Study on the measurement method of birefringence of liquid crystals cells

• Main Authors: SUE, TSUNG-HAO, 蘇琮皓
• Other Authors: WU, JIN-JEI
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/c3cxxt

碩士 === 國立臺北科技大學 === 光電工程系 === 107 === This study used several methods to measure the optical path length and birefringence of voltage-driven liquid crystal cells, including Zeeman lasers, lock-in amplifiers, and interference spectroscopy. After comparing three different measurement methods, we found that the optical path variation of the interference spectrum is significantly different from that of the Zeeman laser and the lock-in amplifier. The reason is due to the transparent conductive film (ITO) in the liquid crystal cell and the alignment film. To get the correct value, it is necessary to modify the measured result by an adjustment parameter. Finally, the blue phase liquid crystal cell is measured by interference spectrum, and the measured result is multiplied by the above-mentioned adjustment parameter to obtain the optical path variation and birefringence of the blue phase liquid crystal under voltage driving.