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昆山龙腾光电有限公司, 江苏 昆山 215301
[ "顾小祥(1987-), 男, 江苏盐城人, 学士, 工程师, 2009年于扬州大学获得学士学位, 主要从事TFT-LCD显示技术方面的研究。E-mail:Coolgu@ivo.com.cn" ]
收稿日期:2018-04-05,
录用日期:2018-12-20,
纸质出版日期:2019-02-05
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顾小祥, 杨丽, 曾龙. TFT-LCD制程对低频横纹色差的影响及研究[J]. 液晶与显示, 2019,34(2):160-168.
Xiao-xiang GU, Li YANG, Long ZENG. Influence and research of TFT-LCD process on low frequency striped Mura[J]. Chinese journal of liquid crystals and displays, 2019, 34(2): 160-168.
顾小祥, 杨丽, 曾龙. TFT-LCD制程对低频横纹色差的影响及研究[J]. 液晶与显示, 2019,34(2):160-168. DOI: 10.3788/YJYXS20193402.0160.
Xiao-xiang GU, Li YANG, Long ZENG. Influence and research of TFT-LCD process on low frequency striped Mura[J]. Chinese journal of liquid crystals and displays, 2019, 34(2): 160-168. DOI: 10.3788/YJYXS20193402.0160.
LC配向的均一性在LCD中是必不可少的,光配向制程是通过施加紫外偏振光照射在IPS(In-Plane Switch)LCD中形成液晶配向沟槽的一种技术,然而紫外光照射的同时会损伤TFT器件,使非晶硅层产生光生载流子,电子发生迁移,导致TFT漏电流从而影响图像品质,产生横纹色差。在低频时,栅极开关时间延长,相邻扫描线之间容易发生混充电现象,部分充电截止的像素重新充电,从而使横纹色差变严重。本文从制程和电性调整方面对低频横纹色差进行了研究,结果表明:(1)紫外光照射后进行烘烤,可以有效降低漏电流,高温度(240℃)+长时间(4 200 s)改善低频横纹色差效果佳(比例:0.00%);(2)延长Out Enable(4.8
μ
s)+降低
V
gh
(18 V)+提高GOA(Gate On Array)电路中电压
V
SS_Q
(-7.5 V),改善低频横纹色差效果佳(比例:0.00%)。
Uniform LC alignment is indispensable in LCD
and photo-alignment process is one technology to form liquid crystal alignment grooves in IPS (In-Plane Switch) LCD by applying polarized UV irradiation. However
UV exposure treatment will simultaneously damage TFT device that produces photo generated electrons and electronic migration on amorphous silicon layer. The TFT leakage current will lead to poor image quality. At low frequency
mixed-charge phenomenon is easily occurred between neighboring scan line due to longer gate switching time
parts of off-pixels re-charged then enhance striped Mura appearance. In this paper
we discuss the impacts on low frequency Mura from process and electrical property. The results show that:(1) Applying thermal treatment after UV irradiation can effectively reduce the leakage current
high temperature (240℃)+ long time(4 200 s) can improve low frequency Mura(Ratio:0.00%); (2) Extending the out enable time (4.8
μ
s)+reducing
V
gh
(18 V)+increasing GOA circuit static operating point voltage
V
SS_Q
(-7.5 V) can improve low frequency Mura(Ratio:0.00%).
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CHEN M D, YANG L, LIU Z M, et al . Effects of photo-alignment process parameters on pre-tilt angle and photoelectric properties[J]. Chinese Journal of Liquid Crystals and Displays , 2017, 32(9):708-713. (in Chinese)
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