Study on ESD Protection for IPS Liquid Crystals

• Main Authors: CHIH-YUAN CHANG, 張志遠
• Other Authors: Bau-Jy Liang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/99024248921427015391

碩士 === 逢甲大學 === 電機工程所 === 97 === The problem has been studied for a long time that the electro-static has an influence of IC destruction or image sticking on LCD, especially the TFT-LCD which has been widely used now. Because its resistance from LC is higher, therefore, it’s difficult to remove the induced charges when it suffers from high anti-static voltage. Consequently, the time of image sticking will be very essential. This study will focus on doping a very small amount of nano-ITO doping into TFT-IPS LC, understand the impact on anti-ESD of LC cell ,and measure the characteristics of optics and electricity under the normal operating circumstance will be investigated. Through the experimental results, we could understand that doped nano-particles help removing the induced charges and enhancing the liquid crystal cell anti-ESD ability. But it has no influence on the optical and electrical properties of LC cells under the normal operating conditions. In comparison with TFT-TN LC, the high-resistance LC with doped nano-particles have similar effect about anti-ESD improvement. In addition, we also focus on the observation of the precipitation properties of nano-ITO. Through the intensive investigation, we found that the larger nano-particles are blocked near the injection hole, only the smaller particles would be transferred in the LC cell and without any precipitation.