Electro-Optical Sensing System Used in the Detection of Liquid Crystal Display Panels

• Main Authors: Wesley Lai, 賴瑞枝
• Other Authors: 王信福
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/36448773865476983402

碩士 === 清雲科技大學 === 電子工程所 === 98 === A new electro-optical sensing system based on the common-path heterodyne interferometry is used to determine the twist angle, pre-tilt angle, and cell gap of liquid crystal display panels. In this paper, the twist angle of a LC cell can be determined by measurement the phase difference instead of the reflectance difference. Because the measuring system is based on the common-path heterodyne interferometry, it can provide the most sensitive way to measure the twist angle of a LC cell against the air turbulence and environmental vibrations. The method has some merits, e.g., a simple setup, in real-time test and reliability, etc.