小尺寸TFT-LCD GOA显示屏不良横纹的研究

高英强; 陈华斌; 李兴亮; 刘洋; 宋勇志

doi:doi:10.3788/yjyxs20193405.0501

液晶与显示, 2019, 34 (5): 501, 网络出版: 2019-09-08

小尺寸TFT-LCD GOA显示屏不良横纹的研究

Horizontal stripes defect of small size TFT-LCD GOA panel

论文大纲

高英强 ^*陈华斌李兴亮刘洋宋勇志

作者单位

北京京东方显示技术有限公司工艺开发部, 北京 100176

窄边框 ITO电化学腐蚀横纹不良 TFT-LCD TFT-LCD slim border GOA GOA electrochemical corrosion of ITO horizontal stripes defect

摘要

随着GOA(Gate On Array)技术的不断发展, 在小尺寸TFT-LCD窄边框显示屏上的应用也越来越频繁, 但是由于GOA电路的复杂性和TFT器件自身的稳定性, 以及外界温度、湿度的影响, 显示屏还存在显示不稳定的问题。本文针对小尺寸TFT-LCD GOA显示屏在高温高湿环境下产生的异常显示横纹, 进行了深入分析与改善研究。通过对GOA区域ITO过孔电阻测试、显微镜检查以及修复实验验证, 找出了不良产生的直接原因为ITO发生腐蚀, 过孔电阻增大, 导致GOA驱动信号无法上下导通。接着进一步研究ITO腐蚀发生的条件、ITO腐蚀情况、驱动信号对应关系以及腐蚀成分, 证明了ITO发生腐蚀原因为产品长期工作(200 h左右)在高温高湿环境下, 由于水汽的不断渗入, 使GOA区域ITO发生了电化学腐蚀效应。最后根据电化学腐蚀原理, 通过采用隔水性强的封框胶、增加ITO膜厚以及降低ITO电位差等措施对工艺进行了改善, 结果表明改善后的显示屏超过1 000 h, 未发生ITO腐蚀。

Abstract

With the development of GOA technology, more and more GOA unit has been applied to small size TFT-LCD product. However, the display screen has an unstable display problem which is ascribed to the complicated GOA circuit configuration, characteristics and environmental factors such as temperature and humidity. In this paper, a horizontal stripes defect caused by GOA in display was deeply researched and the improving methods were given. This unusual phenomenon was related to corrosion of ITO in the GOA unit which induced ITO resistance to be too large and eventually the drive signal can’t be output normally. Further research found that the electrochemical reaction would take place on ITO due to the continuous infiltration of water vapor through the GOA area in the high temperature and high humidity environment. Finally, according to the principle of electrochemical corrosion, the method of using water-repellent sealant was put forward, meanwhile the adjustment of increasing of the ITO’s thickness and decreasing of the potential difference prevent corrosion of ITO in GOA, which made the product’s working time increase from 200 h to 1 000 h.

参考文献

[1] 刘亮, 王向楠, 赵德友, 等．TFT-LCD移动显示窄边框技术进展[J]．液晶与显示, 2013, 28(2): 228-232．

LIU L, WANG X N, ZHAO D Y,et al. Slim border trend of TFT-LCD mobile display panel [J]. Chinese Journal of Liquid Crystals and Displays, 2013, 28(2): 228-232. (in Chinese)

[2] CHANG T T, HSUN C L, CHANG S M, et al. Gate driver on array of a display: US, 2011/0018001 Al [P]. 2011-01-27.

[3] CHANG L H. Gate driver on array structure and display: US, 786835 7 B2 [P]. 2011-01-11.

[4] 杨怀伟．GOA电路模块及其测试方法、显示面板和显示装置: 中国, 104503174A[P]．2014-12-24．

YANG H W. GOA circuit module, testing method of GOA circuit module, display panel and display device: CN, 104503174A [P]. 2014-12-24. (in Chinese)

[5] 刘世奎, 王超, 杨雪, 等．液晶显示领域之GOA技术专利分析[J]．中国发明与专利, 2013(6): 21-28．

LIU S K, WANG C, YANG X, et al. The analysis of GOA technology patent in liquid crystal display [J]. China invention & Patent, 2013(6): 21-28. (in Chinese)

[6] 张小祥, 颉芳霞, 刘正, 等．TFT-LCD产业中GOA单元不良的研究[J]．液晶与显示, 2015, 30(3): 388-392．

ZHANG X X, XIE F X, LIU Z,et al. GOA unit defect in TFT-LCD industry [J]. Chinese Journal of Liquid Crystals and Displays, 2015, 30(3): 388-392. (in Chinese)

[7] 刘同海, 梁晓桐, 高章飞, 等．双侧GOA驱动TFT-LCD的常见线不良研究[J]．电子世界, 2018(5): 186-188．

LIU T H, LIANG X T, GAO Z F,et al. The study on common line defects of bilateral GOA driven TFT-LCD [J]. Electronics World, 2018(5): 186-188. (in Chinese)

[8] 马群刚．TFT-LCD原理与设计[M]．北京: 电子工业出版社, 2011．

MA Q G. Principle and Design of TFT-LCD [M]. Beijing: Publishing House of Electronics Industry, 2011. (in Chinese)

[9] 王辉, 缴春雷, 王虹．COG液晶显示模块电极腐蚀问题研究[J]．光电子技术, 2006, 26(2): 127-128, 132．

WANG H, JIAO C L, WANG H. Study on the eroded electrode of COG LCM [J]. Optoelectronic Technology, 2006, 26(2): 127-128, 132. (in Chinese)

[10] 王浩, 钟澄, 蒋程捷, 等．ITO在NaOH溶液中阳极与阴极极化过程的电化学行为[J]．物理化学学报, 2009, 25(5): 835-839．

WANG H, ZHONG C, JIANG C J,et al. Electrochemical behavior of ITO films during anodic and cathodic polarization in sodium hydroxide solutions [J]. Acta Physico-Chimica Sinica, 2009, 25(5): 835-839. (in Chinese)

[11] 曹楚南．腐蚀电化学原理[M]．3版．北京: 化学工业出版社, 2008．

CAO C N.Principles of Electrochemistry of Corrosion [M]. 3rd ed. Beijing: Chemical Industry Press, 2008. (in Chinese)

[12] 王巍强．COG工艺的LCD模块电极腐蚀的控制[J]．液晶与显示, 2006, 21(6): 696-699．

WANG W Q. Controlling electrode corresion of LCD module in COG process [J]. Chinese Journal of Liquid Crystals and Displays, 2006, 21(6): 696-699. (in Chinese)

高英强, 陈华斌, 李兴亮, 刘洋, 宋勇志. 小尺寸TFT-LCD GOA显示屏不良横纹的研究[J]. 液晶与显示, 2019, 34(5): 501. GAO Ying-qiang, CHEN Hua-bin, LI Xing-liang, LIU Yang, SONG Yong-zhi. Horizontal stripes defect of small size TFT-LCD GOA panel[J]. Chinese Journal of Liquid Crystals and Displays, 2019, 34(5): 501.

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