高温环境下液晶显示器件偏光特性的测试方法

A Measurement Method of LCD Polarization Characteristics in High-Temperature Environment

温度会改变液晶材料偏光特性,液晶材料偏光特性的改变会直接影响液晶显示器件的显示性能,因此获得高温下液晶器件的偏光特性就可以预测其在高温环境中使用时显示特性的变化。提出一种适用于高温环境下液晶显示器件偏光特性的测试方法:首先将背光式LED和偏振片放入高低温试验箱中进行高温测试,利用面成像仪测量线偏光通过高低温试验箱玻璃门后的偏振态,以此获得玻璃门的偏振特性;然后将液晶器件放入高低温试验箱,测试得到通过玻璃门后的Stokes矢量,用玻璃门的温度-偏振特性进行补偿后,即可得到液晶显示器件在高温状态下的温度-偏光特性。

Temperature can change the polarization characteristics of liquid crystal materials, and the change will directly affect the display performance of Liquid Crystal Display( LCD). Therefore, if we obtain the LCD polarization characteristics in high-temperature environment, the changes of its display characteristics when it works in such environment are predictable. A method is proposed for the measurement of LCD polarization characteristics in high-temperature environment. First, a backlight LED and a polarizing film are placed in a temperature test chamber to simulate a high-temperature environment. The polarization state of the linearly polarized beam after passing the glass door of the chamber is measured by using a surface imager, so as to obtain the polarizing characteristics of the glass door. Then, the LCD is placed in the test chamber. The temperature and polarization characteristics of the LCD in the high-temperature state are obtained via the Stokes vector that is compensated by the temperature and polarization characteristics of the glass door.