Cold test and cyclic damp heat test of plastic substrate based displays

The plastic substrate based displays have attracted a lot of interest in recent years because of their potential applications in portable electronic devices. Many of them have high brightness, high contrast, and large angle of view, with the flexibility for accommodating different form factors. However, their reliability in practical applications has not been systematically studied. For many plastic materials, the temperature and humidity reliability are among the biggest concerns. This paper presents an experimental study of the plastic substrate based liquid crystal display with the focus on its reliability under varying temperature and humidity conditions. In this study, the cold test and the cyclic damp heat tests were conducted with visual inspections and electro-optical properties measurement during each test procedure. These provide a solid foundation for further studies on the reliability of displays based on plastic substrate technology in practical applications.