性栅极驱动器具有多方面的优势。首先，电路设计简单，减少了复杂度，使得驱动器的实现更为直观。其次，它具备全摆幅输出特性，这意味着它可以提供更广泛的电压范围，这对于显示屏的性能优化至关重要。此外，低功耗也是该驱动器的一大亮点，有助于延长设备的电池寿命和提高能效。研究的核心内容是将这种新型驱动器成功地整合到一款分辨率为200(RGB)×600的柔性主动矩阵有机发光显示屏幕上，采用了传统的2T1C像素电路，带有底部发射结构。结果显示，即使在高达600级的驱动阶段，输出信号仍然保持无畸变和良好的噪声抑制特性，表明其信号传输的稳定性和清晰度非常高。进一步的测试表明，该驱动器在720小时的高温测试下仍能保持稳定的电压输出，显示出卓越的稳定性。更重要的是，经过10000次弯曲操作后，柔性面板依然能正常工作，验证了其在实际应用中的高可靠性。这项研究不仅提升了AMOLED显示屏的性能，如图像质量、响应速度和耐用性，而且展示了IZO TFT在栅极驱动器中的潜力，对于推动柔性电子设备的发展具有重要意义。未来，随着这种技术的不断优化和普及，我们有理由期待在更多类型的可穿戴设备和折叠屏设备中看到它的身影。

IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 64, NO. 5, MAY 2017 1991

A High-Reliability Gate Driver Integrated in

Flexible AMOLED Display by IZO TFTs

Wei-Jing Wu,

Member, IEEE

, Li-Rong Zhang, Zhi-Ping Xu, Lei Zhou, Hao Tao,

Jian-Hua Zou, Miao Xu, Lei Wang, and Jun-Biao Peng

Abstract

— This paper presents a new gate driver

integrated by IZO thin-ﬁlm transistors (TFTs) with the etch

stop layer structure on the polyimide substrate, which con-

sists of nine TFTs and two capacitors. There are several

advantages for the proposed gate driver, such as simple

circuitry, full-swing output, low power, and good reliability.

The proposed gate driver has been successfully integrated

in a ﬂexible active matrix organic light emitting display with

the resolution of 200 (RGB) × 600, in which the conventional

2T1C pixel circuit with bottom-emission structure is used.

It is shown that there are no distortion and good noise-

suppressed characteristics for the output signals even up

to 600 stages. In addition, the proposed gate driver has a

good stability, since no voltage ﬂuctuation occurs under

720-h test. Moreover, the ﬂexible panel works well after a

10000 times repetitive bending performed on a test bench,

which is mainly composed of a programmed logic controller

and dc motor. During the bending test, the minimum curva-

ture radius of ﬂexible panel can reach to be about 5 mm.

IndexTerms

— Flexibleactivematrixorganiclightemitting

display (AMOLED), gate driver, IZO thin-ﬁlm transistors

(TFTs).

I. INTRODUCTION

LEXIBLE displays on a plastic substrate have received

much attention due to their superior characteristics, such

as thinner thickness, lighter weight, and bendability [1], [2].

The ﬂexible active matrix organic light emitting dis-

play (AMOLED) is a very promising display technology

due to its all solid-state process [3]–[7]. To realize ﬂexi-

ble AMOLED displays, it is mainly required to fabricate a

uniform and stable thin-ﬁlm transistors (TFTs) backplane on

the ﬂexible substrate. Low-temperature polycrystalline-silicon

Manuscript received December 15, 2016; accepted

December 15, 2016. Date of publication January 4, 2017; date of

current version April 19, 2017. This work was supported in part by

the 973 Program under Grant 2015CB655004 founded by the Ministry

of Science and Technology, in part by the National Natural Science

Foundation of China under Grant 61574062 and Grant 61574061,

and in part by the Science and Technology Program of Guangdong

Province under Grant 2016B090906002, Grant 2016B090907001,

Grant 2015B090914003, and Grant 2015B090915001. The review of

this paper was arranged by Editor M. M. Hussain.

(Corresponding

author: Wei-Jing Wu.)

W.-J. Wu, Z.-P. Xu, M. Xu, L. Wang, and J.-B. Peng are with the State

Key Laboratory of Luminescent Materials and Devices, South China Uni-

versity of Technology, Guangzhou 510640, China (wuwj@scut.edu.cn).

L.-R. Zhang, L. Zhou, H. Tao, and J.-H. Zou are with Guangzhou New

Vision Opto-Electronic Technology Co., Ltd., Guangzhou 510530, China.

Color versions of one or more of the ﬁgures in this paper are available

online at http://ieeexplore.ieee.org.

Digital Object Identiﬁer 10.1109/TED.2016.2641448

Fig. 1. (a) Display panel with source driver IC and gate driver IC.

(b) Flexible display panel with the integrated gate driver.

TFTs are widely used to drive OLED devices due to high

ﬁeld-effect mobility [>50 cm

/(V · S)] and stable electrical

performance [8], [9]. However, there still exist the drawbacks

of poor uniformity over a large area and quite high process

temperature (400 °C–500 °C) during silicon crystallization.

In the recent years, metal oxide (MO) TFTs have attracted

considerable interest due to high mobility, low fabrication

temperature, good uniformity, good process compatibility with

a-Si:H TFTs, and the compatibility with transparent or ﬂexible

applications [10]–[14]. Discrete ﬂexible MO TFTs and their

simple circuits have been reported by several groups [15]–[20].

For active matrix displays, such as AMOLED or AMLCD,

source driver in the column direction and gate driver in the

row direction are needed. Conventionally, the source driver IC

and gate driver IC, packaged with tape automated bond or chip

on glass, are boned to display panel, as shown in Fig. 1(a).For

ﬂexible displays, ICs are easy to strip from the plastic substrate

under the process of bending. Along with the development of

TFT technology, the gate driver is being tried to be integrated

on the same ﬂexible display panel. However, source driver is

hard to be integrated by TFTs due to its complexity. Hence, the

ﬂexible display panel can be freely bended in the row direction

with the integration of gate driver, as shown in Fig. 1(b).

As a result, integrating the gate driver in the ﬂexible dis-

play can not only enhance the reliability but also lower the

fabrication cost. It is common that the gate driver is integrated

See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.

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