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合肥京东方光电科技有限公司 Cell分厂, 安徽 合肥 230012
高荣荣(1986-), 女, 陕西延安人, 学士, 高级工程师, 2010年于陕西科技大学获得学士学位, 主要从事TFT-LCD液晶行业产品设计与不良解析工作。E-mail gaorongrong@boe.com.cn
收稿日期:2019-05-28,
修回日期:2019-10-17,
录用日期:2019-10-17,
纸质出版日期:2020-01-05
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高荣荣, 周保全, 江桥, 等. TFT-LCD摩擦工艺ESD研究与改善[J]. 液晶与显示, 2020,35(1):48-52.
Rong-rong GAO, Bao-quan ZHOU, Qiao JIANG, et al. Research and improvement on ESD of TFT-LCD rubbing process[J]. Chinese journal of liquid crystals and displays, 2020, 35(1): 48-52.
高荣荣, 周保全, 江桥, 等. TFT-LCD摩擦工艺ESD研究与改善[J]. 液晶与显示, 2020,35(1):48-52. DOI: 10.3788/YJYXS20203501.0048.
Rong-rong GAO, Bao-quan ZHOU, Qiao JIANG, et al. Research and improvement on ESD of TFT-LCD rubbing process[J]. Chinese journal of liquid crystals and displays, 2020, 35(1): 48-52. DOI: 10.3788/YJYXS20203501.0048.
摩擦工艺ESD(Electrostatic Discharge)是TFT-LCD制程中较为常见的一种不良,以317.5 mm(12.5 in)产品为例,摩擦工艺过程中ESD发生率20%,对产品良率影响较大。文章结合实际生产对摩擦工艺ESD的原因进行理论分析与实验验证,得出摩擦工艺发生ESD的原因为TFT基板上面有悬空的大块金属,在摩擦过程中电荷积累过多容易发生ESD,ESD进一步烧毁旁边金属电路导致面板点亮时画面异常。生产过程中通过工艺管控和产品设计两方面优化改善,工艺方面通过增加湿度,涂布防静电液以及管控摩擦布寿命进行改善,设计方面通过变更悬空的大块金属为小块金属,通过工艺设计优化最终生产过程中摩擦工艺ESD发生率由20%下降到0%,大大提高了产品品质,降低了生产成本。
Electrostatic discharge(ESD) is a common defect in TFT-LCD rubbing process
For example
the ratio of ESD is 20% at 317.5 mm(12.5 in) product
it is a great influence on the yield of products. The causes of ESD in rubbing process is studied with the theoretical analysis and experiment. Experiments show that the main reason for ESD is that there are large floating metal on the TFT substrate. In rubbing process
the charge is easy to accumulate on the TFT substrate and burning down the electric circuit
so the panel is abnormal. ESD can be reduced through controlling rubbing process and optimizing design. In process
increasing humidity and coating electrostatic prevention and controlling the life time of rubbing cloth can improve ESD. In design
by changing the large floating metal into small floating metal
ESD can be improved. By optimizing the process and design
the ESD ratio is reduced from 20% to 0%
which greatly improves the panel quality and reduced the product cost.
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